linux-kernel - [PATCH v4 06/10] scsi: ufs-mediatek: Support low-power mode for VCCQ

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Date:   Wed, 15 Jun 2022 11:51:42 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <martin.petersen@...cle.com>, <avri.altman@....com>,
        <alim.akhtar@...sung.com>, <jejb@...ux.ibm.com>,
        <bvanassche@....org>
CC:     <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <alice.chao@...iatek.com>, <powen.kao@...iatek.com>,
        <mason.zhang@...iatek.com>, <qilin.tan@...iatek.com>,
        <lin.gui@...iatek.com>, <eddie.huang@...iatek.com>,
        <tun-yu.yu@...iatek.com>, <cc.chou@...iatek.com>,
        <chaotian.jing@...iatek.com>, <jiajie.hao@...iatek.com>,
        <stanley.chu@...iatek.com>
Subject: [PATCH v4 06/10] scsi: ufs-mediatek: Support low-power mode for VCCQ

From: Peter Wang <peter.wang@...iatek.com>

Also allow VCCQ to enter low-power mode, and meanwhile
remove the restriction of VCC because VCCQ/VCCQ2 can
be changed to low-power mode even if VCC keeps on while
the device is not in active power mode.

Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>
Signed-off-by: Peter Wang <peter.wang@...iatek.com>
Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/ufs/host/ufs-mediatek.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 03762ecaaaf8..65a2a4185ef6 100755
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1031,7 +1031,13 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
 
 static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
 {
-	if (!hba->vreg_info.vccq2 || !hba->vreg_info.vcc)
+	struct ufs_vreg *vccqx = NULL;
+
+	if (!hba->vreg_info.vccq && !hba->vreg_info.vccq2)
+		return;
+
+	/* Skip if VCC is assumed always-on */
+	if (!hba->vreg_info.vcc)
 		return;
 
 	/* Bypass LPM when device is still active */
@@ -1042,12 +1048,13 @@ static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
 	if (lpm && hba->vreg_info.vcc->enabled)
 		return;
 
-	if (lpm)
-		regulator_set_mode(hba->vreg_info.vccq2->reg,
-				   REGULATOR_MODE_IDLE);
+	if (hba->vreg_info.vccq)
+		vccqx = hba->vreg_info.vccq;
 	else
-		regulator_set_mode(hba->vreg_info.vccq2->reg,
-				   REGULATOR_MODE_NORMAL);
+		vccqx = hba->vreg_info.vccq2;
+
+	regulator_set_mode(vccqx->reg,
+			   lpm ? REGULATOR_MODE_IDLE : REGULATOR_MODE_NORMAL);
 }
 
 static void ufs_mtk_auto_hibern8_disable(struct ufs_hba *hba)
-- 
2.18.0