From 5cf20aa557e8f9dd5af302b8f33972082479753a Mon Sep 17 00:00:00 2001 From: Wolfgang Muees Date: Wed, 8 Apr 2009 10:14:07 +0100 Subject: 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: Wolfgang Muees Signed-off-by: Pierre Ossman --- drivers/mmc/host/mmc_spi.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c index f48349d18c92..a789db8eed28 100644 --- a/drivers/mmc/host/mmc_spi.c +++ b/drivers/mmc/host/mmc_spi.c @@ -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; -- cgit v1.2.3