drm/exynos: modify goto labels to meaningful names

[mirror_ubuntu-artful-kernel.git] / drivers / gpu / drm / exynos / exynos_drm_fimd.c

/* exynos_drm_fimd.c
 *
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Authors:
 *      Joonyoung Shim <jy0922.shim@samsung.com>
 *      Inki Dae <inki.dae@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */
#include <drm/drmP.h>

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>

#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/samsung_fimd.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_fbdev.h"
#include "exynos_drm_crtc.h"
#include "exynos_drm_iommu.h"

/*
 * FIMD stands for Fully Interactive Mobile Display and
 * as a display controller, it transfers contents drawn on memory
 * to a LCD Panel through Display Interfaces such as RGB or
 * CPU Interface.
 */

#define FIMD_DEFAULT_FRAMERATE 60

/* position control register for hardware window 0, 2 ~ 4.*/
#define VIDOSD_A(win)           (VIDOSD_BASE + 0x00 + (win) * 16)
#define VIDOSD_B(win)           (VIDOSD_BASE + 0x04 + (win) * 16)
/*
 * size control register for hardware windows 0 and alpha control register
 * for hardware windows 1 ~ 4
 */
#define VIDOSD_C(win)           (VIDOSD_BASE + 0x08 + (win) * 16)
/* size control register for hardware windows 1 ~ 2. */
#define VIDOSD_D(win)           (VIDOSD_BASE + 0x0C + (win) * 16)

#define VIDWx_BUF_START(win, buf)       (VIDW_BUF_START(buf) + (win) * 8)
#define VIDWx_BUF_END(win, buf)         (VIDW_BUF_END(buf) + (win) * 8)
#define VIDWx_BUF_SIZE(win, buf)        (VIDW_BUF_SIZE(buf) + (win) * 4)

/* color key control register for hardware window 1 ~ 4. */
#define WKEYCON0_BASE(x)                ((WKEYCON0 + 0x140) + ((x - 1) * 8))
/* color key value register for hardware window 1 ~ 4. */
#define WKEYCON1_BASE(x)                ((WKEYCON1 + 0x140) + ((x - 1) * 8))

/* FIMD has totally five hardware windows. */
#define WINDOWS_NR      5

#define get_fimd_manager(mgr)   platform_get_drvdata(to_platform_device(dev))

struct fimd_driver_data {
        unsigned int timing_base;

        unsigned int has_shadowcon:1;
        unsigned int has_clksel:1;
        unsigned int has_limited_fmt:1;
};

static struct fimd_driver_data s3c64xx_fimd_driver_data = {
        .timing_base = 0x0,
        .has_clksel = 1,
        .has_limited_fmt = 1,
};

static struct fimd_driver_data exynos4_fimd_driver_data = {
        .timing_base = 0x0,
        .has_shadowcon = 1,
};

static struct fimd_driver_data exynos5_fimd_driver_data = {
        .timing_base = 0x20000,
        .has_shadowcon = 1,
};

struct fimd_win_data {
        unsigned int            offset_x;
        unsigned int            offset_y;
        unsigned int            ovl_width;
        unsigned int            ovl_height;
        unsigned int            fb_width;
        unsigned int            fb_height;
        unsigned int            bpp;
        unsigned int            pixel_format;
        dma_addr_t              dma_addr;
        unsigned int            buf_offsize;
        unsigned int            line_size;      /* bytes */
        bool                    enabled;
        bool                    resume;
};

struct fimd_context {
        struct device                   *dev;
        struct drm_device               *drm_dev;
        struct clk                      *bus_clk;
        struct clk                      *lcd_clk;
        void __iomem                    *regs;
        struct drm_display_mode         mode;
        struct fimd_win_data            win_data[WINDOWS_NR];
        unsigned int                    default_win;
        unsigned long                   irq_flags;
        u32                             vidcon1;
        bool                            suspended;
        int                             pipe;
        wait_queue_head_t               wait_vsync_queue;
        atomic_t                        wait_vsync_event;

