[Intel-gfx] [PATCH 1/3] drm/i915/display: Do not schedule DRRS work thread when it is not active

[José Roberto de Souza]

Frontbuffer updates were scheduling the execution of DRRS work thread
even if DRRS is not active.
There was no issues with it because intel_drrs_downclock_work() checks
if DRRS is active but there is no reason to keep scheduling this work
thread and wasting CPU time.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/display/intel_drrs.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_drrs.c b/drivers/gpu/drm/i915/display/intel_drrs.c
index 166caf293f7bc..04bc296761be0 100644
--- a/drivers/gpu/drm/i915/display/intel_drrs.c
+++ b/drivers/gpu/drm/i915/display/intel_drrs.c
@@ -236,6 +236,11 @@ static void intel_drrs_frontbuffer_update(struct drm_i915_private *dev_priv,
 		else
 			crtc->drrs.busy_frontbuffer_bits &= ~frontbuffer_bits;
 
+		if (!intel_drrs_is_active(crtc)) {
+			mutex_unlock(&crtc->drrs.mutex);
+			continue;
+		}
+
 		/* flush/invalidate means busy screen hence upclock */
 		intel_drrs_set_state(crtc, DRRS_REFRESH_RATE_HIGH);
 
-- 
2.36.0