1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0110-drm-vc4-Fix-sending-of-page-flip-completion-events-i.patch b/target/linux/brcm2708/patches-4.19/950-0110-drm-vc4-Fix-sending-of-page-flip-completion-events-i.patch
new file mode 100644
index 0000000000..c916ebfa96
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0110-drm-vc4-Fix-sending-of-page-flip-completion-events-i.patch
@@ -0,0 +1,42 @@
+From 562e0c66203a4f679c6adf6c0df91f7233df53b1 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Thu, 2 Feb 2017 09:42:18 -0800
+Subject: [PATCH] drm/vc4: Fix sending of page flip completion events
+ in FKMS mode.
+
+In the rewrite of vc4_crtc.c for fkms, I dropped the part of the
+CRTC's atomic flush handler that moved the completion event from the
+proposed atomic state change to the CRTC's current state.  That meant
+that when full screen pageflipping happened (glxgears -fullscreen in
+X, compton, por weston), the app would end up blocked firever waiting
+to draw its next frame.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/gpu/drm/vc4/vc4_firmware_kms.c | 15 +++++++++++++++
+ 1 file changed, 15 insertions(+)
+
+--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
++++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
+@@ -336,6 +336,21 @@ static int vc4_crtc_atomic_check(struct
+ static void vc4_crtc_atomic_flush(struct drm_crtc *crtc,
+ 				  struct drm_crtc_state *old_state)
+ {
++	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
++	struct drm_device *dev = crtc->dev;
++
++	if (crtc->state->event) {
++		unsigned long flags;
++
++		crtc->state->event->pipe = drm_crtc_index(crtc);
++
++		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
++
++		spin_lock_irqsave(&dev->event_lock, flags);
++		vc4_crtc->event = crtc->state->event;
++		crtc->state->event = NULL;
++		spin_unlock_irqrestore(&dev->event_lock, flags);
++	}
+ }
+ 
+ static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)