linux-kernel - Re: [PATCH v2 0/2] arm64: dts: qcom: x1e80100: fix USB OTG regressions

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Message-ID: <Z1gbyXk-SktGjL6-@hovoldconsulting.com>
Date: Tue, 10 Dec 2024 11:45:29 +0100
From: Johan Hovold <johan@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Johan Hovold <johan+linaro@...nel.org>,
	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>,
	Jonathan Marek <jonathan@...ek.ca>,
	Stephan Gerhold <stephan.gerhold@...aro.org>,
	Abel Vesa <abel.vesa@...aro.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	regressions@...ts.linux.dev
Subject: Re: [PATCH v2 0/2] arm64: dts: qcom: x1e80100: fix USB OTG
 regressions

On Mon, Dec 09, 2024 at 06:00:21PM +0200, Dmitry Baryshkov wrote:
> On Mon, 9 Dec 2024 at 17:30, Johan Hovold <johan@...nel.org> wrote:
> > On Mon, Dec 09, 2024 at 03:23:05PM +0200, Dmitry Baryshkov wrote:
> > > On Mon, Dec 09, 2024 at 12:19:03PM +0100, Johan Hovold wrote:
> > > > A recent change enabling OTG mode on the Lenovo ThinkPad T14s USB-C
> > > > ports can break SuperSpeed device hotplugging.
> > > >
> > > > Abel noticed that the corresponding commit for the CRD also triggers a
> > > > hard reset during resume from suspend.
> > > >
> > > > With retimer (and orientation detection) support not even merged yet,
> > > > let's revert at least until we have stable host mode in mainline.
> > > >
> > > > Note that Stephan and Dmitry have already identified other problems with
> > > > the offending commits here:
> > > >
> > > >     https://lore.kernel.org/all/ZxZO6Prrm2ITUZMQ@linaro.org/
> > > >     https://lore.kernel.org/all/hw2pdof4ajadjsjrb44f2q4cz4yh5qcqz5d3l7gjt2koycqs3k@xx5xvd26uyef
> >
> > > > Changes in v2
> > > >  - revert also the corresponding patch for the CRD which breaks suspend
> > >
> > > As you are reverting two commits, please revert the third one too, it
> > > breaks pmic-glink.
> >
> > Can you be more specific?
> >
> > I was gonna say that pmic_glink works since hotplug and orientation
> > detection still works, but I tested now with DP altmode and that is
> > indeed broken unless I revert the third commit (f042bc234c2e ("arm64:
> > dts: qcom: x1e80100: enable OTG on USB-C controllers")).
> >
> > Was that what you had in mind? Can you explain why that breaks?
> 
> See https://linux-regtracking.leemhuis.info/regzbot/regression/lore/hw2pdof4ajadjsjrb44f2q4cz4yh5qcqz5d3l7gjt2koycqs3k@xx5xvd26uyef/
> 
> For some reason commit f042bc234c2e ("arm64: dts: qcom: x1e80100: enable
> OTG on USB-C controllers") seems to break UCSI on X1E80100 CRD:
> 
> [   34.479352] ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: PPM init
> failed, stop trying

Ok, so you're referring to your UCSI report that I linked to above.

With the full series applied, I typically do *not* see the PPM init
error message, so it does not seem directly related to the regressions I
reported. DP still works even when SS hotplug does not.

With only the first patch applied, I do see the PPM init error on every
boot and DP is broken. Hotplug and orientation detection still works
though:

[   19.698560] ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: PPM init failed, stop trying
[   45.100142] r8152-cfgselector 4-1: USB disconnect, device number 2
[   47.380999] usb 4-1: new SuperSpeed USB device number 3 using xhci-hcd
[   47.549862] r8152-cfgselector 4-1: reset SuperSpeed USB device number 3 using xhci-hcd
[   47.630710] r8152 4-1:1.0 eth0: v1.12.13
[   50.591050] r8152 4-1:1.0 eth0: carrier on
[   50.892296] r8152-cfgselector 4-1: USB disconnect, device number 3
[   55.517111] usb 4-1: new SuperSpeed USB device number 4 using xhci-hcd
[   55.694021] r8152-cfgselector 4-1: reset SuperSpeed USB device number 4 using xhci-hcd

> > I'll respin with a v3, but please answer the above first.

I'll revert the first patch as well.

Johan