xref: /openbmc/linux/drivers/gpu/drm/drm_connector.c (revision b58c6630)
1 /*
2  * Copyright (c) 2016 Intel Corporation
3  *
4  * Permission to use, copy, modify, distribute, and sell this software and its
5  * documentation for any purpose is hereby granted without fee, provided that
6  * the above copyright notice appear in all copies and that both that copyright
7  * notice and this permission notice appear in supporting documentation, and
8  * that the name of the copyright holders not be used in advertising or
9  * publicity pertaining to distribution of the software without specific,
10  * written prior permission.  The copyright holders make no representations
11  * about the suitability of this software for any purpose.  It is provided "as
12  * is" without express or implied warranty.
13  *
14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20  * OF THIS SOFTWARE.
21  */
22 
23 #include <drm/drm_connector.h>
24 #include <drm/drm_edid.h>
25 #include <drm/drm_encoder.h>
26 #include <drm/drm_utils.h>
27 #include <drm/drm_print.h>
28 #include <drm/drm_drv.h>
29 #include <drm/drm_file.h>
30 
31 #include <linux/uaccess.h>
32 
33 #include "drm_crtc_internal.h"
34 #include "drm_internal.h"
35 
36 /**
37  * DOC: overview
38  *
39  * In DRM connectors are the general abstraction for display sinks, and include
40  * als fixed panels or anything else that can display pixels in some form. As
41  * opposed to all other KMS objects representing hardware (like CRTC, encoder or
42  * plane abstractions) connectors can be hotplugged and unplugged at runtime.
43  * Hence they are reference-counted using drm_connector_get() and
44  * drm_connector_put().
45  *
46  * KMS driver must create, initialize, register and attach at a &struct
47  * drm_connector for each such sink. The instance is created as other KMS
48  * objects and initialized by setting the following fields. The connector is
49  * initialized with a call to drm_connector_init() with a pointer to the
50  * &struct drm_connector_funcs and a connector type, and then exposed to
51  * userspace with a call to drm_connector_register().
52  *
53  * Connectors must be attached to an encoder to be used. For devices that map
54  * connectors to encoders 1:1, the connector should be attached at
55  * initialization time with a call to drm_connector_attach_encoder(). The
56  * driver must also set the &drm_connector.encoder field to point to the
57  * attached encoder.
58  *
59  * For connectors which are not fixed (like built-in panels) the driver needs to
60  * support hotplug notifications. The simplest way to do that is by using the
61  * probe helpers, see drm_kms_helper_poll_init() for connectors which don't have
62  * hardware support for hotplug interrupts. Connectors with hardware hotplug
63  * support can instead use e.g. drm_helper_hpd_irq_event().
64  */
65 
66 struct drm_conn_prop_enum_list {
67 	int type;
68 	const char *name;
69 	struct ida ida;
70 };
71 
72 /*
73  * Connector and encoder types.
