[PATCH weston 2/4] compositor-drm: Only request vblank events if needed

[Ander Conselvan de Oliveira]

If the sprite is disabled and we're not enabling it on the next frame,
nothing is done in the vblank handler, so there's no need to ask for a
vblank event.
---
 src/compositor-drm.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/compositor-drm.c b/src/compositor-drm.c
index ee57bf0..3a7d432 100644
--- a/src/compositor-drm.c
+++ b/src/compositor-drm.c
@@ -391,7 +391,8 @@ drm_output_repaint(struct weston_output *output_base,
 			.request.sequence = 1,
 		};
 
-		if (!drm_sprite_crtc_supported(output_base, s->possible_crtcs))
+		if ((!s->fb_id && !s->pending_fb_id) ||
+		    !drm_sprite_crtc_supported(output_base, s->possible_crtcs))
 			continue;
 
 		ret = drmModeSetPlane(compositor->drm.fd, s->plane_id,
-- 
1.7.10.4