linux-kernel - [PATCH 3.17 035/146] regulator: ltc3589: fix broken voltage transitions

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Date:	Tue, 28 Oct 2014 11:32:57 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Lucas Stach <l.stach@...gutronix.de>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH 3.17 035/146] regulator: ltc3589: fix broken voltage transitions

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

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

From: Steffen Trumtrar <s.trumtrar@...gutronix.de>

commit c5bb725ac2d1a13e9e766bf9a16bac986ade17cd upstream.

VCCR is used as a trigger to start voltage transitions, so
we need to mark it volatile in order to make sure it gets
written to hardware every time we set a new voltage.

Fixes regulator voltage being stuck at the first voltage
set after driver load.

[lst: reworded commit message]
Signed-off-by: Steffen Trumtrar <s.trumtrar@...gutronix.de>
Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/regulator/ltc3589.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/regulator/ltc3589.c
+++ b/drivers/regulator/ltc3589.c
@@ -372,6 +372,7 @@ static bool ltc3589_volatile_reg(struct
 	switch (reg) {
 	case LTC3589_IRQSTAT:
 	case LTC3589_PGSTAT:
+	case LTC3589_VCCR:
 		return true;
 	}
 	return false;


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