[Nouveau] [Bug 75985] [NVC1] HDMI audio device only visible after rescan

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75985

--- Comment #21 from Daniel Drake <dan at reactivated.net> ---
I checked the behaviour under Windows and it appears that Windows is doing the
above-mentioned PCI config space write when a HDMI cable is plugged in. I'm
fairly sure that this is done "natively" by the windows driver (not in ACPI
stuff). More info:
https://devtalk.nvidia.com/default/topic/1024022/linux/gtx-1060-no-audio-over-hdmi-only-hda-intel-detected-azalia/post/5227504/#5227504

What would be the best way to implement this in nouveau? I'm unsure about the
conditions we would want to do this under. Maybe something like:
 1. nouveau is driving the HDMI output using its own display controller, and
 2. HDMI cable is connected? (or maybe we enable HDMI audio all the time like
other platforms?)
 3. Only on GTX1060/GTX1070 which are the only cards where the 0x448 register
write has been confirmed to work?

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