        struct exynos_drm_panel_info panel;
        struct fimd_driver_data *driver_data;
};

static const struct of_device_id fimd_driver_dt_match[] = {
        { .compatible = "samsung,s3c6400-fimd",
          .data = &s3c64xx_fimd_driver_data },
        { .compatible = "samsung,exynos4210-fimd",
          .data = &exynos4_fimd_driver_data },
        { .compatible = "samsung,exynos5250-fimd",
          .data = &exynos5_fimd_driver_data },
        {},
};

static inline struct fimd_driver_data *drm_fimd_get_driver_data(
        struct platform_device *pdev)
{
        const struct of_device_id *of_id =
                        of_match_device(fimd_driver_dt_match, &pdev->dev);

        return (struct fimd_driver_data *)of_id->data;
}

static void fimd_wait_for_vblank(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;

        if (ctx->suspended)
                return;

        atomic_set(&ctx->wait_vsync_event, 1);

        /*
         * wait for FIMD to signal VSYNC interrupt or return after
         * timeout which is set to 50ms (refresh rate of 20).
         */
        if (!wait_event_timeout(ctx->wait_vsync_queue,
                                !atomic_read(&ctx->wait_vsync_event),
                                HZ/20))
                DRM_DEBUG_KMS("vblank wait timed out.\n");
}


static void fimd_clear_channel(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;
        int win, ch_enabled = 0;

        DRM_DEBUG_KMS("%s\n", __FILE__);

        /* Check if any channel is enabled. */
        for (win = 0; win < WINDOWS_NR; win++) {
                u32 val = readl(ctx->regs + SHADOWCON);
                if (val & SHADOWCON_CHx_ENABLE(win)) {
                        val &= ~SHADOWCON_CHx_ENABLE(win);
                        writel(val, ctx->regs + SHADOWCON);
                        ch_enabled = 1;
                }
        }

        /* Wait for vsync, as disable channel takes effect at next vsync */
        if (ch_enabled)
                fimd_wait_for_vblank(mgr);
}

static int fimd_mgr_initialize(struct exynos_drm_manager *mgr,
                        struct drm_device *drm_dev, int pipe)
{
        struct fimd_context *ctx = mgr->ctx;

        ctx->drm_dev = drm_dev;
        ctx->pipe = pipe;

        /*
         * enable drm irq mode.
         * - with irq_enabled = true, we can use the vblank feature.
         *
         * P.S. note that we wouldn't use drm irq handler but
         *      just specific driver own one instead because
         *      drm framework supports only one irq handler.
         */
        drm_dev->irq_enabled = true;

        /*
         * with vblank_disable_allowed = true, vblank interrupt will be disabled
         * by drm timer once a current process gives up ownership of
         * vblank event.(after drm_vblank_put function is called)
         */
        drm_dev->vblank_disable_allowed = true;

        /* attach this sub driver to iommu mapping if supported. */
        if (is_drm_iommu_supported(ctx->drm_dev)) {
                /*
                 * If any channel is already active, iommu will throw
                 * a PAGE FAULT when enabled. So clear any channel if enabled.
                 */
                fimd_clear_channel(mgr);
                drm_iommu_attach_device(ctx->drm_dev, ctx->dev);
        }

        return 0;
}

static void fimd_mgr_remove(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;

        /* detach this sub driver from iommu mapping if supported. */
        if (is_drm_iommu_supported(ctx->drm_dev))
                drm_iommu_detach_device(ctx->drm_dev, ctx->dev);
}

static u32 fimd_calc_clkdiv(struct fimd_context *ctx,
                const struct drm_display_mode *mode)
{
        unsigned long ideal_clk = mode->htotal * mode->vtotal * mode->vrefresh;
        u32 clkdiv;

