dw-hdmi.c

/*
 * DesignWare High-Definition Multimedia Interface (HDMI) driver
 *
 * Copyright (C) 2013-2015 Mentor Graphics Inc.
 * Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 *
 * 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 <linux/module.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/hdmi.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/spinlock.h>

#include <drm/drm_of.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder_slave.h>
#include <drm/bridge/dw_hdmi.h>

#include "dw-hdmi.h"
#include "dw-hdmi-audio.h"

#define HDMI_EDID_LEN		512

#define RGB			0
#define YCBCR444		1
#define YCBCR422_16BITS		2
#define YCBCR422_8BITS		3
#define XVYCC444		4

enum hdmi_datamap {
	RGB444_8B = 0x01,
	RGB444_10B = 0x03,
	RGB444_12B = 0x05,
	RGB444_16B = 0x07,
	YCbCr444_8B = 0x09,
	YCbCr444_10B = 0x0B,
	YCbCr444_12B = 0x0D,
	YCbCr444_16B = 0x0F,
	YCbCr422_8B = 0x16,
	YCbCr422_10B = 0x14,
	YCbCr422_12B = 0x12,
};

static const u16 csc_coeff_default[3][4] = {
	{ 0x2000, 0x0000, 0x0000, 0x0000 },
	{ 0x0000, 0x2000, 0x0000, 0x0000 },
	{ 0x0000, 0x0000, 0x2000, 0x0000 }
};

static const u16 csc_coeff_rgb_out_eitu601[3][4] = {
	{ 0x2000, 0x6926, 0x74fd, 0x010e },
	{ 0x2000, 0x2cdd, 0x0000, 0x7e9a },
	{ 0x2000, 0x0000, 0x38b4, 0x7e3b }
};

static const u16 csc_coeff_rgb_out_eitu709[3][4] = {
	{ 0x2000, 0x7106, 0x7a02, 0x00a7 },
	{ 0x2000, 0x3264, 0x0000, 0x7e6d },
	{ 0x2000, 0x0000, 0x3b61, 0x7e25 }
};

static const u16 csc_coeff_rgb_in_eitu601[3][4] = {
	{ 0x2591, 0x1322, 0x074b, 0x0000 },
	{ 0x6535, 0x2000, 0x7acc, 0x0200 },
	{ 0x6acd, 0x7534, 0x2000, 0x0200 }
};

static const u16 csc_coeff_rgb_in_eitu709[3][4] = {
	{ 0x2dc5, 0x0d9b, 0x049e, 0x0000 },
	{ 0x62f0, 0x2000, 0x7d11, 0x0200 },
	{ 0x6756, 0x78ab, 0x2000, 0x0200 }
};

struct hdmi_vmode {
	bool mdataenablepolarity;

	unsigned int mpixelclock;
	unsigned int mpixelrepetitioninput;
	unsigned int mpixelrepetitionoutput;
};

struct hdmi_data_info {
	unsigned int enc_in_format;
	unsigned int enc_out_format;
	unsigned int enc_color_depth;
	unsigned int colorimetry;
	unsigned int pix_repet_factor;
	unsigned int hdcp_enable;
	struct hdmi_vmode video_mode;
};

struct dw_hdmi_i2c {
	struct i2c_adapter	adap;

	struct mutex		lock;	/* used to serialize data transfers */
	struct completion	cmp;
	u8			stat;

	u8			slave_reg;
	bool			is_regaddr;
};

struct dw_hdmi {
	struct drm_connector connector;
	struct drm_encoder *encoder;
	struct drm_bridge *bridge;

	struct platform_device *audio;
	enum dw_hdmi_devtype dev_type;
	struct device *dev;
	struct clk *isfr_clk;
	struct clk *iahb_clk;
	struct dw_hdmi_i2c *i2c;

	struct hdmi_data_info hdmi_data;
	const struct dw_hdmi_plat_data *plat_data;

	int vic;

	u8 edid[HDMI_EDID_LEN];
	bool cable_plugin;

	bool phy_enabled;
	struct drm_display_mode previous_mode;

	struct i2c_adapter *ddc;
	void __iomem *regs;
	bool sink_is_hdmi;
	bool sink_has_audio;

	struct mutex mutex;		/* for state below and previous_mode */
	enum drm_connector_force force;	/* mutex-protected force state */
	bool disabled;			/* DRM has disabled our bridge */
	bool bridge_is_on;		/* indicates the bridge is on */
	bool rxsense;			/* rxsense state */
	u8 phy_mask;			/* desired phy int mask settings */

	spinlock_t audio_lock;
	struct mutex audio_mutex;
	unsigned int sample_rate;
	unsigned int audio_cts;
	unsigned int audio_n;
	bool audio_enable;

	void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
	u8 (*read)(struct dw_hdmi *hdmi, int offset);
};

#define HDMI_IH_PHY_STAT0_RX_SENSE \
	(HDMI_IH_PHY_STAT0_RX_SENSE0 | HDMI_IH_PHY_STAT0_RX_SENSE1 | \
	 HDMI_IH_PHY_STAT0_RX_SENSE2 | HDMI_IH_PHY_STAT0_RX_SENSE3)

#define HDMI_PHY_RX_SENSE \
	(HDMI_PHY_RX_SENSE0 | HDMI_PHY_RX_SENSE1 | \
	 HDMI_PHY_RX_SENSE2 | HDMI_PHY_RX_SENSE3)

static void dw_hdmi_writel(struct dw_hdmi *hdmi, u8 val, int offset)
{
	writel(val, hdmi->regs + (offset << 2));
}

static u8 dw_hdmi_readl(struct dw_hdmi *hdmi, int offset)
{
	return readl(hdmi->regs + (offset << 2));
}

static void dw_hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset)
{
	writeb(val, hdmi->regs + offset);
}

static u8 dw_hdmi_readb(struct dw_hdmi *hdmi, int offset)
{
	return readb(hdmi->regs + offset);
}

static inline void hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset)
{
	hdmi->write(hdmi, val, offset);
}

static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset)
{
	return hdmi->read(hdmi, offset);
}

static void hdmi_modb(struct dw_hdmi *hdmi, u8 data, u8 mask, unsigned reg)
{
	u8 val = hdmi_readb(hdmi, reg) & ~mask;

	val |= data & mask;
	hdmi_writeb(hdmi, val, reg);
}

static void hdmi_mask_writeb(struct dw_hdmi *hdmi, u8 data, unsigned int reg,
			     u8 shift, u8 mask)
{
	hdmi_modb(hdmi, data << shift, mask, reg);
}

static void dw_hdmi_i2c_init(struct dw_hdmi *hdmi)
{
	/* Software reset */
	hdmi_writeb(hdmi, 0x00, HDMI_I2CM_SOFTRSTZ);

	/* Set Standard Mode speed (determined to be 100KHz on iMX6) */
	hdmi_writeb(hdmi, 0x00, HDMI_I2CM_DIV);

	/* Set done, not acknowledged and arbitration interrupt polarities */
	hdmi_writeb(hdmi, HDMI_I2CM_INT_DONE_POL, HDMI_I2CM_INT);
	hdmi_writeb(hdmi, HDMI_I2CM_CTLINT_NAC_POL | HDMI_I2CM_CTLINT_ARB_POL,
		    HDMI_I2CM_CTLINT);

	/* Clear DONE and ERROR interrupts */
	hdmi_writeb(hdmi, HDMI_IH_I2CM_STAT0_ERROR | HDMI_IH_I2CM_STAT0_DONE,
		    HDMI_IH_I2CM_STAT0);

	/* Mute DONE and ERROR interrupts */
	hdmi_writeb(hdmi, HDMI_IH_I2CM_STAT0_ERROR | HDMI_IH_I2CM_STAT0_DONE,
		    HDMI_IH_MUTE_I2CM_STAT0);
}

static int dw_hdmi_i2c_read(struct dw_hdmi *hdmi,
			    unsigned char *buf, unsigned int length)
{
	struct dw_hdmi_i2c *i2c = hdmi->i2c;
	int stat;

	if (!i2c->is_regaddr) {
		dev_dbg(hdmi->dev, "set read register address to 0\n");
		i2c->slave_reg = 0x00;
		i2c->is_regaddr = true;
	}

	while (length--) {
		reinit_completion(&i2c->cmp);

		hdmi_writeb(hdmi, i2c->slave_reg++, HDMI_I2CM_ADDRESS);
		hdmi_writeb(hdmi, HDMI_I2CM_OPERATION_READ,
			    HDMI_I2CM_OPERATION);

		stat = wait_for_completion_timeout(&i2c->cmp, HZ / 10);
		if (!stat)
			return -EAGAIN;

		/* Check for error condition on the bus */
		if (i2c->stat & HDMI_IH_I2CM_STAT0_ERROR)
			return -EIO;

		*buf++ = hdmi_readb(hdmi, HDMI_I2CM_DATAI);
	}

	return 0;
}

static int dw_hdmi_i2c_write(struct dw_hdmi *hdmi,
			     unsigned char *buf, unsigned int length)
{
	struct dw_hdmi_i2c *i2c = hdmi->i2c;
	int stat;

	if (!i2c->is_regaddr) {
		/* Use the first write byte as register address */
		i2c->slave_reg = buf[0];
		length--;
		buf++;
		i2c->is_regaddr = true;
	}

	while (length--) {
		reinit_completion(&i2c->cmp);

		hdmi_writeb(hdmi, *buf++, HDMI_I2CM_DATAO);
		hdmi_writeb(hdmi, i2c->slave_reg++, HDMI_I2CM_ADDRESS);
		hdmi_writeb(hdmi, HDMI_I2CM_OPERATION_WRITE,
			    HDMI_I2CM_OPERATION);

		stat = wait_for_completion_timeout(&i2c->cmp, HZ / 10);
		if (!stat)
			return -EAGAIN;

		/* Check for error condition on the bus */
		if (i2c->stat & HDMI_IH_I2CM_STAT0_ERROR)
			return -EIO;
	}

	return 0;
}

static int dw_hdmi_i2c_xfer(struct i2c_adapter *adap,
			    struct i2c_msg *msgs, int num)
{
	struct dw_hdmi *hdmi = i2c_get_adapdata(adap);
	struct dw_hdmi_i2c *i2c = hdmi->i2c;
	u8 addr = msgs[0].addr;
	int i, ret = 0;

	dev_dbg(hdmi->dev, "xfer: num: %d, addr: %#x\n", num, addr);

	for (i = 0; i < num; i++) {
		if (msgs[i].addr != addr) {
			dev_warn(hdmi->dev,
				 "unsupported transfer, changed slave address\n");
			return -EOPNOTSUPP;
		}

		if (msgs[i].len == 0) {
			dev_dbg(hdmi->dev,
				"unsupported transfer %d/%d, no data\n",
				i + 1, num);
			return -EOPNOTSUPP;
		}
	}

	mutex_lock(&i2c->lock);

	/* Unmute DONE and ERROR interrupts */
	hdmi_writeb(hdmi, 0x00, HDMI_IH_MUTE_I2CM_STAT0);

	/* Set slave device address taken from the first I2C message */
	hdmi_writeb(hdmi, addr, HDMI_I2CM_SLAVE);

	/* Set slave device register address on transfer */
	i2c->is_regaddr = false;

	for (i = 0; i < num; i++) {
		dev_dbg(hdmi->dev, "xfer: num: %d/%d, len: %d, flags: %#x\n",
			i + 1, num, msgs[i].len, msgs[i].flags);

		if (msgs[i].flags & I2C_M_RD)
			ret = dw_hdmi_i2c_read(hdmi, msgs[i].buf, msgs[i].len);
		else
			ret = dw_hdmi_i2c_write(hdmi, msgs[i].buf, msgs[i].len);

		if (ret < 0)
			break;
	}

	if (!ret)
		ret = num;

	/* Mute DONE and ERROR interrupts */
	hdmi_writeb(hdmi, HDMI_IH_I2CM_STAT0_ERROR | HDMI_IH_I2CM_STAT0_DONE,
		    HDMI_IH_MUTE_I2CM_STAT0);

	mutex_unlock(&i2c->lock);

	return ret;
}

static u32 dw_hdmi_i2c_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}

static const struct i2c_algorithm dw_hdmi_algorithm = {
	.master_xfer	= dw_hdmi_i2c_xfer,
	.functionality	= dw_hdmi_i2c_func,
};

static struct i2c_adapter *dw_hdmi_i2c_adapter(struct dw_hdmi *hdmi)
{
	struct i2c_adapter *adap;
	struct dw_hdmi_i2c *i2c;
	int ret;

	i2c = devm_kzalloc(hdmi->dev, sizeof(*i2c), GFP_KERNEL);
	if (!i2c)
		return ERR_PTR(-ENOMEM);

	mutex_init(&i2c->lock);
	init_completion(&i2c->cmp);

	adap = &i2c->adap;
	adap->class = I2C_CLASS_DDC;
	adap->owner = THIS_MODULE;
	adap->dev.parent = hdmi->dev;
	adap->algo = &dw_hdmi_algorithm;
	strlcpy(adap->name, "DesignWare HDMI", sizeof(adap->name));
	i2c_set_adapdata(adap, hdmi);

	ret = i2c_add_adapter(adap);
	if (ret) {
		dev_warn(hdmi->dev, "cannot add %s I2C adapter\n", adap->name);
		devm_kfree(hdmi->dev, i2c);
		return ERR_PTR(ret);
	}

	hdmi->i2c = i2c;

	dev_info(hdmi->dev, "registered %s I2C bus driver\n", adap->name);

	return adap;
}

static void hdmi_set_cts_n(struct dw_hdmi *hdmi, unsigned int cts,
			   unsigned int n)
{
	/* Must be set/cleared first */
	hdmi_modb(hdmi, 0, HDMI_AUD_CTS3_CTS_MANUAL, HDMI_AUD_CTS3);

	/* nshift factor = 0 */
	hdmi_modb(hdmi, 0, HDMI_AUD_CTS3_N_SHIFT_MASK, HDMI_AUD_CTS3);

	hdmi_writeb(hdmi, ((cts >> 16) & HDMI_AUD_CTS3_AUDCTS19_16_MASK) |
		    HDMI_AUD_CTS3_CTS_MANUAL, HDMI_AUD_CTS3);
	hdmi_writeb(hdmi, (cts >> 8) & 0xff, HDMI_AUD_CTS2);
	hdmi_writeb(hdmi, cts & 0xff, HDMI_AUD_CTS1);

	hdmi_writeb(hdmi, (n >> 16) & 0x0f, HDMI_AUD_N3);
	hdmi_writeb(hdmi, (n >> 8) & 0xff, HDMI_AUD_N2);
	hdmi_writeb(hdmi, n & 0xff, HDMI_AUD_N1);
}

static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
{
	unsigned int n = (128 * freq) / 1000;
	unsigned int mult = 1;

	while (freq > 48000) {
		mult *= 2;
		freq /= 2;
	}

	switch (freq) {
	case 32000:
		if (pixel_clk == 25175000)
			n = 4576;
		else if (pixel_clk == 27027000)
			n = 4096;
		else if (pixel_clk == 74176000 || pixel_clk == 148352000)
			n = 11648;
		else
			n = 4096;
		n *= mult;
		break;

	case 44100:
		if (pixel_clk == 25175000)
			n = 7007;
		else if (pixel_clk == 74176000)
			n = 17836;
		else if (pixel_clk == 148352000)
			n = 8918;
		else
			n = 6272;
		n *= mult;
		break;

	case 48000:
		if (pixel_clk == 25175000)
			n = 6864;
		else if (pixel_clk == 27027000)
			n = 6144;
		else if (pixel_clk == 74176000)
			n = 11648;
		else if (pixel_clk == 148352000)
			n = 5824;
		else
			n = 6144;
		n *= mult;
		break;

	default:
		break;
	}

	return n;
}

static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
	unsigned long pixel_clk, unsigned int sample_rate)
{
	unsigned long ftdms = pixel_clk;
	unsigned int n, cts;
	u64 tmp;

	n = hdmi_compute_n(sample_rate, pixel_clk);

	/*
	 * Compute the CTS value from the N value.  Note that CTS and N
	 * can be up to 20 bits in total, so we need 64-bit math.  Also
	 * note that our TDMS clock is not fully accurate; it is accurate
	 * to kHz.  This can introduce an unnecessary remainder in the
	 * calculation below, so we don't try to warn about that.
	 */
	tmp = (u64)ftdms * n;
	do_div(tmp, 128 * sample_rate);
	cts = tmp;

	dev_dbg(hdmi->dev, "%s: fs=%uHz ftdms=%lu.%03luMHz N=%d cts=%d\n",
		__func__, sample_rate, ftdms / 1000000, (ftdms / 1000) % 1000,
		n, cts);

	spin_lock_irq(&hdmi->audio_lock);
	hdmi->audio_n = n;
	hdmi->audio_cts = cts;
	hdmi_set_cts_n(hdmi, cts, hdmi->audio_enable ? n : 0);
	spin_unlock_irq(&hdmi->audio_lock);
}

static void hdmi_init_clk_regenerator(struct dw_hdmi *hdmi)
{
	mutex_lock(&hdmi->audio_mutex);
	hdmi_set_clk_regenerator(hdmi, 74250000, hdmi->sample_rate);
	mutex_unlock(&hdmi->audio_mutex);
}

static void hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
{
	mutex_lock(&hdmi->audio_mutex);
	hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock,
				 hdmi->sample_rate);
	mutex_unlock(&hdmi->audio_mutex);
}

void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
{
	mutex_lock(&hdmi->audio_mutex);
	hdmi->sample_rate = rate;
	hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock,
				 hdmi->sample_rate);
	mutex_unlock(&hdmi->audio_mutex);
}
EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_rate);

void dw_hdmi_audio_enable(struct dw_hdmi *hdmi)
{
	unsigned long flags;

	spin_lock_irqsave(&hdmi->audio_lock, flags);
	hdmi->audio_enable = true;
	hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
	spin_unlock_irqrestore(&hdmi->audio_lock, flags);
}
EXPORT_SYMBOL_GPL(dw_hdmi_audio_enable);

void dw_hdmi_audio_disable(struct dw_hdmi *hdmi)
{
	unsigned long flags;

	spin_lock_irqsave(&hdmi->audio_lock, flags);
	hdmi->audio_enable = false;
	hdmi_set_cts_n(hdmi, hdmi->audio_cts, 0);
	spin_unlock_irqrestore(&hdmi->audio_lock, flags);
}
EXPORT_SYMBOL_GPL(dw_hdmi_audio_disable);

/*
 * this submodule is responsible for the video data synchronization.
 * for example, for RGB 4:4:4 input, the data map is defined as
 *			pin{47~40} <==> R[7:0]
 *			pin{31~24} <==> G[7:0]
 *			pin{15~8}  <==> B[7:0]
 */
static void hdmi_video_sample(struct dw_hdmi *hdmi)
{
	int color_format = 0;
	u8 val;

	if (hdmi->hdmi_data.enc_in_format == RGB) {
		if (hdmi->hdmi_data.enc_color_depth == 8)
			color_format = 0x01;
		else if (hdmi->hdmi_data.enc_color_depth == 10)
			color_format = 0x03;
		else if (hdmi->hdmi_data.enc_color_depth == 12)
			color_format = 0x05;
		else if (hdmi->hdmi_data.enc_color_depth == 16)
			color_format = 0x07;
		else
			return;
	} else if (hdmi->hdmi_data.enc_in_format == YCBCR444) {
		if (hdmi->hdmi_data.enc_color_depth == 8)
			color_format = 0x09;
		else if (hdmi->hdmi_data.enc_color_depth == 10)
			color_format = 0x0B;
		else if (hdmi->hdmi_data.enc_color_depth == 12)
			color_format = 0x0D;
		else if (hdmi->hdmi_data.enc_color_depth == 16)
			color_format = 0x0F;
		else
			return;
	} else if (hdmi->hdmi_data.enc_in_format == YCBCR422_8BITS) {
		if (hdmi->hdmi_data.enc_color_depth == 8)
			color_format = 0x16;
		else if (hdmi->hdmi_data.enc_color_depth == 10)
			color_format = 0x14;
		else if (hdmi->hdmi_data.enc_color_depth == 12)
			color_format = 0x12;
		else
			return;
	}

	val = HDMI_TX_INVID0_INTERNAL_DE_GENERATOR_DISABLE |
		((color_format << HDMI_TX_INVID0_VIDEO_MAPPING_OFFSET) &
		HDMI_TX_INVID0_VIDEO_MAPPING_MASK);
	hdmi_writeb(hdmi, val, HDMI_TX_INVID0);

	/* Enable TX stuffing: When DE is inactive, fix the output data to 0 */
	val = HDMI_TX_INSTUFFING_BDBDATA_STUFFING_ENABLE |
		HDMI_TX_INSTUFFING_RCRDATA_STUFFING_ENABLE |
		HDMI_TX_INSTUFFING_GYDATA_STUFFING_ENABLE;
	hdmi_writeb(hdmi, val, HDMI_TX_INSTUFFING);
	hdmi_writeb(hdmi, 0x0, HDMI_TX_GYDATA0);
	hdmi_writeb(hdmi, 0x0, HDMI_TX_GYDATA1);
	hdmi_writeb(hdmi, 0x0, HDMI_TX_RCRDATA0);
	hdmi_writeb(hdmi, 0x0, HDMI_TX_RCRDATA1);
	hdmi_writeb(hdmi, 0x0, HDMI_TX_BCBDATA0);
	hdmi_writeb(hdmi, 0x0, HDMI_TX_BCBDATA1);
}

static int is_color_space_conversion(struct dw_hdmi *hdmi)
{
	return hdmi->hdmi_data.enc_in_format != hdmi->hdmi_data.enc_out_format;
}

static int is_color_space_decimation(struct dw_hdmi *hdmi)
{
	if (hdmi->hdmi_data.enc_out_format != YCBCR422_8BITS)
		return 0;
	if (hdmi->hdmi_data.enc_in_format == RGB ||
	    hdmi->hdmi_data.enc_in_format == YCBCR444)
		return 1;
	return 0;
}

static int is_color_space_interpolation(struct dw_hdmi *hdmi)
{
	if (hdmi->hdmi_data.enc_in_format != YCBCR422_8BITS)
		return 0;
	if (hdmi->hdmi_data.enc_out_format == RGB ||
	    hdmi->hdmi_data.enc_out_format == YCBCR444)
		return 1;
	return 0;
}

static void dw_hdmi_update_csc_coeffs(struct dw_hdmi *hdmi)
{
	const u16 (*csc_coeff)[3][4] = &csc_coeff_default;
	unsigned i;
	u32 csc_scale = 1;

	if (is_color_space_conversion(hdmi)) {
		if (hdmi->hdmi_data.enc_out_format == RGB) {
			if (hdmi->hdmi_data.colorimetry ==
					HDMI_COLORIMETRY_ITU_601)
				csc_coeff = &csc_coeff_rgb_out_eitu601;
			else
				csc_coeff = &csc_coeff_rgb_out_eitu709;
		} else if (hdmi->hdmi_data.enc_in_format == RGB) {
			if (hdmi->hdmi_data.colorimetry ==
					HDMI_COLORIMETRY_ITU_601)
				csc_coeff = &csc_coeff_rgb_in_eitu601;
			else
				csc_coeff = &csc_coeff_rgb_in_eitu709;
			csc_scale = 0;
		}
	}

	/* The CSC registers are sequential, alternating MSB then LSB */
	for (i = 0; i < ARRAY_SIZE(csc_coeff_default[0]); i++) {
		u16 coeff_a = (*csc_coeff)[0][i];
		u16 coeff_b = (*csc_coeff)[1][i];
		u16 coeff_c = (*csc_coeff)[2][i];

		hdmi_writeb(hdmi, coeff_a & 0xff, HDMI_CSC_COEF_A1_LSB + i * 2);
		hdmi_writeb(hdmi, coeff_a >> 8, HDMI_CSC_COEF_A1_MSB + i * 2);
		hdmi_writeb(hdmi, coeff_b & 0xff, HDMI_CSC_COEF_B1_LSB + i * 2);
		hdmi_writeb(hdmi, coeff_b >> 8, HDMI_CSC_COEF_B1_MSB + i * 2);
		hdmi_writeb(hdmi, coeff_c & 0xff, HDMI_CSC_COEF_C1_LSB + i * 2);
		hdmi_writeb(hdmi, coeff_c >> 8, HDMI_CSC_COEF_C1_MSB + i * 2);
	}

	hdmi_modb(hdmi, csc_scale, HDMI_CSC_SCALE_CSCSCALE_MASK,
		  HDMI_CSC_SCALE);
}

static void hdmi_video_csc(struct dw_hdmi *hdmi)
{
	int color_depth = 0;
	int interpolation = HDMI_CSC_CFG_INTMODE_DISABLE;
	int decimation = 0;

	/* YCC422 interpolation to 444 mode */
	if (is_color_space_interpolation(hdmi))
		interpolation = HDMI_CSC_CFG_INTMODE_CHROMA_INT_FORMULA1;
	else if (is_color_space_decimation(hdmi))
		decimation = HDMI_CSC_CFG_DECMODE_CHROMA_INT_FORMULA3;

	if (hdmi->hdmi_data.enc_color_depth == 8)
		color_depth = HDMI_CSC_SCALE_CSC_COLORDE_PTH_24BPP;
	else if (hdmi->hdmi_data.enc_color_depth == 10)
		color_depth = HDMI_CSC_SCALE_CSC_COLORDE_PTH_30BPP;
	else if (hdmi->hdmi_data.enc_color_depth == 12)
		color_depth = HDMI_CSC_SCALE_CSC_COLORDE_PTH_36BPP;
	else if (hdmi->hdmi_data.enc_color_depth == 16)
		color_depth = HDMI_CSC_SCALE_CSC_COLORDE_PTH_48BPP;
	else
		return;

	/* Configure the CSC registers */
	hdmi_writeb(hdmi, interpolation | decimation, HDMI_CSC_CFG);
	hdmi_modb(hdmi, color_depth, HDMI_CSC_SCALE_CSC_COLORDE_PTH_MASK,
		  HDMI_CSC_SCALE);

	dw_hdmi_update_csc_coeffs(hdmi);
}

/*
 * HDMI video packetizer is used to packetize the data.
 * for example, if input is YCC422 mode or repeater is used,
 * data should be repacked this module can be bypassed.
 */
static void hdmi_video_packetize(struct dw_hdmi *hdmi)
{
	unsigned int color_depth = 0;
	unsigned int remap_size = HDMI_VP_REMAP_YCC422_16bit;
	unsigned int output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_PP;
	struct hdmi_data_info *hdmi_data = &hdmi->hdmi_data;
	u8 val, vp_conf;

	if (hdmi_data->enc_out_format == RGB ||
	    hdmi_data->enc_out_format == YCBCR444) {
		if (!hdmi_data->enc_color_depth) {
			output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_BYPASS;
		} else if (hdmi_data->enc_color_depth == 8) {
			color_depth = 4;
			output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_BYPASS;
		} else if (hdmi_data->enc_color_depth == 10) {
			color_depth = 5;
		} else if (hdmi_data->enc_color_depth == 12) {
			color_depth = 6;
		} else if (hdmi_data->enc_color_depth == 16) {
			color_depth = 7;
		} else {
			return;
		}
	} else if (hdmi_data->enc_out_format == YCBCR422_8BITS) {
		if (!hdmi_data->enc_color_depth ||
		    hdmi_data->enc_color_depth == 8)
			remap_size = HDMI_VP_REMAP_YCC422_16bit;
		else if (hdmi_data->enc_color_depth == 10)
			remap_size = HDMI_VP_REMAP_YCC422_20bit;
		else if (hdmi_data->enc_color_depth == 12)
			remap_size = HDMI_VP_REMAP_YCC422_24bit;
		else
			return;
		output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_YCC422;
	} else {
		return;
	}

	/* set the packetizer registers */
	val = ((color_depth << HDMI_VP_PR_CD_COLOR_DEPTH_OFFSET) &
		HDMI_VP_PR_CD_COLOR_DEPTH_MASK) |
		((hdmi_data->pix_repet_factor <<
		HDMI_VP_PR_CD_DESIRED_PR_FACTOR_OFFSET) &
		HDMI_VP_PR_CD_DESIRED_PR_FACTOR_MASK);
	hdmi_writeb(hdmi, val, HDMI_VP_PR_CD);

	hdmi_modb(hdmi, HDMI_VP_STUFF_PR_STUFFING_STUFFING_MODE,
		  HDMI_VP_STUFF_PR_STUFFING_MASK, HDMI_VP_STUFF);

	/* Data from pixel repeater block */
	if (hdmi_data->pix_repet_factor > 1) {
		vp_conf = HDMI_VP_CONF_PR_EN_ENABLE |
			  HDMI_VP_CONF_BYPASS_SELECT_PIX_REPEATER;
	} else { /* data from packetizer block */
		vp_conf = HDMI_VP_CONF_PR_EN_DISABLE |
			  HDMI_VP_CONF_BYPASS_SELECT_VID_PACKETIZER;
	}

	hdmi_modb(hdmi, vp_conf,
		  HDMI_VP_CONF_PR_EN_MASK |
		  HDMI_VP_CONF_BYPASS_SELECT_MASK, HDMI_VP_CONF);

	hdmi_modb(hdmi, 1 << HDMI_VP_STUFF_IDEFAULT_PHASE_OFFSET,
		  HDMI_VP_STUFF_IDEFAULT_PHASE_MASK, HDMI_VP_STUFF);

	hdmi_writeb(hdmi, remap_size, HDMI_VP_REMAP);

	if (output_select == HDMI_VP_CONF_OUTPUT_SELECTOR_PP) {
		vp_conf = HDMI_VP_CONF_BYPASS_EN_DISABLE |
			  HDMI_VP_CONF_PP_EN_ENABLE |
			  HDMI_VP_CONF_YCC422_EN_DISABLE;
	} else if (output_select == HDMI_VP_CONF_OUTPUT_SELECTOR_YCC422) {
		vp_conf = HDMI_VP_CONF_BYPASS_EN_DISABLE |
			  HDMI_VP_CONF_PP_EN_DISABLE |
			  HDMI_VP_CONF_YCC422_EN_ENABLE;
	} else if (output_select == HDMI_VP_CONF_OUTPUT_SELECTOR_BYPASS) {
		vp_conf = HDMI_VP_CONF_BYPASS_EN_ENABLE |
			  HDMI_VP_CONF_PP_EN_DISABLE |
			  HDMI_VP_CONF_YCC422_EN_DISABLE;
	} else {
		return;
	}

	hdmi_modb(hdmi, vp_conf,
		  HDMI_VP_CONF_BYPASS_EN_MASK | HDMI_VP_CONF_PP_EN_ENMASK |
		  HDMI_VP_CONF_YCC422_EN_MASK, HDMI_VP_CONF);

	hdmi_modb(hdmi, HDMI_VP_STUFF_PP_STUFFING_STUFFING_MODE |
			HDMI_VP_STUFF_YCC422_STUFFING_STUFFING_MODE,
		  HDMI_VP_STUFF_PP_STUFFING_MASK |
		  HDMI_VP_STUFF_YCC422_STUFFING_MASK, HDMI_VP_STUFF);

	hdmi_modb(hdmi, output_select, HDMI_VP_CONF_OUTPUT_SELECTOR_MASK,
		  HDMI_VP_CONF);
}

static inline void hdmi_phy_test_clear(struct dw_hdmi *hdmi,
				       unsigned char bit)
{
	hdmi_modb(hdmi, bit << HDMI_PHY_TST0_TSTCLR_OFFSET,
		  HDMI_PHY_TST0_TSTCLR_MASK, HDMI_PHY_TST0);
}

static inline void hdmi_phy_test_enable(struct dw_hdmi *hdmi,
					unsigned char bit)
{
	hdmi_modb(hdmi, bit << HDMI_PHY_TST0_TSTEN_OFFSET,
		  HDMI_PHY_TST0_TSTEN_MASK, HDMI_PHY_TST0);
}

static inline void hdmi_phy_test_clock(struct dw_hdmi *hdmi,
				       unsigned char bit)
{
	hdmi_modb(hdmi, bit << HDMI_PHY_TST0_TSTCLK_OFFSET,
		  HDMI_PHY_TST0_TSTCLK_MASK, HDMI_PHY_TST0);
}

static inline void hdmi_phy_test_din(struct dw_hdmi *hdmi,
				     unsigned char bit)
{
	hdmi_writeb(hdmi, bit, HDMI_PHY_TST1);
}

static inline void hdmi_phy_test_dout(struct dw_hdmi *hdmi,
				      unsigned char bit)
{
	hdmi_writeb(hdmi, bit, HDMI_PHY_TST2);
}

static bool hdmi_phy_wait_i2c_done(struct dw_hdmi *hdmi, int msec)
{
	u32 val;

	while ((val = hdmi_readb(hdmi, HDMI_IH_I2CMPHY_STAT0) & 0x3) == 0) {
		if (msec-- == 0)
			return false;
		udelay(1000);
	}
	hdmi_writeb(hdmi, val, HDMI_IH_I2CMPHY_STAT0);

	return true;
}

static void hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
				 unsigned char addr)
{
	hdmi_writeb(hdmi, 0xFF, HDMI_IH_I2CMPHY_STAT0);
	hdmi_writeb(hdmi, addr, HDMI_PHY_I2CM_ADDRESS_ADDR);
	hdmi_writeb(hdmi, (unsigned char)(data >> 8),
		    HDMI_PHY_I2CM_DATAO_1_ADDR);
	hdmi_writeb(hdmi, (unsigned char)(data >> 0),
		    HDMI_PHY_I2CM_DATAO_0_ADDR);
	hdmi_writeb(hdmi, HDMI_PHY_I2CM_OPERATION_ADDR_WRITE,
		    HDMI_PHY_I2CM_OPERATION_ADDR);
	hdmi_phy_wait_i2c_done(hdmi, 1000);
}

static void dw_hdmi_phy_enable_powerdown(struct dw_hdmi *hdmi, bool enable)
{
	hdmi_mask_writeb(hdmi, !enable, HDMI_PHY_CONF0,
			 HDMI_PHY_CONF0_PDZ_OFFSET,
			 HDMI_PHY_CONF0_PDZ_MASK);
}

static void dw_hdmi_phy_enable_tmds(struct dw_hdmi *hdmi, u8 enable)
{
	hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
			 HDMI_PHY_CONF0_ENTMDS_OFFSET,
			 HDMI_PHY_CONF0_ENTMDS_MASK);
}

static void dw_hdmi_phy_enable_spare(struct dw_hdmi *hdmi, u8 enable)
{
	hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
			 HDMI_PHY_CONF0_SPARECTRL_OFFSET,
			 HDMI_PHY_CONF0_SPARECTRL_MASK);
}

static void dw_hdmi_phy_gen2_pddq(struct dw_hdmi *hdmi, u8 enable)
{
	hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
			 HDMI_PHY_CONF0_GEN2_PDDQ_OFFSET,
			 HDMI_PHY_CONF0_GEN2_PDDQ_MASK);
}

static void dw_hdmi_phy_gen2_txpwron(struct dw_hdmi *hdmi, u8 enable)
{
	hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
			 HDMI_PHY_CONF0_GEN2_TXPWRON_OFFSET,
			 HDMI_PHY_CONF0_GEN2_TXPWRON_MASK);
}

static void dw_hdmi_phy_sel_data_en_pol(struct dw_hdmi *hdmi, u8 enable)
{
	hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
			 HDMI_PHY_CONF0_SELDATAENPOL_OFFSET,
			 HDMI_PHY_CONF0_SELDATAENPOL_MASK);
}

static void dw_hdmi_phy_sel_interface_control(struct dw_hdmi *hdmi, u8 enable)
{
	hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
			 HDMI_PHY_CONF0_SELDIPIF_OFFSET,
			 HDMI_PHY_CONF0_SELDIPIF_MASK);
}

static int hdmi_phy_configure(struct dw_hdmi *hdmi,
			      unsigned char res, int cscon)
{
	unsigned res_idx;
	u8 val, msec;
	const struct dw_hdmi_plat_data *pdata = hdmi->plat_data;
	const struct dw_hdmi_mpll_config *mpll_config = pdata->mpll_cfg;
	const struct dw_hdmi_curr_ctrl *curr_ctrl = pdata->cur_ctr;
	const struct dw_hdmi_phy_config *phy_config = pdata->phy_config;

	switch (res) {
	case 0:	/* color resolution 0 is 8 bit colour depth */
	case 8:
		res_idx = DW_HDMI_RES_8;
		break;
	case 10:
		res_idx = DW_HDMI_RES_10;
		break;
	case 12:
		res_idx = DW_HDMI_RES_12;
		break;
	default:
		return -EINVAL;
	}

	/* PLL/MPLL Cfg - always match on final entry */
	for (; mpll_config->mpixelclock != ~0UL; mpll_config++)
		if (hdmi->hdmi_data.video_mode.mpixelclock <=
		    mpll_config->mpixelclock)
			break;

	for (; curr_ctrl->mpixelclock != ~0UL; curr_ctrl++)
		if (hdmi->hdmi_data.video_mode.mpixelclock <=
		    curr_ctrl->mpixelclock)
			break;

	for (; phy_config->mpixelclock != ~0UL; phy_config++)
		if (hdmi->hdmi_data.video_mode.mpixelclock <=
		    phy_config->mpixelclock)
			break;

	if (mpll_config->mpixelclock == ~0UL ||
	    curr_ctrl->mpixelclock == ~0UL ||
	    phy_config->mpixelclock == ~0UL) {
		dev_err(hdmi->dev, "Pixel clock %d - unsupported by HDMI\n",
			hdmi->hdmi_data.video_mode.mpixelclock);
		return -EINVAL;
	}

	/* Enable csc path */
	if (cscon)
		val = HDMI_MC_FLOWCTRL_FEED_THROUGH_OFF_CSC_IN_PATH;
	else
		val = HDMI_MC_FLOWCTRL_FEED_THROUGH_OFF_CSC_BYPASS;

	hdmi_writeb(hdmi, val, HDMI_MC_FLOWCTRL);

	/* gen2 tx power off */
	dw_hdmi_phy_gen2_txpwron(hdmi, 0);

	/* gen2 pddq */
	dw_hdmi_phy_gen2_pddq(hdmi, 1);

	/* PHY reset */
	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_DEASSERT, HDMI_MC_PHYRSTZ);
	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_ASSERT, HDMI_MC_PHYRSTZ);

	hdmi_writeb(hdmi, HDMI_MC_HEACPHY_RST_ASSERT, HDMI_MC_HEACPHY_RST);

	hdmi_phy_test_clear(hdmi, 1);
	hdmi_writeb(hdmi, HDMI_PHY_I2CM_SLAVE_ADDR_PHY_GEN2,
		    HDMI_PHY_I2CM_SLAVE_ADDR);
	hdmi_phy_test_clear(hdmi, 0);

	hdmi_phy_i2c_write(hdmi, mpll_config->res[res_idx].cpce, 0x06);
	hdmi_phy_i2c_write(hdmi, mpll_config->res[res_idx].gmp, 0x15);

	/* CURRCTRL */
	hdmi_phy_i2c_write(hdmi, curr_ctrl->curr[res_idx], 0x10);

	hdmi_phy_i2c_write(hdmi, 0x0000, 0x13);  /* PLLPHBYCTRL */
	hdmi_phy_i2c_write(hdmi, 0x0006, 0x17);

	hdmi_phy_i2c_write(hdmi, phy_config->term, 0x19);  /* TXTERM */
	hdmi_phy_i2c_write(hdmi, phy_config->sym_ctr, 0x09); /* CKSYMTXCTRL */
	hdmi_phy_i2c_write(hdmi, phy_config->vlev_ctr, 0x0E); /* VLEVCTRL */

	/* REMOVE CLK TERM */
	hdmi_phy_i2c_write(hdmi, 0x8000, 0x05);  /* CKCALCTRL */

	dw_hdmi_phy_enable_powerdown(hdmi, false);

	/* toggle TMDS enable */
	dw_hdmi_phy_enable_tmds(hdmi, 0);
	dw_hdmi_phy_enable_tmds(hdmi, 1);

	/* gen2 tx power on */
	dw_hdmi_phy_gen2_txpwron(hdmi, 1);
	dw_hdmi_phy_gen2_pddq(hdmi, 0);

	if (hdmi->dev_type == RK3288_HDMI)
		dw_hdmi_phy_enable_spare(hdmi, 1);

	/*Wait for PHY PLL lock */
	msec = 5;
	do {
		val = hdmi_readb(hdmi, HDMI_PHY_STAT0) & HDMI_PHY_TX_PHY_LOCK;
		if (!val)
			break;

		if (msec == 0) {
			dev_err(hdmi->dev, "PHY PLL not locked\n");
			return -ETIMEDOUT;
		}

		udelay(1000);
		msec--;
	} while (1);

	return 0;
}

static int dw_hdmi_phy_init(struct dw_hdmi *hdmi)
{
	int i, ret;
	bool cscon;

	/*check csc whether needed activated in HDMI mode */
	cscon = hdmi->sink_is_hdmi && is_color_space_conversion(hdmi);

	/* HDMI Phy spec says to do the phy initialization sequence twice */
	for (i = 0; i < 2; i++) {
		dw_hdmi_phy_sel_data_en_pol(hdmi, 1);
		dw_hdmi_phy_sel_interface_control(hdmi, 0);
		dw_hdmi_phy_enable_tmds(hdmi, 0);
		dw_hdmi_phy_enable_powerdown(hdmi, true);

		/* Enable CSC */
		ret = hdmi_phy_configure(hdmi, 8, cscon);
		if (ret)
			return ret;
	}

	hdmi->phy_enabled = true;
	return 0;
}

static void hdmi_tx_hdcp_config(struct dw_hdmi *hdmi)
{
	u8 de;

	if (hdmi->hdmi_data.video_mode.mdataenablepolarity)
		de = HDMI_A_VIDPOLCFG_DATAENPOL_ACTIVE_HIGH;
	else
		de = HDMI_A_VIDPOLCFG_DATAENPOL_ACTIVE_LOW;

	/* disable rx detect */
	hdmi_modb(hdmi, HDMI_A_HDCPCFG0_RXDETECT_DISABLE,
		  HDMI_A_HDCPCFG0_RXDETECT_MASK, HDMI_A_HDCPCFG0);

	hdmi_modb(hdmi, de, HDMI_A_VIDPOLCFG_DATAENPOL_MASK, HDMI_A_VIDPOLCFG);

	hdmi_modb(hdmi, HDMI_A_HDCPCFG1_ENCRYPTIONDISABLE_DISABLE,
		  HDMI_A_HDCPCFG1_ENCRYPTIONDISABLE_MASK, HDMI_A_HDCPCFG1);
}

static void hdmi_config_AVI(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
{
	struct hdmi_avi_infoframe frame;
	u8 val;

	/* Initialise info frame from DRM mode */
	drm_hdmi_avi_infoframe_from_display_mode(&frame, mode);

	if (hdmi->hdmi_data.enc_out_format == YCBCR444)
		frame.colorspace = HDMI_COLORSPACE_YUV444;
	else if (hdmi->hdmi_data.enc_out_format == YCBCR422_8BITS)
		frame.colorspace = HDMI_COLORSPACE_YUV422;
	else
		frame.colorspace = HDMI_COLORSPACE_RGB;

	/* Set up colorimetry */
	if (hdmi->hdmi_data.enc_out_format == XVYCC444) {
		frame.colorimetry = HDMI_COLORIMETRY_EXTENDED;
		if (hdmi->hdmi_data.colorimetry == HDMI_COLORIMETRY_ITU_601)
			frame.extended_colorimetry =
				HDMI_EXTENDED_COLORIMETRY_XV_YCC_601;
		else /*hdmi->hdmi_data.colorimetry == HDMI_COLORIMETRY_ITU_709*/
			frame.extended_colorimetry =
				HDMI_EXTENDED_COLORIMETRY_XV_YCC_709;
	} else if (hdmi->hdmi_data.enc_out_format != RGB) {
		frame.colorimetry = hdmi->hdmi_data.colorimetry;
		frame.extended_colorimetry = HDMI_EXTENDED_COLORIMETRY_XV_YCC_601;
	} else { /* Carries no data */
		frame.colorimetry = HDMI_COLORIMETRY_NONE;
		frame.extended_colorimetry = HDMI_EXTENDED_COLORIMETRY_XV_YCC_601;
	}

	frame.scan_mode = HDMI_SCAN_MODE_NONE;

	/*
	 * The Designware IP uses a different byte format from standard
	 * AVI info frames, though generally the bits are in the correct
	 * bytes.
	 */

	/*
	 * AVI data byte 1 differences: Colorspace in bits 0,1 rather than 5,6,
	 * scan info in bits 4,5 rather than 0,1 and active aspect present in
	 * bit 6 rather than 4.
	 */
	val = (frame.scan_mode & 3) << 4 | (frame.colorspace & 3);
	if (frame.active_aspect & 15)
		val |= HDMI_FC_AVICONF0_ACTIVE_FMT_INFO_PRESENT;
	if (frame.top_bar || frame.bottom_bar)
		val |= HDMI_FC_AVICONF0_BAR_DATA_HORIZ_BAR;
	if (frame.left_bar || frame.right_bar)
		val |= HDMI_FC_AVICONF0_BAR_DATA_VERT_BAR;
	hdmi_writeb(hdmi, val, HDMI_FC_AVICONF0);

	/* AVI data byte 2 differences: none */
	val = ((frame.colorimetry & 0x3) << 6) |
	      ((frame.picture_aspect & 0x3) << 4) |
	      (frame.active_aspect & 0xf);
	hdmi_writeb(hdmi, val, HDMI_FC_AVICONF1);

	/* AVI data byte 3 differences: none */
	val = ((frame.extended_colorimetry & 0x7) << 4) |
	      ((frame.quantization_range & 0x3) << 2) |
	      (frame.nups & 0x3);
	if (frame.itc)
		val |= HDMI_FC_AVICONF2_IT_CONTENT_VALID;
	hdmi_writeb(hdmi, val, HDMI_FC_AVICONF2);

	/* AVI data byte 4 differences: none */
	val = frame.video_code & 0x7f;
	hdmi_writeb(hdmi, val, HDMI_FC_AVIVID);

	/* AVI Data Byte 5- set up input and output pixel repetition */
	val = (((hdmi->hdmi_data.video_mode.mpixelrepetitioninput + 1) <<
		HDMI_FC_PRCONF_INCOMING_PR_FACTOR_OFFSET) &
		HDMI_FC_PRCONF_INCOMING_PR_FACTOR_MASK) |
		((hdmi->hdmi_data.video_mode.mpixelrepetitionoutput <<
		HDMI_FC_PRCONF_OUTPUT_PR_FACTOR_OFFSET) &
		HDMI_FC_PRCONF_OUTPUT_PR_FACTOR_MASK);
	hdmi_writeb(hdmi, val, HDMI_FC_PRCONF);

	/*
	 * AVI data byte 5 differences: content type in 0,1 rather than 4,5,
	 * ycc range in bits 2,3 rather than 6,7
	 */
	val = ((frame.ycc_quantization_range & 0x3) << 2) |
	      (frame.content_type & 0x3);
	hdmi_writeb(hdmi, val, HDMI_FC_AVICONF3);

	/* AVI Data Bytes 6-13 */
	hdmi_writeb(hdmi, frame.top_bar & 0xff, HDMI_FC_AVIETB0);
	hdmi_writeb(hdmi, (frame.top_bar >> 8) & 0xff, HDMI_FC_AVIETB1);
	hdmi_writeb(hdmi, frame.bottom_bar & 0xff, HDMI_FC_AVISBB0);
	hdmi_writeb(hdmi, (frame.bottom_bar >> 8) & 0xff, HDMI_FC_AVISBB1);
	hdmi_writeb(hdmi, frame.left_bar & 0xff, HDMI_FC_AVIELB0);
	hdmi_writeb(hdmi, (frame.left_bar >> 8) & 0xff, HDMI_FC_AVIELB1);
	hdmi_writeb(hdmi, frame.right_bar & 0xff, HDMI_FC_AVISRB0);
	hdmi_writeb(hdmi, (frame.right_bar >> 8) & 0xff, HDMI_FC_AVISRB1);
}

static void hdmi_av_composer(struct dw_hdmi *hdmi,
			     const struct drm_display_mode *mode)
{
	u8 inv_val;
	struct hdmi_vmode *vmode = &hdmi->hdmi_data.video_mode;
	int hblank, vblank, h_de_hs, v_de_vs, hsync_len, vsync_len;
	unsigned int vdisplay;

	vmode->mpixelclock = mode->clock * 1000;

	dev_dbg(hdmi->dev, "final pixclk = %d\n", vmode->mpixelclock);

	/* Set up HDMI_FC_INVIDCONF */
	inv_val = (hdmi->hdmi_data.hdcp_enable ?
		HDMI_FC_INVIDCONF_HDCP_KEEPOUT_ACTIVE :
		HDMI_FC_INVIDCONF_HDCP_KEEPOUT_INACTIVE);

	inv_val |= mode->flags & DRM_MODE_FLAG_PVSYNC ?
		HDMI_FC_INVIDCONF_VSYNC_IN_POLARITY_ACTIVE_HIGH :
		HDMI_FC_INVIDCONF_VSYNC_IN_POLARITY_ACTIVE_LOW;

	inv_val |= mode->flags & DRM_MODE_FLAG_PHSYNC ?
		HDMI_FC_INVIDCONF_HSYNC_IN_POLARITY_ACTIVE_HIGH :
		HDMI_FC_INVIDCONF_HSYNC_IN_POLARITY_ACTIVE_LOW;

	inv_val |= (vmode->mdataenablepolarity ?
		HDMI_FC_INVIDCONF_DE_IN_POLARITY_ACTIVE_HIGH :
		HDMI_FC_INVIDCONF_DE_IN_POLARITY_ACTIVE_LOW);

	if (hdmi->vic == 39)
		inv_val |= HDMI_FC_INVIDCONF_R_V_BLANK_IN_OSC_ACTIVE_HIGH;
	else
		inv_val |= mode->flags & DRM_MODE_FLAG_INTERLACE ?
			HDMI_FC_INVIDCONF_R_V_BLANK_IN_OSC_ACTIVE_HIGH :
			HDMI_FC_INVIDCONF_R_V_BLANK_IN_OSC_ACTIVE_LOW;

	inv_val |= mode->flags & DRM_MODE_FLAG_INTERLACE ?
		HDMI_FC_INVIDCONF_IN_I_P_INTERLACED :
		HDMI_FC_INVIDCONF_IN_I_P_PROGRESSIVE;

	inv_val |= hdmi->sink_is_hdmi ?
		HDMI_FC_INVIDCONF_DVI_MODEZ_HDMI_MODE :
		HDMI_FC_INVIDCONF_DVI_MODEZ_DVI_MODE;

	hdmi_writeb(hdmi, inv_val, HDMI_FC_INVIDCONF);

	vdisplay = mode->vdisplay;
	vblank = mode->vtotal - mode->vdisplay;
	v_de_vs = mode->vsync_start - mode->vdisplay;
	vsync_len = mode->vsync_end - mode->vsync_start;

	/*
	 * When we're setting an interlaced mode, we need
	 * to adjust the vertical timing to suit.
	 */
	if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
		vdisplay /= 2;
		vblank /= 2;
		v_de_vs /= 2;
		vsync_len /= 2;
	}

	/* Set up horizontal active pixel width */
	hdmi_writeb(hdmi, mode->hdisplay >> 8, HDMI_FC_INHACTV1);
	hdmi_writeb(hdmi, mode->hdisplay, HDMI_FC_INHACTV0);

	/* Set up vertical active lines */
	hdmi_writeb(hdmi, vdisplay >> 8, HDMI_FC_INVACTV1);
	hdmi_writeb(hdmi, vdisplay, HDMI_FC_INVACTV0);

	/* Set up horizontal blanking pixel region width */
	hblank = mode->htotal - mode->hdisplay;
	hdmi_writeb(hdmi, hblank >> 8, HDMI_FC_INHBLANK1);
	hdmi_writeb(hdmi, hblank, HDMI_FC_INHBLANK0);

	/* Set up vertical blanking pixel region width */
	hdmi_writeb(hdmi, vblank, HDMI_FC_INVBLANK);

	/* Set up HSYNC active edge delay width (in pixel clks) */
	h_de_hs = mode->hsync_start - mode->hdisplay;
	hdmi_writeb(hdmi, h_de_hs >> 8, HDMI_FC_HSYNCINDELAY1);
	hdmi_writeb(hdmi, h_de_hs, HDMI_FC_HSYNCINDELAY0);

	/* Set up VSYNC active edge delay (in lines) */
	hdmi_writeb(hdmi, v_de_vs, HDMI_FC_VSYNCINDELAY);

	/* Set up HSYNC active pulse width (in pixel clks) */
	hsync_len = mode->hsync_end - mode->hsync_start;
	hdmi_writeb(hdmi, hsync_len >> 8, HDMI_FC_HSYNCINWIDTH1);
	hdmi_writeb(hdmi, hsync_len, HDMI_FC_HSYNCINWIDTH0);

	/* Set up VSYNC active edge delay (in lines) */
	hdmi_writeb(hdmi, vsync_len, HDMI_FC_VSYNCINWIDTH);
}

static void dw_hdmi_phy_disable(struct dw_hdmi *hdmi)
{
	if (!hdmi->phy_enabled)
		return;

	dw_hdmi_phy_enable_tmds(hdmi, 0);
	dw_hdmi_phy_enable_powerdown(hdmi, true);

	hdmi->phy_enabled = false;
}

/* HDMI Initialization Step B.4 */
static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi)
{
	u8 clkdis;

	/* control period minimum duration */
	hdmi_writeb(hdmi, 12, HDMI_FC_CTRLDUR);
	hdmi_writeb(hdmi, 32, HDMI_FC_EXCTRLDUR);
	hdmi_writeb(hdmi, 1, HDMI_FC_EXCTRLSPAC);

	/* Set to fill TMDS data channels */
	hdmi_writeb(hdmi, 0x0B, HDMI_FC_CH0PREAM);
	hdmi_writeb(hdmi, 0x16, HDMI_FC_CH1PREAM);
	hdmi_writeb(hdmi, 0x21, HDMI_FC_CH2PREAM);

	/* Enable pixel clock and tmds data path */
	clkdis = 0x7F;
	clkdis &= ~HDMI_MC_CLKDIS_PIXELCLK_DISABLE;
	hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS);

	clkdis &= ~HDMI_MC_CLKDIS_TMDSCLK_DISABLE;
	hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS);

	/* Enable csc path */
	if (is_color_space_conversion(hdmi)) {
		clkdis &= ~HDMI_MC_CLKDIS_CSCCLK_DISABLE;
		hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS);
	}
}

static void hdmi_enable_audio_clk(struct dw_hdmi *hdmi)
{
	hdmi_modb(hdmi, 0, HDMI_MC_CLKDIS_AUDCLK_DISABLE, HDMI_MC_CLKDIS);
}

/* Workaround to clear the overflow condition */
static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
{
	int count;
	u8 val;

	/* TMDS software reset */
	hdmi_writeb(hdmi, (u8)~HDMI_MC_SWRSTZ_TMDSSWRST_REQ, HDMI_MC_SWRSTZ);

	val = hdmi_readb(hdmi, HDMI_FC_INVIDCONF);
	if (hdmi->dev_type == IMX6DL_HDMI) {
		hdmi_writeb(hdmi, val, HDMI_FC_INVIDCONF);
		return;
	}

	for (count = 0; count < 4; count++)
		hdmi_writeb(hdmi, val, HDMI_FC_INVIDCONF);
}

static void hdmi_enable_overflow_interrupts(struct dw_hdmi *hdmi)
{
	hdmi_writeb(hdmi, 0, HDMI_FC_MASK2);
	hdmi_writeb(hdmi, 0, HDMI_IH_MUTE_FC_STAT2);
}

static void hdmi_disable_overflow_interrupts(struct dw_hdmi *hdmi)
{
	hdmi_writeb(hdmi, HDMI_IH_MUTE_FC_STAT2_OVERFLOW_MASK,
		    HDMI_IH_MUTE_FC_STAT2);
}

static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
{
	int ret;

	hdmi_disable_overflow_interrupts(hdmi);

	hdmi->vic = drm_match_cea_mode(mode);

	if (!hdmi->vic) {
		dev_dbg(hdmi->dev, "Non-CEA mode used in HDMI\n");
	} else {
		dev_dbg(hdmi->dev, "CEA mode used vic=%d\n", hdmi->vic);
	}

	if ((hdmi->vic == 6) || (hdmi->vic == 7) ||
	    (hdmi->vic == 21) || (hdmi->vic == 22) ||
	    (hdmi->vic == 2) || (hdmi->vic == 3) ||
	    (hdmi->vic == 17) || (hdmi->vic == 18))
		hdmi->hdmi_data.colorimetry = HDMI_COLORIMETRY_ITU_601;
	else
		hdmi->hdmi_data.colorimetry = HDMI_COLORIMETRY_ITU_709;

	hdmi->hdmi_data.video_mode.mpixelrepetitionoutput = 0;
	hdmi->hdmi_data.video_mode.mpixelrepetitioninput = 0;

	/* TODO: Get input format from IPU (via FB driver interface) */
	hdmi->hdmi_data.enc_in_format = RGB;

	hdmi->hdmi_data.enc_out_format = RGB;

	hdmi->hdmi_data.enc_color_depth = 8;
	hdmi->hdmi_data.pix_repet_factor = 0;
	hdmi->hdmi_data.hdcp_enable = 0;
	hdmi->hdmi_data.video_mode.mdataenablepolarity = true;

	/* HDMI Initialization Step B.1 */
	hdmi_av_composer(hdmi, mode);

	/* HDMI Initializateion Step B.2 */
	ret = dw_hdmi_phy_init(hdmi);
	if (ret)
		return ret;

	/* HDMI Initialization Step B.3 */
	dw_hdmi_enable_video_path(hdmi);

	if (hdmi->sink_has_audio) {
		dev_dbg(hdmi->dev, "sink has audio support\n");

		/* HDMI Initialization Step E - Configure audio */
		hdmi_clk_regenerator_update_pixel_clock(hdmi);
		hdmi_enable_audio_clk(hdmi);
	}

	/* not for DVI mode */
	if (hdmi->sink_is_hdmi) {
		dev_dbg(hdmi->dev, "%s HDMI mode\n", __func__);

		/* HDMI Initialization Step F - Configure AVI InfoFrame */
		hdmi_config_AVI(hdmi, mode);
	} else {
		dev_dbg(hdmi->dev, "%s DVI mode\n", __func__);
	}

	hdmi_video_packetize(hdmi);
	hdmi_video_csc(hdmi);
	hdmi_video_sample(hdmi);
	hdmi_tx_hdcp_config(hdmi);

	dw_hdmi_clear_overflow(hdmi);
	if (hdmi->cable_plugin && hdmi->sink_is_hdmi)
		hdmi_enable_overflow_interrupts(hdmi);

	return 0;
}

/* Wait until we are registered to enable interrupts */
static int dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
{
	hdmi_writeb(hdmi, HDMI_PHY_I2CM_INT_ADDR_DONE_POL,
		    HDMI_PHY_I2CM_INT_ADDR);

	hdmi_writeb(hdmi, HDMI_PHY_I2CM_CTLINT_ADDR_NAC_POL |
		    HDMI_PHY_I2CM_CTLINT_ADDR_ARBITRATION_POL,
		    HDMI_PHY_I2CM_CTLINT_ADDR);

	/* enable cable hot plug irq */
	hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);

	/* Clear Hotplug interrupts */
	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
		    HDMI_IH_PHY_STAT0);

	return 0;
}

static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi)
{
	u8 ih_mute;

	/*
	 * Boot up defaults are:
	 * HDMI_IH_MUTE   = 0x03 (disabled)
	 * HDMI_IH_MUTE_* = 0x00 (enabled)
	 *
	 * Disable top level interrupt bits in HDMI block
	 */
	ih_mute = hdmi_readb(hdmi, HDMI_IH_MUTE) |
		  HDMI_IH_MUTE_MUTE_WAKEUP_INTERRUPT |
		  HDMI_IH_MUTE_MUTE_ALL_INTERRUPT;

	hdmi_writeb(hdmi, ih_mute, HDMI_IH_MUTE);

