[alsa-devel] [PATCH] ASOC: utils: Update dummy codec DAI settings to allow stream creation

Selma Bensaid selma.bensaid at intel.com
Fri Jun 8 10:02:38 CEST 2012

On 06/07/2012 11:30 PM, Mark Brown wrote:
> I still don't understand what this is actually supposed to fix - why are
> we trying to set up a stream to something that isn't there?  Though it
> looks like this was added for dynamic PCM which has no mainline users so
> perhaps there's a sensible use for this...
I'm trying to use the dummy codec for BT and Modem device where the 
coded is handled
@ AP side.
Without updating the dummy codec, I fails when opening my devices due to 
the check
performed in soc_pcm_open: No matching rates, No matching formats and No 
channels Errors.
> The other question is how we decide that these are sensible values to
> set for the dummy CODEC.
For formats the dummy codec support all formats so it does not impact 
the runtime->hw.formats = codec_dai_drv->playback.formats & 

For rates, I 'll submit a new version of the patch since the 
SNDRV_PCM_RATE_CONTINUOUS is not the right value to use.

For channels_min, the value 1 does not impact the 
runtime->hw.channels_min =  max(codec_dai_drv->capture.channels_min, 

For channels_max, I 'll submit a new version of the patch to set it to 
MAX so does not impact the runtime->hw.channels_max = 
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