        /* Find the clock divider value that gets us closest to ideal_clk */
        clkdiv = DIV_ROUND_UP(clk_get_rate(ctx->lcd_clk), ideal_clk);

        return (clkdiv < 0x100) ? clkdiv : 0xff;
}

static bool fimd_mode_fixup(struct exynos_drm_manager *mgr,
                const struct drm_display_mode *mode,
                struct drm_display_mode *adjusted_mode)
{
        if (adjusted_mode->vrefresh == 0)
                adjusted_mode->vrefresh = FIMD_DEFAULT_FRAMERATE;

        return true;
}

static void fimd_mode_set(struct exynos_drm_manager *mgr,
                const struct drm_display_mode *in_mode)
{
        struct fimd_context *ctx = mgr->ctx;

        drm_mode_copy(&ctx->mode, in_mode);
}

static void fimd_commit(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;
        struct drm_display_mode *mode = &ctx->mode;
        struct fimd_driver_data *driver_data;
        u32 val, clkdiv, vidcon1;
        int vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;

        driver_data = ctx->driver_data;
        if (ctx->suspended)
                return;

        /* nothing to do if we haven't set the mode yet */
        if (mode->htotal == 0 || mode->vtotal == 0)
                return;

        /* setup polarity values */
        vidcon1 = ctx->vidcon1;
        if (mode->flags & DRM_MODE_FLAG_NVSYNC)
                vidcon1 |= VIDCON1_INV_VSYNC;
        if (mode->flags & DRM_MODE_FLAG_NHSYNC)
                vidcon1 |= VIDCON1_INV_HSYNC;
        writel(vidcon1, ctx->regs + driver_data->timing_base + VIDCON1);

        /* setup vertical timing values. */
        vsync_len = mode->crtc_vsync_end - mode->crtc_vsync_start;
        vbpd = mode->crtc_vtotal - mode->crtc_vsync_end;
        vfpd = mode->crtc_vsync_start - mode->crtc_vdisplay;

        val = VIDTCON0_VBPD(vbpd - 1) |
                VIDTCON0_VFPD(vfpd - 1) |
                VIDTCON0_VSPW(vsync_len - 1);
        writel(val, ctx->regs + driver_data->timing_base + VIDTCON0);

        /* setup horizontal timing values.  */
        hsync_len = mode->crtc_hsync_end - mode->crtc_hsync_start;
        hbpd = mode->crtc_htotal - mode->crtc_hsync_end;
        hfpd = mode->crtc_hsync_start - mode->crtc_hdisplay;

        val = VIDTCON1_HBPD(hbpd - 1) |
                VIDTCON1_HFPD(hfpd - 1) |
                VIDTCON1_HSPW(hsync_len - 1);
        writel(val, ctx->regs + driver_data->timing_base + VIDTCON1);

        /* setup horizontal and vertical display size. */
        val = VIDTCON2_LINEVAL(mode->vdisplay - 1) |
               VIDTCON2_HOZVAL(mode->hdisplay - 1) |
               VIDTCON2_LINEVAL_E(mode->vdisplay - 1) |
               VIDTCON2_HOZVAL_E(mode->hdisplay - 1);
        writel(val, ctx->regs + driver_data->timing_base + VIDTCON2);

        /*
         * fields of register with prefix '_F' would be updated
         * at vsync(same as dma start)
         */
        val = VIDCON0_ENVID | VIDCON0_ENVID_F;

        if (ctx->driver_data->has_clksel)
                val |= VIDCON0_CLKSEL_LCD;

        clkdiv = fimd_calc_clkdiv(ctx, mode);
        if (clkdiv > 1)
                val |= VIDCON0_CLKVAL_F(clkdiv - 1) | VIDCON0_CLKDIR;

        writel(val, ctx->regs + VIDCON0);
}

static int fimd_enable_vblank(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;
        u32 val;

        if (ctx->suspended)
                return -EPERM;

        if (!test_and_set_bit(0, &ctx->irq_flags)) {
                val = readl(ctx->regs + VIDINTCON0);

                val |= VIDINTCON0_INT_ENABLE;
                val |= VIDINTCON0_INT_FRAME;

                val &= ~VIDINTCON0_FRAMESEL0_MASK;
                val |= VIDINTCON0_FRAMESEL0_VSYNC;
                val &= ~VIDINTCON0_FRAMESEL1_MASK;
                val |= VIDINTCON0_FRAMESEL1_NONE;

