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| author | Philipp Zabel <philipp.zabel@gmail.com> | 2008-07-06 01:15:34 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-07-24 09:14:10 -0700 |
| commit | 708cc88d265a25f51dec199caa89aaee60967b3b (patch) | |
| tree | 1c26cb5f1c07564d128fd31715623c4add9993a4 /include | |
| parent | 0a96934becd9759b4dbf247226557c22abd12824 (diff) | |
pxamci: fix byte aligned DMA transfers
commit 97f8571e663c808ad2d01a396627235167291556 upstream
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions