diff options
Diffstat (limited to 'include/drm/drm_crtc.h')
| -rw-r--r-- | include/drm/drm_crtc.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index b86329813ad..4ee78212f8b 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -238,6 +238,7 @@ struct drm_atomic_state; /** * struct drm_crtc_state - mutable CRTC state * @enable: whether the CRTC should be enabled, gates all other state + * @active: whether the CRTC is actively displaying (used for DPMS) * @mode_changed: for use by helpers and drivers when computing state updates * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes * @last_vblank_count: for helpers and drivers to capture the vblank of the @@ -248,9 +249,16 @@ struct drm_atomic_state; * @event: optional pointer to a DRM event to signal upon completion of the * state update * @state: backpointer to global drm_atomic_state + * + * Note that the distinction between @enable and @active is rather subtile: + * Flipping @active while @enable is set without changing anything else may + * never return in a failure from the ->atomic_check callback. Userspace assumes + * that a DPMS On will always succeed. In other words: @enable controls resource + * assignment, @active controls the actual hardware state. */ struct drm_crtc_state { bool enable; + bool active; /* computed state bits used by helpers and drivers */ bool planes_changed : 1; |