Hi
>
> On Fri, Mar 01, 2019 at 06:55:25AM +0000, S.j. Wang wrote:
>
> > > Alternatively, I feel instead of error-out at here, should we add a
> > > HW constraint or at least fence it off at the beginning of the
> > > hw_params()? This is actually nothing specific to the pair-request
> > > function but a hardware constraint.
> >
> > How about add constraint in startup?
> > static int fsl_asrc_dai_startup(struct snd_pcm_substream *substream,
> > struct snd_soc_dai *dai) {
> > struct fsl_asrc *asrc_priv = snd_soc_dai_get_drvdata(dai);
> >
> > if (asrc_priv->channel_bits == 3) {
> > snd_pcm_hw_constraint_step(substream->runtime, 0,
> > SNDRV_PCM_HW_PARAM_CHANNELS, 2);
> > }
> >
> > return 0;
> > }
>
> Yea, that looks good to me. Better to have a line of comments to tell that
> "bits==3" means older version -- maybe we should have something much
> more clear than using channel_bits but it is fine for now since they only
> differ here.
Ok , will send v2.
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