arm64: tegra: Update Jetson TX1 GPU regulator timings

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>

diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
index 053458a5db55bef47ae3223af38eefc00828367a..ede86856ec3966f3a58bd3fbb76fda4fe847afa1 100644 (file)
--- a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
@@ -322,7 +322,8 @@
                        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>;
                };
        };
 };