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mmc: remove multiwrite capability

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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>
This commit is contained in:
Pierre Ossman 2008-07-06 01:10:27 +02:00
parent 97067d5581
commit 23af60398a
9 changed files with 29 additions and 43 deletions
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11
include/linux/mmc/host.h
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@ -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 */