linux-kernel - [PATCH v2 2/2] scsi: ufs: qcom: Add sanity checks for gear/lane values during ICC scaling

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Message-Id: <20240403-ufs-icc-fix-v2-2-958412a5eb45@linaro.org>
Date: Wed, 03 Apr 2024 18:50:04 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 "James E.J. Bottomley" <jejb@...ux.ibm.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 2/2] scsi: ufs: qcom: Add sanity checks for gear/lane
 values during ICC scaling

Let's add the checks to warn the user if the ICC scaling is not supported
for the gear/lane values and also fallback to the max value if that's the
case.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/ufs/host/ufs-qcom.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 696540ca835e..79b4ce05f7c5 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -696,6 +696,16 @@ static struct __ufs_qcom_bw_table ufs_qcom_get_bw_table(struct ufs_qcom_host *ho
 	int gear = max_t(u32, p->gear_rx, p->gear_tx);
 	int lane = max_t(u32, p->lane_rx, p->lane_tx);

+	if (WARN_ONCE(gear > QCOM_UFS_MAX_GEAR,
+		      "ICC scaling for UFS Gear (%d) not supported. Using Gear (%d) bandwidth\n",
+		      gear, QCOM_UFS_MAX_GEAR))
+		gear = QCOM_UFS_MAX_GEAR;
+
+	if (WARN_ONCE(lane > QCOM_UFS_MAX_LANE,
+		      "ICC scaling for UFS Lane (%d) not supported. Using Lane (%d) bandwidth\n",
+		      lane, QCOM_UFS_MAX_LANE))
+		lane = QCOM_UFS_MAX_LANE;
+
 	if (ufshcd_is_hs_mode(p)) {
 		if (p->hs_rate == PA_HS_MODE_B)
 			return ufs_qcom_bw_table[MODE_HS_RB][gear][lane];

-- 
2.25.1