From: Raymond Yau [mailto:superquad.vortex2@gmail.com] Sent: Friday, October 16, 2015 8:33 AM To: Takashi Iwai Cc: airlied@linux.ie; tanuk@iki.fi; David Henningsson; Yang, Libin;
Lin,
Mengdong; Girdwood, Liam R; ALSA Development Mailing List Subject: Re: [alsa-devel] DP1.2 MST audio support discussion
> > Do it mean that only one DP MST port and no HDMI port on
the
same graphic
> card ?
No.
If there is only one HDMI and one Display Port, this mean that
there
are two pin complexes How about the name of jack detection kctl of three Display Port monitors which are created on the same pin complex but
different
dev_index ?
For the jack name, what do you think if we change to "HDMI/DP, pin=n, dev=m" format? Will it impact on pulseaudio?
Yes, it will impact PulseAudio. It will require changes to files in
http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/
alsa/mixer/paths
So does this mean we should not change the name "HDMI/DP,pcm=3
Jack"
to "HDMI/DP,pin=n, dev=m Jack", otherwise the old PA will not work
with
the new driver?
Yes. And I don't understand why you need to do it, either - if you have three display port monitors on one pin, then they will all get different PCMs (8, 9 and 10), and they will signal their Jack status through "HDMI/DP,pcm=8 Jack", "HDMI/DP,pcm=9 Jack" and "HDMI/DP,pcm=10 Jack".
OK, I see. Thanks. I will not change the jack kctl name. BTW, the PCM number will be the same as converter, which means it will be 3 on Intel platforms.
Given that my proposed mapping algorithm will never change pin to PCM mapping (unless you have two displayport outputs and use MST on both), I think we can get away with not exposing the actual pin to userspace. And should this later become necessary, we can add a separate kctl for that.
My current thought is to expose the same jack kctls (same number and same name) to userspace while we will create hda_jack_tbl for each device entry. When pcm is bound to the device entry, the corresponding jack kctl will be bound to the device entry.
Regards, Libin
-- David Henningsson, Canonical Ltd. https://launchpad.net/~diwic _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel