diff options
| 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 /drivers/mmc/core | |
| parent | ARM: MXC: mxcmmc: Teach the driver SDIO operations (diff) | |
| download | linux-dev-3fcb027d7fd749569665d34a79ce2a8e00bc2ed6.tar.xz linux-dev-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 'drivers/mmc/core')
| -rw-r--r-- | drivers/mmc/core/sdio.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index 2dd4cfe7ca17..b9dee28ee7d0 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -296,6 +296,12 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, card->type = MMC_TYPE_SDIO; /* + * Call the optional HC's init_card function to handle quirks. + */ + if (host->ops->init_card) + host->ops->init_card(host, card); + + /* * For native busses: set card RCA and quit open drain mode. */ if (!powered_resume && !mmc_host_is_spi(host)) { |