[alsa-devel] [PATCH v3 4/7] ASoC: intel - add Skylake HDA platform driver

[Takashi Iwai]

At Thu, 30 Apr 2015 15:12:21 +0530,
Vinod Koul wrote:
> 
> On Wed, Apr 29, 2015 at 02:31:02PM +0200, Takashi Iwai wrote:
> > At Wed, 29 Apr 2015 01:24:27 +0530,
> > Vinod Koul wrote:
> > > 
> > > +static struct snd_soc_dai_driver soc_hda_platform_dai[] = {
> > > +{
> > > +	.name = "System Pin",
> > > +	.ops = &hda_pcm_dai_ops,
> > > +	.playback = {
> > > +		.stream_name = "System Playback",
> > > +		.channels_min = HDA_MONO,
> > > +		.channels_max = HDA_STEREO,
> > > +		.rates = SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_8000,
> > > +		.formats = SNDRV_PCM_FMTBIT_S16_LE,
> > > +	},
> > > +	.capture = {
> > > +		.stream_name = "System Capture",
> > > +		.channels_min = HDA_MONO,
> > > +		.channels_max = HDA_STEREO,
> > > +		.rates = SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_16000,
> > > +		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
> > 
> > Is it really S24_LE?  It's packed in lower 3 bytes of 4 bytes format.
> Yup, we do use S24_LE, thats very common on our DSP based systems

OK.

> > > +	},
> > > +},
> > > +{
> > > +	.name = "Deepbuffer Pin",
> > > +	.ops = &hda_pcm_dai_ops,
> > > +	.playback = {
> > > +		.stream_name = "Deepbuffer Playback",
> > > +		.channels_min = HDA_STEREO,
> > > +		.channels_max = HDA_STEREO,
> > > +		.rates = SNDRV_PCM_RATE_48000,
> > > +		.formats = SNDRV_PCM_FMTBIT_S16_LE,
> > > +	},
> > > +},
> > > +{
> > > +	.name = "LowLatency Pin",
> > > +	.ops = &hda_pcm_dai_ops,
> > > +	.playback = {
> > > +		.stream_name = "Low Latency Playback",
> > > +		.channels_min = HDA_STEREO,
> > > +		.channels_max = HDA_STEREO,
> > > +		.rates = SNDRV_PCM_RATE_48000,
> > > +		.formats = SNDRV_PCM_FMTBIT_S16_LE,
> > > +	},
> > 
> > Are there no S32_LE support at all for all dais?
> No, just 16 and 24 bits :)

Hm, so this restriction remains also for decoupled from DSP?

All HDA codecs supports 24bit formats (in S32_LE form), but in your
patch, 24bit format is supported only for System Capture.


Takashi