linux-kernel - Re: [PATCH V7 0/2] qcom: x1e80100: Enable CPUFreq

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Message-ID: <ZypOY-NCDN9fdMAR@hovoldconsulting.com>
Date: Tue, 5 Nov 2024 17:57:07 +0100
From: Johan Hovold <johan@...nel.org>
To: Marc Zyngier <maz@...nel.org>, Sibi Sankar <quic_sibis@...cinc.com>
Cc: sudeep.holla@....com, cristian.marussi@....com, andersson@...nel.org,
	konrad.dybcio@...aro.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, dmitry.baryshkov@...aro.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, quic_rgottimu@...cinc.com,
	quic_kshivnan@...cinc.com, conor+dt@...nel.org,
	quic_nkela@...cinc.com, quic_psodagud@...cinc.com,
	abel.vesa@...aro.org
Subject: Re: [PATCH V7 0/2] qcom: x1e80100: Enable CPUFreq

On Fri, Nov 01, 2024 at 02:43:57PM +0000, Marc Zyngier wrote:
> On Fri, 01 Nov 2024 14:19:54 +0000,
> Johan Hovold <johan@...nel.org> wrote:

> > The side-effects and these remaining warnings are addressed by this
> > series:
> > 
> > 	https://lore.kernel.org/all/20241030125512.2884761-1-quic_sibis@quicinc.com/
> > 
> > but I think we should try to make the warnings a bit more informative
> > (and less scary) by printing something along the lines of:
> > 
> > 	arm-scmi arm-scmi.0.auto: [Firmware Bug]: Ignoring duplicate OPP 3417600 for NCC
> > 
> > instead.
> 
> Indeed. Seeing [Firmware Bug] has a comforting feeling of
> familiarity... :)
> 
> I wonder whether the same sort of reset happen on more "commercial"
> systems (such as some of the laptops). You expect that people look at
> the cpufreq stuff closely, and don't see things exploding like we are.

I finally got around to getting my Lenovo ThinkPad T14s to boot (it
refuses to start the kernel when using GRUB, and it's not due to the
known 64 GB memory issue as it only has 32 GB) and can confirm that it
hard resets when accessing the cpufreq sysfs attributes as well.

On the bright side, at least I don't see any warnings due to duplicate
OPPs on this machine (x1e78100, latest UEFI fw).

Johan