[Intel-gfx] [PATCH 3/3] drm/i915: don't rewrite the GTT on resume v2

[Chris Wilson]

On Tue, 30 Oct 2012 18:59:31 +0100, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Fri, Oct 26, 2012 at 10:08:38AM -0700, Jesse Barnes wrote:
> > The BIOS shouldn't be touching this memory across suspend/resume, so
> > just leave it alone.  This saves us ~50ms on resume on my T420.
> > 
> > v2: change gtt restore default on pre-gen4 (Chris)
> >     move needs_gtt_restore flag into dev_priv
> > 
> > Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> 
> I've just realized: GGTT PTEs are stored in stolen mem, and hence not
> restored accross S4.

How to ruin the day. So we may as just evict everything upon suspend and
rebuild as needed?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre