This requests that the driver perform the page flip as soon as possible, not necessarily waiting for vblank.
Signed-off-by: Keith Packard keithp@keithp.com --- include/uapi/drm/drm_mode.h | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 53db7ce..5508117 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -412,7 +412,8 @@ struct drm_mode_crtc_lut { };
#define DRM_MODE_PAGE_FLIP_EVENT 0x01 -#define DRM_MODE_PAGE_FLIP_FLAGS DRM_MODE_PAGE_FLIP_EVENT +#define DRM_MODE_PAGE_FLIP_ASYNC 0x02 +#define DRM_MODE_PAGE_FLIP_FLAGS (DRM_MODE_PAGE_FLIP_EVENT|DRM_MODE_PAGE_FLIP_ASYNC)
/* * Request a page flip on the specified crtc. @@ -426,11 +427,14 @@ struct drm_mode_crtc_lut { * flip is already pending as the ioctl is called, EBUSY will be * returned. * - * The ioctl supports one flag, DRM_MODE_PAGE_FLIP_EVENT, which will - * request that drm sends back a vblank event (see drm.h: struct - * drm_event_vblank) when the page flip is done. The user_data field - * passed in with this ioctl will be returned as the user_data field - * in the vblank event struct. + * Flag DRM_MODE_PAGE_FLIP_EVENT requests that drm sends back a vblank + * event (see drm.h: struct drm_event_vblank) when the page flip is + * done. The user_data field passed in with this ioctl will be + * returned as the user_data field in the vblank event struct. + * + * Flag DRM_MODE_PAGE_FLIP_ASYNC requests that the flip happen + * 'as soon as possible', meaning that it not delay waiting for vblank. + * This may cause tearing on the screen. * * The reserved field must be zero until we figure out something * clever to use it for.