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Date: Wed, 29 May 2024 09:55:55 +0200
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From: Neil Armstrong <neil.armstrong@linaro.org>
Reply-To: neil.armstrong@linaro.org
Subject: Re: [PATCH v2 0/7] arm64: qcom: allow up to 4 lanes for the Type-C
 DisplayPort Altmode
To: Bjorn Andersson <andersson@kernel.org>
Cc: Vinod Koul <vkoul@kernel.org>, Kishon Vijay Abraham I
 <kishon@kernel.org>, Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor Dooley
 <conor+dt@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
 devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20240527-topic-sm8x50-upstream-phy-combo-typec-mux-v2-0-a03e68d7b8fc@linaro.org>
 <wipu6tdqjbjlrv2sbljgzvoxvpjvkoaz6ic3keq24n3v4tap4j@entxhnd42rml>
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On 28/05/2024 15:48, Bjorn Andersson wrote:
> On Mon, May 27, 2024 at 10:42:32AM GMT, Neil Armstrong wrote:
>> Register a typec mux in order to change the PHY mode on the Type-C
>> mux events depending on the mode and the svid when in Altmode setup.
>>
>> The DisplayPort phy should be left enabled if is still powered on
>> by the DRM DisplayPort controller, so bail out until the DisplayPort
>> PHY is not powered off.
>>
>> The Type-C Mode/SVID only changes on plug/unplug, and USB SAFE states
>> will be set in between of USB-Only, Combo and DisplayPort Only so
>> this will leave enough time to the DRM DisplayPort controller to
>> turn of the DisplayPort PHY.
>>
>> The patchset also includes bindings changes and DT changes.
>>
>> This has been successfully tested on an SM8550 board, but the
>> Thinkpad X13s deserved testing between non-PD USB, non-PD DisplayPort,
>> PD USB Hubs and PD Altmode Dongles to make sure the switch works
>> as expected.
>>
>> The DisplayPort 4 lanes setup can be check with:
>> $ cat /sys/kernel/debug/dri/ae01000.display-controller/DP-1/dp_debug
>> 	name = msm_dp
>> 	drm_dp_link
>> 		rate = 540000
>> 		num_lanes = 4
> 
> Has the issue with the USB controller dying on us been resolved?

No, this would require some changes in dwc3 & ucsi to support the USB_ROLE_NONE

I haven't looked into this yet.

Neil

> 
> Regards,
> Bjorn