                writel(val, ctx->regs + VIDINTCON0);
        }

        return 0;
}

static void fimd_disable_vblank(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;
        u32 val;

        if (ctx->suspended)
                return;

        if (test_and_clear_bit(0, &ctx->irq_flags)) {
                val = readl(ctx->regs + VIDINTCON0);

                val &= ~VIDINTCON0_INT_FRAME;
                val &= ~VIDINTCON0_INT_ENABLE;

                writel(val, ctx->regs + VIDINTCON0);
        }
}

static void fimd_win_mode_set(struct exynos_drm_manager *mgr,
                        struct exynos_drm_overlay *overlay)
{
        struct fimd_context *ctx = mgr->ctx;
        struct fimd_win_data *win_data;
        int win;
        unsigned long offset;

        if (!overlay) {
                DRM_ERROR("overlay is NULL\n");
                return;
        }

        win = overlay->zpos;
        if (win == DEFAULT_ZPOS)
                win = ctx->default_win;

        if (win < 0 || win >= WINDOWS_NR)
                return;

        offset = overlay->fb_x * (overlay->bpp >> 3);
        offset += overlay->fb_y * overlay->pitch;

        DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch);

        win_data = &ctx->win_data[win];

        win_data->offset_x = overlay->crtc_x;
        win_data->offset_y = overlay->crtc_y;
        win_data->ovl_width = overlay->crtc_width;
        win_data->ovl_height = overlay->crtc_height;
        win_data->fb_width = overlay->fb_width;
        win_data->fb_height = overlay->fb_height;
        win_data->dma_addr = overlay->dma_addr[0] + offset;
        win_data->bpp = overlay->bpp;
        win_data->pixel_format = overlay->pixel_format;
        win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) *
                                (overlay->bpp >> 3);
        win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3);

        DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n",
                        win_data->offset_x, win_data->offset_y);
        DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n",
                        win_data->ovl_width, win_data->ovl_height);
        DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr);
        DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n",
                        overlay->fb_width, overlay->crtc_width);
}

static void fimd_win_set_pixfmt(struct fimd_context *ctx, unsigned int win)
{
        struct fimd_win_data *win_data = &ctx->win_data[win];
        unsigned long val;

        val = WINCONx_ENWIN;

        /*
         * In case of s3c64xx, window 0 doesn't support alpha channel.
         * So the request format is ARGB8888 then change it to XRGB8888.
         */
        if (ctx->driver_data->has_limited_fmt && !win) {
                if (win_data->pixel_format == DRM_FORMAT_ARGB8888)
                        win_data->pixel_format = DRM_FORMAT_XRGB8888;
        }

        switch (win_data->pixel_format) {
        case DRM_FORMAT_C8:
                val |= WINCON0_BPPMODE_8BPP_PALETTE;
                val |= WINCONx_BURSTLEN_8WORD;
                val |= WINCONx_BYTSWP;
                break;
        case DRM_FORMAT_XRGB1555:
                val |= WINCON0_BPPMODE_16BPP_1555;
                val |= WINCONx_HAWSWP;
                val |= WINCONx_BURSTLEN_16WORD;
                break;
        case DRM_FORMAT_RGB565:
                val |= WINCON0_BPPMODE_16BPP_565;
                val |= WINCONx_HAWSWP;
                val |= WINCONx_BURSTLEN_16WORD;
                break;
        case DRM_FORMAT_XRGB8888:
                val |= WINCON0_BPPMODE_24BPP_888;
                val |= WINCONx_WSWP;
                val |= WINCONx_BURSTLEN_16WORD;
                break;
        case DRM_FORMAT_ARGB8888:
                val |= WINCON1_BPPMODE_25BPP_A1888
                        | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
                val |= WINCONx_WSWP;
                val |= WINCONx_BURSTLEN_16WORD;
                break;
        default:
                DRM_DEBUG_KMS("invalid pixel size so using unpacked 24bpp.\n");

                val |= WINCON0_BPPMODE_24BPP_888;
                val |= WINCONx_WSWP;
                val |= WINCONx_BURSTLEN_16WORD;
                break;
        }

