linux-kernel - [PATCH 3.9-stable] regulator: mc13892: Fix MC13892_SWITCHERS0_SWxHI bit in set_voltage

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Date:	Wed, 22 May 2013 13:55:32 +0900
From:	Jonghwan Choi <jhbird.choi@...sung.com>
To:	'Jonghwan Choi' <jhbird.choi@...sung.com>,
	linux-kernel@...r.kernel.org
Cc:	stable@...r.kernel.org, 'Mark Brown' <broonie@...ena.org.uk>,
	'Axel Lin' <axel.lin@...ics.com>
Subject: [PATCH 3.9-stable]  regulator: mc13892: Fix MC13892_SWITCHERS0_SWxHI
 bit in set_voltage_sel

This patch looks like it should be in the 3.9-stable tree, should we apply
it?

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

From: "Axel Lin <axel.lin@...ics.com>"

commit 78040b630f28298e0ecb56bf1bc53c7976314eab upstream

It is necessary to clear MC13892_SWITCHERS0_SWxHI bit when set voltage to
the
voltage range from 1100000 to 1375000. Leaving MC13892_SWITCHERS0_SWxHI bit
untouched may result in wrong voltage setting.

For example, currently switch voltage from 1400000 to 1300000 will set the
voltage to 1800000 because the HI bit is still set.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
Signed-off-by: Mark Brown <broonie@...ena.org.uk>
Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
---
 drivers/regulator/mc13892-regulator.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/mc13892-regulator.c
b/drivers/regulator/mc13892-regulator.c
index 9891aec..cc76c52 100644
--- a/drivers/regulator/mc13892-regulator.c
+++ b/drivers/regulator/mc13892-regulator.c
@@ -465,13 +465,13 @@ static int mc13892_sw_regulator_set_voltage_sel(struct
regulator_dev *rdev,
 	 */
 
 	if (mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) {
+		mask |= MC13892_SWITCHERS0_SWxHI;
+
 		if (volt > 1375000) {
 			reg_value -= MC13892_SWxHI_SEL_OFFSET;
 			reg_value |= MC13892_SWITCHERS0_SWxHI;
-			mask |= MC13892_SWITCHERS0_SWxHI;
-		} else if (volt < 1100000) {
+		} else {
 			reg_value &= ~MC13892_SWITCHERS0_SWxHI;
-			mask |= MC13892_SWITCHERS0_SWxHI;
 		}
 	}
 
-- 
1.7.9.

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