hdmi_drv.c

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/*
 * Samsung HDMI interface driver
 *
 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
 *
 * Tomasz Stanislawski, <[email protected]>
 *
 * 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 Foundiation. either version 2 of the License,
 * or (at your option) any later version
 */

#define pr_fmt(fmt) "s5p-tv (hdmi_drv): " fmt

#ifdef CONFIG_VIDEO_SAMSUNG_S5P_HDMI_DEBUG
#define DEBUG
#endif

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <media/v4l2-subdev.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/bug.h>
#include <linux/pm_runtime.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>

#include <media/s5p_hdmi.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>

#include "regs-hdmi.h"

MODULE_AUTHOR("Tomasz Stanislawski, <[email protected]>");
MODULE_DESCRIPTION("Samsung HDMI");
MODULE_LICENSE("GPL");

/* default preset configured on probe */
#define HDMI_DEFAULT_PRESET V4L2_DV_480P59_94

struct hdmi_pulse {
    u32 beg;
    u32 end;
};

struct hdmi_timings {
    struct hdmi_pulse hact;
    u32 hsyn_pol; /* 0 - high, 1 - low */
    struct hdmi_pulse hsyn;
    u32 interlaced;
    struct hdmi_pulse vact[2];
    u32 vsyn_pol; /* 0 - high, 1 - low */
    u32 vsyn_off;
    struct hdmi_pulse vsyn[2];
};

struct hdmi_resources {
    struct clk *hdmi;
    struct clk *sclk_hdmi;
    struct clk *sclk_pixel;
    struct clk *sclk_hdmiphy;
    struct clk *hdmiphy;
    struct regulator_bulk_data *regul_bulk;
    int regul_count;
};

struct hdmi_device {
    void __iomem *regs;
    unsigned int irq;
    struct device *dev;
    struct v4l2_subdev sd;
    struct v4l2_device v4l2_dev;
    struct v4l2_subdev *phy_sd;
    struct v4l2_subdev *mhl_sd;
    const struct hdmi_timings *cur_conf;
    int cur_conf_dirty;
    u32 cur_preset;
    struct hdmi_resources res;
};

static struct platform_device_id hdmi_driver_types[] = {
    {
        .name       = "s5pv210-hdmi",
    }, {
        .name       = "exynos4-hdmi",
    }, {
        /* end node */
    }
};

static const struct v4l2_subdev_ops hdmi_sd_ops;

static struct hdmi_device *sd_to_hdmi_dev(struct v4l2_subdev *sd)
{
    return container_of(sd, struct hdmi_device, sd);
}

static inline
void hdmi_write(struct hdmi_device *hdev, u32 reg_id, u32 value)
{
    writel(value, hdev->regs + reg_id);
}

static inline
void hdmi_write_mask(struct hdmi_device *hdev, u32 reg_id, u32 value, u32 mask)
{
    u32 old = readl(hdev->regs + reg_id);
    value = (value & mask) | (old & ~mask);
    writel(value, hdev->regs + reg_id);
}

static inline
void hdmi_writeb(struct hdmi_device *hdev, u32 reg_id, u8 value)
{
    writeb(value, hdev->regs + reg_id);
}

static inline
void hdmi_writebn(struct hdmi_device *hdev, u32 reg_id, int n, u32 value)
{
    switch (n) {
    default:
        writeb(value >> 24, hdev->regs + reg_id + 12);
    case 3:
        writeb(value >> 16, hdev->regs + reg_id + 8);
    case 2:
        writeb(value >>  8, hdev->regs + reg_id + 4);
    case 1:
        writeb(value >>  0, hdev->regs + reg_id + 0);
    }
}

static inline u32 hdmi_read(struct hdmi_device *hdev, u32 reg_id)
{
    return readl(hdev->regs + reg_id);
}

static irqreturn_t hdmi_irq_handler(int irq, void *dev_data)
{
    struct hdmi_device *hdev = dev_data;
    u32 intc_flag;

    (void)irq;
    intc_flag = hdmi_read(hdev, HDMI_INTC_FLAG);
    /* clearing flags for HPD plug/unplug */
    if (intc_flag & HDMI_INTC_FLAG_HPD_UNPLUG) {
        pr_info("unplugged\n");
        hdmi_write_mask(hdev, HDMI_INTC_FLAG, ~0,
            HDMI_INTC_FLAG_HPD_UNPLUG);
    }
    if (intc_flag & HDMI_INTC_FLAG_HPD_PLUG) {
        pr_info("plugged\n");
        hdmi_write_mask(hdev, HDMI_INTC_FLAG, ~0,
            HDMI_INTC_FLAG_HPD_PLUG);
    }

