linux-kernel - [PATCH] regulator: hi6421v600: Fix setting idle mode

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Date:   Sat, 19 Jun 2021 20:34:23 +0800
From:   Axel Lin <axel.lin@...ics.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org, Axel Lin <axel.lin@...ics.com>
Subject: [PATCH] regulator: hi6421v600: Fix setting idle mode

commit db27f8294cd7 changed eco_mode << (ffs(sreg->eco_mode_mask) - 1)
to sreg->eco_mode_mask << (ffs(sreg->eco_mode_mask) - 1) which is wrong.
Fix it by simply set val = sreg->eco_mode_mask.

In additional, sreg->eco_mode_mask can be 0 (LDO3, LDO33, LDO34).
Return -EINVAL if idle mode is not supported when sreg->eco_mode_mask is 0.

While at it, also use unsigned int for reg_val/val which is the expected
type for regmap_read and regmap_update_bits.

Fixes: db27f8294cd7 ("staging: regulator: hi6421v600-regulator: use shorter names for OF properties")
Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/regulator/hi6421v600-regulator.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/hi6421v600-regulator.c b/drivers/regulator/hi6421v600-regulator.c
index b5a19938fd3a..9a68ef251de6 100644
--- a/drivers/regulator/hi6421v600-regulator.c
+++ b/drivers/regulator/hi6421v600-regulator.c
@@ -117,7 +117,7 @@ static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
 static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
 {
 	struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
-	u32 reg_val;
+	unsigned int reg_val;
 
 	regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
 
@@ -131,14 +131,17 @@ static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
 					  unsigned int mode)
 {
 	struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
-	u32 val;
+	unsigned int val;
 
 	switch (mode) {
 	case REGULATOR_MODE_NORMAL:
 		val = 0;
 		break;
 	case REGULATOR_MODE_IDLE:
-		val = sreg->eco_mode_mask << (ffs(sreg->eco_mode_mask) - 1);
+		if (!sreg->eco_mode_mask)
+			return -EINVAL;
+
+		val = sreg->eco_mode_mask;
 		break;
 	default:
 		return -EINVAL;
-- 
2.25.1