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[V2,3/3] scsi: ufs: qcom: Add support to disable UFS LPM Feature

Message ID 20250506163705.31518-4-quic_nitirawa@quicinc.com
State New
Headers show
Series Add support to disable UFS LPM | expand

Commit Message

Nitin Rawat May 6, 2025, 4:37 p.m. UTC 
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@quicinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--
2.48.1
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Patch

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index c0761ccc1381..ad4974c6d08e 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1057,12 +1057,15 @@  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;
+	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_AGGR_POWER_COLLAPSE;
+		hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
+	}
+
 	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);
 }