    return IRQ_HANDLED;
}

static void hdmi_reg_init(struct hdmi_device *hdev)
{
    /* enable HPD interrupts */
    hdmi_write_mask(hdev, HDMI_INTC_CON, ~0, HDMI_INTC_EN_GLOBAL |
        HDMI_INTC_EN_HPD_PLUG | HDMI_INTC_EN_HPD_UNPLUG);
    /* choose DVI mode */
    hdmi_write_mask(hdev, HDMI_MODE_SEL,
        HDMI_MODE_DVI_EN, HDMI_MODE_MASK);
    hdmi_write_mask(hdev, HDMI_CON_2, ~0,
        HDMI_DVI_PERAMBLE_EN | HDMI_DVI_BAND_EN);
    /* disable bluescreen */
    hdmi_write_mask(hdev, HDMI_CON_0, 0, HDMI_BLUE_SCR_EN);
    /* choose bluescreen (fecal) color */
    hdmi_writeb(hdev, HDMI_BLUE_SCREEN_0, 0x12);
    hdmi_writeb(hdev, HDMI_BLUE_SCREEN_1, 0x34);
    hdmi_writeb(hdev, HDMI_BLUE_SCREEN_2, 0x56);
}

static void hdmi_timing_apply(struct hdmi_device *hdev,
    const struct hdmi_timings *t)
{
    /* setting core registers */
    hdmi_writebn(hdev, HDMI_H_BLANK_0, 2, t->hact.beg);
    hdmi_writebn(hdev, HDMI_H_SYNC_GEN_0, 3,
        (t->hsyn_pol << 20) | (t->hsyn.end << 10) | t->hsyn.beg);
    hdmi_writeb(hdev, HDMI_VSYNC_POL, t->vsyn_pol);
    hdmi_writebn(hdev, HDMI_V_BLANK_0, 3,
        (t->vact[0].beg << 11) | t->vact[0].end);
    hdmi_writebn(hdev, HDMI_V_SYNC_GEN_1_0, 3,
        (t->vsyn[0].beg << 12) | t->vsyn[0].end);
    if (t->interlaced) {
        u32 vsyn_trans = t->hsyn.beg + t->vsyn_off;

        hdmi_writeb(hdev, HDMI_INT_PRO_MODE, 1);
        hdmi_writebn(hdev, HDMI_H_V_LINE_0, 3,
            (t->hact.end << 12) | t->vact[1].end);
        hdmi_writebn(hdev, HDMI_V_BLANK_F_0, 3,
            (t->vact[1].end << 11) | t->vact[1].beg);
        hdmi_writebn(hdev, HDMI_V_SYNC_GEN_2_0, 3,
            (t->vsyn[1].beg << 12) | t->vsyn[1].end);
        hdmi_writebn(hdev, HDMI_V_SYNC_GEN_3_0, 3,
            (vsyn_trans << 12) | vsyn_trans);
    } else {
        hdmi_writeb(hdev, HDMI_INT_PRO_MODE, 0);
        hdmi_writebn(hdev, HDMI_H_V_LINE_0, 3,
            (t->hact.end << 12) | t->vact[0].end);
    }

    /* Timing generator registers */
    hdmi_writebn(hdev, HDMI_TG_H_FSZ_L, 2, t->hact.end);
    hdmi_writebn(hdev, HDMI_TG_HACT_ST_L, 2, t->hact.beg);
    hdmi_writebn(hdev, HDMI_TG_HACT_SZ_L, 2, t->hact.end - t->hact.beg);
    hdmi_writebn(hdev, HDMI_TG_VSYNC_L, 2, t->vsyn[0].beg);
    hdmi_writebn(hdev, HDMI_TG_VACT_ST_L, 2, t->vact[0].beg);
    hdmi_writebn(hdev, HDMI_TG_VACT_SZ_L, 2,
        t->vact[0].end - t->vact[0].beg);
    hdmi_writebn(hdev, HDMI_TG_VSYNC_TOP_HDMI_L, 2, t->vsyn[0].beg);
    hdmi_writebn(hdev, HDMI_TG_FIELD_TOP_HDMI_L, 2, t->vsyn[0].beg);
    if (t->interlaced) {
        hdmi_write_mask(hdev, HDMI_TG_CMD, ~0, HDMI_TG_FIELD_EN);
        hdmi_writebn(hdev, HDMI_TG_V_FSZ_L, 2, t->vact[1].end);
        hdmi_writebn(hdev, HDMI_TG_VSYNC2_L, 2, t->vsyn[1].beg);
        hdmi_writebn(hdev, HDMI_TG_FIELD_CHG_L, 2, t->vact[0].end);
        hdmi_writebn(hdev, HDMI_TG_VACT_ST2_L, 2, t->vact[1].beg);
        hdmi_writebn(hdev, HDMI_TG_VSYNC_BOT_HDMI_L, 2, t->vsyn[1].beg);
        hdmi_writebn(hdev, HDMI_TG_FIELD_BOT_HDMI_L, 2, t->vsyn[1].beg);
    } else {
        hdmi_write_mask(hdev, HDMI_TG_CMD, 0, HDMI_TG_FIELD_EN);
        hdmi_writebn(hdev, HDMI_TG_V_FSZ_L, 2, t->vact[0].end);
    }
}

static int hdmi_conf_apply(struct hdmi_device *hdmi_dev)
{
    struct device *dev = hdmi_dev->dev;
    const struct hdmi_timings *conf = hdmi_dev->cur_conf;
    struct v4l2_dv_preset preset;
    int ret;

    dev_dbg(dev, "%s\n", __func__);

