linux-kernel - Re: [PATCH 1/2] mmc: bcm2835: reset host on timeout

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Date:   Sun, 4 Mar 2018 19:11:49 +0100 (CET)
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Michal Suchánek <msuchanek@...e.de>
Cc:     Eric Anholt <eric@...olt.net>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-rpi-kernel@...ts.infradead.org,
        Phil Elwell <phil@...pberrypi.org>,
        Gerd Hoffmann <kraxel@...hat.com>, linux-mmc@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] mmc: bcm2835: reset host on timeout

Hi Michal,

> Michal Suchánek <msuchanek@...e.de> hat am 4. März 2018 um 16:57 geschrieben:
> 
> 
> On Wed, 14 Feb 2018 21:30:16 +0100 (CET)
> Stefan Wahren <stefan.wahren@...e.com> wrote:
> 
> > Hi Michal,
> > 
> > > Michal Suchánek <msuchanek@...e.de> hat am 14. Februar 2018 um
> > > 20:24 geschrieben:
> > > 
> > > 
> > > On Wed, 14 Feb 2018 17:49:31 +0100
> > > Stefan Wahren <stefan.wahren@...e.com> wrote:
> > >   
> > > > Hi Michal,
> > > > 
> > > > [add Phil]
> > > > 
> > > > Am 14.02.2018 um 17:13 schrieb Michal Suchánek:  
> > > > > On Wed, 14 Feb 2018 16:36:49 +0100
> > > > > Michal Suchánek <msuchanek@...e.de> wrote:
> > > > >    
> > > > >> On Wed, 14 Feb 2018 15:58:31 +0100
> > > > >> Stefan Wahren <stefan.wahren@...e.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)?   
> > > > > It tends to reproduce when upgrading a few packages with zypper
> > > > > and otherwise at random during system operation. It seems that
> > > > > for my card it worsens with age to some degree so perhaps it
> > > > > depends on the fragmentation of the internal card flash.
> > > > >
> > > > > Attaching dmesg and kernel config.    
> > > > 
> > > > do you noticed this issue before 4.15-rc4?  
> > > 
> > > I initially noticed it with 4.4 kernel with some backports to make
> > > it bootable on RPi.  
> > 
> > this confuses me. Gerd and i ported this driver from downstream and
> > finally it's got merged in 4.12. 
> > 
> > So do you mean that you backported the mainline version to 4.4 or the
> > downstream version of 4.4?
> 
> I did not backport it but looking at the changelog it is backport of
> the 4.12 driver. It does not look as the 4.15 driver though. Looks like
> there was some reorganization of the bcm mmc since then.
> 
> > 
> > On a quick look they seems identical, but they aren't.
> > 
> > > > 
> > > > Could you please test with 4.15 final again?  
> > >
> 
> I tried upgrading to the current master (4.16-rc3+) and the issue is
> still reproducible although less frequent. I did full upgrade from the
> install image which installs over 300 packages and the issue triggered
> somewhere around 200th while before installing a half dozen packages
> would usually trigger it.
> 

this is the same what i did during my stress tests. The step installed 475 packages. The timeout never occured.

Stefan