[alsa-devel] Enabling HDMI HBR mode on Intel HDA

Anssi Hannula anssi.hannula at iki.fi
Fri Jul 30 14:48:41 CEST 2010

Hi all!

We have been trying to get truehd/mlp/mat passthrough to work, with no luck so 
far. As HDMI standard requires a separate transmission mode (i.e. HBR Audio 
Stream Packets instead of Audio Sample Packets) for high-bitrate (over 
6.144Mbps) compressed formats, a driver change is needed, AFAIU.

Attached is a hack we have been using with hda_intel driver (the patch is for 
generic code; we have been using nvidia 8x codec if that matters).

Could anyone familiar with Intel HDA confirm whether the hack looks correct, 
or if something more is required? (0x05 is the hardcoded pin nid).

It would help to know for sure that the problem is in our iso61937/mat 
encapsulation and not in the temporary driver hack.

Anssi Hannula
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