/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2019 Intel Corporation
 */

#include <linux/vgaarb.h>

#include "display/intel_crt.h"
#include "display/intel_dp.h"

#include "i915_drv.h"
#include "i915_irq.h"
#include "intel_cdclk.h"
#include "intel_combo_phy.h"
#include "intel_csr.h"
#include "intel_dpio_phy.h"
#include "intel_drv.h"
#include "intel_hotplug.h"
#include "intel_sideband.h"

bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
                                         enum i915_power_well_id power_well_id);

const char *
intel_display_power_domain_str(enum intel_display_power_domain domain)
{
        switch (domain) {
        case POWER_DOMAIN_DISPLAY_CORE:
                return "DISPLAY_CORE";
        case POWER_DOMAIN_PIPE_A:
                return "PIPE_A";
        case POWER_DOMAIN_PIPE_B:
                return "PIPE_B";
        case POWER_DOMAIN_PIPE_C:
                return "PIPE_C";
        case POWER_DOMAIN_PIPE_A_PANEL_FITTER:
                return "PIPE_A_PANEL_FITTER";
        case POWER_DOMAIN_PIPE_B_PANEL_FITTER:
                return "PIPE_B_PANEL_FITTER";
        case POWER_DOMAIN_PIPE_C_PANEL_FITTER:
                return "PIPE_C_PANEL_FITTER";
        case POWER_DOMAIN_TRANSCODER_A:
                return "TRANSCODER_A";
        case POWER_DOMAIN_TRANSCODER_B:
                return "TRANSCODER_B";
        case POWER_DOMAIN_TRANSCODER_C:
                return "TRANSCODER_C";
        case POWER_DOMAIN_TRANSCODER_EDP:
                return "TRANSCODER_EDP";
        case POWER_DOMAIN_TRANSCODER_EDP_VDSC:
                return "TRANSCODER_EDP_VDSC";
        case POWER_DOMAIN_TRANSCODER_DSI_A:
                return "TRANSCODER_DSI_A";
        case POWER_DOMAIN_TRANSCODER_DSI_C:
                return "TRANSCODER_DSI_C";
        case POWER_DOMAIN_PORT_DDI_A_LANES:
                return "PORT_DDI_A_LANES";
        case POWER_DOMAIN_PORT_DDI_B_LANES:
                return "PORT_DDI_B_LANES";
        case POWER_DOMAIN_PORT_DDI_C_LANES:
                return "PORT_DDI_C_LANES";
        case POWER_DOMAIN_PORT_DDI_D_LANES:
                return "PORT_DDI_D_LANES";
        case POWER_DOMAIN_PORT_DDI_E_LANES:
                return "PORT_DDI_E_LANES";
        case POWER_DOMAIN_PORT_DDI_F_LANES:
                return "PORT_DDI_F_LANES";
        case POWER_DOMAIN_PORT_DDI_A_IO:
                return "PORT_DDI_A_IO";
        case POWER_DOMAIN_PORT_DDI_B_IO:
                return "PORT_DDI_B_IO";
        case POWER_DOMAIN_PORT_DDI_C_IO:
                return "PORT_DDI_C_IO";
        case POWER_DOMAIN_PORT_DDI_D_IO:
                return "PORT_DDI_D_IO";
        case POWER_DOMAIN_PORT_DDI_E_IO:
                return "PORT_DDI_E_IO";
        case POWER_DOMAIN_PORT_DDI_F_IO:
                return "PORT_DDI_F_IO";
        case POWER_DOMAIN_PORT_DSI:
                return "PORT_DSI";
        case POWER_DOMAIN_PORT_CRT:
                return "PORT_CRT";
        case POWER_DOMAIN_PORT_OTHER:
                return "PORT_OTHER";
        case POWER_DOMAIN_VGA:
                return "VGA";
        case POWER_DOMAIN_AUDIO:
                return "AUDIO";
        case POWER_DOMAIN_AUX_A:
                return "AUX_A";
        case POWER_DOMAIN_AUX_B:
                return "AUX_B";
        case POWER_DOMAIN_AUX_C:
                return "AUX_C";
        case POWER_DOMAIN_AUX_D:
                return "AUX_D";
        case POWER_DOMAIN_AUX_E:
                return "AUX_E";
        case POWER_DOMAIN_AUX_F:
                return "AUX_F";
        case POWER_DOMAIN_AUX_IO_A:
                return "AUX_IO_A";
        case POWER_DOMAIN_AUX_TBT1:
                return "AUX_TBT1";
        case POWER_DOMAIN_AUX_TBT2:
                return "AUX_TBT2";
        case POWER_DOMAIN_AUX_TBT3:
                return "AUX_TBT3";
        case POWER_DOMAIN_AUX_TBT4:
                return "AUX_TBT4";
        case POWER_DOMAIN_GMBUS:
                return "GMBUS";
        case POWER_DOMAIN_INIT:
                return "INIT";
        case POWER_DOMAIN_MODESET:
                return "MODESET";
        case POWER_DOMAIN_GT_IRQ:
                return "GT_IRQ";
        default:
                MISSING_CASE(domain);
                return "?";
        }
}

static void intel_power_well_enable(struct drm_i915_private *dev_priv,
                                    struct i915_power_well *power_well)
{
        DRM_DEBUG_KMS("enabling %s\n", power_well->desc->name);
        power_well->desc->ops->enable(dev_priv, power_well);
        power_well->hw_enabled = true;
}

static void intel_power_well_disable(struct drm_i915_private *dev_priv,
                                     struct i915_power_well *power_well)
{
        DRM_DEBUG_KMS("disabling %s\n", power_well->desc->name);
        power_well->hw_enabled = false;
        power_well->desc->ops->disable(dev_priv, power_well);
}

static void intel_power_well_get(struct drm_i915_private *dev_priv,
                                 struct i915_power_well *power_well)
{
        if (!power_well->count++)
                intel_power_well_enable(dev_priv, power_well);
}

static void intel_power_well_put(struct drm_i915_private *dev_priv,
                                 struct i915_power_well *power_well)
{
        WARN(!power_well->count, "Use count on power well %s is already zero",
             power_well->desc->name);

        if (!--power_well->count)
                intel_power_well_disable(dev_priv, power_well);
}

/**
 * __intel_display_power_is_enabled - unlocked check for a power domain
 * @dev_priv: i915 device instance
 * @domain: power domain to check
 *
 * This is the unlocked version of intel_display_power_is_enabled() and should
 * only be used from error capture and recovery code where deadlocks are
 * possible.
 *
 * Returns:
 * True when the power domain is enabled, false otherwise.
 */
bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
                                      enum intel_display_power_domain domain)
{
        struct i915_power_well *power_well;
        bool is_enabled;

        if (dev_priv->runtime_pm.suspended)
                return false;

        is_enabled = true;

        for_each_power_domain_well_reverse(dev_priv, power_well, BIT_ULL(domain)) {
                if (power_well->desc->always_on)
                        continue;

                if (!power_well->hw_enabled) {
                        is_enabled = false;
                        break;
                }
        }

        return is_enabled;
}

/**
 * intel_display_power_is_enabled - check for a power domain
 * @dev_priv: i915 device instance
 * @domain: power domain to check
 *
 * This function can be used to check the hw power domain state. It is mostly
 * used in hardware state readout functions. Everywhere else code should rely
 * upon explicit power domain reference counting to ensure that the hardware
 * block is powered up before accessing it.
 *
 * Callers must hold the relevant modesetting locks to ensure that concurrent
 * threads can't disable the power well while the caller tries to read a few
 * registers.
 *
 * Returns:
 * True when the power domain is enabled, false otherwise.
 */
bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
                                    enum intel_display_power_domain domain)
{
        struct i915_power_domains *power_domains;
        bool ret;

        power_domains = &dev_priv->power_domains;

        mutex_lock(&power_domains->lock);
        ret = __intel_display_power_is_enabled(dev_priv, domain);
        mutex_unlock(&power_domains->lock);

        return ret;
}

/*
 * Starting with Haswell, we have a "Power Down Well" that can be turned off
 * when not needed anymore. We have 4 registers that can request the power well
 * to be enabled, and it will only be disabled if none of the registers is
 * requesting it to be enabled.
 */
static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv,
                                       u8 irq_pipe_mask, bool has_vga)
{
        struct pci_dev *pdev = dev_priv->drm.pdev;

        /*
         * After we re-enable the power well, if we touch VGA register 0x3d5
         * we'll get unclaimed register interrupts. This stops after we write
         * anything to the VGA MSR register. The vgacon module uses this
         * register all the time, so if we unbind our driver and, as a
         * consequence, bind vgacon, we'll get stuck in an infinite loop at
         * console_unlock(). So make here we touch the VGA MSR register, making
         * sure vgacon can keep working normally without triggering interrupts
         * and error messages.
         */
        if (has_vga) {
                vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
                outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
                vga_put(pdev, VGA_RSRC_LEGACY_IO);
        }

        if (irq_pipe_mask)
                gen8_irq_power_well_post_enable(dev_priv, irq_pipe_mask);
}

static void hsw_power_well_pre_disable(struct drm_i915_private *dev_priv,
                                       u8 irq_pipe_mask)
{
        if (irq_pipe_mask)
                gen8_irq_power_well_pre_disable(dev_priv, irq_pipe_mask);
}

static void hsw_wait_for_power_well_enable(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
{
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        int pw_idx = power_well->desc->hsw.idx;

        /* Timeout for PW1:10 us, AUX:not specified, other PWs:20 us. */
        WARN_ON(intel_wait_for_register(&dev_priv->uncore,
                                        regs->driver,
                                        HSW_PWR_WELL_CTL_STATE(pw_idx),
                                        HSW_PWR_WELL_CTL_STATE(pw_idx),
                                        1));
}

static u32 hsw_power_well_requesters(struct drm_i915_private *dev_priv,
                                     const struct i915_power_well_regs *regs,
                                     int pw_idx)
{
        u32 req_mask = HSW_PWR_WELL_CTL_REQ(pw_idx);
        u32 ret;

        ret = I915_READ(regs->bios) & req_mask ? 1 : 0;
        ret |= I915_READ(regs->driver) & req_mask ? 2 : 0;
        if (regs->kvmr.reg)
                ret |= I915_READ(regs->kvmr) & req_mask ? 4 : 0;
        ret |= I915_READ(regs->debug) & req_mask ? 8 : 0;

        return ret;
}

static void hsw_wait_for_power_well_disable(struct drm_i915_private *dev_priv,
                                            struct i915_power_well *power_well)
{
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        int pw_idx = power_well->desc->hsw.idx;
        bool disabled;
        u32 reqs;

        /*
         * Bspec doesn't require waiting for PWs to get disabled, but still do
         * this for paranoia. The known cases where a PW will be forced on:
         * - a KVMR request on any power well via the KVMR request register
         * - a DMC request on PW1 and MISC_IO power wells via the BIOS and
         *   DEBUG request registers
         * Skip the wait in case any of the request bits are set and print a
         * diagnostic message.
         */
        wait_for((disabled = !(I915_READ(regs->driver) &
                               HSW_PWR_WELL_CTL_STATE(pw_idx))) ||
                 (reqs = hsw_power_well_requesters(dev_priv, regs, pw_idx)), 1);
        if (disabled)
                return;

        DRM_DEBUG_KMS("%s forced on (bios:%d driver:%d kvmr:%d debug:%d)\n",
                      power_well->desc->name,
                      !!(reqs & 1), !!(reqs & 2), !!(reqs & 4), !!(reqs & 8));
}

static void gen9_wait_for_power_well_fuses(struct drm_i915_private *dev_priv,
                                           enum skl_power_gate pg)
{
        /* Timeout 5us for PG#0, for other PGs 1us */
        WARN_ON(intel_wait_for_register(&dev_priv->uncore, SKL_FUSE_STATUS,
                                        SKL_FUSE_PG_DIST_STATUS(pg),
                                        SKL_FUSE_PG_DIST_STATUS(pg), 1));
}

static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
                                  struct i915_power_well *power_well)
{
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        int pw_idx = power_well->desc->hsw.idx;
        bool wait_fuses = power_well->desc->hsw.has_fuses;
        enum skl_power_gate uninitialized_var(pg);
        u32 val;

        if (wait_fuses) {
                pg = INTEL_GEN(dev_priv) >= 11 ? ICL_PW_CTL_IDX_TO_PG(pw_idx) :
                                                 SKL_PW_CTL_IDX_TO_PG(pw_idx);
                /*
                 * For PW1 we have to wait both for the PW0/PG0 fuse state
                 * before enabling the power well and PW1/PG1's own fuse
                 * state after the enabling. For all other power wells with
                 * fuses we only have to wait for that PW/PG's fuse state
                 * after the enabling.
                 */
                if (pg == SKL_PG1)
                        gen9_wait_for_power_well_fuses(dev_priv, SKL_PG0);
        }

        val = I915_READ(regs->driver);
        I915_WRITE(regs->driver, val | HSW_PWR_WELL_CTL_REQ(pw_idx));
        hsw_wait_for_power_well_enable(dev_priv, power_well);

        /* Display WA #1178: cnl */
        if (IS_CANNONLAKE(dev_priv) &&
            pw_idx >= GLK_PW_CTL_IDX_AUX_B &&
            pw_idx <= CNL_PW_CTL_IDX_AUX_F) {
                val = I915_READ(CNL_AUX_ANAOVRD1(pw_idx));
                val |= CNL_AUX_ANAOVRD1_ENABLE | CNL_AUX_ANAOVRD1_LDO_BYPASS;
                I915_WRITE(CNL_AUX_ANAOVRD1(pw_idx), val);
        }

        if (wait_fuses)
                gen9_wait_for_power_well_fuses(dev_priv, pg);

        hsw_power_well_post_enable(dev_priv,
                                   power_well->desc->hsw.irq_pipe_mask,
                                   power_well->desc->hsw.has_vga);
}

static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
                                   struct i915_power_well *power_well)
{
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        int pw_idx = power_well->desc->hsw.idx;
        u32 val;

        hsw_power_well_pre_disable(dev_priv,
                                   power_well->desc->hsw.irq_pipe_mask);

        val = I915_READ(regs->driver);
        I915_WRITE(regs->driver, val & ~HSW_PWR_WELL_CTL_REQ(pw_idx));
        hsw_wait_for_power_well_disable(dev_priv, power_well);
}

#define ICL_AUX_PW_TO_PORT(pw_idx)      ((pw_idx) - ICL_PW_CTL_IDX_AUX_A)

static void
icl_combo_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
                                    struct i915_power_well *power_well)
{
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        int pw_idx = power_well->desc->hsw.idx;
        enum port port = ICL_AUX_PW_TO_PORT(pw_idx);
        u32 val;

        val = I915_READ(regs->driver);
        I915_WRITE(regs->driver, val | HSW_PWR_WELL_CTL_REQ(pw_idx));

        val = I915_READ(ICL_PORT_CL_DW12(port));
        I915_WRITE(ICL_PORT_CL_DW12(port), val | ICL_LANE_ENABLE_AUX);

        hsw_wait_for_power_well_enable(dev_priv, power_well);

        /* Display WA #1178: icl */
        if (IS_ICELAKE(dev_priv) &&
            pw_idx >= ICL_PW_CTL_IDX_AUX_A && pw_idx <= ICL_PW_CTL_IDX_AUX_B &&
            !intel_bios_is_port_edp(dev_priv, port)) {
                val = I915_READ(ICL_AUX_ANAOVRD1(pw_idx));
                val |= ICL_AUX_ANAOVRD1_ENABLE | ICL_AUX_ANAOVRD1_LDO_BYPASS;
                I915_WRITE(ICL_AUX_ANAOVRD1(pw_idx), val);
        }
}

static void
icl_combo_phy_aux_power_well_disable(struct drm_i915_private *dev_priv,
                                     struct i915_power_well *power_well)
{
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        int pw_idx = power_well->desc->hsw.idx;
        enum port port = ICL_AUX_PW_TO_PORT(pw_idx);
        u32 val;

        val = I915_READ(ICL_PORT_CL_DW12(port));
        I915_WRITE(ICL_PORT_CL_DW12(port), val & ~ICL_LANE_ENABLE_AUX);

        val = I915_READ(regs->driver);
        I915_WRITE(regs->driver, val & ~HSW_PWR_WELL_CTL_REQ(pw_idx));

        hsw_wait_for_power_well_disable(dev_priv, power_well);
}

#define ICL_AUX_PW_TO_CH(pw_idx)        \
        ((pw_idx) - ICL_PW_CTL_IDX_AUX_A + AUX_CH_A)

#define ICL_TBT_AUX_PW_TO_CH(pw_idx)    \
        ((pw_idx) - ICL_PW_CTL_IDX_AUX_TBT1 + AUX_CH_C)

static void
icl_tc_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
                                 struct i915_power_well *power_well)
{
        int pw_idx = power_well->desc->hsw.idx;
        bool is_tbt = power_well->desc->hsw.is_tc_tbt;
        enum aux_ch aux_ch;
        u32 val;

        aux_ch = is_tbt ? ICL_TBT_AUX_PW_TO_CH(pw_idx) :
                          ICL_AUX_PW_TO_CH(pw_idx);
        val = I915_READ(DP_AUX_CH_CTL(aux_ch));
        val &= ~DP_AUX_CH_CTL_TBT_IO;
        if (is_tbt)
                val |= DP_AUX_CH_CTL_TBT_IO;
        I915_WRITE(DP_AUX_CH_CTL(aux_ch), val);

        hsw_power_well_enable(dev_priv, power_well);
}

/*
 * We should only use the power well if we explicitly asked the hardware to
 * enable it, so check if it's enabled and also check if we've requested it to
 * be enabled.
 */
static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv,
                                   struct i915_power_well *power_well)
{
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        enum i915_power_well_id id = power_well->desc->id;
        int pw_idx = power_well->desc->hsw.idx;
        u32 mask = HSW_PWR_WELL_CTL_REQ(pw_idx) |
                   HSW_PWR_WELL_CTL_STATE(pw_idx);
        u32 val;

        val = I915_READ(regs->driver);

        /*
         * On GEN9 big core due to a DMC bug the driver's request bits for PW1
         * and the MISC_IO PW will be not restored, so check instead for the
         * BIOS's own request bits, which are forced-on for these power wells
         * when exiting DC5/6.
         */
        if (IS_GEN(dev_priv, 9) && !IS_GEN9_LP(dev_priv) &&
            (id == SKL_DISP_PW_1 || id == SKL_DISP_PW_MISC_IO))
                val |= I915_READ(regs->bios);

        return (val & mask) == mask;
}

static void assert_can_enable_dc9(struct drm_i915_private *dev_priv)
{
        WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
                  "DC9 already programmed to be enabled.\n");
        WARN_ONCE(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
                  "DC5 still not disabled to enable DC9.\n");
        WARN_ONCE(I915_READ(HSW_PWR_WELL_CTL2) &
                  HSW_PWR_WELL_CTL_REQ(SKL_PW_CTL_IDX_PW_2),
                  "Power well 2 on.\n");
        WARN_ONCE(intel_irqs_enabled(dev_priv),
                  "Interrupts not disabled yet.\n");

         /*
          * TODO: check for the following to verify the conditions to enter DC9
          * state are satisfied:
          * 1] Check relevant display engine registers to verify if mode set
          * disable sequence was followed.
          * 2] Check if display uninitialize sequence is initialized.
          */
}

static void assert_can_disable_dc9(struct drm_i915_private *dev_priv)
{
        WARN_ONCE(intel_irqs_enabled(dev_priv),
                  "Interrupts not disabled yet.\n");
        WARN_ONCE(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
                  "DC5 still not disabled.\n");

         /*
          * TODO: check for the following to verify DC9 state was indeed
          * entered before programming to disable it:
          * 1] Check relevant display engine registers to verify if mode
          *  set disable sequence was followed.
          * 2] Check if display uninitialize sequence is initialized.
          */
}

static void gen9_write_dc_state(struct drm_i915_private *dev_priv,
                                u32 state)
{
        int rewrites = 0;
        int rereads = 0;
        u32 v;

        I915_WRITE(DC_STATE_EN, state);

        /* It has been observed that disabling the dc6 state sometimes
         * doesn't stick and dmc keeps returning old value. Make sure
         * the write really sticks enough times and also force rewrite until
         * we are confident that state is exactly what we want.
         */
        do  {
                v = I915_READ(DC_STATE_EN);

                if (v != state) {
                        I915_WRITE(DC_STATE_EN, state);
                        rewrites++;
                        rereads = 0;
                } else if (rereads++ > 5) {
                        break;
                }

        } while (rewrites < 100);

        if (v != state)
                DRM_ERROR("Writing dc state to 0x%x failed, now 0x%x\n",
                          state, v);

        /* Most of the times we need one retry, avoid spam */
        if (rewrites > 1)
                DRM_DEBUG_KMS("Rewrote dc state to 0x%x %d times\n",
                              state, rewrites);
}

static u32 gen9_dc_mask(struct drm_i915_private *dev_priv)
{
        u32 mask;

        mask = DC_STATE_EN_UPTO_DC5;
        if (INTEL_GEN(dev_priv) >= 11)
                mask |= DC_STATE_EN_UPTO_DC6 | DC_STATE_EN_DC9;
        else if (IS_GEN9_LP(dev_priv))
                mask |= DC_STATE_EN_DC9;
        else
                mask |= DC_STATE_EN_UPTO_DC6;

        return mask;
}

void gen9_sanitize_dc_state(struct drm_i915_private *dev_priv)
{
        u32 val;

        val = I915_READ(DC_STATE_EN) & gen9_dc_mask(dev_priv);

        DRM_DEBUG_KMS("Resetting DC state tracking from %02x to %02x\n",
                      dev_priv->csr.dc_state, val);
        dev_priv->csr.dc_state = val;
}

/**
 * gen9_set_dc_state - set target display C power state
 * @dev_priv: i915 device instance
 * @state: target DC power state
 * - DC_STATE_DISABLE
 * - DC_STATE_EN_UPTO_DC5
 * - DC_STATE_EN_UPTO_DC6
 * - DC_STATE_EN_DC9
 *
 * Signal to DMC firmware/HW the target DC power state passed in @state.
 * DMC/HW can turn off individual display clocks and power rails when entering
 * a deeper DC power state (higher in number) and turns these back when exiting
 * that state to a shallower power state (lower in number). The HW will decide
 * when to actually enter a given state on an on-demand basis, for instance
 * depending on the active state of display pipes. The state of display
 * registers backed by affected power rails are saved/restored as needed.
 *
 * Based on the above enabling a deeper DC power state is asynchronous wrt.
 * enabling it. Disabling a deeper power state is synchronous: for instance
 * setting %DC_STATE_DISABLE won't complete until all HW resources are turned
 * back on and register state is restored. This is guaranteed by the MMIO write
 * to DC_STATE_EN blocking until the state is restored.
 */
static void gen9_set_dc_state(struct drm_i915_private *dev_priv, u32 state)
{
        u32 val;
        u32 mask;

        if (WARN_ON_ONCE(state & ~dev_priv->csr.allowed_dc_mask))
                state &= dev_priv->csr.allowed_dc_mask;

        val = I915_READ(DC_STATE_EN);
        mask = gen9_dc_mask(dev_priv);
        DRM_DEBUG_KMS("Setting DC state from %02x to %02x\n",
                      val & mask, state);

        /* Check if DMC is ignoring our DC state requests */
        if ((val & mask) != dev_priv->csr.dc_state)
                DRM_ERROR("DC state mismatch (0x%x -> 0x%x)\n",
                          dev_priv->csr.dc_state, val & mask);

        val &= ~mask;
        val |= state;

        gen9_write_dc_state(dev_priv, val);

        dev_priv->csr.dc_state = val & mask;
}

void bxt_enable_dc9(struct drm_i915_private *dev_priv)
{
        assert_can_enable_dc9(dev_priv);

        DRM_DEBUG_KMS("Enabling DC9\n");
        /*
         * Power sequencer reset is not needed on
         * platforms with South Display Engine on PCH,
         * because PPS registers are always on.
         */
        if (!HAS_PCH_SPLIT(dev_priv))
                intel_power_sequencer_reset(dev_priv);
        gen9_set_dc_state(dev_priv, DC_STATE_EN_DC9);
}

void bxt_disable_dc9(struct drm_i915_private *dev_priv)
{
        assert_can_disable_dc9(dev_priv);

        DRM_DEBUG_KMS("Disabling DC9\n");

        gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);

        intel_pps_unlock_regs_wa(dev_priv);
}

static void assert_csr_loaded(struct drm_i915_private *dev_priv)
{
        WARN_ONCE(!I915_READ(CSR_PROGRAM(0)),
                  "CSR program storage start is NULL\n");
        WARN_ONCE(!I915_READ(CSR_SSP_BASE), "CSR SSP Base Not fine\n");
        WARN_ONCE(!I915_READ(CSR_HTP_SKL), "CSR HTP Not fine\n");
}

static struct i915_power_well *
lookup_power_well(struct drm_i915_private *dev_priv,
                  enum i915_power_well_id power_well_id)
{
        struct i915_power_well *power_well;

        for_each_power_well(dev_priv, power_well)
                if (power_well->desc->id == power_well_id)
                        return power_well;

        /*
         * It's not feasible to add error checking code to the callers since
         * this condition really shouldn't happen and it doesn't even make sense
         * to abort things like display initialization sequences. Just return
         * the first power well and hope the WARN gets reported so we can fix
         * our driver.
         */
        WARN(1, "Power well %d not defined for this platform\n", power_well_id);
        return &dev_priv->power_domains.power_wells[0];
}

static void assert_can_enable_dc5(struct drm_i915_private *dev_priv)
{
        bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
                                        SKL_DISP_PW_2);

        WARN_ONCE(pg2_enabled, "PG2 not disabled to enable DC5.\n");

        WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5),
                  "DC5 already programmed to be enabled.\n");
        assert_rpm_wakelock_held(&dev_priv->runtime_pm);

        assert_csr_loaded(dev_priv);
}

void gen9_enable_dc5(struct drm_i915_private *dev_priv)
{
        assert_can_enable_dc5(dev_priv);

        DRM_DEBUG_KMS("Enabling DC5\n");

        /* Wa Display #1183: skl,kbl,cfl */
        if (IS_GEN9_BC(dev_priv))
                I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) |
                           SKL_SELECT_ALTERNATE_DC_EXIT);

        gen9_set_dc_state(dev_priv, DC_STATE_EN_UPTO_DC5);
}

static void assert_can_enable_dc6(struct drm_i915_private *dev_priv)
{
        WARN_ONCE(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
                  "Backlight is not disabled.\n");
        WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
                  "DC6 already programmed to be enabled.\n");

        assert_csr_loaded(dev_priv);
}

void skl_enable_dc6(struct drm_i915_private *dev_priv)
{
        assert_can_enable_dc6(dev_priv);

        DRM_DEBUG_KMS("Enabling DC6\n");

        /* Wa Display #1183: skl,kbl,cfl */
        if (IS_GEN9_BC(dev_priv))
                I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) |
                           SKL_SELECT_ALTERNATE_DC_EXIT);

        gen9_set_dc_state(dev_priv, DC_STATE_EN_UPTO_DC6);
}

static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv,
                                   struct i915_power_well *power_well)
{
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        int pw_idx = power_well->desc->hsw.idx;
        u32 mask = HSW_PWR_WELL_CTL_REQ(pw_idx);
        u32 bios_req = I915_READ(regs->bios);

        /* Take over the request bit if set by BIOS. */
        if (bios_req & mask) {
                u32 drv_req = I915_READ(regs->driver);

                if (!(drv_req & mask))
                        I915_WRITE(regs->driver, drv_req | mask);
                I915_WRITE(regs->bios, bios_req & ~mask);
        }
}

static void bxt_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
{
        bxt_ddi_phy_init(dev_priv, power_well->desc->bxt.phy);
}

static void bxt_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
                                            struct i915_power_well *power_well)
{
        bxt_ddi_phy_uninit(dev_priv, power_well->desc->bxt.phy);
}

static bool bxt_dpio_cmn_power_well_enabled(struct drm_i915_private *dev_priv,
                                            struct i915_power_well *power_well)
{
        return bxt_ddi_phy_is_enabled(dev_priv, power_well->desc->bxt.phy);
}

static void bxt_verify_ddi_phy_power_wells(struct drm_i915_private *dev_priv)
{
        struct i915_power_well *power_well;

        power_well = lookup_power_well(dev_priv, BXT_DISP_PW_DPIO_CMN_A);
        if (power_well->count > 0)
                bxt_ddi_phy_verify_state(dev_priv, power_well->desc->bxt.phy);

        power_well = lookup_power_well(dev_priv, VLV_DISP_PW_DPIO_CMN_BC);
        if (power_well->count > 0)
                bxt_ddi_phy_verify_state(dev_priv, power_well->desc->bxt.phy);

        if (IS_GEMINILAKE(dev_priv)) {
                power_well = lookup_power_well(dev_priv,
                                               GLK_DISP_PW_DPIO_CMN_C);
                if (power_well->count > 0)
                        bxt_ddi_phy_verify_state(dev_priv,
                                                 power_well->desc->bxt.phy);
        }
}

static bool gen9_dc_off_power_well_enabled(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
{
        return (I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5_DC6_MASK) == 0;
}

static void gen9_assert_dbuf_enabled(struct drm_i915_private *dev_priv)
{
        u32 tmp = I915_READ(DBUF_CTL);

        WARN((tmp & (DBUF_POWER_STATE | DBUF_POWER_REQUEST)) !=
             (DBUF_POWER_STATE | DBUF_POWER_REQUEST),
             "Unexpected DBuf power power state (0x%08x)\n", tmp);
}

static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
                                          struct i915_power_well *power_well)
{
        struct intel_cdclk_state cdclk_state = {};

        gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);

        dev_priv->display.get_cdclk(dev_priv, &cdclk_state);
        /* Can't read out voltage_level so can't use intel_cdclk_changed() */
        WARN_ON(intel_cdclk_needs_modeset(&dev_priv->cdclk.hw, &cdclk_state));

        gen9_assert_dbuf_enabled(dev_priv);

        if (IS_GEN9_LP(dev_priv))
                bxt_verify_ddi_phy_power_wells(dev_priv);

        if (INTEL_GEN(dev_priv) >= 11)
                /*
                 * DMC retains HW context only for port A, the other combo
                 * PHY's HW context for port B is lost after DC transitions,
                 * so we need to restore it manually.
                 */
                intel_combo_phy_init(dev_priv);
}

static void gen9_dc_off_power_well_disable(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
{
        if (!dev_priv->csr.dmc_payload)
                return;

        if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC6)
                skl_enable_dc6(dev_priv);
        else if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC5)
                gen9_enable_dc5(dev_priv);
}

static void i9xx_power_well_sync_hw_noop(struct drm_i915_private *dev_priv,
                                         struct i915_power_well *power_well)
{
}

static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
{
}

static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv,
                                             struct i915_power_well *power_well)
{
        return true;
}

static void i830_pipes_power_well_enable(struct drm_i915_private *dev_priv,
                                         struct i915_power_well *power_well)
{
        if ((I915_READ(PIPECONF(PIPE_A)) & PIPECONF_ENABLE) == 0)
                i830_enable_pipe(dev_priv, PIPE_A);
        if ((I915_READ(PIPECONF(PIPE_B)) & PIPECONF_ENABLE) == 0)
                i830_enable_pipe(dev_priv, PIPE_B);
}

static void i830_pipes_power_well_disable(struct drm_i915_private *dev_priv,
                                          struct i915_power_well *power_well)
{
        i830_disable_pipe(dev_priv, PIPE_B);
        i830_disable_pipe(dev_priv, PIPE_A);
}

static bool i830_pipes_power_well_enabled(struct drm_i915_private *dev_priv,
                                          struct i915_power_well *power_well)
{
        return I915_READ(PIPECONF(PIPE_A)) & PIPECONF_ENABLE &&
                I915_READ(PIPECONF(PIPE_B)) & PIPECONF_ENABLE;
}

static void i830_pipes_power_well_sync_hw(struct drm_i915_private *dev_priv,
                                          struct i915_power_well *power_well)
{
        if (power_well->count > 0)
                i830_pipes_power_well_enable(dev_priv, power_well);
        else
                i830_pipes_power_well_disable(dev_priv, power_well);
}

static void vlv_set_power_well(struct drm_i915_private *dev_priv,
                               struct i915_power_well *power_well, bool enable)
{
        int pw_idx = power_well->desc->vlv.idx;
        u32 mask;
        u32 state;
        u32 ctrl;

        mask = PUNIT_PWRGT_MASK(pw_idx);
        state = enable ? PUNIT_PWRGT_PWR_ON(pw_idx) :
                         PUNIT_PWRGT_PWR_GATE(pw_idx);

        vlv_punit_get(dev_priv);

#define COND \
        ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state)

        if (COND)
                goto out;

        ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL);
        ctrl &= ~mask;
        ctrl |= state;
        vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl);

        if (wait_for(COND, 100))
                DRM_ERROR("timeout setting power well state %08x (%08x)\n",
                          state,
                          vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL));

#undef COND

out:
        vlv_punit_put(dev_priv);
}

static void vlv_power_well_enable(struct drm_i915_private *dev_priv,
                                  struct i915_power_well *power_well)
{
        vlv_set_power_well(dev_priv, power_well, true);
}

static void vlv_power_well_disable(struct drm_i915_private *dev_priv,
                                   struct i915_power_well *power_well)
{
        vlv_set_power_well(dev_priv, power_well, false);
}

static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
                                   struct i915_power_well *power_well)
{
        int pw_idx = power_well->desc->vlv.idx;
        bool enabled = false;
        u32 mask;
        u32 state;
        u32 ctrl;

        mask = PUNIT_PWRGT_MASK(pw_idx);
        ctrl = PUNIT_PWRGT_PWR_ON(pw_idx);

        vlv_punit_get(dev_priv);

        state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask;
        /*
         * We only ever set the power-on and power-gate states, anything
         * else is unexpected.
         */
        WARN_ON(state != PUNIT_PWRGT_PWR_ON(pw_idx) &&
                state != PUNIT_PWRGT_PWR_GATE(pw_idx));
        if (state == ctrl)
                enabled = true;

        /*
         * A transient state at this point would mean some unexpected party
         * is poking at the power controls too.
         */
        ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask;
        WARN_ON(ctrl != state);

        vlv_punit_put(dev_priv);

        return enabled;
}

static void vlv_init_display_clock_gating(struct drm_i915_private *dev_priv)
{
        u32 val;

        /*
         * On driver load, a pipe may be active and driving a DSI display.
         * Preserve DPOUNIT_CLOCK_GATE_DISABLE to avoid the pipe getting stuck
         * (and never recovering) in this case. intel_dsi_post_disable() will
         * clear it when we turn off the display.
         */

        val = I915_READ(DSPCLK_GATE_D);
        val &= DPOUNIT_CLOCK_GATE_DISABLE;
        val |= VRHUNIT_CLOCK_GATE_DISABLE;
        I915_WRITE(DSPCLK_GATE_D, val);

        /*
         * Disable trickle feed and enable pnd deadline calculation
         */
        I915_WRITE(MI_ARB_VLV, MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE);
        I915_WRITE(CBR1_VLV, 0);

        WARN_ON(dev_priv->rawclk_freq == 0);

        I915_WRITE(RAWCLK_FREQ_VLV,
                   DIV_ROUND_CLOSEST(dev_priv->rawclk_freq, 1000));
}

static void vlv_display_power_well_init(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        enum pipe pipe;

        /*
         * Enable the CRI clock source so we can get at the
         * display and the reference clock for VGA
         * hotplug / manual detection. Supposedly DSI also
         * needs the ref clock up and running.
         *
         * CHV DPLL B/C have some issues if VGA mode is enabled.
         */
        for_each_pipe(dev_priv, pipe) {
                u32 val = I915_READ(DPLL(pipe));

                val |= DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
                if (pipe != PIPE_A)
                        val |= DPLL_INTEGRATED_CRI_CLK_VLV;

                I915_WRITE(DPLL(pipe), val);
        }

        vlv_init_display_clock_gating(dev_priv);

        spin_lock_irq(&dev_priv->irq_lock);
        valleyview_enable_display_irqs(dev_priv);
        spin_unlock_irq(&dev_priv->irq_lock);

        /*
         * During driver initialization/resume we can avoid restoring the
         * part of the HW/SW state that will be inited anyway explicitly.
         */
        if (dev_priv->power_domains.initializing)
                return;

        intel_hpd_init(dev_priv);

        /* Re-enable the ADPA, if we have one */
        for_each_intel_encoder(&dev_priv->drm, encoder) {
                if (encoder->type == INTEL_OUTPUT_ANALOG)
                        intel_crt_reset(&encoder->base);
        }

        i915_redisable_vga_power_on(dev_priv);

        intel_pps_unlock_regs_wa(dev_priv);
}

static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv)
{
        spin_lock_irq(&dev_priv->irq_lock);
        valleyview_disable_display_irqs(dev_priv);
        spin_unlock_irq(&dev_priv->irq_lock);

        /* make sure we're done processing display irqs */
        synchronize_irq(dev_priv->drm.irq);

        intel_power_sequencer_reset(dev_priv);

        /* Prevent us from re-enabling polling on accident in late suspend */
        if (!dev_priv->drm.dev->power.is_suspended)
                intel_hpd_poll_init(dev_priv);
}

static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,
                                          struct i915_power_well *power_well)
{
        vlv_set_power_well(dev_priv, power_well, true);

        vlv_display_power_well_init(dev_priv);
}

static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
{
        vlv_display_power_well_deinit(dev_priv);

        vlv_set_power_well(dev_priv, power_well, false);
}

static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
{
        /* since ref/cri clock was enabled */
        udelay(1); /* >10ns for cmnreset, >0ns for sidereset */

        vlv_set_power_well(dev_priv, power_well, true);

        /*
         * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx -
         *  6.  De-assert cmn_reset/side_reset. Same as VLV X0.
         *   a. GUnit 0x2110 bit[0] set to 1 (def 0)
         *   b. The other bits such as sfr settings / modesel may all
         *      be set to 0.
         *
         * This should only be done on init and resume from S3 with
         * both PLLs disabled, or we risk losing DPIO and PLL
         * synchronization.
         */
        I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST);
}

static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
                                            struct i915_power_well *power_well)
{
        enum pipe pipe;

        for_each_pipe(dev_priv, pipe)
                assert_pll_disabled(dev_priv, pipe);

        /* Assert common reset */
        I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST);

        vlv_set_power_well(dev_priv, power_well, false);
}

#define POWER_DOMAIN_MASK (GENMASK_ULL(POWER_DOMAIN_NUM - 1, 0))

#define BITS_SET(val, bits) (((val) & (bits)) == (bits))

static void assert_chv_phy_status(struct drm_i915_private *dev_priv)
{
        struct i915_power_well *cmn_bc =
                lookup_power_well(dev_priv, VLV_DISP_PW_DPIO_CMN_BC);
        struct i915_power_well *cmn_d =
                lookup_power_well(dev_priv, CHV_DISP_PW_DPIO_CMN_D);
        u32 phy_control = dev_priv->chv_phy_control;
        u32 phy_status = 0;
        u32 phy_status_mask = 0xffffffff;

        /*
         * The BIOS can leave the PHY is some weird state
         * where it doesn't fully power down some parts.
         * Disable the asserts until the PHY has been fully
         * reset (ie. the power well has been disabled at
         * least once).
         */
        if (!dev_priv->chv_phy_assert[DPIO_PHY0])
                phy_status_mask &= ~(PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH0) |
                                     PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 0) |
                                     PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 1) |
                                     PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH1) |
                                     PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 0) |
                                     PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 1));

        if (!dev_priv->chv_phy_assert[DPIO_PHY1])
                phy_status_mask &= ~(PHY_STATUS_CMN_LDO(DPIO_PHY1, DPIO_CH0) |
                                     PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 0) |
                                     PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 1));

        if (cmn_bc->desc->ops->is_enabled(dev_priv, cmn_bc)) {
                phy_status |= PHY_POWERGOOD(DPIO_PHY0);

                /* this assumes override is only used to enable lanes */
                if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH0)) == 0)
                        phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH0);

                if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH1)) == 0)
                        phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1);

                /* CL1 is on whenever anything is on in either channel */
                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH0) |
                             PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1)))
                        phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH0);

                /*
                 * The DPLLB check accounts for the pipe B + port A usage
                 * with CL2 powered up but all the lanes in the second channel
                 * powered down.
                 */
                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1)) &&
                    (I915_READ(DPLL(PIPE_B)) & DPLL_VCO_ENABLE) == 0)
                        phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH1);

                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY0, DPIO_CH0)))
                        phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 0);
                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY0, DPIO_CH0)))
                        phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 1);

                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY0, DPIO_CH1)))
                        phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 0);
                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY0, DPIO_CH1)))
                        phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 1);
        }

        if (cmn_d->desc->ops->is_enabled(dev_priv, cmn_d)) {
                phy_status |= PHY_POWERGOOD(DPIO_PHY1);

                /* this assumes override is only used to enable lanes */
                if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY1, DPIO_CH0)) == 0)
                        phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY1, DPIO_CH0);

                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY1, DPIO_CH0)))
                        phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY1, DPIO_CH0);

                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY1, DPIO_CH0)))
                        phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 0);
                if (BITS_SET(phy_control,
                             PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY1, DPIO_CH0)))
                        phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 1);
        }

        phy_status &= phy_status_mask;

        /*
         * The PHY may be busy with some initial calibration and whatnot,
         * so the power state can take a while to actually change.
         */
        if (intel_wait_for_register(&dev_priv->uncore,
                                    DISPLAY_PHY_STATUS,
                                    phy_status_mask,
                                    phy_status,
                                    10))
                DRM_ERROR("Unexpected PHY_STATUS 0x%08x, expected 0x%08x (PHY_CONTROL=0x%08x)\n",
                          I915_READ(DISPLAY_PHY_STATUS) & phy_status_mask,
                           phy_status, dev_priv->chv_phy_control);
}

#undef BITS_SET

static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
{
        enum dpio_phy phy;
        enum pipe pipe;
        u32 tmp;

        WARN_ON_ONCE(power_well->desc->id != VLV_DISP_PW_DPIO_CMN_BC &&
                     power_well->desc->id != CHV_DISP_PW_DPIO_CMN_D);

        if (power_well->desc->id == VLV_DISP_PW_DPIO_CMN_BC) {
                pipe = PIPE_A;
                phy = DPIO_PHY0;
        } else {
                pipe = PIPE_C;
                phy = DPIO_PHY1;
        }

        /* since ref/cri clock was enabled */
        udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
        vlv_set_power_well(dev_priv, power_well, true);

        /* Poll for phypwrgood signal */
        if (intel_wait_for_register(&dev_priv->uncore,
                                    DISPLAY_PHY_STATUS,
                                    PHY_POWERGOOD(phy),
                                    PHY_POWERGOOD(phy),
                                    1))
                DRM_ERROR("Display PHY %d is not power up\n", phy);

        vlv_dpio_get(dev_priv);

        /* Enable dynamic power down */
        tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW28);
        tmp |= DPIO_DYNPWRDOWNEN_CH0 | DPIO_CL1POWERDOWNEN |
                DPIO_SUS_CLK_CONFIG_GATE_CLKREQ;
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW28, tmp);

        if (power_well->desc->id == VLV_DISP_PW_DPIO_CMN_BC) {
                tmp = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW6_CH1);
                tmp |= DPIO_DYNPWRDOWNEN_CH1;
                vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW6_CH1, tmp);
        } else {
                /*
                 * Force the non-existing CL2 off. BXT does this
                 * too, so maybe it saves some power even though
                 * CL2 doesn't exist?
                 */
                tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30);
                tmp |= DPIO_CL2_LDOFUSE_PWRENB;
                vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, tmp);
        }

        vlv_dpio_put(dev_priv);

        dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy);
        I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);

        DRM_DEBUG_KMS("Enabled DPIO PHY%d (PHY_CONTROL=0x%08x)\n",
                      phy, dev_priv->chv_phy_control);

        assert_chv_phy_status(dev_priv);
}

static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
                                            struct i915_power_well *power_well)
{
        enum dpio_phy phy;

