drm/i915: Don't wake the device up to check if the engine is asleep

If the entire device is powered off, we can safely assume that the
engine is also asleep (and idle).

Reported-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: a091d4ee931b ("drm/i915: Hold a wakeref for probing the ring registers")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180212093928.6005-1-chris@chris-wilson.co.uk
(cherry picked from commit 74d00d28a15c8452f65de0a9477b52d95639cc63)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index d790bdc227ffb562fa58f50023e264d2bd8b5c38..acc661aa9c0c41c85e550ef02f71e9e4703018e4 100644 (file)
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1458,7 +1458,9 @@ 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) !=