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    Subject[PATCH 4.14 132/293] arm64: tegra: Update Jetson TX1 GPU regulator timings
    Date
    From: Jon Hunter <jonathanh@nvidia.com>

    commit ece6031ece2dd64d63708cfe1088016cee5b10c0 upstream.

    The GPU regulator enable ramp delay for Jetson TX1 is set to 1ms which
    not sufficient because the enable ramp delay has been measured to be
    greater than 1ms. Furthermore, the downstream kernels released by NVIDIA
    for Jetson TX1 are using a enable ramp delay 2ms and a settling delay of
    160us. Update the GPU regulator enable ramp delay for Jetson TX1 to be
    2ms and add a settling delay of 160us.

    Cc: stable@vger.kernel.org
    Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
    Fixes: 5e6b9a89afce ("arm64: tegra: Add VDD_GPU regulator to Jetson TX1")
    Signed-off-by: Thierry Reding <treding@nvidia.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
    +++ b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
    @@ -307,7 +307,8 @@
    regulator-max-microvolt = <1320000>;
    enable-gpios = <&pmic 6 GPIO_ACTIVE_HIGH>;
    regulator-ramp-delay = <80>;
    - regulator-enable-ramp-delay = <1000>;
    + regulator-enable-ramp-delay = <2000>;
    + regulator-settling-time-us = <160>;
    };
    };
    };

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