Question regarding HDMI Audio support on i.MX6 with vanilla kernel

[Luís Mendes]

I've checked the interrupts for 120000.hdmi and they do increment with
aplay without the sound server, as well as when the sound server is loaded
and I play audio files with mpv or vlc.
The sgtl5000 unit is playing audio on analog output fine, only the digital
outputs don't produce sound.
Still haven't checked what happens when unloading the kernel modules for
the other audio devices... I will have to compile the kernel with such
devices defined as modules, so that I can unload or blacklist them.

On Mon, Nov 6, 2017 at 2:44 PM, Russell King - ARM Linux <
linux at armlinux.org.uk> wrote:

> On Mon, Nov 06, 2017 at 02:32:19PM +0000, Luís Mendes wrote:
> > Thanks for the replies!
> >
> > Russell, the profile you sent me, did help, it was indeed missing. Now I
> > have Digital Stereo (HDMI) Output and Digital Stereo (IEC958) Output
> > besides the one I already had for this sound card (Analog Stereo Output).
> >
> > Unfortunately I still get no sound on HDMI, neither on IEC958 optical
> > output, although the laser led lit up when I set the output to IEC958,
> but
> > no sound on neither outputs.
> >
> > I have rechecked the kernel configuration of linux-4.14-rc5, but I don't
> > find anything wrong with it... I am testing with the Wandboard Quad Plus.
>
> I'd suggest as a first step getting rid of every other sound capable
> device apart from the dw-hdmi driver.
>
> Next, try playing an audio file with aplay:
>
> aplay -D front:CARD=DWHDMI,DEV=0 some.wav
>
> You may have to disable your sound daemon for that to work.
>
> Check /proc/interrupts, see whether the interrupt count for 120000.hdmi
> increases when you play an audio file.
>
> Then try via the sound daemon.
>
> Let me know how you get on.
>
> --
> RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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> up
> According to speedtest.net: 8.21Mbps down 510kbps up
>
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