[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 #77 from Daniel Drake <dan at reactivated.net> ---
Created attachment 144596
  --> https://bugs.freedesktop.org/attachment.cgi?id=144596&action=edit
Acer Predator G3-572 acpidump

Martin Lopatář, thanks for the analysis above, sorry I missed those details
before!

Checking on my Acer Predator G3-572 (acpidump attached here), I can see what
you're referring to in SSDT5:

        OperationRegion (PCNV, SystemMemory, \_SB.PCI0.PEG0.PEGP.EBAS, 0x1000)
        Field (PCNV, AnyAcc, NoLock, Preserve)
        {
            Offset (0x488), 
                ,   25, 
            MLTF,   1
        }

        Method (_PS0, 0, NotSerialized)  // _PS0: Power State 0
        {
            If (DGOS)
            {
                If ((\_SB.PCI0.PEG0.PEGP.DPCS != Zero))
                {
                    \_SB.PCI0.PEG0.PEGP._ON ()
                    DGOS = Zero
                }
            }
            ElseIf ((\_SB.PCI0.PEG0.DVID != 0xFFFF))
            {
                If ((GGIV (0x01080001) == Zero))
                {
                    MLTF = Zero
                }
                Else
                {
                    MLTF = One
                    \_SB.PCI0.PEG0.PEGP.NASV = \_SB.PCI0.PEG0.PEGP.DSSV
                }
            }
        }

MLTF presumably means multifunction and it's exactly the bit we've been working
with. But I haven't yet managed to get _PS0 to run this code. I get to the
GGIV(0x01080001) call, but it returns 0, so the bit doesn't get set.

I looked for some obvious connection to stuff in _DSM but I can't spot
anything. Can you clarify exactly what you saw that links _DSM and _PS0
together, and share your acpidump?

I tried understanding what GGIV() does but nothing is clear there. It ends up
reading bit 1 from physical memory address 0xfdac0408 which is under:
pci_bus 0000:00: resource 21 [mem 0xfd000000-0xfe7fffff window]
and I can't immediately spot any ACPI code that writes to that address.

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