[alsa-devel] [RFC 7/7] ASoC: ep93xx-pcm: Use dmaengine PCM helper functions

Lars-Peter Clausen lars at metafoo.de
Mon Feb 27 09:51:57 CET 2012

On 02/27/2012 09:19 AM, Mika Westerberg wrote:
> On Wed, Feb 22, 2012 at 10:49:11AM +0100, Lars-Peter Clausen wrote:
>> Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
> For some reason, this doesn't work on my ep93xx based Sim.One board. On
> playback with mpg123 when I press stop, it continues to play whatever was on
> the ring-buffer forever. Without the patches it works fine.
> I'll try to find some time to debug this further.

Hm, that’s interesting. The original ep93xx pcm driver was almost identical
to what the common helper functions do. The only difference I can spot right
now is, that it doesn't call dma_issue_pending after submitting the
descriptor. Could you try to comment out the dma_issue_pending in
soc-dmaengine-pcm.c and test whether it makes a difference?

- Lars

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