From: Bing Zhao <bzhao@xxxxxxxxxxx>
Some SDIO cards expect byte transfers not to exceed the configured
block transfer size. Add a quirk to that effect.
Signed-off-by: Bing Zhao <bzhao@xxxxxxxxxxx>
Signed-off-by: Nicolas Pitre <nico@xxxxxxxxxxx>
---
Patches to make use of this quirk will be sent separately.
diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c
index f9aa8a7..f87ec97 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 2ee22e8..5330ad8 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))
--
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