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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/gpu/drm/bridge/nxp-ptn3460.c
....@@ -1,32 +1,23 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * NXP PTN3460 DP/LVDS bridge driver
34  *
45  * Copyright (C) 2013 Google, Inc.
5
- *
6
- * This software is licensed under the terms of the GNU General Public
7
- * License version 2, as published by the Free Software Foundation, and
8
- * may be copied, distributed, and modified under those terms.
9
- *
10
- * This program is distributed in the hope that it will be useful,
11
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13
- * GNU General Public License for more details.
146  */
157 
168 #include <linux/delay.h>
17
-#include <linux/gpio.h>
189 #include <linux/gpio/consumer.h>
1910 #include <linux/i2c.h>
2011 #include <linux/module.h>
2112 #include <linux/of.h>
22
-#include <linux/of_gpio.h>
2313 #include <drm/drm_atomic_helper.h>
14
+#include <drm/drm_bridge.h>
2415 #include <drm/drm_crtc.h>
25
-#include <drm/drm_crtc_helper.h>
2616 #include <drm/drm_edid.h>
2717 #include <drm/drm_of.h>
2818 #include <drm/drm_panel.h>
29
-#include <drm/drmP.h>
19
+#include <drm/drm_print.h>
20
+#include <drm/drm_probe_helper.h>
3021 
3122 #define PTN3460_EDID_ADDR			0x0
3223 #define PTN3460_EDID_EMULATION_ADDR		0x84
....@@ -38,8 +29,7 @@
3829 	struct drm_connector connector;
3930 	struct i2c_client *client;
4031 	struct drm_bridge bridge;
41
-	struct edid *edid;
42
-	struct drm_panel *panel;
32
+	struct drm_bridge *panel_bridge;
4333 	struct gpio_desc *gpio_pd_n;
4434 	struct gpio_desc *gpio_rst_n;
4535 	u32 edid_emulation;
....@@ -136,11 +126,6 @@
136126 	usleep_range(10, 20);
137127 	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
138128 
139
-	if (drm_panel_prepare(ptn_bridge->panel)) {
140
-		DRM_ERROR("failed to prepare panel\n");
141
-		return;
142
-	}
143
-
144129 	/*
145130 	 * There's a bug in the PTN chip where it falsely asserts hotplug before
146131 	 * it is fully functional. We're forced to wait for the maximum start up
....@@ -155,16 +140,6 @@
155140 	ptn_bridge->enabled = true;
156141 }
157142 
158
-static void ptn3460_enable(struct drm_bridge *bridge)
159
-{
160
-	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
161
-
162
-	if (drm_panel_enable(ptn_bridge->panel)) {
163
-		DRM_ERROR("failed to enable panel\n");
164
-		return;
165
-	}
166
-}
167
-
168143 static void ptn3460_disable(struct drm_bridge *bridge)
169144 {
170145 	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
....@@ -174,36 +149,18 @@
174149 
175150 	ptn_bridge->enabled = false;
176151 
177
-	if (drm_panel_disable(ptn_bridge->panel)) {
178
-		DRM_ERROR("failed to disable panel\n");
179
-		return;
180
-	}
181
-
182152 	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
183153 	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
184154 }
185155 
186
-static void ptn3460_post_disable(struct drm_bridge *bridge)
156
+
157
+static struct edid *ptn3460_get_edid(struct drm_bridge *bridge,
158
+				     struct drm_connector *connector)
187159 {
188160 	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
189
-
190
-	if (drm_panel_unprepare(ptn_bridge->panel)) {
191
-		DRM_ERROR("failed to unprepare panel\n");
192
-		return;
193
-	}
194
-}
195
-
196
-static int ptn3460_get_modes(struct drm_connector *connector)
197
-{
198
-	struct ptn3460_bridge *ptn_bridge;
199
-	u8 *edid;
200
-	int ret, num_modes = 0;
201161 	bool power_off;
202
-
203
-	ptn_bridge = connector_to_ptn3460(connector);
204
-
205
-	if (ptn_bridge->edid)
206
-		return drm_add_edid_modes(connector, ptn_bridge->edid);
162
+	u8 *edid;
163
+	int ret;
207164 
208165 	power_off = !ptn_bridge->enabled;
209166 	ptn3460_pre_enable(&ptn_bridge->bridge);
....@@ -211,30 +168,40 @@
211168 	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
212169 	if (!edid) {
213170 		DRM_ERROR("Failed to allocate EDID\n");
214
-		return 0;
215
-	}
216
-
217
