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

[Anatolij Gustschin]

On Mon, 7 Feb 2011 12:35:44 +0100 (CET)
Guennadi Liakhovetski <g.liakhovetski at gmx.de> wrote:

> 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.

Testing of 960x243 frames at 30 fps has been done during all my previous
tests. I didn't see any issues at 30 fps.

Anatolij