[Bug 76151] [HSW-M GT3e bisected]Blackscreen after booting with HDMI only

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76151

--- Comment #6 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #5)
> Ugh, that interleaves the lifetime of the pm vs forcewake ref.
> 
> reg read: -> deferred forcewake.
> gen6_gt_get: -> pm_get, forcewake++
> gen6_gt_put: -> --forcewake, pm_put
> 
> device is now asleep
> 
> forcewake_timer: boom, invalid reg access.

You can only do reg I/O if you already have a runtime pm reference. But yeah
I've missed that we don't actually call the full machinery on suspend ...

Both approaches have the ugly issue though that the del_timer_sync will leak
the forcewake reference. So I think we need to call the timer function if we've
actually deactivated it ... fun stuff.

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