treewide: remove redundant IS_ERR() before error code check

[linux/fpc-iii.git] / drivers / gpu / drm / bridge / analogix / analogix_dp_reg.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Analogix DP (Display port) core register interface driver.
 *
 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
 * Author: Jingoo Han <jg1.han@samsung.com>
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/iopoll.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)
#define INT_STA_MASK            INT_HPD

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

        if (enable) {
                reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
                reg |= HDCP_VIDEO_MUTE;
                writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
        } else {
                reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
                reg &= ~HDCP_VIDEO_MUTE;
                writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
        }
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
        reg &= ~VIDEO_EN;
        writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
}

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;

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

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

        reg = TX_TERMINAL_CTRL_50_OHM;
        writel(reg, dp->reg_base + ANALOGIX_DP_ANALOG_CTL_1);

        reg = SEL_24M | TX_DVDD_BIT_1_0625V;
        writel(reg, dp->reg_base + ANALOGIX_DP_ANALOG_CTL_2);

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

                writel(reg, dp->reg_base + ANALOGIX_DP_PLL_REG_1);
                writel(0x95, dp->reg_base + ANALOGIX_DP_PLL_REG_2);
                writel(0x40, dp->reg_base + ANALOGIX_DP_PLL_REG_3);
                writel(0x58, dp->reg_base + ANALOGIX_DP_PLL_REG_4);
                writel(0x22, dp->reg_base + ANALOGIX_DP_PLL_REG_5);
        }

        reg = DRIVE_DVDD_BIT_1_0625V | VCO_BIT_600_MICRO;
        writel(reg, dp->reg_base + ANALOGIX_DP_ANALOG_CTL_3);

        reg = PD_RING_OSC | AUX_TERMINAL_CTRL_50_OHM |
                TX_CUR1_2X | TX_CUR_16_MA;
        writel(reg, dp->reg_base + ANALOGIX_DP_PLL_FILTER_CTL_1);

        reg = CH3_AMP_400_MV | CH2_AMP_400_MV |
                CH1_AMP_400_MV | CH0_AMP_400_MV;
        writel(reg, dp->reg_base + ANALOGIX_DP_TX_AMP_TUNING_CTL);
}

void analogix_dp_init_interrupt(struct analogix_dp_device *dp)
{
        /* Set interrupt pin assertion polarity as high */
        writel(INT_POL1 | INT_POL0, dp->reg_base + ANALOGIX_DP_INT_CTL);

        /* Clear pending regisers */
        writel(0xff, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_1);
        writel(0x4f, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_2);
        writel(0xe0, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_3);
        writel(0xe7, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_4);
        writel(0x63, dp->reg_base + ANALOGIX_DP_INT_STA);

        /* 0:mask,1: unmask */
        writel(0x00, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_1);
        writel(0x00, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_2);
        writel(0x00, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_3);
        writel(0x00, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_4);
        writel(0x00, dp->reg_base + ANALOGIX_DP_INT_STA_MASK);
}

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;

        writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_1);

        reg = SSC_FUNC_EN_N | AUX_FUNC_EN_N |
                SERDES_FIFO_FUNC_EN_N |
                LS_CLK_DOMAIN_FUNC_EN_N;
        writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_2);

        usleep_range(20, 30);

        analogix_dp_lane_swap(dp, 0);

        writel(0x0, dp->reg_base + ANALOGIX_DP_SYS_CTL_1);
        writel(0x40, dp->reg_base + ANALOGIX_DP_SYS_CTL_2);
        writel(0x0, dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
        writel(0x0, dp->reg_base + ANALOGIX_DP_SYS_CTL_4);

        writel(0x0, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
        writel(0x0, dp->reg_base + ANALOGIX_DP_HDCP_CTL);

        writel(0x5e, dp->reg_base + ANALOGIX_DP_HPD_DEGLITCH_L);
        writel(0x1a, dp->reg_base + ANALOGIX_DP_HPD_DEGLITCH_H);

        writel(0x10, dp->reg_base + ANALOGIX_DP_LINK_DEBUG_CTL);

        writel(0x0, dp->reg_base + ANALOGIX_DP_PHY_TEST);

        writel(0x0, dp->reg_base + ANALOGIX_DP_VIDEO_FIFO_THRD);
        writel(0x20, dp->reg_base + ANALOGIX_DP_AUDIO_MARGIN);

        writel(0x4, dp->reg_base + ANALOGIX_DP_M_VID_GEN_FILTER_TH);
        writel(0x2, dp->reg_base + ANALOGIX_DP_M_AUD_GEN_FILTER_TH);

        writel(0x00000101, dp->reg_base + ANALOGIX_DP_SOC_GENERAL_CTL);
}

void analogix_dp_swreset(struct analogix_dp_device *dp)
{
        writel(RESET_DP_TX, dp->reg_base + ANALOGIX_DP_TX_SW_RESET);
}

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

        /* 0: mask, 1: unmask */
        reg = COMMON_INT_MASK_1;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_1);

        reg = COMMON_INT_MASK_2;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_2);

        reg = COMMON_INT_MASK_3;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_3);

        reg = COMMON_INT_MASK_4;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_4);

        reg = INT_STA_MASK;
        writel(reg, dp->reg_base + ANALOGIX_DP_INT_STA_MASK);
}

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

        /* 0: mask, 1: unmask */
        reg = readl(dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_4);
        reg &= ~COMMON_INT_MASK_4;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_4);

        reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA_MASK);
        reg &= ~INT_STA_MASK;
        writel(reg, dp->reg_base + ANALOGIX_DP_INT_STA_MASK);
}

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

        /* 0: mask, 1: unmask */
        reg = COMMON_INT_MASK_4;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_4);

        reg = INT_STA_MASK;
        writel(reg, dp->reg_base + ANALOGIX_DP_INT_STA_MASK);
}

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

        reg = readl(dp->reg_base + 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 = readl(dp->reg_base + pd_addr);
        if (enable)
                reg |= mask;
        else
                reg &= ~mask;
        writel(reg, dp->reg_base + pd_addr);
}

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 = readl(dp->reg_base + phy_pd_addr);
                if (enable)
                        reg |= mask;
                else
                        reg &= ~mask;
                writel(reg, dp->reg_base + phy_pd_addr);
                break;
        case CH0_BLOCK:
                mask = CH0_PD;
                reg = readl(dp->reg_base + phy_pd_addr);

                if (enable)
                        reg |= mask;
                else
                        reg &= ~mask;
                writel(reg, dp->reg_base + phy_pd_addr);
                break;
        case CH1_BLOCK:
                mask = CH1_PD;
                reg = readl(dp->reg_base + phy_pd_addr);

                if (enable)
                        reg |= mask;
                else
                        reg &= ~mask;
                writel(reg, dp->reg_base + phy_pd_addr);
                break;
        case CH2_BLOCK:
                mask = CH2_PD;
                reg = readl(dp->reg_base + phy_pd_addr);

                if (enable)
                        reg |= mask;
                else
                        reg &= ~mask;
                writel(reg, dp->reg_base + phy_pd_addr);
                break;
        case CH3_BLOCK:
                mask = CH3_PD;
                reg = readl(dp->reg_base + phy_pd_addr);

                if (enable)
                        reg |= mask;
                else
                        reg &= ~mask;
                writel(reg, dp->reg_base + phy_pd_addr);
                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 = readl(dp->reg_base + phy_pd_addr);
                if (enable)
                        reg |= mask;
                else
                        reg &= ~mask;

                writel(reg, dp->reg_base + phy_pd_addr);
                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;
                        writel(reg, dp->reg_base + phy_pd_addr);
                } else {
                        reg = DP_ALL_PD;
                        writel(reg, dp->reg_base + phy_pd_addr);
                        usleep_range(10, 15);
                        reg &= ~DP_INC_BG;
                        writel(reg, dp->reg_base + phy_pd_addr);
                        usleep_range(10, 15);

                        writel(0x00, dp->reg_base + phy_pd_addr);
                }
                break;
        default:
                break;
        }
}

int analogix_dp_init_analog_func(struct analogix_dp_device *dp)
{
        u32 reg;
        int timeout_loop = 0;

        analogix_dp_set_analog_power_down(dp, POWER_ALL, 0);

        reg = PLL_LOCK_CHG;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_1);

        reg = readl(dp->reg_base + ANALOGIX_DP_DEBUG_CTL);
        reg &= ~(F_PLL_LOCK | PLL_LOCK_CTRL);
        writel(reg, dp->reg_base + ANALOGIX_DP_DEBUG_CTL);

