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@xxxxxxxxx> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/i915_gem.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 4a1ca7abd7f9..e4fa0bc62c10 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -4669,6 +4669,11 @@ 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: -- 2.1.3 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
