[PATCH 4/4] drm/i915: Cleanup instdone state when idle

[Ben Widawsky <ben@bwidawsk.net>]

The previous state is bogus when we've gone into idle. Actually there
would be a known state of idle (ie. all units are done), but since it
differs for every platform, we can just set 0, and let the hangcheck
progress as normal.

References: https://bugs.freedesktop.org/show_bug.cgi?id=52429
Tested-by: Guang A Yang <guang.a.yang@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 31054fa..5f116a1 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3624,6 +3624,9 @@ i915_gem_idle(struct drm_device *dev)
 	/* Cancel the retire work handler, which should be idle now. */
 	cancel_delayed_work_sync(&dev_priv->mm.retire_work);
 
+	dev_priv->last_instdone = 0;
+	dev_priv->last_instdone1 = 0;
+
 	return 0;
 }
 
-- 
1.7.11.4