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.

Link: https://lore.kernel.org/r/20201207054955.24366-2-stanley.chu@mediatek.com
Reviewed-by: Andy Teng <andy.teng@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 142c2eb..14dfda7 100644 (file)
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -512,6 +512,7 @@ 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 a84a875..4f3ac25 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8012,7 +8012,7 @@ 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);