        DRM_DEBUG_KMS("bpp = %d\n", win_data->bpp);

        writel(val, ctx->regs + WINCON(win));
}

static void fimd_win_set_colkey(struct fimd_context *ctx, unsigned int win)
{
        unsigned int keycon0 = 0, keycon1 = 0;

        keycon0 = ~(WxKEYCON0_KEYBL_EN | WxKEYCON0_KEYEN_F |
                        WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);

        keycon1 = WxKEYCON1_COLVAL(0xffffffff);

        writel(keycon0, ctx->regs + WKEYCON0_BASE(win));
        writel(keycon1, ctx->regs + WKEYCON1_BASE(win));
}

/**
 * shadow_protect_win() - disable updating values from shadow registers at vsync
 *
 * @win: window to protect registers for
 * @protect: 1 to protect (disable updates)
 */
static void fimd_shadow_protect_win(struct fimd_context *ctx,
                                                        int win, bool protect)
{
        u32 reg, bits, val;

        if (ctx->driver_data->has_shadowcon) {
                reg = SHADOWCON;
                bits = SHADOWCON_WINx_PROTECT(win);
        } else {
                reg = PRTCON;
                bits = PRTCON_PROTECT;
        }

        val = readl(ctx->regs + reg);
        if (protect)
                val |= bits;
        else
                val &= ~bits;
        writel(val, ctx->regs + reg);
}

static void fimd_win_commit(struct exynos_drm_manager *mgr, int zpos)
{
        struct fimd_context *ctx = mgr->ctx;
        struct fimd_win_data *win_data;
        int win = zpos;
        unsigned long val, alpha, size;
        unsigned int last_x;
        unsigned int last_y;

        if (ctx->suspended)
                return;

        if (win == DEFAULT_ZPOS)
                win = ctx->default_win;

        if (win < 0 || win >= WINDOWS_NR)
                return;

        win_data = &ctx->win_data[win];

        /* If suspended, enable this on resume */
        if (ctx->suspended) {
                win_data->resume = true;
                return;
        }

        /*
         * SHADOWCON/PRTCON register is used for enabling timing.
         *
         * for example, once only width value of a register is set,
         * if the dma is started then fimd hardware could malfunction so
         * with protect window setting, the register fields with prefix '_F'
         * wouldn't be updated at vsync also but updated once unprotect window
         * is set.
         */

        /* protect windows */
        fimd_shadow_protect_win(ctx, win, true);

        /* buffer start address */
        val = (unsigned long)win_data->dma_addr;
        writel(val, ctx->regs + VIDWx_BUF_START(win, 0));

        /* buffer end address */
        size = win_data->fb_width * win_data->ovl_height * (win_data->bpp >> 3);
        val = (unsigned long)(win_data->dma_addr + size);
        writel(val, ctx->regs + VIDWx_BUF_END(win, 0));

        DRM_DEBUG_KMS("start addr = 0x%lx, end addr = 0x%lx, size = 0x%lx\n",
                        (unsigned long)win_data->dma_addr, val, size);
        DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n",
                        win_data->ovl_width, win_data->ovl_height);

        /* buffer size */
        val = VIDW_BUF_SIZE_OFFSET(win_data->buf_offsize) |
                VIDW_BUF_SIZE_PAGEWIDTH(win_data->line_size) |
                VIDW_BUF_SIZE_OFFSET_E(win_data->buf_offsize) |
                VIDW_BUF_SIZE_PAGEWIDTH_E(win_data->line_size);
        writel(val, ctx->regs + VIDWx_BUF_SIZE(win, 0));

        /* OSD position */
        val = VIDOSDxA_TOPLEFT_X(win_data->offset_x) |
                VIDOSDxA_TOPLEFT_Y(win_data->offset_y) |
                VIDOSDxA_TOPLEFT_X_E(win_data->offset_x) |
                VIDOSDxA_TOPLEFT_Y_E(win_data->offset_y);
        writel(val, ctx->regs + VIDOSD_A(win));

        last_x = win_data->offset_x + win_data->ovl_width;
        if (last_x)
                last_x--;
        last_y = win_data->offset_y + win_data->ovl_height;
        if (last_y)
                last_y--;

        val = VIDOSDxB_BOTRIGHT_X(last_x) | VIDOSDxB_BOTRIGHT_Y(last_y) |
                VIDOSDxB_BOTRIGHT_X_E(last_x) | VIDOSDxB_BOTRIGHT_Y_E(last_y);

        writel(val, ctx->regs + VIDOSD_B(win));

        DRM_DEBUG_KMS("osd pos: tx = %d, ty = %d, bx = %d, by = %d\n",
                        win_data->offset_x, win_data->offset_y, last_x, last_y);

        /* hardware window 0 doesn't support alpha channel. */
        if (win != 0) {
                /* OSD alpha */
                alpha = VIDISD14C_ALPHA1_R(0xf) |
                        VIDISD14C_ALPHA1_G(0xf) |
                        VIDISD14C_ALPHA1_B(0xf);

                writel(alpha, ctx->regs + VIDOSD_C(win));
        }

        /* OSD size */
        if (win != 3 && win != 4) {
                u32 offset = VIDOSD_D(win);
                if (win == 0)
                        offset = VIDOSD_C(win);
                val = win_data->ovl_width * win_data->ovl_height;
                writel(val, ctx->regs + offset);

                DRM_DEBUG_KMS("osd size = 0x%x\n", (unsigned int)val);
        }

        fimd_win_set_pixfmt(ctx, win);

        /* hardware window 0 doesn't support color key. */
        if (win != 0)
                fimd_win_set_colkey(ctx, win);

        /* wincon */
        val = readl(ctx->regs + WINCON(win));
        val |= WINCONx_ENWIN;
        writel(val, ctx->regs + WINCON(win));

        /* Enable DMA channel and unprotect windows */
        fimd_shadow_protect_win(ctx, win, false);

        if (ctx->driver_data->has_shadowcon) {
                val = readl(ctx->regs + SHADOWCON);
                val |= SHADOWCON_CHx_ENABLE(win);
                writel(val, ctx->regs + SHADOWCON);
        }

        win_data->enabled = true;
}

static void fimd_win_disable(struct exynos_drm_manager *mgr, int zpos)
{
        struct fimd_context *ctx = mgr->ctx;
        struct fimd_win_data *win_data;
        int win = zpos;
        u32 val;

        if (win == DEFAULT_ZPOS)
                win = ctx->default_win;

        if (win < 0 || win >= WINDOWS_NR)
                return;

        win_data = &ctx->win_data[win];

        if (ctx->suspended) {
                /* do not resume this window*/
                win_data->resume = false;
                return;
        }

        /* protect windows */
        fimd_shadow_protect_win(ctx, win, true);

        /* wincon */
        val = readl(ctx->regs + WINCON(win));
        val &= ~WINCONx_ENWIN;
        writel(val, ctx->regs + WINCON(win));

        /* unprotect windows */
        if (ctx->driver_data->has_shadowcon) {
                val = readl(ctx->regs + SHADOWCON);
                val &= ~SHADOWCON_CHx_ENABLE(win);
                writel(val, ctx->regs + SHADOWCON);
        }

        fimd_shadow_protect_win(ctx, win, false);

        win_data->enabled = false;
}

static void fimd_clear_win(struct fimd_context *ctx, int win)
{
        writel(0, ctx->regs + WINCON(win));
        writel(0, ctx->regs + VIDOSD_A(win));
        writel(0, ctx->regs + VIDOSD_B(win));
        writel(0, ctx->regs + VIDOSD_C(win));

        if (win == 1 || win == 2)
                writel(0, ctx->regs + VIDOSD_D(win));

