[PATCH 5.18 231/879] arm64: dts: qcom: sc7280-idp: Configure CTS pin to bias-bus-hold for bluetooth

Greg Kroah-Hartman
2022-06-07T22:27:21Z

From: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>

[ Upstream commit 497b272759986af1aa5a25b5e903d082c67bd8f6 ]

WLAN rail was leaking power during RBSC/sleep even after turning BT off.
Change active and sleep pinctrl configurations to handle same.

Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1650556567-4995-2-git-send-email-quic_vnivarth@quicinc.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm64/boot/dts/qcom/sc7280-idp.dtsi | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
index ecbf2b89d896..5ab3696af354 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
@@ -400,10 +400,13 @@

&qup_uart7_cts {
/*
- * Configure a pull-down on CTS to match the pull of
- * the Bluetooth module.
+ * Configure a bias-bus-hold on CTS to lower power
+ * usage when Bluetooth is turned off. Bus hold will
+ * maintain a low power state regardless of whether
+ * the Bluetooth module drives the pin in either
+ * direction or leaves the pin fully unpowered.
*/
- bias-pull-down;
+ bias-bus-hold;
};

&qup_uart7_rts {
@@ -495,10 +498,13 @@
pins = "gpio28";
function = "gpio";
/*
- * Configure a pull-down on CTS to match the pull of
- * the Bluetooth module.
+ * Configure a bias-bus-hold on CTS to lower power
+ * usage when Bluetooth is turned off. Bus hold will
+ * maintain a low power state regardless of whether
+ * the Bluetooth module drives the pin in either
+ * direction or leaves the pin fully unpowered.
*/
- bias-pull-down;
+ bias-bus-hold;
};

qup_uart7_sleep_rts: qup-uart7-sleep-rts {
--
2.35.1