linux-kernel - Re: [PATCH] soc: qcom: pmic_glink: enable UCSI on sc8280xp

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Message-ID: <Z+UF0P5HHzqwejYc@linaro.org>
Date: Thu, 27 Mar 2025 10:01:20 +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>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: Re: [PATCH] soc: qcom: pmic_glink: enable UCSI on sc8280xp

On 25-03-26 13:49:44, Johan Hovold wrote:
> Commit ad3dd9592b2a ("soc: qcom: pmic_glink: disable UCSI on sc8280xp")
> disabled UCSI shortly after it had been enabled to fix a regression that
> was observed on the Lenovo ThinkPad X13s.
> 
> Specifically, disconnecting an external display would trigger a system
> error and hypervisor reset but no one cared enough to track down the bug
> at the time.
> 
> The same issue was recently observed on X Elite machines, and commit
> f47eba045e6c ("usb: typec: ucsi: Set orientation as none when connector
> is unplugged") worked around the underlying issue by setting the
> connector orientation to 'none' on disconnect events to avoid having the
> PHY driver crash the machine in one orientation.
> 
> Enable UCSI support also on sc8280xp now that the DisplayPort disconnect
> crashes are gone.
> 
> Cc: Abel Vesa <abel.vesa@...aro.org>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

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