[Intel-gfx] [PATCH v2 14/20] drm/i915: Make intel_display_suspend atomic, try 2.

[Maarten Lankhorst]

Op 07-07-15 om 11:48 schreef Daniel Vetter:
> On Tue, Jul 07, 2015 at 09:08:25AM +0200, Maarten Lankhorst wrote:
>> Calculate all state using a normal transition, but afterwards fudge
>> crtc->state->active back to its old value. This should still allow
>> state restore in setup_hw_state to work properly.
>>
>> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90396
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> What we could do here (just as an experiment really, I haven't thought
> through the implications for locking) is duplicate the state here _before_
> we suspend everything. Then on force_restore we just use the saved state
> from here for resuming. Would get rid of the failures on resume.
>
> Otoh we need that code for the lid notifier still, so probably meh.
>
Or make a intel_duplicate_state helper and then swap the sw state back.
I think that might be overkill and just patching up crtc_state->active afterwards
is fine. The restore on resume performs a full recheck anyway.

~Maarten