1 // SPDX-License-Identifier: GPL-2.0-only
3  * Driver for MegaChips STDP4028 with GE B850v3 firmware (LVDS-DP)
4  * Driver for MegaChips STDP2690 with GE B850v3 firmware (DP-DP++)
10  * This driver creates a drm_bridge and a drm_connector for the LVDS to DP++
11  * display bridge of the GE B850v3. There are two physical bridges on the video
12  * signal pipeline: a STDP4028(LVDS to DP) and a STDP2690(DP to DP++). The
19  *   Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output
61 	struct drm_bridge bridge;  member
70 	struct i2c_adapter *adapter = client->adapter;  in stdp2690_get_edid()
77 			.addr	= client->addr,  in stdp2690_get_edid()
82 			.addr	= client->addr,  in stdp2690_get_edid()
133 static struct edid *ge_b850v3_lvds_get_edid(struct drm_bridge *bridge,  in ge_b850v3_lvds_get_edid()  argument
138 	client = ge_b850v3_lvds_ptr->stdp2690_i2c;  in ge_b850v3_lvds_get_edid()
148 	edid = ge_b850v3_lvds_get_edid(&ge_b850v3_lvds_ptr->bridge, connector);  in ge_b850v3_lvds_get_modes()
169 static enum drm_connector_status ge_b850v3_lvds_bridge_detect(struct drm_bridge *bridge)  in ge_b850v3_lvds_bridge_detect()  argument
172 			ge_b850v3_lvds_ptr->stdp4028_i2c;  in ge_b850v3_lvds_bridge_detect()
190 	return ge_b850v3_lvds_bridge_detect(&ge_b850v3_lvds_ptr->bridge);  in ge_b850v3_lvds_detect()
202 static int ge_b850v3_lvds_create_connector(struct drm_bridge *bridge)  in ge_b850v3_lvds_create_connector()  argument
204 	struct drm_connector *connector = &ge_b850v3_lvds_ptr->connector;  in ge_b850v3_lvds_create_connector()
207 	if (!bridge->encoder) {  in ge_b850v3_lvds_create_connector()
209 		return -ENODEV;  in ge_b850v3_lvds_create_connector()
212 	connector->polled = DRM_CONNECTOR_POLL_HPD;  in ge_b850v3_lvds_create_connector()
217 	ret = drm_connector_init(bridge->dev, connector,  in ge_b850v3_lvds_create_connector()
225 	return drm_connector_attach_encoder(connector, bridge->encoder);  in ge_b850v3_lvds_create_connector()
231 			= ge_b850v3_lvds_ptr->stdp4028_i2c;  in ge_b850v3_lvds_irq_handler()
237 	if (ge_b850v3_lvds_ptr->bridge.dev)  in ge_b850v3_lvds_irq_handler()
238 		drm_kms_helper_hotplug_event(ge_b850v3_lvds_ptr->bridge.dev);  in ge_b850v3_lvds_irq_handler()
243 static int ge_b850v3_lvds_attach(struct drm_bridge *bridge,  in ge_b850v3_lvds_attach()  argument
247 			= ge_b850v3_lvds_ptr->stdp4028_i2c;  in ge_b850v3_lvds_attach()
249 	/* Configures the bridge to re-enable interrupts after each ack. */  in ge_b850v3_lvds_attach()
262 	return ge_b850v3_lvds_create_connector(bridge);  in ge_b850v3_lvds_attach()
284 		return -ENOMEM;  in ge_b850v3_lvds_init()
297 	 * removing the bridge in their remove() function  in ge_b850v3_lvds_remove()
300 	    !ge_b850v3_lvds_ptr->stdp2690_i2c ||  in ge_b850v3_lvds_remove()
301 		!ge_b850v3_lvds_ptr->stdp4028_i2c)  in ge_b850v3_lvds_remove()
304 	drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge);  in ge_b850v3_lvds_remove()
313 	struct i2c_client *stdp4028_i2c = ge_b850v3_lvds_ptr->stdp4028_i2c;  in ge_b850v3_register()
314 	struct device *dev = &stdp4028_i2c->dev;  in ge_b850v3_register()
316 	/* drm bridge initialization */  in ge_b850v3_register()
317 	ge_b850v3_lvds_ptr->bridge.funcs = &ge_b850v3_lvds_funcs;  in ge_b850v3_register()
318 	ge_b850v3_lvds_ptr->bridge.ops = DRM_BRIDGE_OP_DETECT |  in ge_b850v3_register()
320 	ge_b850v3_lvds_ptr->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;  in ge_b850v3_register()
321 	ge_b850v3_lvds_ptr->bridge.of_node = dev->of_node;  in ge_b850v3_register()
322 	drm_bridge_add(&ge_b850v3_lvds_ptr->bridge);  in ge_b850v3_register()
329 	if (!stdp4028_i2c->irq)  in ge_b850v3_register()
332 	return devm_request_threaded_irq(&stdp4028_i2c->dev,  in ge_b850v3_register()
333 			stdp4028_i2c->irq, NULL,  in ge_b850v3_register()
336 			"ge-b850v3-lvds-dp", ge_b850v3_lvds_ptr);  in ge_b850v3_register()
342 	struct device *dev = &stdp4028_i2c->dev;  in stdp4028_ge_b850v3_fw_probe()
350 	ge_b850v3_lvds_ptr->stdp4028_i2c = stdp4028_i2c;  in stdp4028_ge_b850v3_fw_probe()
354 	if (!ge_b850v3_lvds_ptr->stdp2690_i2c)  in stdp4028_ge_b850v3_fw_probe()
372 	{ .compatible = "megachips,stdp4028-ge-b850v3-fw" },
382 		.name		= "stdp4028-ge-b850v3-fw",
390 	struct device *dev = &stdp2690_i2c->dev;  in stdp2690_ge_b850v3_fw_probe()
398 	ge_b850v3_lvds_ptr->stdp2690_i2c = stdp2690_i2c;  in stdp2690_ge_b850v3_fw_probe()
402 	if (!ge_b850v3_lvds_ptr->stdp4028_i2c)  in stdp2690_ge_b850v3_fw_probe()
420 	{ .compatible = "megachips,stdp2690-ge-b850v3-fw" },
430 		.name		= "stdp2690-ge-b850v3-fw",
456 MODULE_DESCRIPTION("GE LVDS to DP++ display bridge)");