26  * The DRM bridge connector helper object provides a DRM connector
27  * implementation that wraps a chain of &struct drm_bridge. The connector
32  * To use the helper, display controller drivers create a bridge connector with
34  * connector with the chain of bridges passed to the function and registers it
35  * with the DRM device. At that point the connector becomes fully usable, no
38  * The DRM bridge connector operations are implemented based on the operations
39  * provided by the bridges in the chain. Each connector operation is delegated
40  * to the bridge closest to the connector (at the end of the chain) that
46  * flag (none of the bridges shall create a DRM connector directly).
50  * struct drm_bridge_connector - A connector backed by a chain of bridges
54 	 * @base: The base DRM connector
66 	 * The last bridge in the chain (closest to the connector) that provides
73 	 * The last bridge in the chain (closest to the connector) that provides
80 	 * The last bridge in the chain (closest to the connector) that provides
81 	 * connector detection, if any (see &DRM_BRIDGE_OP_DETECT).
87 	 * The last bridge in the chain (closest to the connector) that provides
88 	 * connector modes detection, if any (see &DRM_BRIDGE_OP_MODES).
95 	 * HDMI connector infrastructure, if any (see &DRM_BRIDGE_OP_HDMI).
104  * Bridge Connector Hot-Plug Handling
107 static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,  in drm_bridge_connector_hpd_notify()  argument
111 		to_drm_bridge_connector(connector);  in drm_bridge_connector_hpd_notify()
124 	struct drm_connector *connector = &drm_bridge_connector->base;  in drm_bridge_connector_handle_hpd()  local
125 	struct drm_device *dev = connector->dev;  in drm_bridge_connector_handle_hpd()
128 	connector->status = status;  in drm_bridge_connector_handle_hpd()
131 	drm_bridge_connector_hpd_notify(connector, status);  in drm_bridge_connector_handle_hpd()
133 	drm_kms_helper_connector_hotplug_event(connector);  in drm_bridge_connector_handle_hpd()
142 static void drm_bridge_connector_oob_hotplug_event(struct drm_connector *connector,  in drm_bridge_connector_oob_hotplug_event()  argument
146 		to_drm_bridge_connector(connector);  in drm_bridge_connector_oob_hotplug_event()
151 static void drm_bridge_connector_enable_hpd(struct drm_connector *connector)  in drm_bridge_connector_enable_hpd()  argument
154 		to_drm_bridge_connector(connector);  in drm_bridge_connector_enable_hpd()
162 static void drm_bridge_connector_disable_hpd(struct drm_connector *connector)  in drm_bridge_connector_disable_hpd()  argument
165 		to_drm_bridge_connector(connector);  in drm_bridge_connector_disable_hpd()
173  * Bridge Connector Functions
177 drm_bridge_connector_detect(struct drm_connector *connector, bool force)  in drm_bridge_connector_detect()  argument
180 		to_drm_bridge_connector(connector);  in drm_bridge_connector_detect()
187 		drm_bridge_connector_hpd_notify(connector, status);  in drm_bridge_connector_detect()
189 		switch (connector->connector_type) {  in drm_bridge_connector_detect()
205 static void drm_bridge_connector_debugfs_init(struct drm_connector *connector,  in drm_bridge_connector_debugfs_init()  argument
209 		to_drm_bridge_connector(connector);  in drm_bridge_connector_debugfs_init()
219 static void drm_bridge_connector_reset(struct drm_connector *connector)  in drm_bridge_connector_reset()  argument
222 		to_drm_bridge_connector(connector);  in drm_bridge_connector_reset()
224 	drm_atomic_helper_connector_reset(connector);  in drm_bridge_connector_reset()
226 		__drm_atomic_helper_connector_hdmi_reset(connector,  in drm_bridge_connector_reset()
227 							 connector->state);  in drm_bridge_connector_reset()
241  * Bridge Connector Helper Functions
244 static int drm_bridge_connector_get_modes_edid(struct drm_connector *connector,  in drm_bridge_connector_get_modes_edid()  argument
251 	status = drm_bridge_connector_detect(connector, false);  in drm_bridge_connector_get_modes_edid()
255 	drm_edid = drm_bridge_edid_read(bridge, connector);  in drm_bridge_connector_get_modes_edid()
261 	drm_edid_connector_update(connector, drm_edid);  in drm_bridge_connector_get_modes_edid()
262 	n = drm_edid_connector_add_modes(connector);  in drm_bridge_connector_get_modes_edid()
268 	drm_edid_connector_update(connector, NULL);  in drm_bridge_connector_get_modes_edid()
272 static int drm_bridge_connector_get_modes(struct drm_connector *connector)  in drm_bridge_connector_get_modes()  argument
275 		to_drm_bridge_connector(connector);  in drm_bridge_connector_get_modes()
284 		return drm_bridge_connector_get_modes_edid(connector, bridge);  in drm_bridge_connector_get_modes()
292 		return bridge->funcs->get_modes(bridge, connector);  in drm_bridge_connector_get_modes()
310 drm_bridge_connector_tmds_char_rate_valid(const struct drm_connector *connector,  in drm_bridge_connector_tmds_char_rate_valid()  argument
315 		to_drm_bridge_connector(connector);  in drm_bridge_connector_tmds_char_rate_valid()
328 static int drm_bridge_connector_clear_infoframe(struct drm_connector *connector,  in drm_bridge_connector_clear_infoframe()  argument
332 		to_drm_bridge_connector(connector);  in drm_bridge_connector_clear_infoframe()
342 static int drm_bridge_connector_write_infoframe(struct drm_connector *connector,  in drm_bridge_connector_write_infoframe()  argument
347 		to_drm_bridge_connector(connector);  in drm_bridge_connector_write_infoframe()
364  * Bridge Connector Initialisation
368  * drm_bridge_connector_init - Initialise a connector for a chain of bridges
373  * device. The connector is associated with a chain of bridges that starts at
376  * them may create a DRM connector directly.
378  * Returns a pointer to the new connector on success, or a negative error
385 	struct drm_connector *connector;  in drm_bridge_connector_init()  local
403 	connector = &bridge_connector->base;  in drm_bridge_connector_init()
404 	connector->interlace_allowed = true;  in drm_bridge_connector_init()
407 	 * Initialise connector status handling. First locate the furthest  in drm_bridge_connector_init()
409 	 * initialise the connector polling mode, using HPD if available and  in drm_bridge_connector_init()
416 			connector->interlace_allowed = false;  in drm_bridge_connector_init()
447 			connector->fwnode = fwnode_handle_get(of_fwnode_handle(bridge->of_node));  in drm_bridge_connector_init()
461 		ret = drmm_connector_hdmi_init(drm, connector,  in drm_bridge_connector_init()
470 		ret = drmm_connector_init(drm, connector,  in drm_bridge_connector_init()
476 	drm_connector_helper_add(connector, &drm_bridge_connector_helper_funcs);  in drm_bridge_connector_init()
479 		connector->polled = DRM_CONNECTOR_POLL_HPD;  in drm_bridge_connector_init()
481 		connector->polled = DRM_CONNECTOR_POLL_CONNECT  in drm_bridge_connector_init()
485 		drm_panel_bridge_set_orientation(connector, panel_bridge);  in drm_bridge_connector_init()
487 	return connector;  in drm_bridge_connector_init()