/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
 */
/*
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/circ_buf.h>
#include <linux/slab.h>
#include <linux/sysrq.h>

#include <drm/drm_drv.h>
#include <drm/drm_irq.h>

#include "display/intel_display_types.h"
#include "display/intel_fifo_underrun.h"
#include "display/intel_hotplug.h"
#include "display/intel_lpe_audio.h"
#include "display/intel_psr.h"

#include "gt/intel_gt.h"
#include "gt/intel_gt_irq.h"
#include "gt/intel_gt_pm_irq.h"
#include "gt/intel_rps.h"

#include "i915_drv.h"
#include "i915_irq.h"
#include "i915_trace.h"
#include "intel_pm.h"

/**
 * DOC: interrupt handling
 *
 * These functions provide the basic support for enabling and disabling the
 * interrupt handling support. There's a lot more functionality in i915_irq.c
 * and related files, but that will be described in separate chapters.
 */

typedef bool (*long_pulse_detect_func)(enum hpd_pin pin, u32 val);

static const u32 hpd_ilk[HPD_NUM_PINS] = {
        [HPD_PORT_A] = DE_DP_A_HOTPLUG,
};

static const u32 hpd_ivb[HPD_NUM_PINS] = {
        [HPD_PORT_A] = DE_DP_A_HOTPLUG_IVB,
};

static const u32 hpd_bdw[HPD_NUM_PINS] = {
        [HPD_PORT_A] = GEN8_PORT_DP_A_HOTPLUG,
};

static const u32 hpd_ibx[HPD_NUM_PINS] = {
        [HPD_CRT] = SDE_CRT_HOTPLUG,
        [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG,
        [HPD_PORT_B] = SDE_PORTB_HOTPLUG,
        [HPD_PORT_C] = SDE_PORTC_HOTPLUG,
        [HPD_PORT_D] = SDE_PORTD_HOTPLUG,
};

static const u32 hpd_cpt[HPD_NUM_PINS] = {
        [HPD_CRT] = SDE_CRT_HOTPLUG_CPT,
        [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG_CPT,
        [HPD_PORT_B] = SDE_PORTB_HOTPLUG_CPT,
        [HPD_PORT_C] = SDE_PORTC_HOTPLUG_CPT,
        [HPD_PORT_D] = SDE_PORTD_HOTPLUG_CPT,
};

static const u32 hpd_spt[HPD_NUM_PINS] = {
        [HPD_PORT_A] = SDE_PORTA_HOTPLUG_SPT,
        [HPD_PORT_B] = SDE_PORTB_HOTPLUG_CPT,
        [HPD_PORT_C] = SDE_PORTC_HOTPLUG_CPT,
        [HPD_PORT_D] = SDE_PORTD_HOTPLUG_CPT,
        [HPD_PORT_E] = SDE_PORTE_HOTPLUG_SPT,
};

static const u32 hpd_mask_i915[HPD_NUM_PINS] = {
        [HPD_CRT] = CRT_HOTPLUG_INT_EN,
        [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_EN,
        [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_EN,
        [HPD_PORT_B] = PORTB_HOTPLUG_INT_EN,
        [HPD_PORT_C] = PORTC_HOTPLUG_INT_EN,
        [HPD_PORT_D] = PORTD_HOTPLUG_INT_EN,
};

static const u32 hpd_status_g4x[HPD_NUM_PINS] = {
        [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
        [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_G4X,
        [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_G4X,
        [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
        [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
        [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS,
};

static const u32 hpd_status_i915[HPD_NUM_PINS] = {
        [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
        [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_I915,
        [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_I915,
        [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
        [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
        [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS,
};

/* BXT hpd list */
static const u32 hpd_bxt[HPD_NUM_PINS] = {
        [HPD_PORT_A] = BXT_DE_PORT_HP_DDIA,
        [HPD_PORT_B] = BXT_DE_PORT_HP_DDIB,
        [HPD_PORT_C] = BXT_DE_PORT_HP_DDIC,
};

static const u32 hpd_gen11[HPD_NUM_PINS] = {
        [HPD_PORT_C] = GEN11_TC1_HOTPLUG | GEN11_TBT1_HOTPLUG,
        [HPD_PORT_D] = GEN11_TC2_HOTPLUG | GEN11_TBT2_HOTPLUG,
        [HPD_PORT_E] = GEN11_TC3_HOTPLUG | GEN11_TBT3_HOTPLUG,
        [HPD_PORT_F] = GEN11_TC4_HOTPLUG | GEN11_TBT4_HOTPLUG,
};

static const u32 hpd_gen12[HPD_NUM_PINS] = {
        [HPD_PORT_D] = GEN11_TC1_HOTPLUG | GEN11_TBT1_HOTPLUG,
        [HPD_PORT_E] = GEN11_TC2_HOTPLUG | GEN11_TBT2_HOTPLUG,
        [HPD_PORT_F] = GEN11_TC3_HOTPLUG | GEN11_TBT3_HOTPLUG,
        [HPD_PORT_G] = GEN11_TC4_HOTPLUG | GEN11_TBT4_HOTPLUG,
        [HPD_PORT_H] = GEN12_TC5_HOTPLUG | GEN12_TBT5_HOTPLUG,
        [HPD_PORT_I] = GEN12_TC6_HOTPLUG | GEN12_TBT6_HOTPLUG,
};

static const u32 hpd_icp[HPD_NUM_PINS] = {
        [HPD_PORT_A] = SDE_DDI_HOTPLUG_ICP(PORT_A),
        [HPD_PORT_B] = SDE_DDI_HOTPLUG_ICP(PORT_B),
        [HPD_PORT_C] = SDE_TC_HOTPLUG_ICP(PORT_TC1),
        [HPD_PORT_D] = SDE_TC_HOTPLUG_ICP(PORT_TC2),
        [HPD_PORT_E] = SDE_TC_HOTPLUG_ICP(PORT_TC3),
        [HPD_PORT_F] = SDE_TC_HOTPLUG_ICP(PORT_TC4),
};

static const u32 hpd_tgp[HPD_NUM_PINS] = {
        [HPD_PORT_A] = SDE_DDI_HOTPLUG_ICP(PORT_A),
        [HPD_PORT_B] = SDE_DDI_HOTPLUG_ICP(PORT_B),
        [HPD_PORT_C] = SDE_DDI_HOTPLUG_ICP(PORT_C),
        [HPD_PORT_D] = SDE_TC_HOTPLUG_ICP(PORT_TC1),
        [HPD_PORT_E] = SDE_TC_HOTPLUG_ICP(PORT_TC2),
        [HPD_PORT_F] = SDE_TC_HOTPLUG_ICP(PORT_TC3),
        [HPD_PORT_G] = SDE_TC_HOTPLUG_ICP(PORT_TC4),
        [HPD_PORT_H] = SDE_TC_HOTPLUG_ICP(PORT_TC5),
        [HPD_PORT_I] = SDE_TC_HOTPLUG_ICP(PORT_TC6),
};

static void
intel_handle_vblank(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

        drm_crtc_handle_vblank(&crtc->base);
}

void gen3_irq_reset(struct intel_uncore *uncore, i915_reg_t imr,
                    i915_reg_t iir, i915_reg_t ier)
{
        intel_uncore_write(uncore, imr, 0xffffffff);
        intel_uncore_posting_read(uncore, imr);

        intel_uncore_write(uncore, ier, 0);

        /* IIR can theoretically queue up two events. Be paranoid. */
        intel_uncore_write(uncore, iir, 0xffffffff);
        intel_uncore_posting_read(uncore, iir);
        intel_uncore_write(uncore, iir, 0xffffffff);
        intel_uncore_posting_read(uncore, iir);
}

void gen2_irq_reset(struct intel_uncore *uncore)
{
        intel_uncore_write16(uncore, GEN2_IMR, 0xffff);
        intel_uncore_posting_read16(uncore, GEN2_IMR);

        intel_uncore_write16(uncore, GEN2_IER, 0);

        /* IIR can theoretically queue up two events. Be paranoid. */
        intel_uncore_write16(uncore, GEN2_IIR, 0xffff);
        intel_uncore_posting_read16(uncore, GEN2_IIR);
        intel_uncore_write16(uncore, GEN2_IIR, 0xffff);
        intel_uncore_posting_read16(uncore, GEN2_IIR);
}

/*
 * We should clear IMR at preinstall/uninstall, and just check at postinstall.
 */
static void gen3_assert_iir_is_zero(struct intel_uncore *uncore, i915_reg_t reg)
{
        u32 val = intel_uncore_read(uncore, reg);

        if (val == 0)
                return;

        drm_WARN(&uncore->i915->drm, 1,
                 "Interrupt register 0x%x is not zero: 0x%08x\n",
                 i915_mmio_reg_offset(reg), val);
        intel_uncore_write(uncore, reg, 0xffffffff);
        intel_uncore_posting_read(uncore, reg);
        intel_uncore_write(uncore, reg, 0xffffffff);
        intel_uncore_posting_read(uncore, reg);
}

static void gen2_assert_iir_is_zero(struct intel_uncore *uncore)
{
        u16 val = intel_uncore_read16(uncore, GEN2_IIR);

        if (val == 0)
                return;

        drm_WARN(&uncore->i915->drm, 1,
                 "Interrupt register 0x%x is not zero: 0x%08x\n",
                 i915_mmio_reg_offset(GEN2_IIR), val);
        intel_uncore_write16(uncore, GEN2_IIR, 0xffff);
        intel_uncore_posting_read16(uncore, GEN2_IIR);
        intel_uncore_write16(uncore, GEN2_IIR, 0xffff);
        intel_uncore_posting_read16(uncore, GEN2_IIR);
}

void gen3_irq_init(struct intel_uncore *uncore,
                   i915_reg_t imr, u32 imr_val,
                   i915_reg_t ier, u32 ier_val,
                   i915_reg_t iir)
{
        gen3_assert_iir_is_zero(uncore, iir);

        intel_uncore_write(uncore, ier, ier_val);
        intel_uncore_write(uncore, imr, imr_val);
        intel_uncore_posting_read(uncore, imr);
}

void gen2_irq_init(struct intel_uncore *uncore,
                   u32 imr_val, u32 ier_val)
{
        gen2_assert_iir_is_zero(uncore);

        intel_uncore_write16(uncore, GEN2_IER, ier_val);
        intel_uncore_write16(uncore, GEN2_IMR, imr_val);
        intel_uncore_posting_read16(uncore, GEN2_IMR);
}

/* For display hotplug interrupt */
static inline void
i915_hotplug_interrupt_update_locked(struct drm_i915_private *dev_priv,
                                     u32 mask,
                                     u32 bits)
{
        u32 val;

        lockdep_assert_held(&dev_priv->irq_lock);
        drm_WARN_ON(&dev_priv->drm, bits & ~mask);

        val = I915_READ(PORT_HOTPLUG_EN);
        val &= ~mask;
        val |= bits;
        I915_WRITE(PORT_HOTPLUG_EN, val);
}

/**
 * i915_hotplug_interrupt_update - update hotplug interrupt enable
 * @dev_priv: driver private
 * @mask: bits to update
 * @bits: bits to enable
 * NOTE: the HPD enable bits are modified both inside and outside
 * of an interrupt context. To avoid that read-modify-write cycles
 * interfer, these bits are protected by a spinlock. Since this
 * function is usually not called from a context where the lock is
 * held already, this function acquires the lock itself. A non-locking
 * version is also available.
 */
void i915_hotplug_interrupt_update(struct drm_i915_private *dev_priv,
                                   u32 mask,
                                   u32 bits)
{
        spin_lock_irq(&dev_priv->irq_lock);
        i915_hotplug_interrupt_update_locked(dev_priv, mask, bits);
        spin_unlock_irq(&dev_priv->irq_lock);
}

/**
 * ilk_update_display_irq - update DEIMR
 * @dev_priv: driver private
 * @interrupt_mask: mask of interrupt bits to update
 * @enabled_irq_mask: mask of interrupt bits to enable
 */
void ilk_update_display_irq(struct drm_i915_private *dev_priv,
                            u32 interrupt_mask,
                            u32 enabled_irq_mask)
{
        u32 new_val;

        lockdep_assert_held(&dev_priv->irq_lock);

        drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);

        if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
                return;

        new_val = dev_priv->irq_mask;
        new_val &= ~interrupt_mask;
        new_val |= (~enabled_irq_mask & interrupt_mask);

        if (new_val != dev_priv->irq_mask) {
                dev_priv->irq_mask = new_val;
                I915_WRITE(DEIMR, dev_priv->irq_mask);
                POSTING_READ(DEIMR);
        }
}

/**
 * bdw_update_port_irq - update DE port interrupt
 * @dev_priv: driver private
 * @interrupt_mask: mask of interrupt bits to update
 * @enabled_irq_mask: mask of interrupt bits to enable
 */
static void bdw_update_port_irq(struct drm_i915_private *dev_priv,
                                u32 interrupt_mask,
                                u32 enabled_irq_mask)
{
        u32 new_val;
        u32 old_val;

        lockdep_assert_held(&dev_priv->irq_lock);

        drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);

        if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
                return;

        old_val = I915_READ(GEN8_DE_PORT_IMR);

        new_val = old_val;
        new_val &= ~interrupt_mask;
        new_val |= (~enabled_irq_mask & interrupt_mask);

        if (new_val != old_val) {
                I915_WRITE(GEN8_DE_PORT_IMR, new_val);
                POSTING_READ(GEN8_DE_PORT_IMR);
        }
}

/**
 * bdw_update_pipe_irq - update DE pipe interrupt
 * @dev_priv: driver private
 * @pipe: pipe whose interrupt to update
 * @interrupt_mask: mask of interrupt bits to update
 * @enabled_irq_mask: mask of interrupt bits to enable
 */
void bdw_update_pipe_irq(struct drm_i915_private *dev_priv,
                         enum pipe pipe,
                         u32 interrupt_mask,
                         u32 enabled_irq_mask)
{
        u32 new_val;

        lockdep_assert_held(&dev_priv->irq_lock);

        drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);

        if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
                return;

        new_val = dev_priv->de_irq_mask[pipe];
        new_val &= ~interrupt_mask;
        new_val |= (~enabled_irq_mask & interrupt_mask);

        if (new_val != dev_priv->de_irq_mask[pipe]) {
                dev_priv->de_irq_mask[pipe] = new_val;
                I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
                POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
        }
}

/**
 * ibx_display_interrupt_update - update SDEIMR
 * @dev_priv: driver private
 * @interrupt_mask: mask of interrupt bits to update
 * @enabled_irq_mask: mask of interrupt bits to enable
 */
void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,
                                  u32 interrupt_mask,
                                  u32 enabled_irq_mask)
{
        u32 sdeimr = I915_READ(SDEIMR);
        sdeimr &= ~interrupt_mask;
        sdeimr |= (~enabled_irq_mask & interrupt_mask);

        drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);

        lockdep_assert_held(&dev_priv->irq_lock);

        if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
                return;

        I915_WRITE(SDEIMR, sdeimr);
        POSTING_READ(SDEIMR);
}

u32 i915_pipestat_enable_mask(struct drm_i915_private *dev_priv,
                              enum pipe pipe)
{
        u32 status_mask = dev_priv->pipestat_irq_mask[pipe];
        u32 enable_mask = status_mask << 16;

        lockdep_assert_held(&dev_priv->irq_lock);

        if (INTEL_GEN(dev_priv) < 5)
                goto out;

        /*
         * On pipe A we don't support the PSR interrupt yet,
         * on pipe B and C the same bit MBZ.
         */
        if (drm_WARN_ON_ONCE(&dev_priv->drm,
                             status_mask & PIPE_A_PSR_STATUS_VLV))
                return 0;
        /*
         * On pipe B and C we don't support the PSR interrupt yet, on pipe
         * A the same bit is for perf counters which we don't use either.
         */
        if (drm_WARN_ON_ONCE(&dev_priv->drm,
                             status_mask & PIPE_B_PSR_STATUS_VLV))
                return 0;

        enable_mask &= ~(PIPE_FIFO_UNDERRUN_STATUS |
                         SPRITE0_FLIP_DONE_INT_EN_VLV |
                         SPRITE1_FLIP_DONE_INT_EN_VLV);
        if (status_mask & SPRITE0_FLIP_DONE_INT_STATUS_VLV)
                enable_mask |= SPRITE0_FLIP_DONE_INT_EN_VLV;
        if (status_mask & SPRITE1_FLIP_DONE_INT_STATUS_VLV)
                enable_mask |= SPRITE1_FLIP_DONE_INT_EN_VLV;

out:
        drm_WARN_ONCE(&dev_priv->drm,
                      enable_mask & ~PIPESTAT_INT_ENABLE_MASK ||
                      status_mask & ~PIPESTAT_INT_STATUS_MASK,
                      "pipe %c: enable_mask=0x%x, status_mask=0x%x\n",
                      pipe_name(pipe), enable_mask, status_mask);

        return enable_mask;
}

void i915_enable_pipestat(struct drm_i915_private *dev_priv,
                          enum pipe pipe, u32 status_mask)
{
        i915_reg_t reg = PIPESTAT(pipe);
        u32 enable_mask;

        drm_WARN_ONCE(&dev_priv->drm, status_mask & ~PIPESTAT_INT_STATUS_MASK,
                      "pipe %c: status_mask=0x%x\n",
                      pipe_name(pipe), status_mask);

        lockdep_assert_held(&dev_priv->irq_lock);
        drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv));

        if ((dev_priv->pipestat_irq_mask[pipe] & status_mask) == status_mask)
                return;

        dev_priv->pipestat_irq_mask[pipe] |= status_mask;
        enable_mask = i915_pipestat_enable_mask(dev_priv, pipe);

        I915_WRITE(reg, enable_mask | status_mask);
        POSTING_READ(reg);
}

void i915_disable_pipestat(struct drm_i915_private *dev_priv,
                           enum pipe pipe, u32 status_mask)
{
        i915_reg_t reg = PIPESTAT(pipe);
        u32 enable_mask;

        drm_WARN_ONCE(&dev_priv->drm, status_mask & ~PIPESTAT_INT_STATUS_MASK,
                      "pipe %c: status_mask=0x%x\n",
                      pipe_name(pipe), status_mask);

        lockdep_assert_held(&dev_priv->irq_lock);
        drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv));

        if ((dev_priv->pipestat_irq_mask[pipe] & status_mask) == 0)
                return;

        dev_priv->pipestat_irq_mask[pipe] &= ~status_mask;
        enable_mask = i915_pipestat_enable_mask(dev_priv, pipe);

        I915_WRITE(reg, enable_mask | status_mask);
        POSTING_READ(reg);
}

static bool i915_has_asle(struct drm_i915_private *dev_priv)
{
        if (!dev_priv->opregion.asle)
                return false;

        return IS_PINEVIEW(dev_priv) || IS_MOBILE(dev_priv);
}

/**
 * i915_enable_asle_pipestat - enable ASLE pipestat for OpRegion
 * @dev_priv: i915 device private
 */
static void i915_enable_asle_pipestat(struct drm_i915_private *dev_priv)
{
        if (!i915_has_asle(dev_priv))
                return;

        spin_lock_irq(&dev_priv->irq_lock);

        i915_enable_pipestat(dev_priv, PIPE_B, PIPE_LEGACY_BLC_EVENT_STATUS);
        if (INTEL_GEN(dev_priv) >= 4)
                i915_enable_pipestat(dev_priv, PIPE_A,
                                     PIPE_LEGACY_BLC_EVENT_STATUS);

        spin_unlock_irq(&dev_priv->irq_lock);
}

/*
 * This timing diagram depicts the video signal in and
 * around the vertical blanking period.
 *
 * Assumptions about the fictitious mode used in this example:
 *  vblank_start >= 3
 *  vsync_start = vblank_start + 1
 *  vsync_end = vblank_start + 2
 *  vtotal = vblank_start + 3
 *
 *           start of vblank:
 *           latch double buffered registers
 *           increment frame counter (ctg+)
 *           generate start of vblank interrupt (gen4+)
 *           |
 *           |          frame start:
 *           |          generate frame start interrupt (aka. vblank interrupt) (gmch)
 *           |          may be shifted forward 1-3 extra lines via PIPECONF
 *           |          |
 *           |          |  start of vsync:
 *           |          |  generate vsync interrupt
 *           |          |  |
 * ___xxxx___    ___xxxx___    ___xxxx___    ___xxxx___    ___xxxx___    ___xxxx
 *       .   \hs/   .      \hs/          \hs/          \hs/   .      \hs/
 * ----va---> <-----------------vb--------------------> <--------va-------------
 *       |          |       <----vs----->                     |
 * -vbs-----> <---vbs+1---> <---vbs+2---> <-----0-----> <-----1-----> <-----2--- (scanline counter gen2)
 * -vbs-2---> <---vbs-1---> <---vbs-----> <---vbs+1---> <---vbs+2---> <-----0--- (scanline counter gen3+)
 * -vbs-2---> <---vbs-2---> <---vbs-1---> <---vbs-----> <---vbs+1---> <---vbs+2- (scanline counter hsw+ hdmi)
 *       |          |                                         |
 *       last visible pixel                                   first visible pixel
 *                  |                                         increment frame counter (gen3/4)
 *                  pixel counter = vblank_start * htotal     pixel counter = 0 (gen3/4)
 *
 * x  = horizontal active
 * _  = horizontal blanking
 * hs = horizontal sync
 * va = vertical active
 * vb = vertical blanking
 * vs = vertical sync
 * vbs = vblank_start (number)
 *
 * Summary:
 * - most events happen at the start of horizontal sync
 * - frame start happens at the start of horizontal blank, 1-4 lines
 *   (depending on PIPECONF settings) after the start of vblank
 * - gen3/4 pixel and frame counter are synchronized with the start
 *   of horizontal active on the first line of vertical active
 */

/* Called from drm generic code, passed a 'crtc', which
 * we use as a pipe index
 */
u32 i915_get_vblank_counter(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct drm_vblank_crtc *vblank = &dev_priv->drm.vblank[drm_crtc_index(crtc)];
        const struct drm_display_mode *mode = &vblank->hwmode;
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        i915_reg_t high_frame, low_frame;
        u32 high1, high2, low, pixel, vbl_start, hsync_start, htotal;
        unsigned long irqflags;

        /*
         * On i965gm TV output the frame counter only works up to
         * the point when we enable the TV encoder. After that the
         * frame counter ceases to work and reads zero. We need a
         * vblank wait before enabling the TV encoder and so we
         * have to enable vblank interrupts while the frame counter
         * is still in a working state. However the core vblank code
         * does not like us returning non-zero frame counter values
         * when we've told it that we don't have a working frame
         * counter. Thus we must stop non-zero values leaking out.
         */
        if (!vblank->max_vblank_count)
                return 0;

        htotal = mode->crtc_htotal;
        hsync_start = mode->crtc_hsync_start;
        vbl_start = mode->crtc_vblank_start;
        if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                vbl_start = DIV_ROUND_UP(vbl_start, 2);

        /* Convert to pixel count */
        vbl_start *= htotal;

        /* Start of vblank event occurs at start of hsync */
        vbl_start -= htotal - hsync_start;

        high_frame = PIPEFRAME(pipe);
        low_frame = PIPEFRAMEPIXEL(pipe);

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        /*
         * High & low register fields aren't synchronized, so make sure
         * we get a low value that's stable across two reads of the high
         * register.
         */
        do {
                high1 = intel_de_read_fw(dev_priv, high_frame) & PIPE_FRAME_HIGH_MASK;
                low   = intel_de_read_fw(dev_priv, low_frame);
                high2 = intel_de_read_fw(dev_priv, high_frame) & PIPE_FRAME_HIGH_MASK;
        } while (high1 != high2);

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

        high1 >>= PIPE_FRAME_HIGH_SHIFT;
        pixel = low & PIPE_PIXEL_MASK;
        low >>= PIPE_FRAME_LOW_SHIFT;

        /*
         * The frame counter increments at beginning of active.
         * Cook up a vblank counter by also checking the pixel
         * counter against vblank start.
         */
        return (((high1 << 8) | low) + (pixel >= vbl_start)) & 0xffffff;
}

u32 g4x_get_vblank_counter(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;

        return I915_READ(PIPE_FRMCOUNT_G4X(pipe));
}

/*
 * On certain encoders on certain platforms, pipe
 * scanline register will not work to get the scanline,
 * since the timings are driven from the PORT or issues
 * with scanline register updates.
 * This function will use Framestamp and current
 * timestamp registers to calculate the scanline.
 */
static u32 __intel_get_crtc_scanline_from_timestamp(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct drm_vblank_crtc *vblank =
                &crtc->base.dev->vblank[drm_crtc_index(&crtc->base)];
        const struct drm_display_mode *mode = &vblank->hwmode;
        u32 vblank_start = mode->crtc_vblank_start;
        u32 vtotal = mode->crtc_vtotal;
        u32 htotal = mode->crtc_htotal;
        u32 clock = mode->crtc_clock;
        u32 scanline, scan_prev_time, scan_curr_time, scan_post_time;

