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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/