diff options
author | Daniel Mack <daniel@caiaq.de> | 2010-04-01 04:03:25 -0400 |
---|---|---|
committer | Sascha Hauer <s.hauer@pengutronix.de> | 2010-04-14 03:18:07 -0400 |
commit | 3fcb027d7fd749569665d34a79ce2a8e00bc2ed6 (patch) | |
tree | 154b65062a5e2c0ff94c9463c8dfe7bfc905affd /drivers/char/hw_random | |
parent | f441b993101d4ee95222ccbaad1e0dd53ea90b64 (diff) |
ARM: MXC: mxcmmc: work around a bug in the SDHC busy line handling
MX3 SoCs have a silicon bug which corrupts CRC calculation of
multi-block transfers when connected SDIO peripheral doesn't drive the
BUSY line as required by the specs.
One way to prevent this is to only allow 1-bit transfers.
Another way is playing tricks with the DMA engine, but this isn't
mainline yet. So for now, we live with the performance drawback of 1-bit
transfers until a nicer solution is found.
This patch introduces a new host controller callback 'init_card' which
is for now only called from mmc_sdio_init_card().
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Volker Ernst <volker.ernst@txtr.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Michał Mirosław <mirqus@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/char/hw_random')
0 files changed, 0 insertions, 0 deletions