linux-kernel - Re: [PATCH] Revert "arm64: dts: qcom: x1e78100-t14s: enable otg on usb-c ports"

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Message-ID: <Z1TCzEj05Anzwcc6@linaro.org>
Date: Sat, 7 Dec 2024 23:49:00 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: Johan Hovold <johan+linaro@...nel.org>
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>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Jonathan Marek <jonathan@...ek.ca>,
	Stephan Gerhold <stephan.gerhold@...aro.org>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [PATCH] Revert "arm64: dts: qcom: x1e78100-t14s: enable otg on
 usb-c ports"

On 24-12-06 18:24:02, Johan Hovold wrote:
> This reverts commit 1a48dd7b9ac809d1bd0fd2fef509abba83433846.
> 
> A recent change enabling OTG mode on the Lenovo ThinkPad T14s USB-C
> ports can break SuperSpeed device hotplugging. The host controller is
> enumerated, but the device is not:
> 
> 	xhci-hcd xhci-hcd.5.auto: xHCI Host Controller
> 	xhci-hcd xhci-hcd.5.auto: new USB bus registered, assigned bus number 3
> 	xhci-hcd xhci-hcd.5.auto: hcc params 0x0110ffc5 hci version 0x110 quirks 0x000080a000000810
> 	xhci-hcd xhci-hcd.5.auto: irq 247, io mem 0x0a800000
> 	xhci-hcd xhci-hcd.5.auto: xHCI Host Controller
> 	xhci-hcd xhci-hcd.5.auto: new USB bus registered, assigned bus number 4
> 	xhci-hcd xhci-hcd.5.auto: Host supports USB 3.1 Enhanced SuperSpeed
> 	hub 3-0:1.0: USB hub found
> 	hub 3-0:1.0: 1 port detected
> 	hub 4-0:1.0: USB hub found
> 	hub 4-0:1.0: 1 port detected
> 
> Once this happens on either of the two ports, no amount of disconnecting
> and reconnecting makes the SuperSpeed device be enumerated, while
> FullSpeed device enumeration still works.
> 
> With retimer (and orientation detection) support not even merged yet,
> let's revert at least until we have stable host mode in mainline.
> 
> Fixes: 1a48dd7b9ac8 ("arm64: dts: qcom: x1e78100-t14s: enable otg on usb-c ports")
> Cc: Jonathan Marek <jonathan@...ek.ca>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Abel Vesa <abel.vesa@...aro.org>

> ---
> 
> I have not been able to reproduce this on the (third port of) the CRD,
> but I hit this constantly with the T14s so let's start with reverting
> there.
> 
> Note that Stephan has already identified another problem with the
> offending commit here:
> 
> 	https://lore.kernel.org/all/ZxZO6Prrm2ITUZMQ@linaro.org/
> 
> Johan
> 
> 
> #regzbot introduced: 1a48dd7b9ac8
> 
> 
> 
>  .../arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
> index 5a4a72a030d4..b4b6260c670c 100644
> --- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
> @@ -1515,6 +1515,10 @@ &usb_1_ss0 {
>  	status = "okay";
>  };
>  
> +&usb_1_ss0_dwc3 {
> +	dr_mode = "host";
> +};
> +
>  &usb_1_ss0_dwc3_hs {
>  	remote-endpoint = <&pmic_glink_ss0_hs_in>;
>  };
> @@ -1543,6 +1547,10 @@ &usb_1_ss1 {
>  	status = "okay";
>  };
>  
> +&usb_1_ss1_dwc3 {
> +	dr_mode = "host";
> +};
> +
>  &usb_1_ss1_dwc3_hs {
>  	remote-endpoint = <&pmic_glink_ss1_hs_in>;
>  };
> -- 
> 2.45.2
>