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 13:41:44 -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 12:31 PM Adam Ford <aford173@...il.com> wrote:
>
> On Fri, Jan 8, 2021 at 7:45 AM Adam Ford <aford173@...il.com> wrote:
> >
> > 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 do see chatter.

[   15.531005] ti-soc-thermal 48002524.bandgap: eocz timed out waiting low
[   16.571075] ti-soc-thermal 48002524.bandgap: eocz timed out waiting low
[   17.610961] ti-soc-thermal 48002524.bandgap: eocz timed out waiting low

and it repeats quite often.

I would say this patch series would cause a regression on the DM3730.

adam


> >
> > I should be able to try it on the dm3730 logicpd-torpedo kit this weekend.
>
> I am going to be a bit delayed testing this.  I cannot boot omap2plus
> using Linux version 5.11.0-rc2.
>
> [    2.666748] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xbc
> [    2.673309] nand: Micron MT29F4G16ABBDA3W
> [    2.677368] nand: 512 MiB, SLC, erase size: 128 KiB, page size:
> 2048, OOB size: 64
> [    2.685119] nand: using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW
> [    2.693237] Invalid ECC layout
> [    2.696350] omap2-nand 30000000.nand: unable to use BCH library
> [    2.702575] omap2-nand: probe of 30000000.nand failed with error -22
> [    2.716094] 8<--- cut here ---
> [    2.719207] Unable to handle kernel NULL pointer dereference at
> virtual address 00000018
> [    2.727600] pgd = (ptrval)
> ...
> [    3.050933] ---[ end trace 59640c7399a80a07 ]---
> [    3.055603] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x0000000b
> [    3.063323] ---[ end Kernel panic - not syncing: Attempted to kill
> init! exitcode=0x0000000b ]---
>
> Once I get past this, I'll try to test the thermal stuff.
>
> adam
>
> >
> > adam
> > >
> > > Regards,
> > >
> > > Tony