struct drm_crtc_state — mutable CRTC state
struct drm_crtc_state {
struct drm_crtc * crtc;
bool enable;
bool active;
bool planes_changed:1;
bool mode_changed:1;
bool active_changed:1;
u32 plane_mask;
u32 last_vblank_count;
struct drm_display_mode adjusted_mode;
struct drm_display_mode mode;
struct drm_pending_vblank_event * event;
struct drm_atomic_state * state;
}; backpointer to the CRTC
whether the CRTC should be enabled, gates all other state
whether the CRTC is actively displaying (used for DPMS)
for use by helpers and drivers when computing state updates
for use by helpers and drivers when computing state updates
for use by helpers and drivers when computing state updates
bitmask of (1 << drm_plane_index(plane)) of attached planes
for helpers and drivers to capture the vblank of the update to ensure framebuffer cleanup isn't done too early
for use by helpers and drivers to compute adjusted mode timings
current mode timings
optional pointer to a DRM event to signal upon completion of the state update
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.