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

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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>

...

This commit is contained in:

Jesse Barnes 2012-11-02 11:14:02 -07:00 • committed by Daniel Vetter

parent 4fc688ce79

commit 1abd02e2dd

2 changed files with 33 additions and 11 deletions

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1

drivers/gpu/drm/i915/i915_dma.c

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43

drivers/gpu/drm/i915/i915_drv.c

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