        WARN_ON_ONCE(power_well->desc->id != VLV_DISP_PW_DPIO_CMN_BC &&
                     power_well->desc->id != CHV_DISP_PW_DPIO_CMN_D);

        if (power_well->desc->id == VLV_DISP_PW_DPIO_CMN_BC) {
                phy = DPIO_PHY0;
                assert_pll_disabled(dev_priv, PIPE_A);
                assert_pll_disabled(dev_priv, PIPE_B);
        } else {
                phy = DPIO_PHY1;
                assert_pll_disabled(dev_priv, PIPE_C);
        }

        dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy);
        I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);

        vlv_set_power_well(dev_priv, power_well, false);

        DRM_DEBUG_KMS("Disabled DPIO PHY%d (PHY_CONTROL=0x%08x)\n",
                      phy, dev_priv->chv_phy_control);

        /* PHY is fully reset now, so we can enable the PHY state asserts */
        dev_priv->chv_phy_assert[phy] = true;

        assert_chv_phy_status(dev_priv);
}

static void assert_chv_phy_powergate(struct drm_i915_private *dev_priv, enum dpio_phy phy,
                                     enum dpio_channel ch, bool override, unsigned int mask)
{
        enum pipe pipe = phy == DPIO_PHY0 ? PIPE_A : PIPE_C;
        u32 reg, val, expected, actual;

        /*
         * The BIOS can leave the PHY is some weird state
         * where it doesn't fully power down some parts.
         * Disable the asserts until the PHY has been fully
         * reset (ie. the power well has been disabled at
         * least once).
         */
        if (!dev_priv->chv_phy_assert[phy])
                return;

        if (ch == DPIO_CH0)
                reg = _CHV_CMN_DW0_CH0;
        else
                reg = _CHV_CMN_DW6_CH1;

        vlv_dpio_get(dev_priv);
        val = vlv_dpio_read(dev_priv, pipe, reg);
        vlv_dpio_put(dev_priv);

        /*
         * This assumes !override is only used when the port is disabled.
         * All lanes should power down even without the override when
         * the port is disabled.
         */
        if (!override || mask == 0xf) {
                expected = DPIO_ALLDL_POWERDOWN | DPIO_ANYDL_POWERDOWN;
                /*
                 * If CH1 common lane is not active anymore
                 * (eg. for pipe B DPLL) the entire channel will
                 * shut down, which causes the common lane registers
                 * to read as 0. That means we can't actually check
                 * the lane power down status bits, but as the entire
                 * register reads as 0 it's a good indication that the
                 * channel is indeed entirely powered down.
                 */
                if (ch == DPIO_CH1 && val == 0)
                        expected = 0;
        } else if (mask != 0x0) {
                expected = DPIO_ANYDL_POWERDOWN;
        } else {
                expected = 0;
        }

        if (ch == DPIO_CH0)
                actual = val >> DPIO_ANYDL_POWERDOWN_SHIFT_CH0;
        else
                actual = val >> DPIO_ANYDL_POWERDOWN_SHIFT_CH1;
        actual &= DPIO_ALLDL_POWERDOWN | DPIO_ANYDL_POWERDOWN;

        WARN(actual != expected,
             "Unexpected DPIO lane power down: all %d, any %d. Expected: all %d, any %d. (0x%x = 0x%08x)\n",
             !!(actual & DPIO_ALLDL_POWERDOWN), !!(actual & DPIO_ANYDL_POWERDOWN),
             !!(expected & DPIO_ALLDL_POWERDOWN), !!(expected & DPIO_ANYDL_POWERDOWN),
             reg, val);
}

bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy,
                          enum dpio_channel ch, bool override)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        bool was_override;

        mutex_lock(&power_domains->lock);

        was_override = dev_priv->chv_phy_control & PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);

        if (override == was_override)
                goto out;

        if (override)
                dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
        else
                dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);

        I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);

        DRM_DEBUG_KMS("Power gating DPIO PHY%d CH%d (DPIO_PHY_CONTROL=0x%08x)\n",
                      phy, ch, dev_priv->chv_phy_control);

        assert_chv_phy_status(dev_priv);

out:
        mutex_unlock(&power_domains->lock);

        return was_override;
}

void chv_phy_powergate_lanes(struct intel_encoder *encoder,
                             bool override, unsigned int mask)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        enum dpio_phy phy = vlv_dport_to_phy(enc_to_dig_port(&encoder->base));
        enum dpio_channel ch = vlv_dport_to_channel(enc_to_dig_port(&encoder->base));

        mutex_lock(&power_domains->lock);

        dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD(0xf, phy, ch);
        dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD(mask, phy, ch);

        if (override)
                dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
        else
                dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);

        I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);

        DRM_DEBUG_KMS("Power gating DPIO PHY%d CH%d lanes 0x%x (PHY_CONTROL=0x%08x)\n",
                      phy, ch, mask, dev_priv->chv_phy_control);

        assert_chv_phy_status(dev_priv);

        assert_chv_phy_powergate(dev_priv, phy, ch, override, mask);

        mutex_unlock(&power_domains->lock);
}

static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
                                        struct i915_power_well *power_well)
{
        enum pipe pipe = PIPE_A;
        bool enabled;
        u32 state, ctrl;

        vlv_punit_get(dev_priv);

        state = vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM) & DP_SSS_MASK(pipe);
        /*
         * We only ever set the power-on and power-gate states, anything
         * else is unexpected.
         */
        WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe));
        enabled = state == DP_SSS_PWR_ON(pipe);

        /*
         * A transient state at this point would mean some unexpected party
         * is poking at the power controls too.
         */
        ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM) & DP_SSC_MASK(pipe);
        WARN_ON(ctrl << 16 != state);

        vlv_punit_put(dev_priv);

        return enabled;
}

static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
                                    struct i915_power_well *power_well,
                                    bool enable)
{
        enum pipe pipe = PIPE_A;
        u32 state;
        u32 ctrl;

        state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe);

        vlv_punit_get(dev_priv);

#define COND \
        ((vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM) & DP_SSS_MASK(pipe)) == state)

        if (COND)
                goto out;

        ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM);
        ctrl &= ~DP_SSC_MASK(pipe);
        ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe);
        vlv_punit_write(dev_priv, PUNIT_REG_DSPSSPM, ctrl);

        if (wait_for(COND, 100))
                DRM_ERROR("timeout setting power well state %08x (%08x)\n",
                          state,
                          vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM));

#undef COND

out:
        vlv_punit_put(dev_priv);
}

static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv,
                                       struct i915_power_well *power_well)
{
        chv_set_pipe_power_well(dev_priv, power_well, true);

        vlv_display_power_well_init(dev_priv);
}

static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv,
                                        struct i915_power_well *power_well)
{
        vlv_display_power_well_deinit(dev_priv);

        chv_set_pipe_power_well(dev_priv, power_well, false);
}

static u64 __async_put_domains_mask(struct i915_power_domains *power_domains)
{
        return power_domains->async_put_domains[0] |
               power_domains->async_put_domains[1];
}

#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)

static bool
assert_async_put_domain_masks_disjoint(struct i915_power_domains *power_domains)
{
        return !WARN_ON(power_domains->async_put_domains[0] &
                        power_domains->async_put_domains[1]);
}

static bool
__async_put_domains_state_ok(struct i915_power_domains *power_domains)
{
        enum intel_display_power_domain domain;
        bool err = false;

        err |= !assert_async_put_domain_masks_disjoint(power_domains);
        err |= WARN_ON(!!power_domains->async_put_wakeref !=
                       !!__async_put_domains_mask(power_domains));

        for_each_power_domain(domain, __async_put_domains_mask(power_domains))
                err |= WARN_ON(power_domains->domain_use_count[domain] != 1);

        return !err;
}

static void print_power_domains(struct i915_power_domains *power_domains,
                                const char *prefix, u64 mask)
{
        enum intel_display_power_domain domain;

        DRM_DEBUG_DRIVER("%s (%lu):\n", prefix, hweight64(mask));
        for_each_power_domain(domain, mask)
                DRM_DEBUG_DRIVER("%s use_count %d\n",
                                 intel_display_power_domain_str(domain),
                                 power_domains->domain_use_count[domain]);
}

static void
print_async_put_domains_state(struct i915_power_domains *power_domains)
{
        DRM_DEBUG_DRIVER("async_put_wakeref %u\n",
                         power_domains->async_put_wakeref);

        print_power_domains(power_domains, "async_put_domains[0]",
                            power_domains->async_put_domains[0]);
        print_power_domains(power_domains, "async_put_domains[1]",
                            power_domains->async_put_domains[1]);
}

static void
verify_async_put_domains_state(struct i915_power_domains *power_domains)
{
        if (!__async_put_domains_state_ok(power_domains))
                print_async_put_domains_state(power_domains);
}

#else

static void
assert_async_put_domain_masks_disjoint(struct i915_power_domains *power_domains)
{
}

static void
verify_async_put_domains_state(struct i915_power_domains *power_domains)
{
}

#endif /* CONFIG_DRM_I915_DEBUG_RUNTIME_PM */

static u64 async_put_domains_mask(struct i915_power_domains *power_domains)
{
        assert_async_put_domain_masks_disjoint(power_domains);

        return __async_put_domains_mask(power_domains);
}

static void
async_put_domains_clear_domain(struct i915_power_domains *power_domains,
                               enum intel_display_power_domain domain)
{
        assert_async_put_domain_masks_disjoint(power_domains);

        power_domains->async_put_domains[0] &= ~BIT_ULL(domain);
        power_domains->async_put_domains[1] &= ~BIT_ULL(domain);
}

static bool
intel_display_power_grab_async_put_ref(struct drm_i915_private *dev_priv,
                                       enum intel_display_power_domain domain)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        bool ret = false;

        if (!(async_put_domains_mask(power_domains) & BIT_ULL(domain)))
                goto out_verify;

        async_put_domains_clear_domain(power_domains, domain);

        ret = true;

        if (async_put_domains_mask(power_domains))
                goto out_verify;

        cancel_delayed_work(&power_domains->async_put_work);
        intel_runtime_pm_put_raw(&dev_priv->runtime_pm,
                                 fetch_and_zero(&power_domains->async_put_wakeref));
out_verify:
        verify_async_put_domains_state(power_domains);

        return ret;
}

static void
__intel_display_power_get_domain(struct drm_i915_private *dev_priv,
                                 enum intel_display_power_domain domain)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        struct i915_power_well *power_well;

        if (intel_display_power_grab_async_put_ref(dev_priv, domain))
                return;

        for_each_power_domain_well(dev_priv, power_well, BIT_ULL(domain))
                intel_power_well_get(dev_priv, power_well);

        power_domains->domain_use_count[domain]++;
}

/**
 * intel_display_power_get - grab a power domain reference
 * @dev_priv: i915 device instance
 * @domain: power domain to reference
 *
 * This function grabs a power domain reference for @domain and ensures that the
 * power domain and all its parents are powered up. Therefore users should only
 * grab a reference to the innermost power domain they need.
 *
 * Any power domain reference obtained by this function must have a symmetric
 * call to intel_display_power_put() to release the reference again.
 */
intel_wakeref_t intel_display_power_get(struct drm_i915_private *dev_priv,
                                        enum intel_display_power_domain domain)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        intel_wakeref_t wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);

        mutex_lock(&power_domains->lock);
        __intel_display_power_get_domain(dev_priv, domain);
        mutex_unlock(&power_domains->lock);

        return wakeref;
}

/**
 * intel_display_power_get_if_enabled - grab a reference for an enabled display power domain
 * @dev_priv: i915 device instance
 * @domain: power domain to reference
 *
 * This function grabs a power domain reference for @domain and ensures that the
 * power domain and all its parents are powered up. Therefore users should only
 * grab a reference to the innermost power domain they need.
 *
 * Any power domain reference obtained by this function must have a symmetric
 * call to intel_display_power_put() to release the reference again.
 */
intel_wakeref_t
intel_display_power_get_if_enabled(struct drm_i915_private *dev_priv,
                                   enum intel_display_power_domain domain)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        intel_wakeref_t wakeref;
        bool is_enabled;

        wakeref = intel_runtime_pm_get_if_in_use(&dev_priv->runtime_pm);
        if (!wakeref)
                return false;

        mutex_lock(&power_domains->lock);

        if (__intel_display_power_is_enabled(dev_priv, domain)) {
                __intel_display_power_get_domain(dev_priv, domain);
                is_enabled = true;
        } else {
                is_enabled = false;
        }

        mutex_unlock(&power_domains->lock);

        if (!is_enabled) {
                intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
                wakeref = 0;
        }

        return wakeref;
}

static void
__intel_display_power_put_domain(struct drm_i915_private *dev_priv,
                                 enum intel_display_power_domain domain)
{
        struct i915_power_domains *power_domains;
        struct i915_power_well *power_well;
        const char *name = intel_display_power_domain_str(domain);

        power_domains = &dev_priv->power_domains;

        WARN(!power_domains->domain_use_count[domain],
             "Use count on domain %s is already zero\n",
             name);
        WARN(async_put_domains_mask(power_domains) & BIT_ULL(domain),
             "Async disabling of domain %s is pending\n",
             name);

        power_domains->domain_use_count[domain]--;

        for_each_power_domain_well_reverse(dev_priv, power_well, BIT_ULL(domain))
                intel_power_well_put(dev_priv, power_well);
}

static void __intel_display_power_put(struct drm_i915_private *dev_priv,
                                      enum intel_display_power_domain domain)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;

        mutex_lock(&power_domains->lock);
        __intel_display_power_put_domain(dev_priv, domain);
        mutex_unlock(&power_domains->lock);
}

/**
 * intel_display_power_put_unchecked - release an unchecked power domain reference
 * @dev_priv: i915 device instance
 * @domain: power domain to reference
 *
 * This function drops the power domain reference obtained by
 * intel_display_power_get() and might power down the corresponding hardware
 * block right away if this is the last reference.
 *
 * This function exists only for historical reasons and should be avoided in
 * new code, as the correctness of its use cannot be checked. Always use
 * intel_display_power_put() instead.
 */
void intel_display_power_put_unchecked(struct drm_i915_private *dev_priv,
                                       enum intel_display_power_domain domain)
{
        __intel_display_power_put(dev_priv, domain);
        intel_runtime_pm_put_unchecked(&dev_priv->runtime_pm);
}

static void
queue_async_put_domains_work(struct i915_power_domains *power_domains,
                             intel_wakeref_t wakeref)
{
        WARN_ON(power_domains->async_put_wakeref);
        power_domains->async_put_wakeref = wakeref;
        WARN_ON(!queue_delayed_work(system_unbound_wq,
                                    &power_domains->async_put_work,
                                    msecs_to_jiffies(100)));
}

static void
release_async_put_domains(struct i915_power_domains *power_domains, u64 mask)
{
        struct drm_i915_private *dev_priv =
                container_of(power_domains, struct drm_i915_private,
                             power_domains);
        struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;
        enum intel_display_power_domain domain;
        intel_wakeref_t wakeref;

