From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Date: Mon, 7 Mar 2011 10:33:11 +0000 (+0100)
Subject: mmc: tmio: use PIO for short transfers
X-Git-Tag: v2.6.39-rc1~1^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f52c3552946eafa13f89c949449d16ce2b58b24;p=pandora-kernel.git

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>
---

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