tree 193ab366bf12a261235a2f8c0ae4c5ae182b941d
parent 51fc7b2ce74d31b7d9a6bd3c57bf6c1cc77e837d
author Guennadi Liakhovetski <g.liakhovetski@gmx.de> 1299493991 +0100
committer Chris Ball <cjb@laptop.org> 1301063945 -0400

mmc: tmio: use PIO for short transfers

This patch allows transferring of some requests in PIO and some in DMA
mode and defaults to using DMA only for transfers longer than 8 bytes.
This is especially useful with SDIO, which can have lots of 2- and 4-byte
transfers, creating unnecessary high overhead, when executed in DMA.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Chris Ball <cjb@laptop.org>