Re: [alsa-devel] [PATCH v9 3/4] ASoC: tda998x: add a codec to the HDMI transmitter

On Fri, 09 Jan 2015 17:39:08 +0000 Andrew Jackson Andrew.Jackson@arm.com wrote:

...

•   snd_pcm_hw_constraint_minmax(runtime,
  

•                           SNDRV_PCM_HW_PARAM_CHANNELS,
  

•                           1, sad[SAD_MX_CHAN_I]);  
  

In the light of our discussions elsewhere [1], shouldn't this be constrained by the number of hardware channels that the TDA998x supports too? That is, the maximum number of channels should be the lesser of sd[SAD_MX_CHAN_I] and number_of_I2S channels (or S/PDIF channels if so configured).

snd_pcm_hw_constraint_minmax() does the job from the min/max numbers of channels in the DAI definition and the real max number of channels will be set from audio ports declared in the DT.