        /*
         * The caller must hold already raw wakeref, upgrade that to a proper
         * wakeref to make the state checker happy about the HW access during
         * power well disabling.
         */
        assert_rpm_raw_wakeref_held(rpm);
        wakeref = intel_runtime_pm_get(rpm);

        for_each_power_domain(domain, mask) {
                /* Clear before put, so put's sanity check is happy. */
                async_put_domains_clear_domain(power_domains, domain);
                __intel_display_power_put_domain(dev_priv, domain);
        }

        intel_runtime_pm_put(rpm, wakeref);
}

static void
intel_display_power_put_async_work(struct work_struct *work)
{
        struct drm_i915_private *dev_priv =
                container_of(work, struct drm_i915_private,
                             power_domains.async_put_work.work);
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;
        intel_wakeref_t new_work_wakeref = intel_runtime_pm_get_raw(rpm);
        intel_wakeref_t old_work_wakeref = 0;

        mutex_lock(&power_domains->lock);

        /*
         * Bail out if all the domain refs pending to be released were grabbed
         * by subsequent gets or a flush_work.
         */
        old_work_wakeref = fetch_and_zero(&power_domains->async_put_wakeref);
        if (!old_work_wakeref)
                goto out_verify;

        release_async_put_domains(power_domains,
                                  power_domains->async_put_domains[0]);

        /* Requeue the work if more domains were async put meanwhile. */
        if (power_domains->async_put_domains[1]) {
                power_domains->async_put_domains[0] =
                        fetch_and_zero(&power_domains->async_put_domains[1]);
                queue_async_put_domains_work(power_domains,
                                             fetch_and_zero(&new_work_wakeref));
        }

out_verify:
        verify_async_put_domains_state(power_domains);

        mutex_unlock(&power_domains->lock);

        if (old_work_wakeref)
                intel_runtime_pm_put_raw(rpm, old_work_wakeref);
        if (new_work_wakeref)
                intel_runtime_pm_put_raw(rpm, new_work_wakeref);
}

/**
 * intel_display_power_put_async - release a power domain reference asynchronously
 * @i915: i915 device instance
 * @domain: power domain to reference
 * @wakeref: wakeref acquired for the reference that is being released
 *
 * This function drops the power domain reference obtained by
 * intel_display_power_get*() and schedules a work to power down the
 * corresponding hardware block if this is the last reference.
 */
void __intel_display_power_put_async(struct drm_i915_private *i915,
                                     enum intel_display_power_domain domain,
                                     intel_wakeref_t wakeref)
{
        struct i915_power_domains *power_domains = &i915->power_domains;
        struct intel_runtime_pm *rpm = &i915->runtime_pm;
        intel_wakeref_t work_wakeref = intel_runtime_pm_get_raw(rpm);

        mutex_lock(&power_domains->lock);

        if (power_domains->domain_use_count[domain] > 1) {
                __intel_display_power_put_domain(i915, domain);

                goto out_verify;
        }

        WARN_ON(power_domains->domain_use_count[domain] != 1);

        /* Let a pending work requeue itself or queue a new one. */
        if (power_domains->async_put_wakeref) {
                power_domains->async_put_domains[1] |= BIT_ULL(domain);
        } else {
                power_domains->async_put_domains[0] |= BIT_ULL(domain);
                queue_async_put_domains_work(power_domains,
                                             fetch_and_zero(&work_wakeref));
        }

out_verify:
        verify_async_put_domains_state(power_domains);

        mutex_unlock(&power_domains->lock);

        if (work_wakeref)
                intel_runtime_pm_put_raw(rpm, work_wakeref);

        intel_runtime_pm_put(rpm, wakeref);
}

/**
 * intel_display_power_flush_work - flushes the async display power disabling work
 * @i915: i915 device instance
 *
 * Flushes any pending work that was scheduled by a preceding
 * intel_display_power_put_async() call, completing the disabling of the
 * corresponding power domains.
 *
 * Note that the work handler function may still be running after this
 * function returns; to ensure that the work handler isn't running use
 * intel_display_power_flush_work_sync() instead.
 */
void intel_display_power_flush_work(struct drm_i915_private *i915)
{
        struct i915_power_domains *power_domains = &i915->power_domains;
        intel_wakeref_t work_wakeref;

        mutex_lock(&power_domains->lock);

        work_wakeref = fetch_and_zero(&power_domains->async_put_wakeref);
        if (!work_wakeref)
                goto out_verify;

        release_async_put_domains(power_domains,
                                  async_put_domains_mask(power_domains));
        cancel_delayed_work(&power_domains->async_put_work);

out_verify:
        verify_async_put_domains_state(power_domains);

        mutex_unlock(&power_domains->lock);

        if (work_wakeref)
                intel_runtime_pm_put_raw(&i915->runtime_pm, work_wakeref);
}

/**
 * intel_display_power_flush_work_sync - flushes and syncs the async display power disabling work
 * @i915: i915 device instance
 *
 * Like intel_display_power_flush_work(), but also ensure that the work
 * handler function is not running any more when this function returns.
 */
static void
intel_display_power_flush_work_sync(struct drm_i915_private *i915)
{
        struct i915_power_domains *power_domains = &i915->power_domains;

        intel_display_power_flush_work(i915);
        cancel_delayed_work_sync(&power_domains->async_put_work);

        verify_async_put_domains_state(power_domains);

        WARN_ON(power_domains->async_put_wakeref);
}

#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
/**
 * intel_display_power_put - release a power domain reference
 * @dev_priv: i915 device instance
 * @domain: power domain to reference
 * @wakeref: wakeref acquired for the reference that is being released
 *
 * This function drops the power domain reference obtained by
 * intel_display_power_get() and might power down the corresponding hardware
 * block right away if this is the last reference.
 */
void intel_display_power_put(struct drm_i915_private *dev_priv,
                             enum intel_display_power_domain domain,
                             intel_wakeref_t wakeref)
{
        __intel_display_power_put(dev_priv, domain);

        intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
}
#endif

#define I830_PIPES_POWER_DOMAINS (              \
        BIT_ULL(POWER_DOMAIN_PIPE_A) |          \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |          \
        BIT_ULL(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |    \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |    \
        BIT_ULL(POWER_DOMAIN_INIT))

#define VLV_DISPLAY_POWER_DOMAINS (             \
        BIT_ULL(POWER_DOMAIN_DISPLAY_CORE) |    \
        BIT_ULL(POWER_DOMAIN_PIPE_A) |          \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |          \
        BIT_ULL(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |    \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |    \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DSI) |                \
        BIT_ULL(POWER_DOMAIN_PORT_CRT) |                \
        BIT_ULL(POWER_DOMAIN_VGA) |                     \
        BIT_ULL(POWER_DOMAIN_AUDIO) |           \
        BIT_ULL(POWER_DOMAIN_AUX_B) |           \
        BIT_ULL(POWER_DOMAIN_AUX_C) |           \
        BIT_ULL(POWER_DOMAIN_GMBUS) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define VLV_DPIO_CMN_BC_POWER_DOMAINS (         \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_CRT) |                \
        BIT_ULL(POWER_DOMAIN_AUX_B) |           \
        BIT_ULL(POWER_DOMAIN_AUX_C) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS (  \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |        \
        BIT_ULL(POWER_DOMAIN_AUX_B) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS (  \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |        \
        BIT_ULL(POWER_DOMAIN_AUX_B) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS (  \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |        \
        BIT_ULL(POWER_DOMAIN_AUX_C) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS (  \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |        \
        BIT_ULL(POWER_DOMAIN_AUX_C) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define CHV_DISPLAY_POWER_DOMAINS (             \
        BIT_ULL(POWER_DOMAIN_DISPLAY_CORE) |    \
        BIT_ULL(POWER_DOMAIN_PIPE_A) |          \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |          \
        BIT_ULL(POWER_DOMAIN_PIPE_C) |          \
        BIT_ULL(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |    \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |    \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_C) |    \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DSI) |                \
        BIT_ULL(POWER_DOMAIN_VGA) |                     \
        BIT_ULL(POWER_DOMAIN_AUDIO) |           \
        BIT_ULL(POWER_DOMAIN_AUX_B) |           \
        BIT_ULL(POWER_DOMAIN_AUX_C) |           \
        BIT_ULL(POWER_DOMAIN_AUX_D) |           \
        BIT_ULL(POWER_DOMAIN_GMBUS) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define CHV_DPIO_CMN_BC_POWER_DOMAINS (         \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |        \
        BIT_ULL(POWER_DOMAIN_AUX_B) |           \
        BIT_ULL(POWER_DOMAIN_AUX_C) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define CHV_DPIO_CMN_D_POWER_DOMAINS (          \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) |        \
        BIT_ULL(POWER_DOMAIN_AUX_D) |           \
        BIT_ULL(POWER_DOMAIN_INIT))

#define HSW_DISPLAY_POWER_DOMAINS (                     \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |                  \
        BIT_ULL(POWER_DOMAIN_PIPE_C) |                  \
        BIT_ULL(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |            \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |            \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_C) |            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_CRT) | /* DDI E */    \
        BIT_ULL(POWER_DOMAIN_VGA) |                             \
        BIT_ULL(POWER_DOMAIN_AUDIO) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))

#define BDW_DISPLAY_POWER_DOMAINS (                     \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |                  \
        BIT_ULL(POWER_DOMAIN_PIPE_C) |                  \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |            \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |            \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_C) |            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_CRT) | /* DDI E */    \
        BIT_ULL(POWER_DOMAIN_VGA) |                             \
        BIT_ULL(POWER_DOMAIN_AUDIO) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))

#define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS (         \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_C) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_C) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_E_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                       \
        BIT_ULL(POWER_DOMAIN_AUX_C) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_D) |                   \
        BIT_ULL(POWER_DOMAIN_AUDIO) |                   \
        BIT_ULL(POWER_DOMAIN_VGA) |                             \
        BIT_ULL(POWER_DOMAIN_INIT))
#define SKL_DISPLAY_DDI_IO_A_E_POWER_DOMAINS (          \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO) |           \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_E_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define SKL_DISPLAY_DDI_IO_B_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define SKL_DISPLAY_DDI_IO_C_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define SKL_DISPLAY_DDI_IO_D_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define SKL_DISPLAY_DC_OFF_POWER_DOMAINS (              \
        SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
        BIT_ULL(POWER_DOMAIN_GT_IRQ) |                  \
        BIT_ULL(POWER_DOMAIN_MODESET) |                 \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))

#define BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS (         \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_C) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_C) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_C) |                   \
        BIT_ULL(POWER_DOMAIN_AUDIO) |                   \
        BIT_ULL(POWER_DOMAIN_VGA) |                             \
        BIT_ULL(POWER_DOMAIN_INIT))
#define BXT_DISPLAY_DC_OFF_POWER_DOMAINS (              \
        BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
        BIT_ULL(POWER_DOMAIN_GT_IRQ) |                  \
        BIT_ULL(POWER_DOMAIN_MODESET) |                 \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
        BIT_ULL(POWER_DOMAIN_GMBUS) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define BXT_DPIO_CMN_A_POWER_DOMAINS (                  \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define BXT_DPIO_CMN_BC_POWER_DOMAINS (                 \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_C) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))

#define GLK_DISPLAY_POWERWELL_2_POWER_DOMAINS (         \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_C) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_C) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                       \
        BIT_ULL(POWER_DOMAIN_AUX_C) |                   \
        BIT_ULL(POWER_DOMAIN_AUDIO) |                   \
        BIT_ULL(POWER_DOMAIN_VGA) |                             \
        BIT_ULL(POWER_DOMAIN_INIT))
#define GLK_DISPLAY_DDI_IO_A_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO))
#define GLK_DISPLAY_DDI_IO_B_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO))
#define GLK_DISPLAY_DDI_IO_C_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO))
#define GLK_DPIO_CMN_A_POWER_DOMAINS (                  \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define GLK_DPIO_CMN_B_POWER_DOMAINS (                  \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define GLK_DPIO_CMN_C_POWER_DOMAINS (                  \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_C) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define GLK_DISPLAY_AUX_A_POWER_DOMAINS (               \
        BIT_ULL(POWER_DOMAIN_AUX_A) |           \
        BIT_ULL(POWER_DOMAIN_AUX_IO_A) |                \
        BIT_ULL(POWER_DOMAIN_INIT))
#define GLK_DISPLAY_AUX_B_POWER_DOMAINS (               \
        BIT_ULL(POWER_DOMAIN_AUX_B) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define GLK_DISPLAY_AUX_C_POWER_DOMAINS (               \
        BIT_ULL(POWER_DOMAIN_AUX_C) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define GLK_DISPLAY_DC_OFF_POWER_DOMAINS (              \
        GLK_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
        BIT_ULL(POWER_DOMAIN_GT_IRQ) |                  \
        BIT_ULL(POWER_DOMAIN_MODESET) |                 \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
        BIT_ULL(POWER_DOMAIN_GMBUS) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))

#define CNL_DISPLAY_POWERWELL_2_POWER_DOMAINS (         \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_C) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_C) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |             \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) |                \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_F_LANES) |                \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                       \
        BIT_ULL(POWER_DOMAIN_AUX_C) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_D) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_F) |                   \
        BIT_ULL(POWER_DOMAIN_AUDIO) |                   \
        BIT_ULL(POWER_DOMAIN_VGA) |                             \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_DDI_A_IO_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_DDI_B_IO_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_DDI_C_IO_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_DDI_D_IO_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_AUX_A_POWER_DOMAINS (               \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_IO_A) |                \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_AUX_B_POWER_DOMAINS (               \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_AUX_C_POWER_DOMAINS (               \
        BIT_ULL(POWER_DOMAIN_AUX_C) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_AUX_D_POWER_DOMAINS (               \
        BIT_ULL(POWER_DOMAIN_AUX_D) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_AUX_F_POWER_DOMAINS (               \
        BIT_ULL(POWER_DOMAIN_AUX_F) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_DDI_F_IO_POWER_DOMAINS (            \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_F_IO) |           \
        BIT_ULL(POWER_DOMAIN_INIT))
#define CNL_DISPLAY_DC_OFF_POWER_DOMAINS (              \
        CNL_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
        BIT_ULL(POWER_DOMAIN_GT_IRQ) |                  \
        BIT_ULL(POWER_DOMAIN_MODESET) |                 \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))

