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2024-01-04 1543e317f1da31b75942316931e8f491a8920811 
 kernel/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Driver for MegaChips STDP4028 with GE B850v3 firmware (LVDS-DP)
34  * Driver for MegaChips STDP2690 with GE B850v3 firmware (DP-DP++)
....@@ -5,17 +6,6 @@
56  * Copyright (c) 2017, Collabora Ltd.
67  * Copyright (c) 2017, General Electric Company
78 
8
- * This program is free software; you can redistribute it and/or modify it
9
- * under the terms and conditions of the GNU General Public License,
10
- * version 2, as published by the Free Software Foundation.
11
-
12
- * This program is distributed in the hope it will be useful, but WITHOUT
13
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15
- * more details.
16
-
17
- * You should have received a copy of the GNU General Public License
18
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
199 
2010  * This driver creates a drm_bridge and a drm_connector for the LVDS to DP++
2111  * display bridge of the GE B850v3. There are two physical bridges on the video
....@@ -27,18 +17,18 @@
2717  * signal pipeline is as follows:
2818  *
2919  *   Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output
30
- *
3120  */
3221 
33
-#include <linux/gpio.h>
3422 #include <linux/i2c.h>
3523 #include <linux/module.h>
3624 #include <linux/of.h>
25
+
3726 #include <drm/drm_atomic.h>
3827 #include <drm/drm_atomic_helper.h>
39
-#include <drm/drm_crtc_helper.h>
28
+#include <drm/drm_bridge.h>
4029 #include <drm/drm_edid.h>
41
-#include <drm/drmP.h>
30
+#include <drm/drm_print.h>
31
+#include <drm/drm_probe_helper.h>
4232 
4333 #define EDID_EXT_BLOCK_CNT 0x7E
4434 
....@@ -71,7 +61,6 @@
7161 	struct drm_bridge bridge;
7262 	struct i2c_client *stdp4028_i2c;
7363 	struct i2c_client *stdp2690_i2c;
74
-	struct edid *edid;
7564 };
7665 
7766 static struct ge_b850v3_lvds *ge_b850v3_lvds_ptr;
....@@ -141,22 +130,26 @@
141130 	return NULL;
142131 }
143132 
144
-static int ge_b850v3_lvds_get_modes(struct drm_connector *connector)
133
+static struct edid *ge_b850v3_lvds_get_edid(struct drm_bridge *bridge,
134
+					    struct drm_connector *connector)
145135 {
146136 	struct i2c_client *client;
147
-	int num_modes = 0;
148137 
149138 	client = ge_b850v3_lvds_ptr->stdp2690_i2c;
150139 
151
-	kfree(ge_b850v3_lvds_ptr->edid);
152
-	ge_b850v3_lvds_ptr->edid = (struct edid *)stdp2690_get_edid(client);
140
+	return (struct edid *)stdp2690_get_edid(client);
141
+}
153142 
154
-	if (ge_b850v3_lvds_ptr->edid) {
155
-		drm_connector_update_edid_property(connector,
156
-						      ge_b850v3_lvds_ptr->edid);
157
-		num_modes = drm_add_edid_modes(connector,
158
-					       ge_b850v3_lvds_ptr->edid);
159
-	}
143
+static int ge_b850v3_lvds_get_modes(struct drm_connector *connector)
144
+{
145
+	struct edid *edid;
146
+	int num_modes;
147
+
148
+	edid = ge_b850v3_lvds_get_edid(&ge_b850v3_lvds_ptr->bridge, connector);
149
+
150
+	drm_connector_update_edid_property(connector, edid);
151
+	num_modes = drm_add_edid_modes(connector, edid);
152
+	kfree(edid);
160153 
161154 	return num_modes;
162155 }
....@@ -173,8 +166,7 @@
173166 	.mode_valid = ge_b850v3_lvds_mode_valid,
174167 };
175168 
176
-static enum drm_connector_status ge_b850v3_lvds_detect(
177
-		struct drm_connector *connector, bool force)
169
+static enum drm_connector_status ge_b850v3_lvds_bridge_detect(struct drm_bridge *bridge)
178170 {
179171 	struct i2c_client *stdp4028_i2c =
180172 			ge_b850v3_lvds_ptr->stdp4028_i2c;
....@@ -192,6 +184,12 @@
192184 	return connector_status_unknown;
193185 }
194186 
187
+static enum drm_connector_status ge_b850v3_lvds_detect(struct drm_connector *connector,
188
+						       bool force)
189
+{
190
+	return ge_b850v3_lvds_bridge_detect(&ge_b850v3_lvds_ptr->bridge);
191
+}
192
+
195193 static const struct drm_connector_funcs ge_b850v3_lvds_connector_funcs = {
196194 	.fill_modes = drm_helper_probe_single_connector_modes,
197195 	.detect = ge_b850v3_lvds_detect,
....@@ -201,26 +199,9 @@
201199 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
202200 };
203201 
204
-static irqreturn_t ge_b850v3_lvds_irq_handler(int irq, void *dev_id)
205
-{
206
-	struct i2c_client *stdp4028_i2c
207
-			= ge_b850v3_lvds_ptr->stdp4028_i2c;
208
-
209
-	i2c_smbus_write_word_data(stdp4028_i2c,
210
-				  STDP4028_DPTX_IRQ_STS_REG,
211
-				  STDP4028_DPTX_IRQ_CLEAR);
212
-
213
-	if (ge_b850v3_lvds_ptr->connector.dev)
214
-		drm_kms_helper_hotplug_event(ge_b850v3_lvds_ptr->connector.dev);
215
-
216
-	return IRQ_HANDLED;
217
-}
218
-
219
-static int ge_b850v3_lvds_attach(struct drm_bridge *bridge)
202
+static int ge_b850v3_lvds_create_connector(struct drm_bridge *bridge)
220203 {
221204 	struct drm_connector *connector = &ge_b850v3_lvds_ptr->connector;
222
-	struct i2c_client *stdp4028_i2c
223
-			= ge_b850v3_lvds_ptr->stdp4028_i2c;
224205 	int ret;
225206 
226207 	if (!bridge->encoder) {
....@@ -241,9 +222,29 @@
241222 		return ret;
242223 	}
243224 
244
-	ret = drm_connector_attach_encoder(connector, bridge->encoder);
245
-	if (ret)
246
-		return ret;
225
+	return drm_connector_attach_encoder(connector, bridge->encoder);
226
+}
227
+
228
+static irqreturn_t ge_b850v3_lvds_irq_handler(int irq, void *dev_id)
229
+{
230
+	struct i2c_client *stdp4028_i2c
231
+			= ge_b850v3_lvds_ptr->stdp4028_i2c;
232
+
233
+	i2c_smbus_write_word_data(stdp4028_i2c,
234
+				  STDP4028_DPTX_IRQ_STS_REG,
235
+				  STDP4028_DPTX_IRQ_CLEAR);
236
+
237
+	if (ge_b850v3_lvds_ptr->bridge.dev)
238
+		drm_kms_helper_hotplug_event(ge_b850v3_lvds_ptr->bridge.dev);
239
+
240
+	return IRQ_HANDLED;
241
+}
242
+
243
+static int ge_b850v3_lvds_attach(struct drm_bridge *bridge,
244
+				 enum drm_bridge_attach_flags flags)
245
+{
246
+	struct i2c_client *stdp4028_i2c
247
+			= ge_b850v3_lvds_ptr->stdp4028_i2c;
247248 
248249 	/* Configures the bridge to re-enable interrupts after each ack. */
249250 	i2c_smbus_write_word_data(stdp4028_i2c,
....@@ -255,11 +256,16 @@
255256 				  STDP4028_DPTX_IRQ_EN_REG,
256257 				  STDP4028_DPTX_IRQ_CONFIG);
257258 
258
-	return 0;
259
+	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
260
+		return 0;
261
+
262
+	return ge_b850v3_lvds_create_connector(bridge);
259263 }
260264 
261265 static const struct drm_bridge_funcs ge_b850v3_lvds_funcs = {
262266 	.attach = ge_b850v3_lvds_attach,
267
+	.detect = ge_b850v3_lvds_bridge_detect,
268
+	.get_edid = ge_b850v3_lvds_get_edid,
263269 };
264270 
265271 static int ge_b850v3_lvds_init(struct device *dev)
....@@ -290,12 +296,12 @@
290296 	 * This check is to avoid both the drivers
291297 	 * removing the bridge in their remove() function
292298 	 */
293
-	if (!ge_b850v3_lvds_ptr)
299
+	if (!ge_b850v3_lvds_ptr ||
300
+	    !ge_b850v3_lvds_ptr->stdp2690_i2c ||
301
+		!ge_b850v3_lvds_ptr->stdp4028_i2c)
294302 		goto out;
295303 
296304 	drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge);
297
-
298
-	kfree(ge_b850v3_lvds_ptr->edid);
299305 
300306 	ge_b850v3_lvds_ptr = NULL;
301307 out:
....@@ -309,6 +315,9 @@
309315 
310316 	/* drm bridge initialization */
311317 	ge_b850v3_lvds_ptr->bridge.funcs = &ge_b850v3_lvds_funcs;
318
+	ge_b850v3_lvds_ptr->bridge.ops = DRM_BRIDGE_OP_DETECT |
319
+					 DRM_BRIDGE_OP_EDID;
320
+	ge_b850v3_lvds_ptr->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
312321 	ge_b850v3_lvds_ptr->bridge.of_node = dev->of_node;
313322 	drm_bridge_add(&ge_b850v3_lvds_ptr->bridge);
314323 
....@@ -435,7 +444,11 @@
435444 	if (ret)
436445 		return ret;
437446 
438
-	return i2c_add_driver(&stdp2690_ge_b850v3_fw_driver);
447
+	ret = i2c_add_driver(&stdp2690_ge_b850v3_fw_driver);
448
+	if (ret)
449
+		i2c_del_driver(&stdp4028_ge_b850v3_fw_driver);
450
+
451
+	return ret;
439452 }
440453 module_init(stdpxxxx_ge_b850v3_init);
441454