[Bug 76151] [HSW-M GT3e bisected]Blackscreen after booting with HDMI only
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Mar 14 01:23:38 PDT 2014
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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