    /* skip if conf is already synchronized with HW */
    if (!hdmi_dev->cur_conf_dirty)
        return 0;

    /* reset hdmiphy */
    hdmi_write_mask(hdmi_dev, HDMI_PHY_RSTOUT, ~0, HDMI_PHY_SW_RSTOUT);
    mdelay(10);
    hdmi_write_mask(hdmi_dev, HDMI_PHY_RSTOUT,  0, HDMI_PHY_SW_RSTOUT);
    mdelay(10);

    /* configure presets */
    preset.preset = hdmi_dev->cur_preset;
    ret = v4l2_subdev_call(hdmi_dev->phy_sd, video, s_dv_preset, &preset);
    if (ret) {
        dev_err(dev, "failed to set preset (%u)\n", preset.preset);
        return ret;
    }

    /* resetting HDMI core */
    hdmi_write_mask(hdmi_dev, HDMI_CORE_RSTOUT,  0, HDMI_CORE_SW_RSTOUT);
    mdelay(10);
    hdmi_write_mask(hdmi_dev, HDMI_CORE_RSTOUT, ~0, HDMI_CORE_SW_RSTOUT);
    mdelay(10);

    hdmi_reg_init(hdmi_dev);

    /* setting core registers */
    hdmi_timing_apply(hdmi_dev, conf);

    hdmi_dev->cur_conf_dirty = 0;

    return 0;
}

static void hdmi_dumpregs(struct hdmi_device *hdev, char *prefix)
{
#define DUMPREG(reg_id) \
    dev_dbg(hdev->dev, "%s:" #reg_id " = %08x\n", prefix, \
        readl(hdev->regs + reg_id))

    dev_dbg(hdev->dev, "%s: ---- CONTROL REGISTERS ----\n", prefix);
    DUMPREG(HDMI_INTC_FLAG);
    DUMPREG(HDMI_INTC_CON);
    DUMPREG(HDMI_HPD_STATUS);
    DUMPREG(HDMI_PHY_RSTOUT);
    DUMPREG(HDMI_PHY_VPLL);
    DUMPREG(HDMI_PHY_CMU);
    DUMPREG(HDMI_CORE_RSTOUT);

    dev_dbg(hdev->dev, "%s: ---- CORE REGISTERS ----\n", prefix);
    DUMPREG(HDMI_CON_0);
    DUMPREG(HDMI_CON_1);
    DUMPREG(HDMI_CON_2);
    DUMPREG(HDMI_SYS_STATUS);
    DUMPREG(HDMI_PHY_STATUS);
    DUMPREG(HDMI_STATUS_EN);
    DUMPREG(HDMI_HPD);
    DUMPREG(HDMI_MODE_SEL);
    DUMPREG(HDMI_HPD_GEN);
    DUMPREG(HDMI_DC_CONTROL);
    DUMPREG(HDMI_VIDEO_PATTERN_GEN);

    dev_dbg(hdev->dev, "%s: ---- CORE SYNC REGISTERS ----\n", prefix);
    DUMPREG(HDMI_H_BLANK_0);
    DUMPREG(HDMI_H_BLANK_1);
    DUMPREG(HDMI_V_BLANK_0);
    DUMPREG(HDMI_V_BLANK_1);
    DUMPREG(HDMI_V_BLANK_2);
    DUMPREG(HDMI_H_V_LINE_0);
    DUMPREG(HDMI_H_V_LINE_1);
    DUMPREG(HDMI_H_V_LINE_2);
    DUMPREG(HDMI_VSYNC_POL);
    DUMPREG(HDMI_INT_PRO_MODE);
    DUMPREG(HDMI_V_BLANK_F_0);
    DUMPREG(HDMI_V_BLANK_F_1);
    DUMPREG(HDMI_V_BLANK_F_2);
    DUMPREG(HDMI_H_SYNC_GEN_0);
    DUMPREG(HDMI_H_SYNC_GEN_1);
    DUMPREG(HDMI_H_SYNC_GEN_2);
    DUMPREG(HDMI_V_SYNC_GEN_1_0);
    DUMPREG(HDMI_V_SYNC_GEN_1_1);
    DUMPREG(HDMI_V_SYNC_GEN_1_2);
    DUMPREG(HDMI_V_SYNC_GEN_2_0);
    DUMPREG(HDMI_V_SYNC_GEN_2_1);
    DUMPREG(HDMI_V_SYNC_GEN_2_2);
    DUMPREG(HDMI_V_SYNC_GEN_3_0);
    DUMPREG(HDMI_V_SYNC_GEN_3_1);
    DUMPREG(HDMI_V_SYNC_GEN_3_2);

