From: Stephan Gerhold stephan@gerhold.net
[ Upstream commit e2ee9edc282961783d519c760bbaa20fed4dec38 ]
The original qcom kernel changed the PDM GPIOs to be pull-down during sleep at some point. Reportedly this was done because there was some "leakage at PDM outputs during sleep":
https://source.codeaurora.org/quic/la/kernel/msm-3.10/commit/?id=0f87e08c1cd...
I cannot say how effective this is, but everything seems to work fine with this change so let's apply the same to mainline just to be sure.
Cc: Srinivas Kandagatla srinivas.kandagatla@linaro.org Signed-off-by: Stephan Gerhold stephan@gerhold.net Link: https://lore.kernel.org/r/20200605185916.318494-3-stephan@gerhold.net Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/qcom/msm8916-pins.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi b/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi index 5785bf0a807ce..591f48a575353 100644 --- a/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi +++ b/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi @@ -569,7 +569,7 @@ pinconf { pins = "gpio63", "gpio64", "gpio65", "gpio66", "gpio67", "gpio68"; drive-strength = <2>; - bias-disable; + bias-pull-down; }; }; };