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>
diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c
index f9aa8a7..87c6189 100644
--- a/drivers/mmc/core/sdio_io.c
+++ b/drivers/mmc/core/sdio_io.c
@@ -189,7 +189,12 @@
{
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 */
}