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From: "Michal Suchánek" <msuchanek@suse.de>
To: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Michal Suchanek <msuchanek@suse.de>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com,
	Eric Anholt <eric@anholt.net>, Gerd Hoffmann <kraxel@redhat.com>,
	"Gustavo A. R. Silva" <garsilva@embeddedor.com>,
	Julia Lawall <Julia.Lawall@lip6.fr>,
	linux-mmc@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mmc: bcm2835: reset host on timeout
Date: Wed, 14 Feb 2018 16:36:49 +0100	[thread overview]
Message-ID: <20180214163649.3a0c9476@kitsune.suse.cz> (raw)
In-Reply-To: <1fbf0d77-cb53-f0fa-b810-e9954138d907@i2se.com>

On Wed, 14 Feb 2018 15:58:31 +0100
Stefan Wahren <stefan.wahren@i2se.com> wrote:

> Hi Michal,
> 
> Am 14.02.2018 um 15:38 schrieb Michal Suchanek:
> > The bcm2835 mmc host tends to lock up for unknown reason so reset
> > it on timeout. The upper mmc block layer tries retransimitting with
> > single blocks which tends to work out after a long wait.
> >
> > This is better than giving up and leaving the machine broken for no
> > obvious reason.  
> 
> could you please provide more information about this issue (affected
> hardware, kernel config, version, dmesg, reproducible scenario)?
> 

The RPi3 is known to not work with some SD cards. You can find some
wiki pages with large tables of known-working and known-broken cards. I
have a couple of RPi3 boards and a card that works and card that does
not. I tried debugging the issue but did not find anything I can do
about it - AFAICT the issue happens somewhere inside the MMC controller
IP. 

I have no inside knowledge of the controller in question but during
testing I tried to reset the controller whenever the issue happens so I
can continue running the test system for a longer time until it gets
unusable. While I did not find any solution to the problem the
workaround with resetting the controller works quite reliably for me.

So I am posting it in the hope that people with the wrong combination
of RPi3 and SD card will not get a blank screen but rather a system
that boots but tends to lock up for half a minute occasionally.

Thanks

Michal

WARNING: multiple messages have this Message-ID (diff)
From: msuchanek@suse.de (Michal Suchánek)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] mmc: bcm2835: reset host on timeout
Date: Wed, 14 Feb 2018 16:36:49 +0100	[thread overview]
Message-ID: <20180214163649.3a0c9476@kitsune.suse.cz> (raw)
In-Reply-To: <1fbf0d77-cb53-f0fa-b810-e9954138d907@i2se.com>

On Wed, 14 Feb 2018 15:58:31 +0100
Stefan Wahren <stefan.wahren@i2se.com> wrote:

> Hi Michal,
> 
> Am 14.02.2018 um 15:38 schrieb Michal Suchanek:
> > The bcm2835 mmc host tends to lock up for unknown reason so reset
> > it on timeout. The upper mmc block layer tries retransimitting with
> > single blocks which tends to work out after a long wait.
> >
> > This is better than giving up and leaving the machine broken for no
> > obvious reason.  
> 
> could you please provide more information about this issue (affected
> hardware, kernel config, version, dmesg, reproducible scenario)?
> 

The RPi3 is known to not work with some SD cards. You can find some
wiki pages with large tables of known-working and known-broken cards. I
have a couple of RPi3 boards and a card that works and card that does
not. I tried debugging the issue but did not find anything I can do
about it - AFAICT the issue happens somewhere inside the MMC controller
IP. 

I have no inside knowledge of the controller in question but during
testing I tried to reset the controller whenever the issue happens so I
can continue running the test system for a longer time until it gets
unusable. While I did not find any solution to the problem the
workaround with resetting the controller works quite reliably for me.

So I am posting it in the hope that people with the wrong combination
of RPi3 and SD card will not get a blank screen but rather a system
that boots but tends to lock up for half a minute occasionally.

Thanks

Michal

  reply	other threads:[~2018-02-14 15:36 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-14 14:38 [PATCH 1/2] mmc: bcm2835: reset host on timeout Michal Suchanek
2018-02-14 14:38 ` Michal Suchanek
2018-02-14 14:38 ` [PATCH 2/2] mmc: bcm2835: print some informational messages during reset Michal Suchanek
2018-02-14 14:38   ` Michal Suchanek
2018-02-14 16:50   ` Florian Fainelli
2018-02-14 16:50     ` Florian Fainelli
2018-02-14 16:50   ` Florian Fainelli
2018-02-14 16:50     ` Florian Fainelli
2018-02-14 19:47     ` Michal Suchánek
2018-02-14 19:47       ` Michal Suchánek
2018-02-15 18:22       ` Stefan Wahren
2018-02-15 18:22         ` Stefan Wahren
2018-03-04 15:46         ` Michal Suchánek
2018-03-04 15:46           ` Michal Suchánek
2018-02-14 14:58 ` [PATCH 1/2] mmc: bcm2835: reset host on timeout Stefan Wahren
2018-02-14 14:58   ` Stefan Wahren
2018-02-14 15:36   ` Michal Suchánek [this message]
2018-02-14 15:36     ` Michal Suchánek
2018-02-14 15:58     ` Michal Suchánek
2018-02-14 16:13       ` Michal Suchánek
2018-02-14 16:49       ` Stefan Wahren
2018-02-14 16:49         ` Stefan Wahren
2018-02-14 19:24         ` Michal Suchánek
2018-02-14 19:24           ` Michal Suchánek
2018-02-14 20:30           ` Stefan Wahren
2018-02-14 20:30             ` Stefan Wahren
2018-03-04 15:57             ` Michal Suchánek
2018-03-04 15:57               ` Michal Suchánek
2018-03-04 18:11               ` Stefan Wahren
2018-03-04 18:11                 ` Stefan Wahren
2018-03-04 18:11                 ` Stefan Wahren
2018-03-04 18:44                 ` Michal Suchánek
2018-03-04 18:44                   ` Michal Suchánek
2018-03-03 13:58           ` Stefan Wahren
2018-03-03 13:58             ` Stefan Wahren
2018-03-04 16:04             ` Michal Suchánek
2018-03-04 16:04               ` Michal Suchánek
2018-03-04 16:36             ` Michal Suchánek
2018-03-04 16:36               ` Michal Suchánek
2018-03-04 18:15               ` Stefan Wahren
2018-03-04 18:15                 ` Stefan Wahren
2018-03-04 18:15                 ` Stefan Wahren
2018-03-06 19:21             ` Michal Suchánek
2018-03-06 19:21               ` Michal Suchánek

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