Re: alsa-project alsa-ucm : Audio endpoint is not switching when external mic connected

[Takashi Iwai <tiwai@suse.de>]

On Wed, 03 Jun 2020 12:32:41 +0200,
Mukunda, Vijendar wrote:
> 
> 
> 
> > -----Original Message-----
> > From: Takashi Iwai <tiwai@suse.de>
> > Sent: Wednesday, June 3, 2020 3:05 PM
> > To: Hui Wang <hui.wang@canonical.com>
> > Cc: Jaroslav Kysela <perex@perex.cz>; Mukunda, Vijendar
> > <Vijendar.Mukunda@amd.com>; alsa-devel@alsa-project.org
> > Subject: Re: alsa-project alsa-ucm : Audio endpoint is not switching when
> > external mic connected
> > 
> > On Wed, 03 Jun 2020 02:36:25 +0200,
> > Hui Wang wrote:
> > >
> > >
> > > On 2020/6/3 上午3:39, Jaroslav Kysela wrote:
> > > > Dne 02. 06. 20 v 19:57 Mukunda, Vijendar napsal(a):
> > > >> We recently up streamed ACP PDM driver for Renoir APU.
> > > >>
> > > >> Our ACP IP has an internal PDM Decoder block where DMIC is directly
> > > >> connected.
> > > >> There are no KControls defined for PDM Driver.
> > > >>
> > > >> Our platform supports on board DMIC and South bridge Azalia (HD
> > > >> Audio ) endpoint .
> > > >> By default, DMIC endpoint is used as audio input device.
> > > >> When Headset Mic jack connected, it's not switching to External Mic.
> > > >
> > > > Make sure that the Headset Mic priority port in pulseaudio is is
> > > > greater than the one for DMIC.
> > > >
> > > >> How does audio endpoint will switch in gnome when external mic is
> > > >> connected?
> > > >>> From our understanding, UCM conf file for HDA driver is also
> > > >>> required for
> > > >> configuring mixer controls for HD Audio capture device.
> > > >> Similarly when External Mic is removed , it has to switch to
> > > >> internal dmic .
> > > >
> > > > An configuration example for UCM (DMIC connected to DSP, HDA codec
> > > > for rest):
> > > >
> > > >
> > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub
> > .com%2Falsa-project%2Falsa-ucm-conf%2Ftree%2Fmaster%2Fucm2%2Fsof-
> > hda-
> > dsp&amp;data=02%7C01%7CVijendar.Mukunda%40amd.com%7C5fbb3a516d5
> > 24c73568d08d807a157a1%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C
> > 0%7C637267736827671946&amp;sdata=0aO7dbLATuW%2BIeJsjWoWCGOaYEO
> > WQaVwI9izppB3v7k%3D&amp;reserved=0
> > > >
> > > > If you need a help to create a new configuration for your hardware,
> > > > show the output from the alsa-info.sh script, please.
> > > >
> > > >                     Jaroslav
> > >
> > > This audio design is  a bit different from sof-hda-dsp, the dmic is on
> > > a standalone sound card. Please see the alsa-info.txt:
> > >
> > >
> > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpasteb
> > in.ubuntu.com%2Fp%2F4kprhDZYbg%2F&amp;data=02%7C01%7CVijendar.Mu
> > kunda%40amd.com%7C5fbb3a516d524c73568d08d807a157a1%7C3dd8961fe4
> > 884e608e11a82d994e183d%7C0%7C0%7C637267736827671946&amp;sdata=Q
> > 50xNbF1KSqasNa0UyKzUFAzOc9KPIguBjgYHr1XSbg%3D&amp;reserved=0
> > 
> > And that's an interesting case.  Can we manage multiple cards in a
> > single UCM profile?
> > 
> > 
> > Takashi
> 
> I am not much familiar with UCM files creation.
> As per my understanding, UCM entries will program the mixer controls
> depending up on the use case and selected device.

UCM is more than that.  It manages which PCM device is chosen, which
jack control corresponds, etc, too.


Takashi