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    Subject[PATCH 3.13 015/151] ARM: dts: Keep G3D regulator always on for exynos5250-arndale
    Date
    3.13.11.1 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Tomasz Figa <t.figa@samsung.com>

    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@samsung.com>
    Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
    Tested-by: Tushar Behera <tushar.behera@linaro.org>
    Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
    Signed-off-by: Kamal Mostafa <kamal@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;
    regulator-boot-on;
    op_mode = <1>;
    };
    --
    1.9.1


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