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* [PATCH] drm/i915: Don't wake the device up to check if the engine is asleep
@ 2018-02-12  9:39 Chris Wilson
  2018-02-12 10:10 ` ✓ Fi.CI.BAT: success for " Patchwork
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Chris Wilson @ 2018-02-12  9:39 UTC (permalink / raw)
  To: intel-gfx; +Cc: Mika Kuoppala

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>
---
 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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^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2018-02-12 11:27 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-02-12  9:39 [PATCH] drm/i915: Don't wake the device up to check if the engine is asleep Chris Wilson
2018-02-12 10:10 ` ✓ Fi.CI.BAT: success for " Patchwork
2018-02-12 10:37 ` [PATCH] " Mika Kuoppala
2018-02-12 11:27 ` ✗ Fi.CI.IGT: failure for " Patchwork

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