linux-kernel - [PATCH] phy: qcom-qmp-pcie: Fix the SM8450 PCS registers

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Message-Id: <20220910063857.17372-1-manivannan.sadhasivam@linaro.org>
Date:   Sat, 10 Sep 2022 12:08:57 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     vkoul@...nel.org, andersson@...nel.org
Cc:     kishon@...com, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH] phy: qcom-qmp-pcie: Fix the SM8450 PCS registers

In the PCS region, registers QPHY_V5_PCS_EQ_CONFIG4 and
QPHY_V5_PCS_EQ_CONFIG5 should be used instead of QPHY_V5_PCS_EQ_CONFIG2
and QPHY_V5_PCS_EQ_CONFIG3.

This causes high latency when ASPM is enabled, so fix it!

Fixes: 2c91bf6bf290 ("phy: qcom-qmp: Add SM8450 PCIe1 PHY support")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-pcie.c   | 4 ++--
 drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index 4648467d5cac..b508903d77d0 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
@@ -1332,8 +1332,8 @@ static const struct qmp_phy_init_tbl sm8450_qmp_gen4x2_pcie_rx_tbl[] = {
 };
 
 static const struct qmp_phy_init_tbl sm8450_qmp_gen4x2_pcie_pcs_tbl[] = {
-	QMP_PHY_INIT_CFG(QPHY_V5_PCS_EQ_CONFIG2, 0x16),
-	QMP_PHY_INIT_CFG(QPHY_V5_PCS_EQ_CONFIG3, 0x22),
+	QMP_PHY_INIT_CFG(QPHY_V5_PCS_EQ_CONFIG4, 0x16),
+	QMP_PHY_INIT_CFG(QPHY_V5_PCS_EQ_CONFIG5, 0x22),
 	QMP_PHY_INIT_CFG(QPHY_V5_PCS_G3S2_PRE_GAIN, 0x2e),
 	QMP_PHY_INIT_CFG(QPHY_V5_PCS_RX_SIGDET_LVL, 0x99),
 };
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h b/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
index 61a44519f969..cca6455ec98c 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
@@ -11,7 +11,7 @@
 #define QPHY_V5_PCS_G3S2_PRE_GAIN			0x170
 #define QPHY_V5_PCS_RX_SIGDET_LVL			0x188
 #define QPHY_V5_PCS_RATE_SLEW_CNTRL1			0x198
-#define QPHY_V5_PCS_EQ_CONFIG2				0x1e0
-#define QPHY_V5_PCS_EQ_CONFIG3				0x1e4
+#define QPHY_V5_PCS_EQ_CONFIG4				0x2e0
+#define QPHY_V5_PCS_EQ_CONFIG5				0x2e4
 
 #endif
-- 
2.25.1