        fimd_shadow_protect_win(ctx, win, false);
}

static void fimd_window_suspend(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;
        struct fimd_win_data *win_data;
        int i;

        for (i = 0; i < WINDOWS_NR; i++) {
                win_data = &ctx->win_data[i];
                win_data->resume = win_data->enabled;
                if (win_data->enabled)
                        fimd_win_disable(mgr, i);
        }
        fimd_wait_for_vblank(mgr);
}

static void fimd_window_resume(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;
        struct fimd_win_data *win_data;
        int i;

        for (i = 0; i < WINDOWS_NR; i++) {
                win_data = &ctx->win_data[i];
                win_data->enabled = win_data->resume;
                win_data->resume = false;
        }
}

static void fimd_apply(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;
        struct fimd_win_data *win_data;
        int i;

        for (i = 0; i < WINDOWS_NR; i++) {
                win_data = &ctx->win_data[i];
                if (win_data->enabled)
                        fimd_win_commit(mgr, i);
        }

        fimd_commit(mgr);
}

static int fimd_poweron(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;
        int ret;

        if (!ctx->suspended)
                return 0;

        ctx->suspended = false;

        pm_runtime_get_sync(ctx->dev);

        ret = clk_prepare_enable(ctx->bus_clk);
        if (ret < 0) {
                DRM_ERROR("Failed to prepare_enable the bus clk [%d]\n", ret);
                goto bus_clk_err;
        }

        ret = clk_prepare_enable(ctx->lcd_clk);
        if  (ret < 0) {
                DRM_ERROR("Failed to prepare_enable the lcd clk [%d]\n", ret);
                goto lcd_clk_err;
        }

        /* if vblank was enabled status, enable it again. */
        if (test_and_clear_bit(0, &ctx->irq_flags)) {
                ret = fimd_enable_vblank(mgr);
                if (ret) {
                        DRM_ERROR("Failed to re-enable vblank [%d]\n", ret);
                        goto enable_vblank_err;
                }
        }

        fimd_window_resume(mgr);

        fimd_apply(mgr);

        return 0;

enable_vblank_err:
        clk_disable_unprepare(ctx->lcd_clk);
lcd_clk_err:
        clk_disable_unprepare(ctx->bus_clk);
bus_clk_err:
        ctx->suspended = true;
        return ret;
}

static int fimd_poweroff(struct exynos_drm_manager *mgr)
{
        struct fimd_context *ctx = mgr->ctx;

        if (ctx->suspended)
                return 0;

        /*
         * We need to make sure that all windows are disabled before we
         * suspend that connector. Otherwise we might try to scan from
         * a destroyed buffer later.
         */
        fimd_window_suspend(mgr);

        clk_disable_unprepare(ctx->lcd_clk);
        clk_disable_unprepare(ctx->bus_clk);

        pm_runtime_put_sync(ctx->dev);

        ctx->suspended = true;
        return 0;
}

static void fimd_dpms(struct exynos_drm_manager *mgr, int mode)
{
        DRM_DEBUG_KMS("%s, %d\n", __FILE__, mode);

        switch (mode) {
        case DRM_MODE_DPMS_ON:
                fimd_poweron(mgr);
                break;
        case DRM_MODE_DPMS_STANDBY:
        case DRM_MODE_DPMS_SUSPEND:
        case DRM_MODE_DPMS_OFF:
                fimd_poweroff(mgr);
                break;
        default:
                DRM_DEBUG_KMS("unspecified mode %d\n", mode);
                break;
        }
}

static struct exynos_drm_manager_ops fimd_manager_ops = {
        .initialize = fimd_mgr_initialize,
        .remove = fimd_mgr_remove,
        .dpms = fimd_dpms,
        .mode_fixup = fimd_mode_fixup,
        .mode_set = fimd_mode_set,
        .commit = fimd_commit,
        .enable_vblank = fimd_enable_vblank,
        .disable_vblank = fimd_disable_vblank,
        .wait_for_vblank = fimd_wait_for_vblank,
        .win_mode_set = fimd_win_mode_set,
        .win_commit = fimd_win_commit,
        .win_disable = fimd_win_disable,
};

