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Date:   Sat, 11 Dec 2021 08:57:51 +0200
From:   Tony Lindgren <tony@atomide.com>
To:     Merlijn Wajer <merlijn@wizzup.org>
Cc:     Aaro Koskinen <aaro.koskinen@iki.fi>,
        "Merlijn B.W. Wajer" <merlijn@archive.org>,
        Andreas Kemnade <andreas@kemnade.info>,
        Pavel Machek <pavel@ucw.cz>,
        linux-omap <linux-omap@vger.kernel.org>,
        Dev Null <devnull@uvos.xyz>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>,
        Sebastian Reichel <sre@kernel.org>,
        "H. Nikolaus Schaller" <hns@goldelico.com>
Subject: Re: Oops while booting 5.15.2 on Nokia N900
Message-ID: <YbRL75F/SlcPJjtf@atomide.com>
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* Merlijn Wajer <merlijn@wizzup.org> [211210 23:41]:
> Hi Aaro,
> 
> On 10/12/2021 12:13, Aaro Koskinen wrote:
> > Hi,
> > 
> > On Wed, Dec 08, 2021 at 11:34:53PM +0100, Merlijn B.W. Wajer wrote:
> >> What I have seen is that if off mode is enabled from userspace
> >> (debugfs), it does not cause a problem (or I don't hit the problem at
> >> least). That said, my off mode tests are pretty minimal with
> >> init=/bin/sh, and I haven't gotten a fully booted (with lots of modules
> >> loaded, gui and daemons) system to enter off mode yet.
> > 
> > I also started seeing crashes with fb2c599f0566 on N900. It's been several
> > months since I last tested, but I remember I was able to trigger the
> > crashes reliably with MMC access from the minimal shell enviroment.
> > I see the MMC is also visible in your crash logs. My test case was
> > something like "sleep 30 ; blkid ; sleep 30".
> 
> Thanks for this info -- I can confirm, I see the same when I do this:
> 
> 1. boot to init=/bin/bash
> 
> 2. run:
> 
> > modprobe panel-sony-acx565akm
> > 
> > mount -t proc none /proc
> > mount -t sysfs none /sys
> > mount -t debugfs none /sys/kernel/debug
> > mount -o rw,remount /
> > 
> > echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode
> > echo 0 > /sys/class/backlight/acx565akm/brightness
> 
> 3. run:
> 
> > sleep 30 ; blkid
> 
> So we have a pretty reproducible test case here I think.

Just to see if this relates to the omap_hsmmc.c driver, maybe try this with
v5.16-rc1 also with a patch that changes omap3.dtsi ti,omap3-hsmmc compatibles
with ti,omap3-sdhci compatibles.

Regards,

Tony