linux-kernel - [PATCH 3.16.y-ckt 007/216] regulator: anatop: Set default voltage selector for vddpu

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Message-Id: <1421085933-32536-8-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 12 Jan 2015 18:02:04 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Markus Pargmann <mpa@...gutronix.de>,
	Mark Brown <broonie@...nel.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 007/216] regulator: anatop: Set default voltage selector for vddpu

3.16.7-ckt4 -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: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/regulator/anatop-regulator.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
index 4f730af70e7c..30e8d7ad5813 100644
--- a/drivers/regulator/anatop-regulator.c
+++ b/drivers/regulator/anatop-regulator.c
@@ -283,6 +283,14 @@ static int anatop_regulator_probe(struct platform_device *pdev)
 			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;
 	}
-- 
2.1.4

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