[alsa-devel] DP1.2 MST audio support discussion

[Takashi Iwai]

On Mon, 02 Nov 2015 08:30:19 +0100,
Yang, Libin wrote:
> 
> 
> > -----Original Message-----
> > From: Takashi Iwai [mailto:tiwai at suse.de]
> > Sent: Friday, October 30, 2015 7:27 PM
> > To: Yang, Libin
> > Cc: Lin, Mengdong; David Henningsson; Raymond Yau; airlied at linux.ie;
> > tanuk at iki.fi; ALSA Development Mailing List; Girdwood, Liam R; Lu,
> > Han
> > Subject: Re: [alsa-devel] DP1.2 MST audio support discussion
> > 
> > On Tue, 27 Oct 2015 09:45:17 +0100,
> > Yang, Libin wrote:
> > >
> > > Hi Takashi and David,
> > >
> > > There are still some opens. Would you please help to comment?
> > >
> > > 1. SPDIF kctl.
> > > This SPDIF number will be the same as PCM and be bound to the PCM.
> > > The pin nid of SPDIF will not be initialized. And the pin nid will be
> > assigned
> > > After PCM is bound to the pin. (How to assign?)
> > 
> > I don't understand the question.  Could you elaborate?
> 
> In alsamixer for HDMI, we can see S/PDIF ctl to control 
> mute/unmute. Also in driver, we can see it creates the 
> ctls with snd_hda_create_dig_out_ctls() in build_controls() 
> based on pin number. I wonder whether user space use 
> these ctls based on pin or pcm? Suppose it should be also 
> based on PCM, right?

Right, these are for PCMs


Takashi