/*
 * ICL PW_0/PG_0 domains (HW/DMC control):
 * - PCI
 * - clocks except port PLL
 * - central power except FBC
 * - shared functions except pipe interrupts, pipe MBUS, DBUF registers
 * ICL PW_1/PG_1 domains (HW/DMC control):
 * - DBUF function
 * - PIPE_A and its planes, except VGA
 * - transcoder EDP + PSR
 * - transcoder DSI
 * - DDI_A
 * - FBC
 */
#define ICL_PW_4_POWER_DOMAINS (                        \
        BIT_ULL(POWER_DOMAIN_PIPE_C) |                  \
        BIT_ULL(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_INIT))
        /* VDSC/joining */
#define ICL_PW_3_POWER_DOMAINS (                        \
        ICL_PW_4_POWER_DOMAINS |                        \
        BIT_ULL(POWER_DOMAIN_PIPE_B) |                  \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_A) |            \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_B) |            \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_C) |            \
        BIT_ULL(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |     \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO) |           \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO) |           \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_IO) |           \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_E_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_E_IO) |           \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_F_LANES) |        \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_F_IO) |           \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_C) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_D) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_E) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_F) |                   \
        BIT_ULL(POWER_DOMAIN_AUX_TBT1) |                \
        BIT_ULL(POWER_DOMAIN_AUX_TBT2) |                \
        BIT_ULL(POWER_DOMAIN_AUX_TBT3) |                \
        BIT_ULL(POWER_DOMAIN_AUX_TBT4) |                \
        BIT_ULL(POWER_DOMAIN_VGA) |                     \
        BIT_ULL(POWER_DOMAIN_AUDIO) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))
        /*
         * - transcoder WD
         * - KVMR (HW control)
         */
#define ICL_PW_2_POWER_DOMAINS (                        \
        ICL_PW_3_POWER_DOMAINS |                        \
        BIT_ULL(POWER_DOMAIN_TRANSCODER_EDP_VDSC) |             \
        BIT_ULL(POWER_DOMAIN_INIT))
        /*
         * - KVMR (HW control)
         */
#define ICL_DISPLAY_DC_OFF_POWER_DOMAINS (              \
        ICL_PW_2_POWER_DOMAINS |                        \
        BIT_ULL(POWER_DOMAIN_MODESET) |                 \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
        BIT_ULL(POWER_DOMAIN_INIT))

#define ICL_DDI_IO_A_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO))
#define ICL_DDI_IO_B_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO))
#define ICL_DDI_IO_C_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO))
#define ICL_DDI_IO_D_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_D_IO))
#define ICL_DDI_IO_E_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_E_IO))
#define ICL_DDI_IO_F_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_PORT_DDI_F_IO))

#define ICL_AUX_A_IO_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_AUX_IO_A) |                \
        BIT_ULL(POWER_DOMAIN_AUX_A))
#define ICL_AUX_B_IO_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_AUX_B))
#define ICL_AUX_C_IO_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_AUX_C))
#define ICL_AUX_D_IO_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_AUX_D))
#define ICL_AUX_E_IO_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_AUX_E))
#define ICL_AUX_F_IO_POWER_DOMAINS (                    \
        BIT_ULL(POWER_DOMAIN_AUX_F))
#define ICL_AUX_TBT1_IO_POWER_DOMAINS (                 \
        BIT_ULL(POWER_DOMAIN_AUX_TBT1))
#define ICL_AUX_TBT2_IO_POWER_DOMAINS (                 \
        BIT_ULL(POWER_DOMAIN_AUX_TBT2))
#define ICL_AUX_TBT3_IO_POWER_DOMAINS (                 \
        BIT_ULL(POWER_DOMAIN_AUX_TBT3))
#define ICL_AUX_TBT4_IO_POWER_DOMAINS (                 \
        BIT_ULL(POWER_DOMAIN_AUX_TBT4))

static const struct i915_power_well_ops i9xx_always_on_power_well_ops = {
        .sync_hw = i9xx_power_well_sync_hw_noop,
        .enable = i9xx_always_on_power_well_noop,
        .disable = i9xx_always_on_power_well_noop,
        .is_enabled = i9xx_always_on_power_well_enabled,
};

static const struct i915_power_well_ops chv_pipe_power_well_ops = {
        .sync_hw = i9xx_power_well_sync_hw_noop,
        .enable = chv_pipe_power_well_enable,
        .disable = chv_pipe_power_well_disable,
        .is_enabled = chv_pipe_power_well_enabled,
};

static const struct i915_power_well_ops chv_dpio_cmn_power_well_ops = {
        .sync_hw = i9xx_power_well_sync_hw_noop,
        .enable = chv_dpio_cmn_power_well_enable,
        .disable = chv_dpio_cmn_power_well_disable,
        .is_enabled = vlv_power_well_enabled,
};

static const struct i915_power_well_desc i9xx_always_on_power_well[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
};

static const struct i915_power_well_ops i830_pipes_power_well_ops = {
        .sync_hw = i830_pipes_power_well_sync_hw,
        .enable = i830_pipes_power_well_enable,
        .disable = i830_pipes_power_well_disable,
        .is_enabled = i830_pipes_power_well_enabled,
};

static const struct i915_power_well_desc i830_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "pipes",
                .domains = I830_PIPES_POWER_DOMAINS,
                .ops = &i830_pipes_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
};

static const struct i915_power_well_ops hsw_power_well_ops = {
        .sync_hw = hsw_power_well_sync_hw,
        .enable = hsw_power_well_enable,
        .disable = hsw_power_well_disable,
        .is_enabled = hsw_power_well_enabled,
};

static const struct i915_power_well_ops gen9_dc_off_power_well_ops = {
        .sync_hw = i9xx_power_well_sync_hw_noop,
        .enable = gen9_dc_off_power_well_enable,
        .disable = gen9_dc_off_power_well_disable,
        .is_enabled = gen9_dc_off_power_well_enabled,
};

static const struct i915_power_well_ops bxt_dpio_cmn_power_well_ops = {
        .sync_hw = i9xx_power_well_sync_hw_noop,
        .enable = bxt_dpio_cmn_power_well_enable,
        .disable = bxt_dpio_cmn_power_well_disable,
        .is_enabled = bxt_dpio_cmn_power_well_enabled,
};

static const struct i915_power_well_regs hsw_power_well_regs = {
        .bios   = HSW_PWR_WELL_CTL1,
        .driver = HSW_PWR_WELL_CTL2,
        .kvmr   = HSW_PWR_WELL_CTL3,
        .debug  = HSW_PWR_WELL_CTL4,
};

static const struct i915_power_well_desc hsw_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "display",
                .domains = HSW_DISPLAY_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = HSW_DISP_PW_GLOBAL,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = HSW_PW_CTL_IDX_GLOBAL,
                        .hsw.has_vga = true,
                },
        },
};

static const struct i915_power_well_desc bdw_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "display",
                .domains = BDW_DISPLAY_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = HSW_DISP_PW_GLOBAL,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = HSW_PW_CTL_IDX_GLOBAL,
                        .hsw.irq_pipe_mask = BIT(PIPE_B) | BIT(PIPE_C),
                        .hsw.has_vga = true,
                },
        },
};

static const struct i915_power_well_ops vlv_display_power_well_ops = {
        .sync_hw = i9xx_power_well_sync_hw_noop,
        .enable = vlv_display_power_well_enable,
        .disable = vlv_display_power_well_disable,
        .is_enabled = vlv_power_well_enabled,
};

static const struct i915_power_well_ops vlv_dpio_cmn_power_well_ops = {
        .sync_hw = i9xx_power_well_sync_hw_noop,
        .enable = vlv_dpio_cmn_power_well_enable,
        .disable = vlv_dpio_cmn_power_well_disable,
        .is_enabled = vlv_power_well_enabled,
};

static const struct i915_power_well_ops vlv_dpio_power_well_ops = {
        .sync_hw = i9xx_power_well_sync_hw_noop,
        .enable = vlv_power_well_enable,
        .disable = vlv_power_well_disable,
        .is_enabled = vlv_power_well_enabled,
};

static const struct i915_power_well_desc vlv_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "display",
                .domains = VLV_DISPLAY_POWER_DOMAINS,
                .ops = &vlv_display_power_well_ops,
                .id = VLV_DISP_PW_DISP2D,
                {
                        .vlv.idx = PUNIT_PWGT_IDX_DISP2D,
                },
        },
        {
                .name = "dpio-tx-b-01",
                .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
                           VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
                           VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
                           VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
                .ops = &vlv_dpio_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .vlv.idx = PUNIT_PWGT_IDX_DPIO_TX_B_LANES_01,
                },
        },
        {
                .name = "dpio-tx-b-23",
                .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
                           VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
                           VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
                           VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
                .ops = &vlv_dpio_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .vlv.idx = PUNIT_PWGT_IDX_DPIO_TX_B_LANES_23,
                },
        },
        {
                .name = "dpio-tx-c-01",
                .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
                           VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
                           VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
                           VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
                .ops = &vlv_dpio_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .vlv.idx = PUNIT_PWGT_IDX_DPIO_TX_C_LANES_01,
                },
        },
        {
                .name = "dpio-tx-c-23",
                .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
                           VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
                           VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
                           VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
                .ops = &vlv_dpio_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .vlv.idx = PUNIT_PWGT_IDX_DPIO_TX_C_LANES_23,
                },
        },
        {
                .name = "dpio-common",
                .domains = VLV_DPIO_CMN_BC_POWER_DOMAINS,
                .ops = &vlv_dpio_cmn_power_well_ops,
                .id = VLV_DISP_PW_DPIO_CMN_BC,
                {
                        .vlv.idx = PUNIT_PWGT_IDX_DPIO_CMN_BC,
                },
        },
};

static const struct i915_power_well_desc chv_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "display",
                /*
                 * Pipe A power well is the new disp2d well. Pipe B and C
                 * power wells don't actually exist. Pipe A power well is
                 * required for any pipe to work.
                 */
                .domains = CHV_DISPLAY_POWER_DOMAINS,
                .ops = &chv_pipe_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "dpio-common-bc",
                .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS,
                .ops = &chv_dpio_cmn_power_well_ops,
                .id = VLV_DISP_PW_DPIO_CMN_BC,
                {
                        .vlv.idx = PUNIT_PWGT_IDX_DPIO_CMN_BC,
                },
        },
        {
                .name = "dpio-common-d",
                .domains = CHV_DPIO_CMN_D_POWER_DOMAINS,
                .ops = &chv_dpio_cmn_power_well_ops,
                .id = CHV_DISP_PW_DPIO_CMN_D,
                {
                        .vlv.idx = PUNIT_PWGT_IDX_DPIO_CMN_D,
                },
        },
};

bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
                                         enum i915_power_well_id power_well_id)
{
        struct i915_power_well *power_well;
        bool ret;

        power_well = lookup_power_well(dev_priv, power_well_id);
        ret = power_well->desc->ops->is_enabled(dev_priv, power_well);

        return ret;
}

static const struct i915_power_well_desc skl_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 1",
                /* Handled by the DMC firmware */
                .always_on = true,
                .domains = 0,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_1,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_PW_1,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "MISC IO power well",
                /* Handled by the DMC firmware */
                .always_on = true,
                .domains = 0,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_MISC_IO,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_MISC_IO,
                },
        },
        {
                .name = "DC off",
                .domains = SKL_DISPLAY_DC_OFF_POWER_DOMAINS,
                .ops = &gen9_dc_off_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 2",
                .domains = SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_2,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_PW_2,
                        .hsw.irq_pipe_mask = BIT(PIPE_B) | BIT(PIPE_C),
                        .hsw.has_vga = true,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "DDI A/E IO power well",
                .domains = SKL_DISPLAY_DDI_IO_A_E_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_A_E,
                },
        },
        {
                .name = "DDI B IO power well",
                .domains = SKL_DISPLAY_DDI_IO_B_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_B,
                },
        },
        {
                .name = "DDI C IO power well",
                .domains = SKL_DISPLAY_DDI_IO_C_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_C,
                },
        },
        {
                .name = "DDI D IO power well",
                .domains = SKL_DISPLAY_DDI_IO_D_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_D,
                },
        },
};

static const struct i915_power_well_desc bxt_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 1",
                /* Handled by the DMC firmware */
                .always_on = true,
                .domains = 0,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_1,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_PW_1,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "DC off",
                .domains = BXT_DISPLAY_DC_OFF_POWER_DOMAINS,
                .ops = &gen9_dc_off_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 2",
                .domains = BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_2,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_PW_2,
                        .hsw.irq_pipe_mask = BIT(PIPE_B) | BIT(PIPE_C),
                        .hsw.has_vga = true,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "dpio-common-a",
                .domains = BXT_DPIO_CMN_A_POWER_DOMAINS,
                .ops = &bxt_dpio_cmn_power_well_ops,
                .id = BXT_DISP_PW_DPIO_CMN_A,
                {
                        .bxt.phy = DPIO_PHY1,
                },
        },
        {
                .name = "dpio-common-bc",
                .domains = BXT_DPIO_CMN_BC_POWER_DOMAINS,
                .ops = &bxt_dpio_cmn_power_well_ops,
                .id = VLV_DISP_PW_DPIO_CMN_BC,
                {
                        .bxt.phy = DPIO_PHY0,
                },
        },
};

static const struct i915_power_well_desc glk_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 1",
                /* Handled by the DMC firmware */
                .always_on = true,
                .domains = 0,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_1,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_PW_1,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "DC off",
                .domains = GLK_DISPLAY_DC_OFF_POWER_DOMAINS,
                .ops = &gen9_dc_off_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 2",
                .domains = GLK_DISPLAY_POWERWELL_2_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_2,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_PW_2,
                        .hsw.irq_pipe_mask = BIT(PIPE_B) | BIT(PIPE_C),
                        .hsw.has_vga = true,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "dpio-common-a",
                .domains = GLK_DPIO_CMN_A_POWER_DOMAINS,
                .ops = &bxt_dpio_cmn_power_well_ops,
                .id = BXT_DISP_PW_DPIO_CMN_A,
                {
                        .bxt.phy = DPIO_PHY1,
                },
        },
        {
                .name = "dpio-common-b",
                .domains = GLK_DPIO_CMN_B_POWER_DOMAINS,
                .ops = &bxt_dpio_cmn_power_well_ops,
                .id = VLV_DISP_PW_DPIO_CMN_BC,
                {
                        .bxt.phy = DPIO_PHY0,
                },
        },
        {
                .name = "dpio-common-c",
                .domains = GLK_DPIO_CMN_C_POWER_DOMAINS,
                .ops = &bxt_dpio_cmn_power_well_ops,
                .id = GLK_DISP_PW_DPIO_CMN_C,
                {
                        .bxt.phy = DPIO_PHY2,
                },
        },
        {
                .name = "AUX A",
                .domains = GLK_DISPLAY_AUX_A_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = GLK_PW_CTL_IDX_AUX_A,
                },
        },
        {
                .name = "AUX B",
                .domains = GLK_DISPLAY_AUX_B_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = GLK_PW_CTL_IDX_AUX_B,
                },
        },
        {
                .name = "AUX C",
                .domains = GLK_DISPLAY_AUX_C_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = GLK_PW_CTL_IDX_AUX_C,
                },
        },
        {
                .name = "DDI A IO power well",
                .domains = GLK_DISPLAY_DDI_IO_A_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = GLK_PW_CTL_IDX_DDI_A,
                },
        },
        {
                .name = "DDI B IO power well",
                .domains = GLK_DISPLAY_DDI_IO_B_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_B,
                },
        },
        {
                .name = "DDI C IO power well",
                .domains = GLK_DISPLAY_DDI_IO_C_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_C,
                },
        },
};

static const struct i915_power_well_desc cnl_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 1",
                /* Handled by the DMC firmware */
                .always_on = true,
                .domains = 0,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_1,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_PW_1,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "AUX A",
                .domains = CNL_DISPLAY_AUX_A_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = GLK_PW_CTL_IDX_AUX_A,
                },
        },
        {
                .name = "AUX B",
                .domains = CNL_DISPLAY_AUX_B_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {

                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = GLK_PW_CTL_IDX_AUX_B,
                },
        },
        {
                .name = "AUX C",
                .domains = CNL_DISPLAY_AUX_C_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = GLK_PW_CTL_IDX_AUX_C,
                },
        },
        {
                .name = "AUX D",
                .domains = CNL_DISPLAY_AUX_D_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = CNL_PW_CTL_IDX_AUX_D,
                },
        },
        {
                .name = "DC off",
                .domains = CNL_DISPLAY_DC_OFF_POWER_DOMAINS,
                .ops = &gen9_dc_off_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 2",
                .domains = CNL_DISPLAY_POWERWELL_2_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_2,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_PW_2,
                        .hsw.irq_pipe_mask = BIT(PIPE_B) | BIT(PIPE_C),
                        .hsw.has_vga = true,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "DDI A IO power well",
                .domains = CNL_DISPLAY_DDI_A_IO_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = GLK_PW_CTL_IDX_DDI_A,
                },
        },
        {
                .name = "DDI B IO power well",
                .domains = CNL_DISPLAY_DDI_B_IO_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_B,
                },
        },
        {
                .name = "DDI C IO power well",
                .domains = CNL_DISPLAY_DDI_C_IO_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_C,
                },
        },
        {
                .name = "DDI D IO power well",
                .domains = CNL_DISPLAY_DDI_D_IO_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = SKL_PW_CTL_IDX_DDI_D,
                },
        },
        {
                .name = "DDI F IO power well",
                .domains = CNL_DISPLAY_DDI_F_IO_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = CNL_PW_CTL_IDX_DDI_F,
                },
        },
        {
                .name = "AUX F",
                .domains = CNL_DISPLAY_AUX_F_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = CNL_PW_CTL_IDX_AUX_F,
                },
        },
};

static const struct i915_power_well_ops icl_combo_phy_aux_power_well_ops = {
        .sync_hw = hsw_power_well_sync_hw,
        .enable = icl_combo_phy_aux_power_well_enable,
        .disable = icl_combo_phy_aux_power_well_disable,
        .is_enabled = hsw_power_well_enabled,
};

static const struct i915_power_well_ops icl_tc_phy_aux_power_well_ops = {
        .sync_hw = hsw_power_well_sync_hw,
        .enable = icl_tc_phy_aux_power_well_enable,
        .disable = hsw_power_well_disable,
        .is_enabled = hsw_power_well_enabled,
};

static const struct i915_power_well_regs icl_aux_power_well_regs = {
        .bios   = ICL_PWR_WELL_CTL_AUX1,
        .driver = ICL_PWR_WELL_CTL_AUX2,
        .debug  = ICL_PWR_WELL_CTL_AUX4,
};

static const struct i915_power_well_regs icl_ddi_power_well_regs = {
        .bios   = ICL_PWR_WELL_CTL_DDI1,
        .driver = ICL_PWR_WELL_CTL_DDI2,
        .debug  = ICL_PWR_WELL_CTL_DDI4,
};

static const struct i915_power_well_desc icl_power_wells[] = {
        {
                .name = "always-on",
                .always_on = true,
                .domains = POWER_DOMAIN_MASK,
                .ops = &i9xx_always_on_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 1",
                /* Handled by the DMC firmware */
                .always_on = true,
                .domains = 0,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_1,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_PW_1,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "DC off",
                .domains = ICL_DISPLAY_DC_OFF_POWER_DOMAINS,
                .ops = &gen9_dc_off_power_well_ops,
                .id = DISP_PW_ID_NONE,
        },
        {
                .name = "power well 2",
                .domains = ICL_PW_2_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = SKL_DISP_PW_2,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_PW_2,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "power well 3",
                .domains = ICL_PW_3_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_PW_3,
                        .hsw.irq_pipe_mask = BIT(PIPE_B),
                        .hsw.has_vga = true,
                        .hsw.has_fuses = true,
                },
        },
        {
                .name = "DDI A IO",
                .domains = ICL_DDI_IO_A_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_ddi_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_DDI_A,
                },
        },
        {
                .name = "DDI B IO",
                .domains = ICL_DDI_IO_B_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_ddi_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_DDI_B,
                },
        },
        {
                .name = "DDI C IO",
                .domains = ICL_DDI_IO_C_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_ddi_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_DDI_C,
                },
        },
        {
                .name = "DDI D IO",
                .domains = ICL_DDI_IO_D_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_ddi_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_DDI_D,
                },
        },
        {
                .name = "DDI E IO",
                .domains = ICL_DDI_IO_E_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_ddi_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_DDI_E,
                },
        },
        {
                .name = "DDI F IO",
                .domains = ICL_DDI_IO_F_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_ddi_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_DDI_F,
                },
        },
        {
                .name = "AUX A",
                .domains = ICL_AUX_A_IO_POWER_DOMAINS,
                .ops = &icl_combo_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_A,
                },
        },
        {
                .name = "AUX B",
                .domains = ICL_AUX_B_IO_POWER_DOMAINS,
                .ops = &icl_combo_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_B,
                },
        },
        {
                .name = "AUX C",
                .domains = ICL_AUX_C_IO_POWER_DOMAINS,
                .ops = &icl_tc_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_C,
                        .hsw.is_tc_tbt = false,
                },
        },
        {
                .name = "AUX D",
                .domains = ICL_AUX_D_IO_POWER_DOMAINS,
                .ops = &icl_tc_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_D,
                        .hsw.is_tc_tbt = false,
                },
        },
        {
                .name = "AUX E",
                .domains = ICL_AUX_E_IO_POWER_DOMAINS,
                .ops = &icl_tc_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_E,
                        .hsw.is_tc_tbt = false,
                },
        },
        {
                .name = "AUX F",
                .domains = ICL_AUX_F_IO_POWER_DOMAINS,
                .ops = &icl_tc_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_F,
                        .hsw.is_tc_tbt = false,
                },
        },
        {
                .name = "AUX TBT1",
                .domains = ICL_AUX_TBT1_IO_POWER_DOMAINS,
                .ops = &icl_tc_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_TBT1,
                        .hsw.is_tc_tbt = true,
                },
        },
        {
                .name = "AUX TBT2",
                .domains = ICL_AUX_TBT2_IO_POWER_DOMAINS,
                .ops = &icl_tc_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_TBT2,
                        .hsw.is_tc_tbt = true,
                },
        },
        {
                .name = "AUX TBT3",
                .domains = ICL_AUX_TBT3_IO_POWER_DOMAINS,
                .ops = &icl_tc_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_TBT3,
                        .hsw.is_tc_tbt = true,
                },
        },
        {
                .name = "AUX TBT4",
                .domains = ICL_AUX_TBT4_IO_POWER_DOMAINS,
                .ops = &icl_tc_phy_aux_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &icl_aux_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_AUX_TBT4,
                        .hsw.is_tc_tbt = true,
                },
        },
        {
                .name = "power well 4",
                .domains = ICL_PW_4_POWER_DOMAINS,
                .ops = &hsw_power_well_ops,
                .id = DISP_PW_ID_NONE,
                {
                        .hsw.regs = &hsw_power_well_regs,
                        .hsw.idx = ICL_PW_CTL_IDX_PW_4,
                        .hsw.has_fuses = true,
                        .hsw.irq_pipe_mask = BIT(PIPE_C),
                },
        },
};

static int
sanitize_disable_power_well_option(const struct drm_i915_private *dev_priv,
                                   int disable_power_well)
{
        if (disable_power_well >= 0)
                return !!disable_power_well;

        return 1;
}

static u32 get_allowed_dc_mask(const struct drm_i915_private *dev_priv,
                               int enable_dc)
{
        u32 mask;
        int requested_dc;
        int max_dc;

        if (INTEL_GEN(dev_priv) >= 11) {
                max_dc = 2;
                /*
                 * DC9 has a separate HW flow from the rest of the DC states,
                 * not depending on the DMC firmware. It's needed by system
                 * suspend/resume, so allow it unconditionally.
                 */
                mask = DC_STATE_EN_DC9;
        } else if (IS_GEN(dev_priv, 10) || IS_GEN9_BC(dev_priv)) {
                max_dc = 2;
                mask = 0;
        } else if (IS_GEN9_LP(dev_priv)) {
                max_dc = 1;
                mask = DC_STATE_EN_DC9;
        } else {
                max_dc = 0;
                mask = 0;
        }

        if (!i915_modparams.disable_power_well)
                max_dc = 0;

        if (enable_dc >= 0 && enable_dc <= max_dc) {
                requested_dc = enable_dc;
        } else if (enable_dc == -1) {
                requested_dc = max_dc;
        } else if (enable_dc > max_dc && enable_dc <= 2) {
                DRM_DEBUG_KMS("Adjusting requested max DC state (%d->%d)\n",
                              enable_dc, max_dc);
                requested_dc = max_dc;
        } else {
                DRM_ERROR("Unexpected value for enable_dc (%d)\n", enable_dc);
                requested_dc = max_dc;
        }

        if (requested_dc > 1)
                mask |= DC_STATE_EN_UPTO_DC6;
        if (requested_dc > 0)
                mask |= DC_STATE_EN_UPTO_DC5;

        DRM_DEBUG_KMS("Allowed DC state mask %02x\n", mask);

        return mask;
}

static int
__set_power_wells(struct i915_power_domains *power_domains,
                  const struct i915_power_well_desc *power_well_descs,
                  int power_well_count)
{
        u64 power_well_ids = 0;
        int i;

        power_domains->power_well_count = power_well_count;
        power_domains->power_wells =
                                kcalloc(power_well_count,
                                        sizeof(*power_domains->power_wells),
                                        GFP_KERNEL);
        if (!power_domains->power_wells)
                return -ENOMEM;

        for (i = 0; i < power_well_count; i++) {
                enum i915_power_well_id id = power_well_descs[i].id;

                power_domains->power_wells[i].desc = &power_well_descs[i];

                if (id == DISP_PW_ID_NONE)
                        continue;

                WARN_ON(id >= sizeof(power_well_ids) * 8);
                WARN_ON(power_well_ids & BIT_ULL(id));
                power_well_ids |= BIT_ULL(id);
        }

        return 0;
}

#define set_power_wells(power_domains, __power_well_descs) \
        __set_power_wells(power_domains, __power_well_descs, \
                          ARRAY_SIZE(__power_well_descs))

/**
 * intel_power_domains_init - initializes the power domain structures
 * @dev_priv: i915 device instance
 *
 * Initializes the power domain structures for @dev_priv depending upon the
 * supported platform.
 */
int intel_power_domains_init(struct drm_i915_private *dev_priv)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        int err;

        i915_modparams.disable_power_well =
                sanitize_disable_power_well_option(dev_priv,
                                                   i915_modparams.disable_power_well);
        dev_priv->csr.allowed_dc_mask =
                get_allowed_dc_mask(dev_priv, i915_modparams.enable_dc);

        BUILD_BUG_ON(POWER_DOMAIN_NUM > 64);

        mutex_init(&power_domains->lock);

        INIT_DELAYED_WORK(&power_domains->async_put_work,
                          intel_display_power_put_async_work);

        /*
         * The enabling order will be from lower to higher indexed wells,
         * the disabling order is reversed.
         */
        if (IS_GEN(dev_priv, 11)) {
                err = set_power_wells(power_domains, icl_power_wells);
        } else if (IS_CANNONLAKE(dev_priv)) {
                err = set_power_wells(power_domains, cnl_power_wells);

                /*
                 * DDI and Aux IO are getting enabled for all ports
                 * regardless the presence or use. So, in order to avoid
                 * timeouts, lets remove them from the list
                 * for the SKUs without port F.
                 */
                if (!IS_CNL_WITH_PORT_F(dev_priv))
                        power_domains->power_well_count -= 2;
        } else if (IS_GEMINILAKE(dev_priv)) {
                err = set_power_wells(power_domains, glk_power_wells);
        } else if (IS_BROXTON(dev_priv)) {
                err = set_power_wells(power_domains, bxt_power_wells);
        } else if (IS_GEN9_BC(dev_priv)) {
                err = set_power_wells(power_domains, skl_power_wells);
        } else if (IS_CHERRYVIEW(dev_priv)) {
                err = set_power_wells(power_domains, chv_power_wells);
        } else if (IS_BROADWELL(dev_priv)) {
                err = set_power_wells(power_domains, bdw_power_wells);
        } else if (IS_HASWELL(dev_priv)) {
                err = set_power_wells(power_domains, hsw_power_wells);
        } else if (IS_VALLEYVIEW(dev_priv)) {
                err = set_power_wells(power_domains, vlv_power_wells);
        } else if (IS_I830(dev_priv)) {
                err = set_power_wells(power_domains, i830_power_wells);
        } else {
                err = set_power_wells(power_domains, i9xx_always_on_power_well);
        }

        return err;
}

/**
 * intel_power_domains_cleanup - clean up power domains resources
 * @dev_priv: i915 device instance
 *
 * Release any resources acquired by intel_power_domains_init()
 */
void intel_power_domains_cleanup(struct drm_i915_private *dev_priv)
{
        kfree(dev_priv->power_domains.power_wells);
}

static void intel_power_domains_sync_hw(struct drm_i915_private *dev_priv)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        struct i915_power_well *power_well;

        mutex_lock(&power_domains->lock);
        for_each_power_well(dev_priv, power_well) {
                power_well->desc->ops->sync_hw(dev_priv, power_well);
                power_well->hw_enabled =
                        power_well->desc->ops->is_enabled(dev_priv, power_well);
        }
        mutex_unlock(&power_domains->lock);
}

static inline
bool intel_dbuf_slice_set(struct drm_i915_private *dev_priv,
                          i915_reg_t reg, bool enable)
{
        u32 val, status;

        val = I915_READ(reg);
        val = enable ? (val | DBUF_POWER_REQUEST) : (val & ~DBUF_POWER_REQUEST);
        I915_WRITE(reg, val);
        POSTING_READ(reg);
        udelay(10);

        status = I915_READ(reg) & DBUF_POWER_STATE;
        if ((enable && !status) || (!enable && status)) {
                DRM_ERROR("DBus power %s timeout!\n",
                          enable ? "enable" : "disable");
                return false;
        }
        return true;
}

static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
{
        intel_dbuf_slice_set(dev_priv, DBUF_CTL, true);
}

static void gen9_dbuf_disable(struct drm_i915_private *dev_priv)
{
        intel_dbuf_slice_set(dev_priv, DBUF_CTL, false);
}

static u8 intel_dbuf_max_slices(struct drm_i915_private *dev_priv)
{
        if (INTEL_GEN(dev_priv) < 11)
                return 1;
        return 2;
}

void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
                            u8 req_slices)
{
        const u8 hw_enabled_slices = dev_priv->wm.skl_hw.ddb.enabled_slices;
        bool ret;

        if (req_slices > intel_dbuf_max_slices(dev_priv)) {
                DRM_ERROR("Invalid number of dbuf slices requested\n");
                return;
        }

        if (req_slices == hw_enabled_slices || req_slices == 0)
                return;

        if (req_slices > hw_enabled_slices)
                ret = intel_dbuf_slice_set(dev_priv, DBUF_CTL_S2, true);
        else
                ret = intel_dbuf_slice_set(dev_priv, DBUF_CTL_S2, false);

        if (ret)
                dev_priv->wm.skl_hw.ddb.enabled_slices = req_slices;
}

static void icl_dbuf_enable(struct drm_i915_private *dev_priv)
{
        I915_WRITE(DBUF_CTL_S1, I915_READ(DBUF_CTL_S1) | DBUF_POWER_REQUEST);
        I915_WRITE(DBUF_CTL_S2, I915_READ(DBUF_CTL_S2) | DBUF_POWER_REQUEST);
        POSTING_READ(DBUF_CTL_S2);

        udelay(10);

        if (!(I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE) ||
            !(I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE))
                DRM_ERROR("DBuf power enable timeout\n");
        else
                /*
                 * FIXME: for now pretend that we only have 1 slice, see
                 * intel_enabled_dbuf_slices_num().
                 */
                dev_priv->wm.skl_hw.ddb.enabled_slices = 1;
}

static void icl_dbuf_disable(struct drm_i915_private *dev_priv)
{
        I915_WRITE(DBUF_CTL_S1, I915_READ(DBUF_CTL_S1) & ~DBUF_POWER_REQUEST);
        I915_WRITE(DBUF_CTL_S2, I915_READ(DBUF_CTL_S2) & ~DBUF_POWER_REQUEST);
        POSTING_READ(DBUF_CTL_S2);

        udelay(10);

        if ((I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE) ||
            (I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE))
                DRM_ERROR("DBuf power disable timeout!\n");
        else
                /*
                 * FIXME: for now pretend that the first slice is always
                 * enabled, see intel_enabled_dbuf_slices_num().
                 */
                dev_priv->wm.skl_hw.ddb.enabled_slices = 1;
}

static void icl_mbus_init(struct drm_i915_private *dev_priv)
{
        u32 val;

        val = MBUS_ABOX_BT_CREDIT_POOL1(16) |
              MBUS_ABOX_BT_CREDIT_POOL2(16) |
              MBUS_ABOX_B_CREDIT(1) |
              MBUS_ABOX_BW_CREDIT(1);

        I915_WRITE(MBUS_ABOX_CTL, val);
}

static void hsw_assert_cdclk(struct drm_i915_private *dev_priv)
{
        u32 val = I915_READ(LCPLL_CTL);

        /*
         * The LCPLL register should be turned on by the BIOS. For now
         * let's just check its state and print errors in case
         * something is wrong.  Don't even try to turn it on.
         */

        if (val & LCPLL_CD_SOURCE_FCLK)
                DRM_ERROR("CDCLK source is not LCPLL\n");

        if (val & LCPLL_PLL_DISABLE)
                DRM_ERROR("LCPLL is disabled\n");

        if ((val & LCPLL_REF_MASK) != LCPLL_REF_NON_SSC)
                DRM_ERROR("LCPLL not using non-SSC reference\n");
}

static void assert_can_disable_lcpll(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct intel_crtc *crtc;

        for_each_intel_crtc(dev, crtc)
                I915_STATE_WARN(crtc->active, "CRTC for pipe %c enabled\n",
                                pipe_name(crtc->pipe));

        I915_STATE_WARN(I915_READ(HSW_PWR_WELL_CTL2),
                        "Display power well on\n");
        I915_STATE_WARN(I915_READ(SPLL_CTL) & SPLL_PLL_ENABLE,
                        "SPLL enabled\n");
        I915_STATE_WARN(I915_READ(WRPLL_CTL(0)) & WRPLL_PLL_ENABLE,
                        "WRPLL1 enabled\n");
        I915_STATE_WARN(I915_READ(WRPLL_CTL(1)) & WRPLL_PLL_ENABLE,
                        "WRPLL2 enabled\n");
        I915_STATE_WARN(I915_READ(PP_STATUS(0)) & PP_ON,
                        "Panel power on\n");
        I915_STATE_WARN(I915_READ(BLC_PWM_CPU_CTL2) & BLM_PWM_ENABLE,
                        "CPU PWM1 enabled\n");
        if (IS_HASWELL(dev_priv))
                I915_STATE_WARN(I915_READ(HSW_BLC_PWM2_CTL) & BLM_PWM_ENABLE,
                                "CPU PWM2 enabled\n");
        I915_STATE_WARN(I915_READ(BLC_PWM_PCH_CTL1) & BLM_PCH_PWM_ENABLE,
                        "PCH PWM1 enabled\n");
        I915_STATE_WARN(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
                        "Utility pin enabled\n");
        I915_STATE_WARN(I915_READ(PCH_GTC_CTL) & PCH_GTC_ENABLE,
                        "PCH GTC enabled\n");

        /*
         * In theory we can still leave IRQs enabled, as long as only the HPD
         * interrupts remain enabled. We used to check for that, but since it's
         * gen-specific and since we only disable LCPLL after we fully disable
         * the interrupts, the check below should be enough.
         */
        I915_STATE_WARN(intel_irqs_enabled(dev_priv), "IRQs enabled\n");
}

static u32 hsw_read_dcomp(struct drm_i915_private *dev_priv)
{
        if (IS_HASWELL(dev_priv))
                return I915_READ(D_COMP_HSW);
        else
                return I915_READ(D_COMP_BDW);
}

static void hsw_write_dcomp(struct drm_i915_private *dev_priv, u32 val)
{
        if (IS_HASWELL(dev_priv)) {
                if (sandybridge_pcode_write(dev_priv,
                                            GEN6_PCODE_WRITE_D_COMP, val))
                        DRM_DEBUG_KMS("Failed to write to D_COMP\n");
        } else {
                I915_WRITE(D_COMP_BDW, val);
                POSTING_READ(D_COMP_BDW);
        }
}

/*
 * This function implements pieces of two sequences from BSpec:
 * - Sequence for display software to disable LCPLL
 * - Sequence for display software to allow package C8+
 * The steps implemented here are just the steps that actually touch the LCPLL
 * register. Callers should take care of disabling all the display engine
 * functions, doing the mode unset, fixing interrupts, etc.
 */
static void hsw_disable_lcpll(struct drm_i915_private *dev_priv,
                              bool switch_to_fclk, bool allow_power_down)
{
        u32 val;

        assert_can_disable_lcpll(dev_priv);

        val = I915_READ(LCPLL_CTL);

        if (switch_to_fclk) {
                val |= LCPLL_CD_SOURCE_FCLK;
                I915_WRITE(LCPLL_CTL, val);

                if (wait_for_us(I915_READ(LCPLL_CTL) &
                                LCPLL_CD_SOURCE_FCLK_DONE, 1))
                        DRM_ERROR("Switching to FCLK failed\n");

                val = I915_READ(LCPLL_CTL);
        }

        val |= LCPLL_PLL_DISABLE;
        I915_WRITE(LCPLL_CTL, val);
        POSTING_READ(LCPLL_CTL);

        if (intel_wait_for_register(&dev_priv->uncore, LCPLL_CTL,
                                    LCPLL_PLL_LOCK, 0, 1))
                DRM_ERROR("LCPLL still locked\n");

        val = hsw_read_dcomp(dev_priv);
        val |= D_COMP_COMP_DISABLE;
        hsw_write_dcomp(dev_priv, val);
        ndelay(100);

        if (wait_for((hsw_read_dcomp(dev_priv) &
                      D_COMP_RCOMP_IN_PROGRESS) == 0, 1))
                DRM_ERROR("D_COMP RCOMP still in progress\n");

        if (allow_power_down) {
                val = I915_READ(LCPLL_CTL);
                val |= LCPLL_POWER_DOWN_ALLOW;
                I915_WRITE(LCPLL_CTL, val);
                POSTING_READ(LCPLL_CTL);
        }
}

/*
 * Fully restores LCPLL, disallowing power down and switching back to LCPLL
 * source.
 */
static void hsw_restore_lcpll(struct drm_i915_private *dev_priv)
{
        u32 val;

        val = I915_READ(LCPLL_CTL);

        if ((val & (LCPLL_PLL_LOCK | LCPLL_PLL_DISABLE | LCPLL_CD_SOURCE_FCLK |
                    LCPLL_POWER_DOWN_ALLOW)) == LCPLL_PLL_LOCK)
                return;

        /*
         * Make sure we're not on PC8 state before disabling PC8, otherwise
         * we'll hang the machine. To prevent PC8 state, just enable force_wake.
         */
        intel_uncore_forcewake_get(&dev_priv->uncore, FORCEWAKE_ALL);

        if (val & LCPLL_POWER_DOWN_ALLOW) {
                val &= ~LCPLL_POWER_DOWN_ALLOW;
                I915_WRITE(LCPLL_CTL, val);
                POSTING_READ(LCPLL_CTL);
        }

        val = hsw_read_dcomp(dev_priv);
        val |= D_COMP_COMP_FORCE;
        val &= ~D_COMP_COMP_DISABLE;
        hsw_write_dcomp(dev_priv, val);

        val = I915_READ(LCPLL_CTL);
        val &= ~LCPLL_PLL_DISABLE;
        I915_WRITE(LCPLL_CTL, val);

        if (intel_wait_for_register(&dev_priv->uncore, LCPLL_CTL,
                                    LCPLL_PLL_LOCK, LCPLL_PLL_LOCK, 5))
                DRM_ERROR("LCPLL not locked yet\n");

        if (val & LCPLL_CD_SOURCE_FCLK) {
                val = I915_READ(LCPLL_CTL);
                val &= ~LCPLL_CD_SOURCE_FCLK;
                I915_WRITE(LCPLL_CTL, val);

                if (wait_for_us((I915_READ(LCPLL_CTL) &
                                 LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
                        DRM_ERROR("Switching back to LCPLL failed\n");
        }

        intel_uncore_forcewake_put(&dev_priv->uncore, FORCEWAKE_ALL);

        intel_update_cdclk(dev_priv);
        intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
}

/*
 * Package states C8 and deeper are really deep PC states that can only be
 * reached when all the devices on the system allow it, so even if the graphics
 * device allows PC8+, it doesn't mean the system will actually get to these
 * states. Our driver only allows PC8+ when going into runtime PM.
 *
 * The requirements for PC8+ are that all the outputs are disabled, the power
 * well is disabled and most interrupts are disabled, and these are also
 * requirements for runtime PM. When these conditions are met, we manually do
 * the other conditions: disable the interrupts, clocks and switch LCPLL refclk
 * to Fclk. If we're in PC8+ and we get an non-hotplug interrupt, we can hard
 * hang the machine.
 *
 * When we really reach PC8 or deeper states (not just when we allow it) we lose
 * the state of some registers, so when we come back from PC8+ we need to
 * restore this state. We don't get into PC8+ if we're not in RC6, so we don't
 * need to take care of the registers kept by RC6. Notice that this happens even
 * if we don't put the device in PCI D3 state (which is what currently happens
 * because of the runtime PM support).
 *
 * For more, read "Display Sequences for Package C8" on the hardware
 * documentation.
 */
void hsw_enable_pc8(struct drm_i915_private *dev_priv)
{
        u32 val;

        DRM_DEBUG_KMS("Enabling package C8+\n");

        if (HAS_PCH_LPT_LP(dev_priv)) {
                val = I915_READ(SOUTH_DSPCLK_GATE_D);
                val &= ~PCH_LP_PARTITION_LEVEL_DISABLE;
                I915_WRITE(SOUTH_DSPCLK_GATE_D, val);
        }

        lpt_disable_clkout_dp(dev_priv);
        hsw_disable_lcpll(dev_priv, true, true);
}

void hsw_disable_pc8(struct drm_i915_private *dev_priv)
{
        u32 val;

        DRM_DEBUG_KMS("Disabling package C8+\n");

        hsw_restore_lcpll(dev_priv);
        intel_init_pch_refclk(dev_priv);

        if (HAS_PCH_LPT_LP(dev_priv)) {
                val = I915_READ(SOUTH_DSPCLK_GATE_D);
                val |= PCH_LP_PARTITION_LEVEL_DISABLE;
                I915_WRITE(SOUTH_DSPCLK_GATE_D, val);
        }
}

static void intel_pch_reset_handshake(struct drm_i915_private *dev_priv,
                                      bool enable)
{
        i915_reg_t reg;
        u32 reset_bits, val;

        if (IS_IVYBRIDGE(dev_priv)) {
                reg = GEN7_MSG_CTL;
                reset_bits = WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK;
        } else {
                reg = HSW_NDE_RSTWRN_OPT;
                reset_bits = RESET_PCH_HANDSHAKE_ENABLE;
        }

        val = I915_READ(reg);

        if (enable)
                val |= reset_bits;
        else
                val &= ~reset_bits;

        I915_WRITE(reg, val);
}

static void skl_display_core_init(struct drm_i915_private *dev_priv,
                                  bool resume)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        struct i915_power_well *well;

        gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);

        /* enable PCH reset handshake */
        intel_pch_reset_handshake(dev_priv, !HAS_PCH_NOP(dev_priv));

        /* enable PG1 and Misc I/O */
        mutex_lock(&power_domains->lock);

        well = lookup_power_well(dev_priv, SKL_DISP_PW_1);
        intel_power_well_enable(dev_priv, well);

        well = lookup_power_well(dev_priv, SKL_DISP_PW_MISC_IO);
        intel_power_well_enable(dev_priv, well);

        mutex_unlock(&power_domains->lock);

        intel_cdclk_init(dev_priv);

        gen9_dbuf_enable(dev_priv);

        if (resume && dev_priv->csr.dmc_payload)
                intel_csr_load_program(dev_priv);
}

static void skl_display_core_uninit(struct drm_i915_private *dev_priv)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        struct i915_power_well *well;

        gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);

        gen9_dbuf_disable(dev_priv);

        intel_cdclk_uninit(dev_priv);

        /* The spec doesn't call for removing the reset handshake flag */
        /* disable PG1 and Misc I/O */

        mutex_lock(&power_domains->lock);

        /*
         * BSpec says to keep the MISC IO power well enabled here, only
         * remove our request for power well 1.
         * Note that even though the driver's request is removed power well 1
         * may stay enabled after this due to DMC's own request on it.
         */
        well = lookup_power_well(dev_priv, SKL_DISP_PW_1);
        intel_power_well_disable(dev_priv, well);

        mutex_unlock(&power_domains->lock);

        usleep_range(10, 30);           /* 10 us delay per Bspec */
}

void bxt_display_core_init(struct drm_i915_private *dev_priv,
                           bool resume)
{
        struct i915_power_domains *power_domains = &dev_priv->power_domains;
        struct i915_power_well *well;

        gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);

        /*
         * NDE_RSTWRN_OPT RST PCH Handshake En must always be 0b on BXT