drivers/phy/qualcomm/phy-qcom-edp.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2017, 2020, The Linux Foundation. All rights reserved.
 * Copyright (c) 2021, Linaro Ltd.
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/slab.h>

#include <dt-bindings/phy/phy.h>

#include "phy-qcom-qmp-dp-phy.h"
#include "phy-qcom-qmp-qserdes-com-v4.h"

/* EDP_PHY registers */
#define DP_PHY_CFG                              0x0010
#define DP_PHY_CFG_1                            0x0014
#define DP_PHY_PD_CTL                           0x001c
#define DP_PHY_MODE                             0x0020

#define DP_PHY_AUX_CFG0				0x0024
#define DP_PHY_AUX_CFG1				0x0028
#define DP_PHY_AUX_CFG2				0x002C
#define DP_PHY_AUX_CFG3				0x0030
#define DP_PHY_AUX_CFG4				0x0034
#define DP_PHY_AUX_CFG5				0x0038
#define DP_PHY_AUX_CFG6				0x003C
#define DP_PHY_AUX_CFG7				0x0040
#define DP_PHY_AUX_CFG8				0x0044
#define DP_PHY_AUX_CFG9				0x0048

#define DP_PHY_AUX_INTERRUPT_MASK		0x0058

#define DP_PHY_VCO_DIV                          0x0074
#define DP_PHY_TX0_TX1_LANE_CTL                 0x007c
#define DP_PHY_TX2_TX3_LANE_CTL                 0x00a0

#define DP_PHY_STATUS                           0x00e0

/* LANE_TXn registers */
#define TXn_CLKBUF_ENABLE                       0x0000
#define TXn_TX_EMP_POST1_LVL                    0x0004

#define TXn_TX_DRV_LVL                          0x0014
#define TXn_TX_DRV_LVL_OFFSET                   0x0018
#define TXn_RESET_TSYNC_EN                      0x001c
#define TXn_LDO_CONFIG                          0x0084
#define TXn_TX_BAND                             0x0028

#define TXn_RES_CODE_LANE_OFFSET_TX0            0x0044
#define TXn_RES_CODE_LANE_OFFSET_TX1            0x0048

#define TXn_TRANSCEIVER_BIAS_EN                 0x0054
#define TXn_HIGHZ_DRVR_EN                       0x0058
#define TXn_TX_POL_INV                          0x005c
#define TXn_LANE_MODE_1                         0x0064

#define TXn_TRAN_DRVR_EMP_EN                    0x0078

struct qcom_edp_cfg {
	bool is_dp;

	/* DP PHY swing and pre_emphasis tables */
	const u8 (*swing_hbr_rbr)[4][4];
	const u8 (*swing_hbr3_hbr2)[4][4];
	const u8 (*pre_emphasis_hbr_rbr)[4][4];
	const u8 (*pre_emphasis_hbr3_hbr2)[4][4];
};

struct qcom_edp {
	struct device *dev;
	const struct qcom_edp_cfg *cfg;

	struct phy *phy;

	void __iomem *edp;
	void __iomem *tx0;
	void __iomem *tx1;
	void __iomem *pll;

	struct clk_hw dp_link_hw;
	struct clk_hw dp_pixel_hw;

	struct phy_configure_opts_dp dp_opts;

	struct clk_bulk_data clks[2];
	struct regulator_bulk_data supplies[2];
};

static const u8 dp_swing_hbr_rbr[4][4] = {
	{ 0x08, 0x0f, 0x16, 0x1f },
	{ 0x11, 0x1e, 0x1f, 0xff },
	{ 0x16, 0x1f, 0xff, 0xff },
	{ 0x1f, 0xff, 0xff, 0xff }
};

static const u8 dp_pre_emp_hbr_rbr[4][4] = {
	{ 0x00, 0x0d, 0x14, 0x1a },
	{ 0x00, 0x0e, 0x15, 0xff },
	{ 0x00, 0x0e, 0xff, 0xff },
	{ 0x03, 0xff, 0xff, 0xff }
};

static const u8 dp_swing_hbr2_hbr3[4][4] = {
	{ 0x02, 0x12, 0x16, 0x1a },
	{ 0x09, 0x19, 0x1f, 0xff },
	{ 0x10, 0x1f, 0xff, 0xff },
	{ 0x1f, 0xff, 0xff, 0xff }
};