74  */
75 static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
76 	{ DRM_MODE_CONNECTOR_Unknown, "Unknown" },
77 	{ DRM_MODE_CONNECTOR_VGA, "VGA" },
78 	{ DRM_MODE_CONNECTOR_DVII, "DVI-I" },
79 	{ DRM_MODE_CONNECTOR_DVID, "DVI-D" },
80 	{ DRM_MODE_CONNECTOR_DVIA, "DVI-A" },
81 	{ DRM_MODE_CONNECTOR_Composite, "Composite" },
82 	{ DRM_MODE_CONNECTOR_SVIDEO, "SVIDEO" },
83 	{ DRM_MODE_CONNECTOR_LVDS, "LVDS" },
84 	{ DRM_MODE_CONNECTOR_Component, "Component" },
85 	{ DRM_MODE_CONNECTOR_9PinDIN, "DIN" },
86 	{ DRM_MODE_CONNECTOR_DisplayPort, "DP" },
87 	{ DRM_MODE_CONNECTOR_HDMIA, "HDMI-A" },
88 	{ DRM_MODE_CONNECTOR_HDMIB, "HDMI-B" },
89 	{ DRM_MODE_CONNECTOR_TV, "TV" },
90 	{ DRM_MODE_CONNECTOR_eDP, "eDP" },
91 	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
92 	{ DRM_MODE_CONNECTOR_DSI, "DSI" },
93 	{ DRM_MODE_CONNECTOR_DPI, "DPI" },
94 	{ DRM_MODE_CONNECTOR_WRITEBACK, "Writeback" },
95 	{ DRM_MODE_CONNECTOR_SPI, "SPI" },
96 };
97 
98 void drm_connector_ida_init(void)
99 {
100 	int i;
101 
102 	for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
103 		ida_init(&drm_connector_enum_list[i].ida);
104 }
105 
106 void drm_connector_ida_destroy(void)
107 {
108 	int i;
109 
110 	for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
111 		ida_destroy(&drm_connector_enum_list[i].ida);
112 }
113 
114 /**
115  * drm_get_connector_type_name - return a string for connector type
116  * @type: The connector type (DRM_MODE_CONNECTOR_*)
117  *
118  * Returns: the name of the connector type, or NULL if the type is not valid.
119  */
120 const char *drm_get_connector_type_name(unsigned int type)
121 {
122 	if (type < ARRAY_SIZE(drm_connector_enum_list))
123 		return drm_connector_enum_list[type].name;
124 
125 	return NULL;
126 }
127 EXPORT_SYMBOL(drm_get_connector_type_name);
128 
129 /**
130  * drm_connector_get_cmdline_mode - reads the user's cmdline mode
131  * @connector: connector to quwery
132  *
133  * The kernel supports per-connector configuration of its consoles through
134  * use of the video= parameter. This function parses that option and
135  * extracts the user's specified mode (or enable/disable status) for a
136  * particular connector. This is typically only used during the early fbdev
137  * setup.
138  */
139 static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
140 {
141 	struct drm_cmdline_mode *mode = &connector->cmdline_mode;
142 	char *option = NULL;
143 
144 	if (fb_get_options(connector->name, &option))
145 		return;
146 
147 	if (!drm_mode_parse_command_line_for_connector(option,
148 						       connector,
149 						       mode))
150 		return;
151 
152 	if (mode->force) {
153 		DRM_INFO("forcing %s connector %s\n", connector->name,
154 			 drm_get_connector_force_name(mode->force));
155 		connector->force = mode->force;
156 	}
157 
158 	if (mode->panel_orientation != DRM_MODE_PANEL_ORIENTATION_UNKNOWN) {
159 		DRM_INFO("cmdline forces connector %s panel_orientation to %d\n",
160 			 connector->name, mode->panel_orientation);
161 		drm_connector_set_panel_orientation(connector,
162 						    mode->panel_orientation);
163 	}
164 
165 	DRM_DEBUG_KMS("cmdline mode for connector %s %s %dx%d@%dHz%s%s%s\n",
166 		      connector->name, mode->name,
167 		      mode->xres, mode->yres,
168 		      mode->refresh_specified ? mode->refresh : 60,
169 		      mode->rb ? " reduced blanking" : "",
170 		      mode->margins ? " with margins" : "",
171 		      mode->interlace ?  " interlaced" : "");
172 }
173 
174 static void drm_connector_free(struct kref *kref)
175 {
176 	struct drm_connector *connector =
177 		container_of(kref, struct drm_connector, base.refcount);
178 	struct drm_device *dev = connector->dev;
179 
180 	drm_mode_object_unregister(dev, &connector->base);
181 	connector->funcs->destroy(connector);
182 }
183 
184 void drm_connector_free_work_fn(struct work_struct *work)
185 {
186 	struct drm_connector *connector, *n;
187 	struct drm_device *dev =
188 		container_of(work, struct drm_device, mode_config.connector_free_work);
189 	struct drm_mode_config *config = &dev->mode_config;
190 	unsigned long flags;
191 	struct llist_node *freed;
192 
193 	spin_lock_irqsave(&config->connector_list_lock, flags);
194 	freed = llist_del_all(&config->connector_free_list);
195 	spin_unlock_irqrestore(&config->connector_list_lock, flags);
196 
197 	llist_for_each_entry_safe(connector, n, freed, free_node) {
198 		drm_mode_object_unregister(dev, &connector->base);
199 		connector->funcs->destroy(connector);
200 	}
201 }
202 
203 /**
204  * drm_connector_init - Init a preallocated connector
205  * @dev: DRM device
206  * @connector: the connector to init
207  * @funcs: callbacks for this connector
208  * @connector_type: user visible type of the connector
209  *
210  * Initialises a preallocated connector. Connectors should be
211  * subclassed as part of driver connector objects.
