[PATCH 68/81] drm/i915: Drop all flips waiting for the GPU when the CRTC is about to be disabled

[ville.syrjala@xxxxxxxxxxxxxxx]

From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_atomic.c |   36 +++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index e52d92a..36446d1 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -2471,9 +2471,23 @@ void intel_atomic_handle_vblank(struct drm_device *dev, int pipe)
 void intel_atomic_clear_flips(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_plane *intel_plane;
+	struct intel_flip *intel_flip, *next;
 	int pipe = intel_crtc->pipe;
+	unsigned long flags;
+	LIST_HEAD(flips);
+
+	/*
+	 * If there are flips still waiting for the GPU, remove them
+	 * from the list, so that they won't be able to move over to
+	 * drm_flip_helpers' possession after we've called
+	 * drm_flip_helper_clear().
+	 */
+	spin_lock_irqsave(&dev_priv->flip.lock, flags);
+	list_cut_position(&flips, &dev_priv->flip.list, dev_priv->flip.list.prev);
+	spin_unlock_irqrestore(&dev_priv->flip.lock, flags);
 
 	drm_flip_helper_clear(&intel_crtc->flip_helper);
 
@@ -2481,4 +2495,26 @@ void intel_atomic_clear_flips(struct drm_crtc *crtc)
 		if (intel_plane->pipe == pipe)
 			drm_flip_helper_clear(&intel_plane->flip_helper);
 	}
+
+	/*
+	 * Drop all non-ready flips. Doing this after calling
+	 * drm_flip_helper_clear() maintaines the correct order
+	 * of completion events.
+	 */
+	list_for_each_entry_safe(intel_flip, next, &flips, base.list) {
+		struct intel_ring_buffer *ring = intel_flip->ring;
+
+		if (ring) {
+			intel_flip->ring = NULL;
+			ring->irq_put(ring);
+		}
+
+		intel_flip_complete(&intel_flip->base);
+		/*
+		 * FIXME drm_flip_helper calls the following functions
+		 * from a workqueue. Perhaps we should do the same here?
+		 */
+		intel_flip_finish(&intel_flip->base);
+		intel_flip_cleanup(&intel_flip->base);
+	}
 }
-- 
1.7.8.6

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