[Nouveau] [Bug 60680] [NV96] HDMI is connected and has mode, TV says "no signal"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=60680

--- Comment #19 from Ilia Mirkin <imirkin at alum.mit.edu> ---
... and if that doesn't work, try making it a rd32 & 0xff instead of a rd08.
[would also need more logic to handle non-aligned-to-4 reads, but you don't
have those]

Looking at the full mmiotrace (rather than just PDISPLAY as my earlier diff was
doing), there are sections like

[0] 35.111642 MMIO32 R 0x619494 0x000900e8 PDISPLAY.VGA.CR+0x94 => 0x900e8
[0] 35.111688 MMIO32 W 0x619494 0x000900e0 PDISPLAY.VGA.CR+0x94 <= 0x900e0
... ~30 more identical lines ...

and then in the good trace:
[0] 35.113651 MMIO32 R 0x619494 0x000900e0 PDISPLAY.VGA.CR+0x94 => 0x900e0

but in the bad trace:
[0] 39.098615 MMIO8 W 0x6013d4 0x00000094 PRMIO.CRX <= 0x94
[0] 39.098655 CRTC0 R     0x94       0x00 0x94 => 0

And that is the value used by the condition 0x05. So it seems really likely
that this will help. I hope.

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