APPLIED: [NATTY SRU Patch 0/1] mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency

[Tim Gardner]

On 07/25/2011 10:38 AM, Manoj Iyer wrote:
>
> Please consider the following SRU for Natty, it fixes Ricoh SD/MMC card
> reader which fails to read certain types of MMC/SD Cards. Please note that
> this patch should be applied on top of the patch to Ricoh mmc already SRUed
> for natty and maverick. http://patchwork.ozlabs.org/patch/98056/
>
> SRU JUSTIFICATION
> ================
>
> EFFECT
> ======
> Ricoh 1180:e823 does not recognize certain types of SD/MMC cards.
> - Buffalo SD 512MB
>    dmesg: I/O error, dev mmcblk0, sector xxx
> - Kingston SD 2GB
>    dmesg: I/O error, dev mmcblk0, sector xxx
> - Patriot Micro SDHC
>    dmesg: I/O error, dev mmcblk0, sector xxx.
>
> FIX
> ===
> Lowering the SD base clock frequency from 200Mhz to 50Mhz fixes
> this issue. This solution was suggest by Koji Matsumuro, Ricoh Company, Ltd.
>
> TEST
> ====
> Performance test results with various MMC and SD cards were posted
> to https://lkml.org/lkml/2011/7/11/381 and also part of the results
> attached to this bug.
>
>
> The following changes since commit 84aa86ba6a3f2331f1cfbab9b6def072ac1dee37:
>
>    mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency (2011-07-25 11:19:53 -0500)
>
> are available in the git repository at:
>     git://kernel.ubuntu.com/manjo/ubuntu-natty.git lp773524
>
>
>
>


-- 
Tim Gardner tim.gardner at canonical.com