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

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On Thu, 31 Mar 2011 14:33:19 -0400, Chris Ball <cjb@xxxxxxxxxx> 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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