[PATCH v6] phy: qcom-qmp: add display port v4 voltage and pre-emphasis swing tables

[Kuogee Hsieh <quic_khsieh@quicinc.com>]

From: Kuogee Hsieh <khsieh@codeaurora.org>

"add support for sm8250-usb3-dp phy" patch added functions to support V4
phy. But it did not update voltage and pre-emphasis tables accordingly.
This patch add v4 voltage and pre-emphasis swing tables to complete v4
phy implementation. Both voltage and pre-emphasis swing level are set
during link training negotiation between host and sink. There are totally
four tables added.  A voltage swing table for both hbr and hbr1, a voltage
table for both hbr2 and hbr3, a pre-emphasis table for both hbr and hbr1
and a pre-emphasis table for both hbr2 and hbr3. In addition, write 0x0a
to TX_TX_POL_INV is added to complete the sequence of configure dp phy
base on HPG.

Chnages in v2:
-- revise commit test
-- add Fixes tag
-- replaced voltage_swing_cfg with voltage
-- replaced pre_emphasis_cfg with emphasis
-- delete drv_lvl_reg and emp_post_reg parameters from qcom_qmp_v4_phy_configure_dp_swing()
-- delete drv_lvl_reg and emp_post_reg parameters from qcom_qmp_phy_configure_dp_swing()

Changes in V3:
-- add __qcom_qmp_phy_configure_dp_swing() to commit swing/pre-emphasis level

Changes in V4:
-- pass 2D array to __qcom_qmp_phy_configure_dp_swing()

Changes in V5:
-- rebase on msm-next

Changes in V6:
-- change commit text title
-- re wording commit text

Fixes: aff188feb5e1 ("phy: qcom-qmp: add support for sm8250-usb3-dp phy")
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c | 97 +++++++++++++++++++++++++------------
 1 file changed, 66 insertions(+), 31 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 456a59d..1f3585d 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -4283,12 +4283,17 @@ static const u8 qmp_dp_v3_voltage_swing_hbr_rbr[4][4] = {
 	{ 0x1f, 0xff, 0xff, 0xff }
 };
 
-static int qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy,
-		unsigned int drv_lvl_reg, unsigned int emp_post_reg)
+static int __qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy,
+				unsigned int drv_lvl_reg,
+				unsigned int emp_post_reg,
+				const u8 voltage_swing_hbr_rbr[4][4],
+				const u8 pre_emphasis_hbr_rbr[4][4],
+				const u8 voltage_swing_hbr3_hbr2[4][4],
+				const u8 pre_emphasis_hbr3_hbr2[4][4])
 {
 	const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts;
 	unsigned int v_level = 0, p_level = 0;
-	u8 voltage_swing_cfg, pre_emphasis_cfg;
+	u8 voltage, emphasis;
 	int i;
 
 	for (i = 0; i < dp_opts->lanes; i++) {
@@ -4297,26 +4302,25 @@ static int qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy,
 	}
 
 	if (dp_opts->link_rate <= 2700) {
-		voltage_swing_cfg = qmp_dp_v3_voltage_swing_hbr_rbr[v_level][p_level];
-		pre_emphasis_cfg = qmp_dp_v3_pre_emphasis_hbr_rbr[v_level][p_level];
+		voltage = voltage_swing_hbr_rbr[v_level][p_level];
+		emphasis = pre_emphasis_hbr_rbr[v_level][p_level];
 	} else {
-		voltage_swing_cfg = qmp_dp_v3_voltage_swing_hbr3_hbr2[v_level][p_level];
-		pre_emphasis_cfg = qmp_dp_v3_pre_emphasis_hbr3_hbr2[v_level][p_level];
+		voltage = voltage_swing_hbr3_hbr2[v_level][p_level];
+		emphasis = pre_emphasis_hbr3_hbr2[v_level][p_level];
 	}
 
 	/* TODO: Move check to config check */
-	if (voltage_swing_cfg == 0xFF && pre_emphasis_cfg == 0xFF)
+	if (voltage == 0xFF && emphasis == 0xFF)
 		return -EINVAL;
 
 	/* Enable MUX to use Cursor values from these registers */
-	voltage_swing_cfg |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN;
-	pre_emphasis_cfg |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN;
-
-	writel(voltage_swing_cfg, qphy->tx + drv_lvl_reg);
-	writel(pre_emphasis_cfg, qphy->tx + emp_post_reg);
-	writel(voltage_swing_cfg, qphy->tx2 + drv_lvl_reg);
-	writel(pre_emphasis_cfg, qphy->tx2 + emp_post_reg);
+	voltage |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN;
+	emphasis |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN;
 
+	writel(voltage, qphy->tx + drv_lvl_reg);
+	writel(emphasis, qphy->tx + emp_post_reg);
+	writel(voltage, qphy->tx2 + drv_lvl_reg);
+	writel(emphasis, qphy->tx2 + emp_post_reg);
 	return 0;
 }
 
@@ -4325,9 +4329,13 @@ static void qcom_qmp_v3_phy_configure_dp_tx(struct qmp_phy *qphy)
 	const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts;
 	u32 bias_en, drvr_en;
 
-	if (qcom_qmp_phy_configure_dp_swing(qphy,
-				QSERDES_V3_TX_TX_DRV_LVL,
-				QSERDES_V3_TX_TX_EMP_POST1_LVL) < 0)
+	if (__qcom_qmp_phy_configure_dp_swing(qphy,
+			QSERDES_V3_TX_TX_DRV_LVL,
+			QSERDES_V3_TX_TX_EMP_POST1_LVL,
+			qmp_dp_v3_voltage_swing_hbr_rbr,
+			qmp_dp_v3_pre_emphasis_hbr_rbr,
+			qmp_dp_v3_voltage_swing_hbr3_hbr2,
+			qmp_dp_v3_pre_emphasis_hbr3_hbr2) < 0)
 		return;
 
 	if (dp_opts->lanes == 1) {
@@ -4465,6 +4473,35 @@ static int qcom_qmp_v3_dp_phy_calibrate(struct qmp_phy *qphy)
 	return 0;
 }
 
+/* The values in these tables are given without MUX_EN (0x20) bit set */
+static const u8 qmp_dp_v4_pre_emphasis_hbr3_hbr2[4][4] = {
+	{ 0x00, 0x0c, 0x15, 0x1b },
+	{ 0x02, 0x0e, 0x16, 0xff },
+	{ 0x02, 0x11, 0xff, 0xff },
+	{ 0x04, 0xff, 0xff, 0xff }
+};
+
+static const u8 qmp_dp_v4_voltage_swing_hbr3_hbr2[4][4] = {
+	{ 0x02, 0x12, 0x16, 0x1a },
+	{ 0x09, 0x19, 0x1f, 0xff },
+	{ 0x10, 0x1f, 0xff, 0xff },
+	{ 0x1f, 0xff, 0xff, 0xff }
+};
+
+static const u8 qmp_dp_v4_pre_emphasis_hbr_rbr[4][4] = {
+	{ 0x00, 0x0e, 0x15, 0x1b },
+	{ 0x00, 0x0e, 0x15, 0xff },
+	{ 0x00, 0x0e, 0xff, 0xff },
+	{ 0x04, 0xff, 0xff, 0xff }
+};
+
+static const u8 qmp_dp_v4_voltage_swing_hbr_rbr[4][4] = {
+	{ 0x08, 0x0f, 0x16, 0x1f },
+	{ 0x11, 0x1e, 0x1f, 0xff },
+	{ 0x16, 0x1f, 0xff, 0xff },
+	{ 0x1f, 0xff, 0xff, 0xff }
+};
+
 static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy)
 {
 	writel(DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_PSR_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
@@ -4494,16 +4531,13 @@ static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy)
 
 static void qcom_qmp_v4_phy_configure_dp_tx(struct qmp_phy *qphy)
 {
-	/* Program default values before writing proper values */
-	writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL);
-	writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL);
-
-	writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL);
-	writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL);
-
-	qcom_qmp_phy_configure_dp_swing(qphy,
+	__qcom_qmp_phy_configure_dp_swing(qphy,
 			QSERDES_V4_TX_TX_DRV_LVL,
-			QSERDES_V4_TX_TX_EMP_POST1_LVL);
+			QSERDES_V4_TX_TX_EMP_POST1_LVL,
+			qmp_dp_v4_voltage_swing_hbr_rbr,
+			qmp_dp_v4_pre_emphasis_hbr_rbr,
+			qmp_dp_v4_voltage_swing_hbr3_hbr2,
+			qmp_dp_v4_pre_emphasis_hbr3_hbr2);
 }
 
 static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy)
@@ -4622,6 +4656,9 @@ static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy)
 	writel(drvr1_en, qphy->tx2 + QSERDES_V4_TX_HIGHZ_DRVR_EN);
 	writel(bias1_en, qphy->tx2 + QSERDES_V4_TX_TRANSCEIVER_BIAS_EN);
 
+	writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV);
+	writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV);
+
 	writel(0x18, qphy->pcs + QSERDES_DP_PHY_CFG);
 	udelay(2000);
 	writel(0x19, qphy->pcs + QSERDES_DP_PHY_CFG);
@@ -4633,11 +4670,9 @@ static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy)
 			10000))
 		return -ETIMEDOUT;
 
-	writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV);
-	writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV);
 
-	writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL);
-	writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL);
+	writel(0x22, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL);
+	writel(0x22, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL);
 
 	writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL);
 	writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project