linux-kernel - [PATCH 1/2] phy/qualcomm: add hbr3_hbr2 voltage and premphasis swing table

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Date:   Wed, 17 Feb 2021 15:20:31 -0800
From:   Kuogee Hsieh <khsieh@...eaurora.org>
To:     robdclark@...il.com, sean@...rly.run, swboyd@...omium.org,
        vkoul@...nel.org, agross@...nel.org, bjorn.andersson@...aro.org
Cc:     tanmay@...eaurora.org, abhinavk@...eaurora.org,
        aravindh@...eaurora.org, khsieh@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] phy/qualcomm: add hbr3_hbr2 voltage and premphasis swing table

Add hbr3_hbr2 voltage and premphasis swing table to support
HBR3 link rate.

Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 0939a9e..c920143 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -2965,6 +2965,20 @@ static void qcom_qmp_phy_dp_aux_init(struct qmp_phy *qphy)
 	       qphy->pcs + QSERDES_V3_DP_PHY_AUX_INTERRUPT_MASK);
 }
 
+static const u8 qmp_dp_v3_pre_emphasis_hbr3_hbr2[4][4] = {
+        { 0x00, 0x0C, 0x15, 0x1A },
+        { 0x02, 0x0E, 0x16, 0xFF },
+        { 0x02, 0x11, 0xFF, 0xFF },
+        { 0x04, 0xFF, 0xFF, 0xFF }
+};
+
+static const u8 qmp_dp_v3_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_v3_pre_emphasis_hbr_rbr[4][4] = {
 	{ 0x00, 0x0c, 0x14, 0x19 },
 	{ 0x00, 0x0b, 0x12, 0xff },
@@ -3000,8 +3014,13 @@ static void qcom_qmp_phy_configure_dp_tx(struct qmp_phy *qphy)
 		drvr_en = 0x10;
 	}
 
-	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];
+	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];
+	} 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];
+	}
 
 	/* TODO: Move check to config check */
 	if (voltage_swing_cfg == 0xFF && pre_emphasis_cfg == 0xFF)
-- 
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a Linux Foundation Collaborative Project