| Message ID | 1311611909-4230-1-git-send-email-manoj.iyer@canonical.com |
|---|---|
| State | New |
| Headers | show |
Sorry missing BugLink: http://launchpad.net/bugs/773524 Thanks. On Mon, 25 Jul 2011, 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 > > > > > -- > kernel-team mailing list > kernel-team@lists.ubuntu.com > https://lists.ubuntu.com/mailman/listinfo/kernel-team > > -- ==================== Manoj Iyer Ubuntu/Canonical Hardware Enablement ====================
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 > > > >