// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright © 2006-2007 Intel Corporation
 *
 * Authors:
 *      Eric Anholt <eric@anholt.net>
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/pm_runtime.h>

#include <drm/drm_crtc.h>
#include <drm/drm_fourcc.h>

#include "framebuffer.h"
#include "gma_display.h"
#include "mdfld_dsi_output.h"
#include "mdfld_output.h"
#include "psb_intel_reg.h"

/* Hardcoded currently */
static int ksel = KSEL_CRYSTAL_19;

struct psb_intel_range_t {
        int min, max;
};

struct mrst_limit_t {
        struct psb_intel_range_t dot, m, p1;
};

struct mrst_clock_t {
        /* derived values */
        int dot;
        int m;
        int p1;
};

#define COUNT_MAX 0x10000000

void mdfldWaitForPipeDisable(struct drm_device *dev, int pipe)
{
        struct drm_psb_private *dev_priv = dev->dev_private;
        const struct psb_offset *map = &dev_priv->regmap[pipe];
        int count, temp;

        switch (pipe) {
        case 0:
        case 1:
        case 2:
                break;
        default:
                DRM_ERROR("Illegal Pipe Number.\n");
                return;
        }

        /* FIXME JLIU7_PO */
        gma_wait_for_vblank(dev);
        return;

        /* Wait for for the pipe disable to take effect. */
        for (count = 0; count < COUNT_MAX; count++) {
                temp = REG_READ(map->conf);
                if ((temp & PIPEACONF_PIPE_STATE) == 0)
                        break;
        }
}

void mdfldWaitForPipeEnable(struct drm_device *dev, int pipe)
{
        struct drm_psb_private *dev_priv = dev->dev_private;
        const struct psb_offset *map = &dev_priv->regmap[pipe];
        int count, temp;

        switch (pipe) {
        case 0:
        case 1:
        case 2:
                break;
        default:
                DRM_ERROR("Illegal Pipe Number.\n");
                return;
        }

        /* FIXME JLIU7_PO */
        gma_wait_for_vblank(dev);
        return;

        /* Wait for for the pipe enable to take effect. */
        for (count = 0; count < COUNT_MAX; count++) {
                temp = REG_READ(map->conf);
                if (temp & PIPEACONF_PIPE_STATE)
                        break;
        }
}

/**
 * Return the pipe currently connected to the panel fitter,
 * or -1 if the panel fitter is not present or not in use
 */
static int psb_intel_panel_fitter_pipe(struct drm_device *dev)
{
        u32 pfit_control;

        pfit_control = REG_READ(PFIT_CONTROL);

        /* See if the panel fitter is in use */
        if ((pfit_control & PFIT_ENABLE) == 0)
                return -1;

        /* 965 can place panel fitter on either pipe */
        return (pfit_control >> 29) & 0x3;
}

static int check_fb(struct drm_framebuffer *fb)
{
        if (!fb)
                return 0;

        switch (fb->format->cpp[0] * 8) {
        case 8:
        case 16:
        case 24:
        case 32:
                return 0;
        default:
                DRM_ERROR("Unknown color depth\n");
                return -EINVAL;
        }
}

static int mdfld__intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
                                struct drm_framebuffer *old_fb)
{
        struct drm_device *dev = crtc->dev;
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct drm_framebuffer *fb = crtc->primary->fb;
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        int pipe = gma_crtc->pipe;
        const struct psb_offset *map = &dev_priv->regmap[pipe];
        unsigned long start, offset;
        u32 dspcntr;
        int ret;

        dev_dbg(dev->dev, "pipe = 0x%x.\n", pipe);

        /* no fb bound */
        if (!fb) {
                dev_dbg(dev->dev, "No FB bound\n");
                return 0;
        }

        ret = check_fb(fb);
        if (ret)
                return ret;

        if (pipe > 2) {
                DRM_ERROR("Illegal Pipe Number.\n");
                return -EINVAL;
        }

        if (!gma_power_begin(dev, true))
                return 0;

        start = to_gtt_range(fb->obj[0])->offset;
        offset = y * fb->pitches[0] + x * fb->format->cpp[0];

        REG_WRITE(map->stride, fb->pitches[0]);
        dspcntr = REG_READ(map->cntr);
        dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;

        switch (fb->format->cpp[0] * 8) {
        case 8:
                dspcntr |= DISPPLANE_8BPP;
                break;
        case 16:
                if (fb->format->depth == 15)
                        dspcntr |= DISPPLANE_15_16BPP;
                else
                        dspcntr |= DISPPLANE_16BPP;
                break;
        case 24:
        case 32:
                dspcntr |= DISPPLANE_32BPP_NO_ALPHA;
                break;
        }
        REG_WRITE(map->cntr, dspcntr);

        dev_dbg(dev->dev, "Writing base %08lX %08lX %d %d\n",
                                                start, offset, x, y);
        REG_WRITE(map->linoff, offset);
        REG_READ(map->linoff);
        REG_WRITE(map->surf, start);
        REG_READ(map->surf);

        gma_power_end(dev);

        return 0;
}

/*
 * Disable the pipe, plane and pll.
 *
 */
void mdfld_disable_crtc(struct drm_device *dev, int pipe)
{
        struct drm_psb_private *dev_priv = dev->dev_private;
        const struct psb_offset *map = &dev_priv->regmap[pipe];
        u32 temp;

        dev_dbg(dev->dev, "pipe = %d\n", pipe);


        if (pipe != 1)
                mdfld_dsi_gen_fifo_ready(dev, MIPI_GEN_FIFO_STAT_REG(pipe),
                                HS_CTRL_FIFO_EMPTY | HS_DATA_FIFO_EMPTY);

