If the entire device is powered off, we can safely assume that the
engine is also asleep (and idle).
Reported-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
Fixes: a091d4ee931b ("drm/i915: Hold a wakeref for probing the ring registers")
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
Cc: Mika Kuoppala <mika.kuopp...@intel.com>
---
drivers/gpu/drm/i915/intel_engine_cs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
b/drivers/gpu/drm/i915/intel_engine_cs.c
index 0ad9184eba97..3efc589a7f37 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1464,7 +1464,9 @@ static bool ring_is_idle(struct intel_engine_cs *engine)
struct drm_i915_private *dev_priv = engine->i915;
bool idle = true;
- intel_runtime_pm_get(dev_priv);
+ /* If the whole device is asleep, the engine must be idle */
+ if (!intel_runtime_pm_get_if_in_use(dev_priv))
+ return true;
/* First check that no commands are left in the ring */
if ((I915_READ_HEAD(engine) & HEAD_ADDR) !=
--
2.16.1
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