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| author | Daniel Mack <daniel@caiaq.de> | 2010-04-01 10:03:25 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2010-04-14 09:18:07 +0200 |
| commit | 3fcb027d7fd749569665d34a79ce2a8e00bc2ed6 (patch) | |
| tree | 154b65062a5e2c0ff94c9463c8dfe7bfc905affd /include/linux/mmc | |
| parent | f441b993101d4ee95222ccbaad1e0dd53ea90b64 (diff) | |
| download | blackbird-op-linux-3fcb027d7fd749569665d34a79ce2a8e00bc2ed6.tar.gz blackbird-op-linux-3fcb027d7fd749569665d34a79ce2a8e00bc2ed6.zip | |
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 'include/linux/mmc')
| -rw-r--r-- | include/linux/mmc/host.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 43eaf5ca5848..3196c84cc630 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -108,6 +108,9 @@ struct mmc_host_ops { int (*get_cd)(struct mmc_host *host); void (*enable_sdio_irq)(struct mmc_host *host, int enable); + + /* optional callback for HC quirks */ + void (*init_card)(struct mmc_host *host, struct mmc_card *card); }; struct mmc_card; |