static struct exynos_drm_manager fimd_manager = {
        .type = EXYNOS_DISPLAY_TYPE_LCD,
        .ops = &fimd_manager_ops,
};

static irqreturn_t fimd_irq_handler(int irq, void *dev_id)
{
        struct fimd_context *ctx = (struct fimd_context *)dev_id;
        u32 val;

        val = readl(ctx->regs + VIDINTCON1);

        if (val & VIDINTCON1_INT_FRAME)
                /* VSYNC interrupt */
                writel(VIDINTCON1_INT_FRAME, ctx->regs + VIDINTCON1);

        /* check the crtc is detached already from encoder */
        if (ctx->pipe < 0 || !ctx->drm_dev)
                goto out;

        drm_handle_vblank(ctx->drm_dev, ctx->pipe);
        exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);

        /* set wait vsync event to zero and wake up queue. */
        if (atomic_read(&ctx->wait_vsync_event)) {
                atomic_set(&ctx->wait_vsync_event, 0);
                wake_up(&ctx->wait_vsync_queue);
        }
out:
        return IRQ_HANDLED;
}

static int fimd_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct fimd_context *ctx;
        struct resource *res;
        int win;
        int ret = -EINVAL;

        if (!dev->of_node)
                return -ENODEV;

        ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
        if (!ctx)
                return -ENOMEM;

        ctx->dev = dev;
        ctx->suspended = true;

        if (of_property_read_bool(dev->of_node, "samsung,invert-vden"))
                ctx->vidcon1 |= VIDCON1_INV_VDEN;
        if (of_property_read_bool(dev->of_node, "samsung,invert-vclk"))
                ctx->vidcon1 |= VIDCON1_INV_VCLK;

        ctx->bus_clk = devm_clk_get(dev, "fimd");
        if (IS_ERR(ctx->bus_clk)) {
                dev_err(dev, "failed to get bus clock\n");
                return PTR_ERR(ctx->bus_clk);
        }

        ctx->lcd_clk = devm_clk_get(dev, "sclk_fimd");
        if (IS_ERR(ctx->lcd_clk)) {
                dev_err(dev, "failed to get lcd clock\n");
                return PTR_ERR(ctx->lcd_clk);
        }

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

        ctx->regs = devm_ioremap_resource(dev, res);
        if (IS_ERR(ctx->regs))
                return PTR_ERR(ctx->regs);

        res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "vsync");
        if (!res) {
                dev_err(dev, "irq request failed.\n");
                return -ENXIO;
        }

        ret = devm_request_irq(dev, res->start, fimd_irq_handler,
                                                        0, "drm_fimd", ctx);
        if (ret) {
                dev_err(dev, "irq request failed.\n");
                return ret;
        }

        ctx->driver_data = drm_fimd_get_driver_data(pdev);
        init_waitqueue_head(&ctx->wait_vsync_queue);
        atomic_set(&ctx->wait_vsync_event, 0);

        platform_set_drvdata(pdev, &fimd_manager);

        fimd_manager.ctx = ctx;
        exynos_drm_manager_register(&fimd_manager);

        exynos_dpi_probe(ctx->dev);

        pm_runtime_enable(dev);

        for (win = 0; win < WINDOWS_NR; win++)
                fimd_clear_win(ctx, win);

        return 0;
}

static int fimd_remove(struct platform_device *pdev)
{
        struct exynos_drm_manager *mgr = platform_get_drvdata(pdev);

        exynos_dpi_remove(&pdev->dev);

        exynos_drm_manager_unregister(&fimd_manager);

        fimd_dpms(mgr, DRM_MODE_DPMS_OFF);

        pm_runtime_disable(&pdev->dev);

        return 0;
}

struct platform_driver fimd_driver = {
        .probe          = fimd_probe,
        .remove         = fimd_remove,
        .driver         = {
                .name   = "exynos4-fb",
                .owner  = THIS_MODULE,
                .of_match_table = fimd_driver_dt_match,
        },
};