linux-kernel - [PATCH v8 05/10] scsi: ufs: ufs-qcom: Limit HS-G5 Rate-A to hosts with HW version 5

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Message-Id: <1701520577-31163-6-git-send-email-quic_cang@quicinc.com>
Date:   Sat,  2 Dec 2023 04:36:11 -0800
From:   Can Guo <quic_cang@...cinc.com>
To:     quic_cang@...cinc.com, bvanassche@....org, mani@...nel.org,
        adrian.hunter@...el.com, vkoul@...nel.org, beanhuo@...ron.com,
        avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v8 05/10] scsi: ufs: ufs-qcom: Limit HS-G5 Rate-A to hosts with HW version 5

Qcom UFS hosts, with HW ver 5, can only support up to HS-G5 Rate-A due to
HW limitations. If the HS-G5 PHY gear is used, update host_params->hs_rate
to Rate-A, so that the subsequent power mode changes shall stick to Rate-A.

Reviewed-by: Nitin Rawat <quic_nitirawa@...cinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Can Guo <quic_cang@...cinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 81056b9..aca6199 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -442,9 +442,25 @@ static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba)
 static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	struct ufs_host_params *host_params = &host->host_params;
 	struct phy *phy = host->generic_phy;
+	enum phy_mode mode;
 	int ret;
 
+	/*
+	 * HW ver 5 can only support up to HS-G5 Rate-A due to HW limitations.
+	 * If the HS-G5 PHY gear is used, update host_params->hs_rate to Rate-A,
+	 * so that the subsequent power mode change shall stick to Rate-A.
+	 */
+	if (host->hw_ver.major == 0x5) {
+		if (host->phy_gear == UFS_HS_G5)
+			host_params->hs_rate = PA_HS_MODE_A;
+		else
+			host_params->hs_rate = PA_HS_MODE_B;
+	}
+
+	mode = host_params->hs_rate == PA_HS_MODE_B ? PHY_MODE_UFS_HS_B : PHY_MODE_UFS_HS_A;
+
 	/* Reset UFS Host Controller and PHY */
 	ret = ufs_qcom_host_reset(hba);
 	if (ret)
@@ -459,7 +475,7 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
 		return ret;
 	}
 
-	phy_set_mode_ext(phy, PHY_MODE_UFS_HS_B, host->phy_gear);
+	phy_set_mode_ext(phy, mode, host->phy_gear);
 
 	/* power on phy - start serdes and phy's power and clocks */
 	ret = phy_power_on(phy);
-- 
2.7.4