linux-kernel - Re: [PATCH 1/3] thermal: ti-soc-thermal: Fix stuck sensor with continuous mode for 4430

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Date:   Fri, 8 Jan 2021 07:45:44 -0600
From:   Adam Ford <aford173@...il.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Amit Kucheria <amitk@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Keerthy <j-keerthy@...com>, linux-pm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        Carl Philipp Klemm <philipp@...s.xyz>,
        Merlijn Wajer <merlijn@...zup.org>,
        Pavel Machek <pavel@....cz>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Andreas Kemnade <andreas@...nade.info>
Subject: Re: [PATCH 1/3] thermal: ti-soc-thermal: Fix stuck sensor with
 continuous mode for 4430

On Fri, Jan 8, 2021 at 1:22 AM Tony Lindgren <tony@...mide.com> wrote:
>
> * H. Nikolaus Schaller <hns@...delico.com> [201230 13:29]:
> > > Am 30.12.2020 um 13:55 schrieb Adam Ford <aford173@...il.com>:
> > > On Wed, Dec 30, 2020 at 2:43 AM Tony Lindgren <tony@...mide.com> wrote:
> > >>
> > >> At least for 4430, trying to use the single conversion mode eventually
> > >> hangs the thermal sensor. This can be quite easily seen with errors:
> > >>
> > >> thermal thermal_zone0: failed to read out thermal zone (-5)
> ...
>
> > > I don't have an OMAP4, but if you want, I can test a DM3730.
> >
> > Indeed I remember a similar discussion from the DM3730 [1]. temp values were
> > always those from the last measurement. E.g. the first one was done
> > during (cold) boot and the first request after 10 minutes did show a
> > quite cold system... The next one did show a hot system independent
> > of what had been between (suspend or high activity).
> >
> > It seems as if it was even reproducible with a very old kernel on a BeagleBoard.
> > So it is quite fundamental.
> >
> > We tried to fix it but did not come to a solution [2]. So we opened an issue
> > in our tracker [3] and decided to stay with continuous conversion although this
> > raises idle mode processor load.
>
> Hmm so maybe eocz high always times out in single mode since it also
> triggers at least on dra7?
>
> Yes it would be great if you guys can the $subject patch a try at
> least on your omap36xx and omap5 boards and see if you see eocz
> time out warnings in dmesg.

I should be able to try it on the dm3730 logicpd-torpedo kit this weekend.

adam
>
> Regards,
>
> Tony