[Intel-gfx] [CI] Revert "drm/i915/fbc: Allow on unfenced surfaces, for recent gen"

[Daniel Vetter]

On Wed, Aug 24, 2016 at 10:48:13PM +0100, chris at chris-wilson.co.uk wrote:
> On Wed, Aug 24, 2016 at 09:14:59PM +0000, Zanoni, Paulo R wrote:
> > Em Qua, 2016-08-24 às 19:00 +0100, Chris Wilson escreveu:
> > > . In the meantime lets hope that all
> > > framebuffers are idle and naturally fit within the mappable aperture.
> > 
> > What exactly do you mean with the sentence above? Is there some other
> > bug you spotted? Please share the information.
> 
> Not all framebuffers will be fenced, especially if they are being
> rendered to before being flipped to the first time. The pressure is less
> for full-ppgtt systems (now that we have independent activity tracking
> on the vma) but that is not sufficient to guarrantee the object will be
> assigned a map_and_fenceable VMA for display.

Yeah, with unmappable scanout fbc might luck out a lot.

Anyway, need to get the w/a and testing in place, on this revert
meanwhile:

Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch