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>
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 4f35be7..452591b 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3508,6 +3508,9 @@
page_flip->reserved != 0)
return -EINVAL;
+ if ((page_flip->flags & DRM_MODE_PAGE_FLIP_ASYNC) && !dev->mode_config.async_page_flip)
+ return -EINVAL;
+
obj = drm_mode_object_find(dev, page_flip->crtc_id, DRM_MODE_OBJECT_CRTC);
if (!obj)
return -EINVAL;