linux-kernel - Re: [PATCH 0/3] Fix for KSZ DSA switch shutdown

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Message-ID: <20210914184856.vmqv3je4oz5elxvp@skbuf>
Date:   Tue, 14 Sep 2021 21:48:56 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Lino Sanfilippo <LinoSanfilippo@....de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Saravana Kannan <saravanak@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>, p.rosenberger@...bus.com,
        woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        vivien.didelot@...il.com, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Fix for KSZ DSA switch shutdown

On Mon, Sep 13, 2021 at 01:01:20PM +0200, Lino Sanfilippo wrote:
> > > > Could you post the full kernel output? The picture you've posted is
> > > > truncated and only shows a WARN_ON in rpi_firmware_transaction and is
> > > > probably a symptom and not the issue (which is above and not shown).
> > > >
> > >
> > > Unfortunately I dont see anything in the kernel log. The console output is all I get,
> > > thats why I made the photo.
> >
> > To clarify, are you saying nothing above this line gets printed? Because
> > the part of the log you've posted in the picture is pretty much
> > unworkable:
> >
> > [   99.375389] [<bf0dc56c>] (bcm2835_spi_shutdown [spi_bcm2835]) from [<c0863ca0>] (platform_drv_shutdown+0x2c/0x30)
> >
> > How do you access the device's serial console? Use a program with a
> > scrollback buffer like GNU screen or something.
> >
> 
> Ah no, this is not over a serial console. This is what I see via hdmi. I do not have a working serial connection yet.
> Sorry I know this trace part is not very useful, I will try to get a full dump.

Lino, are you going to provide a kernel output so I could look at your new breakage?
If you could set up a pstore logger with a ramoops region, you could
dump the log after the fact. Or if HDMI is all you have, you could use
an HDMI capture card to record it. Or just record the screen you're
looking at, as long as you don't have very shaky hands, whatever...