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T4: HDMI Codec and Multichannel

Posted: Wed Dec 04, 2019 10:13 pm
by cu6apum
Hi there.

Whatever I do, the HDMI-CODEC audio device in ALSA is showing ONLY as stereo. As I can understand the TRM, the HDMI is attached to I2S2 (ff8a0000), which must be multichannel.
Trying to understand the kernel driver, I found out that channels_max is proper 8, not 2.
Where's the problem? There's no default asound.conf in the distro, so ALSA must find out the number of channels automatically, however plugging a receiver to the T4 results only in "failed to get edid" (as there is no TV attached) and "asoc-simple-card hdmi-codec: i2s-hifi <-> ff8a0000.i2s mapping ok". The receiver shows only Left and Right channels, too...

What am I doing wrong? I need all 8 channels through HDMI.

Re: T4: HDMI Codec and Multichannel

Posted: Sat Dec 28, 2019 3:04 pm
by cu6apum
I'll poke the topic.
Having fixed the dts, I could say "aplay -c 8", and /proc/asound/card2 does show channels: 8 on playback.
But the HDMI device does NOT recognize 8 streams in any way.

Am i stupid, or is there any additional wiring config for sending 8-channel audio to hdmi?!

Thank you.