22  * The DRM bridge connector helper object provides a DRM connector
23  * implementation that wraps a chain of &struct drm_bridge. The connector
28  * To use the helper, display controller drivers create a bridge connector with
30  * connector with the chain of bridges passed to the function and registers it
31  * with the DRM device. At that point the connector becomes fully usable, no
34  * The DRM bridge connector operations are implemented based on the operations
35  * provided by the bridges in the chain. Each connector operation is delegated
36  * to the bridge closest to the connector (at the end of the chain) that
42  * flag (none of the bridges shall create a DRM connector directly).
46  * struct drm_bridge_connector - A connector backed by a chain of bridges
50 	 * @base: The base DRM connector
62 	 * The last bridge in the chain (closest to the connector) that provides
69 	 * The last bridge in the chain (closest to the connector) that provides
76 	 * The last bridge in the chain (closest to the connector) that provides
77 	 * connector detection, if any (see &DRM_BRIDGE_OP_DETECT).
83 	 * The last bridge in the chain (closest to the connector) that provides
84 	 * connector modes detection, if any (see &DRM_BRIDGE_OP_MODES).
93  * Bridge Connector Hot-Plug Handling
96 static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,  in drm_bridge_connector_hpd_notify()  argument
100 		to_drm_bridge_connector(connector);  in drm_bridge_connector_hpd_notify()
114 	struct drm_connector *connector = &drm_bridge_connector->base;  in drm_bridge_connector_hpd_cb()  local
115 	struct drm_device *dev = connector->dev;  in drm_bridge_connector_hpd_cb()
119 	old_status = connector->status;  in drm_bridge_connector_hpd_cb()
120 	connector->status = status;  in drm_bridge_connector_hpd_cb()
126 	drm_bridge_connector_hpd_notify(connector, status);  in drm_bridge_connector_hpd_cb()
132  * drm_bridge_connector_enable_hpd - Enable hot-plug detection for the connector
133  * @connector: The DRM bridge connector
135  * This function enables hot-plug detection for the given bridge connector.
138 void drm_bridge_connector_enable_hpd(struct drm_connector *connector)  in drm_bridge_connector_enable_hpd()  argument
141 		to_drm_bridge_connector(connector);  in drm_bridge_connector_enable_hpd()
152  * connector
153  * @connector: The DRM bridge connector
155  * This function disables hot-plug detection for the given bridge connector.
158 void drm_bridge_connector_disable_hpd(struct drm_connector *connector)  in drm_bridge_connector_disable_hpd()  argument
161 		to_drm_bridge_connector(connector);  in drm_bridge_connector_disable_hpd()
170  * Bridge Connector Functions
174 drm_bridge_connector_detect(struct drm_connector *connector, bool force)  in drm_bridge_connector_detect()  argument
177 		to_drm_bridge_connector(connector);  in drm_bridge_connector_detect()
184 		drm_bridge_connector_hpd_notify(connector, status);  in drm_bridge_connector_detect()
186 		switch (connector->connector_type) {  in drm_bridge_connector_detect()
202 static void drm_bridge_connector_destroy(struct drm_connector *connector)  in drm_bridge_connector_destroy()  argument
205 		to_drm_bridge_connector(connector);  in drm_bridge_connector_destroy()
213 	drm_connector_unregister(connector);  in drm_bridge_connector_destroy()
214 	drm_connector_cleanup(connector);  in drm_bridge_connector_destroy()
229  * Bridge Connector Helper Functions
232 static int drm_bridge_connector_get_modes_edid(struct drm_connector *connector,  in drm_bridge_connector_get_modes_edid()  argument
239 	status = drm_bridge_connector_detect(connector, false);  in drm_bridge_connector_get_modes_edid()
243 	edid = bridge->funcs->get_edid(bridge, connector);  in drm_bridge_connector_get_modes_edid()
249 	drm_connector_update_edid_property(connector, edid);  in drm_bridge_connector_get_modes_edid()
250 	n = drm_add_edid_modes(connector, edid);  in drm_bridge_connector_get_modes_edid()
256 	drm_connector_update_edid_property(connector, NULL);  in drm_bridge_connector_get_modes_edid()
260 static int drm_bridge_connector_get_modes(struct drm_connector *connector)  in drm_bridge_connector_get_modes()  argument
263 		to_drm_bridge_connector(connector);  in drm_bridge_connector_get_modes()
272 		return drm_bridge_connector_get_modes_edid(connector, bridge);  in drm_bridge_connector_get_modes()
280 		return bridge->funcs->get_modes(bridge, connector);  in drm_bridge_connector_get_modes()
296  * Bridge Connector Initialisation
300  * drm_bridge_connector_init - Initialise a connector for a chain of bridges
305  * device. The connector is associated with a chain of bridges that starts at
308  * them may create a DRM connector directly.
310  * Returns a pointer to the new connector on success, or a negative error
317 	struct drm_connector *connector;  in drm_bridge_connector_init()  local
332 	connector = &bridge_connector->base;  in drm_bridge_connector_init()
333 	connector->interlace_allowed = true;  in drm_bridge_connector_init()
336 	 * Initialise connector status handling. First locate the furthest  in drm_bridge_connector_init()
338 	 * initialise the connector polling mode, using HPD if available and  in drm_bridge_connector_init()
345 			connector->interlace_allowed = false;  in drm_bridge_connector_init()
368 	drm_connector_init_with_ddc(drm, connector, &drm_bridge_connector_funcs,  in drm_bridge_connector_init()
370 	drm_connector_helper_add(connector, &drm_bridge_connector_helper_funcs);  in drm_bridge_connector_init()
373 		connector->polled = DRM_CONNECTOR_POLL_HPD;  in drm_bridge_connector_init()
375 		connector->polled = DRM_CONNECTOR_POLL_CONNECT  in drm_bridge_connector_init()
378 	return connector;  in drm_bridge_connector_init()