        /* Power up PLL */
        if (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
                analogix_dp_set_pll_power_down(dp, 0);

                while (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
                        timeout_loop++;
                        if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
                                dev_err(dp->dev, "failed to get pll lock status\n");
                                return -ETIMEDOUT;
                        }
                        usleep_range(10, 20);
                }
        }

        /* Enable Serdes FIFO function and Link symbol clock domain module */
        reg = readl(dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
        reg &= ~(SERDES_FIFO_FUNC_EN_N | LS_CLK_DOMAIN_FUNC_EN_N
                | AUX_FUNC_EN_N);
        writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
        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;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_4);

        reg = INT_HPD;
        writel(reg, dp->reg_base + ANALOGIX_DP_INT_STA);
}

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

        if (dp->hpd_gpiod)
                return;

        analogix_dp_clear_hotplug_interrupts(dp);

        reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
        reg &= ~(F_HPD | HPD_CTRL);
        writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
        reg = (F_HPD | HPD_CTRL);
        writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
}

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

        if (dp->hpd_gpiod) {
                reg = gpiod_get_value(dp->hpd_gpiod);
                if (reg)
                        return DP_IRQ_TYPE_HP_CABLE_IN;
                else
                        return DP_IRQ_TYPE_HP_CABLE_OUT;
        } else {
                /* Parse hotplug interrupt status register */
                reg = readl(dp->reg_base + 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 = readl(dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
        reg |= AUX_FUNC_EN_N;
        writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
}

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

        /* Clear inerrupts related to AUX channel */
        reg = RPLY_RECEIV | AUX_ERR;
        writel(reg, dp->reg_base + ANALOGIX_DP_INT_STA);

        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;

        writel(reg, dp->reg_base + ANALOGIX_DP_AUX_HW_RETRY_CTL);

        /* Receive AUX Channel DEFER commands equal to DEFFER_COUNT*64 */
        reg = DEFER_CTRL_EN | DEFER_COUNT(1);
        writel(reg, dp->reg_base + ANALOGIX_DP_AUX_CH_DEFER_CTL);

        /* Enable AUX channel module */
        reg = readl(dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
        reg &= ~AUX_FUNC_EN_N;
        writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
}

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 = readl(dp->reg_base + 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 = readl(dp->reg_base + ANALOGIX_DP_FUNC_EN_1);
        reg &= ~SW_FUNC_EN_N;
        writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_1);
}

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 = readl(dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2);
        reg |= AUX_EN;
        writel(reg, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2);

        /* Is AUX CH command reply received? */
        reg = readl(dp->reg_base + 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 = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
                usleep_range(10, 11);
        }

        /* Clear interrupt source for AUX CH command reply */
        writel(RPLY_RECEIV, dp->reg_base + ANALOGIX_DP_INT_STA);

        /* Clear interrupt source for AUX CH access error */
        reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
        if (reg & AUX_ERR) {
                writel(AUX_ERR, dp->reg_base + ANALOGIX_DP_INT_STA);
                return -EREMOTEIO;
        }

        /* Check AUX CH error access status */
        reg = readl(dp->reg_base + 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;
                writel(reg, dp->reg_base + ANALOGIX_DP_BUFFER_DATA_CTL);

                /* Select DPCD device address */
                reg = AUX_ADDR_7_0(reg_addr);
                writel(reg, dp->reg_base + ANALOGIX_DP_AUX_ADDR_7_0);
                reg = AUX_ADDR_15_8(reg_addr);
                writel(reg, dp->reg_base + ANALOGIX_DP_AUX_ADDR_15_8);
                reg = AUX_ADDR_19_16(reg_addr);
                writel(reg, dp->reg_base + ANALOGIX_DP_AUX_ADDR_19_16);

                /* Write data buffer */
                reg = (unsigned int)data;
                writel(reg, dp->reg_base + ANALOGIX_DP_BUF_DATA_0);

                /*
                 * 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;
                writel(reg, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_1);

                /* 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;
}

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

        reg = bwtype;
        if ((bwtype == DP_LINK_BW_2_7) || (bwtype == DP_LINK_BW_1_62))
                writel(reg, dp->reg_base + ANALOGIX_DP_LINK_BW_SET);
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_LINK_BW_SET);
        *bwtype = reg;
}

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

        reg = count;
        writel(reg, dp->reg_base + ANALOGIX_DP_LANE_COUNT_SET);
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_LANE_COUNT_SET);
        *count = reg;
}

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

        if (enable) {
                reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_4);
                reg |= ENHANCED;
                writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_4);
        } else {
                reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_4);
                reg &= ~ENHANCED;
                writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_4);
        }
}

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;
                writel(reg, dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
                break;
        case D10_2:
                reg = SCRAMBLING_ENABLE | LINK_QUAL_PATTERN_SET_D10_2;
                writel(reg, dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
                break;
        case TRAINING_PTN1:
                reg = SCRAMBLING_DISABLE | SW_TRAINING_PATTERN_SET_PTN1;
                writel(reg, dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
                break;
        case TRAINING_PTN2:
                reg = SCRAMBLING_DISABLE | SW_TRAINING_PATTERN_SET_PTN2;
                writel(reg, dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
                break;
        case DP_NONE:
                reg = SCRAMBLING_ENABLE |
                        LINK_QUAL_PATTERN_SET_DISABLE |
                        SW_TRAINING_PATTERN_SET_NORMAL;
                writel(reg, dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
                break;
        default:
                break;
        }
}

void analogix_dp_set_lane0_pre_emphasis(struct analogix_dp_device *dp,
                                        u32 level)
{
        u32 reg;

        reg = readl(dp->reg_base + ANALOGIX_DP_LN0_LINK_TRAINING_CTL);
        reg &= ~PRE_EMPHASIS_SET_MASK;
        reg |= level << PRE_EMPHASIS_SET_SHIFT;
        writel(reg, dp->reg_base + ANALOGIX_DP_LN0_LINK_TRAINING_CTL);
}

void analogix_dp_set_lane1_pre_emphasis(struct analogix_dp_device *dp,
                                        u32 level)
{
        u32 reg;

        reg = readl(dp->reg_base + ANALOGIX_DP_LN1_LINK_TRAINING_CTL);
        reg &= ~PRE_EMPHASIS_SET_MASK;
        reg |= level << PRE_EMPHASIS_SET_SHIFT;
        writel(reg, dp->reg_base + ANALOGIX_DP_LN1_LINK_TRAINING_CTL);
}

void analogix_dp_set_lane2_pre_emphasis(struct analogix_dp_device *dp,
                                        u32 level)
{
        u32 reg;

        reg = readl(dp->reg_base + ANALOGIX_DP_LN2_LINK_TRAINING_CTL);
        reg &= ~PRE_EMPHASIS_SET_MASK;
        reg |= level << PRE_EMPHASIS_SET_SHIFT;
        writel(reg, dp->reg_base + ANALOGIX_DP_LN2_LINK_TRAINING_CTL);
}

void analogix_dp_set_lane3_pre_emphasis(struct analogix_dp_device *dp,
                                        u32 level)
{
        u32 reg;

        reg = readl(dp->reg_base + ANALOGIX_DP_LN3_LINK_TRAINING_CTL);
        reg &= ~PRE_EMPHASIS_SET_MASK;
        reg |= level << PRE_EMPHASIS_SET_SHIFT;
        writel(reg, dp->reg_base + ANALOGIX_DP_LN3_LINK_TRAINING_CTL);
}

void analogix_dp_set_lane0_link_training(struct analogix_dp_device *dp,
                                         u32 training_lane)
{
        u32 reg;

        reg = training_lane;
        writel(reg, dp->reg_base + ANALOGIX_DP_LN0_LINK_TRAINING_CTL);
}

void analogix_dp_set_lane1_link_training(struct analogix_dp_device *dp,
                                         u32 training_lane)
{
        u32 reg;

        reg = training_lane;
        writel(reg, dp->reg_base + ANALOGIX_DP_LN1_LINK_TRAINING_CTL);
}

