[Intel-gfx] FBC patchset

[Chris Wilson]

On Tue, 17 Jan 2012 17:18:17 +0100, Daniel Vetter <daniel at ffwll.ch> wrote:
> I've just noticed that we seem to miss this plug to fix fbc issues. Care
> to resend a proper patch in case we still need this?
> 
> Also, I we could try to also disable fbc when we detect frontbuffer
> rendering (and generally abolish setting up the fence to detect such
> writes), maybe that helps with our fbc troubles (if it's actually worth
> it). Eugeni?

I'm testing whether disabling fbc when fb is busy helps on my
troublesome SNB. But X can and will still access the scanout through a
fence, so we can't simply abolish setting up fences here. The other
recourse is to always used a shadow buffer so that we never access the
scanout directly, and perhaps restrict that to only use render as well.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre