[PATCH 0/6] staging: BCM2835 MMAL V4L2 camera driver

[Michael Zoran]

On Mon, 2017-03-20 at 11:58 -0300, Mauro Carvalho Chehab wrote:
> Em Mon, 20 Mar 2017 04:08:21 -0700
> Michael Zoran <mzoran at crowfest.net> escreveu:
> 
> > On Mon, 2017-03-20 at 07:58 -0300, Mauro Carvalho Chehab wrote:
> > > Em Sun, 19 Mar 2017 22:11:07 -0300
> > > Mauro Carvalho Chehab <mchehab at s-opensource.com> escreveu:
> > >   
> > > > Em Sun, 19 Mar 2017 10:04:28 -0700
> > > > Michael Zoran <mzoran at crowfest.net> escreveu:
> > > >   
> > > > > A working DT that I tried this morning with the current
> > > > > firmware
> > > > > is
> > > > > posted here:
> > > > > http://lists.infradead.org/pipermail/linux-rpi-kernel/2017-Ma
> > > > > rch/
> > > > > 005924
> > > > > .html
> > > > > 
> > > > > It even works with minecraft_pi!    
> > > 
> > >   
> > 
> > Hi, can you e-mail out your config.txt?  Do you have audio enabled
> > in
> > config.txt?
> 
> yes, I have this:
> 
> $ cat config.txt |grep -i audio
> # uncomment to force a HDMI mode rather than DVI. This can make audio
> work in
> # Enable audio (loads snd_bcm2835)
> dtparam=audio=on
> 
> Full config attached.
> 
> Thanks,
> Mauro
> 

Are you using Eric Anholt's HDMI Audio driver that's included in VC4? 
That could well be incompatible with the firmware driver. Or are you
using a half mode of VC4 for audio and VCHIQ for video?