linux-kernel - [PATCH v4 1/3] scsi: ufs: qcom: Check gear against max gear in vop freq_to

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Message-Id: <20250522021537.999107-2-quic_ziqichen@quicinc.com>
Date: Thu, 22 May 2025 10:15:35 +0800
From: Ziqi Chen <quic_ziqichen@...cinc.com>
To: quic_cang@...cinc.com, bvanassche@....org, mani@...nel.org,
        beanhuo@...ron.com, avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com, quic_ziqichen@...cinc.com,
        quic_nguyenb@...cinc.com, quic_nitirawa@...cinc.com,
        quic_rampraka@...cinc.com, neil.armstrong@...aro.org,
        luca.weiss@...rphone.com, konrad.dybcio@....qualcomm.com,
        peter.wang@...iatek.com
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        Loïc Minier <loic.minier@....qualcomm.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v4 1/3] scsi: ufs: qcom: Check gear against max gear in vop freq_to_gear()

The vop freq_to_gear() may return a gear greater than the negotiated max
gear, return the negotiated max gear if the mapped gear is greater than it.

Fixes: c02fe9e222d1 ("scsi: ufs: qcom: Implement the freq_to_gear_speed() vop")
Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
Reported-by: Neil Armstrong <neil.armstrong@...aro.org>
Closes: https://lore.kernel.org/all/c7f2476a-943a-4d73-ad80-802c91e5f880@linaro.org/
Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
Reviewed-by: Bean Huo <beanhuo@...ron.com>
Tested-by: Loïc Minier <loic.minier@....qualcomm.com>

---
v1 -> v2:
1. Instead of return 'gear', return '0' directly if didn't find mapped
   gear
2. Derectly return min_t(gear,max_gear) instead assign to 'gear' then
   return it.

v2 -> v3:
Replace hard code '0' with enum 'UFS_HS_DONT_CHANGE'.

v3 -> v4:
Rebased to 6.15/scsi-queue which the relevant patch applied to.
---
 drivers/ufs/host/ufs-qcom.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index d03a07402223..a97fe8eee27a 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1880,7 +1880,7 @@ static int ufs_qcom_config_esi(struct ufs_hba *hba)
 
 static u32 ufs_qcom_freq_to_gear_speed(struct ufs_hba *hba, unsigned long freq)
 {
-	u32 gear = 0;
+	u32 gear = UFS_HS_DONT_CHANGE;
 
 	switch (freq) {
 	case 403000000:
@@ -1902,10 +1902,10 @@ static u32 ufs_qcom_freq_to_gear_speed(struct ufs_hba *hba, unsigned long freq)
 		break;
 	default:
 		dev_err(hba->dev, "%s: Unsupported clock freq : %lu\n", __func__, freq);
-		break;
+		return UFS_HS_DONT_CHANGE;
 	}
 
-	return gear;
+	return min_t(u32, gear, hba->max_pwr_info.info.gear_rx);
 }
 
 /*
-- 
2.34.1