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arm64: dts: qcom: sc8280xp-arcata: Fix top USB-C DP alt mode

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The top USB-C port (usb0) didn't switch to DP alt mode, as reusing the
same GPIO 101 as on the SC8280XP CRD or Lenovo ThinkPad X13s was not
working on the Surface Pro 9 5G.

Investigation [1] by Jens on the Windows Dev Kit (WDK2023), the other
sc8280xp-based "blackrock" model from Microsoft, found a reference
to GPIO 100 in the DSDT in addition to 101. Switching to GPIO 100
fixed the issue on blackrock, as it does on arcata to enable
external screen when using the left-side top USB-C port.

[1] https://lore.kernel.org/all/20250609-blackrock-usb0-mux-v1-1-7903c3b071e4@oldschoolsolutions.biz/

Cc: Jens Glathe <jens.glathe@oldschoolsolutions.biz>
Fixes: f6231a2eef ("arm64: dts: qcom: sc8280xp: Add Microsoft Surface Pro 9 5G")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Jérôme de Bretagne <jerome.debretagne@gmail.com>
Link: https://lore.kernel.org/r/20260604-surface-sp9-5g-for-next-v3-4-6aa6f6612c10@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Jérôme de Bretagne 2026-06-04 18:18:40 +02:00 committed by Bjorn Andersson
parent 784b0cdc23
commit 16065c4ec1
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts
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@ -270,7 +270,7 @@ map1 {
usb0-sbu-mux {
compatible = "pericom,pi3usb102", "gpio-sbu-mux";
enable-gpios = <&tlmm 101 GPIO_ACTIVE_LOW>;
enable-gpios = <&tlmm 100 GPIO_ACTIVE_LOW>;
select-gpios = <&tlmm 164 GPIO_ACTIVE_HIGH>;
pinctrl-0 = <&usb0_sbu_default>;
@ -1083,7 +1083,7 @@ tx-pins {
usb0_sbu_default: usb0-sbu-state {
oe-n-pins {
pins = "gpio101";
pins = "gpio100";
function = "gpio";
bias-disable;
drive-strength = <16>;