void analogix_dp_set_lane2_link_training(struct analogix_dp_device *dp,
                                         u32 training_lane)
{
        u32 reg;

        reg = training_lane;
        writel(reg, dp->reg_base + ANALOGIX_DP_LN2_LINK_TRAINING_CTL);
}

void analogix_dp_set_lane3_link_training(struct analogix_dp_device *dp,
                                         u32 training_lane)
{
        u32 reg;

        reg = training_lane;
        writel(reg, dp->reg_base + ANALOGIX_DP_LN3_LINK_TRAINING_CTL);
}

u32 analogix_dp_get_lane0_link_training(struct analogix_dp_device *dp)
{
        return readl(dp->reg_base + ANALOGIX_DP_LN0_LINK_TRAINING_CTL);
}

u32 analogix_dp_get_lane1_link_training(struct analogix_dp_device *dp)
{
        return readl(dp->reg_base + ANALOGIX_DP_LN1_LINK_TRAINING_CTL);
}

u32 analogix_dp_get_lane2_link_training(struct analogix_dp_device *dp)
{
        return readl(dp->reg_base + ANALOGIX_DP_LN2_LINK_TRAINING_CTL);
}

u32 analogix_dp_get_lane3_link_training(struct analogix_dp_device *dp)
{
        return readl(dp->reg_base + ANALOGIX_DP_LN3_LINK_TRAINING_CTL);
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_PHY_TEST);
        reg |= MACRO_RST;
        writel(reg, dp->reg_base + ANALOGIX_DP_PHY_TEST);

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

        reg &= ~MACRO_RST;
        writel(reg, dp->reg_base + ANALOGIX_DP_PHY_TEST);
}

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

        reg = VSYNC_DET | VID_FORMAT_CHG | VID_CLK_CHG;
        writel(reg, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_1);

        reg = 0x0;
        writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_1);

        reg = CHA_CRI(4) | CHA_CTRL;
        writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_2);

        reg = 0x0;
        writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3);

        reg = VID_HRES_TH(2) | VID_VRES_TH(0);
        writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_8);
}

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);
        writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_2);

        /* Set Input Color YCbCr Coefficients to ITU601 or ITU709 */
        reg = readl(dp->reg_base + 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;
        writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_3);
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_1);
        writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_1);

        reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_1);

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

        reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_2);
        writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_2);

        reg = readl(dp->reg_base + 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 = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_4);
                reg |= FIX_M_VID;
                writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_4);
                reg = m_value & 0xff;
                writel(reg, dp->reg_base + ANALOGIX_DP_M_VID_0);
                reg = (m_value >> 8) & 0xff;
                writel(reg, dp->reg_base + ANALOGIX_DP_M_VID_1);
                reg = (m_value >> 16) & 0xff;
                writel(reg, dp->reg_base + ANALOGIX_DP_M_VID_2);

                reg = n_value & 0xff;
                writel(reg, dp->reg_base + ANALOGIX_DP_N_VID_0);
                reg = (n_value >> 8) & 0xff;
                writel(reg, dp->reg_base + ANALOGIX_DP_N_VID_1);
                reg = (n_value >> 16) & 0xff;
                writel(reg, dp->reg_base + ANALOGIX_DP_N_VID_2);
        } else  {
                reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_4);
                reg &= ~FIX_M_VID;
                writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_4);

                writel(0x00, dp->reg_base + ANALOGIX_DP_N_VID_0);
                writel(0x80, dp->reg_base + ANALOGIX_DP_N_VID_1);
                writel(0x00, dp->reg_base + ANALOGIX_DP_N_VID_2);
        }
}

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

        if (type == VIDEO_TIMING_FROM_CAPTURE) {
                reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
                reg &= ~FORMAT_SEL;
                writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
        } else {
                reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
                reg |= FORMAT_SEL;
                writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
        }
}

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

        if (enable) {
                reg = readl(dp->reg_base + ANALOGIX_DP_SOC_GENERAL_CTL);
                reg &= ~VIDEO_MODE_MASK;
                reg |= VIDEO_MASTER_MODE_EN | VIDEO_MODE_MASTER_MODE;
                writel(reg, dp->reg_base + ANALOGIX_DP_SOC_GENERAL_CTL);
        } else {
                reg = readl(dp->reg_base + ANALOGIX_DP_SOC_GENERAL_CTL);
                reg &= ~VIDEO_MODE_MASK;
                reg |= VIDEO_MODE_SLAVE_MODE;
                writel(reg, dp->reg_base + ANALOGIX_DP_SOC_GENERAL_CTL);
        }
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
        reg |= VIDEO_EN;
        writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
        writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3);

        reg = readl(dp->reg_base + 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 = readl(dp->reg_base + 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;
        }
        writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_1);

        reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
        reg &= ~INTERACE_SCAN_CFG;
        reg |= (dp->video_info.interlaced << 2);
        writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);

        reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
        reg &= ~VSYNC_POLARITY_CFG;
        reg |= (dp->video_info.v_sync_polarity << 1);
        writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);

        reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
        reg &= ~HSYNC_POLARITY_CFG;
        reg |= (dp->video_info.h_sync_polarity << 0);
        writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);

        reg = AUDIO_MODE_SPDIF_MODE | VIDEO_MODE_SLAVE_MODE;
        writel(reg, dp->reg_base + ANALOGIX_DP_SOC_GENERAL_CTL);
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
        reg &= ~SCRAMBLING_DISABLE;
        writel(reg, dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
}

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

        reg = readl(dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
        reg |= SCRAMBLING_DISABLE;
        writel(reg, dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
}

void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp)
{
        writel(PSR_VID_CRC_ENABLE, dp->reg_base + ANALOGIX_DP_CRC_CON);
}

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 dp_sdp *vsc, bool blocking)
{
        unsigned int val;
        int ret;
        ssize_t psr_status;

        /* don't send info frame */
        val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
        val &= ~IF_EN;
        writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);

        /* configure single frame update mode */
        writel(PSR_FRAME_UP_TYPE_BURST | PSR_CRC_SEL_HARDWARE,
               dp->reg_base + ANALOGIX_DP_PSR_FRAME_UPDATE_CTRL);

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

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

        /* configure DB0 / DB1 values */
        writel(vsc->db[0], dp->reg_base + ANALOGIX_DP_VSC_SHADOW_DB0);
        writel(vsc->db[1], dp->reg_base + ANALOGIX_DP_VSC_SHADOW_DB1);

        /* set reuse spd inforframe */
        val = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_3);
        val |= REUSE_SPD_EN;
        writel(val, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_3);

        /* mark info frame update */
        val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
        val = (val | IF_UP) & ~IF_EN;
        writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);

        /* send info frame */
        val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
        val |= IF_EN;
        writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);

        if (!blocking)
                return 0;

        ret = readx_poll_timeout(analogix_dp_get_psr_status, dp, psr_status,
                psr_status >= 0 &&
                ((vsc->db[1] && psr_status == DP_PSR_SINK_ACTIVE_RFB) ||
                (!vsc->db[1] && 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;
}

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;

        /* Clear AUX CH data buffer */
        reg = BUF_CLR;
        writel(reg, dp->reg_base + ANALOGIX_DP_BUFFER_DATA_CTL);

        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);
        writel(reg, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_1);

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

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

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

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

        writel(reg, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2);

        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 */
        writel(RPLY_RECEIV, dp->reg_base + ANALOGIX_DP_INT_STA);

        /* Clear interrupt source for AUX CH access error */
        reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
        status_reg = readl(dp->reg_base + ANALOGIX_DP_AUX_CH_STA);
        if ((reg & AUX_ERR) || (status_reg & AUX_STATUS_MASK)) {
                writel(AUX_ERR, dp->reg_base + ANALOGIX_DP_INT_STA);

                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 = readl(dp->reg_base + ANALOGIX_DP_BUF_DATA_0 +
                                    4 * i);
                        buffer[i] = (unsigned char)reg;
                        num_transferred++;
                }
        }

        /* Check if Rx sends defer */
        reg = readl(dp->reg_base + 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 > 0 ? num_transferred : -EBUSY;

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

        return -EREMOTEIO;
}