On Tue, 2007-10-16 at 16:27 +0800, Fengwei Yin wrote: > Hi all, > I met a problem about period_time/buffer_time on PXA with ASOC enabled. > The kernel version is 2.6.21. > > The Audio stream is 32k which is not supported by PXA ASOC driver. Please > refer following > RATES definition for PXA2xx. > > #define PXA2XX_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ > SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | > SNDRV_PCM_RATE_44100 | \ > SNDRV_PCM_RATE_48000) > This may be a bug in the pxa AC97 driver as most AC97 codecs can run at 32k and hence drive the AC97 link at 32k. I assume your using the WM9713 and this will request from the pxa AC97 controller when it needs PCM audio data in VRA mode. i.e. it will mark every 2 out of 3 AC97 frames (slot 3 & 4) as valid. Can you set SNDRV_PCM_RATE_32000 and give it a try, hopefully it should work and wont require any sample rate conversion. Liam _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
