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

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Message-ID: <d21c920c680eac13afdf6b214627325e@mail.overt.org>
Date:	Thu, 31 Mar 2011 11:47:46 -0700
From:	Philip Langdale <philipl@...rt.org>
To:	Chris Ball <cjb@...top.org>
Cc:	Manoj <manoj.iyer@...onical.com>, <linux-mmc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: SDHCI: Ricoh [1180:e823] unable to mount MMC cards.

 On Thu, 31 Mar 2011 14:33:19 -0400, Chris Ball <cjb@...top.org> wrote:
> 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.

 For what it's worth, I previously investigated a Dell e6400 with an 
 0x822
 and an 0x823 and even without the MMC function disabled, the SD 
 function
 would get the SD card. The machine I currently have access to just has
 the 0x822 function so I doubt it can be used to prove anything.

 I was under the impression they'd changed the priority of the 
 controllers
 (and probably requiring the MMC driver to set a flag to make it steal
 cards)

 --phil
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