linux-kernel - [PATCH 3.15 042/139] regulator: s2mpa01: Fix accidental enable of buck4 ramp delay

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Message-Id: <20140628174607.346684018@linuxfoundation.org>
Date:	Sat, 28 Jun 2014 10:46:43 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Axel Lin <axel.lin@...ics.com>, Mark Brown <broonie@...aro.org>
Subject: [PATCH 3.15 042/139] regulator: s2mpa01: Fix accidental enable of buck4 ramp delay

3.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Krzysztof Kozlowski <k.kozlowski@...sung.com>

commit 51e2fc0a251ba64c68207e4c6f6ac33c891b2465 upstream.

S2MPA01 supports enabling/disabling ramp delay only for buck[1234].
Other bucks have ramp delay enabled always.

However the bit shift for enabling buck4 ramp delay in register is equal
to 0. When ramp delay was set for the bucks unsupporting enable/disable
(buck[56789] and buck10), the ramp delay for buck4 was also enabled.

Fixes: f7b1a8dc1c1c ("regulator: s2mpa01: Don't check enable_shift before setting enable ramp rate")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Reviewed-by: Axel Lin <axel.lin@...ics.com>
Signed-off-by: Mark Brown <broonie@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/regulator/s2mpa01.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/regulator/s2mpa01.c
+++ b/drivers/regulator/s2mpa01.c
@@ -191,11 +191,15 @@ static int s2mpa01_set_ramp_delay(struct
 	if (!ramp_enable)
 		goto ramp_disable;
 
-	ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
-				 1 << enable_shift, 1 << enable_shift);
-	if (ret) {
-		dev_err(&rdev->dev, "failed to enable ramp rate\n");
-		return ret;
+	/* Ramp delay can be enabled/disabled only for buck[1234] */
+	if (rdev_get_id(rdev) >= S2MPA01_BUCK1 &&
+			rdev_get_id(rdev) <= S2MPA01_BUCK4) {
+		ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
+					 1 << enable_shift, 1 << enable_shift);
+		if (ret) {
+			dev_err(&rdev->dev, "failed to enable ramp rate\n");
+			return ret;
+		}
 	}
 
 	ramp_val = get_ramp_delay(ramp_delay);


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