Re: [PATCH 05/11] arm64: dts: qcom: sc8280xp-arcata: Fix top USB-C DP alt mode

[Jérôme de Bretagne]

On 5/21/26 10:53, Konrad Dybcio wrote:
> On 5/20/26 6:40 PM, Jérôme de Bretagne via B4 Relay wrote:
>> From: Jérôme de Bretagne <jerome.debretagne@xxxxxxxxx>
>>
>> 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@xxxxxxxxxxxxxxxxxxxxxx/
>>
>> Cc: Jens Glathe <jens.glathe@xxxxxxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Jérôme de Bretagne <jerome.debretagne@xxxxxxxxx>
>> Fixes: f6231a2eefd4 ("arm64: dts: qcom: sc8280xp: Add Microsoft Surface Pro 9 5G")
> 
> Fixes should go before your sign-off

Sure, I will change this in v2.

> otherwise
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> 
> Konrad

Thank you,
Jérôme