    dev_dbg(hdev->dev, "%s: ---- TG REGISTERS ----\n", prefix);
    DUMPREG(HDMI_TG_CMD);
    DUMPREG(HDMI_TG_H_FSZ_L);
    DUMPREG(HDMI_TG_H_FSZ_H);
    DUMPREG(HDMI_TG_HACT_ST_L);
    DUMPREG(HDMI_TG_HACT_ST_H);
    DUMPREG(HDMI_TG_HACT_SZ_L);
    DUMPREG(HDMI_TG_HACT_SZ_H);
    DUMPREG(HDMI_TG_V_FSZ_L);
    DUMPREG(HDMI_TG_V_FSZ_H);
    DUMPREG(HDMI_TG_VSYNC_L);
    DUMPREG(HDMI_TG_VSYNC_H);
    DUMPREG(HDMI_TG_VSYNC2_L);
    DUMPREG(HDMI_TG_VSYNC2_H);
    DUMPREG(HDMI_TG_VACT_ST_L);
    DUMPREG(HDMI_TG_VACT_ST_H);
    DUMPREG(HDMI_TG_VACT_SZ_L);
    DUMPREG(HDMI_TG_VACT_SZ_H);
    DUMPREG(HDMI_TG_FIELD_CHG_L);
    DUMPREG(HDMI_TG_FIELD_CHG_H);
    DUMPREG(HDMI_TG_VACT_ST2_L);
    DUMPREG(HDMI_TG_VACT_ST2_H);
    DUMPREG(HDMI_TG_VSYNC_TOP_HDMI_L);
    DUMPREG(HDMI_TG_VSYNC_TOP_HDMI_H);
    DUMPREG(HDMI_TG_VSYNC_BOT_HDMI_L);
    DUMPREG(HDMI_TG_VSYNC_BOT_HDMI_H);
    DUMPREG(HDMI_TG_FIELD_TOP_HDMI_L);
    DUMPREG(HDMI_TG_FIELD_TOP_HDMI_H);
    DUMPREG(HDMI_TG_FIELD_BOT_HDMI_L);
    DUMPREG(HDMI_TG_FIELD_BOT_HDMI_H);
#undef DUMPREG
}

static const struct hdmi_timings hdmi_timings_480p = {
    .hact = { .beg = 138, .end = 858 },
    .hsyn_pol = 1,
    .hsyn = { .beg = 16, .end = 16 + 62 },
    .interlaced = 0,
    .vact[0] = { .beg = 42 + 3, .end = 522 + 3 },
    .vsyn_pol = 1,
    .vsyn[0] = { .beg = 6 + 3, .end = 12 + 3},
};

static const struct hdmi_timings hdmi_timings_576p50 = {
    .hact = { .beg = 144, .end = 864 },
    .hsyn_pol = 1,
    .hsyn = { .beg = 12, .end = 12 + 64 },
    .interlaced = 0,
    .vact[0] = { .beg = 44 + 5, .end = 620 + 5 },
    .vsyn_pol = 1,
    .vsyn[0] = { .beg = 0 + 5, .end = 5 + 5},
};

static const struct hdmi_timings hdmi_timings_720p60 = {
    .hact = { .beg = 370, .end = 1650 },
    .hsyn_pol = 0,
    .hsyn = { .beg = 110, .end = 110 + 40 },
    .interlaced = 0,
    .vact[0] = { .beg = 25 + 5, .end = 745 + 5 },
    .vsyn_pol = 0,
    .vsyn[0] = { .beg = 0 + 5, .end = 5 + 5},
};

static const struct hdmi_timings hdmi_timings_720p50 = {
    .hact = { .beg = 700, .end = 1980 },
    .hsyn_pol = 0,
    .hsyn = { .beg = 440, .end = 440 + 40 },
    .interlaced = 0,
    .vact[0] = { .beg = 25 + 5, .end = 745 + 5 },
    .vsyn_pol = 0,
    .vsyn[0] = { .beg = 0 + 5, .end = 5 + 5},
};

static const struct hdmi_timings hdmi_timings_1080p24 = {
    .hact = { .beg = 830, .end = 2750 },
    .hsyn_pol = 0,
    .hsyn = { .beg = 638, .end = 638 + 44 },
    .interlaced = 0,
    .vact[0] = { .beg = 41 + 4, .end = 1121 + 4 },
    .vsyn_pol = 0,
    .vsyn[0] = { .beg = 0 + 4, .end = 5 + 4},
};

static const struct hdmi_timings hdmi_timings_1080p60 = {
    .hact = { .beg = 280, .end = 2200 },
    .hsyn_pol = 0,
    .hsyn = { .beg = 88, .end = 88 + 44 },
    .interlaced = 0,
    .vact[0] = { .beg = 41 + 4, .end = 1121 + 4 },
    .vsyn_pol = 0,
    .vsyn[0] = { .beg = 0 + 4, .end = 5 + 4},
};

static const struct hdmi_timings hdmi_timings_1080i60 = {
    .hact = { .beg = 280, .end = 2200 },
    .hsyn_pol = 0,
    .hsyn = { .beg = 88, .end = 88 + 44 },
    .interlaced = 1,
    .vact[0] = { .beg = 20 + 2, .end = 560 + 2 },
    .vact[1] = { .beg = 583 + 2, .end = 1123 + 2 },
    .vsyn_pol = 0,
    .vsyn_off = 1100,
    .vsyn[0] = { .beg = 0 + 2, .end = 5 + 2},
    .vsyn[1] = { .beg = 562 + 2, .end = 567 + 2},
};

