linux-kernel - Re: omap4-droid4: voice call support was Re: [PATCHv5,5/5] ARM: dts: omap4-droid4: add soundcard

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Date:   Wed, 28 Mar 2018 11:36:41 +0200
From:   Pavel Machek <pavel@....cz>
To:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Lee Jones <lee.jones@...aro.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com
Subject: Re: omap4-droid4: voice call support was Re: [PATCHv5,5/5] ARM: dts:
 omap4-droid4: add soundcard

Hi!

> > > I can talk to the modem and start a call.
> > 
> > Doing an AT query is the easy part :)
> > 
> > > Then something like this (untested!) is certainly needed.
> > > Probably more...
> > 
> > I intentionally left this part out. The CPCAP codec has two DAIs
> > and not 3+. The code you just added is a hack from Motorola. Their
> > driver is full of hacks and it's obvious its author(s) did not
> > fully understand the ASoC APIs.
> > 
> > My understanding is, that we only need to replace the audio-graph-card
> > driver to something more complex. The VOICE DAI needs to be configured
> > differently based on the use case:
> 
> Does the voice part work for you? I configured all the mixers to
> voice, and then am using

I tried with 8kHz, 8-bit, too:

user@...uan:/my/tui/rweb$ arecord -D plughw:CARD=Audio,DEV=1 -t wav
--max-file-time 30 mon.wav
Recording WAVE 'mon.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
^CAborted by signal Interrupt...
arecord: pcm_read:2103: read error: Interrupted system call
user@...uan:/my/tui/rweb$ aplay -D plughw:CARD=Audio,DEV=1 -t wav
mon.wav
Playing WAVE 'mon.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
^CAborted by signal Interrupt...

Recording works okay, but playback produces ugly noise (not white this
time). If I copy mon.wav to PC, it playes back in pretty acceptable
quality.

So summary

HIFI DAI works
VOICE DAI recording is ok
VOICE DAI playbacks plays noise.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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