/*
 * Analogix DP (Display port) core register interface driver.
 *
 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
 * Author: Jingoo Han <jg1.han@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 <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/phy/phy.h>

#include <drm/bridge/analogix_dp.h>

#include "analogix_dp_core.h"
#include "analogix_dp_reg.h"

#define COMMON_INT_MASK_1	0
#define COMMON_INT_MASK_2	0
#define COMMON_INT_MASK_3	0
#define COMMON_INT_MASK_4	(HOTPLUG_CHG | HPD_LOST | PLUG)

static void analogix_dp_write(struct analogix_dp_device *dp, u32 reg, u32 val)
{
	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type)) {
		readl(dp->reg_base);
		writel(val, dp->reg_base + reg);
	}

	writel(val, dp->reg_base + reg);
}

static u32 analogix_dp_read(struct analogix_dp_device *dp, u32 reg)
{
	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
		readl(dp->reg_base + reg);

	return readl(dp->reg_base + reg);
}

void analogix_dp_enable_video_mute(struct analogix_dp_device *dp, bool enable)
{
	u32 reg;

	if (enable) {
		reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_1);
		reg |= HDCP_VIDEO_MUTE;
		analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_1, reg);
	} else {
		reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_1);
		reg &= ~HDCP_VIDEO_MUTE;
		analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_1, reg);
	}
}

void analogix_dp_stop_video(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_1);
	reg &= ~VIDEO_EN;
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_1, reg);
}

void analogix_dp_lane_swap(struct analogix_dp_device *dp, bool enable)
{
	u32 reg;

	if (enable)
		reg = LANE3_MAP_LOGIC_LANE_0 | LANE2_MAP_LOGIC_LANE_1 |
		      LANE1_MAP_LOGIC_LANE_2 | LANE0_MAP_LOGIC_LANE_3;
	else
		reg = LANE3_MAP_LOGIC_LANE_3 | LANE2_MAP_LOGIC_LANE_2 |
		      LANE1_MAP_LOGIC_LANE_1 | LANE0_MAP_LOGIC_LANE_0;

	analogix_dp_write(dp, ANALOGIX_DP_LANE_MAP, reg);
}

void analogix_dp_init_analog_param(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = TX_TERMINAL_CTRL_50_OHM;
	analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_1, reg);

	reg = SEL_24M | TX_DVDD_BIT_1_0625V;
	analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_2, reg);

	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type)) {
		reg = REF_CLK_24M;
		if (dp->plat_data->dev_type == RK3288_DP ||
		    dp->plat_data->dev_type == RK3368_EDP)
			reg ^= REF_CLK_MASK;

		analogix_dp_write(dp, ANALOGIX_DP_PLL_REG_1, reg);
		analogix_dp_write(dp, ANALOGIX_DP_PLL_REG_2, 0x99);
		analogix_dp_write(dp, ANALOGIX_DP_PLL_REG_3, 0x40);
		analogix_dp_write(dp, ANALOGIX_DP_PLL_REG_4, 0x58);
		analogix_dp_write(dp, ANALOGIX_DP_PLL_REG_5, 0x22);
		analogix_dp_write(dp, ANALOGIX_DP_BIAS, 0x44);
	}

	reg = DRIVE_DVDD_BIT_1_0625V | VCO_BIT_600_MICRO;
	analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_3, reg);

	reg = PD_RING_OSC | AUX_TERMINAL_CTRL_50_OHM |
		TX_CUR1_2X | TX_CUR_16_MA;
	analogix_dp_write(dp, ANALOGIX_DP_PLL_FILTER_CTL_1, reg);

	reg = CH3_AMP_400_MV | CH2_AMP_400_MV |
		CH1_AMP_400_MV | CH0_AMP_400_MV;
	analogix_dp_write(dp, ANALOGIX_DP_TX_AMP_TUNING_CTL, reg);

	analogix_dp_write(dp, ANALOGIX_DP_AUX, 0x4);
}

void analogix_dp_init_interrupt(struct analogix_dp_device *dp)
{
	/* Set interrupt pin assertion polarity as high */
	analogix_dp_write(dp, ANALOGIX_DP_INT_CTL, INT_POL1 | INT_POL0);

	/* Clear pending regisers */
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_STA_1, 0xff);
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_STA_2, 0x4f);
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_STA_3, 0xe0);
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_STA_4, 0xe7);
	analogix_dp_write(dp, ANALOGIX_DP_INT_STA, 0x63);

	/* 0:mask,1: unmask */
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_1, 0x00);
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_2, 0x00);
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_3, 0x00);
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_4, 0x00);
	analogix_dp_write(dp, ANALOGIX_DP_INT_STA_MASK, 0x00);
}

void analogix_dp_reset(struct analogix_dp_device *dp)
{
	u32 reg;

	analogix_dp_stop_video(dp);
	analogix_dp_enable_video_mute(dp, 0);

	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
		reg = RK_VID_CAP_FUNC_EN_N | RK_VID_FIFO_FUNC_EN_N |
			SW_FUNC_EN_N;
	else
		reg = MASTER_VID_FUNC_EN_N | SLAVE_VID_FUNC_EN_N |
			AUD_FIFO_FUNC_EN_N | AUD_FUNC_EN_N |
			HDCP_FUNC_EN_N | SW_FUNC_EN_N;

	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_1, reg);

	reg = SSC_FUNC_EN_N | AUX_FUNC_EN_N |
		SERDES_FIFO_FUNC_EN_N |
		LS_CLK_DOMAIN_FUNC_EN_N;
	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_2, reg);

	usleep_range(20, 30);

	analogix_dp_lane_swap(dp, 0);

	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_1, 0x0);
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_2, 0x40);
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_3, 0x0);
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_4, 0x0);

	analogix_dp_write(dp, ANALOGIX_DP_PKT_SEND_CTL, 0x0);
	analogix_dp_write(dp, ANALOGIX_DP_HDCP_CTL, 0x0);

	analogix_dp_write(dp, ANALOGIX_DP_HPD_DEGLITCH_L, 0x5e);
	analogix_dp_write(dp, ANALOGIX_DP_HPD_DEGLITCH_H, 0x1a);

	analogix_dp_write(dp, ANALOGIX_DP_LINK_DEBUG_CTL, 0x10);

	analogix_dp_write(dp, ANALOGIX_DP_PHY_TEST, 0x0);

	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_FIFO_THRD, 0x0);
	analogix_dp_write(dp, ANALOGIX_DP_AUDIO_MARGIN, 0x20);

	analogix_dp_write(dp, ANALOGIX_DP_M_VID_GEN_FILTER_TH, 0x4);
	analogix_dp_write(dp, ANALOGIX_DP_M_AUD_GEN_FILTER_TH, 0x2);

	analogix_dp_write(dp, ANALOGIX_DP_SOC_GENERAL_CTL, 0x00000101);
}

void analogix_dp_swreset(struct analogix_dp_device *dp)
{
	analogix_dp_write(dp, ANALOGIX_DP_TX_SW_RESET, RESET_DP_TX);
}

void analogix_dp_config_interrupt(struct analogix_dp_device *dp)
{
	u32 reg;

	/* 0: mask, 1: unmask */
	reg = COMMON_INT_MASK_1;
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_1, reg);

	reg = COMMON_INT_MASK_2;
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_2, reg);

	reg = COMMON_INT_MASK_3;
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_3, reg);

	if (dp->force_hpd || dp->hpd_gpiod)
		analogix_dp_mute_hpd_interrupt(dp);
	else
		analogix_dp_unmute_hpd_interrupt(dp);
}

void analogix_dp_mute_hpd_interrupt(struct analogix_dp_device *dp)
{
	u32 reg;

	/* 0: mask, 1: unmask */
	reg = analogix_dp_read(dp, ANALOGIX_DP_COMMON_INT_MASK_4);
	reg &= ~COMMON_INT_MASK_4;
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_4, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_INT_STA_MASK);
	reg &= ~INT_HPD;
	analogix_dp_write(dp, ANALOGIX_DP_INT_STA_MASK, reg);
}

void analogix_dp_unmute_hpd_interrupt(struct analogix_dp_device *dp)
{
	u32 reg;

	/* 0: mask, 1: unmask */
	reg = COMMON_INT_MASK_4;
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_MASK_4, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_INT_STA_MASK);
	reg |= INT_HPD;
	analogix_dp_write(dp, ANALOGIX_DP_INT_STA_MASK, reg);
}

enum pll_status analogix_dp_get_pll_lock_status(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_DEBUG_CTL);
	if (reg & PLL_LOCK)
		return PLL_LOCKED;
	else
		return PLL_UNLOCKED;
}

void analogix_dp_set_pll_power_down(struct analogix_dp_device *dp, bool enable)
{
	u32 reg;
	u32 mask = DP_PLL_PD;
	u32 pd_addr = ANALOGIX_DP_PLL_CTL;

	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type)) {
		pd_addr = ANALOGIX_DP_PD;
		mask = RK_PLL_PD;
	}

	reg = analogix_dp_read(dp, pd_addr);
	if (enable)
		reg |= mask;
	else
		reg &= ~mask;
	analogix_dp_write(dp, pd_addr, reg);
}

void analogix_dp_set_analog_power_down(struct analogix_dp_device *dp,
				       enum analog_power_block block,
				       bool enable)
{
	u32 reg;
	u32 phy_pd_addr = ANALOGIX_DP_PHY_PD;
	u32 mask;

	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
		phy_pd_addr = ANALOGIX_DP_PD;

	switch (block) {
	case AUX_BLOCK:
		if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
			mask = RK_AUX_PD;
		else
			mask = AUX_PD;

		reg = analogix_dp_read(dp, phy_pd_addr);
		if (enable) {
			reg &= ~(DP_INC_BG | DP_EXP_BG);
			reg |= mask;
		} else {
			reg &= ~mask;
		}
		analogix_dp_write(dp, phy_pd_addr, reg);
		break;
	case CH0_BLOCK:
		mask = CH0_PD;
		reg = analogix_dp_read(dp, phy_pd_addr);

		if (enable)
			reg |= mask;
		else
			reg &= ~mask;
		analogix_dp_write(dp, phy_pd_addr, reg);
		break;
	case CH1_BLOCK:
		mask = CH1_PD;
		reg = analogix_dp_read(dp, phy_pd_addr);

		if (enable)
			reg |= mask;
		else
			reg &= ~mask;
		analogix_dp_write(dp, phy_pd_addr, reg);
		break;
	case CH2_BLOCK:
		mask = CH2_PD;
		reg = analogix_dp_read(dp, phy_pd_addr);

		if (enable)
			reg |= mask;
		else
			reg &= ~mask;
		analogix_dp_write(dp, phy_pd_addr, reg);
		break;
	case CH3_BLOCK:
		mask = CH3_PD;
		reg = analogix_dp_read(dp, phy_pd_addr);

		if (enable)
			reg |= mask;
		else
			reg &= ~mask;
		analogix_dp_write(dp, phy_pd_addr, reg);
		break;
	case ANALOG_TOTAL:
		/*
		 * There is no bit named DP_PHY_PD, so We used DP_INC_BG
		 * to power off everything instead of DP_PHY_PD in
		 * Rockchip
		 */
		if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
			mask = DP_INC_BG;
		else
			mask = DP_PHY_PD;

		reg = analogix_dp_read(dp, phy_pd_addr);
		if (enable)
			reg |= mask;
		else
			reg &= ~mask;

		analogix_dp_write(dp, phy_pd_addr, reg);
		if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
			usleep_range(10, 15);
		break;
	case POWER_ALL:
		if (enable) {
			reg = DP_ALL_PD;
			analogix_dp_write(dp, phy_pd_addr, reg);
		} else {
			reg = DP_ALL_PD;
			analogix_dp_write(dp, phy_pd_addr, reg);
			usleep_range(10, 15);
			reg &= ~DP_INC_BG;
			analogix_dp_write(dp, phy_pd_addr, reg);
			usleep_range(10, 15);

			analogix_dp_write(dp, phy_pd_addr, 0x00);
		}
		break;
	default:
		break;
	}
}

int analogix_dp_init_analog_func(struct analogix_dp_device *dp)
{
	u32 reg;

	analogix_dp_set_analog_power_down(dp, POWER_ALL, 0);

	reg = PLL_LOCK_CHG;
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_STA_1, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_DEBUG_CTL);
	reg &= ~(F_PLL_LOCK | PLL_LOCK_CTRL);
	analogix_dp_write(dp, ANALOGIX_DP_DEBUG_CTL, reg);

	/* Power up PLL */
	analogix_dp_set_pll_power_down(dp, 0);

	/* Enable Serdes FIFO function and Link symbol clock domain module */
	reg = analogix_dp_read(dp, ANALOGIX_DP_FUNC_EN_2);
	reg &= ~(SERDES_FIFO_FUNC_EN_N | LS_CLK_DOMAIN_FUNC_EN_N
		| AUX_FUNC_EN_N);
	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_2, reg);
	return 0;
}

void analogix_dp_clear_hotplug_interrupts(struct analogix_dp_device *dp)
{
	u32 reg;

	if (dp->hpd_gpiod)
		return;

	reg = HOTPLUG_CHG | HPD_LOST | PLUG;
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_STA_4, reg);

	reg = INT_HPD;
	analogix_dp_write(dp, ANALOGIX_DP_INT_STA, reg);
}

void analogix_dp_init_hpd(struct analogix_dp_device *dp)
{
	u32 reg;

	if (dp->hpd_gpiod)
		return;

	analogix_dp_clear_hotplug_interrupts(dp);

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_3);
	reg &= ~(F_HPD | HPD_CTRL);
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_3, reg);
}

void analogix_dp_force_hpd(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_3);
	reg |= (F_HPD | HPD_CTRL);
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_3, reg);
}

enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp)
{
	u32 reg;

	/* Parse hotplug interrupt status register */
	reg = analogix_dp_read(dp, ANALOGIX_DP_COMMON_INT_STA_4);

	if (reg & PLUG)
		return DP_IRQ_TYPE_HP_CABLE_IN;

	if (reg & HPD_LOST)
		return DP_IRQ_TYPE_HP_CABLE_OUT;

	if (reg & HOTPLUG_CHG)
		return DP_IRQ_TYPE_HP_CHANGE;

	return DP_IRQ_TYPE_UNKNOWN;
}

void analogix_dp_reset_aux(struct analogix_dp_device *dp)
{
	u32 reg;

	/* Disable AUX channel module */
	reg = analogix_dp_read(dp, ANALOGIX_DP_FUNC_EN_2);
	reg |= AUX_FUNC_EN_N;
	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_2, reg);
}

void analogix_dp_init_aux(struct analogix_dp_device *dp)
{
	u32 reg;

	/* Clear inerrupts related to AUX channel */
	reg = RPLY_RECEIV | AUX_ERR;
	analogix_dp_write(dp, ANALOGIX_DP_INT_STA, reg);

	analogix_dp_set_analog_power_down(dp, AUX_BLOCK, true);
	usleep_range(10, 11);
	analogix_dp_set_analog_power_down(dp, AUX_BLOCK, false);

	analogix_dp_reset_aux(dp);

	/* AUX_BIT_PERIOD_EXPECTED_DELAY doesn't apply to Rockchip IP */
	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
		reg = 0;
	else
		reg = AUX_BIT_PERIOD_EXPECTED_DELAY(3);

	/* Disable AUX transaction H/W retry */
	reg |= AUX_HW_RETRY_COUNT_SEL(0) |
	       AUX_HW_RETRY_INTERVAL_600_MICROSECONDS;

	analogix_dp_write(dp, ANALOGIX_DP_AUX_HW_RETRY_CTL, reg);

	/* Receive AUX Channel DEFER commands equal to DEFFER_COUNT*64 */
	reg = DEFER_CTRL_EN | DEFER_COUNT(1);
	analogix_dp_write(dp, ANALOGIX_DP_AUX_CH_DEFER_CTL, reg);

	/* Enable AUX channel module */
	analogix_dp_enable_sw_function(dp);
	reg = analogix_dp_read(dp, ANALOGIX_DP_FUNC_EN_2);
	reg &= ~AUX_FUNC_EN_N;
	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_2, reg);
}

int analogix_dp_get_plug_in_status(struct analogix_dp_device *dp)
{
	u32 reg;

	if (dp->hpd_gpiod) {
		if (gpiod_get_value(dp->hpd_gpiod))
			return 0;
	} else {
		reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_3);
		if (reg & HPD_STATUS)
			return 0;
	}

	return -EINVAL;
}

void analogix_dp_enable_sw_function(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_FUNC_EN_1);
	reg &= ~SW_FUNC_EN_N;
	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_1, reg);
}

int analogix_dp_start_aux_transaction(struct analogix_dp_device *dp)
{
	int reg;
	int retval = 0;
	int timeout_loop = 0;

	/* Enable AUX CH operation */
	reg = analogix_dp_read(dp, ANALOGIX_DP_AUX_CH_CTL_2);
	reg |= AUX_EN;
	analogix_dp_write(dp, ANALOGIX_DP_AUX_CH_CTL_2, reg);

	/* Is AUX CH command reply received? */
	reg = analogix_dp_read(dp, ANALOGIX_DP_INT_STA);
	while (!(reg & RPLY_RECEIV)) {
		timeout_loop++;
		if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
			dev_err(dp->dev, "AUX CH command reply failed!\n");
			return -ETIMEDOUT;
		}
		reg = analogix_dp_read(dp, ANALOGIX_DP_INT_STA);
		usleep_range(10, 11);
	}

	/* Clear interrupt source for AUX CH command reply */
	analogix_dp_write(dp, ANALOGIX_DP_INT_STA, RPLY_RECEIV);

	/* Clear interrupt source for AUX CH access error */
	reg = analogix_dp_read(dp, ANALOGIX_DP_INT_STA);
	if (reg & AUX_ERR) {
		analogix_dp_write(dp, ANALOGIX_DP_INT_STA, AUX_ERR);
		return -EREMOTEIO;
	}

	/* Check AUX CH error access status */
	reg = analogix_dp_read(dp, ANALOGIX_DP_AUX_CH_STA);
	if ((reg & AUX_STATUS_MASK) != 0) {
		dev_err(dp->dev, "AUX CH error happens: %d\n\n",
			reg & AUX_STATUS_MASK);
		return -EREMOTEIO;
	}

	return retval;
}

int analogix_dp_write_byte_to_dpcd(struct analogix_dp_device *dp,
				   unsigned int reg_addr,
				   unsigned char data)
{
	u32 reg;
	int i;
	int retval;

	for (i = 0; i < 3; i++) {
		/* Clear AUX CH data buffer */
		reg = BUF_CLR;
		analogix_dp_write(dp, ANALOGIX_DP_BUFFER_DATA_CTL, reg);

		/* Select DPCD device address */
		reg = AUX_ADDR_7_0(reg_addr);
		analogix_dp_write(dp, ANALOGIX_DP_AUX_ADDR_7_0, reg);
		reg = AUX_ADDR_15_8(reg_addr);
		analogix_dp_write(dp, ANALOGIX_DP_AUX_ADDR_15_8, reg);
		reg = AUX_ADDR_19_16(reg_addr);
		analogix_dp_write(dp, ANALOGIX_DP_AUX_ADDR_19_16, reg);

		/* Write data buffer */
		reg = (unsigned int)data;
		analogix_dp_write(dp, ANALOGIX_DP_BUF_DATA_0, reg);

		/*
		 * Set DisplayPort transaction and write 1 byte
		 * If bit 3 is 1, DisplayPort transaction.
		 * If Bit 3 is 0, I2C transaction.
		 */
		reg = AUX_TX_COMM_DP_TRANSACTION | AUX_TX_COMM_WRITE;
		analogix_dp_write(dp, ANALOGIX_DP_AUX_CH_CTL_1, reg);

		/* Start AUX transaction */
		retval = analogix_dp_start_aux_transaction(dp);
		if (retval == 0)
			break;

		dev_dbg(dp->dev, "%s: Aux Transaction fail!\n", __func__);
	}

	return retval;
}

static void analogix_dp_ssc_enable(struct analogix_dp_device *dp)
{
	u32 reg;

	writel(0x17, dp->reg_base + ANALOGIX_DP_SSC_REG);
	/*
	 * To apply updated SSC parameters into SSC operation,
	 * firmware must disable and enable this bit.
	 */
	reg = readl(dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
	reg |= SSC_FUNC_EN_N;
	writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
	reg &= ~SSC_FUNC_EN_N;
	writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
}

static void analogix_dp_ssc_disable(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = readl(dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
	reg |= SSC_FUNC_EN_N;
	writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
}

bool analogix_dp_ssc_supported(struct analogix_dp_device *dp)
{
	/* Check if SSC is supported by both sides */
	return dp->plat_data->ssc && dp->link_train.ssc;
}

void analogix_dp_set_link_bandwidth(struct analogix_dp_device *dp, u32 bwtype)
{
	u32 status;
	int ret;

	analogix_dp_write(dp, ANALOGIX_DP_LINK_BW_SET, bwtype);

	if (dp->phy) {
		union phy_configure_opts phy_cfg;

		phy_cfg.dp.lanes = dp->link_train.lane_count;
		phy_cfg.dp.link_rate = drm_dp_bw_code_to_link_rate(dp->link_train.link_rate) / 100;
		phy_cfg.dp.ssc = analogix_dp_ssc_supported(dp);
		phy_cfg.dp.set_lanes = false;
		phy_cfg.dp.set_rate = true;
		phy_cfg.dp.set_voltages = false;
		ret = phy_configure(dp->phy, &phy_cfg);
		if (ret && ret != -EOPNOTSUPP) {
			dev_err(dp->dev, "%s: phy_configure() failed: %d\n",
				__func__, ret);
			return;
		}
	} else {
		if (analogix_dp_ssc_supported(dp))
			analogix_dp_ssc_enable(dp);
		else
			analogix_dp_ssc_disable(dp);
	}

	ret = readx_poll_timeout(analogix_dp_get_pll_lock_status, dp, status,
				 status != PLL_UNLOCKED, 120,
				 120 * DP_TIMEOUT_LOOP_COUNT);
	if (ret) {
		dev_err(dp->dev, "Wait for pll lock failed %d\n", ret);
		return;
	}
}

void analogix_dp_get_link_bandwidth(struct analogix_dp_device *dp, u32 *bwtype)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_LINK_BW_SET);
	*bwtype = reg;
}

void analogix_dp_set_lane_count(struct analogix_dp_device *dp, u32 count)
{
	u32 reg;
	int ret;

	reg = count;
	analogix_dp_write(dp, ANALOGIX_DP_LANE_COUNT_SET, reg);

	if (dp->phy) {
		union phy_configure_opts phy_cfg;

		phy_cfg.dp.lanes = dp->link_train.lane_count;
		phy_cfg.dp.set_lanes = true;
		phy_cfg.dp.set_rate = false;
		phy_cfg.dp.set_voltages = false;
		ret = phy_configure(dp->phy, &phy_cfg);
		if (ret && ret != -EOPNOTSUPP) {
			dev_err(dp->dev, "%s: phy_configure() failed: %d\n",
				__func__, ret);
			return;
		}
	}
}

void analogix_dp_get_lane_count(struct analogix_dp_device *dp, u32 *count)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_LANE_COUNT_SET);
	*count = reg;
}

struct swing_pre_emp_ctrl {
	u8 amp;
	u8 emp;
};

static const struct swing_pre_emp_ctrl swing_pre_emp_ctrl_rbr[4][4] = {
	/* voltage swing 0, pre-emphasis 0->3 */
	{
		{ .amp = 0x50, .emp = 0x00 },
		{ .amp = 0x6c, .emp = 0x28 },
		{ .amp = 0x80, .emp = 0x60 },
		{ .amp = 0xb0, .emp = 0xc4 },
	},
	/* voltage swing 1, pre-emphasis 0->3 */
	{
		{ .amp = 0x78, .emp = 0x00 },
		{ .amp = 0xa4, .emp = 0x50 },
		{ .amp = 0xcc, .emp = 0xa6 },
	},
	/* voltage swing 2, pre-emphasis 0->3 */
	{
		{ .amp = 0xa0, .emp = 0x00 },
		{ .amp = 0xe4, .emp = 0x72 },
	},
	/* voltage swing 3, pre-emphasis 0->3 */
	{
		{ .amp = 0xf0, .emp = 0x00 },
	},
};

static const struct swing_pre_emp_ctrl swing_pre_emp_ctrl_hbr[4][4] = {
	/* voltage swing 0, pre-emphasis 0->3 */
	{
		{ .amp = 0x50, .emp = 0x00 },
		{ .amp = 0x6c, .emp = 0x34 },
		{ .amp = 0x80, .emp = 0x64 },
		{ .amp = 0xb8, .emp = 0xdc },
	},
	/* voltage swing 1, pre-emphasis 0->3 */
	{
		{ .amp = 0x78, .emp = 0x00 },
		{ .amp = 0xa8, .emp = 0x58 },
		{ .amp = 0xcc, .emp = 0xa8 },
	},
	/* voltage swing 2, pre-emphasis 0->3 */
	{
		{ .amp = 0xa0, .emp = 0x00 },
		{ .amp = 0xdd, .emp = 0x74 },
	},
	/* voltage swing 3, pre-emphasis 0->3 */
	{
		{ .amp = 0xf0, .emp = 0x00 },
	},
};

static const struct swing_pre_emp_ctrl swing_pre_emp_ctrl_hbr2[4][4] = {
	/* voltage swing 0, pre-emphasis 0->3 */
	{
		{ .amp = 0x64, .emp = 0x1c },
		{ .amp = 0x90, .emp = 0x78 },
		{ .amp = 0xc4, .emp = 0xe0 },
		{ .amp = 0xa0, .emp = 0xa0 },
	},
	/* voltage swing 1, pre-emphasis 0->3 */
	{
		{ .amp = 0x9c, .emp = 0x3c },
		{ .amp = 0xe8, .emp = 0xd0 },
		{ .amp = 0xb4, .emp = 0x78 },
	},
	/* voltage swing 2, pre-emphasis 0->3 */
	{
		{ .amp = 0xe0, .emp = 0x68 },
		{ .amp = 0xe8, .emp = 0xd0 },
	},
	/* voltage swing 3, pre-emphasis 0->3 */
	{
		{ .amp = 0xf0, .emp = 0x00 },
	},
};

void analogix_dp_set_lane_link_training(struct analogix_dp_device *dp)
{
	u8 lane;
	int ret;

	for (lane = 0; lane < dp->link_train.lane_count; lane++)
		analogix_dp_write(dp,
				  ANALOGIX_DP_LN0_LINK_TRAINING_CTL + 4 * lane,
				  dp->link_train.training_lane[lane]);

	if (dp->phy) {
		union phy_configure_opts phy_cfg;

		for (lane = 0; lane < dp->link_train.lane_count; lane++) {
			u8 training_lane = dp->link_train.training_lane[lane];
			u8 vs, pe;

			vs = (training_lane & DP_TRAIN_VOLTAGE_SWING_MASK) >>
			     DP_TRAIN_VOLTAGE_SWING_SHIFT;
			pe = (training_lane & DP_TRAIN_PRE_EMPHASIS_MASK) >>
			     DP_TRAIN_PRE_EMPHASIS_SHIFT;
			phy_cfg.dp.voltage[lane] = vs;
			phy_cfg.dp.pre[lane] = pe;
		}

		phy_cfg.dp.lanes = dp->link_train.lane_count;
		phy_cfg.dp.set_lanes = false;
		phy_cfg.dp.set_rate = false;
		phy_cfg.dp.set_voltages = true;
		ret = phy_configure(dp->phy, &phy_cfg);
		if (ret && ret != -EOPNOTSUPP) {
			dev_err(dp->dev, "%s: phy_configure() failed: %d\n",
				__func__, ret);
			return;
		}
	} else {
		const struct swing_pre_emp_ctrl *ctrl;

		for (lane = 0; lane < dp->link_train.lane_count; lane++) {
			u8 training_lane = dp->link_train.training_lane[lane];
			u8 vs, pe;
			u32 reg;

			vs = (training_lane & DP_TRAIN_VOLTAGE_SWING_MASK) >>
			     DP_TRAIN_VOLTAGE_SWING_SHIFT;
			pe = (training_lane & DP_TRAIN_PRE_EMPHASIS_MASK) >>
			     DP_TRAIN_PRE_EMPHASIS_SHIFT;

			switch (dp->link_train.link_rate) {
			case DP_LINK_BW_1_62:
				ctrl = &swing_pre_emp_ctrl_rbr[vs][pe];
				break;
			case DP_LINK_BW_2_7:
				ctrl = &swing_pre_emp_ctrl_hbr[vs][pe];
				break;
			case DP_LINK_BW_5_4:
			default:
				ctrl = &swing_pre_emp_ctrl_hbr2[vs][pe];
				break;
			}

			switch (lane) {
			case 0:
				reg = analogix_dp_read(dp, ANALOGIX_DP_ANALOG_CTL_42);
				reg |= R_FORCE_CH0_AMP | R_FORCE_CH0_EMP;
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_42, reg);
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_36, ctrl->amp);
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_37, ctrl->emp);
				break;
			case 1:
				reg = analogix_dp_read(dp, ANALOGIX_DP_ANALOG_CTL_42);
				reg |= R_FORCE_CH1_AMP | R_FORCE_CH1_EMP;
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_42, reg);
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_39, ctrl->amp);
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_40, ctrl->emp);
				break;
			case 2:
				reg = analogix_dp_read(dp, ANALOGIX_DP_ANALOG_CTL_49);
				reg |= R_FORCE_CH2_AMP | R_FORCE_CH2_EMP;
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_49, reg);
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_43, ctrl->amp);
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_44, ctrl->emp);
				break;
			case 3:
				reg = analogix_dp_read(dp, ANALOGIX_DP_ANALOG_CTL_49);
				reg |= R_FORCE_CH3_AMP | R_FORCE_CH3_EMP;
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_49, reg);
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_46, ctrl->amp);
				analogix_dp_write(dp, ANALOGIX_DP_ANALOG_CTL_47, ctrl->emp);
				break;
			}
		}
	}
}

u32 analogix_dp_get_lane_link_training(struct analogix_dp_device *dp, u8 lane)
{
	return analogix_dp_read(dp,
				ANALOGIX_DP_LN0_LINK_TRAINING_CTL + 4 * lane);
}

void analogix_dp_enable_enhanced_mode(struct analogix_dp_device *dp,
				      bool enable)
{
	u32 reg;

	if (enable) {
		reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_4);
		reg |= ENHANCED;
		analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_4, reg);
	} else {
		reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_4);
		reg &= ~ENHANCED;
		analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_4, reg);
	}
}

void analogix_dp_set_training_pattern(struct analogix_dp_device *dp,
				      enum pattern_set pattern)
{
	u32 reg;

	switch (pattern) {
	case PRBS7:
		reg = SCRAMBLING_ENABLE | LINK_QUAL_PATTERN_SET_PRBS7;
		analogix_dp_write(dp, ANALOGIX_DP_TRAINING_PTN_SET, reg);
		break;
	case D10_2:
		reg = SCRAMBLING_ENABLE | LINK_QUAL_PATTERN_SET_D10_2;
		analogix_dp_write(dp, ANALOGIX_DP_TRAINING_PTN_SET, reg);
		break;
	case TRAINING_PTN1:
		reg = SCRAMBLING_DISABLE | SW_TRAINING_PATTERN_SET_PTN1;
		analogix_dp_write(dp, ANALOGIX_DP_TRAINING_PTN_SET, reg);
		break;
	case TRAINING_PTN2:
		reg = SCRAMBLING_DISABLE | SW_TRAINING_PATTERN_SET_PTN2;
		analogix_dp_write(dp, ANALOGIX_DP_TRAINING_PTN_SET, reg);
		break;
	case TRAINING_PTN3:
		reg = SCRAMBLING_DISABLE | SW_TRAINING_PATTERN_SET_PTN3;
		analogix_dp_write(dp, ANALOGIX_DP_TRAINING_PTN_SET, reg);
		break;
	case DP_NONE:
		reg = SCRAMBLING_ENABLE |
			LINK_QUAL_PATTERN_SET_DISABLE |
			SW_TRAINING_PATTERN_SET_NORMAL;
		analogix_dp_write(dp, ANALOGIX_DP_TRAINING_PTN_SET, reg);
		break;
	default:
		break;
	}
}

void analogix_dp_reset_macro(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_PHY_TEST);
	reg |= MACRO_RST;
	analogix_dp_write(dp, ANALOGIX_DP_PHY_TEST, reg);

	/* 10 us is the minimum reset time. */
	usleep_range(10, 20);

	reg &= ~MACRO_RST;
	analogix_dp_write(dp, ANALOGIX_DP_PHY_TEST, reg);
}

void analogix_dp_init_video(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = VSYNC_DET | VID_FORMAT_CHG | VID_CLK_CHG;
	analogix_dp_write(dp, ANALOGIX_DP_COMMON_INT_STA_1, reg);

	reg = 0x0;
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_1, reg);

	reg = CHA_CRI(4) | CHA_CTRL;
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_2, reg);

	reg = 0x0;
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_3, reg);

	reg = VID_HRES_TH(2) | VID_VRES_TH(0);
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_8, reg);
}

void analogix_dp_set_video_color_format(struct analogix_dp_device *dp)
{
	u32 reg;

	/* Configure the input color depth, color space, dynamic range */
	reg = (dp->video_info.dynamic_range << IN_D_RANGE_SHIFT) |
		(dp->video_info.color_depth << IN_BPC_SHIFT) |
		(dp->video_info.color_space << IN_COLOR_F_SHIFT);
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_2, reg);

