]> git.baikalelectronics.ru Git - kernel.git/commit
spi: imx: adjust watermark level according to transfer length
authorJiada Wang <jiada_wang@mentor.com>
Fri, 6 Jan 2017 12:22:18 +0000 (04:22 -0800)
committerMark Brown <broonie@kernel.org>
Fri, 6 Jan 2017 18:09:22 +0000 (18:09 +0000)
commitc7d9f155f7559745b15d514f3c3702a70e0b77c5
tree88df0f0674456138bfc9842585e371ee8b82fe82
parent61e97e732ac8f4496397abff47ad11acd8290ca8
spi: imx: adjust watermark level according to transfer length

Previously DMA watermark level is configured to fifosize/2,
DMA mode can be used only when transfer length can be divided
by 'watermark level * bpw', which makes DMA mode not pratical.

This patch adjusts watermark level to largest number (no bigger
than fifosize/2) which can divide 'tranfer length / bpw' for
each transfer.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/spi/spi-imx.c