There are a lot of conflicting reports against this bug.
1. The CONFIG_SYSFS_DEPRECATED thread is not applicable to this bug.
2. The sudo setpci -s nn:nn.n 4c.b=0x02 fix doesn't fix the underlying
problem. The TI MMC card readers support two interfaces: the
proprietary TI interface, and the generic "Secure Digital Host
Controller Interface". Only one of these interfaces are connected to
the physical pins of the MMC reader at any one time. Normally the
physical pins are connected to the proprietary interface, which is
supported by the broken tifm_sd driver.
The setpci command switches the physical pins to the "Secure Digital
Host Controller Interface" supported by the sdhci driver. This command
in effect moves the responsibility of reading/writing the MMC card to
the working sdhci driver.
3. The tifm_sd driver is obviously broken. Hopefully, the patch
referred to in a previous comment will fix the driver, although this is
far from being definate.
I will evaluate the patch, and consider applying it to the Feisty
kernel. Obviously without the necessary hardware, I am relying on one
of the bug reporters to test the patch, perhaps independently, or once
(if) the patch appears in a released Feisty kernel.
To confirm this analysis, it would be useful for someone to unload the
tifm_sd driver (modprobe -r tifm_sd), and then to issue the setpci
command. If the sdhci driver is in use, the MMC card should still be
accessible.
** Changed in: linux-source-2.6.20 (Ubuntu)
Status: In Progress => Needs Info
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[feisty] regression: ti mmc card reader not working (worked flawlessly in edgy)
https://launchpad.net/bugs/82680
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