drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c

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++
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
60 	struct drm_connector connector;
71 	struct i2c_adapter *adapter = client->adapter;
76 			.addr	= client->addr,
81 			.addr	= client->addr,
89 		return -1;
95 						       struct drm_connector *connector)
99 	client = ge_b850v3_lvds_ptr->stdp2690_i2c;
101 	return drm_edid_read_custom(connector, stdp2690_read_block, client);
104 static int ge_b850v3_lvds_get_modes(struct drm_connector *connector)
109 	drm_edid = ge_b850v3_lvds_edid_read(&ge_b850v3_lvds_ptr->bridge, connector);
111 	drm_edid_connector_update(connector, drm_edid);
112 	num_modes = drm_edid_connector_add_modes(connector);
124 ge_b850v3_lvds_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector)
127 			ge_b850v3_lvds_ptr->stdp4028_i2c;
142 static enum drm_connector_status ge_b850v3_lvds_detect(struct drm_connector *connector,
145 	return ge_b850v3_lvds_bridge_detect(&ge_b850v3_lvds_ptr->bridge, connector);
159 	struct drm_connector *connector = &ge_b850v3_lvds_ptr->connector;
162 	connector->polled = DRM_CONNECTOR_POLL_HPD;
164 	drm_connector_helper_add(connector,
167 	ret = drm_connector_init(bridge->dev, connector,
171 		DRM_ERROR("Failed to initialize connector with drm\n");
175 	return drm_connector_attach_encoder(connector, bridge->encoder);
181 			= ge_b850v3_lvds_ptr->stdp4028_i2c;
187 	if (ge_b850v3_lvds_ptr->bridge.dev)
188 		drm_kms_helper_hotplug_event(ge_b850v3_lvds_ptr->bridge.dev);
198 			= ge_b850v3_lvds_ptr->stdp4028_i2c;
200 	/* Configures the bridge to re-enable interrupts after each ack. */
249 	    !ge_b850v3_lvds_ptr->stdp2690_i2c ||
250 		!ge_b850v3_lvds_ptr->stdp4028_i2c)
253 	drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge);
262 	struct i2c_client *stdp4028_i2c = ge_b850v3_lvds_ptr->stdp4028_i2c;
263 	struct device *dev = &stdp4028_i2c->dev;
266 	ge_b850v3_lvds_ptr->bridge.ops = DRM_BRIDGE_OP_DETECT |
268 	ge_b850v3_lvds_ptr->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
269 	ge_b850v3_lvds_ptr->bridge.of_node = dev->of_node;
270 	drm_bridge_add(&ge_b850v3_lvds_ptr->bridge);
277 	if (!stdp4028_i2c->irq)
280 	return devm_request_threaded_irq(&stdp4028_i2c->dev,
281 			stdp4028_i2c->irq, NULL,
284 			"ge-b850v3-lvds-dp", ge_b850v3_lvds_ptr);
289 	struct device *dev = &stdp4028_i2c->dev;
297 	ge_b850v3_lvds_ptr->stdp4028_i2c = stdp4028_i2c;
301 	if (!ge_b850v3_lvds_ptr->stdp2690_i2c)
319 	{ .compatible = "megachips,stdp4028-ge-b850v3-fw" },
329 		.name		= "stdp4028-ge-b850v3-fw",
336 	struct device *dev = &stdp2690_i2c->dev;
344 	ge_b850v3_lvds_ptr->stdp2690_i2c = stdp2690_i2c;
348 	if (!ge_b850v3_lvds_ptr->stdp4028_i2c)
366 	{ .compatible = "megachips,stdp2690-ge-b850v3-fw" },
376 		.name		= "stdp2690-ge-b850v3-fw",
406 MODULE_DESCRIPTION("GE LVDS to DP++ display bridge)");