tree 2e189714b2355996dba8974642460580077d3c0e
parent 09ca8adbe9f724a7e96f512c0039c4c4a1c5dcc0
author Philipp Zabel <philipp.zabel@gmail.com> 1215299734 +0200
committer Linus Torvalds <torvalds@linux-foundation.org> 1215365860 -0700

pxamci: fix byte aligned DMA transfers

The pxa27x DMA controller defaults to 64-bit alignment. This caused
the SCR reads to fail (and, depending on card type, error out) when
card->raw_scr was not aligned on a 8-byte boundary.

For performance reasons all scatter-gather addresses passed to
pxamci_request should be aligned on 8-byte boundaries, but if
this can't be guaranteed, byte aligned DMA transfers in the
have to be enabled in the controller to get correct behaviour.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>