static const struct hdmi_timings hdmi_timings_1080i50 = {
    .hact = { .beg = 720, .end = 2640 },
    .hsyn_pol = 0,
    .hsyn = { .beg = 528, .end = 528 + 44 },
    .interlaced = 1,
    .vact[0] = { .beg = 20 + 2, .end = 560 + 2 },
    .vact[1] = { .beg = 583 + 2, .end = 1123 + 2 },
    .vsyn_pol = 0,
    .vsyn_off = 1320,
    .vsyn[0] = { .beg = 0 + 2, .end = 5 + 2},
    .vsyn[1] = { .beg = 562 + 2, .end = 567 + 2},
};

static const struct hdmi_timings hdmi_timings_1080p50 = {
    .hact = { .beg = 720, .end = 2640 },
    .hsyn_pol = 0,
    .hsyn = { .beg = 528, .end = 528 + 44 },
    .interlaced = 0,
    .vact[0] = { .beg = 41 + 4, .end = 1121 + 4 },
    .vsyn_pol = 0,
    .vsyn[0] = { .beg = 0 + 4, .end = 5 + 4},
};

static const struct {
    u32 preset;
    const struct hdmi_timings *timings;
} hdmi_timings[] = {
    { V4L2_DV_480P59_94, &hdmi_timings_480p },
    { V4L2_DV_576P50, &hdmi_timings_576p50 },
    { V4L2_DV_720P50, &hdmi_timings_720p50 },
    { V4L2_DV_720P59_94, &hdmi_timings_720p60 },
    { V4L2_DV_720P60, &hdmi_timings_720p60 },
    { V4L2_DV_1080P24, &hdmi_timings_1080p24 },
    { V4L2_DV_1080P30, &hdmi_timings_1080p60 },
    { V4L2_DV_1080P50, &hdmi_timings_1080p50 },
    { V4L2_DV_1080I50, &hdmi_timings_1080i50 },
    { V4L2_DV_1080I60, &hdmi_timings_1080i60 },
    { V4L2_DV_1080P60, &hdmi_timings_1080p60 },
};

static const struct hdmi_timings *hdmi_preset2timings(u32 preset)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(hdmi_timings); ++i)
        if (hdmi_timings[i].preset == preset)
            return  hdmi_timings[i].timings;
    return NULL;
}

static int hdmi_streamon(struct hdmi_device *hdev)
{
    struct device *dev = hdev->dev;
    struct hdmi_resources *res = &hdev->res;
    int ret, tries;

    dev_dbg(dev, "%s\n", __func__);

    ret = hdmi_conf_apply(hdev);
    if (ret)
        return ret;

    ret = v4l2_subdev_call(hdev->phy_sd, video, s_stream, 1);
    if (ret)
        return ret;

    /* waiting for HDMIPHY's PLL to get to steady state */
    for (tries = 100; tries; --tries) {
        u32 val = hdmi_read(hdev, HDMI_PHY_STATUS);
        if (val & HDMI_PHY_STATUS_READY)
            break;
        mdelay(1);
    }
    /* steady state not achieved */
    if (tries == 0) {
        dev_err(dev, "hdmiphy's pll could not reach steady state.\n");
        v4l2_subdev_call(hdev->phy_sd, video, s_stream, 0);
        hdmi_dumpregs(hdev, "hdmiphy - s_stream");
        return -EIO;
    }

    /* starting MHL */
    ret = v4l2_subdev_call(hdev->mhl_sd, video, s_stream, 1);
    if (hdev->mhl_sd && ret) {
        v4l2_subdev_call(hdev->phy_sd, video, s_stream, 0);
        hdmi_dumpregs(hdev, "mhl - s_stream");
        return -EIO;
    }

    /* hdmiphy clock is used for HDMI in streaming mode */
    clk_disable(res->sclk_hdmi);
    clk_set_parent(res->sclk_hdmi, res->sclk_hdmiphy);
    clk_enable(res->sclk_hdmi);

    /* enable HDMI and timing generator */
    hdmi_write_mask(hdev, HDMI_CON_0, ~0, HDMI_EN);
    hdmi_write_mask(hdev, HDMI_TG_CMD, ~0, HDMI_TG_EN);
    hdmi_dumpregs(hdev, "streamon");
    return 0;
}

static int hdmi_streamoff(struct hdmi_device *hdev)
{
    struct device *dev = hdev->dev;
    struct hdmi_resources *res = &hdev->res;

    dev_dbg(dev, "%s\n", __func__);

    hdmi_write_mask(hdev, HDMI_CON_0, 0, HDMI_EN);
    hdmi_write_mask(hdev, HDMI_TG_CMD, 0, HDMI_TG_EN);

    /* pixel(vpll) clock is used for HDMI in config mode */
    clk_disable(res->sclk_hdmi);
    clk_set_parent(res->sclk_hdmi, res->sclk_pixel);
    clk_enable(res->sclk_hdmi);

    v4l2_subdev_call(hdev->mhl_sd, video, s_stream, 0);
    v4l2_subdev_call(hdev->phy_sd, video, s_stream, 0);

    hdmi_dumpregs(hdev, "streamoff");
    return 0;
}

static int hdmi_s_stream(struct v4l2_subdev *sd, int enable)
{
    struct hdmi_device *hdev = sd_to_hdmi_dev(sd);
    struct device *dev = hdev->dev;

    dev_dbg(dev, "%s(%d)\n", __func__, enable);
    if (enable)
        return hdmi_streamon(hdev);
    return hdmi_streamoff(hdev);
}

static void hdmi_resource_poweron(struct hdmi_resources *res)
{
    /* turn HDMI power on */
    regulator_bulk_enable(res->regul_count, res->regul_bulk);
    /* power-on hdmi physical interface */
    clk_enable(res->hdmiphy);
    /* use VPP as parent clock; HDMIPHY is not working yet */
    clk_set_parent(res->sclk_hdmi, res->sclk_pixel);
    /* turn clocks on */
    clk_enable(res->sclk_hdmi);
}

static void hdmi_resource_poweroff(struct hdmi_resources *res)
{
    /* turn clocks off */
    clk_disable(res->sclk_hdmi);
    /* power-off hdmiphy */
    clk_disable(res->hdmiphy);
    /* turn HDMI power off */
    regulator_bulk_disable(res->regul_count, res->regul_bulk);
}

static int hdmi_s_power(struct v4l2_subdev *sd, int on)
{
    struct hdmi_device *hdev = sd_to_hdmi_dev(sd);
    int ret;

    if (on)
        ret = pm_runtime_get_sync(hdev->dev);
    else
        ret = pm_runtime_put_sync(hdev->dev);
    /* only values < 0 indicate errors */
    return IS_ERR_VALUE(ret) ? ret : 0;
}

static int hdmi_s_dv_preset(struct v4l2_subdev *sd,
    struct v4l2_dv_preset *preset)
{
    struct hdmi_device *hdev = sd_to_hdmi_dev(sd);
    struct device *dev = hdev->dev;
    const struct hdmi_timings *conf;

    conf = hdmi_preset2timings(preset->preset);
    if (conf == NULL) {
        dev_err(dev, "preset (%u) not supported\n", preset->preset);
        return -EINVAL;
    }
    hdev->cur_conf = conf;
    hdev->cur_conf_dirty = 1;
    hdev->cur_preset = preset->preset;
    return 0;
}

static int hdmi_g_dv_preset(struct v4l2_subdev *sd,
    struct v4l2_dv_preset *preset)
{
    memset(preset, 0, sizeof(*preset));
    preset->preset = sd_to_hdmi_dev(sd)->cur_preset;
    return 0;
}

static int hdmi_g_mbus_fmt(struct v4l2_subdev *sd,
      struct v4l2_mbus_framefmt *fmt)
{
    struct hdmi_device *hdev = sd_to_hdmi_dev(sd);
    const struct hdmi_timings *t = hdev->cur_conf;

    dev_dbg(hdev->dev, "%s\n", __func__);
    if (!hdev->cur_conf)
        return -EINVAL;
    memset(fmt, 0, sizeof *fmt);
    fmt->width = t->hact.end - t->hact.beg;
    fmt->height = t->vact[0].end - t->vact[0].beg;
    fmt->code = V4L2_MBUS_FMT_FIXED; /* means RGB888 */
    fmt->colorspace = V4L2_COLORSPACE_SRGB;
    if (t->interlaced) {
        fmt->field = V4L2_FIELD_INTERLACED;
        fmt->height *= 2;
    } else {
        fmt->field = V4L2_FIELD_NONE;
    }
    return 0;
}

static int hdmi_enum_dv_presets(struct v4l2_subdev *sd,
    struct v4l2_dv_enum_preset *preset)
{
    if (preset->index >= ARRAY_SIZE(hdmi_timings))
        return -EINVAL;
    return v4l_fill_dv_preset_info(hdmi_timings[preset->index].preset,
        preset);
}

static const struct v4l2_subdev_core_ops hdmi_sd_core_ops = {
    .s_power = hdmi_s_power,
};

static const struct v4l2_subdev_video_ops hdmi_sd_video_ops = {
    .s_dv_preset = hdmi_s_dv_preset,
    .g_dv_preset = hdmi_g_dv_preset,
    .enum_dv_presets = hdmi_enum_dv_presets,
    .g_mbus_fmt = hdmi_g_mbus_fmt,
    .s_stream = hdmi_s_stream,
};

static const struct v4l2_subdev_ops hdmi_sd_ops = {
    .core = &hdmi_sd_core_ops,
    .video = &hdmi_sd_video_ops,
};

static int hdmi_runtime_suspend(struct device *dev)
{
    struct v4l2_subdev *sd = dev_get_drvdata(dev);
    struct hdmi_device *hdev = sd_to_hdmi_dev(sd);

    dev_dbg(dev, "%s\n", __func__);
    v4l2_subdev_call(hdev->mhl_sd, core, s_power, 0);
    hdmi_resource_poweroff(&hdev->res);
    /* flag that device context is lost */
    hdev->cur_conf_dirty = 1;
    return 0;
}

static int hdmi_runtime_resume(struct device *dev)
{
    struct v4l2_subdev *sd = dev_get_drvdata(dev);
    struct hdmi_device *hdev = sd_to_hdmi_dev(sd);
    int ret = 0;

    dev_dbg(dev, "%s\n", __func__);

    hdmi_resource_poweron(&hdev->res);

