[Bug 98797] [BXT/KBL] - HDMI - HD audio passthrough dont work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98797

--- Comment #105 from Achilles <lqvnguyen at hotmail.com> ---
Again I am not a software developer. I have co-reviewed the drm code with a
colleague (retired kernel device driver developer). We see something odd in
line 429-433 of hsw_audio_codec_enable. 

https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/i915/intel_audio.c

What happens if there is an interrupt? Specifically, if interrupted before the
function returns, does initialization actually complete? Users complaints are
"no audio passthrough/bitstreaming". Is there a 1:1 relationship to the ELD
write address?

Apologies if we are way off base here.

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