From: Martin Fuzzey <mfuzzey@gmail.com>
Date: Thu, 30 Sep 2010 22:21:59 +0000 (+0200)
Subject: USB: imx21-hcd accept arbitary transfer buffer alignement.
X-Git-Tag: v2.6.37-rc1~154^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0cc3d4100e829d726d7c0fbf5b7b8d2146f60ba;p=pandora-kernel.git

USB: imx21-hcd accept arbitary transfer buffer alignement.

The hardware can only do DMA to 4 byte aligned addresses.
When this requirement is not met use PIO or a bounce buffer.

PIO is used when the buffer is small enough to directly
use the hardware data memory (2*maxpacket).

A bounce buffer is used for larger transfers.

Signed-off-by: Martin Fuzzey <mfuzzey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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