linux-kernel - [PATCH 4.14 09/91] arm64: dts: qcom: msm8916: Pull down PDM GPIOs during sleep

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Message-Id: <20200901150928.571239256@linuxfoundation.org>
Date:   Tue,  1 Sep 2020 17:09:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 09/91] arm64: dts: qcom: msm8916: Pull down PDM GPIOs during sleep

From: Stephan Gerhold <stephan@...hold.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=0f87e08c1cd3e6484a6f7fb3e74e37340bdcdee0

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@...aro.org>
Signed-off-by: Stephan Gerhold <stephan@...hold.net>
Link: https://lore.kernel.org/r/20200605185916.318494-3-stephan@gerhold.net
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 69ba1d79bcd5d..b24493ad44b0f 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi
@@ -555,7 +555,7 @@
 				pins = "gpio63", "gpio64", "gpio65", "gpio66",
 				       "gpio67", "gpio68";
 				drive-strength = <2>;
-				bias-disable;
+				bias-pull-down;
 			};
 		};
 	};
-- 
2.25.1