        /*
         * To avoid the race condition where we might cross into the
         * next vblank just between the PIPE_FRMTMSTMP and TIMESTAMP_CTR
         * reads. We make sure we read PIPE_FRMTMSTMP and TIMESTAMP_CTR
         * during the same frame.
         */
        do {
                /*
                 * This field provides read back of the display
                 * pipe frame time stamp. The time stamp value
                 * is sampled at every start of vertical blank.
                 */
                scan_prev_time = intel_de_read_fw(dev_priv,
                                                  PIPE_FRMTMSTMP(crtc->pipe));

                /*
                 * The TIMESTAMP_CTR register has the current
                 * time stamp value.
                 */
                scan_curr_time = intel_de_read_fw(dev_priv, IVB_TIMESTAMP_CTR);

                scan_post_time = intel_de_read_fw(dev_priv,
                                                  PIPE_FRMTMSTMP(crtc->pipe));
        } while (scan_post_time != scan_prev_time);

        scanline = div_u64(mul_u32_u32(scan_curr_time - scan_prev_time,
                                        clock), 1000 * htotal);
        scanline = min(scanline, vtotal - 1);
        scanline = (scanline + vblank_start) % vtotal;

        return scanline;
}

/*
 * intel_de_read_fw(), only for fast reads of display block, no need for
 * forcewake etc.
 */
static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct drm_display_mode *mode;
        struct drm_vblank_crtc *vblank;
        enum pipe pipe = crtc->pipe;
        int position, vtotal;

        if (!crtc->active)
                return -1;

        vblank = &crtc->base.dev->vblank[drm_crtc_index(&crtc->base)];
        mode = &vblank->hwmode;

        if (mode->private_flags & I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP)
                return __intel_get_crtc_scanline_from_timestamp(crtc);

        vtotal = mode->crtc_vtotal;
        if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                vtotal /= 2;

        if (IS_GEN(dev_priv, 2))
                position = intel_de_read_fw(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN2;
        else
                position = intel_de_read_fw(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN3;

        /*
         * On HSW, the DSL reg (0x70000) appears to return 0 if we
         * read it just before the start of vblank.  So try it again
         * so we don't accidentally end up spanning a vblank frame
         * increment, causing the pipe_update_end() code to squak at us.
         *
         * The nature of this problem means we can't simply check the ISR
         * bit and return the vblank start value; nor can we use the scanline
         * debug register in the transcoder as it appears to have the same
         * problem.  We may need to extend this to include other platforms,
         * but so far testing only shows the problem on HSW.
         */
        if (HAS_DDI(dev_priv) && !position) {
                int i, temp;

                for (i = 0; i < 100; i++) {
                        udelay(1);
                        temp = intel_de_read_fw(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN3;
                        if (temp != position) {
                                position = temp;
                                break;
                        }
                }
        }

        /*
         * See update_scanline_offset() for the details on the
         * scanline_offset adjustment.
         */
        return (position + crtc->scanline_offset) % vtotal;
}

static bool i915_get_crtc_scanoutpos(struct drm_crtc *_crtc,
                                     bool in_vblank_irq,
                                     int *vpos, int *hpos,
                                     ktime_t *stime, ktime_t *etime,
                                     const struct drm_display_mode *mode)
{
        struct drm_device *dev = _crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *crtc = to_intel_crtc(_crtc);
        enum pipe pipe = crtc->pipe;
        int position;
        int vbl_start, vbl_end, hsync_start, htotal, vtotal;
        unsigned long irqflags;
        bool use_scanline_counter = INTEL_GEN(dev_priv) >= 5 ||
                IS_G4X(dev_priv) || IS_GEN(dev_priv, 2) ||
                mode->private_flags & I915_MODE_FLAG_USE_SCANLINE_COUNTER;

        if (drm_WARN_ON(&dev_priv->drm, !mode->crtc_clock)) {
                drm_dbg(&dev_priv->drm,
                        "trying to get scanoutpos for disabled "
                        "pipe %c\n", pipe_name(pipe));
                return false;
        }

        htotal = mode->crtc_htotal;
        hsync_start = mode->crtc_hsync_start;
        vtotal = mode->crtc_vtotal;
        vbl_start = mode->crtc_vblank_start;
        vbl_end = mode->crtc_vblank_end;

        if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
                vbl_start = DIV_ROUND_UP(vbl_start, 2);
                vbl_end /= 2;
                vtotal /= 2;
        }

        /*
         * Lock uncore.lock, as we will do multiple timing critical raw
         * register reads, potentially with preemption disabled, so the
         * following code must not block on uncore.lock.
         */
        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */

        /* Get optional system timestamp before query. */
        if (stime)
                *stime = ktime_get();

        if (use_scanline_counter) {
                /* No obvious pixelcount register. Only query vertical
                 * scanout position from Display scan line register.
                 */
                position = __intel_get_crtc_scanline(crtc);
        } else {
                /* Have access to pixelcount since start of frame.
                 * We can split this into vertical and horizontal
                 * scanout position.
                 */
                position = (intel_de_read_fw(dev_priv, PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT;

                /* convert to pixel counts */
                vbl_start *= htotal;
                vbl_end *= htotal;
                vtotal *= htotal;

                /*
                 * In interlaced modes, the pixel counter counts all pixels,
                 * so one field will have htotal more pixels. In order to avoid
                 * the reported position from jumping backwards when the pixel
                 * counter is beyond the length of the shorter field, just
                 * clamp the position the length of the shorter field. This
                 * matches how the scanline counter based position works since
                 * the scanline counter doesn't count the two half lines.
                 */
                if (position >= vtotal)
                        position = vtotal - 1;

                /*
                 * Start of vblank interrupt is triggered at start of hsync,
                 * just prior to the first active line of vblank. However we
                 * consider lines to start at the leading edge of horizontal
                 * active. So, should we get here before we've crossed into
                 * the horizontal active of the first line in vblank, we would
                 * not set the DRM_SCANOUTPOS_INVBL flag. In order to fix that,
                 * always add htotal-hsync_start to the current pixel position.
                 */
                position = (position + htotal - hsync_start) % vtotal;
        }

        /* Get optional system timestamp after query. */
        if (etime)
                *etime = ktime_get();

        /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

        /*
         * While in vblank, position will be negative
         * counting up towards 0 at vbl_end. And outside
         * vblank, position will be positive counting
         * up since vbl_end.
         */
        if (position >= vbl_start)
                position -= vbl_end;
        else
                position += vtotal - vbl_end;

        if (use_scanline_counter) {
                *vpos = position;
                *hpos = 0;
        } else {
                *vpos = position / htotal;
                *hpos = position - (*vpos * htotal);
        }

        return true;
}

bool intel_crtc_get_vblank_timestamp(struct drm_crtc *crtc, int *max_error,
                                     ktime_t *vblank_time, bool in_vblank_irq)
{
        return drm_crtc_vblank_helper_get_vblank_timestamp_internal(
                crtc, max_error, vblank_time, in_vblank_irq,
                i915_get_crtc_scanoutpos);
}

int intel_get_crtc_scanline(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        unsigned long irqflags;
        int position;

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
        position = __intel_get_crtc_scanline(crtc);
        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

        return position;
}

/**
 * ivb_parity_work - Workqueue called when a parity error interrupt
 * occurred.
 * @work: workqueue struct
 *
 * Doesn't actually do anything except notify userspace. As a consequence of
 * this event, userspace should try to remap the bad rows since statistically
 * it is likely the same row is more likely to go bad again.
 */
static void ivb_parity_work(struct work_struct *work)
{
        struct drm_i915_private *dev_priv =
                container_of(work, typeof(*dev_priv), l3_parity.error_work);
        struct intel_gt *gt = &dev_priv->gt;
        u32 error_status, row, bank, subbank;
        char *parity_event[6];
        u32 misccpctl;
        u8 slice = 0;

        /* We must turn off DOP level clock gating to access the L3 registers.
         * In order to prevent a get/put style interface, acquire struct mutex
         * any time we access those registers.
         */
        mutex_lock(&dev_priv->drm.struct_mutex);

        /* If we've screwed up tracking, just let the interrupt fire again */
        if (drm_WARN_ON(&dev_priv->drm, !dev_priv->l3_parity.which_slice))
                goto out;

        misccpctl = I915_READ(GEN7_MISCCPCTL);
        I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
        POSTING_READ(GEN7_MISCCPCTL);

        while ((slice = ffs(dev_priv->l3_parity.which_slice)) != 0) {
                i915_reg_t reg;

                slice--;
                if (drm_WARN_ON_ONCE(&dev_priv->drm,
                                     slice >= NUM_L3_SLICES(dev_priv)))
                        break;

                dev_priv->l3_parity.which_slice &= ~(1<<slice);

                reg = GEN7_L3CDERRST1(slice);

                error_status = I915_READ(reg);
                row = GEN7_PARITY_ERROR_ROW(error_status);
                bank = GEN7_PARITY_ERROR_BANK(error_status);
                subbank = GEN7_PARITY_ERROR_SUBBANK(error_status);

                I915_WRITE(reg, GEN7_PARITY_ERROR_VALID | GEN7_L3CDERRST1_ENABLE);
                POSTING_READ(reg);

                parity_event[0] = I915_L3_PARITY_UEVENT "=1";
                parity_event[1] = kasprintf(GFP_KERNEL, "ROW=%d", row);
                parity_event[2] = kasprintf(GFP_KERNEL, "BANK=%d", bank);
                parity_event[3] = kasprintf(GFP_KERNEL, "SUBBANK=%d", subbank);
                parity_event[4] = kasprintf(GFP_KERNEL, "SLICE=%d", slice);
                parity_event[5] = NULL;

                kobject_uevent_env(&dev_priv->drm.primary->kdev->kobj,
                                   KOBJ_CHANGE, parity_event);

                DRM_DEBUG("Parity error: Slice = %d, Row = %d, Bank = %d, Sub bank = %d.\n",
                          slice, row, bank, subbank);

                kfree(parity_event[4]);
                kfree(parity_event[3]);
                kfree(parity_event[2]);
                kfree(parity_event[1]);
        }

        I915_WRITE(GEN7_MISCCPCTL, misccpctl);

out:
        drm_WARN_ON(&dev_priv->drm, dev_priv->l3_parity.which_slice);
        spin_lock_irq(&gt->irq_lock);
        gen5_gt_enable_irq(gt, GT_PARITY_ERROR(dev_priv));

        spin_unlock_irq(&gt->irq_lock);

        mutex_unlock(&dev_priv->drm.struct_mutex);
}

static bool gen11_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_C:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC1);
        case HPD_PORT_D:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC2);
        case HPD_PORT_E:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC3);
        case HPD_PORT_F:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC4);
        default:
                return false;
        }
}

static bool gen12_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_D:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC1);
        case HPD_PORT_E:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC2);
        case HPD_PORT_F:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC3);
        case HPD_PORT_G:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC4);
        case HPD_PORT_H:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC5);
        case HPD_PORT_I:
                return val & GEN11_HOTPLUG_CTL_LONG_DETECT(PORT_TC6);
        default:
                return false;
        }
}

static bool bxt_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_A:
                return val & PORTA_HOTPLUG_LONG_DETECT;
        case HPD_PORT_B:
                return val & PORTB_HOTPLUG_LONG_DETECT;
        case HPD_PORT_C:
                return val & PORTC_HOTPLUG_LONG_DETECT;
        default:
                return false;
        }
}

static bool icp_ddi_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_A:
                return val & SHOTPLUG_CTL_DDI_HPD_LONG_DETECT(PORT_A);
        case HPD_PORT_B:
                return val & SHOTPLUG_CTL_DDI_HPD_LONG_DETECT(PORT_B);
        case HPD_PORT_C:
                return val & SHOTPLUG_CTL_DDI_HPD_LONG_DETECT(PORT_C);
        default:
                return false;
        }
}

static bool icp_tc_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_C:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC1);
        case HPD_PORT_D:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC2);
        case HPD_PORT_E:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC3);
        case HPD_PORT_F:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC4);
        default:
                return false;
        }
}

static bool tgp_tc_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_D:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC1);
        case HPD_PORT_E:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC2);
        case HPD_PORT_F:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC3);
        case HPD_PORT_G:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC4);
        case HPD_PORT_H:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC5);
        case HPD_PORT_I:
                return val & ICP_TC_HPD_LONG_DETECT(PORT_TC6);
        default:
                return false;
        }
}

static bool spt_port_hotplug2_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_E:
                return val & PORTE_HOTPLUG_LONG_DETECT;
        default:
                return false;
        }
}

static bool spt_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_A:
                return val & PORTA_HOTPLUG_LONG_DETECT;
        case HPD_PORT_B:
                return val & PORTB_HOTPLUG_LONG_DETECT;
        case HPD_PORT_C:
                return val & PORTC_HOTPLUG_LONG_DETECT;
        case HPD_PORT_D:
                return val & PORTD_HOTPLUG_LONG_DETECT;
        default:
                return false;
        }
}

static bool ilk_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_A:
                return val & DIGITAL_PORTA_HOTPLUG_LONG_DETECT;
        default:
                return false;
        }
}

static bool pch_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_B:
                return val & PORTB_HOTPLUG_LONG_DETECT;
        case HPD_PORT_C:
                return val & PORTC_HOTPLUG_LONG_DETECT;
        case HPD_PORT_D:
                return val & PORTD_HOTPLUG_LONG_DETECT;
        default:
                return false;
        }
}

static bool i9xx_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
{
        switch (pin) {
        case HPD_PORT_B:
                return val & PORTB_HOTPLUG_INT_LONG_PULSE;
        case HPD_PORT_C:
                return val & PORTC_HOTPLUG_INT_LONG_PULSE;
        case HPD_PORT_D:
                return val & PORTD_HOTPLUG_INT_LONG_PULSE;
        default:
                return false;
        }
}

/*
 * Get a bit mask of pins that have triggered, and which ones may be long.
 * This can be called multiple times with the same masks to accumulate
 * hotplug detection results from several registers.
 *
 * Note that the caller is expected to zero out the masks initially.
 */
static void intel_get_hpd_pins(struct drm_i915_private *dev_priv,
                               u32 *pin_mask, u32 *long_mask,
                               u32 hotplug_trigger, u32 dig_hotplug_reg,
                               const u32 hpd[HPD_NUM_PINS],
                               bool long_pulse_detect(enum hpd_pin pin, u32 val))
{
        enum hpd_pin pin;

        BUILD_BUG_ON(BITS_PER_TYPE(*pin_mask) < HPD_NUM_PINS);

        for_each_hpd_pin(pin) {
                if ((hpd[pin] & hotplug_trigger) == 0)
                        continue;

                *pin_mask |= BIT(pin);

                if (long_pulse_detect(pin, dig_hotplug_reg))
                        *long_mask |= BIT(pin);
        }

        drm_dbg(&dev_priv->drm,
                "hotplug event received, stat 0x%08x, dig 0x%08x, pins 0x%08x, long 0x%08x\n",
                hotplug_trigger, dig_hotplug_reg, *pin_mask, *long_mask);

}

static void gmbus_irq_handler(struct drm_i915_private *dev_priv)
{
        wake_up_all(&dev_priv->gmbus_wait_queue);
}

static void dp_aux_irq_handler(struct drm_i915_private *dev_priv)
{
        wake_up_all(&dev_priv->gmbus_wait_queue);
}

#if defined(CONFIG_DEBUG_FS)
static void display_pipe_crc_irq_handler(struct drm_i915_private *dev_priv,
                                         enum pipe pipe,
                                         u32 crc0, u32 crc1,
                                         u32 crc2, u32 crc3,
                                         u32 crc4)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
        struct intel_pipe_crc *pipe_crc = &crtc->pipe_crc;
        u32 crcs[5] = { crc0, crc1, crc2, crc3, crc4 };

        trace_intel_pipe_crc(crtc, crcs);

        spin_lock(&pipe_crc->lock);
        /*
         * For some not yet identified reason, the first CRC is
         * bonkers. So let's just wait for the next vblank and read
         * out the buggy result.
         *
         * On GEN8+ sometimes the second CRC is bonkers as well, so
         * don't trust that one either.
         */
        if (pipe_crc->skipped <= 0 ||
            (INTEL_GEN(dev_priv) >= 8 && pipe_crc->skipped == 1)) {
                pipe_crc->skipped++;
                spin_unlock(&pipe_crc->lock);
                return;
        }
        spin_unlock(&pipe_crc->lock);

        drm_crtc_add_crc_entry(&crtc->base, true,
                                drm_crtc_accurate_vblank_count(&crtc->base),
                                crcs);
}
#else
static inline void
display_pipe_crc_irq_handler(struct drm_i915_private *dev_priv,
                             enum pipe pipe,
                             u32 crc0, u32 crc1,
                             u32 crc2, u32 crc3,
                             u32 crc4) {}
#endif


static void hsw_pipe_crc_irq_handler(struct drm_i915_private *dev_priv,
                                     enum pipe pipe)
{
        display_pipe_crc_irq_handler(dev_priv, pipe,
                                     I915_READ(PIPE_CRC_RES_1_IVB(pipe)),
                                     0, 0, 0, 0);
}

static void ivb_pipe_crc_irq_handler(struct drm_i915_private *dev_priv,
                                     enum pipe pipe)
{
        display_pipe_crc_irq_handler(dev_priv, pipe,
                                     I915_READ(PIPE_CRC_RES_1_IVB(pipe)),
                                     I915_READ(PIPE_CRC_RES_2_IVB(pipe)),
                                     I915_READ(PIPE_CRC_RES_3_IVB(pipe)),
                                     I915_READ(PIPE_CRC_RES_4_IVB(pipe)),
                                     I915_READ(PIPE_CRC_RES_5_IVB(pipe)));
}

static void i9xx_pipe_crc_irq_handler(struct drm_i915_private *dev_priv,
                                      enum pipe pipe)
{
        u32 res1, res2;

        if (INTEL_GEN(dev_priv) >= 3)
                res1 = I915_READ(PIPE_CRC_RES_RES1_I915(pipe));
        else
                res1 = 0;

        if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
                res2 = I915_READ(PIPE_CRC_RES_RES2_G4X(pipe));
        else
                res2 = 0;

        display_pipe_crc_irq_handler(dev_priv, pipe,
                                     I915_READ(PIPE_CRC_RES_RED(pipe)),
                                     I915_READ(PIPE_CRC_RES_GREEN(pipe)),
                                     I915_READ(PIPE_CRC_RES_BLUE(pipe)),
                                     res1, res2);
}

static void i9xx_pipestat_irq_reset(struct drm_i915_private *dev_priv)
{
        enum pipe pipe;

        for_each_pipe(dev_priv, pipe) {
                I915_WRITE(PIPESTAT(pipe),
                           PIPESTAT_INT_STATUS_MASK |
                           PIPE_FIFO_UNDERRUN_STATUS);

                dev_priv->pipestat_irq_mask[pipe] = 0;
        }
}

static void i9xx_pipestat_irq_ack(struct drm_i915_private *dev_priv,
                                  u32 iir, u32 pipe_stats[I915_MAX_PIPES])
{
        enum pipe pipe;

        spin_lock(&dev_priv->irq_lock);

        if (!dev_priv->display_irqs_enabled) {
                spin_unlock(&dev_priv->irq_lock);
                return;
        }

        for_each_pipe(dev_priv, pipe) {
                i915_reg_t reg;
                u32 status_mask, enable_mask, iir_bit = 0;

                /*
                 * PIPESTAT bits get signalled even when the interrupt is
                 * disabled with the mask bits, and some of the status bits do
                 * not generate interrupts at all (like the underrun bit). Hence
                 * we need to be careful that we only handle what we want to
                 * handle.
                 */

                /* fifo underruns are filterered in the underrun handler. */
                status_mask = PIPE_FIFO_UNDERRUN_STATUS;

                switch (pipe) {
                default:
                case PIPE_A:
                        iir_bit = I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
                        break;
                case PIPE_B:
                        iir_bit = I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
                        break;
                case PIPE_C:
                        iir_bit = I915_DISPLAY_PIPE_C_EVENT_INTERRUPT;
                        break;
                }
                if (iir & iir_bit)
                        status_mask |= dev_priv->pipestat_irq_mask[pipe];

                if (!status_mask)
                        continue;

                reg = PIPESTAT(pipe);
                pipe_stats[pipe] = I915_READ(reg) & status_mask;
                enable_mask = i915_pipestat_enable_mask(dev_priv, pipe);

                /*
                 * Clear the PIPE*STAT regs before the IIR
                 *
                 * Toggle the enable bits to make sure we get an
                 * edge in the ISR pipe event bit if we don't clear
                 * all the enabled status bits. Otherwise the edge
                 * triggered IIR on i965/g4x wouldn't notice that
                 * an interrupt is still pending.
                 */
                if (pipe_stats[pipe]) {
                        I915_WRITE(reg, pipe_stats[pipe]);
                        I915_WRITE(reg, enable_mask);
                }
        }
        spin_unlock(&dev_priv->irq_lock);
}

static void i8xx_pipestat_irq_handler(struct drm_i915_private *dev_priv,
                                      u16 iir, u32 pipe_stats[I915_MAX_PIPES])
{
        enum pipe pipe;

        for_each_pipe(dev_priv, pipe) {
                if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
                        intel_handle_vblank(dev_priv, pipe);

                if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
                        i9xx_pipe_crc_irq_handler(dev_priv, pipe);

                if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
                        intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
        }
}

static void i915_pipestat_irq_handler(struct drm_i915_private *dev_priv,
                                      u32 iir, u32 pipe_stats[I915_MAX_PIPES])
{
        bool blc_event = false;
        enum pipe pipe;

        for_each_pipe(dev_priv, pipe) {
                if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
                        intel_handle_vblank(dev_priv, pipe);

                if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
                        blc_event = true;

                if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
                        i9xx_pipe_crc_irq_handler(dev_priv, pipe);

                if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
                        intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
        }

        if (blc_event || (iir & I915_ASLE_INTERRUPT))
                intel_opregion_asle_intr(dev_priv);
}

static void i965_pipestat_irq_handler(struct drm_i915_private *dev_priv,
                                      u32 iir, u32 pipe_stats[I915_MAX_PIPES])
{
        bool blc_event = false;
        enum pipe pipe;

        for_each_pipe(dev_priv, pipe) {
                if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS)
                        intel_handle_vblank(dev_priv, pipe);

                if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
                        blc_event = true;

                if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
                        i9xx_pipe_crc_irq_handler(dev_priv, pipe);

                if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
                        intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
        }

        if (blc_event || (iir & I915_ASLE_INTERRUPT))
                intel_opregion_asle_intr(dev_priv);

        if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
                gmbus_irq_handler(dev_priv);
}

static void valleyview_pipestat_irq_handler(struct drm_i915_private *dev_priv,
                                            u32 pipe_stats[I915_MAX_PIPES])
{
        enum pipe pipe;

        for_each_pipe(dev_priv, pipe) {
                if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS)
                        intel_handle_vblank(dev_priv, pipe);

                if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
                        i9xx_pipe_crc_irq_handler(dev_priv, pipe);

                if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
                        intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
        }

        if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
                gmbus_irq_handler(dev_priv);
}

static u32 i9xx_hpd_irq_ack(struct drm_i915_private *dev_priv)
{
        u32 hotplug_status = 0, hotplug_status_mask;
        int i;

        if (IS_G4X(dev_priv) ||
            IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                hotplug_status_mask = HOTPLUG_INT_STATUS_G4X |
                        DP_AUX_CHANNEL_MASK_INT_STATUS_G4X;
        else
                hotplug_status_mask = HOTPLUG_INT_STATUS_I915;

        /*
         * We absolutely have to clear all the pending interrupt
         * bits in PORT_HOTPLUG_STAT. Otherwise the ISR port
         * interrupt bit won't have an edge, and the i965/g4x
         * edge triggered IIR will not notice that an interrupt
         * is still pending. We can't use PORT_HOTPLUG_EN to
         * guarantee the edge as the act of toggling the enable
         * bits can itself generate a new hotplug interrupt :(
         */
        for (i = 0; i < 10; i++) {
                u32 tmp = I915_READ(PORT_HOTPLUG_STAT) & hotplug_status_mask;

                if (tmp == 0)
                        return hotplug_status;

                hotplug_status |= tmp;
                I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
        }

        drm_WARN_ONCE(&dev_priv->drm, 1,
                      "PORT_HOTPLUG_STAT did not clear (0x%08x)\n",
                      I915_READ(PORT_HOTPLUG_STAT));

        return hotplug_status;
}

static void i9xx_hpd_irq_handler(struct drm_i915_private *dev_priv,
                                 u32 hotplug_status)
{
        u32 pin_mask = 0, long_mask = 0;

        if (IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)) {
                u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_G4X;

                if (hotplug_trigger) {
                        intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
                                           hotplug_trigger, hotplug_trigger,
                                           hpd_status_g4x,
                                           i9xx_port_hotplug_long_detect);

                        intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
                }

                if (hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X)
                        dp_aux_irq_handler(dev_priv);
        } else {
                u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;

                if (hotplug_trigger) {
                        intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
                                           hotplug_trigger, hotplug_trigger,
                                           hpd_status_i915,
                                           i9xx_port_hotplug_long_detect);
                        intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
                }
        }
}

static irqreturn_t valleyview_irq_handler(int irq, void *arg)
{
        struct drm_i915_private *dev_priv = arg;
        irqreturn_t ret = IRQ_NONE;

        if (!intel_irqs_enabled(dev_priv))
                return IRQ_NONE;

        /* IRQs are synced during runtime_suspend, we don't require a wakeref */
        disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        do {
                u32 iir, gt_iir, pm_iir;
                u32 pipe_stats[I915_MAX_PIPES] = {};
                u32 hotplug_status = 0;
                u32 ier = 0;

                gt_iir = I915_READ(GTIIR);
                pm_iir = I915_READ(GEN6_PMIIR);
                iir = I915_READ(VLV_IIR);

                if (gt_iir == 0 && pm_iir == 0 && iir == 0)
                        break;

                ret = IRQ_HANDLED;

                /*
                 * Theory on interrupt generation, based on empirical evidence:
                 *
                 * x = ((VLV_IIR & VLV_IER) ||
                 *      (((GT_IIR & GT_IER) || (GEN6_PMIIR & GEN6_PMIER)) &&
                 *       (VLV_MASTER_IER & MASTER_INTERRUPT_ENABLE)));
                 *
                 * A CPU interrupt will only be raised when 'x' has a 0->1 edge.
                 * Hence we clear MASTER_INTERRUPT_ENABLE and VLV_IER to
                 * guarantee the CPU interrupt will be raised again even if we
                 * don't end up clearing all the VLV_IIR, GT_IIR, GEN6_PMIIR
                 * bits this time around.
                 */
                I915_WRITE(VLV_MASTER_IER, 0);
                ier = I915_READ(VLV_IER);
                I915_WRITE(VLV_IER, 0);

                if (gt_iir)
                        I915_WRITE(GTIIR, gt_iir);
                if (pm_iir)
                        I915_WRITE(GEN6_PMIIR, pm_iir);

                if (iir & I915_DISPLAY_PORT_INTERRUPT)
                        hotplug_status = i9xx_hpd_irq_ack(dev_priv);

                /* Call regardless, as some status bits might not be
                 * signalled in iir */
                i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);

                if (iir & (I915_LPE_PIPE_A_INTERRUPT |
                           I915_LPE_PIPE_B_INTERRUPT))
                        intel_lpe_audio_irq_handler(dev_priv);

                /*
                 * VLV_IIR is single buffered, and reflects the level
                 * from PIPESTAT/PORT_HOTPLUG_STAT, hence clear it last.
                 */
                if (iir)
                        I915_WRITE(VLV_IIR, iir);

                I915_WRITE(VLV_IER, ier);
                I915_WRITE(VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE);

                if (gt_iir)
                        gen6_gt_irq_handler(&dev_priv->gt, gt_iir);
                if (pm_iir)
                        gen6_rps_irq_handler(&dev_priv->gt.rps, pm_iir);

                if (hotplug_status)
                        i9xx_hpd_irq_handler(dev_priv, hotplug_status);

                valleyview_pipestat_irq_handler(dev_priv, pipe_stats);
        } while (0);

        enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        return ret;
}

static irqreturn_t cherryview_irq_handler(int irq, void *arg)
{
        struct drm_i915_private *dev_priv = arg;
        irqreturn_t ret = IRQ_NONE;

        if (!intel_irqs_enabled(dev_priv))
                return IRQ_NONE;

        /* IRQs are synced during runtime_suspend, we don't require a wakeref */
        disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        do {
                u32 master_ctl, iir;
                u32 pipe_stats[I915_MAX_PIPES] = {};
                u32 hotplug_status = 0;
                u32 ier = 0;

                master_ctl = I915_READ(GEN8_MASTER_IRQ) & ~GEN8_MASTER_IRQ_CONTROL;
                iir = I915_READ(VLV_IIR);

                if (master_ctl == 0 && iir == 0)
                        break;

                ret = IRQ_HANDLED;

                /*
                 * Theory on interrupt generation, based on empirical evidence:
                 *
                 * x = ((VLV_IIR & VLV_IER) ||
                 *      ((GEN8_MASTER_IRQ & ~GEN8_MASTER_IRQ_CONTROL) &&
                 *       (GEN8_MASTER_IRQ & GEN8_MASTER_IRQ_CONTROL)));
                 *
                 * A CPU interrupt will only be raised when 'x' has a 0->1 edge.
                 * Hence we clear GEN8_MASTER_IRQ_CONTROL and VLV_IER to
                 * guarantee the CPU interrupt will be raised again even if we
                 * don't end up clearing all the VLV_IIR and GEN8_MASTER_IRQ_CONTROL
                 * bits this time around.
                 */
                I915_WRITE(GEN8_MASTER_IRQ, 0);
                ier = I915_READ(VLV_IER);
                I915_WRITE(VLV_IER, 0);

                gen8_gt_irq_handler(&dev_priv->gt, master_ctl);

                if (iir & I915_DISPLAY_PORT_INTERRUPT)
                        hotplug_status = i9xx_hpd_irq_ack(dev_priv);

                /* Call regardless, as some status bits might not be
                 * signalled in iir */
                i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);

                if (iir & (I915_LPE_PIPE_A_INTERRUPT |
                           I915_LPE_PIPE_B_INTERRUPT |
                           I915_LPE_PIPE_C_INTERRUPT))
                        intel_lpe_audio_irq_handler(dev_priv);

                /*
                 * VLV_IIR is single buffered, and reflects the level
                 * from PIPESTAT/PORT_HOTPLUG_STAT, hence clear it last.
                 */
                if (iir)
                        I915_WRITE(VLV_IIR, iir);

                I915_WRITE(VLV_IER, ier);
                I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);

                if (hotplug_status)
                        i9xx_hpd_irq_handler(dev_priv, hotplug_status);

                valleyview_pipestat_irq_handler(dev_priv, pipe_stats);
        } while (0);

        enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        return ret;
}

static void ibx_hpd_irq_handler(struct drm_i915_private *dev_priv,
                                u32 hotplug_trigger,
                                const u32 hpd[HPD_NUM_PINS])
{
        u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;

        /*
         * Somehow the PCH doesn't seem to really ack the interrupt to the CPU
         * unless we touch the hotplug register, even if hotplug_trigger is
         * zero. Not acking leads to "The master control interrupt lied (SDE)!"
         * errors.
         */
        dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
        if (!hotplug_trigger) {
                u32 mask = PORTA_HOTPLUG_STATUS_MASK |
                        PORTD_HOTPLUG_STATUS_MASK |
                        PORTC_HOTPLUG_STATUS_MASK |
                        PORTB_HOTPLUG_STATUS_MASK;
                dig_hotplug_reg &= ~mask;
        }

        I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
        if (!hotplug_trigger)
                return;

        intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask, hotplug_trigger,
                           dig_hotplug_reg, hpd,
                           pch_port_hotplug_long_detect);

        intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
}

static void ibx_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
{
        enum pipe pipe;
        u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;

        ibx_hpd_irq_handler(dev_priv, hotplug_trigger, hpd_ibx);

        if (pch_iir & SDE_AUDIO_POWER_MASK) {
                int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
                               SDE_AUDIO_POWER_SHIFT);
                drm_dbg(&dev_priv->drm, "PCH audio power change on port %d\n",
                        port_name(port));
        }

        if (pch_iir & SDE_AUX_MASK)
                dp_aux_irq_handler(dev_priv);

        if (pch_iir & SDE_GMBUS)
                gmbus_irq_handler(dev_priv);

        if (pch_iir & SDE_AUDIO_HDCP_MASK)
                drm_dbg(&dev_priv->drm, "PCH HDCP audio interrupt\n");

        if (pch_iir & SDE_AUDIO_TRANS_MASK)
                drm_dbg(&dev_priv->drm, "PCH transcoder audio interrupt\n");

        if (pch_iir & SDE_POISON)
                drm_err(&dev_priv->drm, "PCH poison interrupt\n");

        if (pch_iir & SDE_FDI_MASK) {
                for_each_pipe(dev_priv, pipe)
                        drm_dbg(&dev_priv->drm, "  pipe %c FDI IIR: 0x%08x\n",
                                pipe_name(pipe),
                                I915_READ(FDI_RX_IIR(pipe)));
        }

        if (pch_iir & (SDE_TRANSB_CRC_DONE | SDE_TRANSA_CRC_DONE))
                drm_dbg(&dev_priv->drm, "PCH transcoder CRC done interrupt\n");

        if (pch_iir & (SDE_TRANSB_CRC_ERR | SDE_TRANSA_CRC_ERR))
                drm_dbg(&dev_priv->drm,
                        "PCH transcoder CRC error interrupt\n");

        if (pch_iir & SDE_TRANSA_FIFO_UNDER)
                intel_pch_fifo_underrun_irq_handler(dev_priv, PIPE_A);

        if (pch_iir & SDE_TRANSB_FIFO_UNDER)
                intel_pch_fifo_underrun_irq_handler(dev_priv, PIPE_B);
}

static void ivb_err_int_handler(struct drm_i915_private *dev_priv)
{
        u32 err_int = I915_READ(GEN7_ERR_INT);
        enum pipe pipe;

        if (err_int & ERR_INT_POISON)
                drm_err(&dev_priv->drm, "Poison interrupt\n");

        for_each_pipe(dev_priv, pipe) {
                if (err_int & ERR_INT_FIFO_UNDERRUN(pipe))
                        intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);

                if (err_int & ERR_INT_PIPE_CRC_DONE(pipe)) {
                        if (IS_IVYBRIDGE(dev_priv))
                                ivb_pipe_crc_irq_handler(dev_priv, pipe);
                        else
                                hsw_pipe_crc_irq_handler(dev_priv, pipe);
                }
        }

        I915_WRITE(GEN7_ERR_INT, err_int);
}

static void cpt_serr_int_handler(struct drm_i915_private *dev_priv)
{
        u32 serr_int = I915_READ(SERR_INT);
        enum pipe pipe;

        if (serr_int & SERR_INT_POISON)
                drm_err(&dev_priv->drm, "PCH poison interrupt\n");

        for_each_pipe(dev_priv, pipe)
                if (serr_int & SERR_INT_TRANS_FIFO_UNDERRUN(pipe))
                        intel_pch_fifo_underrun_irq_handler(dev_priv, pipe);

        I915_WRITE(SERR_INT, serr_int);
}

static void cpt_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
{
        enum pipe pipe;
        u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;

        ibx_hpd_irq_handler(dev_priv, hotplug_trigger, hpd_cpt);

        if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
                int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
                               SDE_AUDIO_POWER_SHIFT_CPT);
                drm_dbg(&dev_priv->drm, "PCH audio power change on port %c\n",
                        port_name(port));
        }

        if (pch_iir & SDE_AUX_MASK_CPT)
                dp_aux_irq_handler(dev_priv);

        if (pch_iir & SDE_GMBUS_CPT)
                gmbus_irq_handler(dev_priv);

        if (pch_iir & SDE_AUDIO_CP_REQ_CPT)
                drm_dbg(&dev_priv->drm, "Audio CP request interrupt\n");

        if (pch_iir & SDE_AUDIO_CP_CHG_CPT)
                drm_dbg(&dev_priv->drm, "Audio CP change interrupt\n");

        if (pch_iir & SDE_FDI_MASK_CPT) {
                for_each_pipe(dev_priv, pipe)
                        drm_dbg(&dev_priv->drm, "  pipe %c FDI IIR: 0x%08x\n",
                                pipe_name(pipe),
                                I915_READ(FDI_RX_IIR(pipe)));
        }

        if (pch_iir & SDE_ERROR_CPT)
                cpt_serr_int_handler(dev_priv);
}

static void icp_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
{
        u32 ddi_hotplug_trigger, tc_hotplug_trigger;
        u32 pin_mask = 0, long_mask = 0;
        bool (*tc_port_hotplug_long_detect)(enum hpd_pin pin, u32 val);
        const u32 *pins;

        if (HAS_PCH_TGP(dev_priv)) {
                ddi_hotplug_trigger = pch_iir & SDE_DDI_MASK_TGP;
                tc_hotplug_trigger = pch_iir & SDE_TC_MASK_TGP;
                tc_port_hotplug_long_detect = tgp_tc_port_hotplug_long_detect;
                pins = hpd_tgp;
        } else if (HAS_PCH_JSP(dev_priv)) {
                ddi_hotplug_trigger = pch_iir & SDE_DDI_MASK_TGP;
                tc_hotplug_trigger = 0;
                pins = hpd_tgp;
        } else if (HAS_PCH_MCC(dev_priv)) {
                ddi_hotplug_trigger = pch_iir & SDE_DDI_MASK_ICP;
                tc_hotplug_trigger = pch_iir & SDE_TC_HOTPLUG_ICP(PORT_TC1);
                tc_port_hotplug_long_detect = icp_tc_port_hotplug_long_detect;
                pins = hpd_icp;
        } else {
                drm_WARN(&dev_priv->drm, !HAS_PCH_ICP(dev_priv),
                         "Unrecognized PCH type 0x%x\n",
                         INTEL_PCH_TYPE(dev_priv));

