[MMC] MMC_CAP_BYTEBLOCK flag for non-log2 block sizes capable hosts

Some MMC hosts can only handle log2 block sizes.  Unfortunately,
the MMC password support needs to be able to send non-log2 block
sizes.  Provide a capability so that the MMC password support can
decide whether it should use this support or not.

The unfortunate side effect of this host limitation is that any
MMC card protected by a password which is not a log2 block size
can not be accessed on a host which only allows a log2 block size.

This change just adds the flag.  The MMC password support code
needs updating to use it (if and when it is finally submitted.)

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index b282ec9bba08..587264a58d56 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -86,6 +86,7 @@ struct mmc_host {
 
 #define MMC_CAP_4_BIT_DATA      (1 << 0)        /* Can the host do 4 bit transfers */
 #define MMC_CAP_MULTIWRITE      (1 << 1)        /* Can accurately report bytes sent to card on error */
+#define MMC_CAP_BYTEBLOCK       (1 << 2)        /* Can do non-log2 block sizes */
 
         /* host specific block data */
         unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */