Hi, Peter Ujfalusi wrote: > On Tuesday 04 August 2009 23:46:09 ext Janusz Krzysztofik wrote: > >> For both playback start while capturing and capture start while playing, >> XSYNC_ERR/RSYNC_ERR is clear >> and XRDY/RRDY is ready, > > This means that XRDY/RRDY is set (1)? Yes, trasmit/recieve confirmed at first while(!(readw(...) & XRDY/RRDY)) attempt. > In case of playback start while capture: What is the state of the XEMPTY bit > (SPCR2:2)? Is it 0? It should. Have not checked, but will do for completness. > I think the reason is quite simple: on OMAP1 the DMA request is edge sensitive > (compared to OMAP2 and OMAP3 where it is level based). This means: Good recap. > The danger with the pollwrite/pollread is: > If the stream is not mono, than you kind of ensure a certain channel shift > (channel switch in case of stereo stream). Good point, I was trying break all not mono. >> If my analysis is correct, the best solution I can see would be starting >> McBSP transfer for one direction only, not both, so the opposite direction >> can be started when needed. That requires deeper and wider OMAP knowledge >> and a change in omap_mcbsp_start() API though. I am not in a position to >> deal with this myself, I'm afraid. > > I agree, this would be the best solution for the problem. I was also considering omap_mcbsp_restart(id, direction) as a more conservative solution, but now, after Jarkko has subbmitted his patch on omap_mcbsp_start(), it's not an option any longer, I think. Cheers, Janusz _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
