[alsa-devel] wm9713 problem

Hi! I've problem with ARM board with WM9713 codec. I have very simple test application, which reads samples with snd_pcm_readi and then writes them with snd_pcm_writei. I've tested this on few PC-s and it works fine. However on FirendlyARM tiny6410 it hangs after few seconds on call to snd_pcm_readi. What is more funny If I'm writing samples with 0 (silence), reading works fine. It hangs only if I'm writing non-silence. If I break program with Ctrl+C, I can see in dmesg:

s3c64xx_dma_stop: channel still active.

and audio driver is not working any more. I need to restart board to make it working.

What it can be ? Where to look for problem ? The kernel is 2.6.38 PREEMPT

best regards Jarek