linux-kernel - [PATCH 3.18 16/84] regulator: anatop: Set default voltage selector for vddpu

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Date:	Tue,  6 Jan 2015 17:49:19 -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, Markus Pargmann <mpa@...gutronix.de>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH 3.18 16/84] regulator: anatop: Set default voltage selector for vddpu

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

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

From: Markus Pargmann <mpa@...gutronix.de>

commit fe08be3ec8672ed92b3ed1b85810df9fa0f98931 upstream.

The code reads the default voltage selector from its register. If the
bootloader disables the regulator, the default voltage selector will be
0 which results in faulty behaviour of this regulator driver.

This patch sets a default voltage selector for vddpu if it is not set in
the register.

Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/regulator/anatop-regulator.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/regulator/anatop-regulator.c
+++ b/drivers/regulator/anatop-regulator.c
@@ -283,6 +283,14 @@ static int anatop_regulator_probe(struct
 			sreg->sel = 0;
 			sreg->bypass = true;
 		}
+
+		/*
+		 * In case vddpu was disabled by the bootloader, we need to set
+		 * a sane default until imx6-cpufreq was probed and changes the
+		 * voltage to the correct value. In this case we set 1.25V.
+		 */
+		if (!sreg->sel && !strcmp(sreg->name, "vddpu"))
+			sreg->sel = 22;
 	} else {
 		rdesc->ops = &anatop_rops;
 	}


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