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
71 	struct i2c_adapter *adapter = client->adapter;  in stdp2690_read_block()
76 			.addr	= client->addr,  in stdp2690_read_block()
81 			.addr	= client->addr,  in stdp2690_read_block()
89 		return -1;  in stdp2690_read_block()
94 static const struct drm_edid *ge_b850v3_lvds_edid_read(struct drm_bridge *bridge,  in ge_b850v3_lvds_edid_read()  argument
99 	client = ge_b850v3_lvds_ptr->stdp2690_i2c;  in ge_b850v3_lvds_edid_read()
109 	drm_edid = ge_b850v3_lvds_edid_read(&ge_b850v3_lvds_ptr->bridge, connector);  in ge_b850v3_lvds_get_modes()
130 static enum drm_connector_status ge_b850v3_lvds_bridge_detect(struct drm_bridge *bridge)  in ge_b850v3_lvds_bridge_detect()  argument
133 			ge_b850v3_lvds_ptr->stdp4028_i2c;  in ge_b850v3_lvds_bridge_detect()
151 	return ge_b850v3_lvds_bridge_detect(&ge_b850v3_lvds_ptr->bridge);  in ge_b850v3_lvds_detect()
163 static int ge_b850v3_lvds_create_connector(struct drm_bridge *bridge)  in ge_b850v3_lvds_create_connector()  argument
165 	struct drm_connector *connector = &ge_b850v3_lvds_ptr->connector;  in ge_b850v3_lvds_create_connector()
168 	connector->polled = DRM_CONNECTOR_POLL_HPD;  in ge_b850v3_lvds_create_connector()
173 	ret = drm_connector_init(bridge->dev, connector,  in ge_b850v3_lvds_create_connector()
181 	return drm_connector_attach_encoder(connector, bridge->encoder);  in ge_b850v3_lvds_create_connector()
187 			= ge_b850v3_lvds_ptr->stdp4028_i2c;  in ge_b850v3_lvds_irq_handler()
193 	if (ge_b850v3_lvds_ptr->bridge.dev)  in ge_b850v3_lvds_irq_handler()
194 		drm_kms_helper_hotplug_event(ge_b850v3_lvds_ptr->bridge.dev);  in ge_b850v3_lvds_irq_handler()
199 static int ge_b850v3_lvds_attach(struct drm_bridge *bridge,  in ge_b850v3_lvds_attach()  argument
203 			= ge_b850v3_lvds_ptr->stdp4028_i2c;  in ge_b850v3_lvds_attach()
205 	/* Configures the bridge to re-enable interrupts after each ack. */  in ge_b850v3_lvds_attach()
218 	return ge_b850v3_lvds_create_connector(bridge);  in ge_b850v3_lvds_attach()
240 		return -ENOMEM;  in ge_b850v3_lvds_init()
253 	 * removing the bridge in their remove() function  in ge_b850v3_lvds_remove()
256 	    !ge_b850v3_lvds_ptr->stdp2690_i2c ||  in ge_b850v3_lvds_remove()
257 		!ge_b850v3_lvds_ptr->stdp4028_i2c)  in ge_b850v3_lvds_remove()
260 	drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge);  in ge_b850v3_lvds_remove()
269 	struct i2c_client *stdp4028_i2c = ge_b850v3_lvds_ptr->stdp4028_i2c;  in ge_b850v3_register()
270 	struct device *dev = &stdp4028_i2c->dev;  in ge_b850v3_register()
272 	/* drm bridge initialization */  in ge_b850v3_register()
273 	ge_b850v3_lvds_ptr->bridge.funcs = &ge_b850v3_lvds_funcs;  in ge_b850v3_register()
274 	ge_b850v3_lvds_ptr->bridge.ops = DRM_BRIDGE_OP_DETECT |  in ge_b850v3_register()
276 	ge_b850v3_lvds_ptr->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;  in ge_b850v3_register()
277 	ge_b850v3_lvds_ptr->bridge.of_node = dev->of_node;  in ge_b850v3_register()
278 	drm_bridge_add(&ge_b850v3_lvds_ptr->bridge);  in ge_b850v3_register()
285 	if (!stdp4028_i2c->irq)  in ge_b850v3_register()
288 	return devm_request_threaded_irq(&stdp4028_i2c->dev,  in ge_b850v3_register()
289 			stdp4028_i2c->irq, NULL,  in ge_b850v3_register()
292 			"ge-b850v3-lvds-dp", ge_b850v3_lvds_ptr);  in ge_b850v3_register()
297 	struct device *dev = &stdp4028_i2c->dev;  in stdp4028_ge_b850v3_fw_probe()
305 	ge_b850v3_lvds_ptr->stdp4028_i2c = stdp4028_i2c;  in stdp4028_ge_b850v3_fw_probe()
309 	if (!ge_b850v3_lvds_ptr->stdp2690_i2c)  in stdp4028_ge_b850v3_fw_probe()
327 	{ .compatible = "megachips,stdp4028-ge-b850v3-fw" },
337 		.name		= "stdp4028-ge-b850v3-fw",
344 	struct device *dev = &stdp2690_i2c->dev;  in stdp2690_ge_b850v3_fw_probe()
352 	ge_b850v3_lvds_ptr->stdp2690_i2c = stdp2690_i2c;  in stdp2690_ge_b850v3_fw_probe()
356 	if (!ge_b850v3_lvds_ptr->stdp4028_i2c)  in stdp2690_ge_b850v3_fw_probe()
374 	{ .compatible = "megachips,stdp2690-ge-b850v3-fw" },
384 		.name		= "stdp2690-ge-b850v3-fw",
414 MODULE_DESCRIPTION("GE LVDS to DP++ display bridge)");