[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 #65 from Maik Freudenberg <hhfeuer at gmx.de> ---
I feel like I'm jumping from puddle to puddle now.
Lukas, I previously couldn't test your patches due to an acpica bug affecting
my machine rendering results useless. Luckily, this has been fixed now.

Meanwhile, I discovered that (at least) kernels 4.9-4.13 suffer from some pci
config space bug making re-reading the header type impossible. The kernel will
always put out a cached version thus making it impossible to enable the hda dev
with any method, even remove/rescan.
So a fair warning to users running a 4.9LTS kernel trying to turn on audio.
Kernel series 4.4 or 4.14+ work.

Now with the acpi bug fixed, I applied both of your v2 patchsets with some
nip/tuck to a 4.16rc4+ kernel and ran into the next oddity: while the pci quirk
in general works, re-reading the header type will always return 0x00 so the hda
device is not added.
lspci confirms that the quirk is otherwise working:
00: de 10 92 12 07 00 10 00 a1 00 02 03 00 00 80 00
480: 00 00 00 00 17 00 00 00 00 00 00 02 00 00 00 00

I'll investigate what's happening the next days.

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