[PATCH V6 4/4] ufs: ufs-qcom: Add support for limiting HS gear and rate

Ram Kumar Dwivedi posted 4 patches 2 weeks ago
[PATCH V6 4/4] ufs: ufs-qcom: Add support for limiting HS gear and rate
Posted by Ram Kumar Dwivedi 2 weeks ago
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@quicinc.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..b5d7904597d9 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_gear_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_gear_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_gear_limits(hba);
 
 	err = ufs_qcom_ice_init(host);
 	if (err)
-- 
2.50.1
RE: [PATCH V6 4/4] ufs: ufs-qcom: Add support for limiting HS gear and rate
Posted by Alim Akhtar 2 weeks ago

> -----Original Message-----
> From: Ram Kumar Dwivedi <quic_rdwivedi@quicinc.com>
> Sent: Wednesday, September 17, 2025 7:40 PM
> To: alim.akhtar@samsung.com; avri.altman@wdc.com; bvanassche@acm.org;
> robh@kernel.org; krzk+dt@kernel.org; conor+dt@kernel.org; mani@kernel.org;
> James.Bottomley@HansenPartnership.com; martin.petersen@oracle.com
> Cc: linux-scsi@vger.kernel.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; linux-arm-msm@vger.kernel.org
> Subject: [PATCH V6 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@quicinc.com>
> ---

Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>