linux-kernel - Re: [PATCH] soc: qcom: pmic

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Date: Thu, 14 Dec 2023 12:44:10 -0800
From: Rob Clark <robdclark@...il.com>
To: Johan Hovold <johan@...nel.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, linux-arm-msm@...r.kernel.org, 
	Rob Clark <robdclark@...omium.org>, Andy Gross <agross@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] soc: qcom: pmic_glink: Fix boot when QRTR=m

On Thu, Dec 14, 2023 at 8:08 AM Johan Hovold <johan@...nel.org> wrote:
>
> On Thu, Dec 14, 2023 at 04:38:35PM +0100, Johan Hovold wrote:
>
> > I took a closer look at this and indeed we do have code that triggers a
> > reprobe of a device in case there was a successful probe while the
> > device was probing.
> >
> > This was introduced by commit 58b116bce136 ("drivercore: deferral race
> > condition fix") and the workaround for the reprobe-loop bug that hack
> > led to is to not return -EPROBE_DEFER after registering child devices as
> > no one managed to come up with a proper fix. This was documented here:
> >
> >       fbc35b45f9f6 ("Add documentation on meaning of -EPROBE_DEFER")
> >
> > But please spell this out in some more detail in the commit message, and
> > add a Fixes and CC stable tag.
>
> And please update the commit summary as I've been booting with QRTR=m
> all along just fine. I guess the issue is if you have pmic_glink
> built-in or in the initramfs but forgot to include qrtr or similar?

I do have both QRTR=m and QCOM_GLINK=m.  I'm honestly not sure what
started triggering this issue for me.. it seemed to have started after
merging msm-next + drm-misc-next on top of your
jhovold/wip/sc8280xp-v6.7-rc5 (the merged branches were based on -rc3
so this shouldn't have really brought in random non-drm things).
Maybe there is a timing element to it?  I felt like the problem was
obvious enough, and the exact details of why I started hitting this
were not important enough to spend time tracking down.

BR,
-R

> Johan