Re: [PATCH v4 0/5] ALSA: hda - hdmi support dynamic pcm assignment

[Takashi Iwai <tiwai@suse.de>]

On Fri, 18 Dec 2015 03:53:32 +0100,
Yang, Libin wrote:
> 
> Hi Takashi,
> 
> > -----Original Message-----
> > From: Takashi Iwai [mailto:tiwai@suse.de]
> > Sent: Wednesday, December 16, 2015 3:47 PM
> > To: libin.yang@linux.intel.com
> > Cc: alsa-devel@alsa-project.org; Lin, Mengdong; Yang, Libin
> > Subject: Re: [alsa-devel] [PATCH v4 0/5] ALSA: hda - hdmi support
> > dynamic pcm assignment
> > 
> > On Wed, 16 Dec 2015 06:42:40 +0100,
> > libin.yang@linux.intel.com wrote:
> > >
> > > From: Libin Yang <libin.yang@linux.intel.com>
> > >
> > > The patches are trying to support dynamically binding PCM to pin
> > > in HDMI/DP audio.
> > >
> > > The pin will not bind to any PCM if there is not monitor connected.
> > > When there is a monitor connected to the port (pin), driver will
> > > try to find a proper PCM to assign to the port and setup the pin
> > > if necessary.
> > >
> > > Libin Yang (5):
> > >   ALSA: hda - hdmi begin to support dynamic PCM assignment
> > >   ALSA: hda - hdmi playback without monitor in dynamic pcm bind
> > mode
> > >   ALSA: hda - hdmi operate spdif based on pcm
> > >   ALSA: hda - hdmi dynamically bind PCM to pin when monitor hotplug
> > >   ALSA: hda - hdmi setup pin when monitor hotplug in pcm dynamic
> > >     assignment mode
> > 
> > I updated topic/hda-mst branch with these patches.  But the patch 4
> > needs more fixes, as suggested in another mail.
> > 
> > Overall, I'd like to know whether MST audio really works in the
> > current state, or not.  Do you have *any* git branch where MST audio
> > is supposed to work at all?
> 
> I have uploaded the patches to: https://github.com/libinyang/linux.git
> Branch is mst_virtual_pin_github. 
> 
> There is still an issue when doing the mst audio playback:
> The later converter selection for pin will overwrite the previous setting.
> This is the driver bug, I'm debugging it. 

Thanks.  I tried this branch, but the DP MST audio on my HP laptop
dock doesn't seem working.  It gets no notification (maybe expected),
but the accesses to any HDMI devices result in the error.  I tested
via aplay -Dhdmi:0,0 to 0,2.

With the latest patchset (e.g. my test/hdmi-jack branch) I get the
notification and ELD, but the audio still doesn't come out.  So,
something seems missing.


Takashi