Re: [alsa-devel] [RFC PATCH] ARM ASoC: add sound driver for imx27pdk using mc13783 codec

Le vendredi 8 juillet 2011 15:24:51, Jürgen Lambrecht a écrit :

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

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.

• 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

(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.

Thanks,

Philippe