static const u8 dp_pre_emp_hbr2_hbr3[4][4] = {
	{ 0x00, 0x0c, 0x15, 0x1b },
	{ 0x02, 0x0e, 0x16, 0xff },
	{ 0x02, 0x11, 0xff, 0xff },
	{ 0x04, 0xff, 0xff, 0xff }
};

static const struct qcom_edp_cfg dp_phy_cfg = {
	.is_dp = true,
	.swing_hbr_rbr = &dp_swing_hbr_rbr,
	.swing_hbr3_hbr2 = &dp_swing_hbr2_hbr3,
	.pre_emphasis_hbr_rbr = &dp_pre_emp_hbr_rbr,
	.pre_emphasis_hbr3_hbr2 = &dp_pre_emp_hbr2_hbr3,
};

static const u8 edp_swing_hbr_rbr[4][4] = {
	{ 0x07, 0x0f, 0x16, 0x1f },
	{ 0x0d, 0x16, 0x1e, 0xff },
	{ 0x11, 0x1b, 0xff, 0xff },
	{ 0x16, 0xff, 0xff, 0xff }
};

static const u8 edp_pre_emp_hbr_rbr[4][4] = {
	{ 0x05, 0x12, 0x17, 0x1d },
	{ 0x05, 0x11, 0x18, 0xff },
	{ 0x06, 0x11, 0xff, 0xff },
	{ 0x00, 0xff, 0xff, 0xff }
};

static const u8 edp_swing_hbr2_hbr3[4][4] = {
	{ 0x0b, 0x11, 0x17, 0x1c },
	{ 0x10, 0x19, 0x1f, 0xff },
	{ 0x19, 0x1f, 0xff, 0xff },
	{ 0x1f, 0xff, 0xff, 0xff }
};

static const u8 edp_pre_emp_hbr2_hbr3[4][4] = {
	{ 0x08, 0x11, 0x17, 0x1b },
	{ 0x00, 0x0c, 0x13, 0xff },
	{ 0x05, 0x10, 0xff, 0xff },
	{ 0x00, 0xff, 0xff, 0xff }
};

static const struct qcom_edp_cfg edp_phy_cfg = {
	.is_dp = false,
	.swing_hbr_rbr = &edp_swing_hbr_rbr,
	.swing_hbr3_hbr2 = &edp_swing_hbr2_hbr3,
	.pre_emphasis_hbr_rbr = &edp_pre_emp_hbr_rbr,
	.pre_emphasis_hbr3_hbr2 = &edp_pre_emp_hbr2_hbr3,
};

static int qcom_edp_phy_init(struct phy *phy)
{
	struct qcom_edp *edp = phy_get_drvdata(phy);
	const struct qcom_edp_cfg *cfg = edp->cfg;
	int ret;
	u8 cfg8;

	ret = regulator_bulk_enable(ARRAY_SIZE(edp->supplies), edp->supplies);
	if (ret)
		return ret;

	ret = clk_bulk_prepare_enable(ARRAY_SIZE(edp->clks), edp->clks);
	if (ret)
		goto out_disable_supplies;

	writel(DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
	       DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN,
	       edp->edp + DP_PHY_PD_CTL);

	/* Turn on BIAS current for PHY/PLL */
	writel(0x17, edp->pll + QSERDES_V4_COM_BIAS_EN_CLKBUFLR_EN);

	writel(DP_PHY_PD_CTL_PSR_PWRDN, edp->edp + DP_PHY_PD_CTL);
	msleep(20);

	writel(DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
	       DP_PHY_PD_CTL_LANE_0_1_PWRDN | DP_PHY_PD_CTL_LANE_2_3_PWRDN |
	       DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN,
	       edp->edp + DP_PHY_PD_CTL);

	if (cfg && cfg->is_dp)
		cfg8 = 0xb7;
	else
		cfg8 = 0x37;

	writel(0xfc, edp->edp + DP_PHY_MODE);

	writel(0x00, edp->edp + DP_PHY_AUX_CFG0);
	writel(0x13, edp->edp + DP_PHY_AUX_CFG1);
	writel(0x24, edp->edp + DP_PHY_AUX_CFG2);
	writel(0x00, edp->edp + DP_PHY_AUX_CFG3);
	writel(0x0a, edp->edp + DP_PHY_AUX_CFG4);
	writel(0x26, edp->edp + DP_PHY_AUX_CFG5);
	writel(0x0a, edp->edp + DP_PHY_AUX_CFG6);
	writel(0x03, edp->edp + DP_PHY_AUX_CFG7);
	writel(cfg8, edp->edp + DP_PHY_AUX_CFG8);
	writel(0x03, edp->edp + DP_PHY_AUX_CFG9);

	writel(PHY_AUX_STOP_ERR_MASK | PHY_AUX_DEC_ERR_MASK |
	       PHY_AUX_SYNC_ERR_MASK | PHY_AUX_ALIGN_ERR_MASK |
	       PHY_AUX_REQ_ERR_MASK, edp->edp + DP_PHY_AUX_INTERRUPT_MASK);

	msleep(20);

	return 0;

out_disable_supplies:
	regulator_bulk_disable(ARRAY_SIZE(edp->supplies), edp->supplies);

	return ret;
}

static int qcom_edp_set_voltages(struct qcom_edp *edp, const struct phy_configure_opts_dp *dp_opts)
{
	const struct qcom_edp_cfg *cfg = edp->cfg;
	unsigned int v_level = 0;
	unsigned int p_level = 0;
	u8 ldo_config;
	u8 swing;
	u8 emph;
	int i;

	if (!cfg)
		return 0;

	for (i = 0; i < dp_opts->lanes; i++) {
		v_level = max(v_level, dp_opts->voltage[i]);
		p_level = max(p_level, dp_opts->pre[i]);
	}

	if (dp_opts->link_rate <= 2700) {
		swing = (*cfg->swing_hbr_rbr)[v_level][p_level];
		emph = (*cfg->pre_emphasis_hbr_rbr)[v_level][p_level];
	} else {
		swing = (*cfg->swing_hbr3_hbr2)[v_level][p_level];
		emph = (*cfg->pre_emphasis_hbr3_hbr2)[v_level][p_level];
	}

	if (swing == 0xff || emph == 0xff)
		return -EINVAL;

	ldo_config = (cfg && cfg->is_dp) ? 0x1 : 0x0;

	writel(ldo_config, edp->tx0 + TXn_LDO_CONFIG);
	writel(swing, edp->tx0 + TXn_TX_DRV_LVL);
	writel(emph, edp->tx0 + TXn_TX_EMP_POST1_LVL);

	writel(ldo_config, edp->tx1 + TXn_LDO_CONFIG);
	writel(swing, edp->tx1 + TXn_TX_DRV_LVL);
	writel(emph, edp->tx1 + TXn_TX_EMP_POST1_LVL);

	return 0;
}

static int qcom_edp_phy_configure(struct phy *phy, union phy_configure_opts *opts)
{
	const struct phy_configure_opts_dp *dp_opts = &opts->dp;
	struct qcom_edp *edp = phy_get_drvdata(phy);
	int ret = 0;

	memcpy(&edp->dp_opts, dp_opts, sizeof(*dp_opts));

	if (dp_opts->set_voltages)
		ret = qcom_edp_set_voltages(edp, dp_opts);

	return ret;
}

static int qcom_edp_configure_ssc(const struct qcom_edp *edp)
{
	const struct phy_configure_opts_dp *dp_opts = &edp->dp_opts;
	u32 step1;
	u32 step2;

	switch (dp_opts->link_rate) {
	case 1620:
	case 2700:
	case 8100:
		step1 = 0x45;
		step2 = 0x06;
		break;

	case 5400:
		step1 = 0x5c;
		step2 = 0x08;
		break;

	default:
		/* Other link rates aren't supported */
		return -EINVAL;
	}

	writel(0x01, edp->pll + QSERDES_V4_COM_SSC_EN_CENTER);
	writel(0x00, edp->pll + QSERDES_V4_COM_SSC_ADJ_PER1);
	writel(0x36, edp->pll + QSERDES_V4_COM_SSC_PER1);
	writel(0x01, edp->pll + QSERDES_V4_COM_SSC_PER2);
	writel(step1, edp->pll + QSERDES_V4_COM_SSC_STEP_SIZE1_MODE0);
	writel(step2, edp->pll + QSERDES_V4_COM_SSC_STEP_SIZE2_MODE0);

	return 0;
}

static int qcom_edp_configure_pll(const struct qcom_edp *edp)
{
	const struct phy_configure_opts_dp *dp_opts = &edp->dp_opts;
	u32 div_frac_start2_mode0;
	u32 div_frac_start3_mode0;
	u32 dec_start_mode0;
	u32 lock_cmp1_mode0;
	u32 lock_cmp2_mode0;
	u32 hsclk_sel;

	switch (dp_opts->link_rate) {
	case 1620:
		hsclk_sel = 0x5;
		dec_start_mode0 = 0x69;
		div_frac_start2_mode0 = 0x80;
		div_frac_start3_mode0 = 0x07;
		lock_cmp1_mode0 = 0x6f;
		lock_cmp2_mode0 = 0x08;
		break;

	case 2700:
		hsclk_sel = 0x3;
		dec_start_mode0 = 0x69;
		div_frac_start2_mode0 = 0x80;
		div_frac_start3_mode0 = 0x07;
		lock_cmp1_mode0 = 0x0f;
		lock_cmp2_mode0 = 0x0e;
		break;

	case 5400:
		hsclk_sel = 0x1;
		dec_start_mode0 = 0x8c;
		div_frac_start2_mode0 = 0x00;
		div_frac_start3_mode0 = 0x0a;
		lock_cmp1_mode0 = 0x1f;
		lock_cmp2_mode0 = 0x1c;
		break;

	case 8100:
		hsclk_sel = 0x0;
		dec_start_mode0 = 0x69;
		div_frac_start2_mode0 = 0x80;
		div_frac_start3_mode0 = 0x07;
		lock_cmp1_mode0 = 0x2f;
		lock_cmp2_mode0 = 0x2a;
		break;

	default:
		/* Other link rates aren't supported */
		return -EINVAL;
	}

	writel(0x01, edp->pll + QSERDES_V4_COM_SVS_MODE_CLK_SEL);
	writel(0x0b, edp->pll + QSERDES_V4_COM_SYSCLK_EN_SEL);
	writel(0x02, edp->pll + QSERDES_V4_COM_SYS_CLK_CTRL);
	writel(0x0c, edp->pll + QSERDES_V4_COM_CLK_ENABLE1);
	writel(0x06, edp->pll + QSERDES_V4_COM_SYSCLK_BUF_ENABLE);
	writel(0x30, edp->pll + QSERDES_V4_COM_CLK_SELECT);
	writel(hsclk_sel, edp->pll + QSERDES_V4_COM_HSCLK_SEL);
	writel(0x0f, edp->pll + QSERDES_V4_COM_PLL_IVCO);
	writel(0x08, edp->pll + QSERDES_V4_COM_LOCK_CMP_EN);
	writel(0x36, edp->pll + QSERDES_V4_COM_PLL_CCTRL_MODE0);
	writel(0x16, edp->pll + QSERDES_V4_COM_PLL_RCTRL_MODE0);
	writel(0x06, edp->pll + QSERDES_V4_COM_CP_CTRL_MODE0);
	writel(dec_start_mode0, edp->pll + QSERDES_V4_COM_DEC_START_MODE0);
	writel(0x00, edp->pll + QSERDES_V4_COM_DIV_FRAC_START1_MODE0);
	writel(div_frac_start2_mode0, edp->pll + QSERDES_V4_COM_DIV_FRAC_START2_MODE0);
	writel(div_frac_start3_mode0, edp->pll + QSERDES_V4_COM_DIV_FRAC_START3_MODE0);
	writel(0x02, edp->pll + QSERDES_V4_COM_CMN_CONFIG);
	writel(0x3f, edp->pll + QSERDES_V4_COM_INTEGLOOP_GAIN0_MODE0);
	writel(0x00, edp->pll + QSERDES_V4_COM_INTEGLOOP_GAIN1_MODE0);
	writel(0x00, edp->pll + QSERDES_V4_COM_VCO_TUNE_MAP);
	writel(lock_cmp1_mode0, edp->pll + QSERDES_V4_COM_LOCK_CMP1_MODE0);
	writel(lock_cmp2_mode0, edp->pll + QSERDES_V4_COM_LOCK_CMP2_MODE0);

	writel(0x0a, edp->pll + QSERDES_V4_COM_BG_TIMER);
	writel(0x14, edp->pll + QSERDES_V4_COM_CORECLK_DIV_MODE0);
	writel(0x00, edp->pll + QSERDES_V4_COM_VCO_TUNE_CTRL);
	writel(0x17, edp->pll + QSERDES_V4_COM_BIAS_EN_CLKBUFLR_EN);
	writel(0x0f, edp->pll + QSERDES_V4_COM_CORE_CLK_EN);
	writel(0xa0, edp->pll + QSERDES_V4_COM_VCO_TUNE1_MODE0);
	writel(0x03, edp->pll + QSERDES_V4_COM_VCO_TUNE2_MODE0);

	return 0;
}

static int qcom_edp_set_vco_div(const struct qcom_edp *edp, unsigned long *pixel_freq)
{
	const struct phy_configure_opts_dp *dp_opts = &edp->dp_opts;
	u32 vco_div;

	switch (dp_opts->link_rate) {
	case 1620:
		vco_div = 0x1;
		*pixel_freq = 1620000000UL / 2;
		break;

	case 2700:
		vco_div = 0x1;
		*pixel_freq = 2700000000UL / 2;
		break;

	case 5400:
		vco_div = 0x2;
		*pixel_freq = 5400000000UL / 4;
		break;

	case 8100:
		vco_div = 0x0;
		*pixel_freq = 8100000000UL / 6;
		break;

	default:
		/* Other link rates aren't supported */
		return -EINVAL;
	}

	writel(vco_div, edp->edp + DP_PHY_VCO_DIV);

	return 0;
}

static int qcom_edp_phy_power_on(struct phy *phy)
{
	const struct qcom_edp *edp = phy_get_drvdata(phy);
	const struct qcom_edp_cfg *cfg = edp->cfg;
	u32 bias0_en, drvr0_en, bias1_en, drvr1_en;
	unsigned long pixel_freq;
	u8 ldo_config;
	int timeout;
	int ret;
	u32 val;
	u8 cfg1;

	writel(DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
	       DP_PHY_PD_CTL_LANE_0_1_PWRDN | DP_PHY_PD_CTL_LANE_2_3_PWRDN |
	       DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN,
	       edp->edp + DP_PHY_PD_CTL);
	writel(0xfc, edp->edp + DP_PHY_MODE);

	timeout = readl_poll_timeout(edp->pll + QSERDES_V4_COM_CMN_STATUS,
				     val, val & BIT(7), 5, 200);
	if (timeout)
		return timeout;


	ldo_config = (cfg && cfg->is_dp) ? 0x1 : 0x0;

	writel(ldo_config, edp->tx0 + TXn_LDO_CONFIG);
	writel(ldo_config, edp->tx1 + TXn_LDO_CONFIG);
	writel(0x00, edp->tx0 + TXn_LANE_MODE_1);
	writel(0x00, edp->tx1 + TXn_LANE_MODE_1);

	if (edp->dp_opts.ssc) {
		ret = qcom_edp_configure_ssc(edp);
		if (ret)
			return ret;
	}

	ret = qcom_edp_configure_pll(edp);
	if (ret)
		return ret;

	/* TX Lane configuration */
	writel(0x05, edp->edp + DP_PHY_TX0_TX1_LANE_CTL);
	writel(0x05, edp->edp + DP_PHY_TX2_TX3_LANE_CTL);

	/* TX-0 register configuration */
	writel(0x03, edp->tx0 + TXn_TRANSCEIVER_BIAS_EN);
	writel(0x0f, edp->tx0 + TXn_CLKBUF_ENABLE);
	writel(0x03, edp->tx0 + TXn_RESET_TSYNC_EN);
	writel(0x01, edp->tx0 + TXn_TRAN_DRVR_EMP_EN);
	writel(0x04, edp->tx0 + TXn_TX_BAND);

	/* TX-1 register configuration */
	writel(0x03, edp->tx1 + TXn_TRANSCEIVER_BIAS_EN);
	writel(0x0f, edp->tx1 + TXn_CLKBUF_ENABLE);
	writel(0x03, edp->tx1 + TXn_RESET_TSYNC_EN);
	writel(0x01, edp->tx1 + TXn_TRAN_DRVR_EMP_EN);
	writel(0x04, edp->tx1 + TXn_TX_BAND);

	ret = qcom_edp_set_vco_div(edp, &pixel_freq);
	if (ret)
		return ret;

	writel(0x01, edp->edp + DP_PHY_CFG);
	writel(0x05, edp->edp + DP_PHY_CFG);
	writel(0x01, edp->edp + DP_PHY_CFG);
	writel(0x09, edp->edp + DP_PHY_CFG);

	writel(0x20, edp->pll + QSERDES_V4_COM_RESETSM_CNTRL);

	timeout = readl_poll_timeout(edp->pll + QSERDES_V4_COM_C_READY_STATUS,
				     val, val & BIT(0), 500, 10000);
	if (timeout)
		return timeout;

	writel(0x19, edp->edp + DP_PHY_CFG);
	writel(0x1f, edp->tx0 + TXn_HIGHZ_DRVR_EN);
	writel(0x04, edp->tx0 + TXn_HIGHZ_DRVR_EN);
	writel(0x00, edp->tx0 + TXn_TX_POL_INV);
	writel(0x1f, edp->tx1 + TXn_HIGHZ_DRVR_EN);
	writel(0x04, edp->tx1 + TXn_HIGHZ_DRVR_EN);
	writel(0x00, edp->tx1 + TXn_TX_POL_INV);
	writel(0x10, edp->tx0 + TXn_TX_DRV_LVL_OFFSET);
	writel(0x10, edp->tx1 + TXn_TX_DRV_LVL_OFFSET);
	writel(0x11, edp->tx0 + TXn_RES_CODE_LANE_OFFSET_TX0);
	writel(0x11, edp->tx0 + TXn_RES_CODE_LANE_OFFSET_TX1);
	writel(0x11, edp->tx1 + TXn_RES_CODE_LANE_OFFSET_TX0);
	writel(0x11, edp->tx1 + TXn_RES_CODE_LANE_OFFSET_TX1);

	writel(0x10, edp->tx0 + TXn_TX_EMP_POST1_LVL);
	writel(0x10, edp->tx1 + TXn_TX_EMP_POST1_LVL);
	writel(0x1f, edp->tx0 + TXn_TX_DRV_LVL);
	writel(0x1f, edp->tx1 + TXn_TX_DRV_LVL);

	if (edp->dp_opts.lanes == 1) {
		bias0_en = 0x01;
		bias1_en = 0x00;
		drvr0_en = 0x06;
		drvr1_en = 0x07;
		cfg1 = 0x1;
	} else if (edp->dp_opts.lanes == 2) {
		bias0_en = 0x03;
		bias1_en = 0x00;
		drvr0_en = 0x04;
		drvr1_en = 0x07;
		cfg1 = 0x3;
	} else {
		bias0_en = 0x03;
		bias1_en = 0x03;
		drvr0_en = 0x04;
		drvr1_en = 0x04;
		cfg1 = 0xf;
	}

	writel(drvr0_en, edp->tx0 + TXn_HIGHZ_DRVR_EN);
	writel(bias0_en, edp->tx0 + TXn_TRANSCEIVER_BIAS_EN);
	writel(drvr1_en, edp->tx1 + TXn_HIGHZ_DRVR_EN);
	writel(bias1_en, edp->tx1 + TXn_TRANSCEIVER_BIAS_EN);
	writel(cfg1, edp->edp + DP_PHY_CFG_1);

	writel(0x18, edp->edp + DP_PHY_CFG);
	usleep_range(100, 1000);

	writel(0x19, edp->edp + DP_PHY_CFG);

	ret = readl_poll_timeout(edp->edp + DP_PHY_STATUS,
				 val, val & BIT(1), 500, 10000);
	if (ret)
		return ret;

	clk_set_rate(edp->dp_link_hw.clk, edp->dp_opts.link_rate * 100000);
	clk_set_rate(edp->dp_pixel_hw.clk, pixel_freq);

	return 0;
}

static int qcom_edp_phy_power_off(struct phy *phy)
{
	const struct qcom_edp *edp = phy_get_drvdata(phy);

	writel(DP_PHY_PD_CTL_PSR_PWRDN, edp->edp + DP_PHY_PD_CTL);

	return 0;
}

static int qcom_edp_phy_exit(struct phy *phy)
{
	struct qcom_edp *edp = phy_get_drvdata(phy);

	clk_bulk_disable_unprepare(ARRAY_SIZE(edp->clks), edp->clks);
	regulator_bulk_disable(ARRAY_SIZE(edp->supplies), edp->supplies);

	return 0;
}

static const struct phy_ops qcom_edp_ops = {
	.init		= qcom_edp_phy_init,
	.configure	= qcom_edp_phy_configure,
	.power_on	= qcom_edp_phy_power_on,
	.power_off	= qcom_edp_phy_power_off,
	.exit		= qcom_edp_phy_exit,
	.owner		= THIS_MODULE,
};

/*
 * Embedded Display Port PLL driver block diagram for branch clocks
 *
 *              +------------------------------+
 *              |        EDP_VCO_CLK           |
 *              |                              |
 *              |    +-------------------+     |
 *              |    |  (EDP PLL/VCO)    |     |
 *              |    +---------+---------+     |
 *              |              v               |
 *              |   +----------+-----------+   |
 *              |   | hsclk_divsel_clk_src |   |
 *              |   +----------+-----------+   |
 *              +------------------------------+
 *                              |
 *          +---------<---------v------------>----------+
 *          |                                           |
 * +--------v----------------+                          |
 * |   edp_phy_pll_link_clk  |                          |
 * |     link_clk            |                          |
 * +--------+----------------+                          |
 *          |                                           |
 *          |                                           |
 *          v                                           v
 * Input to DISPCC block                                |
 * for link clk, crypto clk                             |
 * and interface clock                                  |
 *                                                      |
 *                                                      |
 *      +--------<------------+-----------------+---<---+
 *      |                     |                 |
 * +----v---------+  +--------v-----+  +--------v------+
 * | vco_divided  |  | vco_divided  |  | vco_divided   |
 * |    _clk_src  |  |    _clk_src  |  |    _clk_src   |
 * |              |  |              |  |               |
 * |divsel_six    |  |  divsel_two  |  |  divsel_four  |
 * +-------+------+  +-----+--------+  +--------+------+
 *         |                 |                  |
 *         v---->----------v-------------<------v
 *                         |
 *              +----------+-----------------+
 *              |   edp_phy_pll_vco_div_clk  |
 *              +---------+------------------+
 *                        |
 *                        v
 *              Input to DISPCC block
 *              for EDP pixel clock
 *
 */
static int qcom_edp_dp_pixel_clk_determine_rate(struct clk_hw *hw,
						struct clk_rate_request *req)
{
	switch (req->rate) {
	case 1620000000UL / 2:
	case 2700000000UL / 2:
	/* 5.4 and 8.1 GHz are same link rate as 2.7GHz, i.e. div 4 and div 6 */
		return 0;

	default:
		return -EINVAL;
	}
}

static unsigned long
qcom_edp_dp_pixel_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
	const struct qcom_edp *edp = container_of(hw, struct qcom_edp, dp_pixel_hw);
	const struct phy_configure_opts_dp *dp_opts = &edp->dp_opts;

	switch (dp_opts->link_rate) {
	case 1620:
		return 1620000000UL / 2;
	case 2700:
		return 2700000000UL / 2;
	case 5400:
		return 5400000000UL / 4;
	case 8100:
		return 8100000000UL / 6;
	default:
		return 0;
	}
}

static const struct clk_ops qcom_edp_dp_pixel_clk_ops = {
	.determine_rate = qcom_edp_dp_pixel_clk_determine_rate,
	.recalc_rate = qcom_edp_dp_pixel_clk_recalc_rate,
};

static int qcom_edp_dp_link_clk_determine_rate(struct clk_hw *hw,
					       struct clk_rate_request *req)
{
	switch (req->rate) {
	case 162000000:
	case 270000000:
	case 540000000:
	case 810000000:
		return 0;

	default:
		return -EINVAL;
	}
}

static unsigned long
qcom_edp_dp_link_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
	const struct qcom_edp *edp = container_of(hw, struct qcom_edp, dp_link_hw);
	const struct phy_configure_opts_dp *dp_opts = &edp->dp_opts;

	switch (dp_opts->link_rate) {
	case 1620:
	case 2700:
	case 5400:
	case 8100:
		return dp_opts->link_rate * 100000;

	default:
		return 0;
	}
}

static const struct clk_ops qcom_edp_dp_link_clk_ops = {
	.determine_rate = qcom_edp_dp_link_clk_determine_rate,
	.recalc_rate = qcom_edp_dp_link_clk_recalc_rate,
};

static int qcom_edp_clks_register(struct qcom_edp *edp, struct device_node *np)
{
	struct clk_hw_onecell_data *data;
	struct clk_init_data init = { };
	char name[64];
	int ret;

	data = devm_kzalloc(edp->dev, struct_size(data, hws, 2), GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	data->num = 2;

	snprintf(name, sizeof(name), "%s::link_clk", dev_name(edp->dev));
	init.ops = &qcom_edp_dp_link_clk_ops;
	init.name = name;
	edp->dp_link_hw.init = &init;
	ret = devm_clk_hw_register(edp->dev, &edp->dp_link_hw);
	if (ret)
		return ret;

	snprintf(name, sizeof(name), "%s::vco_div_clk", dev_name(edp->dev));
	init.ops = &qcom_edp_dp_pixel_clk_ops;
	init.name = name;
	edp->dp_pixel_hw.init = &init;
	ret = devm_clk_hw_register(edp->dev, &edp->dp_pixel_hw);
	if (ret)
		return ret;

	data->hws[0] = &edp->dp_link_hw;
	data->hws[1] = &edp->dp_pixel_hw;

	return devm_of_clk_add_hw_provider(edp->dev, of_clk_hw_onecell_get, data);
}

static int qcom_edp_phy_probe(struct platform_device *pdev)
{
	struct phy_provider *phy_provider;
	struct device *dev = &pdev->dev;
	struct qcom_edp *edp;
	int ret;

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

	edp->dev = dev;
	edp->cfg = of_device_get_match_data(&pdev->dev);

	edp->edp = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(edp->edp))
		return PTR_ERR(edp->edp);

	edp->tx0 = devm_platform_ioremap_resource(pdev, 1);
	if (IS_ERR(edp->tx0))
		return PTR_ERR(edp->tx0);

	edp->tx1 = devm_platform_ioremap_resource(pdev, 2);
	if (IS_ERR(edp->tx1))
		return PTR_ERR(edp->tx1);

	edp->pll = devm_platform_ioremap_resource(pdev, 3);
	if (IS_ERR(edp->pll))
		return PTR_ERR(edp->pll);

	edp->clks[0].id = "aux";
	edp->clks[1].id = "cfg_ahb";
	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(edp->clks), edp->clks);
	if (ret)
		return ret;

	edp->supplies[0].supply = "vdda-phy";
	edp->supplies[1].supply = "vdda-pll";
	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(edp->supplies), edp->supplies);
	if (ret)
		return ret;

	ret = regulator_set_load(edp->supplies[0].consumer, 21800); /* 1.2 V vdda-phy */
	if (ret) {
		dev_err(dev, "failed to set load at %s\n", edp->supplies[0].supply);
		return ret;
	}

	ret = regulator_set_load(edp->supplies[1].consumer, 36000); /* 0.9 V vdda-pll */
	if (ret) {
		dev_err(dev, "failed to set load at %s\n", edp->supplies[1].supply);
		return ret;
	}

	ret = qcom_edp_clks_register(edp, pdev->dev.of_node);
	if (ret)
		return ret;

	edp->phy = devm_phy_create(dev, pdev->dev.of_node, &qcom_edp_ops);
	if (IS_ERR(edp->phy)) {
		dev_err(dev, "failed to register phy\n");
		return PTR_ERR(edp->phy);
	}

	phy_set_drvdata(edp->phy, edp);

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	return PTR_ERR_OR_ZERO(phy_provider);
}

static const struct of_device_id qcom_edp_phy_match_table[] = {
	{ .compatible = "qcom,sc7280-edp-phy" },
	{ .compatible = "qcom,sc8180x-edp-phy" },
	{ .compatible = "qcom,sc8280xp-dp-phy", .data = &dp_phy_cfg },
	{ .compatible = "qcom,sc8280xp-edp-phy", .data = &edp_phy_cfg },
	{ }
};
MODULE_DEVICE_TABLE(of, qcom_edp_phy_match_table);

static struct platform_driver qcom_edp_phy_driver = {
	.probe		= qcom_edp_phy_probe,
	.driver = {
		.name	= "qcom-edp-phy",
		.of_match_table = qcom_edp_phy_match_table,
	},
};

module_platform_driver(qcom_edp_phy_driver);

MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@linaro.org>");
MODULE_DESCRIPTION("Qualcomm eDP QMP PHY driver");
MODULE_LICENSE("GPL v2");