	/* Set Input Color YCbCr Coefficients to ITU601 or ITU709 */
	reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_3);
	reg &= ~IN_YC_COEFFI_MASK;
	if (dp->video_info.ycbcr_coeff)
		reg |= IN_YC_COEFFI_ITU709;
	else
		reg |= IN_YC_COEFFI_ITU601;
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_3, reg);
}

int analogix_dp_is_slave_video_stream_clock_on(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_1);
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_1, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_1);

	if (!(reg & DET_STA)) {
		dev_dbg(dp->dev, "Input stream clock not detected.\n");
		return -EINVAL;
	}

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_2);
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_2, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_2);
	dev_dbg(dp->dev, "wait SYS_CTL_2.\n");

	if (reg & CHA_STA) {
		dev_dbg(dp->dev, "Input stream clk is changing\n");
		return -EINVAL;
	}

	return 0;
}

void analogix_dp_set_video_cr_mn(struct analogix_dp_device *dp,
				 enum clock_recovery_m_value_type type,
				 u32 m_value, u32 n_value)
{
	u32 reg;

	if (type == REGISTER_M) {
		reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_4);
		reg |= FIX_M_VID;
		analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_4, reg);
		reg = m_value & 0xff;
		analogix_dp_write(dp, ANALOGIX_DP_M_VID_0, reg);
		reg = (m_value >> 8) & 0xff;
		analogix_dp_write(dp, ANALOGIX_DP_M_VID_1, reg);
		reg = (m_value >> 16) & 0xff;
		analogix_dp_write(dp, ANALOGIX_DP_M_VID_2, reg);

		reg = n_value & 0xff;
		analogix_dp_write(dp, ANALOGIX_DP_N_VID_0, reg);
		reg = (n_value >> 8) & 0xff;
		analogix_dp_write(dp, ANALOGIX_DP_N_VID_1, reg);
		reg = (n_value >> 16) & 0xff;
		analogix_dp_write(dp, ANALOGIX_DP_N_VID_2, reg);
	} else  {
		reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_4);
		reg &= ~FIX_M_VID;
		analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_4, reg);

		analogix_dp_write(dp, ANALOGIX_DP_N_VID_0, 0x00);
		analogix_dp_write(dp, ANALOGIX_DP_N_VID_1, 0x80);
		analogix_dp_write(dp, ANALOGIX_DP_N_VID_2, 0x00);
	}
}

void analogix_dp_set_video_timing_mode(struct analogix_dp_device *dp, u32 type)
{
	u32 reg;

	if (type == VIDEO_TIMING_FROM_CAPTURE) {
		reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_10);
		reg &= ~FORMAT_SEL;
		analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_10, reg);
	} else {
		reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_10);
		reg |= FORMAT_SEL;
		analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_10, reg);
	}
}

void analogix_dp_enable_video_master(struct analogix_dp_device *dp, bool enable)
{
	u32 reg;

	if (enable) {
		reg = analogix_dp_read(dp, ANALOGIX_DP_SOC_GENERAL_CTL);
		reg &= ~VIDEO_MODE_MASK;
		reg |= VIDEO_MASTER_MODE_EN | VIDEO_MODE_MASTER_MODE;
		analogix_dp_write(dp, ANALOGIX_DP_SOC_GENERAL_CTL, reg);
	} else {
		reg = analogix_dp_read(dp, ANALOGIX_DP_SOC_GENERAL_CTL);
		reg &= ~VIDEO_MODE_MASK;
		reg |= VIDEO_MODE_SLAVE_MODE;
		analogix_dp_write(dp, ANALOGIX_DP_SOC_GENERAL_CTL, reg);
	}
}

void analogix_dp_start_video(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_1);
	reg |= VIDEO_EN;
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_1, reg);
}

int analogix_dp_is_video_stream_on(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_3);
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_3, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_3);
	if (!(reg & STRM_VALID)) {
		dev_dbg(dp->dev, "Input video stream is not detected.\n");
		return -EINVAL;
	}

	return 0;
}

void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_FUNC_EN_1);
	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type)) {
		reg &= ~(RK_VID_CAP_FUNC_EN_N | RK_VID_FIFO_FUNC_EN_N);
	} else {
		reg &= ~(MASTER_VID_FUNC_EN_N | SLAVE_VID_FUNC_EN_N);
		reg |= MASTER_VID_FUNC_EN_N;
	}
	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_1, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_10);
	reg &= ~INTERACE_SCAN_CFG;
	reg |= (dp->video_info.interlaced << 2);
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_10, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_10);
	reg &= ~VSYNC_POLARITY_CFG;
	reg |= (dp->video_info.v_sync_polarity << 1);
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_10, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_10);
	reg &= ~HSYNC_POLARITY_CFG;
	reg |= (dp->video_info.h_sync_polarity << 0);
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_10, reg);

	reg = AUDIO_MODE_SPDIF_MODE | VIDEO_MODE_SLAVE_MODE;
	analogix_dp_write(dp, ANALOGIX_DP_SOC_GENERAL_CTL, reg);
}

void analogix_dp_enable_scrambling(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_TRAINING_PTN_SET);
	reg &= ~SCRAMBLING_DISABLE;
	analogix_dp_write(dp, ANALOGIX_DP_TRAINING_PTN_SET, reg);
}

void analogix_dp_disable_scrambling(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_TRAINING_PTN_SET);
	reg |= SCRAMBLING_DISABLE;
	analogix_dp_write(dp, ANALOGIX_DP_TRAINING_PTN_SET, reg);
}

void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp)
{
	analogix_dp_write(dp, ANALOGIX_DP_CRC_CON, PSR_VID_CRC_ENABLE);
}

static ssize_t analogix_dp_get_psr_status(struct analogix_dp_device *dp)
{
	ssize_t val;
	u8 status;

	val = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &status);
	if (val < 0) {
		dev_err(dp->dev, "PSR_STATUS read failed ret=%zd", val);
		return val;
	}
	return status;
}

int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
			     struct edp_vsc_psr *vsc, bool blocking)
{
	unsigned int val;
	int ret;
	ssize_t psr_status;

	/* don't send info frame */
	val = analogix_dp_read(dp, ANALOGIX_DP_PKT_SEND_CTL);
	val &= ~IF_EN;
	analogix_dp_write(dp, ANALOGIX_DP_PKT_SEND_CTL, val);

	/* configure single frame update mode */
	analogix_dp_write(dp, ANALOGIX_DP_PSR_FRAME_UPDATE_CTRL,
			  PSR_FRAME_UP_TYPE_BURST | PSR_CRC_SEL_HARDWARE);

	/* configure VSC HB0~HB3 */
	analogix_dp_write(dp, ANALOGIX_DP_SPD_HB0, vsc->sdp_header.HB0);
	analogix_dp_write(dp, ANALOGIX_DP_SPD_HB1, vsc->sdp_header.HB1);
	analogix_dp_write(dp, ANALOGIX_DP_SPD_HB2, vsc->sdp_header.HB2);
	analogix_dp_write(dp, ANALOGIX_DP_SPD_HB3, vsc->sdp_header.HB3);

	/* configure reused VSC PB0~PB3, magic number from vendor */
	analogix_dp_write(dp, ANALOGIX_DP_SPD_PB0, 0x00);
	analogix_dp_write(dp, ANALOGIX_DP_SPD_PB1, 0x16);
	analogix_dp_write(dp, ANALOGIX_DP_SPD_PB2, 0xCE);
	analogix_dp_write(dp, ANALOGIX_DP_SPD_PB3, 0x5D);

	/* configure DB0 / DB1 values */
	analogix_dp_write(dp, ANALOGIX_DP_VSC_SHADOW_DB0, vsc->DB0);
	analogix_dp_write(dp, ANALOGIX_DP_VSC_SHADOW_DB1, vsc->DB1);

	/* set reuse spd inforframe */
	val = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_3);
	val |= REUSE_SPD_EN;
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_3, val);

	/* mark info frame update */
	val = analogix_dp_read(dp, ANALOGIX_DP_PKT_SEND_CTL);
	val = (val | IF_UP) & ~IF_EN;
	analogix_dp_write(dp, ANALOGIX_DP_PKT_SEND_CTL, val);

	/* send info frame */
	val = analogix_dp_read(dp, ANALOGIX_DP_PKT_SEND_CTL);
	val |= IF_EN;
	analogix_dp_write(dp, ANALOGIX_DP_PKT_SEND_CTL, val);

	if (!blocking)
		return 0;

	ret = readx_poll_timeout(analogix_dp_get_psr_status, dp, psr_status,
		psr_status >= 0 &&
		((vsc->DB1 && psr_status == DP_PSR_SINK_ACTIVE_RFB) ||
		(!vsc->DB1 && psr_status == DP_PSR_SINK_INACTIVE)), 1500,
		DP_TIMEOUT_PSR_LOOP_MS * 1000);
	if (ret) {
		dev_warn(dp->dev, "Failed to apply PSR %d\n", ret);
		return ret;
	}
	return 0;
}

void analogix_dp_phy_power_on(struct analogix_dp_device *dp)
{
	if (dp->phy_enabled)
		return;

	phy_power_on(dp->phy);

	dp->phy_enabled = true;
}

void analogix_dp_phy_power_off(struct analogix_dp_device *dp)
{
	if (!dp->phy_enabled)
		return;

	phy_power_off(dp->phy);

	dp->phy_enabled = false;
}

ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
			     struct drm_dp_aux_msg *msg)
{
	u32 reg;
	u32 status_reg;
	u8 *buffer = msg->buffer;
	unsigned int i;
	int num_transferred = 0;
	int ret;

	/* Buffer size of AUX CH is 16 bytes */
	if (WARN_ON(msg->size > 16))
		return -E2BIG;

	reg = analogix_dp_read(dp, ANALOGIX_DP_FUNC_EN_2);
	if (reg & AUX_FUNC_EN_N) {
		analogix_dp_phy_power_on(dp);
		analogix_dp_init_aux(dp);
	}

	/* Clear AUX CH data buffer */
	reg = BUF_CLR;
	analogix_dp_write(dp, ANALOGIX_DP_BUFFER_DATA_CTL, reg);

	switch (msg->request & ~DP_AUX_I2C_MOT) {
	case DP_AUX_I2C_WRITE:
		reg = AUX_TX_COMM_WRITE | AUX_TX_COMM_I2C_TRANSACTION;
		if (msg->request & DP_AUX_I2C_MOT)
			reg |= AUX_TX_COMM_MOT;
		break;

	case DP_AUX_I2C_READ:
		reg = AUX_TX_COMM_READ | AUX_TX_COMM_I2C_TRANSACTION;
		if (msg->request & DP_AUX_I2C_MOT)
			reg |= AUX_TX_COMM_MOT;
		break;

	case DP_AUX_NATIVE_WRITE:
		reg = AUX_TX_COMM_WRITE | AUX_TX_COMM_DP_TRANSACTION;
		break;

	case DP_AUX_NATIVE_READ:
		reg = AUX_TX_COMM_READ | AUX_TX_COMM_DP_TRANSACTION;
		break;

	default:
		return -EINVAL;
	}

	reg |= AUX_LENGTH(msg->size);
	analogix_dp_write(dp, ANALOGIX_DP_AUX_CH_CTL_1, reg);

	/* Select DPCD device address */
	reg = AUX_ADDR_7_0(msg->address);
	analogix_dp_write(dp, ANALOGIX_DP_AUX_ADDR_7_0, reg);
	reg = AUX_ADDR_15_8(msg->address);
	analogix_dp_write(dp, ANALOGIX_DP_AUX_ADDR_15_8, reg);
	reg = AUX_ADDR_19_16(msg->address);
	analogix_dp_write(dp, ANALOGIX_DP_AUX_ADDR_19_16, reg);

	if (!(msg->request & DP_AUX_I2C_READ)) {
		for (i = 0; i < msg->size; i++) {
			reg = buffer[i];
			analogix_dp_write(dp, ANALOGIX_DP_BUF_DATA_0 + 4 * i,
					  reg);
			num_transferred++;
		}
	}

	/* Enable AUX CH operation */
	reg = AUX_EN;

	/* Zero-sized messages specify address-only transactions. */
	if (msg->size < 1)
		reg |= ADDR_ONLY;

	analogix_dp_write(dp, ANALOGIX_DP_AUX_CH_CTL_2, reg);

	ret = readx_poll_timeout(readl, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2,
				 reg, !(reg & AUX_EN), 25, 500 * 1000);
	if (ret) {
		dev_err(dp->dev, "AUX CH enable timeout!\n");
		goto aux_error;
	}

	/* TODO: Wait for an interrupt instead of looping? */
	/* Is AUX CH command reply received? */
	ret = readx_poll_timeout(readl, dp->reg_base + ANALOGIX_DP_INT_STA,
				 reg, reg & RPLY_RECEIV, 10, 20 * 1000);
	if (ret) {
		dev_err(dp->dev, "AUX CH cmd reply timeout!\n");
		goto aux_error;
	}

	/* Clear interrupt source for AUX CH command reply */
	analogix_dp_write(dp, ANALOGIX_DP_INT_STA, RPLY_RECEIV);

	/* Clear interrupt source for AUX CH access error */
	reg = analogix_dp_read(dp, ANALOGIX_DP_INT_STA);
	status_reg = analogix_dp_read(dp, ANALOGIX_DP_AUX_CH_STA);
	if ((reg & AUX_ERR) || (status_reg & AUX_STATUS_MASK)) {
		analogix_dp_write(dp, ANALOGIX_DP_INT_STA, AUX_ERR);

		dev_warn(dp->dev, "AUX CH error happened: %#x (%d)\n",
			 status_reg & AUX_STATUS_MASK, !!(reg & AUX_ERR));
		goto aux_error;
	}

	if (msg->request & DP_AUX_I2C_READ) {
		for (i = 0; i < msg->size; i++) {
			reg = analogix_dp_read(dp, ANALOGIX_DP_BUF_DATA_0 +
					       4 * i);
			buffer[i] = (unsigned char)reg;
			num_transferred++;
		}
	}

	/* Check if Rx sends defer */
	reg = analogix_dp_read(dp, ANALOGIX_DP_AUX_RX_COMM);
	if (reg == AUX_RX_COMM_AUX_DEFER)
		msg->reply = DP_AUX_NATIVE_REPLY_DEFER;
	else if (reg == AUX_RX_COMM_I2C_DEFER)
		msg->reply = DP_AUX_I2C_REPLY_DEFER;
	else if ((msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_I2C_WRITE ||
		 (msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_I2C_READ)
		msg->reply = DP_AUX_I2C_REPLY_ACK;
	else if ((msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_NATIVE_WRITE ||
		 (msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_NATIVE_READ)
		msg->reply = DP_AUX_NATIVE_REPLY_ACK;

	return (num_transferred == msg->size) ? num_transferred : -EBUSY;

aux_error:
	/* if aux err happen, reset aux */
	analogix_dp_init_aux(dp);

	return -EREMOTEIO;
}

void analogix_dp_set_video_format(struct analogix_dp_device *dp)
{
	struct video_info *video = &dp->video_info;
	const struct drm_display_mode *mode = &video->mode;
	unsigned int hsw, hfp, hbp, vsw, vfp, vbp;

	hsw = mode->hsync_end - mode->hsync_start;
	hfp = mode->hsync_start - mode->hdisplay;
	hbp = mode->htotal - mode->hsync_end;
	vsw = mode->vsync_end - mode->vsync_start;
	vfp = mode->vsync_start - mode->vdisplay;
	vbp = mode->vtotal - mode->vsync_end;

	/* Set Video Format Parameters */
	analogix_dp_write(dp, ANALOGIX_DP_TOTAL_LINE_CFG_L,
			  TOTAL_LINE_CFG_L(mode->vtotal));
	analogix_dp_write(dp, ANALOGIX_DP_TOTAL_LINE_CFG_H,
			  TOTAL_LINE_CFG_H(mode->vtotal >> 8));
	analogix_dp_write(dp, ANALOGIX_DP_ACTIVE_LINE_CFG_L,
			  ACTIVE_LINE_CFG_L(mode->vdisplay));
	analogix_dp_write(dp, ANALOGIX_DP_ACTIVE_LINE_CFG_H,
			  ACTIVE_LINE_CFG_H(mode->vdisplay >> 8));
	analogix_dp_write(dp, ANALOGIX_DP_V_F_PORCH_CFG,
			  V_F_PORCH_CFG(vfp));
	analogix_dp_write(dp, ANALOGIX_DP_V_SYNC_WIDTH_CFG,
			  V_SYNC_WIDTH_CFG(vsw));
	analogix_dp_write(dp, ANALOGIX_DP_V_B_PORCH_CFG,
			  V_B_PORCH_CFG(vbp));
	analogix_dp_write(dp, ANALOGIX_DP_TOTAL_PIXEL_CFG_L,
			  TOTAL_PIXEL_CFG_L(mode->htotal));
	analogix_dp_write(dp, ANALOGIX_DP_TOTAL_PIXEL_CFG_H,
			  TOTAL_PIXEL_CFG_H(mode->htotal >> 8));
	analogix_dp_write(dp, ANALOGIX_DP_ACTIVE_PIXEL_CFG_L,
			  ACTIVE_PIXEL_CFG_L(mode->hdisplay));
	analogix_dp_write(dp, ANALOGIX_DP_ACTIVE_PIXEL_CFG_H,
			  ACTIVE_PIXEL_CFG_H(mode->hdisplay >> 8));
	analogix_dp_write(dp, ANALOGIX_DP_H_F_PORCH_CFG_L,
			  H_F_PORCH_CFG_L(hfp));
	analogix_dp_write(dp, ANALOGIX_DP_H_F_PORCH_CFG_H,
			  H_F_PORCH_CFG_H(hfp >> 8));
	analogix_dp_write(dp, ANALOGIX_DP_H_SYNC_CFG_L,
			  H_SYNC_CFG_L(hsw));
	analogix_dp_write(dp, ANALOGIX_DP_H_SYNC_CFG_H,
			  H_SYNC_CFG_H(hsw >> 8));
	analogix_dp_write(dp, ANALOGIX_DP_H_B_PORCH_CFG_L,
			  H_B_PORCH_CFG_L(hbp));
	analogix_dp_write(dp, ANALOGIX_DP_H_B_PORCH_CFG_H,
			  H_B_PORCH_CFG_H(hbp >> 8));
}

void analogix_dp_video_bist_enable(struct analogix_dp_device *dp)
{
	u32 reg;

	/* Enable Video BIST */
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_4, BIST_EN);

	/*
	 * Note that if BIST_EN is set to 1, F_SEL must be cleared to 0
	 * although video format information comes from registers set by user.
	 */
	reg = analogix_dp_read(dp, ANALOGIX_DP_VIDEO_CTL_10);
	reg &= ~FORMAT_SEL;
	analogix_dp_write(dp, ANALOGIX_DP_VIDEO_CTL_10, reg);
}

void analogix_dp_audio_config_i2s(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_4);
	reg &= ~FIX_M_AUD;
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_4, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_I2S_CTRL);
	reg |= I2S_EN;
	analogix_dp_write(dp, ANALOGIX_DP_I2S_CTRL, reg);
}

void analogix_dp_audio_config_spdif(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_SYS_CTL_4);
	reg &= ~FIX_M_AUD;
	analogix_dp_write(dp, ANALOGIX_DP_SYS_CTL_4, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_SPDIF_AUDIO_CTL_0);
	reg |= AUD_SPDIF_EN;
	analogix_dp_write(dp, ANALOGIX_DP_SPDIF_AUDIO_CTL_0, reg);
}

void analogix_dp_audio_enable(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = analogix_dp_read(dp, ANALOGIX_DP_FUNC_EN_1);
	reg &= ~(AUD_FIFO_FUNC_EN_N | AUD_FUNC_EN_N);
	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_1, reg);

	reg = analogix_dp_read(dp, ANALOGIX_DP_AUD_CTL);
	reg |= MISC_CTRL_RESET | DP_AUDIO_EN;
	analogix_dp_write(dp, ANALOGIX_DP_AUD_CTL, reg);
}

void analogix_dp_audio_disable(struct analogix_dp_device *dp)
{
	u32 reg;

	analogix_dp_write(dp, ANALOGIX_DP_AUD_CTL, 0);

	reg = analogix_dp_read(dp, ANALOGIX_DP_FUNC_EN_1);
	reg |= AUD_FIFO_FUNC_EN_N | AUD_FUNC_EN_N;
	analogix_dp_write(dp, ANALOGIX_DP_FUNC_EN_1, reg);
}