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Commit 5cf20aa5 authored by Wolfgang Muees's avatar Wolfgang Muees Committed by Pierre Ossman
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mmc_spi: speedup for slow cards, less wear-out 



Speedup for slow cards by transfering more data at once.
This patch also reduces the amount of wear-out of the flash
blocks because fewer partial blocks are written.

Signed-off-by: default avatarWolfgang Muees <wolfgang.mues@auerswald.de>
Signed-off-by: default avatarPierre Ossman <pierre@ossman.eu>
parent 94d89efb

drivers/mmc/host/mmc_spi.c

+12 −0
Original line number Diff line number Diff line
@@ -97,6 +97,14 @@ 
 */

#define r1b_timeout		(HZ * 3)



/* One of the critical speed parameters is the amount of data which may

 * be transfered in one command. If this value is too low, the SD card

 * controller has to do multiple partial block writes (argggh!). With

 * today (2008) SD cards there is little speed gain if we transfer more

 * than 64 KBytes at a time. So use this value until there is any indication

 * that we should do more here.

 */

#define MMC_SPI_BLOCKSATONCE	128



/****************************************************************************/
@@ -1366,6 +1374,10 @@ static int mmc_spi_probe(struct spi_device *spi) 


	mmc->ops = &mmc_spi_ops;

	mmc->max_blk_size = MMC_SPI_BLOCKSIZE;

	mmc->max_hw_segs = MMC_SPI_BLOCKSATONCE;

	mmc->max_phys_segs = MMC_SPI_BLOCKSATONCE;

	mmc->max_req_size = MMC_SPI_BLOCKSATONCE * MMC_SPI_BLOCKSIZE;

	mmc->max_blk_count = MMC_SPI_BLOCKSATONCE;



	mmc->caps = MMC_CAP_SPI;