        /* Disable display plane */
        temp = REG_READ(map->cntr);
        if ((temp & DISPLAY_PLANE_ENABLE) != 0) {
                REG_WRITE(map->cntr,
                          temp & ~DISPLAY_PLANE_ENABLE);
                /* Flush the plane changes */
                REG_WRITE(map->base, REG_READ(map->base));
                REG_READ(map->base);
        }

        /* FIXME_JLIU7 MDFLD_PO revisit */

        /* Next, disable display pipes */
        temp = REG_READ(map->conf);
        if ((temp & PIPEACONF_ENABLE) != 0) {
                temp &= ~PIPEACONF_ENABLE;
                temp |= PIPECONF_PLANE_OFF | PIPECONF_CURSOR_OFF;
                REG_WRITE(map->conf, temp);
                REG_READ(map->conf);

                /* Wait for for the pipe disable to take effect. */
                mdfldWaitForPipeDisable(dev, pipe);
        }

        temp = REG_READ(map->dpll);
        if (temp & DPLL_VCO_ENABLE) {
                if ((pipe != 1 &&
                        !((REG_READ(PIPEACONF) | REG_READ(PIPECCONF))
                                & PIPEACONF_ENABLE)) || pipe == 1) {
                        temp &= ~(DPLL_VCO_ENABLE);
                        REG_WRITE(map->dpll, temp);
                        REG_READ(map->dpll);
                        /* Wait for the clocks to turn off. */
                        /* FIXME_MDFLD PO may need more delay */
                        udelay(500);

                        if (!(temp & MDFLD_PWR_GATE_EN)) {
                                /* gating power of DPLL */
                                REG_WRITE(map->dpll, temp | MDFLD_PWR_GATE_EN);
                                /* FIXME_MDFLD PO - change 500 to 1 after PO */
                                udelay(5000);
                        }
                }
        }

}

/**
 * Sets the power management mode of the pipe and plane.
 *
 * This code should probably grow support for turning the cursor off and back
 * on appropriately at the same time as we're turning the pipe off/on.
 */
static void mdfld_crtc_dpms(struct drm_crtc *crtc, int mode)
{
        struct drm_device *dev = crtc->dev;
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        int pipe = gma_crtc->pipe;
        const struct psb_offset *map = &dev_priv->regmap[pipe];
        u32 pipeconf = dev_priv->pipeconf[pipe];
        u32 temp;
        int timeout = 0;

        dev_dbg(dev->dev, "mode = %d, pipe = %d\n", mode, pipe);

        /* Note: Old code uses pipe a stat for pipe b but that appears
           to be a bug */

        if (!gma_power_begin(dev, true))
                return;

        /* XXX: When our outputs are all unaware of DPMS modes other than off
         * and on, we should map those modes to DRM_MODE_DPMS_OFF in the CRTC.
         */
        switch (mode) {
        case DRM_MODE_DPMS_ON:
        case DRM_MODE_DPMS_STANDBY:
        case DRM_MODE_DPMS_SUSPEND:
                /* Enable the DPLL */
                temp = REG_READ(map->dpll);

                if ((temp & DPLL_VCO_ENABLE) == 0) {
                        /* When ungating power of DPLL, needs to wait 0.5us
                           before enable the VCO */
                        if (temp & MDFLD_PWR_GATE_EN) {
                                temp &= ~MDFLD_PWR_GATE_EN;
                                REG_WRITE(map->dpll, temp);
                                /* FIXME_MDFLD PO - change 500 to 1 after PO */
                                udelay(500);
                        }

                        REG_WRITE(map->dpll, temp);
                        REG_READ(map->dpll);
                        /* FIXME_MDFLD PO - change 500 to 1 after PO */
                        udelay(500);

                        REG_WRITE(map->dpll, temp | DPLL_VCO_ENABLE);
                        REG_READ(map->dpll);

                        /**
                         * wait for DSI PLL to lock
                         * NOTE: only need to poll status of pipe 0 and pipe 1,
                         * since both MIPI pipes share the same PLL.
                         */
                        while ((pipe != 2) && (timeout < 20000) &&
                          !(REG_READ(map->conf) & PIPECONF_DSIPLL_LOCK)) {
                                udelay(150);
                                timeout++;
                        }
                }

                /* Enable the plane */
                temp = REG_READ(map->cntr);
                if ((temp & DISPLAY_PLANE_ENABLE) == 0) {
                        REG_WRITE(map->cntr,
                                temp | DISPLAY_PLANE_ENABLE);
                        /* Flush the plane changes */
                        REG_WRITE(map->base, REG_READ(map->base));
                }

                /* Enable the pipe */
                temp = REG_READ(map->conf);
                if ((temp & PIPEACONF_ENABLE) == 0) {
                        REG_WRITE(map->conf, pipeconf);

                        /* Wait for for the pipe enable to take effect. */
                        mdfldWaitForPipeEnable(dev, pipe);
                }

                /*workaround for sighting 3741701 Random X blank display*/
                /*perform w/a in video mode only on pipe A or C*/
                if (pipe == 0 || pipe == 2) {
                        REG_WRITE(map->status, REG_READ(map->status));
                        msleep(100);
                        if (PIPE_VBLANK_STATUS & REG_READ(map->status))
                                dev_dbg(dev->dev, "OK");
                        else {
                                dev_dbg(dev->dev, "STUCK!!!!");
                                /*shutdown controller*/
                                temp = REG_READ(map->cntr);
                                REG_WRITE(map->cntr,
                                                temp & ~DISPLAY_PLANE_ENABLE);
                                REG_WRITE(map->base, REG_READ(map->base));
                                /*mdfld_dsi_dpi_shut_down(dev, pipe);*/
                                REG_WRITE(0xb048, 1);
                                msleep(100);
                                temp = REG_READ(map->conf);
                                temp &= ~PIPEACONF_ENABLE;
                                REG_WRITE(map->conf, temp);
                                msleep(100); /*wait for pipe disable*/
                                REG_WRITE(MIPI_DEVICE_READY_REG(pipe), 0);
                                msleep(100);
                                REG_WRITE(0xb004, REG_READ(0xb004));
                                /* try to bring the controller back up again*/
                                REG_WRITE(MIPI_DEVICE_READY_REG(pipe), 1);
                                temp = REG_READ(map->cntr);
                                REG_WRITE(map->cntr,
                                                temp | DISPLAY_PLANE_ENABLE);
                                REG_WRITE(map->base, REG_READ(map->base));
                                /*mdfld_dsi_dpi_turn_on(dev, pipe);*/
                                REG_WRITE(0xb048, 2);
                                msleep(100);
                                temp = REG_READ(map->conf);
                                temp |= PIPEACONF_ENABLE;
                                REG_WRITE(map->conf, temp);
                        }
                }

                gma_crtc_load_lut(crtc);

                /* Give the overlay scaler a chance to enable
                   if it's on this pipe */
                /* psb_intel_crtc_dpms_video(crtc, true); TODO */

                break;
        case DRM_MODE_DPMS_OFF:
                /* Give the overlay scaler a chance to disable
                 * if it's on this pipe */
                /* psb_intel_crtc_dpms_video(crtc, FALSE); TODO */
                if (pipe != 1)
                        mdfld_dsi_gen_fifo_ready(dev,
                                MIPI_GEN_FIFO_STAT_REG(pipe),
                                HS_CTRL_FIFO_EMPTY | HS_DATA_FIFO_EMPTY);

                /* Disable the VGA plane that we never use */
                REG_WRITE(VGACNTRL, VGA_DISP_DISABLE);

                /* Disable display plane */
                temp = REG_READ(map->cntr);
                if ((temp & DISPLAY_PLANE_ENABLE) != 0) {
                        REG_WRITE(map->cntr,
                                  temp & ~DISPLAY_PLANE_ENABLE);
                        /* Flush the plane changes */
                        REG_WRITE(map->base, REG_READ(map->base));
                        REG_READ(map->base);
                }

                /* Next, disable display pipes */
                temp = REG_READ(map->conf);
                if ((temp & PIPEACONF_ENABLE) != 0) {
                        temp &= ~PIPEACONF_ENABLE;
                        temp |= PIPECONF_PLANE_OFF | PIPECONF_CURSOR_OFF;
                        REG_WRITE(map->conf, temp);
                        REG_READ(map->conf);

                        /* Wait for for the pipe disable to take effect. */
                        mdfldWaitForPipeDisable(dev, pipe);
                }

                temp = REG_READ(map->dpll);
                if (temp & DPLL_VCO_ENABLE) {
                        if ((pipe != 1 && !((REG_READ(PIPEACONF)
                                | REG_READ(PIPECCONF)) & PIPEACONF_ENABLE))
                                        || pipe == 1) {
                                temp &= ~(DPLL_VCO_ENABLE);
                                REG_WRITE(map->dpll, temp);
                                REG_READ(map->dpll);
                                /* Wait for the clocks to turn off. */
                                /* FIXME_MDFLD PO may need more delay */
                                udelay(500);
                        }
                }
                break;
        }
        gma_power_end(dev);
}


#define MDFLD_LIMT_DPLL_19          0
#define MDFLD_LIMT_DPLL_25          1
#define MDFLD_LIMT_DPLL_83          2
#define MDFLD_LIMT_DPLL_100         3
#define MDFLD_LIMT_DSIPLL_19        4
#define MDFLD_LIMT_DSIPLL_25        5
#define MDFLD_LIMT_DSIPLL_83        6
#define MDFLD_LIMT_DSIPLL_100       7

#define MDFLD_DOT_MIN             19750
#define MDFLD_DOT_MAX             120000
#define MDFLD_DPLL_M_MIN_19         113
#define MDFLD_DPLL_M_MAX_19         155
#define MDFLD_DPLL_P1_MIN_19        2
#define MDFLD_DPLL_P1_MAX_19        10
#define MDFLD_DPLL_M_MIN_25         101
#define MDFLD_DPLL_M_MAX_25         130
#define MDFLD_DPLL_P1_MIN_25        2
#define MDFLD_DPLL_P1_MAX_25        10
#define MDFLD_DPLL_M_MIN_83         64
#define MDFLD_DPLL_M_MAX_83         64
#define MDFLD_DPLL_P1_MIN_83        2
#define MDFLD_DPLL_P1_MAX_83        2
#define MDFLD_DPLL_M_MIN_100        64
#define MDFLD_DPLL_M_MAX_100        64
#define MDFLD_DPLL_P1_MIN_100       2
#define MDFLD_DPLL_P1_MAX_100       2
#define MDFLD_DSIPLL_M_MIN_19       131
#define MDFLD_DSIPLL_M_MAX_19       175
#define MDFLD_DSIPLL_P1_MIN_19      3
#define MDFLD_DSIPLL_P1_MAX_19      8
#define MDFLD_DSIPLL_M_MIN_25       97
#define MDFLD_DSIPLL_M_MAX_25       140
#define MDFLD_DSIPLL_P1_MIN_25      3
#define MDFLD_DSIPLL_P1_MAX_25      9
#define MDFLD_DSIPLL_M_MIN_83       33
#define MDFLD_DSIPLL_M_MAX_83       92
#define MDFLD_DSIPLL_P1_MIN_83      2
#define MDFLD_DSIPLL_P1_MAX_83      3
#define MDFLD_DSIPLL_M_MIN_100      97
#define MDFLD_DSIPLL_M_MAX_100      140
#define MDFLD_DSIPLL_P1_MIN_100     3
#define MDFLD_DSIPLL_P1_MAX_100     9

static const struct mrst_limit_t mdfld_limits[] = {
        {                       /* MDFLD_LIMT_DPLL_19 */
         .dot = {.min = MDFLD_DOT_MIN, .max = MDFLD_DOT_MAX},
         .m = {.min = MDFLD_DPLL_M_MIN_19, .max = MDFLD_DPLL_M_MAX_19},
         .p1 = {.min = MDFLD_DPLL_P1_MIN_19, .max = MDFLD_DPLL_P1_MAX_19},
         },
        {                       /* MDFLD_LIMT_DPLL_25 */
         .dot = {.min = MDFLD_DOT_MIN, .max = MDFLD_DOT_MAX},
         .m = {.min = MDFLD_DPLL_M_MIN_25, .max = MDFLD_DPLL_M_MAX_25},
         .p1 = {.min = MDFLD_DPLL_P1_MIN_25, .max = MDFLD_DPLL_P1_MAX_25},
         },
        {                       /* MDFLD_LIMT_DPLL_83 */
         .dot = {.min = MDFLD_DOT_MIN, .max = MDFLD_DOT_MAX},
         .m = {.min = MDFLD_DPLL_M_MIN_83, .max = MDFLD_DPLL_M_MAX_83},
         .p1 = {.min = MDFLD_DPLL_P1_MIN_83, .max = MDFLD_DPLL_P1_MAX_83},
         },
        {                       /* MDFLD_LIMT_DPLL_100 */
         .dot = {.min = MDFLD_DOT_MIN, .max = MDFLD_DOT_MAX},
         .m = {.min = MDFLD_DPLL_M_MIN_100, .max = MDFLD_DPLL_M_MAX_100},
         .p1 = {.min = MDFLD_DPLL_P1_MIN_100, .max = MDFLD_DPLL_P1_MAX_100},
         },
        {                       /* MDFLD_LIMT_DSIPLL_19 */
         .dot = {.min = MDFLD_DOT_MIN, .max = MDFLD_DOT_MAX},
         .m = {.min = MDFLD_DSIPLL_M_MIN_19, .max = MDFLD_DSIPLL_M_MAX_19},
         .p1 = {.min = MDFLD_DSIPLL_P1_MIN_19, .max = MDFLD_DSIPLL_P1_MAX_19},
         },
        {                       /* MDFLD_LIMT_DSIPLL_25 */
         .dot = {.min = MDFLD_DOT_MIN, .max = MDFLD_DOT_MAX},
         .m = {.min = MDFLD_DSIPLL_M_MIN_25, .max = MDFLD_DSIPLL_M_MAX_25},
         .p1 = {.min = MDFLD_DSIPLL_P1_MIN_25, .max = MDFLD_DSIPLL_P1_MAX_25},
         },
        {                       /* MDFLD_LIMT_DSIPLL_83 */
         .dot = {.min = MDFLD_DOT_MIN, .max = MDFLD_DOT_MAX},
         .m = {.min = MDFLD_DSIPLL_M_MIN_83, .max = MDFLD_DSIPLL_M_MAX_83},
         .p1 = {.min = MDFLD_DSIPLL_P1_MIN_83, .max = MDFLD_DSIPLL_P1_MAX_83},
         },
        {                       /* MDFLD_LIMT_DSIPLL_100 */
         .dot = {.min = MDFLD_DOT_MIN, .max = MDFLD_DOT_MAX},
         .m = {.min = MDFLD_DSIPLL_M_MIN_100, .max = MDFLD_DSIPLL_M_MAX_100},
         .p1 = {.min = MDFLD_DSIPLL_P1_MIN_100, .max = MDFLD_DSIPLL_P1_MAX_100},
         },
};

