linux-kernel - [PATCH V1 3/3] scsi: ufs: qcom: Add support to disable UFS LPM Feature

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Message-ID: <20250417124645.24456-4-quic_nitirawa@quicinc.com>
Date: Thu, 17 Apr 2025 18:16:45 +0530
From: Nitin Rawat <quic_nitirawa@...cinc.com>
To: alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
        krzk+dt@...nel.org, robh@...nel.org, mani@...nel.org,
        conor+dt@...nel.org, James.Bottomley@...senPartnership.com,
        martin.petersen@...cle.com, beanhuo@...ron.com,
        peter.wang@...iatek.com
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Nitin Rawat <quic_nitirawa@...cinc.com>
Subject: [PATCH V1 3/3] scsi: ufs: qcom: Add support to disable UFS LPM Feature

There are emulation FPGA platforms or other platforms where UFS low
power mode is either unsupported or power efficiency is not a critical
requirement.

Disable all low power mode UFS feature based on the "disable-lpm" device
tree property parsed in platform driver.

Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 1b37449fbffc..1024edf36b68 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1014,13 +1014,14 @@ static void ufs_qcom_set_host_caps(struct ufs_hba *hba)

 static void ufs_qcom_set_caps(struct ufs_hba *hba)
 {
-	hba->caps |= UFSHCD_CAP_CLK_GATING | UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
-	hba->caps |= UFSHCD_CAP_CLK_SCALING | UFSHCD_CAP_WB_WITH_CLK_SCALING;
-	hba->caps |= UFSHCD_CAP_AUTO_BKOPS_SUSPEND;
-	hba->caps |= UFSHCD_CAP_WB_EN;
-	hba->caps |= UFSHCD_CAP_AGGR_POWER_COLLAPSE;
-	hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
-
+	if (!hba->disable_lpm) {
+		hba->caps |= UFSHCD_CAP_CLK_GATING | UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
+		hba->caps |= UFSHCD_CAP_CLK_SCALING | UFSHCD_CAP_WB_WITH_CLK_SCALING;
+		hba->caps |= UFSHCD_CAP_AUTO_BKOPS_SUSPEND;
+		hba->caps |= UFSHCD_CAP_WB_EN;
+		hba->caps |= UFSHCD_CAP_AGGR_POWER_COLLAPSE;
+		hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
+	}
 	ufs_qcom_set_host_caps(hba);
 }

--
2.48.1