                ddi_hotplug_trigger = pch_iir & SDE_DDI_MASK_ICP;
                tc_hotplug_trigger = pch_iir & SDE_TC_MASK_ICP;
                tc_port_hotplug_long_detect = icp_tc_port_hotplug_long_detect;
                pins = hpd_icp;
        }

        if (ddi_hotplug_trigger) {
                u32 dig_hotplug_reg;

                dig_hotplug_reg = I915_READ(SHOTPLUG_CTL_DDI);
                I915_WRITE(SHOTPLUG_CTL_DDI, dig_hotplug_reg);

                intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
                                   ddi_hotplug_trigger,
                                   dig_hotplug_reg, pins,
                                   icp_ddi_port_hotplug_long_detect);
        }

        if (tc_hotplug_trigger) {
                u32 dig_hotplug_reg;

                dig_hotplug_reg = I915_READ(SHOTPLUG_CTL_TC);
                I915_WRITE(SHOTPLUG_CTL_TC, dig_hotplug_reg);

                intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
                                   tc_hotplug_trigger,
                                   dig_hotplug_reg, pins,
                                   tc_port_hotplug_long_detect);
        }

        if (pin_mask)
                intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);

        if (pch_iir & SDE_GMBUS_ICP)
                gmbus_irq_handler(dev_priv);
}

static void spt_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
{
        u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_SPT &
                ~SDE_PORTE_HOTPLUG_SPT;
        u32 hotplug2_trigger = pch_iir & SDE_PORTE_HOTPLUG_SPT;
        u32 pin_mask = 0, long_mask = 0;

        if (hotplug_trigger) {
                u32 dig_hotplug_reg;

                dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
                I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);

                intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
                                   hotplug_trigger, dig_hotplug_reg, hpd_spt,
                                   spt_port_hotplug_long_detect);
        }

        if (hotplug2_trigger) {
                u32 dig_hotplug_reg;

                dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG2);
                I915_WRITE(PCH_PORT_HOTPLUG2, dig_hotplug_reg);

                intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
                                   hotplug2_trigger, dig_hotplug_reg, hpd_spt,
                                   spt_port_hotplug2_long_detect);
        }

        if (pin_mask)
                intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);

        if (pch_iir & SDE_GMBUS_CPT)
                gmbus_irq_handler(dev_priv);
}

static void ilk_hpd_irq_handler(struct drm_i915_private *dev_priv,
                                u32 hotplug_trigger,
                                const u32 hpd[HPD_NUM_PINS])
{
        u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;

        dig_hotplug_reg = I915_READ(DIGITAL_PORT_HOTPLUG_CNTRL);
        I915_WRITE(DIGITAL_PORT_HOTPLUG_CNTRL, dig_hotplug_reg);

        intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask, hotplug_trigger,
                           dig_hotplug_reg, hpd,
                           ilk_port_hotplug_long_detect);

        intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
}

static void ilk_display_irq_handler(struct drm_i915_private *dev_priv,
                                    u32 de_iir)
{
        enum pipe pipe;
        u32 hotplug_trigger = de_iir & DE_DP_A_HOTPLUG;

        if (hotplug_trigger)
                ilk_hpd_irq_handler(dev_priv, hotplug_trigger, hpd_ilk);

        if (de_iir & DE_AUX_CHANNEL_A)
                dp_aux_irq_handler(dev_priv);

        if (de_iir & DE_GSE)
                intel_opregion_asle_intr(dev_priv);

        if (de_iir & DE_POISON)
                drm_err(&dev_priv->drm, "Poison interrupt\n");

        for_each_pipe(dev_priv, pipe) {
                if (de_iir & DE_PIPE_VBLANK(pipe))
                        intel_handle_vblank(dev_priv, pipe);

                if (de_iir & DE_PIPE_FIFO_UNDERRUN(pipe))
                        intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);

                if (de_iir & DE_PIPE_CRC_DONE(pipe))
                        i9xx_pipe_crc_irq_handler(dev_priv, pipe);
        }

        /* check event from PCH */
        if (de_iir & DE_PCH_EVENT) {

                u32 pch_iir = I915_READ(SDEIIR);

                if (HAS_PCH_CPT(dev_priv))
                        cpt_irq_handler(dev_priv, pch_iir);
                else
                        ibx_irq_handler(dev_priv, pch_iir);

                /* should clear PCH hotplug event before clear CPU irq */
                I915_WRITE(SDEIIR, pch_iir);
        }

        if (IS_GEN(dev_priv, 5) && de_iir & DE_PCU_EVENT)
                gen5_rps_irq_handler(&dev_priv->gt.rps);
}

static void ivb_display_irq_handler(struct drm_i915_private *dev_priv,
                                    u32 de_iir)
{
        enum pipe pipe;
        u32 hotplug_trigger = de_iir & DE_DP_A_HOTPLUG_IVB;

        if (hotplug_trigger)
                ilk_hpd_irq_handler(dev_priv, hotplug_trigger, hpd_ivb);

        if (de_iir & DE_ERR_INT_IVB)
                ivb_err_int_handler(dev_priv);

        if (de_iir & DE_EDP_PSR_INT_HSW) {
                u32 psr_iir = I915_READ(EDP_PSR_IIR);

                intel_psr_irq_handler(dev_priv, psr_iir);
                I915_WRITE(EDP_PSR_IIR, psr_iir);
        }

        if (de_iir & DE_AUX_CHANNEL_A_IVB)
                dp_aux_irq_handler(dev_priv);

        if (de_iir & DE_GSE_IVB)
                intel_opregion_asle_intr(dev_priv);

        for_each_pipe(dev_priv, pipe) {
                if (de_iir & (DE_PIPE_VBLANK_IVB(pipe)))
                        intel_handle_vblank(dev_priv, pipe);
        }

        /* check event from PCH */
        if (!HAS_PCH_NOP(dev_priv) && (de_iir & DE_PCH_EVENT_IVB)) {
                u32 pch_iir = I915_READ(SDEIIR);

                cpt_irq_handler(dev_priv, pch_iir);

                /* clear PCH hotplug event before clear CPU irq */
                I915_WRITE(SDEIIR, pch_iir);
        }
}

/*
 * To handle irqs with the minimum potential races with fresh interrupts, we:
 * 1 - Disable Master Interrupt Control.
 * 2 - Find the source(s) of the interrupt.
 * 3 - Clear the Interrupt Identity bits (IIR).
 * 4 - Process the interrupt(s) that had bits set in the IIRs.
 * 5 - Re-enable Master Interrupt Control.
 */
static irqreturn_t ilk_irq_handler(int irq, void *arg)
{
        struct drm_i915_private *dev_priv = arg;
        u32 de_iir, gt_iir, de_ier, sde_ier = 0;
        irqreturn_t ret = IRQ_NONE;

        if (!intel_irqs_enabled(dev_priv))
                return IRQ_NONE;

        /* IRQs are synced during runtime_suspend, we don't require a wakeref */
        disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        /* disable master interrupt before clearing iir  */
        de_ier = I915_READ(DEIER);
        I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);

        /* Disable south interrupts. We'll only write to SDEIIR once, so further
         * interrupts will will be stored on its back queue, and then we'll be
         * able to process them after we restore SDEIER (as soon as we restore
         * it, we'll get an interrupt if SDEIIR still has something to process
         * due to its back queue). */
        if (!HAS_PCH_NOP(dev_priv)) {
                sde_ier = I915_READ(SDEIER);
                I915_WRITE(SDEIER, 0);
        }

        /* Find, clear, then process each source of interrupt */

        gt_iir = I915_READ(GTIIR);
        if (gt_iir) {
                I915_WRITE(GTIIR, gt_iir);
                ret = IRQ_HANDLED;
                if (INTEL_GEN(dev_priv) >= 6)
                        gen6_gt_irq_handler(&dev_priv->gt, gt_iir);
                else
                        gen5_gt_irq_handler(&dev_priv->gt, gt_iir);
        }

        de_iir = I915_READ(DEIIR);
        if (de_iir) {
                I915_WRITE(DEIIR, de_iir);
                ret = IRQ_HANDLED;
                if (INTEL_GEN(dev_priv) >= 7)
                        ivb_display_irq_handler(dev_priv, de_iir);
                else
                        ilk_display_irq_handler(dev_priv, de_iir);
        }

        if (INTEL_GEN(dev_priv) >= 6) {
                u32 pm_iir = I915_READ(GEN6_PMIIR);
                if (pm_iir) {
                        I915_WRITE(GEN6_PMIIR, pm_iir);
                        ret = IRQ_HANDLED;
                        gen6_rps_irq_handler(&dev_priv->gt.rps, pm_iir);
                }
        }

        I915_WRITE(DEIER, de_ier);
        if (!HAS_PCH_NOP(dev_priv))
                I915_WRITE(SDEIER, sde_ier);

        /* IRQs are synced during runtime_suspend, we don't require a wakeref */
        enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        return ret;
}

static void bxt_hpd_irq_handler(struct drm_i915_private *dev_priv,
                                u32 hotplug_trigger,
                                const u32 hpd[HPD_NUM_PINS])
{
        u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;

        dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
        I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);

        intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask, hotplug_trigger,
                           dig_hotplug_reg, hpd,
                           bxt_port_hotplug_long_detect);

        intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
}

static void gen11_hpd_irq_handler(struct drm_i915_private *dev_priv, u32 iir)
{
        u32 pin_mask = 0, long_mask = 0;
        u32 trigger_tc = iir & GEN11_DE_TC_HOTPLUG_MASK;
        u32 trigger_tbt = iir & GEN11_DE_TBT_HOTPLUG_MASK;
        long_pulse_detect_func long_pulse_detect;
        const u32 *hpd;

        if (INTEL_GEN(dev_priv) >= 12) {
                long_pulse_detect = gen12_port_hotplug_long_detect;
                hpd = hpd_gen12;
        } else {
                long_pulse_detect = gen11_port_hotplug_long_detect;
                hpd = hpd_gen11;
        }

        if (trigger_tc) {
                u32 dig_hotplug_reg;

                dig_hotplug_reg = I915_READ(GEN11_TC_HOTPLUG_CTL);
                I915_WRITE(GEN11_TC_HOTPLUG_CTL, dig_hotplug_reg);

                intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask, trigger_tc,
                                   dig_hotplug_reg, hpd, long_pulse_detect);
        }

        if (trigger_tbt) {
                u32 dig_hotplug_reg;

                dig_hotplug_reg = I915_READ(GEN11_TBT_HOTPLUG_CTL);
                I915_WRITE(GEN11_TBT_HOTPLUG_CTL, dig_hotplug_reg);

                intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask, trigger_tbt,
                                   dig_hotplug_reg, hpd, long_pulse_detect);
        }

        if (pin_mask)
                intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
        else
                drm_err(&dev_priv->drm,
                        "Unexpected DE HPD interrupt 0x%08x\n", iir);
}

static u32 gen8_de_port_aux_mask(struct drm_i915_private *dev_priv)
{
        u32 mask;

        if (INTEL_GEN(dev_priv) >= 12)
                return TGL_DE_PORT_AUX_DDIA |
                        TGL_DE_PORT_AUX_DDIB |
                        TGL_DE_PORT_AUX_DDIC |
                        TGL_DE_PORT_AUX_USBC1 |
                        TGL_DE_PORT_AUX_USBC2 |
                        TGL_DE_PORT_AUX_USBC3 |
                        TGL_DE_PORT_AUX_USBC4 |
                        TGL_DE_PORT_AUX_USBC5 |
                        TGL_DE_PORT_AUX_USBC6;


        mask = GEN8_AUX_CHANNEL_A;
        if (INTEL_GEN(dev_priv) >= 9)
                mask |= GEN9_AUX_CHANNEL_B |
                        GEN9_AUX_CHANNEL_C |
                        GEN9_AUX_CHANNEL_D;

        if (IS_CNL_WITH_PORT_F(dev_priv) || IS_GEN(dev_priv, 11))
                mask |= CNL_AUX_CHANNEL_F;

        if (IS_GEN(dev_priv, 11))
                mask |= ICL_AUX_CHANNEL_E;

