[PATCH 2/2 v2] dma: ipu_idmac: do not lose valid received data in the irq handler

[Guennadi Liakhovetski]

On Mon, 7 Feb 2011, Anatolij Gustschin wrote:

> On Mon, 7 Feb 2011 12:09:15 +0100 (CET)
> Guennadi Liakhovetski <g.liakhovetski at gmx.de> wrote:
> ...
> > > I can't try mplayer since I don't have mplayer setup for this.
> > > But looking at the mplayer source I don't see why it should
> > > behave differently. Depending on mode mplayer queues 2 or 6
> > > buffers. Testing with my test app with 6 queued buffers shows
> > > no issues, here the buffer numbers toggle correctly, too.
> > 
> > Ok, I've done a couple more tests. With larger frames, and, therefore 
> > lower fps - yes, with your patch buffers toggle correctly. Whereas in my 
> > tests with smaller frames and higher fps either only one buffer is used, 
> > or one is used much more often, than the other, e.g., 0 0 0 1 0 0 0 1 0... 
> > Could you try to verify? Without your patch with any fps buffers toggle 
> > consistently.
> 
> How small are the frames in you test? What is the highest fps value in
> your test?

QVGA, don't know fps exactly, pretty high, between 20 and 60fps, I think. 
Just try different frams sizes, go down to 64x48 or something.

Thanks
Guennadi
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Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/