[3.13.y.z extended stable] Patch "ARM: dts: Keep G3D regulator always on for exynos5250-arndale" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Thu May 1 19:17:04 UTC 2014

This is a note to let you know that I have just added a patch titled

    ARM: dts: Keep G3D regulator always on for exynos5250-arndale

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:


This patch is scheduled to be released in version

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see



>From e2557aff0a7a110897a28d921e354f673994fe30 Mon Sep 17 00:00:00 2001
From: Tomasz Figa <t.figa at samsung.com>
Date: Fri, 14 Feb 2014 07:43:54 +0900
Subject: ARM: dts: Keep G3D regulator always on for exynos5250-arndale

commit bfeda827278f09f4db35877e5f1ca9c149ca2890 upstream.

Apparently, if G3D regulator is powered off, the SoC cannot enter low
power modes and just hangs. This patch fixes this by keeping the
regulator always on when the system is running, as suggested by Exynos 4
User's Manual in case of Exynos4210/4x12 SoCs (Exynos5250 UM does not
have such note, but observed behavior seems to confirm that it is true
for this SoC as well).

This fixes an issue preventing Arndale board from entering sleep mode
observed since commit

346f372f7b72a0 clk: exynos5250: Add CLK_IGNORE_UNUSED flag for pmu clock

that landed in kernel 3.10, which has fixed the clock driver to make the
SoC actually try to enter the sleep mode.

Signed-off-by: Tomasz Figa <t.figa at samsung.com>
Acked-by: Kyungmin Park <kyungmin.park at samsung.com>
Tested-by: Tushar Behera <tushar.behera at linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 arch/arm/boot/dts/exynos5250-arndale.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/exynos5250-arndale.dts b/arch/arm/boot/dts/exynos5250-arndale.dts
index 6845270..9f66754 100644
--- a/arch/arm/boot/dts/exynos5250-arndale.dts
+++ b/arch/arm/boot/dts/exynos5250-arndale.dts
@@ -286,6 +286,7 @@
 					regulator-name = "vdd_g3d";
 					regulator-min-microvolt = <1000000>;
 					regulator-max-microvolt = <1000000>;
+					regulator-always-on;
 					op_mode = <1>;

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