Re: [alsa-devel] [PATCH 3/4] snd: add support for displayport multi-stream to hda codec.

From: David Weinehall <david.weinehall@linux.intel.com>
To: Raymond Yau <superquad.vortex2@gmail.com>
Cc: alsa-devel@alsa-project.org,
	"Takashi Iwai (tiwai@suse.de)" <tiwai@suse.de>,
	"intel-gfx@lists.freedesktop.org"
	<intel-gfx@lists.freedesktop.org>,
	"Girdwood, Liam R" <liam.r.girdwood@intel.com>,
	"Lu, Han" <han.lu@intel.com>
Subject: Re: [alsa-devel] [PATCH 3/4] snd: add support for displayport multi-stream to hda codec.
Date: Thu, 25 Jun 2015 15:52:42 +0300	[thread overview]
Message-ID: <20150625125241.GR14570@boom> (raw)
In-Reply-To: <CAN8cciYWwDQaMdWXb-Tw9F728jxwqrQLWiGY2B+LszrDvFrw+Q@mail.gmail.com>

On Thu, Jun 25, 2015 at 04:22:38PM +0800, Raymond Yau wrote:
> > >
> > > Shall we move or cc this discussion on audio driver side to ALSA ML?
> >
> > Oops I thought I had cc'ed these patches to alsa-devel as well when I
> sent them.
> >
> > > I think we also need to decide how to manage PCM devices for DP MST.
> > > Now the HD-A driver create a PCM device for each pin, and the substream
> > > number is 1 for each PCM. Now with DP MST enabled, each pin can support
> > > multiple streams (e.g. 3 on Intel HSW/BDW/SKL).
> 
> What hardware feature are available ?
> 
> Only three monitors playing different audio streams or
> 
> With 1x3 video wall , can the center monitor playback stereo while the left
> monitor play left channel and right monitor play right channel ?

Ohhh, clever idea :)  If it isn't support already it'd make an awesome
feature at least.

Kind regards, David
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