-	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
218
-			EDID_LENGTH);
219
-	if (ret) {
220
-		kfree(edid);
221171 		goto out;
222172 	}
223173 
224
-	ptn_bridge->edid = (struct edid *)edid;
225
-	drm_connector_update_edid_property(connector, ptn_bridge->edid);
226
-
227
-	num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
174
+	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
175
+				 EDID_LENGTH);
176
+	if (ret) {
177
+		kfree(edid);
178
+		edid = NULL;
179
+		goto out;
180
+	}
228181 
229182 out:
230183 	if (power_off)
231184 		ptn3460_disable(&ptn_bridge->bridge);
232185 
186
+	return (struct edid *)edid;
187
+}
188
+
189
+static int ptn3460_connector_get_modes(struct drm_connector *connector)
190
+{
191
+	struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
192
+	struct edid *edid;
193
+	int num_modes;
194
+
195
+	edid = ptn3460_get_edid(&ptn_bridge->bridge, connector);
196
+	drm_connector_update_edid_property(connector, edid);
197
+	num_modes = drm_add_edid_modes(connector, edid);
198
+	kfree(edid);
199
+
233200 	return num_modes;
234201 }
235202 
236203 static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
237
-	.get_modes = ptn3460_get_modes,
204
+	.get_modes = ptn3460_connector_get_modes,
238205 };
239206 
240207 static const struct drm_connector_funcs ptn3460_connector_funcs = {
....@@ -245,10 +212,20 @@
245212 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
246213 };
247214 
248
-static int ptn3460_bridge_attach(struct drm_bridge *bridge)
215
+static int ptn3460_bridge_attach(struct drm_bridge *bridge,
216
+				 enum drm_bridge_attach_flags flags)
249217 {
250218 	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
251219 	int ret;
220
+
221
+	/* Let this driver create connector if requested */
222
+	ret = drm_bridge_attach(bridge->encoder, ptn_bridge->panel_bridge,
223
+				bridge, flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR);
224
+	if (ret < 0)
225
+		return ret;
226
+
227
+	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
228
+		return 0;
252229 
253230 	if (!bridge->encoder) {
254231 		DRM_ERROR("Parent encoder object not found");
....@@ -268,9 +245,6 @@
268245 	drm_connector_attach_encoder(&ptn_bridge->connector,
269246 							bridge->encoder);
270247 
271
-	if (ptn_bridge->panel)
272
-		drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
273
-
274248 	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
275249 
276250 	return ret;
....@@ -278,10 +252,9 @@
278252 
279253 static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
280254 	.pre_enable = ptn3460_pre_enable,
281
-	.enable = ptn3460_enable,
282255 	.disable = ptn3460_disable,
283
-	.post_disable = ptn3460_post_disable,
284256 	.attach = ptn3460_bridge_attach,
257
+	.get_edid = ptn3460_get_edid,
285258 };
286259 
287260 static int ptn3460_probe(struct i2c_client *client,
....@@ -289,6 +262,8 @@
289262 {
290263 	struct device *dev = &client->dev;
291264 	struct ptn3460_bridge *ptn_bridge;
265
+	struct drm_bridge *panel_bridge;
266
+	struct drm_panel *panel;
292267 	int ret;
293268 
294269 	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
....@@ -296,10 +271,15 @@
296271 		return -ENOMEM;
297272 	}
298273 
299
-	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
274
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, NULL);
300275 	if (ret)
301276 		return ret;
302277 
278
+	panel_bridge = devm_drm_panel_bridge_add(dev, panel);
279
+	if (IS_ERR(panel_bridge))
280
+		return PTR_ERR(panel_bridge);
281
+
282
+	ptn_bridge->panel_bridge = panel_bridge;
303283 	ptn_bridge->client = client;
304284 
305285 	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
....@@ -330,6 +310,8 @@
330310 	}
331311 
332312 	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
313
+	ptn_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
314
+	ptn_bridge->bridge.type = DRM_MODE_CONNECTOR_LVDS;
333315 	ptn_bridge->bridge.of_node = dev->of_node;
334316 	drm_bridge_add(&ptn_bridge->bridge);
335317