On 07/08/2011 04:11 PM, Philippe R?tornaz wrote:

Le vendredi 8 juillet 2011 15:24:51, J?rgen Lambrecht a ?crit :

quoted

- Started from sound/soc/imx/phycore-mc13783.c
- Renamed to general "imx" because also valid for imx27pdk (3ds) and 

other

quoted

3ds platforms. Or should there be a file per platform?

It's also valid on the mx31moboard platforms. So I guess it make sens 
to have
a general name.

ok

quoted

- Fixed some issues (add names, add read/write functions, changed
late_initcall to module_init, configure clock input pin) - Add debug
printing and comments.
- Result:
  * soundcard detection;
  * after creating /dev entries, aplay runs;
  * both 'aplay song.wav' and 'madplay song.mp3' give the same error:
    a time-out waiting for DMA (ALSA pcm_lib.c:1802: playback write 

error

quoted

(DMA or IRQ trouble?)) * this driver uses the DMA method; the FIQ method
gives the same error

Does it mean this doesn't work at all to play sound ? IIRC Sascha 
driver used
to work with the non-dmaengine implementation on 2.6.34.

indeed, doesn't work at all. I know it used to work on 2.6.34.
We also have a fsl linux 2.6.22 were it works.
I must say: when i use aplay to play a mono file, then there is no 
error, it just never ends, and no sound also.
For a stereo file, it gives the error.
Mark also that when I use madplay (v0.15.2) (or mp3play) to play a mono 
or stereo mp3, it allocates 3 DMA channels, but only frees one after the 
error.

J?rgen

Thanks,

Philippe

-- 
J?rgen Lambrecht
R&D Associate
Tel: +32 (0)51 303045    Fax: +32 (0)51 310670
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