Commit bdcf120b authored Nov 25, 2014 by Chris Wilson Committed by Daniel Vetter Dec 03, 2014

drm/i915: Assert that we successfully downclock the GPU before suspend



Before suspending, we wait upon the outstanding GPU requests and flush
our pending idle handlers. This should downclock the GPU to its lowest
power state. Add a WARN to check that the delayed tasks were run and did
their job properly.

Suggested-by: Akash Goel <akash.goel@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

parent 4feb7659

drivers/gpu/drm/i915/i915_gem.c

+5 −0

Original line number	Original line	Diff line number	Diff line
	@@ -4581,6 +4581,11 @@ i915_gem_suspend(struct drm_device *dev)
	cancel_delayed_work_sync(&dev_priv->mm.retire_work);		cancel_delayed_work_sync(&dev_priv->mm.retire_work);
	flush_delayed_work(&dev_priv->mm.idle_work);		flush_delayed_work(&dev_priv->mm.idle_work);

			/* Assert that we sucessfully flushed all the work and
			* reset the GPU back to its idle, low power state.
			*/
			WARN_ON(dev_priv->mm.busy);

	return 0;		return 0;

	err:		err: