linux-kernel - [PATCH V2 4/4] ufs: ufs-qcom: Add support for limiting HS gear and rate

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Message-ID: <20250821101609.20235-5-quic_rdwivedi@quicinc.com>
Date: Thu, 21 Aug 2025 15:46:09 +0530
From: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
To: <mani@...nel.org>, <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <bvanassche@....org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <agross@...nel.org>,
        <James.Bottomley@...senPartnership.com>, <martin.petersen@...cle.com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH V2 4/4] ufs: ufs-qcom: Add support for limiting HS gear and rate

Add support to limit Tx/Rx gear and rate during UFS initialization
based on DT property.

Also update the phy_gear to ensure PHY calibrations align with
the required gear and rate.

Signed-off-by: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 1a93351fb70e..53c64d5fb95d 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1092,6 +1092,18 @@ static void ufs_qcom_set_phy_gear(struct ufs_qcom_host *host)
 	}
 }
 
+static void ufs_qcom_parse_limits(struct ufs_hba *hba)
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+	struct ufs_host_params *host_params = &host->host_params;
+	u32 hs_gear_old = host_params->hs_tx_gear;
+
+	ufshcd_parse_limits(hba, host_params);
+	if (host_params->hs_tx_gear != hs_gear_old) {
+		host->phy_gear = host_params->hs_tx_gear;
+	}
+}
+
 static void ufs_qcom_set_host_params(struct ufs_hba *hba)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
@@ -1333,6 +1345,7 @@ static int ufs_qcom_init(struct ufs_hba *hba)
 	ufs_qcom_advertise_quirks(hba);
 	ufs_qcom_set_host_params(hba);
 	ufs_qcom_set_phy_gear(host);
+	ufs_qcom_parse_limits(hba);
 
 	err = ufs_qcom_ice_init(host);
 	if (err)
-- 
2.50.1