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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>
This commit is contained in:
Chris Wilson 2014-11-25 11:56:33 +00:00 committed by Daniel Vetter
parent 4feb765943
commit bdcf120bfc
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/i915_gem.c
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@ -4581,6 +4581,11 @@ i915_gem_suspend(struct drm_device *dev)
cancel_delayed_work_sync(&dev_priv->mm.retire_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;
err: