Messages in this thread | | | Subject | Re: SDHCI: Ricoh [1180:e823] unable to mount MMC cards. | Date | Thu, 31 Mar 2011 11:47:46 -0700 | From | Philip Langdale <> |
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On Thu, 31 Mar 2011 14:33:19 -0400, Chris Ball <cjb@laptop.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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