    /* starting MHL */
    ret = v4l2_subdev_call(hdev->mhl_sd, core, s_power, 1);
    if (hdev->mhl_sd && ret)
        goto fail;

    dev_dbg(dev, "poweron succeed\n");

    return 0;

fail:
    hdmi_resource_poweroff(&hdev->res);
    dev_err(dev, "poweron failed\n");

    return ret;
}

static const struct dev_pm_ops hdmi_pm_ops = {
    .runtime_suspend = hdmi_runtime_suspend,
    .runtime_resume  = hdmi_runtime_resume,
};

static void hdmi_resources_cleanup(struct hdmi_device *hdev)
{
    struct hdmi_resources *res = &hdev->res;

    dev_dbg(hdev->dev, "HDMI resource cleanup\n");
    /* put clocks, power */
    if (res->regul_count)
        regulator_bulk_free(res->regul_count, res->regul_bulk);
    /* kfree is NULL-safe */
    kfree(res->regul_bulk);
    if (!IS_ERR_OR_NULL(res->hdmiphy))
        clk_put(res->hdmiphy);
    if (!IS_ERR_OR_NULL(res->sclk_hdmiphy))
        clk_put(res->sclk_hdmiphy);
    if (!IS_ERR_OR_NULL(res->sclk_pixel))
        clk_put(res->sclk_pixel);
    if (!IS_ERR_OR_NULL(res->sclk_hdmi))
        clk_put(res->sclk_hdmi);
    if (!IS_ERR_OR_NULL(res->hdmi))
        clk_put(res->hdmi);
    memset(res, 0, sizeof *res);
}

static int hdmi_resources_init(struct hdmi_device *hdev)
{
    struct device *dev = hdev->dev;
    struct hdmi_resources *res = &hdev->res;
    static char *supply[] = {
        "hdmi-en",
        "vdd",
        "vdd_osc",
        "vdd_pll",
    };
    int i, ret;

    dev_dbg(dev, "HDMI resource init\n");

    memset(res, 0, sizeof *res);
    /* get clocks, power */

    res->hdmi = clk_get(dev, "hdmi");
    if (IS_ERR_OR_NULL(res->hdmi)) {
        dev_err(dev, "failed to get clock 'hdmi'\n");
        goto fail;
    }
    res->sclk_hdmi = clk_get(dev, "sclk_hdmi");
    if (IS_ERR_OR_NULL(res->sclk_hdmi)) {
        dev_err(dev, "failed to get clock 'sclk_hdmi'\n");
        goto fail;
    }
    res->sclk_pixel = clk_get(dev, "sclk_pixel");
    if (IS_ERR_OR_NULL(res->sclk_pixel)) {
        dev_err(dev, "failed to get clock 'sclk_pixel'\n");
        goto fail;
    }
    res->sclk_hdmiphy = clk_get(dev, "sclk_hdmiphy");
    if (IS_ERR_OR_NULL(res->sclk_hdmiphy)) {
        dev_err(dev, "failed to get clock 'sclk_hdmiphy'\n");
        goto fail;
    }
    res->hdmiphy = clk_get(dev, "hdmiphy");
    if (IS_ERR_OR_NULL(res->hdmiphy)) {
        dev_err(dev, "failed to get clock 'hdmiphy'\n");
        goto fail;
    }
    res->regul_bulk = kcalloc(ARRAY_SIZE(supply),
                  sizeof(res->regul_bulk[0]), GFP_KERNEL);
    if (!res->regul_bulk) {
        dev_err(dev, "failed to get memory for regulators\n");
        goto fail;
    }
    for (i = 0; i < ARRAY_SIZE(supply); ++i) {
        res->regul_bulk[i].supply = supply[i];
        res->regul_bulk[i].consumer = NULL;
    }

    ret = regulator_bulk_get(dev, ARRAY_SIZE(supply), res->regul_bulk);
    if (ret) {
        dev_err(dev, "failed to get regulators\n");
        goto fail;
    }
    res->regul_count = ARRAY_SIZE(supply);

    return 0;
fail:
    dev_err(dev, "HDMI resource init - failed\n");
    hdmi_resources_cleanup(hdev);
    return -ENODEV;
}

static int __devinit hdmi_probe(struct platform_device *pdev)
{
    struct device *dev = &pdev->dev;
    struct resource *res;
    struct i2c_adapter *adapter;
    struct v4l2_subdev *sd;
    struct hdmi_device *hdmi_dev = NULL;
    struct s5p_hdmi_platform_data *pdata = dev->platform_data;
    int ret;

    dev_dbg(dev, "probe start\n");

    if (!pdata) {
        dev_err(dev, "platform data is missing\n");
        ret = -ENODEV;
        goto fail;
    }

    hdmi_dev = devm_kzalloc(&pdev->dev, sizeof(*hdmi_dev), GFP_KERNEL);
    if (!hdmi_dev) {
        dev_err(dev, "out of memory\n");
        ret = -ENOMEM;
        goto fail;
    }

    hdmi_dev->dev = dev;

    ret = hdmi_resources_init(hdmi_dev);
    if (ret)
        goto fail;