	/* by default mask all interrupts */
	hdmi_writeb(hdmi, 0xff, HDMI_VP_MASK);
	hdmi_writeb(hdmi, 0xff, HDMI_FC_MASK0);
	hdmi_writeb(hdmi, 0xff, HDMI_FC_MASK1);
	hdmi_writeb(hdmi, 0xff, HDMI_FC_MASK2);
	hdmi_writeb(hdmi, 0xff, HDMI_PHY_MASK0);
	hdmi_writeb(hdmi, 0xff, HDMI_PHY_I2CM_INT_ADDR);
	hdmi_writeb(hdmi, 0xff, HDMI_PHY_I2CM_CTLINT_ADDR);
	hdmi_writeb(hdmi, 0xff, HDMI_AUD_INT);
	hdmi_writeb(hdmi, 0xff, HDMI_AUD_SPDIFINT);
	hdmi_writeb(hdmi, 0xff, HDMI_AUD_HBR_MASK);
	hdmi_writeb(hdmi, 0xff, HDMI_GP_MASK);
	hdmi_writeb(hdmi, 0xff, HDMI_A_APIINTMSK);
	hdmi_writeb(hdmi, 0xff, HDMI_CEC_MASK);
	hdmi_writeb(hdmi, 0xff, HDMI_I2CM_INT);
	hdmi_writeb(hdmi, 0xff, HDMI_I2CM_CTLINT);

	/* Disable interrupts in the IH_MUTE_* registers */
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_FC_STAT0);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_FC_STAT1);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_FC_STAT2);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_AS_STAT0);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_PHY_STAT0);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_I2CM_STAT0);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_CEC_STAT0);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_VP_STAT0);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_I2CMPHY_STAT0);
	hdmi_writeb(hdmi, 0xff, HDMI_IH_MUTE_AHBDMAAUD_STAT0);

	/* Enable top level interrupt bits in HDMI block */
	ih_mute &= ~(HDMI_IH_MUTE_MUTE_WAKEUP_INTERRUPT |
		    HDMI_IH_MUTE_MUTE_ALL_INTERRUPT);
	hdmi_writeb(hdmi, ih_mute, HDMI_IH_MUTE);
}

static void dw_hdmi_poweron(struct dw_hdmi *hdmi)
{
	hdmi->bridge_is_on = true;
	dw_hdmi_setup(hdmi, &hdmi->previous_mode);
}

static void dw_hdmi_poweroff(struct dw_hdmi *hdmi)
{
	dw_hdmi_phy_disable(hdmi);
	hdmi->bridge_is_on = false;
}

static void dw_hdmi_update_power(struct dw_hdmi *hdmi)
{
	int force = hdmi->force;

	if (hdmi->disabled) {
		force = DRM_FORCE_OFF;
	} else if (force == DRM_FORCE_UNSPECIFIED) {
		if (hdmi->rxsense)
			force = DRM_FORCE_ON;
		else
			force = DRM_FORCE_OFF;
	}

	if (force == DRM_FORCE_OFF) {
		if (hdmi->bridge_is_on)
			dw_hdmi_poweroff(hdmi);
	} else {
		if (!hdmi->bridge_is_on)
			dw_hdmi_poweron(hdmi);
	}
}

/*
 * Adjust the detection of RXSENSE according to whether we have a forced
 * connection mode enabled, or whether we have been disabled.  There is
 * no point processing RXSENSE interrupts if we have a forced connection
 * state, or DRM has us disabled.
 *
 * We also disable rxsense interrupts when we think we're disconnected
 * to avoid floating TDMS signals giving false rxsense interrupts.
 *
 * Note: we still need to listen for HPD interrupts even when DRM has us
 * disabled so that we can detect a connect event.
 */
static void dw_hdmi_update_phy_mask(struct dw_hdmi *hdmi)
{
	u8 old_mask = hdmi->phy_mask;

	if (hdmi->force || hdmi->disabled || !hdmi->rxsense)
		hdmi->phy_mask |= HDMI_PHY_RX_SENSE;
	else
		hdmi->phy_mask &= ~HDMI_PHY_RX_SENSE;

	if (old_mask != hdmi->phy_mask)
		hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
}

static void dw_hdmi_bridge_mode_set(struct drm_bridge *bridge,
				    struct drm_display_mode *orig_mode,
				    struct drm_display_mode *mode)
{
	struct dw_hdmi *hdmi = bridge->driver_private;

	mutex_lock(&hdmi->mutex);

	/* Store the display mode for plugin/DKMS poweron events */
	memcpy(&hdmi->previous_mode, mode, sizeof(hdmi->previous_mode));

	mutex_unlock(&hdmi->mutex);
}

static void dw_hdmi_bridge_disable(struct drm_bridge *bridge)
{
	struct dw_hdmi *hdmi = bridge->driver_private;

	mutex_lock(&hdmi->mutex);
	hdmi->disabled = true;
	dw_hdmi_update_power(hdmi);
	dw_hdmi_update_phy_mask(hdmi);
	mutex_unlock(&hdmi->mutex);
}

static void dw_hdmi_bridge_enable(struct drm_bridge *bridge)
{
	struct dw_hdmi *hdmi = bridge->driver_private;

	mutex_lock(&hdmi->mutex);
	hdmi->disabled = false;
	dw_hdmi_update_power(hdmi);
	dw_hdmi_update_phy_mask(hdmi);
	mutex_unlock(&hdmi->mutex);
}

static enum drm_connector_status
dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
	struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
					     connector);

	mutex_lock(&hdmi->mutex);
	hdmi->force = DRM_FORCE_UNSPECIFIED;
	dw_hdmi_update_power(hdmi);
	dw_hdmi_update_phy_mask(hdmi);
	mutex_unlock(&hdmi->mutex);

	return hdmi_readb(hdmi, HDMI_PHY_STAT0) & HDMI_PHY_HPD ?
		connector_status_connected : connector_status_disconnected;
}

static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
{
	struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
					     connector);
	struct edid *edid;
	int ret = 0;

	if (!hdmi->ddc)
		return 0;

	edid = drm_get_edid(connector, hdmi->ddc);
	if (edid) {
		dev_dbg(hdmi->dev, "got edid: width[%d] x height[%d]\n",
			edid->width_cm, edid->height_cm);

		hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
		hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
		drm_mode_connector_update_edid_property(connector, edid);
		ret = drm_add_edid_modes(connector, edid);
		/* Store the ELD */
		drm_edid_to_eld(connector, edid);
		kfree(edid);
	} else {
		dev_dbg(hdmi->dev, "failed to get edid\n");
	}

	return ret;
}

static enum drm_mode_status
dw_hdmi_connector_mode_valid(struct drm_connector *connector,
			     struct drm_display_mode *mode)
{
	struct dw_hdmi *hdmi = container_of(connector,
					   struct dw_hdmi, connector);
	enum drm_mode_status mode_status = MODE_OK;

	/* We don't support double-clocked modes */
	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
		return MODE_BAD;

	if (hdmi->plat_data->mode_valid)
		mode_status = hdmi->plat_data->mode_valid(connector, mode);

	return mode_status;
}

static void dw_hdmi_connector_force(struct drm_connector *connector)
{
	struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
					     connector);

	mutex_lock(&hdmi->mutex);
	hdmi->force = connector->force;
	dw_hdmi_update_power(hdmi);
	dw_hdmi_update_phy_mask(hdmi);
	mutex_unlock(&hdmi->mutex);
}

static const struct drm_connector_funcs dw_hdmi_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = dw_hdmi_connector_detect,
	.destroy = drm_connector_cleanup,
	.force = dw_hdmi_connector_force,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static const struct drm_connector_helper_funcs dw_hdmi_connector_helper_funcs = {
	.get_modes = dw_hdmi_connector_get_modes,
	.mode_valid = dw_hdmi_connector_mode_valid,
	.best_encoder = drm_atomic_helper_best_encoder,
};

static const struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
	.enable = dw_hdmi_bridge_enable,
	.disable = dw_hdmi_bridge_disable,
	.mode_set = dw_hdmi_bridge_mode_set,
};

static irqreturn_t dw_hdmi_i2c_irq(struct dw_hdmi *hdmi)
{
	struct dw_hdmi_i2c *i2c = hdmi->i2c;
	unsigned int stat;

	stat = hdmi_readb(hdmi, HDMI_IH_I2CM_STAT0);
	if (!stat)
		return IRQ_NONE;

	hdmi_writeb(hdmi, stat, HDMI_IH_I2CM_STAT0);

	i2c->stat = stat;

	complete(&i2c->cmp);

	return IRQ_HANDLED;
}

static irqreturn_t dw_hdmi_hardirq(int irq, void *dev_id)
{
	struct dw_hdmi *hdmi = dev_id;
	u8 intr_stat;
	irqreturn_t ret = IRQ_NONE;

	if (hdmi->i2c)
		ret = dw_hdmi_i2c_irq(hdmi);

	intr_stat = hdmi_readb(hdmi, HDMI_IH_PHY_STAT0);
	if (intr_stat) {
		hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
		return IRQ_WAKE_THREAD;
	}

	return ret;
}

static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
{
	struct dw_hdmi *hdmi = dev_id;
	u8 intr_stat, phy_int_pol, phy_pol_mask, phy_stat;

	intr_stat = hdmi_readb(hdmi, HDMI_IH_PHY_STAT0);
	phy_int_pol = hdmi_readb(hdmi, HDMI_PHY_POL0);
	phy_stat = hdmi_readb(hdmi, HDMI_PHY_STAT0);

	phy_pol_mask = 0;
	if (intr_stat & HDMI_IH_PHY_STAT0_HPD)
		phy_pol_mask |= HDMI_PHY_HPD;
	if (intr_stat & HDMI_IH_PHY_STAT0_RX_SENSE0)
		phy_pol_mask |= HDMI_PHY_RX_SENSE0;
	if (intr_stat & HDMI_IH_PHY_STAT0_RX_SENSE1)
		phy_pol_mask |= HDMI_PHY_RX_SENSE1;
	if (intr_stat & HDMI_IH_PHY_STAT0_RX_SENSE2)
		phy_pol_mask |= HDMI_PHY_RX_SENSE2;
	if (intr_stat & HDMI_IH_PHY_STAT0_RX_SENSE3)
		phy_pol_mask |= HDMI_PHY_RX_SENSE3;

	if (phy_pol_mask)
		hdmi_modb(hdmi, ~phy_int_pol, phy_pol_mask, HDMI_PHY_POL0);

	/*
	 * RX sense tells us whether the TDMS transmitters are detecting
	 * load - in other words, there's something listening on the
	 * other end of the link.  Use this to decide whether we should
	 * power on the phy as HPD may be toggled by the sink to merely
	 * ask the source to re-read the EDID.
	 */
	if (intr_stat &
	    (HDMI_IH_PHY_STAT0_RX_SENSE | HDMI_IH_PHY_STAT0_HPD)) {
		mutex_lock(&hdmi->mutex);
		if (!hdmi->disabled && !hdmi->force) {
			/*
			 * If the RX sense status indicates we're disconnected,
			 * clear the software rxsense status.
			 */
			if (!(phy_stat & HDMI_PHY_RX_SENSE))
				hdmi->rxsense = false;

			/*
			 * Only set the software rxsense status when both
			 * rxsense and hpd indicates we're connected.
			 * This avoids what seems to be bad behaviour in
			 * at least iMX6S versions of the phy.
			 */
			if (phy_stat & HDMI_PHY_HPD)
				hdmi->rxsense = true;

			dw_hdmi_update_power(hdmi);
			dw_hdmi_update_phy_mask(hdmi);
		}
		mutex_unlock(&hdmi->mutex);
	}

	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
		dev_dbg(hdmi->dev, "EVENT=%s\n",
			phy_int_pol & HDMI_PHY_HPD ? "plugin" : "plugout");
		drm_helper_hpd_irq_event(hdmi->bridge->dev);
	}

	hdmi_writeb(hdmi, intr_stat, HDMI_IH_PHY_STAT0);
	hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE),
		    HDMI_IH_MUTE_PHY_STAT0);

	return IRQ_HANDLED;
}

static int dw_hdmi_register(struct drm_device *drm, struct dw_hdmi *hdmi)
{
	struct drm_encoder *encoder = hdmi->encoder;
	struct drm_bridge *bridge;
	int ret;

	bridge = devm_kzalloc(drm->dev, sizeof(*bridge), GFP_KERNEL);
	if (!bridge) {
		DRM_ERROR("Failed to allocate drm bridge\n");
		return -ENOMEM;
	}

	hdmi->bridge = bridge;
	bridge->driver_private = hdmi;
	bridge->funcs = &dw_hdmi_bridge_funcs;
	ret = drm_bridge_attach(encoder, bridge, NULL);
	if (ret) {
		DRM_ERROR("Failed to initialize bridge with drm\n");
		return -EINVAL;
	}

	hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;

	drm_connector_helper_add(&hdmi->connector,
				 &dw_hdmi_connector_helper_funcs);

	drm_connector_init(drm, &hdmi->connector,
			   &dw_hdmi_connector_funcs,
			   DRM_MODE_CONNECTOR_HDMIA);

	drm_mode_connector_attach_encoder(&hdmi->connector, encoder);

	return 0;
}

int dw_hdmi_bind(struct device *dev, struct drm_encoder *encoder,
		 struct resource *iores, int irq,
		 const struct dw_hdmi_plat_data *plat_data)
{
	struct device_node *np = dev->of_node;
	struct platform_device_info pdevinfo;
	struct device_node *ddc_node;
	struct dw_hdmi *hdmi;
	int ret;
	u32 val = 1;
	u8 config0;
	u8 config1;

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

	hdmi->connector.interlace_allowed = 1;

	hdmi->plat_data = plat_data;
	hdmi->dev = dev;
	hdmi->dev_type = plat_data->dev_type;
	hdmi->sample_rate = 48000;
	hdmi->encoder = encoder;
	hdmi->disabled = true;
	hdmi->rxsense = true;
	hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);

	mutex_init(&hdmi->mutex);
	mutex_init(&hdmi->audio_mutex);
	spin_lock_init(&hdmi->audio_lock);

	of_property_read_u32(np, "reg-io-width", &val);

	switch (val) {
	case 4:
		hdmi->write = dw_hdmi_writel;
		hdmi->read = dw_hdmi_readl;
		break;
	case 1:
		hdmi->write = dw_hdmi_writeb;
		hdmi->read = dw_hdmi_readb;
		break;
	default:
		dev_err(dev, "reg-io-width must be 1 or 4\n");
		return -EINVAL;
	}

	ddc_node = of_parse_phandle(np, "ddc-i2c-bus", 0);
	if (ddc_node) {
		hdmi->ddc = of_get_i2c_adapter_by_node(ddc_node);
		of_node_put(ddc_node);
		if (!hdmi->ddc) {
			dev_dbg(hdmi->dev, "failed to read ddc node\n");
			return -EPROBE_DEFER;
		}

	} else {
		dev_dbg(hdmi->dev, "no ddc property found\n");
	}

	hdmi->regs = devm_ioremap_resource(dev, iores);
	if (IS_ERR(hdmi->regs)) {
		ret = PTR_ERR(hdmi->regs);
		goto err_res;
	}

	hdmi->isfr_clk = devm_clk_get(hdmi->dev, "isfr");
	if (IS_ERR(hdmi->isfr_clk)) {
		ret = PTR_ERR(hdmi->isfr_clk);
		dev_err(hdmi->dev, "Unable to get HDMI isfr clk: %d\n", ret);
		goto err_res;
	}

	ret = clk_prepare_enable(hdmi->isfr_clk);
	if (ret) {
		dev_err(hdmi->dev, "Cannot enable HDMI isfr clock: %d\n", ret);
		goto err_res;
	}

	hdmi->iahb_clk = devm_clk_get(hdmi->dev, "iahb");
	if (IS_ERR(hdmi->iahb_clk)) {
		ret = PTR_ERR(hdmi->iahb_clk);
		dev_err(hdmi->dev, "Unable to get HDMI iahb clk: %d\n", ret);
		goto err_isfr;
	}

	ret = clk_prepare_enable(hdmi->iahb_clk);
	if (ret) {
		dev_err(hdmi->dev, "Cannot enable HDMI iahb clock: %d\n", ret);
		goto err_isfr;
	}

	/* Product and revision IDs */
	dev_info(dev,
		 "Detected HDMI controller 0x%x:0x%x:0x%x:0x%x\n",
		 hdmi_readb(hdmi, HDMI_DESIGN_ID),
		 hdmi_readb(hdmi, HDMI_REVISION_ID),
		 hdmi_readb(hdmi, HDMI_PRODUCT_ID0),
		 hdmi_readb(hdmi, HDMI_PRODUCT_ID1));

	initialize_hdmi_ih_mutes(hdmi);

	ret = devm_request_threaded_irq(dev, irq, dw_hdmi_hardirq,
					dw_hdmi_irq, IRQF_SHARED,
					dev_name(dev), hdmi);
	if (ret)
		goto err_iahb;

	/*
	 * To prevent overflows in HDMI_IH_FC_STAT2, set the clk regenerator
	 * N and cts values before enabling phy
	 */
	hdmi_init_clk_regenerator(hdmi);

	/* If DDC bus is not specified, try to register HDMI I2C bus */
	if (!hdmi->ddc) {
		hdmi->ddc = dw_hdmi_i2c_adapter(hdmi);
		if (IS_ERR(hdmi->ddc))
			hdmi->ddc = NULL;
	}

	/*
	 * Configure registers related to HDMI interrupt
	 * generation before registering IRQ.
	 */
	hdmi_writeb(hdmi, HDMI_PHY_HPD | HDMI_PHY_RX_SENSE, HDMI_PHY_POL0);

	/* Clear Hotplug interrupts */
	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
		    HDMI_IH_PHY_STAT0);

	ret = dw_hdmi_fb_registered(hdmi);
	if (ret)
		goto err_iahb;

	ret = dw_hdmi_register(encoder->dev, hdmi);
	if (ret)
		goto err_iahb;

	/* Unmute interrupts */
	hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE),
		    HDMI_IH_MUTE_PHY_STAT0);

	memset(&pdevinfo, 0, sizeof(pdevinfo));
	pdevinfo.parent = dev;
	pdevinfo.id = PLATFORM_DEVID_AUTO;

	config0 = hdmi_readb(hdmi, HDMI_CONFIG0_ID);
	config1 = hdmi_readb(hdmi, HDMI_CONFIG1_ID);

	if (config1 & HDMI_CONFIG1_AHB) {
		struct dw_hdmi_audio_data audio;

		audio.phys = iores->start;
		audio.base = hdmi->regs;
		audio.irq = irq;
		audio.hdmi = hdmi;
		audio.eld = hdmi->connector.eld;

		pdevinfo.name = "dw-hdmi-ahb-audio";
		pdevinfo.data = &audio;
		pdevinfo.size_data = sizeof(audio);
		pdevinfo.dma_mask = DMA_BIT_MASK(32);
		hdmi->audio = platform_device_register_full(&pdevinfo);
	} else if (config0 & HDMI_CONFIG0_I2S) {
		struct dw_hdmi_i2s_audio_data audio;

		audio.hdmi	= hdmi;
		audio.write	= hdmi_writeb;
		audio.read	= hdmi_readb;

		pdevinfo.name = "dw-hdmi-i2s-audio";
		pdevinfo.data = &audio;
		pdevinfo.size_data = sizeof(audio);
		pdevinfo.dma_mask = DMA_BIT_MASK(32);
		hdmi->audio = platform_device_register_full(&pdevinfo);
	}

	/* Reset HDMI DDC I2C master controller and mute I2CM interrupts */
	if (hdmi->i2c)
		dw_hdmi_i2c_init(hdmi);

	dev_set_drvdata(dev, hdmi);

	return 0;

err_iahb:
	if (hdmi->i2c) {
		i2c_del_adapter(&hdmi->i2c->adap);
		hdmi->ddc = NULL;
	}

	clk_disable_unprepare(hdmi->iahb_clk);
err_isfr:
	clk_disable_unprepare(hdmi->isfr_clk);
err_res:
	i2c_put_adapter(hdmi->ddc);

	return ret;
}
EXPORT_SYMBOL_GPL(dw_hdmi_bind);

void dw_hdmi_unbind(struct device *dev)
{
	struct dw_hdmi *hdmi = dev_get_drvdata(dev);

	if (hdmi->audio && !IS_ERR(hdmi->audio))
		platform_device_unregister(hdmi->audio);

	/* Disable all interrupts */
	hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);

	clk_disable_unprepare(hdmi->iahb_clk);
	clk_disable_unprepare(hdmi->isfr_clk);

	if (hdmi->i2c)
		i2c_del_adapter(&hdmi->i2c->adap);
	else
		i2c_put_adapter(hdmi->ddc);
}
EXPORT_SYMBOL_GPL(dw_hdmi_unbind);

MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>");
MODULE_DESCRIPTION("DW HDMI transmitter driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dw-hdmi");