#define MDFLD_M_MIN         21
#define MDFLD_M_MAX         180
static const u32 mdfld_m_converts[] = {
/* M configuration table from 9-bit LFSR table */
        224, 368, 440, 220, 366, 439, 219, 365, 182, 347, /* 21 - 30 */
        173, 342, 171, 85, 298, 149, 74, 37, 18, 265,   /* 31 - 40 */
        388, 194, 353, 432, 216, 108, 310, 155, 333, 166, /* 41 - 50 */
        83, 41, 276, 138, 325, 162, 337, 168, 340, 170, /* 51 - 60 */
        341, 426, 469, 234, 373, 442, 221, 110, 311, 411, /* 61 - 70 */
        461, 486, 243, 377, 188, 350, 175, 343, 427, 213, /* 71 - 80 */
        106, 53, 282, 397, 354, 227, 113, 56, 284, 142, /* 81 - 90 */
        71, 35, 273, 136, 324, 418, 465, 488, 500, 506, /* 91 - 100 */
        253, 126, 63, 287, 399, 455, 483, 241, 376, 444, /* 101 - 110 */
        478, 495, 503, 251, 381, 446, 479, 239, 375, 443, /* 111 - 120 */
        477, 238, 119, 315, 157, 78, 295, 147, 329, 420, /* 121 - 130 */
        210, 105, 308, 154, 77, 38, 275, 137, 68, 290, /* 131 - 140 */
        145, 328, 164, 82, 297, 404, 458, 485, 498, 249, /* 141 - 150 */
        380, 190, 351, 431, 471, 235, 117, 314, 413, 206, /* 151 - 160 */
        103, 51, 25, 12, 262, 387, 193, 96, 48, 280, /* 161 - 170 */
        396, 198, 99, 305, 152, 76, 294, 403, 457, 228, /* 171 - 180 */
};

static const struct mrst_limit_t *mdfld_limit(struct drm_crtc *crtc)
{
        const struct mrst_limit_t *limit = NULL;
        struct drm_device *dev = crtc->dev;
        struct drm_psb_private *dev_priv = dev->dev_private;

        if (gma_pipe_has_type(crtc, INTEL_OUTPUT_MIPI)
            || gma_pipe_has_type(crtc, INTEL_OUTPUT_MIPI2)) {
                if ((ksel == KSEL_CRYSTAL_19) || (ksel == KSEL_BYPASS_19))
                        limit = &mdfld_limits[MDFLD_LIMT_DSIPLL_19];
                else if (ksel == KSEL_BYPASS_25)
                        limit = &mdfld_limits[MDFLD_LIMT_DSIPLL_25];
                else if ((ksel == KSEL_BYPASS_83_100) &&
                                (dev_priv->core_freq == 166))
                        limit = &mdfld_limits[MDFLD_LIMT_DSIPLL_83];
                else if ((ksel == KSEL_BYPASS_83_100) &&
                         (dev_priv->core_freq == 100 ||
                                dev_priv->core_freq == 200))
                        limit = &mdfld_limits[MDFLD_LIMT_DSIPLL_100];
        } else if (gma_pipe_has_type(crtc, INTEL_OUTPUT_HDMI)) {
                if ((ksel == KSEL_CRYSTAL_19) || (ksel == KSEL_BYPASS_19))
                        limit = &mdfld_limits[MDFLD_LIMT_DPLL_19];
                else if (ksel == KSEL_BYPASS_25)
                        limit = &mdfld_limits[MDFLD_LIMT_DPLL_25];
                else if ((ksel == KSEL_BYPASS_83_100) &&
                                (dev_priv->core_freq == 166))
                        limit = &mdfld_limits[MDFLD_LIMT_DPLL_83];
                else if ((ksel == KSEL_BYPASS_83_100) &&
                                 (dev_priv->core_freq == 100 ||
                                 dev_priv->core_freq == 200))
                        limit = &mdfld_limits[MDFLD_LIMT_DPLL_100];
        } else {
                limit = NULL;
                dev_dbg(dev->dev, "mdfld_limit Wrong display type.\n");
        }

        return limit;
}

/** Derive the pixel clock for the given refclk and divisors for 8xx chips. */
static void mdfld_clock(int refclk, struct mrst_clock_t *clock)
{
        clock->dot = (refclk * clock->m) / clock->p1;
}

/**
 * Returns a set of divisors for the desired target clock with the given refclk,
 * or FALSE.  Divisor values are the actual divisors for
 */
static bool
mdfldFindBestPLL(struct drm_crtc *crtc, int target, int refclk,
                struct mrst_clock_t *best_clock)
{
        struct mrst_clock_t clock;
        const struct mrst_limit_t *limit = mdfld_limit(crtc);
        int err = target;

        memset(best_clock, 0, sizeof(*best_clock));

        for (clock.m = limit->m.min; clock.m <= limit->m.max; clock.m++) {
                for (clock.p1 = limit->p1.min; clock.p1 <= limit->p1.max;
                     clock.p1++) {
                        int this_err;

                        mdfld_clock(refclk, &clock);

                        this_err = abs(clock.dot - target);
                        if (this_err < err) {
                                *best_clock = clock;
                                err = this_err;
                        }
                }
        }
        return err != target;
}

static int mdfld_crtc_mode_set(struct drm_crtc *crtc,
                              struct drm_display_mode *mode,
                              struct drm_display_mode *adjusted_mode,
                              int x, int y,
                              struct drm_framebuffer *old_fb)
{
        struct drm_device *dev = crtc->dev;
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        struct drm_psb_private *dev_priv = dev->dev_private;
        int pipe = gma_crtc->pipe;
        const struct psb_offset *map = &dev_priv->regmap[pipe];
        int refclk = 0;
        int clk_n = 0, clk_p2 = 0, clk_byte = 1, clk = 0, m_conv = 0,
                                                                clk_tmp = 0;
        struct mrst_clock_t clock;
        bool ok;
        u32 dpll = 0, fp = 0;
        bool is_mipi = false, is_mipi2 = false, is_hdmi = false;
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct gma_encoder *gma_encoder = NULL;
        uint64_t scalingType = DRM_MODE_SCALE_FULLSCREEN;
        struct drm_encoder *encoder;
        struct drm_connector *connector;
        int timeout = 0;
        int ret;

        dev_dbg(dev->dev, "pipe = 0x%x\n", pipe);

        ret = check_fb(crtc->primary->fb);
        if (ret)
                return ret;

        dev_dbg(dev->dev, "adjusted_hdisplay = %d\n",
                 adjusted_mode->hdisplay);
        dev_dbg(dev->dev, "adjusted_vdisplay = %d\n",
                 adjusted_mode->vdisplay);
        dev_dbg(dev->dev, "adjusted_hsync_start = %d\n",
                 adjusted_mode->hsync_start);
        dev_dbg(dev->dev, "adjusted_hsync_end = %d\n",
                 adjusted_mode->hsync_end);
        dev_dbg(dev->dev, "adjusted_htotal = %d\n",
                 adjusted_mode->htotal);
        dev_dbg(dev->dev, "adjusted_vsync_start = %d\n",
                 adjusted_mode->vsync_start);
        dev_dbg(dev->dev, "adjusted_vsync_end = %d\n",
                 adjusted_mode->vsync_end);
        dev_dbg(dev->dev, "adjusted_vtotal = %d\n",
                 adjusted_mode->vtotal);
        dev_dbg(dev->dev, "adjusted_clock = %d\n",
                 adjusted_mode->clock);
        dev_dbg(dev->dev, "hdisplay = %d\n",
                 mode->hdisplay);
        dev_dbg(dev->dev, "vdisplay = %d\n",
                 mode->vdisplay);

        if (!gma_power_begin(dev, true))
                return 0;

        memcpy(&gma_crtc->saved_mode, mode,
                                        sizeof(struct drm_display_mode));
        memcpy(&gma_crtc->saved_adjusted_mode, adjusted_mode,
                                        sizeof(struct drm_display_mode));

        list_for_each_entry(connector, &mode_config->connector_list, head) {
                encoder = connector->encoder;
                if (!encoder)
                        continue;

                if (encoder->crtc != crtc)
                        continue;

                gma_encoder = gma_attached_encoder(connector);

                switch (gma_encoder->type) {
                case INTEL_OUTPUT_MIPI:
                        is_mipi = true;
                        break;
                case INTEL_OUTPUT_MIPI2:
                        is_mipi2 = true;
                        break;
                case INTEL_OUTPUT_HDMI:
                        is_hdmi = true;
                        break;
                }
        }

        /* Disable the VGA plane that we never use */
        REG_WRITE(VGACNTRL, VGA_DISP_DISABLE);

        /* Disable the panel fitter if it was on our pipe */
        if (psb_intel_panel_fitter_pipe(dev) == pipe)
                REG_WRITE(PFIT_CONTROL, 0);

        /* pipesrc and dspsize control the size that is scaled from,
         * which should always be the user's requested size.
         */
        if (pipe == 1) {
                /* FIXME: To make HDMI display with 864x480 (TPO), 480x864
                 * (PYR) or 480x854 (TMD), set the sprite width/height and
                 * souce image size registers with the adjusted mode for
                 * pipe B.
                 */

                /*
                 * The defined sprite rectangle must always be completely
                 * contained within the displayable area of the screen image
                 * (frame buffer).
                 */
                REG_WRITE(map->size, ((min(mode->crtc_vdisplay, adjusted_mode->crtc_vdisplay) - 1) << 16)
                                | (min(mode->crtc_hdisplay, adjusted_mode->crtc_hdisplay) - 1));
                /* Set the CRTC with encoder mode. */
                REG_WRITE(map->src, ((mode->crtc_hdisplay - 1) << 16)
                                 | (mode->crtc_vdisplay - 1));
        } else {
                REG_WRITE(map->size,
                                ((mode->crtc_vdisplay - 1) << 16) |
                                                (mode->crtc_hdisplay - 1));
                REG_WRITE(map->src,
                                ((mode->crtc_hdisplay - 1) << 16) |
                                                (mode->crtc_vdisplay - 1));
        }

        REG_WRITE(map->pos, 0);

        if (gma_encoder)
                drm_object_property_get_value(&connector->base,
                        dev->mode_config.scaling_mode_property, &scalingType);

        if (scalingType == DRM_MODE_SCALE_NO_SCALE) {
                /* Medfield doesn't have register support for centering so we
                 * need to mess with the h/vblank and h/vsync start and ends
                 * to get centering
                 */
                int offsetX = 0, offsetY = 0;

                offsetX = (adjusted_mode->crtc_hdisplay -
                                        mode->crtc_hdisplay) / 2;
                offsetY = (adjusted_mode->crtc_vdisplay -
                                        mode->crtc_vdisplay) / 2;

                REG_WRITE(map->htotal, (mode->crtc_hdisplay - 1) |
                        ((adjusted_mode->crtc_htotal - 1) << 16));
                REG_WRITE(map->vtotal, (mode->crtc_vdisplay - 1) |
                        ((adjusted_mode->crtc_vtotal - 1) << 16));
                REG_WRITE(map->hblank, (adjusted_mode->crtc_hblank_start -
                                                                offsetX - 1) |
                        ((adjusted_mode->crtc_hblank_end - offsetX - 1) << 16));
                REG_WRITE(map->hsync, (adjusted_mode->crtc_hsync_start -
                                                                offsetX - 1) |
                        ((adjusted_mode->crtc_hsync_end - offsetX - 1) << 16));
                REG_WRITE(map->vblank, (adjusted_mode->crtc_vblank_start -
                                                                offsetY - 1) |
                        ((adjusted_mode->crtc_vblank_end - offsetY - 1) << 16));
                REG_WRITE(map->vsync, (adjusted_mode->crtc_vsync_start -
                                                                offsetY - 1) |
                        ((adjusted_mode->crtc_vsync_end - offsetY - 1) << 16));
        } else {
                REG_WRITE(map->htotal, (adjusted_mode->crtc_hdisplay - 1) |
                        ((adjusted_mode->crtc_htotal - 1) << 16));
                REG_WRITE(map->vtotal, (adjusted_mode->crtc_vdisplay - 1) |
                        ((adjusted_mode->crtc_vtotal - 1) << 16));
                REG_WRITE(map->hblank, (adjusted_mode->crtc_hblank_start - 1) |
                        ((adjusted_mode->crtc_hblank_end - 1) << 16));
                REG_WRITE(map->hsync, (adjusted_mode->crtc_hsync_start - 1) |
                        ((adjusted_mode->crtc_hsync_end - 1) << 16));
                REG_WRITE(map->vblank, (adjusted_mode->crtc_vblank_start - 1) |
                        ((adjusted_mode->crtc_vblank_end - 1) << 16));
                REG_WRITE(map->vsync, (adjusted_mode->crtc_vsync_start - 1) |
                        ((adjusted_mode->crtc_vsync_end - 1) << 16));
        }

        /* Flush the plane changes */
        {
                const struct drm_crtc_helper_funcs *crtc_funcs =
                    crtc->helper_private;
                crtc_funcs->mode_set_base(crtc, x, y, old_fb);
        }

        /* setup pipeconf */
        dev_priv->pipeconf[pipe] = PIPEACONF_ENABLE; /* FIXME_JLIU7 REG_READ(pipeconf_reg); */

        /* Set up the display plane register */
        dev_priv->dspcntr[pipe] = REG_READ(map->cntr);
        dev_priv->dspcntr[pipe] |= pipe << DISPPLANE_SEL_PIPE_POS;
        dev_priv->dspcntr[pipe] |= DISPLAY_PLANE_ENABLE;

        if (is_mipi2)
                goto mrst_crtc_mode_set_exit;
        clk = adjusted_mode->clock;

        if (is_hdmi) {
                if ((ksel == KSEL_CRYSTAL_19) || (ksel == KSEL_BYPASS_19)) {
                        refclk = 19200;

                        if (is_mipi || is_mipi2)
                                clk_n = 1, clk_p2 = 8;
                        else if (is_hdmi)
                                clk_n = 1, clk_p2 = 10;
                } else if (ksel == KSEL_BYPASS_25) {
                        refclk = 25000;

