[Cbe-oss-dev] Fw: PS3 sound driver / alsa problem with latest 2.6.28 kernel (2.6.28-09223-gc2fe70d)

[Stefan Wald]

nobody have an idea?
can spe activity disturb alsa? what can i do to isolate the problem?
any help is appreciated.
thanks,
Stefan
----- Forwarded by Stefan Wald/Germany/IBM on 01/26/2009 09:51 PM -----
                                                                                                                                                  
  From:       Stefan Wald/Germany/IBM                                                                                                             
                                                                                                                                                  
  To:         cbe-oss-dev at ozlabs.org                                                                                                              
                                                                                                                                                  
  Date:       01/13/2009 09:29 PM                                                                                                                 
                                                                                                                                                  
  Subject:    Re: PS3 sound driver / alsa problem with latest 2.6.28 kernel (2.6.28-09223-gc2fe70d)                                               
                                                                                                                                                  




Hi, forgot to mention that I'm getting these dmesgs:
snd_ps3_verify_dma_stop: DMA ch 0 is not
stopped.<6>snd_ps3_verify_dma_stop: DMA ch 0 is not stopped.
hopefully this rings a bell...
Thanks,
Stefan,

> cbe-oss-dev
>
> 01/12/2009 11:02 PM
>
> Hi,
> I experience an intermittend alsa sound lockup with the latest 2.6.
> 28 kernel on PS3. However, this problem has been around for a while
> ... probably since the very beginning ;-)
> I use ALSA in NONBLOCK mode and it generally works fine. But
> intermittendly it looks like alsa locks up (in most cases shortly
> after playback start).
> writei() then constantly returns -11 and snd_pcm_wait() never
> returns a 1 indicating that alsa is ready again to accept new frames.
> It's my impression that this lockup occurs more often in situations
> where there is high libspe activity with high memory utilization,
> but that's just a perception.
> My ALSA initialization is very similar to the one used in mplayer.
> I have played with the initialization: disabled underrun reporting,
> varied buffer sizes... but no change.
> Anything special I need to consider for PS3?
>
> Thanks,
> Stefan