linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: x1p42100-lenovo-thinkbook-16: force usb2-only mode on usb_1_ss2

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Message-ID: <3zazejrynu6cl4ah36virtjl2jthlrjw4h3inkp4zjaovbtaif@2dnywhywqyzb>
Date: Sat, 20 Dec 2025 20:54:40 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: jens.glathe@...schoolsolutions.biz
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Val Packett <val@...kett.cool>
Subject: Re: [PATCH 1/2] arm64: dts: qcom: x1p42100-lenovo-thinkbook-16:
 force usb2-only mode on usb_1_ss2_dwc3

On Sat, Dec 20, 2025 at 06:47:09PM +0100, Jens Glathe via B4 Relay wrote:
> From: Jens Glathe <jens.glathe@...schoolsolutions.biz>
> 
> The usb_1_ss2 complex has 2 phys, usb_1_ss2_hsphy and usb_1_ss2_qmpphy. On this
> laptop, they are used for different peripherals: The hsphy for the fingerprint
> reader, the qmpphy to drive a hdmi bridge. The normal logical wiring for the dwc3
> controller is to both phys. Overwrite that with ports only to the hsphy.
> 
> Signed-off-by: Jens Glathe <jens.glathe@...schoolsolutions.biz>
> ---
>  arch/arm64/boot/dts/qcom/x1p42100-lenovo-thinkbook-16.dts | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1p42100-lenovo-thinkbook-16.dts b/arch/arm64/boot/dts/qcom/x1p42100-lenovo-thinkbook-16.dts
> index 3186e79e862de67cbda48a4b85a459e6e965ba65..b505a4cbb4350a962bbf779ec788265c7583bf20 100644
> --- a/arch/arm64/boot/dts/qcom/x1p42100-lenovo-thinkbook-16.dts
> +++ b/arch/arm64/boot/dts/qcom/x1p42100-lenovo-thinkbook-16.dts
> @@ -1560,6 +1560,20 @@ &usb_1_ss2_dwc3 {
>  	maximum-speed = "high-speed";
>  	phys = <&usb_1_ss2_hsphy>;
>  	phy-names = "usb2-phy";
> +
> +	/delete-property/ ports;

Just delete port@1 or only &usb_1_ss2_dwc3_ss endpoint.

> +
> +	ports {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		port@0 {
> +			reg = <0>;
> +
> +			usb_1_ss2_dwc3_hs: endpoint {
> +			};
> +		};
> +	};
>  };
>  
>  &usb_1_ss2_hsphy {
> 
> -- 
> 2.51.0
> 
> 

-- 
With best wishes
Dmitry