drm/i915: Don't update the render-clock for every bo.
Only update the render-clock on transition from busy to idle and vice versa, or else we burn a significant percentage of the cpu just rewriting the register -- not quite as power-friendly as intended ;-) Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Eric Anholt <eric@anholt.net>
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