linux-kernel - Re: [PATCH] regulator: qcom-rpmh: Revert "regulator: qcom-rpmh: Use PROBE_FORCE

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Date:   Fri, 2 Jun 2023 13:37:26 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Amit Pundir <amit.pundir@...aro.org>
Cc:     Doug Anderson <dianders@...omium.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: qcom-rpmh: Revert "regulator: qcom-rpmh: Use
 PROBE_FORCE_SYNCHRONOUS"

On Fri, Jun 02, 2023 at 01:00:52PM +0530, Amit Pundir wrote:
> On Thu, 1 Jun 2023 at 19:35, Doug Anderson <dianders@...omium.org> wrote:
> > On Wed, May 31, 2023 at 11:11 PM Amit Pundir <amit.pundir@...aro.org> wrote:
> > > On Wed, 17 May 2023 at 02:54, Doug Anderson <dianders@...omium.org> wrote:
> > > > On Tue, May 16, 2023 at 11:12 AM Amit Pundir <amit.pundir@...aro.org> wrote:
> > > > > On Mon, 15 May 2023 at 20:33, Doug Anderson <dianders@...omium.org> wrote:
> > > > > > On Mon, May 15, 2023 at 7:42 AM Amit Pundir <amit.pundir@...aro.org> wrote:
> > > > > > > On Sun, 14 May 2023 at 18:11, Caleb Connolly <caleb.connolly@...aro.org> wrote:

Please delete unneeded context from mails when replying.  Doing this
makes it much easier to find your reply in the message, helping ensure
it won't be missed by people scrolling through the irrelevant quoted
material.

> > If you reorder the nodes in the device tree, I think it'll change the
> > probe order. Does that affect anything? I'm wondering if there's some
> > sort of delayed reaction from a previous regulator.

> Hi, Bumping lvs1 and lvs2 regulators up to the top of the list in the
> DTS https://bugs.linaro.org/show_bug.cgi?id=5975#c4 does seem to work.
> I can't reproduce the crash in 125 reboots so far, while I'm still
> testing with only qcom-rpmh-regulator kernel module. I'll do some more
> testing with full system running and send this re-ordering fix I can't
> reproduce the crash further.

So whatever the issue is here it's a timing/race condition - this seems
like a workaround which works just now but it's not getting to whatever
the actual issue is and that could come back.

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