    /* mapping HDMI registers */
    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (res == NULL) {
        dev_err(dev, "get memory resource failed.\n");
        ret = -ENXIO;
        goto fail_init;
    }

    hdmi_dev->regs = devm_ioremap(&pdev->dev, res->start,
                      resource_size(res));
    if (hdmi_dev->regs == NULL) {
        dev_err(dev, "register mapping failed.\n");
        ret = -ENXIO;
        goto fail_init;
    }

    res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (res == NULL) {
        dev_err(dev, "get interrupt resource failed.\n");
        ret = -ENXIO;
        goto fail_init;
    }

    ret = devm_request_irq(&pdev->dev, res->start, hdmi_irq_handler, 0,
                   "hdmi", hdmi_dev);
    if (ret) {
        dev_err(dev, "request interrupt failed.\n");
        goto fail_init;
    }
    hdmi_dev->irq = res->start;

    /* setting v4l2 name to prevent WARN_ON in v4l2_device_register */
    strlcpy(hdmi_dev->v4l2_dev.name, dev_name(dev),
        sizeof(hdmi_dev->v4l2_dev.name));
    /* passing NULL owner prevents driver from erasing drvdata */
    ret = v4l2_device_register(NULL, &hdmi_dev->v4l2_dev);
    if (ret) {
        dev_err(dev, "could not register v4l2 device.\n");
        goto fail_init;
    }

    /* testing if hdmiphy info is present */
    if (!pdata->hdmiphy_info) {
        dev_err(dev, "hdmiphy info is missing in platform data\n");
        ret = -ENXIO;
        goto fail_vdev;
    }

    adapter = i2c_get_adapter(pdata->hdmiphy_bus);
    if (adapter == NULL) {
        dev_err(dev, "hdmiphy adapter request failed\n");
        ret = -ENXIO;
        goto fail_vdev;
    }

    hdmi_dev->phy_sd = v4l2_i2c_new_subdev_board(&hdmi_dev->v4l2_dev,
        adapter, pdata->hdmiphy_info, NULL);
    /* on failure or not adapter is no longer useful */
    i2c_put_adapter(adapter);
    if (hdmi_dev->phy_sd == NULL) {
        dev_err(dev, "missing subdev for hdmiphy\n");
        ret = -ENODEV;
        goto fail_vdev;
    }

    /* initialization of MHL interface if present */
    if (pdata->mhl_info) {
        adapter = i2c_get_adapter(pdata->mhl_bus);
        if (adapter == NULL) {
            dev_err(dev, "MHL adapter request failed\n");
            ret = -ENXIO;
            goto fail_vdev;
        }

        hdmi_dev->mhl_sd = v4l2_i2c_new_subdev_board(
            &hdmi_dev->v4l2_dev, adapter,
            pdata->mhl_info, NULL);
        /* on failure or not adapter is no longer useful */
        i2c_put_adapter(adapter);
        if (hdmi_dev->mhl_sd == NULL) {
            dev_err(dev, "missing subdev for MHL\n");
            ret = -ENODEV;
            goto fail_vdev;
        }
    }

    clk_enable(hdmi_dev->res.hdmi);

    pm_runtime_enable(dev);

    sd = &hdmi_dev->sd;
    v4l2_subdev_init(sd, &hdmi_sd_ops);
    sd->owner = THIS_MODULE;

    strlcpy(sd->name, "s5p-hdmi", sizeof sd->name);
    hdmi_dev->cur_preset = HDMI_DEFAULT_PRESET;
    /* FIXME: missing fail preset is not supported */
    hdmi_dev->cur_conf = hdmi_preset2timings(hdmi_dev->cur_preset);
    hdmi_dev->cur_conf_dirty = 1;

    /* storing subdev for call that have only access to struct device */
    dev_set_drvdata(dev, sd);

    dev_info(dev, "probe successful\n");

    return 0;

fail_vdev:
    v4l2_device_unregister(&hdmi_dev->v4l2_dev);

fail_init:
    hdmi_resources_cleanup(hdmi_dev);

fail:
    dev_err(dev, "probe failed\n");
    return ret;
}

static int __devexit hdmi_remove(struct platform_device *pdev)
{
    struct device *dev = &pdev->dev;
    struct v4l2_subdev *sd = dev_get_drvdata(dev);
    struct hdmi_device *hdmi_dev = sd_to_hdmi_dev(sd);

    pm_runtime_disable(dev);
    clk_disable(hdmi_dev->res.hdmi);
    v4l2_device_unregister(&hdmi_dev->v4l2_dev);
    disable_irq(hdmi_dev->irq);
    hdmi_resources_cleanup(hdmi_dev);
    dev_info(dev, "remove successful\n");

    return 0;
}

static struct platform_driver hdmi_driver __refdata = {
    .probe = hdmi_probe,
    .remove = __devexit_p(hdmi_remove),
    .id_table = hdmi_driver_types,
    .driver = {
        .name = "s5p-hdmi",
        .owner = THIS_MODULE,
        .pm = &hdmi_pm_ops,
    }
};

module_platform_driver(hdmi_driver);