diff options
Diffstat (limited to 'include/drm/drm_atomic_helper.h')
| -rw-r--r-- | include/drm/drm_atomic_helper.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h index 33f982cd1a27..536a0b0091c3 100644 --- a/include/drm/drm_atomic_helper.h +++ b/include/drm/drm_atomic_helper.h @@ -210,6 +210,32 @@ int drm_atomic_helper_page_flip_target( plane))) /** + * drm_atomic_plane_enabling - check whether a plane is being enabled + * @old_plane_state: old atomic plane state + * @new_plane_state: new atomic plane state + * + * Checks the atomic state of a plane to determine whether it's being enabled + * or not. This also WARNs if it detects an invalid state (both CRTC and FB + * need to either both be NULL or both be non-NULL). + * + * RETURNS: + * True if the plane is being enabled, false otherwise. + */ +static inline bool drm_atomic_plane_enabling(struct drm_plane_state *old_plane_state, + struct drm_plane_state *new_plane_state) +{ + /* + * When enabling a plane, CRTC and FB should always be set together. + * Anything else should be considered a bug in the atomic core, so we + * gently warn about it. + */ + WARN_ON((!new_plane_state->crtc && new_plane_state->fb) || + (new_plane_state->crtc && !new_plane_state->fb)); + + return !old_plane_state->crtc && new_plane_state->crtc; +} + +/** * drm_atomic_plane_disabling - check whether a plane is being disabled * @old_plane_state: old atomic plane state * @new_plane_state: new atomic plane state |