mmc: remove multiwrite capability

Relax requirements on host controllers and only require that they do not
report a transfer count than is larger than the actual one (i.e. a lower
value is okay). This is how many other parts of the kernel behaves so
upper layers should already be prepared to handle that scenario. This
gives us a performance boost on MMC cards.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 5 insertions, 6 deletions

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 753b7231b887..10a2080086ca 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -111,12 +111,11 @@ struct mmc_host {
         unsigned long           caps;           /* Host capabilities */
 
 #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_MMC_HIGHSPEED   (1 << 2)        /* Can do MMC high-speed timing */
-#define MMC_CAP_SD_HIGHSPEED    (1 << 3)        /* Can do SD high-speed timing */
-#define MMC_CAP_SDIO_IRQ        (1 << 4)        /* Can signal pending SDIO IRQs */
-#define MMC_CAP_SPI             (1 << 5)        /* Talks only SPI protocols */
-#define MMC_CAP_NEEDS_POLL      (1 << 6)        /* Needs polling for card-detection */
+#define MMC_CAP_MMC_HIGHSPEED   (1 << 1)        /* Can do MMC high-speed timing */
+#define MMC_CAP_SD_HIGHSPEED    (1 << 2)        /* Can do SD high-speed timing */
+#define MMC_CAP_SDIO_IRQ        (1 << 3)        /* Can signal pending SDIO IRQs */
+#define MMC_CAP_SPI             (1 << 4)        /* Talks only SPI protocols */
+#define MMC_CAP_NEEDS_POLL      (1 << 5)        /* Needs polling for card-detection */
 
         /* host specific block data */
         unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */