Re: [PATCH] Sam440ep support

On Tue, 2008-05-06 at 11:16 +0200, Gerhard Pircher wrote:

I can't answer this question. *ducked* :-) Takashi?

FYI: I posted the results of the test with Takashi's dma_mmap_coherent
patch here:
http://ozlabs.org/pipermail/linuxppc-dev/2006-June/024078.html

On the other side it looks like this problem does not only affect
ALSA.
As far as I can tell also some V4L(2) drivers have a problem with
mmaping
non coherent DMA allocations, but I'm not sure (it's a long time since
I
did some tests with video cards on my AmigaOne).

Naturally I can do some tests, if you or Takashi come up with a new
patch.

Time that we sort that stuff out once for all..

sg allocations are usually lists of page, so virt_to_page shouldn't be a
problem in the first place, though we still need some way to get the
right prot attributes.

Ben.