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sdio: add quirk to clamp byte mode transfer

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Some SDIO cards expect byte transfers not to exceed the configured block
transfer size.  Add a quirk to that effect.

Patches to make use of this quirk will be sent separately.

Signed-off-by: Bing Zhao <[email protected]>
Signed-off-by: Nicolas Pitre <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Bing Zhao 2010-03-05 13:43:25 -08:00 • committed by Linus Torvalds
commit 3fb7fb4a01
2 changed files with 13 additions and 1 deletions
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7
drivers/mmc/core/sdio_io.c
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@ -189,7 +189,12 @@ static inline unsigned int sdio_max_byte_size(struct sdio_func *func)
{
unsigned mval = min(func->card->host->max_seg_size,
func->card->host->max_blk_size);
mval = min(mval, func->max_blksize);
if (mmc_blksz_for_byte_mode(func->card))
mval = min(mval, func->cur_blksize);
else
mval = min(mval, func->max_blksize);
return min(mval, 512u); /* maximum size for byte mode */
}