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sdio: add quirk to clamp byte mode transfer 

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 <bzhao@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bing Zhao 2010-03-05 13:43:25 -08:00 committed by Linus Torvalds
parent 729adf1b5f
commit 3fb7fb4a01
2 changed files with 13 additions and 1 deletions
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7
drivers/mmc/core/sdio_io.c
View File

@ -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 */
}

7
include/linux/mmc/card.h
View File

@ -99,6 +99,8 @@ struct mmc_card {
#define MMC_STATE_BLOCKADDR (1<<3) /* card uses block-addressing */
unsigned int quirks; /* card quirks */
#define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes outside of the VS CCCR range */
#define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize */
/* for byte mode */
u32 raw_cid[4]; /* raw card CID */
u32 raw_csd[4]; /* raw card CSD */
@ -139,6 +141,11 @@ static inline int mmc_card_lenient_fn0(const struct mmc_card *c)
return c->quirks & MMC_QUIRK_LENIENT_FN0;
}
static inline int mmc_blksz_for_byte_mode(const struct mmc_card *c)
{
return c->quirks & MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
}
#define mmc_card_name(c) ((c)->cid.prod_name)
#define mmc_card_id(c) (dev_name(&(c)->dev))