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authorMarek Vasut <marex@denx.de>2012-09-04 04:40:17 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-09-06 07:42:18 +0800
commit727c10e3e54c4404f6842d246b15fe3703d33556 (patch)
treef672db2d5614a0c14992b63d6d4c423789e2665a /drivers/spi
parent204e706fa2ac1a62ff6423039945eb567c6c7efc (diff)
downloadlinux-linaro-stable-727c10e3e54c4404f6842d246b15fe3703d33556.tar.gz
mxs/spi: Decrement the DMA/PIO border
This driver checks the length of transfer to be made and based on this information, either chooses to transfer data via DMA or PIO. Decrement this border further to gain better performace eg. during SPI flash writes. Empiric measurement shows that this gives extra 3kB/s write speed with a M25P80 flash clocked at 40MHz. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-mxs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c
index 138c8523dbba..21e1dcad3914 100644
--- a/drivers/spi/spi-mxs.c
+++ b/drivers/spi/spi-mxs.c
@@ -445,7 +445,7 @@ static int mxs_spi_transfer_one(struct spi_master *master,
* DMA only: 2.164808 seconds, 473.0KB/s
* Combined: 1.676276 seconds, 610.9KB/s
*/
- if (t->len <= 256) {
+ if (t->len < 32) {
writel(BM_SSP_CTRL1_DMA_ENABLE,
ssp->base + HW_SSP_CTRL1(ssp) +
STMP_OFFSET_REG_CLR);