linux-kernel - [PATCH 3/5] phy: qcom: edp: Perform lane configuration

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Message-Id: <20220810040745.3582985-4-bjorn.andersson@linaro.org>
Date:   Tue,  9 Aug 2022 21:07:43 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] phy: qcom: edp: Perform lane configuration

The TRANSCIEVER_BIAS_EN, HIGHZ_DRVR_EN and PHY_CFG_1 registers are used
for lane configuration, with the currently hard coded configuration
being a mix of 2 and 4 lane (effectively 2-lane).

Properly implement lane configuration for 1, 2 and 4 lanes.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 drivers/phy/qualcomm/phy-qcom-edp.c | 32 ++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-edp.c b/drivers/phy/qualcomm/phy-qcom-edp.c
index 41aa28291cea..32614fb838b5 100644
--- a/drivers/phy/qualcomm/phy-qcom-edp.c
+++ b/drivers/phy/qualcomm/phy-qcom-edp.c
@@ -315,9 +315,11 @@ static int qcom_edp_set_vco_div(const struct qcom_edp *edp)
 static int qcom_edp_phy_power_on(struct phy *phy)
 {
 	const struct qcom_edp *edp = phy_get_drvdata(phy);
+	u32 bias0_en, drvr0_en, bias1_en, drvr1_en;
 	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 |
@@ -398,11 +400,31 @@ static int qcom_edp_phy_power_on(struct phy *phy)
 	writel(0x1f, edp->tx0 + TXn_TX_DRV_LVL);
 	writel(0x1f, edp->tx1 + TXn_TX_DRV_LVL);
 
-	writel(0x4, edp->tx0 + TXn_HIGHZ_DRVR_EN);
-	writel(0x3, edp->tx0 + TXn_TRANSCEIVER_BIAS_EN);
-	writel(0x4, edp->tx1 + TXn_HIGHZ_DRVR_EN);
-	writel(0x0, edp->tx1 + TXn_TRANSCEIVER_BIAS_EN);
-	writel(0x3, edp->edp + DP_PHY_CFG_1);
+	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);
-- 
2.35.1