From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Fri, 2 Nov 2012 18:14:02 +0000 (-0700)
Subject: drm/i915: don't rewrite the GTT on resume v4
X-Git-Tag: v3.8-rc1~82^2~192^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1abd02e2dd7e0bd577000301fb2fd47780637387;p=pandora-kernel.git

drm/i915: don't rewrite the GTT on resume v4

The BIOS shouldn't be touching this memory across suspend/resume, so
just leave it alone.  This saves us ~6ms on resume on my T420 (retested
with write combined PTEs).

v2: change gtt restore default on pre-gen4 (Chris)
    move needs_gtt_restore flag into dev_priv
v3: make sure we restore GTT on resume from hibernate (Daniel)
    use opregion support as the cutoff for restore from resume (Chris)
v4: use a better check for opregion (Chris)

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Kill the needs_gtt_restore indirection and check directly for
OpRegion. Also explain in a comment what's going on.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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