        return mask;
}

static u32 gen8_de_pipe_fault_mask(struct drm_i915_private *dev_priv)
{
        if (INTEL_GEN(dev_priv) >= 11)
                return GEN11_DE_PIPE_IRQ_FAULT_ERRORS;
        else if (INTEL_GEN(dev_priv) >= 9)
                return GEN9_DE_PIPE_IRQ_FAULT_ERRORS;
        else
                return GEN8_DE_PIPE_IRQ_FAULT_ERRORS;
}

static void
gen8_de_misc_irq_handler(struct drm_i915_private *dev_priv, u32 iir)
{
        bool found = false;

        if (iir & GEN8_DE_MISC_GSE) {
                intel_opregion_asle_intr(dev_priv);
                found = true;
        }

        if (iir & GEN8_DE_EDP_PSR) {
                u32 psr_iir;
                i915_reg_t iir_reg;

                if (INTEL_GEN(dev_priv) >= 12)
                        iir_reg = TRANS_PSR_IIR(dev_priv->psr.transcoder);
                else
                        iir_reg = EDP_PSR_IIR;

                psr_iir = I915_READ(iir_reg);
                I915_WRITE(iir_reg, psr_iir);

                if (psr_iir)
                        found = true;

                intel_psr_irq_handler(dev_priv, psr_iir);
        }

        if (!found)
                drm_err(&dev_priv->drm, "Unexpected DE Misc interrupt\n");
}

static irqreturn_t
gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
{
        irqreturn_t ret = IRQ_NONE;
        u32 iir;
        enum pipe pipe;

        if (master_ctl & GEN8_DE_MISC_IRQ) {
                iir = I915_READ(GEN8_DE_MISC_IIR);
                if (iir) {
                        I915_WRITE(GEN8_DE_MISC_IIR, iir);
                        ret = IRQ_HANDLED;
                        gen8_de_misc_irq_handler(dev_priv, iir);
                } else {
                        drm_err(&dev_priv->drm,
                                "The master control interrupt lied (DE MISC)!\n");
                }
        }

        if (INTEL_GEN(dev_priv) >= 11 && (master_ctl & GEN11_DE_HPD_IRQ)) {
                iir = I915_READ(GEN11_DE_HPD_IIR);
                if (iir) {
                        I915_WRITE(GEN11_DE_HPD_IIR, iir);
                        ret = IRQ_HANDLED;
                        gen11_hpd_irq_handler(dev_priv, iir);
                } else {
                        drm_err(&dev_priv->drm,
                                "The master control interrupt lied, (DE HPD)!\n");
                }
        }

        if (master_ctl & GEN8_DE_PORT_IRQ) {
                iir = I915_READ(GEN8_DE_PORT_IIR);
                if (iir) {
                        u32 tmp_mask;
                        bool found = false;

                        I915_WRITE(GEN8_DE_PORT_IIR, iir);
                        ret = IRQ_HANDLED;

                        if (iir & gen8_de_port_aux_mask(dev_priv)) {
                                dp_aux_irq_handler(dev_priv);
                                found = true;
                        }

                        if (IS_GEN9_LP(dev_priv)) {
                                tmp_mask = iir & BXT_DE_PORT_HOTPLUG_MASK;
                                if (tmp_mask) {
                                        bxt_hpd_irq_handler(dev_priv, tmp_mask,
                                                            hpd_bxt);
                                        found = true;
                                }
                        } else if (IS_BROADWELL(dev_priv)) {
                                tmp_mask = iir & GEN8_PORT_DP_A_HOTPLUG;
                                if (tmp_mask) {
                                        ilk_hpd_irq_handler(dev_priv,
                                                            tmp_mask, hpd_bdw);
                                        found = true;
                                }
                        }

                        if (IS_GEN9_LP(dev_priv) && (iir & BXT_DE_PORT_GMBUS)) {
                                gmbus_irq_handler(dev_priv);
                                found = true;
                        }

                        if (!found)
                                drm_err(&dev_priv->drm,
                                        "Unexpected DE Port interrupt\n");
                }
                else
                        drm_err(&dev_priv->drm,
                                "The master control interrupt lied (DE PORT)!\n");
        }

        for_each_pipe(dev_priv, pipe) {
                u32 fault_errors;

                if (!(master_ctl & GEN8_DE_PIPE_IRQ(pipe)))
                        continue;

                iir = I915_READ(GEN8_DE_PIPE_IIR(pipe));
                if (!iir) {
                        drm_err(&dev_priv->drm,
                                "The master control interrupt lied (DE PIPE)!\n");
                        continue;
                }

                ret = IRQ_HANDLED;
                I915_WRITE(GEN8_DE_PIPE_IIR(pipe), iir);

                if (iir & GEN8_PIPE_VBLANK)
                        intel_handle_vblank(dev_priv, pipe);

                if (iir & GEN8_PIPE_CDCLK_CRC_DONE)
                        hsw_pipe_crc_irq_handler(dev_priv, pipe);

                if (iir & GEN8_PIPE_FIFO_UNDERRUN)
                        intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);

                fault_errors = iir & gen8_de_pipe_fault_mask(dev_priv);
                if (fault_errors)
                        drm_err(&dev_priv->drm,
                                "Fault errors on pipe %c: 0x%08x\n",
                                pipe_name(pipe),
                                fault_errors);
        }

        if (HAS_PCH_SPLIT(dev_priv) && !HAS_PCH_NOP(dev_priv) &&
            master_ctl & GEN8_DE_PCH_IRQ) {
                /*
                 * FIXME(BDW): Assume for now that the new interrupt handling
                 * scheme also closed the SDE interrupt handling race we've seen
                 * on older pch-split platforms. But this needs testing.
                 */
                iir = I915_READ(SDEIIR);
                if (iir) {
                        I915_WRITE(SDEIIR, iir);
                        ret = IRQ_HANDLED;

                        if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
                                icp_irq_handler(dev_priv, iir);
                        else if (INTEL_PCH_TYPE(dev_priv) >= PCH_SPT)
                                spt_irq_handler(dev_priv, iir);
                        else
                                cpt_irq_handler(dev_priv, iir);
                } else {
                        /*
                         * Like on previous PCH there seems to be something
                         * fishy going on with forwarding PCH interrupts.
                         */
                        drm_dbg(&dev_priv->drm,
                                "The master control interrupt lied (SDE)!\n");
                }
        }

        return ret;
}

static inline u32 gen8_master_intr_disable(void __iomem * const regs)
{
        raw_reg_write(regs, GEN8_MASTER_IRQ, 0);

        /*
         * Now with master disabled, get a sample of level indications
         * for this interrupt. Indications will be cleared on related acks.
         * New indications can and will light up during processing,
         * and will generate new interrupt after enabling master.
         */
        return raw_reg_read(regs, GEN8_MASTER_IRQ);
}

static inline void gen8_master_intr_enable(void __iomem * const regs)
{
        raw_reg_write(regs, GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
}

static irqreturn_t gen8_irq_handler(int irq, void *arg)
{
        struct drm_i915_private *dev_priv = arg;
        void __iomem * const regs = dev_priv->uncore.regs;
        u32 master_ctl;

        if (!intel_irqs_enabled(dev_priv))
                return IRQ_NONE;

        master_ctl = gen8_master_intr_disable(regs);
        if (!master_ctl) {
                gen8_master_intr_enable(regs);
                return IRQ_NONE;
        }

        /* Find, queue (onto bottom-halves), then clear each source */
        gen8_gt_irq_handler(&dev_priv->gt, master_ctl);

        /* IRQs are synced during runtime_suspend, we don't require a wakeref */
        if (master_ctl & ~GEN8_GT_IRQS) {
                disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
                gen8_de_irq_handler(dev_priv, master_ctl);
                enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
        }

        gen8_master_intr_enable(regs);

        return IRQ_HANDLED;
}

static u32
gen11_gu_misc_irq_ack(struct intel_gt *gt, const u32 master_ctl)
{
        void __iomem * const regs = gt->uncore->regs;
        u32 iir;

        if (!(master_ctl & GEN11_GU_MISC_IRQ))
                return 0;

        iir = raw_reg_read(regs, GEN11_GU_MISC_IIR);
        if (likely(iir))
                raw_reg_write(regs, GEN11_GU_MISC_IIR, iir);

        return iir;
}

static void
gen11_gu_misc_irq_handler(struct intel_gt *gt, const u32 iir)
{
        if (iir & GEN11_GU_MISC_GSE)
                intel_opregion_asle_intr(gt->i915);
}

static inline u32 gen11_master_intr_disable(void __iomem * const regs)
{
        raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, 0);

        /*
         * Now with master disabled, get a sample of level indications
         * for this interrupt. Indications will be cleared on related acks.
         * New indications can and will light up during processing,
         * and will generate new interrupt after enabling master.
         */
        return raw_reg_read(regs, GEN11_GFX_MSTR_IRQ);
}

static inline void gen11_master_intr_enable(void __iomem * const regs)
{
        raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, GEN11_MASTER_IRQ);
}

static void
gen11_display_irq_handler(struct drm_i915_private *i915)
{
        void __iomem * const regs = i915->uncore.regs;
        const u32 disp_ctl = raw_reg_read(regs, GEN11_DISPLAY_INT_CTL);

        disable_rpm_wakeref_asserts(&i915->runtime_pm);
        /*
         * GEN11_DISPLAY_INT_CTL has same format as GEN8_MASTER_IRQ
         * for the display related bits.
         */
        raw_reg_write(regs, GEN11_DISPLAY_INT_CTL, 0x0);
        gen8_de_irq_handler(i915, disp_ctl);
        raw_reg_write(regs, GEN11_DISPLAY_INT_CTL,
                      GEN11_DISPLAY_IRQ_ENABLE);

        enable_rpm_wakeref_asserts(&i915->runtime_pm);
}

static __always_inline irqreturn_t
__gen11_irq_handler(struct drm_i915_private * const i915,
                    u32 (*intr_disable)(void __iomem * const regs),
                    void (*intr_enable)(void __iomem * const regs))
{
        void __iomem * const regs = i915->uncore.regs;
        struct intel_gt *gt = &i915->gt;
        u32 master_ctl;
        u32 gu_misc_iir;

        if (!intel_irqs_enabled(i915))
                return IRQ_NONE;

        master_ctl = intr_disable(regs);
        if (!master_ctl) {
                intr_enable(regs);
                return IRQ_NONE;
        }

        /* Find, queue (onto bottom-halves), then clear each source */
        gen11_gt_irq_handler(gt, master_ctl);

        /* IRQs are synced during runtime_suspend, we don't require a wakeref */
        if (master_ctl & GEN11_DISPLAY_IRQ)
                gen11_display_irq_handler(i915);

        gu_misc_iir = gen11_gu_misc_irq_ack(gt, master_ctl);

        intr_enable(regs);

        gen11_gu_misc_irq_handler(gt, gu_misc_iir);

        return IRQ_HANDLED;
}

static irqreturn_t gen11_irq_handler(int irq, void *arg)
{
        return __gen11_irq_handler(arg,
                                   gen11_master_intr_disable,
                                   gen11_master_intr_enable);
}

/* Called from drm generic code, passed 'crtc' which
 * we use as a pipe index
 */
int i8xx_enable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        unsigned long irqflags;

        spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
        i915_enable_pipestat(dev_priv, pipe, PIPE_VBLANK_INTERRUPT_STATUS);
        spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);

        return 0;
}

int i915gm_enable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);

        /*
         * Vblank interrupts fail to wake the device up from C2+.
         * Disabling render clock gating during C-states avoids
         * the problem. There is a small power cost so we do this
         * only when vblank interrupts are actually enabled.
         */
        if (dev_priv->vblank_enabled++ == 0)
                I915_WRITE(SCPD0, _MASKED_BIT_ENABLE(CSTATE_RENDER_CLOCK_GATE_DISABLE));

        return i8xx_enable_vblank(crtc);
}

int i965_enable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        unsigned long irqflags;

        spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
        i915_enable_pipestat(dev_priv, pipe,
                             PIPE_START_VBLANK_INTERRUPT_STATUS);
        spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);

        return 0;
}

int ilk_enable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        unsigned long irqflags;
        u32 bit = INTEL_GEN(dev_priv) >= 7 ?
                DE_PIPE_VBLANK_IVB(pipe) : DE_PIPE_VBLANK(pipe);

        spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
        ilk_enable_display_irq(dev_priv, bit);
        spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);

        /* Even though there is no DMC, frame counter can get stuck when
         * PSR is active as no frames are generated.
         */
        if (HAS_PSR(dev_priv))
                drm_crtc_vblank_restore(crtc);

        return 0;
}

int bdw_enable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        unsigned long irqflags;

        spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
        bdw_enable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
        spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);

        /* Even if there is no DMC, frame counter can get stuck when
         * PSR is active as no frames are generated, so check only for PSR.
         */
        if (HAS_PSR(dev_priv))
                drm_crtc_vblank_restore(crtc);

        return 0;
}

/* Called from drm generic code, passed 'crtc' which
 * we use as a pipe index
 */
void i8xx_disable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        unsigned long irqflags;

        spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
        i915_disable_pipestat(dev_priv, pipe, PIPE_VBLANK_INTERRUPT_STATUS);
        spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}

void i915gm_disable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);

        i8xx_disable_vblank(crtc);

        if (--dev_priv->vblank_enabled == 0)
                I915_WRITE(SCPD0, _MASKED_BIT_DISABLE(CSTATE_RENDER_CLOCK_GATE_DISABLE));
}

void i965_disable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        unsigned long irqflags;

        spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
        i915_disable_pipestat(dev_priv, pipe,
                              PIPE_START_VBLANK_INTERRUPT_STATUS);
        spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}

void ilk_disable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        unsigned long irqflags;
        u32 bit = INTEL_GEN(dev_priv) >= 7 ?
                DE_PIPE_VBLANK_IVB(pipe) : DE_PIPE_VBLANK(pipe);

        spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
        ilk_disable_display_irq(dev_priv, bit);
        spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}

void bdw_disable_vblank(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        unsigned long irqflags;

        spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
        bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
        spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}

static void ibx_irq_reset(struct drm_i915_private *dev_priv)
{
        struct intel_uncore *uncore = &dev_priv->uncore;

        if (HAS_PCH_NOP(dev_priv))
                return;

        GEN3_IRQ_RESET(uncore, SDE);

        if (HAS_PCH_CPT(dev_priv) || HAS_PCH_LPT(dev_priv))
                I915_WRITE(SERR_INT, 0xffffffff);
}

/*
 * SDEIER is also touched by the interrupt handler to work around missed PCH
 * interrupts. Hence we can't update it after the interrupt handler is enabled -
 * instead we unconditionally enable all PCH interrupt sources here, but then
 * only unmask them as needed with SDEIMR.
 *
 * This function needs to be called before interrupts are enabled.
 */
static void ibx_irq_pre_postinstall(struct drm_i915_private *dev_priv)
{
        if (HAS_PCH_NOP(dev_priv))
                return;

        drm_WARN_ON(&dev_priv->drm, I915_READ(SDEIER) != 0);
        I915_WRITE(SDEIER, 0xffffffff);
        POSTING_READ(SDEIER);
}

static void vlv_display_irq_reset(struct drm_i915_private *dev_priv)
{
        struct intel_uncore *uncore = &dev_priv->uncore;

        if (IS_CHERRYVIEW(dev_priv))
                intel_uncore_write(uncore, DPINVGTT, DPINVGTT_STATUS_MASK_CHV);
        else
                intel_uncore_write(uncore, DPINVGTT, DPINVGTT_STATUS_MASK);

        i915_hotplug_interrupt_update_locked(dev_priv, 0xffffffff, 0);
        intel_uncore_write(uncore, PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));

        i9xx_pipestat_irq_reset(dev_priv);

        GEN3_IRQ_RESET(uncore, VLV_);
        dev_priv->irq_mask = ~0u;
}

static void vlv_display_irq_postinstall(struct drm_i915_private *dev_priv)
{
        struct intel_uncore *uncore = &dev_priv->uncore;

        u32 pipestat_mask;
        u32 enable_mask;
        enum pipe pipe;

        pipestat_mask = PIPE_CRC_DONE_INTERRUPT_STATUS;

        i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_INTERRUPT_STATUS);
        for_each_pipe(dev_priv, pipe)
                i915_enable_pipestat(dev_priv, pipe, pipestat_mask);

        enable_mask = I915_DISPLAY_PORT_INTERRUPT |
                I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
                I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
                I915_LPE_PIPE_A_INTERRUPT |
                I915_LPE_PIPE_B_INTERRUPT;

        if (IS_CHERRYVIEW(dev_priv))
                enable_mask |= I915_DISPLAY_PIPE_C_EVENT_INTERRUPT |
                        I915_LPE_PIPE_C_INTERRUPT;

        drm_WARN_ON(&dev_priv->drm, dev_priv->irq_mask != ~0u);

        dev_priv->irq_mask = ~enable_mask;

        GEN3_IRQ_INIT(uncore, VLV_, dev_priv->irq_mask, enable_mask);
}

/* drm_dma.h hooks
*/
static void ilk_irq_reset(struct drm_i915_private *dev_priv)
{
        struct intel_uncore *uncore = &dev_priv->uncore;

        GEN3_IRQ_RESET(uncore, DE);
        if (IS_GEN(dev_priv, 7))
                intel_uncore_write(uncore, GEN7_ERR_INT, 0xffffffff);

        if (IS_HASWELL(dev_priv)) {
                intel_uncore_write(uncore, EDP_PSR_IMR, 0xffffffff);
                intel_uncore_write(uncore, EDP_PSR_IIR, 0xffffffff);
        }

        gen5_gt_irq_reset(&dev_priv->gt);

        ibx_irq_reset(dev_priv);
}

static void valleyview_irq_reset(struct drm_i915_private *dev_priv)
{
        I915_WRITE(VLV_MASTER_IER, 0);
        POSTING_READ(VLV_MASTER_IER);

        gen5_gt_irq_reset(&dev_priv->gt);

        spin_lock_irq(&dev_priv->irq_lock);
        if (dev_priv->display_irqs_enabled)
                vlv_display_irq_reset(dev_priv);
        spin_unlock_irq(&dev_priv->irq_lock);
}

static void gen8_irq_reset(struct drm_i915_private *dev_priv)
{
        struct intel_uncore *uncore = &dev_priv->uncore;
        enum pipe pipe;

        gen8_master_intr_disable(dev_priv->uncore.regs);

        gen8_gt_irq_reset(&dev_priv->gt);

        intel_uncore_write(uncore, EDP_PSR_IMR, 0xffffffff);
        intel_uncore_write(uncore, EDP_PSR_IIR, 0xffffffff);

        for_each_pipe(dev_priv, pipe)
                if (intel_display_power_is_enabled(dev_priv,
                                                   POWER_DOMAIN_PIPE(pipe)))
                        GEN8_IRQ_RESET_NDX(uncore, DE_PIPE, pipe);

        GEN3_IRQ_RESET(uncore, GEN8_DE_PORT_);
        GEN3_IRQ_RESET(uncore, GEN8_DE_MISC_);
        GEN3_IRQ_RESET(uncore, GEN8_PCU_);

        if (HAS_PCH_SPLIT(dev_priv))
                ibx_irq_reset(dev_priv);
}

static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
{
        struct intel_uncore *uncore = &dev_priv->uncore;
        enum pipe pipe;

        intel_uncore_write(uncore, GEN11_DISPLAY_INT_CTL, 0);

        if (INTEL_GEN(dev_priv) >= 12) {
                enum transcoder trans;

                for (trans = TRANSCODER_A; trans <= TRANSCODER_D; trans++) {
                        enum intel_display_power_domain domain;

                        domain = POWER_DOMAIN_TRANSCODER(trans);
                        if (!intel_display_power_is_enabled(dev_priv, domain))
                                continue;

                        intel_uncore_write(uncore, TRANS_PSR_IMR(trans), 0xffffffff);
                        intel_uncore_write(uncore, TRANS_PSR_IIR(trans), 0xffffffff);
                }
        } else {
                intel_uncore_write(uncore, EDP_PSR_IMR, 0xffffffff);
                intel_uncore_write(uncore, EDP_PSR_IIR, 0xffffffff);
        }

        for_each_pipe(dev_priv, pipe)
                if (intel_display_power_is_enabled(dev_priv,
                                                   POWER_DOMAIN_PIPE(pipe)))
                        GEN8_IRQ_RESET_NDX(uncore, DE_PIPE, pipe);

        GEN3_IRQ_RESET(uncore, GEN8_DE_PORT_);
        GEN3_IRQ_RESET(uncore, GEN8_DE_MISC_);
        GEN3_IRQ_RESET(uncore, GEN11_DE_HPD_);

        if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
                GEN3_IRQ_RESET(uncore, SDE);
}

static void gen11_irq_reset(struct drm_i915_private *dev_priv)
{
        struct intel_uncore *uncore = &dev_priv->uncore;

        gen11_master_intr_disable(dev_priv->uncore.regs);

        gen11_gt_irq_reset(&dev_priv->gt);
        gen11_display_irq_reset(dev_priv);

        GEN3_IRQ_RESET(uncore, GEN11_GU_MISC_);
        GEN3_IRQ_RESET(uncore, GEN8_PCU_);
}

void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv,
                                     u8 pipe_mask)
{
        struct intel_uncore *uncore = &dev_priv->uncore;

        u32 extra_ier = GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN;
        enum pipe pipe;

        spin_lock_irq(&dev_priv->irq_lock);

        if (!intel_irqs_enabled(dev_priv)) {
                spin_unlock_irq(&dev_priv->irq_lock);
                return;
        }

        for_each_pipe_masked(dev_priv, pipe, pipe_mask)
                GEN8_IRQ_INIT_NDX(uncore, DE_PIPE, pipe,
                                  dev_priv->de_irq_mask[pipe],
                                  ~dev_priv->de_irq_mask[pipe] | extra_ier);

        spin_unlock_irq(&dev_priv->irq_lock);
}

void gen8_irq_power_well_pre_disable(struct drm_i915_private *dev_priv,
                                     u8 pipe_mask)
{
        struct intel_uncore *uncore = &dev_priv->uncore;
        enum pipe pipe;

        spin_lock_irq(&dev_priv->irq_lock);

        if (!intel_irqs_enabled(dev_priv)) {
                spin_unlock_irq(&dev_priv->irq_lock);
                return;
        }

        for_each_pipe_masked(dev_priv, pipe, pipe_mask)
                GEN8_IRQ_RESET_NDX(uncore, DE_PIPE, pipe);

        spin_unlock_irq(&dev_priv->irq_lock);

        /* make sure we're done processing display irqs */
        intel_synchronize_irq(dev_priv);
}

static void cherryview_irq_reset(struct drm_i915_private *dev_priv)
{
        struct intel_uncore *uncore = &dev_priv->uncore;

        I915_WRITE(GEN8_MASTER_IRQ, 0);
        POSTING_READ(GEN8_MASTER_IRQ);

        gen8_gt_irq_reset(&dev_priv->gt);

        GEN3_IRQ_RESET(uncore, GEN8_PCU_);

        spin_lock_irq(&dev_priv->irq_lock);
        if (dev_priv->display_irqs_enabled)
                vlv_display_irq_reset(dev_priv);
        spin_unlock_irq(&dev_priv->irq_lock);
}

static u32 intel_hpd_enabled_irqs(struct drm_i915_private *dev_priv,
                                  const u32 hpd[HPD_NUM_PINS])
{
        struct intel_encoder *encoder;
        u32 enabled_irqs = 0;

        for_each_intel_encoder(&dev_priv->drm, encoder)
                if (dev_priv->hotplug.stats[encoder->hpd_pin].state == HPD_ENABLED)
                        enabled_irqs |= hpd[encoder->hpd_pin];

        return enabled_irqs;
}

static void ibx_hpd_detection_setup(struct drm_i915_private *dev_priv)
{
        u32 hotplug;

        /*
         * Enable digital hotplug on the PCH, and configure the DP short pulse
         * duration to 2ms (which is the minimum in the Display Port spec).
         * The pulse duration bits are reserved on LPT+.
         */
        hotplug = I915_READ(PCH_PORT_HOTPLUG);
        hotplug &= ~(PORTB_PULSE_DURATION_MASK |
                     PORTC_PULSE_DURATION_MASK |
                     PORTD_PULSE_DURATION_MASK);
        hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;
        hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;
        hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms;
        /*
         * When CPU and PCH are on the same package, port A
         * HPD must be enabled in both north and south.
         */
        if (HAS_PCH_LPT_LP(dev_priv))
                hotplug |= PORTA_HOTPLUG_ENABLE;
        I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
}

static void ibx_hpd_irq_setup(struct drm_i915_private *dev_priv)
{
        u32 hotplug_irqs, enabled_irqs;

        if (HAS_PCH_IBX(dev_priv)) {
                hotplug_irqs = SDE_HOTPLUG_MASK;
                enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_ibx);
        } else {
                hotplug_irqs = SDE_HOTPLUG_MASK_CPT;
                enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_cpt);
        }

        ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);