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>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c630d4986376..fa3f907ce229 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -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: