linux-kernel - [PATCH v1 1/2] scsi: ufs: Allow regulators being always-on

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Date:   Mon, 7 Dec 2020 13:49:54 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <jejb@...ux.ibm.com>
CC:     <beanhuo@...ron.com>, <asutoshd@...eaurora.org>,
        <cang@...eaurora.org>, <matthias.bgg@...il.com>,
        <bvanassche@....org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kuohong.wang@...iatek.com>,
        <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <andy.teng@...iatek.com>, <chaotian.jing@...iatek.com>,
        <cc.chou@...iatek.com>, <jiajie.hao@...iatek.com>,
        <alice.chao@...iatek.com>, Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH v1 1/2] scsi: ufs: Allow regulators being always-on

Introduce a flag "always_on" in struct ufs_vreg to allow vendors
to keep the regulator always-on.

Reviewed-by: Andy Teng <andy.teng@...iatek.com>
Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/scsi/ufs/ufs.h    | 1 +
 drivers/scsi/ufs/ufshcd.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index d593edb48767..26f929afbcef 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -513,6 +513,7 @@ struct ufs_query_res {
 struct ufs_vreg {
 	struct regulator *reg;
 	const char *name;
+	bool always_on;
 	bool enabled;
 	int min_uV;
 	int max_uV;
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 6e72c0543c7b..4879e87577e1 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7973,7 +7973,7 @@ static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
 {
 	int ret = 0;
 
-	if (!vreg || !vreg->enabled)
+	if (!vreg || !vreg->enabled || vreg->always_on)
 		goto out;
 
 	ret = regulator_disable(vreg->reg);
-- 
2.18.0