                        if (is_mipi || is_mipi2)
                                clk_n = 1, clk_p2 = 8;
                        else if (is_hdmi)
                                clk_n = 1, clk_p2 = 10;
                } else if ((ksel == KSEL_BYPASS_83_100) &&
                                        dev_priv->core_freq == 166) {
                        refclk = 83000;

                        if (is_mipi || is_mipi2)
                                clk_n = 4, clk_p2 = 8;
                        else if (is_hdmi)
                                clk_n = 4, clk_p2 = 10;
                } else if ((ksel == KSEL_BYPASS_83_100) &&
                                        (dev_priv->core_freq == 100 ||
                                        dev_priv->core_freq == 200)) {
                        refclk = 100000;
                        if (is_mipi || is_mipi2)
                                clk_n = 4, clk_p2 = 8;
                        else if (is_hdmi)
                                clk_n = 4, clk_p2 = 10;
                }

                if (is_mipi)
                        clk_byte = dev_priv->bpp / 8;
                else if (is_mipi2)
                        clk_byte = dev_priv->bpp2 / 8;

                clk_tmp = clk * clk_n * clk_p2 * clk_byte;

                dev_dbg(dev->dev, "clk = %d, clk_n = %d, clk_p2 = %d.\n",
                                        clk, clk_n, clk_p2);
                dev_dbg(dev->dev, "adjusted_mode->clock = %d, clk_tmp = %d.\n",
                                        adjusted_mode->clock, clk_tmp);

                ok = mdfldFindBestPLL(crtc, clk_tmp, refclk, &clock);

                if (!ok) {
                        DRM_ERROR
                            ("mdfldFindBestPLL fail in mdfld_crtc_mode_set.\n");
                } else {
                        m_conv = mdfld_m_converts[(clock.m - MDFLD_M_MIN)];

                        dev_dbg(dev->dev, "dot clock = %d,"
                                 "m = %d, p1 = %d, m_conv = %d.\n",
                                        clock.dot, clock.m,
                                        clock.p1, m_conv);
                }

                dpll = REG_READ(map->dpll);

                if (dpll & DPLL_VCO_ENABLE) {
                        dpll &= ~DPLL_VCO_ENABLE;
                        REG_WRITE(map->dpll, dpll);
                        REG_READ(map->dpll);

                        /* FIXME jliu7 check the DPLL lock bit PIPEACONF[29] */
                        /* FIXME_MDFLD PO - change 500 to 1 after PO */
                        udelay(500);

                        /* reset M1, N1 & P1 */
                        REG_WRITE(map->fp0, 0);
                        dpll &= ~MDFLD_P1_MASK;
                        REG_WRITE(map->dpll, dpll);
                        /* FIXME_MDFLD PO - change 500 to 1 after PO */
                        udelay(500);
                }

                /* When ungating power of DPLL, needs to wait 0.5us before
                 * enable the VCO */
                if (dpll & MDFLD_PWR_GATE_EN) {
                        dpll &= ~MDFLD_PWR_GATE_EN;
                        REG_WRITE(map->dpll, dpll);
                        /* FIXME_MDFLD PO - change 500 to 1 after PO */
                        udelay(500);
                }
                dpll = 0;

                if (is_hdmi)
                        dpll |= MDFLD_VCO_SEL;

                fp = (clk_n / 2) << 16;
                fp |= m_conv;

                /* compute bitmask from p1 value */
                dpll |= (1 << (clock.p1 - 2)) << 17;

        } else {
                dpll = 0x00800000;
                fp = 0x000000c1;
        }

        REG_WRITE(map->fp0, fp);
        REG_WRITE(map->dpll, dpll);
        /* FIXME_MDFLD PO - change 500 to 1 after PO */
        udelay(500);

        dpll |= DPLL_VCO_ENABLE;
        REG_WRITE(map->dpll, dpll);
        REG_READ(map->dpll);

        /* wait for DSI PLL to lock */
        while (timeout < 20000 &&
                        !(REG_READ(map->conf) & PIPECONF_DSIPLL_LOCK)) {
                udelay(150);
                timeout++;
        }

        if (is_mipi)
                goto mrst_crtc_mode_set_exit;

        dev_dbg(dev->dev, "is_mipi = 0x%x\n", is_mipi);

        REG_WRITE(map->conf, dev_priv->pipeconf[pipe]);
        REG_READ(map->conf);

        /* Wait for for the pipe enable to take effect. */
        REG_WRITE(map->cntr, dev_priv->dspcntr[pipe]);
        gma_wait_for_vblank(dev);

mrst_crtc_mode_set_exit:

        gma_power_end(dev);

        return 0;
}

const struct drm_crtc_helper_funcs mdfld_helper_funcs = {
        .dpms = mdfld_crtc_dpms,
        .mode_set = mdfld_crtc_mode_set,
        .mode_set_base = mdfld__intel_pipe_set_base,
        .prepare = gma_crtc_prepare,
        .commit = gma_crtc_commit,
};