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Date:   Sun, 1 Apr 2018 10:30:12 -0700
From:   Tony Lindgren <tony@atomide.com>
To:     Pavel Machek <pavel@ucw.cz>
Cc:     Sebastian Reichel <sebastian.reichel@collabora.co.uk>,
        Mark Brown <broonie@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Lee Jones <lee.jones@linaro.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>, alsa-devel@alsa-project.org,
        linux-omap@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, kernel@collabora.com,
        Dan Williams <dcbw@redhat.com>
Subject: Re: call/normal switch was Re: omap4-droid4: voice call support was
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* Tony Lindgren <tony@atomide.com> [180401 15:38]:
> * Pavel Machek <pavel@ucw.cz> [180401 13:20]:
> > On Sat 2018-03-31 16:43:14, Tony Lindgren wrote:
> > > * Pavel Machek <pavel@ucw.cz> [180331 19:56]:
> > > > On Sat 2018-03-31 21:46:16, Pavel Machek wrote:
> > > > > On Sat 2018-03-31 21:19:39, Pavel Machek wrote:
> > > > > > On Sat 2018-03-31 11:19:35, Tony Lindgren wrote:
> > > > > > > Cool :) Microphone still does not work for me.. I tried tweaking
> > > > > > > the alsamixer settings but no mic. This is with cold boot with
> > > > > > > droid4-kexecboot if that might make a difference, we may have
> > > > > > > some register uninitialized somewhere. Any ideas?
> > > > > > 
> > > > > > Ok, I was focusing on the speaker side.
> > > > > > 
> > > > > > alsamixer, tab to go to capture settings, set it to 37 37 Mic2 Mic1
> > > > > > should work, according to my notes, but not recently tested and not
> > > > > > tested against real human.
> > > > > > 
> > > > > > I'll attempt to test it, but something in my userland shuts down
> > > > > > system just after boot 60% of time, which is rather annoying.
> > > > > 
> > > > > Hmm. So I tried again, and setting Mic1 and back in the capture
> > > > > settings crashed the modem. Bang, disconnected from the USB.
> > > > 
> > > > Next try, and it worked this time.
> > > > 
> > > > _Before the call_, set mode to Normal and then Call. Then go to
> > > > capture, and set 100 100 Mic2 Mic1. Then place a call,
> > > > 
> > > > AT+CFUN=1
> > > > OK
> > > > ATD6;
> > > 
> > > No luck with microphone here :( Using ttyUSB4, AT+CFUN=1
> > > works, but ATD command on it just hangs the USB interface
> > > and I have to reload phy-mapphone-mdm6600 to reset the
> > > modem.
> > 
> > Test call with real human worked (thanks to Rolf K.), I could hear him
> > well but he reported call was very quiet. And that was with capture
> > settings at 100%.
> 
> Maybe the volume also needs to be controlled at mdm6600 end.
> I'm seeing some AT+CLVL=n with n being between [0-7] calls on
> DLCI2 in my Android logcat logs.
> 
> > If you had a register dump from android with mics working, preferably
> > not in speaker mode, perhaps I could try to figure it out?
> 
> OK here are four diffs against starting the phone app for regular
> call, speaker call, and muted versions of them:
> 
> http://muru.com/linux/d4/cpcap/
> 
> Also, I'm connected over cdma right now, not 3g, but I doubt
> that makes a difference for the microphone.

Found it! Here's what I need to do over n_gsm:

ngsm 1 "AT+CFUN=1"
ngsm 1 "AT+CFUN?"
ngsm 2 "AT+EACC=3,0"    # enable mic
ngsm 2 "AT+CLVL=4"      # set speaker volume
ngsm 2 "AT+CMUT=0"      # unmute mic
ngsm 1 "ATD${number}"
ngsm 1 "AT+CLCC"	# list current calls
ngsm 2 "AT+NREC=1"	# enable noise cancellation
ngsm 1 "AT+SCRN=0"	# ??? not sure if this does anything

while [ 1 ]; do
	date
	ngsm 1 "AT+CLCC"
	sleep 10
done

So speaker phone call works just fine, I just tested with a
human at the other end :)

Hmm let's hope all those also translate to some qmi calls.

Regards,

Tony