linux-kernel - Re: SDHCI: Ricoh [1180:e823] unable to mount MMC cards.

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Message-ID: <m3vcyzuols.fsf@pullcord.laptop.org>
Date:	Thu, 31 Mar 2011 14:33:19 -0400
From:	Chris Ball <cjb@...top.org>
To:	Manoj <manoj.iyer@...onical.com>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Philip Langdale <philipl@...rt.org>
Subject: Re: SDHCI: Ricoh [1180:e823] unable to mount MMC cards.

Hi Manoj,

On Thu, Mar 31 2011, Manoj wrote:
> Card did not mount. New dmesg is attached.

Okay.  There's nothing in the log about Ricoh, which probably means that
it bailed out early in the function.  You could add a printk to the top
of ricoh_mmc_fixup_rl5c476() if you want to be really sure that the code
there is getting a chance to run.

I think the likely conclusion is that:

(a) The Ricoh controller has a proprietary MMC function that is stealing
    MMC cards away from the SDHCI controller even though the SDHCI could
    read them if it had a chance to.

(b) We don't know how to turn the MMC controller off, because our old
    method for doing so isn't working on this new 0xe823 model.

I'm adding a few people who've touched this code to CC: in case they
have any ideas on working out how to disable the MMC function.  If you
have contact with Ricoh directly or through a vendor, please ask them
for the PCI configuration writes needed to disable the MMC function on
this model so that you can read MMC cards with the SD interface instead.

Thanks,

- Chris.
-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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