diff options
| author | Bing Zhao <bzhao@marvell.com> | 2010-03-05 13:43:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-06 11:26:36 -0800 |
| commit | 3fb7fb4a01d09f81d1daaf65e52d929734bd691f (patch) | |
| tree | 8feac2d211f833fc1ef287aba3b138886454f45c | |
| parent | 729adf1b5f4562f67fe8bf6c1df97edc1128fac7 (diff) | |
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>
| -rw-r--r-- | drivers/mmc/core/sdio_io.c | 7 | ||||
| -rw-r--r-- | include/linux/mmc/card.h | 7 |
2 files changed, 13 insertions, 1 deletions
diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c index f9aa8a7deff..87c618904ee 100644 --- a/drivers/mmc/core/sdio_io.c +++ b/drivers/mmc/core/sdio_io.c @@ -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 */ } diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 2ee22e8af11..d02d2c6e0cf 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -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)) |