mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency
authorManoj Iyer <manoj.iyer@canonical.com>
Mon, 11 Jul 2011 21:28:35 +0000 (16:28 -0500)
committerChris Ball <cjb@laptop.org>
Thu, 21 Jul 2011 14:35:04 +0000 (10:35 -0400)
commit15bed0f2fa8e1d7db201692532c210a7823d2d21
tree6dbfff9a19ed69fac94e5a76f6df10ba13f41d93
parent770d7432009c8bc89cf72d47313866adf600c66a
mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency

Ricoh 1180:e823 does not recognize certain types of SD/MMC cards,
as reported at http://launchpad.net/bugs/773524.  Lowering the SD
base clock frequency from 200Mhz to 50Mhz fixes this issue. This
solution was suggest by Koji Matsumuro, Ricoh Company, Ltd.

This change has no negative performance effect on standard SD
cards, though it's quite possible that there will be one on
UHS-1 cards.

Signed-off-by: Manoj Iyer <manoj.iyer@canonical.com>
Tested-by: Daniel Manrique <daniel.manrique@canonical.com>
Cc: Koji Matsumuro <matsumur@nts.ricoh.co.jp>
Cc: <stable@kernel.org>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
drivers/pci/quirks.c