linux-kernel - Re: strange problem with ricoh-mmc

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Message-ID: <1275509965.6277.5.camel@maxim-laptop>
Date:	Wed, 02 Jun 2010 23:19:25 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Philip Langdale <philipl@...rt.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: strange problem with ricoh-mmc

On Wed, 2010-06-02 at 15:54 -0400, Philip Langdale wrote: 
> On Wed, 02 Jun 2010 21:56:58 +0300, Maxim Levitsky
> <maximlevitsky@...il.com> wrote:
> > Hi,
> > 
> > Maybe this is my fault, don't know, but I found and now confident that
> > new and possible old version of ricoh-mmc causes troubles after
> > suspend/resume.
> > 
> > Namely there are two problems.
> > One is that sometimes card detection on xD controller stops working.
> > That is it doesn't respond to insert/remove events, and suspend to ram
> > just updates that once. Granted I wrote this driver, but it appears to
> > work without richoh-mmc.
> > 
> > Another problem that is unrelated to xD is that sometimes sdhci
> > conroller issues an interrupt storm, and does so until its driver is
> > reloaded. At that point it refuses to load with missing voltage levels.
> > 
> > I never seen these without ricoh-mmc pci quirk.
> > 
> > Both problems are semi-rare.
> > 
> > So just one question, did you see these problems?
> > Do you have a clue on how to proceed?
> 
> I have never seen these problems, but I could imagine that perhaps the
> PCI register pokes have side-effects or there's actually more that needs
> to be done than what we currently have. No one has access to the relevant
> datasheets so the magic incantations are second hand. More worryingly, it
> may not be a well supported configuration - while the other controllers
> might be disabled based on physical slot design, SD and MMC are the same,
> so I doubt Ricoh or OEMs have ever seriously considered having only one
> on. I've not heard of the sdhci problem before - maybe your hardware is
> dodgy? :-)


Thanks.
I some future I maybe consider reverse engineering  the MMC controller.

Best regards,
Maxim Levitsky

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