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[v4,05/10] scsi: ufs-mediatek: Prevent device regulators setting as LPM incorrectly

Message ID 20220615035146.20964-6-stanley.chu@mediatek.com
State New
Headers show
Series csi: ufs: Fix PMC and low-power mode on MediaTek UFS platforms | expand

Commit Message

Stanley Chu June 15, 2022, 3:51 a.m. UTC 
From: Po-Wen Kao <powen.kao@mediatek.com>

Device regulatrs are allowed to enter low-power mode
if neither device is not in active mode, nor VCC does not
keep on.

Simply fix this by adding conditions before LPM decision.

Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
 drivers/ufs/host/ufs-mediatek.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 817d957512a3..03762ecaaaf8 100755
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1034,10 +1034,18 @@  static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
 	if (!hba->vreg_info.vccq2 || !hba->vreg_info.vcc)
 		return;
 
-	if (lpm && !hba->vreg_info.vcc->enabled)
+	/* Bypass LPM when device is still active */
+	if (lpm && ufshcd_is_ufs_dev_active(hba))
+		return;
+
+	/* Bypass LPM if VCC is enabled */
+	if (lpm && hba->vreg_info.vcc->enabled)
+		return;
+
+	if (lpm)
 		regulator_set_mode(hba->vreg_info.vccq2->reg,
 				   REGULATOR_MODE_IDLE);
-	else if (!lpm)
+	else
 		regulator_set_mode(hba->vreg_info.vccq2->reg,
 				   REGULATOR_MODE_NORMAL);
 }