drm: Advertise async page flip ability through GETCAP ioctl

Let applications know whether the kernel supports asynchronous page
flipping.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Dave Airlie <airlied@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 0c7fec5b8fef..78ca1512c73f 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -842,6 +842,9 @@ struct drm_mode_config {
 
         /* dumb ioctl parameters */
         uint32_t preferred_depth, prefer_shadow;
+
+        /* whether async page flip is supported or not */
+        bool async_page_flip;
 };
 
 #define obj_to_crtc(x) container_of(x, struct drm_crtc, base)