212  *
213  * Returns:
214  * Zero on success, error code on failure.
215  */
216 int drm_connector_init(struct drm_device *dev,
217 		       struct drm_connector *connector,
218 		       const struct drm_connector_funcs *funcs,
219 		       int connector_type)
220 {
221 	struct drm_mode_config *config = &dev->mode_config;
222 	int ret;
223 	struct ida *connector_ida =
224 		&drm_connector_enum_list[connector_type].ida;
225 
226 	WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
227 		(!funcs->atomic_destroy_state ||
228 		 !funcs->atomic_duplicate_state));
229 
230 	ret = __drm_mode_object_add(dev, &connector->base,
231 				    DRM_MODE_OBJECT_CONNECTOR,
232 				    false, drm_connector_free);
233 	if (ret)
234 		return ret;
235 
236 	connector->base.properties = &connector->properties;
237 	connector->dev = dev;
238 	connector->funcs = funcs;
239 
240 	/* connector index is used with 32bit bitmasks */
241 	ret = ida_simple_get(&config->connector_ida, 0, 32, GFP_KERNEL);
242 	if (ret < 0) {
243 		DRM_DEBUG_KMS("Failed to allocate %s connector index: %d\n",
244 			      drm_connector_enum_list[connector_type].name,
245 			      ret);
246 		goto out_put;
247 	}
248 	connector->index = ret;
249 	ret = 0;
250 
251 	connector->connector_type = connector_type;
252 	connector->connector_type_id =
253 		ida_simple_get(connector_ida, 1, 0, GFP_KERNEL);
254 	if (connector->connector_type_id < 0) {
255 		ret = connector->connector_type_id;
256 		goto out_put_id;
257 	}
258 	connector->name =
259 		kasprintf(GFP_KERNEL, "%s-%d",
260 			  drm_connector_enum_list[connector_type].name,
261 			  connector->connector_type_id);
262 	if (!connector->name) {
263 		ret = -ENOMEM;
264 		goto out_put_type_id;
265 	}
266 
267 	INIT_LIST_HEAD(&connector->probed_modes);
268 	INIT_LIST_HEAD(&connector->modes);
269 	mutex_init(&connector->mutex);
270 	connector->edid_blob_ptr = NULL;
271 	connector->tile_blob_ptr = NULL;
272 	connector->status = connector_status_unknown;
273 	connector->display_info.panel_orientation =
274 		DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
275 
276 	drm_connector_get_cmdline_mode(connector);
277 
278 	/* We should add connectors at the end to avoid upsetting the connector
279 	 * index too much. */
280 	spin_lock_irq(&config->connector_list_lock);
281 	list_add_tail(&connector->head, &config->connector_list);
282 	config->num_connector++;
283 	spin_unlock_irq(&config->connector_list_lock);
284 
285 	if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL &&
286 	    connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
287 		drm_connector_attach_edid_property(connector);
288 
289 	drm_object_attach_property(&connector->base,
290 				      config->dpms_property, 0);
291 
292 	drm_object_attach_property(&connector->base,
293 				   config->link_status_property,
294 				   0);
295 
296 	drm_object_attach_property(&connector->base,
297 				   config->non_desktop_property,
298 				   0);
299 	drm_object_attach_property(&connector->base,
300 				   config->tile_property,
301 				   0);
302 
303 	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
304 		drm_object_attach_property(&connector->base, config->prop_crtc_id, 0);
305 	}
306 
307 	connector->debugfs_entry = NULL;
308 out_put_type_id:
309 	if (ret)
310 		ida_simple_remove(connector_ida, connector->connector_type_id);
311 out_put_id:
312 	if (ret)
313 		ida_simple_remove(&config->connector_ida, connector->index);
314 out_put:
315 	if (ret)
316 		drm_mode_object_unregister(dev, &connector->base);
317 
318 	return ret;
319 }
320 EXPORT_SYMBOL(drm_connector_init);
321 
322 /**
323  * drm_connector_init_with_ddc - Init a preallocated connector
324  * @dev: DRM device
325  * @connector: the connector to init
326  * @funcs: callbacks for this connector
327  * @connector_type: user visible type of the connector
328  * @ddc: pointer to the associated ddc adapter
329  *
330  * Initialises a preallocated connector. Connectors should be
331  * subclassed as part of driver connector objects.
332  *
333  * Ensures that the ddc field of the connector is correctly set.
334  *
335  * Returns:
336  * Zero on success, error code on failure.
337  */
338 int drm_connector_init_with_ddc(struct drm_device *dev,
339 				struct drm_connector *connector,
340 				const struct drm_connector_funcs *funcs,
341 				int connector_type,
342 				struct i2c_adapter *ddc)
343 {
344 	int ret;
345 
346 	ret = drm_connector_init(dev, connector, funcs, connector_type);
347 	if (ret)
348 		return ret;
349 
350 	/* provide ddc symlink in sysfs */
351 	connector->ddc = ddc;
352 
353 	return ret;
354 }
355 EXPORT_SYMBOL(drm_connector_init_with_ddc);
356 
357 /**
358  * drm_connector_attach_edid_property - attach edid property.
359  * @connector: the connector
360  *
361  * Some connector types like DRM_MODE_CONNECTOR_VIRTUAL do not get a
362  * edid property attached by default.  This function can be used to
363  * explicitly enable the edid property in these cases.
364  */
365 void drm_connector_attach_edid_property(struct drm_connector *connector)
366 {
367 	struct drm_mode_config *config = &connector->dev->mode_config;
368 
369 	drm_object_attach_property(&connector->base,
370 				   config->edid_property,
371 				   0);
372 }
373 EXPORT_SYMBOL(drm_connector_attach_edid_property);
374 
375 /**
376  * drm_connector_attach_encoder - attach a connector to an encoder
377  * @connector: connector to attach
378  * @encoder: encoder to attach @connector to
379  *
380  * This function links up a connector to an encoder. Note that the routing
381  * restrictions between encoders and crtcs are exposed to userspace through the
382  * possible_clones and possible_crtcs bitmasks.
383  *
384  * Returns:
385  * Zero on success, negative errno on failure.
386  */
387 int drm_connector_attach_encoder(struct drm_connector *connector,
388 				 struct drm_encoder *encoder)
389 {
390 	/*
391 	 * In the past, drivers have attempted to model the static association
392 	 * of connector to encoder in simple connector/encoder devices using a
393 	 * direct assignment of connector->encoder = encoder. This connection
394 	 * is a logical one and the responsibility of the core, so drivers are
395 	 * expected not to mess with this.
396 	 *
397 	 * Note that the error return should've been enough here, but a large
398 	 * majority of drivers ignores the return value, so add in a big WARN
399 	 * to get people's attention.
400 	 */
401 	if (WARN_ON(connector->encoder))
402 		return -EINVAL;
403 
404 	connector->possible_encoders |= drm_encoder_mask(encoder);
405 
406 	return 0;
407 }
408 EXPORT_SYMBOL(drm_connector_attach_encoder);
409 
410 /**
411  * drm_connector_has_possible_encoder - check if the connector and encoder are
412  * associated with each other
413  * @connector: the connector
414  * @encoder: the encoder
415  *
416  * Returns:
417  * True if @encoder is one of the possible encoders for @connector.
418  */
419 bool drm_connector_has_possible_encoder(struct drm_connector *connector,
420 					struct drm_encoder *encoder)
421 {
422 	return connector->possible_encoders & drm_encoder_mask(encoder);
423 }
424 EXPORT_SYMBOL(drm_connector_has_possible_encoder);
425 
426 static void drm_mode_remove(struct drm_connector *connector,
427 			    struct drm_display_mode *mode)
428 {
429 	list_del(&mode->head);
430 	drm_mode_destroy(connector->dev, mode);
431 }
432 
433 /**
434  * drm_connector_cleanup - cleans up an initialised connector
435  * @connector: connector to cleanup
436  *
437  * Cleans up the connector but doesn't free the object.
438  */
439 void drm_connector_cleanup(struct drm_connector *connector)
440 {
441 	struct drm_device *dev = connector->dev;
442 	struct drm_display_mode *mode, *t;
443 
444 	/* The connector should have been removed from userspace long before
445 	 * it is finally destroyed.
446 	 */
447 	if (WARN_ON(connector->registration_state ==
448 		    DRM_CONNECTOR_REGISTERED))
449 		drm_connector_unregister(connector);
450 
451 	if (connector->tile_group) {
452 		drm_mode_put_tile_group(dev, connector->tile_group);
453 		connector->tile_group = NULL;
454 	}
455 
456 	list_for_each_entry_safe(mode, t, &connector->probed_modes, head)
457 		drm_mode_remove(connector, mode);
458 
459 	list_for_each_entry_safe(mode, t, &connector->modes, head)
460 		drm_mode_remove(connector, mode);
461 
462 	ida_simple_remove(&drm_connector_enum_list[connector->connector_type].ida,
463 			  connector->connector_type_id);
464 
465 	ida_simple_remove(&dev->mode_config.connector_ida,
466 			  connector->index);
467 
468 	kfree(connector->display_info.bus_formats);
469 	drm_mode_object_unregister(dev, &connector->base);
470 	kfree(connector->name);
471 	connector->name = NULL;
472 	spin_lock_irq(&dev->mode_config.connector_list_lock);
473 	list_del(&connector->head);
474 	dev->mode_config.num_connector--;
475 	spin_unlock_irq(&dev->mode_config.connector_list_lock);
476 
477 	WARN_ON(connector->state && !connector->funcs->atomic_destroy_state);
478 	if (connector->state && connector->funcs->atomic_destroy_state)
479 		connector->funcs->atomic_destroy_state(connector,
480 						       connector->state);
481 
482 	mutex_destroy(&connector->mutex);
483 
484 	memset(connector, 0, sizeof(*connector));
485 }
486 EXPORT_SYMBOL(drm_connector_cleanup);
487 
488 /**
489  * drm_connector_register - register a connector
490  * @connector: the connector to register
491  *
492  * Register userspace interfaces for a connector. Only call this for connectors
493  * which can be hotplugged after drm_dev_register() has been called already,
494  * e.g. DP MST connectors. All other connectors will be registered automatically
495  * when calling drm_dev_register().
496  *
497  * Returns:
498  * Zero on success, error code on failure.
499  */
500 int drm_connector_register(struct drm_connector *connector)
501 {
502 	int ret = 0;
503 
504 	if (!connector->dev->registered)
505 		return 0;
506 
507 	mutex_lock(&connector->mutex);
508 	if (connector->registration_state != DRM_CONNECTOR_INITIALIZING)
509 		goto unlock;
510 
511 	ret = drm_sysfs_connector_add(connector);
512 	if (ret)
513 		goto unlock;
514 
515 	drm_debugfs_connector_add(connector);
516 
517 	if (connector->funcs->late_register) {
518 		ret = connector->funcs->late_register(connector);
519 		if (ret)
520 			goto err_debugfs;
521 	}
522 
523 	drm_mode_object_register(connector->dev, &connector->base);
524 
525 	connector->registration_state = DRM_CONNECTOR_REGISTERED;
526 	goto unlock;
527 
528 err_debugfs:
529 	drm_debugfs_connector_remove(connector);
530 	drm_sysfs_connector_remove(connector);
531 unlock:
532 	mutex_unlock(&connector->mutex);
533 	return ret;
534 }
535 EXPORT_SYMBOL(drm_connector_register);
536 
537 /**
538  * drm_connector_unregister - unregister a connector
539  * @connector: the connector to unregister
540  *
541  * Unregister userspace interfaces for a connector. Only call this for
542  * connectors which have registered explicitly by calling drm_dev_register(),
543  * since connectors are unregistered automatically when drm_dev_unregister() is
544  * called.
545  */
546 void drm_connector_unregister(struct drm_connector *connector)
547 {
548 	mutex_lock(&connector->mutex);
549 	if (connector->registration_state != DRM_CONNECTOR_REGISTERED) {
550 		mutex_unlock(&connector->mutex);
551 		return;
552 	}
553 
554 	if (connector->funcs->early_unregister)
555 		connector->funcs->early_unregister(connector);
556 
557 	drm_sysfs_connector_remove(connector);
558 	drm_debugfs_connector_remove(connector);
559 
560 	connector->registration_state = DRM_CONNECTOR_UNREGISTERED;
561 	mutex_unlock(&connector->mutex);
562 }
563 EXPORT_SYMBOL(drm_connector_unregister);
564 
565 void drm_connector_unregister_all(struct drm_device *dev)
566 {
567 	struct drm_connector *connector;
568 	struct drm_connector_list_iter conn_iter;
569 
570 	drm_connector_list_iter_begin(dev, &conn_iter);
571 	drm_for_each_connector_iter(connector, &conn_iter)
572 		drm_connector_unregister(connector);
573 	drm_connector_list_iter_end(&conn_iter);
574 }
575 
576 int drm_connector_register_all(struct drm_device *dev)
577 {
578 	struct drm_connector *connector;
579 	struct drm_connector_list_iter conn_iter;
580 	int ret = 0;
581 
582 	drm_connector_list_iter_begin(dev, &conn_iter);
583 	drm_for_each_connector_iter(connector, &conn_iter) {
584 		ret = drm_connector_register(connector);
585 		if (ret)
586 			break;
587 	}
588 	drm_connector_list_iter_end(&conn_iter);
589 
590 	if (ret)
591 		drm_connector_unregister_all(dev);
592 	return ret;
593 }
594 
595 /**
596  * drm_get_connector_status_name - return a string for connector status
597  * @status: connector status to compute name of
598  *
599  * In contrast to the other drm_get_*_name functions this one here returns a
600  * const pointer and hence is threadsafe.
601  */
602 const char *drm_get_connector_status_name(enum drm_connector_status status)
603 {
604 	if (status == connector_status_connected)
605 		return "connected";
606 	else if (status == connector_status_disconnected)
607 		return "disconnected";
608 	else
609 		return "unknown";
610 }
611 EXPORT_SYMBOL(drm_get_connector_status_name);
612 
613 /**
614  * drm_get_connector_force_name - return a string for connector force
615  * @force: connector force to get name of
616  *
617  * Returns: const pointer to name.
618  */
619 const char *drm_get_connector_force_name(enum drm_connector_force force)
620 {
621 	switch (force) {
622 	case DRM_FORCE_UNSPECIFIED:
623 		return "unspecified";
624 	case DRM_FORCE_OFF:
625 		return "off";
626 	case DRM_FORCE_ON:
627 		return "on";
628 	case DRM_FORCE_ON_DIGITAL:
629 		return "digital";
630 	default:
631 		return "unknown";
632 	}
633 }
634 
635 #ifdef CONFIG_LOCKDEP
636 static struct lockdep_map connector_list_iter_dep_map = {
637 	.name = "drm_connector_list_iter"
638 };
639 #endif
640 
641 /**
642  * drm_connector_list_iter_begin - initialize a connector_list iterator
643  * @dev: DRM device
644  * @iter: connector_list iterator
645  *
646  * Sets @iter up to walk the &drm_mode_config.connector_list of @dev. @iter
647  * must always be cleaned up again by calling drm_connector_list_iter_end().
648  * Iteration itself happens using drm_connector_list_iter_next() or
649  * drm_for_each_connector_iter().
650  */
651 void drm_connector_list_iter_begin(struct drm_device *dev,
652 				   struct drm_connector_list_iter *iter)
653 {
654 	iter->dev = dev;
655 	iter->conn = NULL;
656 	lock_acquire_shared_recursive(&connector_list_iter_dep_map, 0, 1, NULL, _RET_IP_);
657 }
658 EXPORT_SYMBOL(drm_connector_list_iter_begin);
659 
660 /*
661  * Extra-safe connector put function that works in any context. Should only be
662  * used from the connector_iter functions, where we never really expect to
663  * actually release the connector when dropping our final reference.
664  */
665 static void
666 __drm_connector_put_safe(struct drm_connector *conn)
667 {
668 	struct drm_mode_config *config = &conn->dev->mode_config;
669 
670 	lockdep_assert_held(&config->connector_list_lock);
671 
672 	if (!refcount_dec_and_test(&conn->base.refcount.refcount))
673 		return;
674 
675 	llist_add(&conn->free_node, &config->connector_free_list);
676 	schedule_work(&config->connector_free_work);
677 }
678 
679 /**
680  * drm_connector_list_iter_next - return next connector
681  * @iter: connector_list iterator
682  *
683  * Returns the next connector for @iter, or NULL when the list walk has
684  * completed.
685  */
686 struct drm_connector *
687 drm_connector_list_iter_next(struct drm_connector_list_iter *iter)
688 {
689 	struct drm_connector *old_conn = iter->conn;
690 	struct drm_mode_config *config = &iter->dev->mode_config;
691 	struct list_head *lhead;
692 	unsigned long flags;
693 
694 	spin_lock_irqsave(&config->connector_list_lock, flags);
695 	lhead = old_conn ? &old_conn->head : &config->connector_list;
696 
697 	do {
698 		if (lhead->next == &config->connector_list) {
699 			iter->conn = NULL;
700 			break;
701 		}
702 
703 		lhead = lhead->next;
704 		iter->conn = list_entry(lhead, struct drm_connector, head);
705 
706 		/* loop until it's not a zombie connector */
707 	} while (!kref_get_unless_zero(&iter->conn->base.refcount));
708 
709 	if (old_conn)
710 		__drm_connector_put_safe(old_conn);
711 	spin_unlock_irqrestore(&config->connector_list_lock, flags);
712 
713 	return iter->conn;
714 }
715 EXPORT_SYMBOL(drm_connector_list_iter_next);
716 
717 /**
718  * drm_connector_list_iter_end - tear down a connector_list iterator
719  * @iter: connector_list iterator
720  *
721  * Tears down @iter and releases any resources (like &drm_connector references)
722  * acquired while walking the list. This must always be called, both when the
723  * iteration completes fully or when it was aborted without walking the entire
724  * list.
725  */
726 void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
727 {
728 	struct drm_mode_config *config = &iter->dev->mode_config;
729 	unsigned long flags;
730 
731 	iter->dev = NULL;
732 	if (iter->conn) {
733 		spin_lock_irqsave(&config->connector_list_lock, flags);
734 		__drm_connector_put_safe(iter->conn);
735 		spin_unlock_irqrestore(&config->connector_list_lock, flags);
736 	}
737 	lock_release(&connector_list_iter_dep_map, _RET_IP_);
738 }
739 EXPORT_SYMBOL(drm_connector_list_iter_end);
740 
741 static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
742 	{ SubPixelUnknown, "Unknown" },
743 	{ SubPixelHorizontalRGB, "Horizontal RGB" },
744 	{ SubPixelHorizontalBGR, "Horizontal BGR" },
745 	{ SubPixelVerticalRGB, "Vertical RGB" },
746 	{ SubPixelVerticalBGR, "Vertical BGR" },
747 	{ SubPixelNone, "None" },
748 };
749 
750 /**
751  * drm_get_subpixel_order_name - return a string for a given subpixel enum
752  * @order: enum of subpixel_order
753  *
754  * Note you could abuse this and return something out of bounds, but that
755  * would be a caller error.  No unscrubbed user data should make it here.
756  */
757 const char *drm_get_subpixel_order_name(enum subpixel_order order)
758 {
759 	return drm_subpixel_enum_list[order].name;
760 }
761 EXPORT_SYMBOL(drm_get_subpixel_order_name);
762 
763 static const struct drm_prop_enum_list drm_dpms_enum_list[] = {
764 	{ DRM_MODE_DPMS_ON, "On" },
765 	{ DRM_MODE_DPMS_STANDBY, "Standby" },
766 	{ DRM_MODE_DPMS_SUSPEND, "Suspend" },
767 	{ DRM_MODE_DPMS_OFF, "Off" }
768 };
769 DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)
770 
771 static const struct drm_prop_enum_list drm_link_status_enum_list[] = {
772 	{ DRM_MODE_LINK_STATUS_GOOD, "Good" },
773 	{ DRM_MODE_LINK_STATUS_BAD, "Bad" },
774 };
775 
776 /**
777  * drm_display_info_set_bus_formats - set the supported bus formats
778  * @info: display info to store bus formats in
779  * @formats: array containing the supported bus formats
780  * @num_formats: the number of entries in the fmts array
781  *
782  * Store the supported bus formats in display info structure.
783  * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
784  * a full list of available formats.
785  */
786 int drm_display_info_set_bus_formats(struct drm_display_info *info,
787 				     const u32 *formats,
788 				     unsigned int num_formats)
789 {
790 	u32 *fmts = NULL;
791 
792 	if (!formats && num_formats)
793 		return -EINVAL;
794 
795 	if (formats && num_formats) {
796 		fmts = kmemdup(formats, sizeof(*formats) * num_formats,
797 			       GFP_KERNEL);
798 		if (!fmts)
799 			return -ENOMEM;
800 	}
801 
802 	kfree(info->bus_formats);
803 	info->bus_formats = fmts;
804 	info->num_bus_formats = num_formats;
805 
806 	return 0;
807 }
808 EXPORT_SYMBOL(drm_display_info_set_bus_formats);
809 
810 /* Optional connector properties. */
811 static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = {
812 	{ DRM_MODE_SCALE_NONE, "None" },
813 	{ DRM_MODE_SCALE_FULLSCREEN, "Full" },
814 	{ DRM_MODE_SCALE_CENTER, "Center" },
815 	{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
816 };
817 
818 static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
819 	{ DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
820 	{ DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
821 	{ DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
822 };
823 
824 static const struct drm_prop_enum_list drm_content_type_enum_list[] = {
825 	{ DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" },
826 	{ DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" },
827 	{ DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" },
828 	{ DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" },
829 	{ DRM_MODE_CONTENT_TYPE_GAME, "Game" },
830 };
831 
832 static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = {
833 	{ DRM_MODE_PANEL_ORIENTATION_NORMAL,	"Normal"	},
834 	{ DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP,	"Upside Down"	},
835 	{ DRM_MODE_PANEL_ORIENTATION_LEFT_UP,	"Left Side Up"	},
836 	{ DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,	"Right Side Up"	},
837 };
838 
839 static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = {
840 	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
841 	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
842 	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
843 };
844 DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)
845 
846 static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = {
847 	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
848 	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
849 	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
850 };
851 DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
852 		 drm_dvi_i_subconnector_enum_list)
853 
854 static const struct drm_prop_enum_list drm_tv_select_enum_list[] = {
855 	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
856 	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
857 	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
858 	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
859 	{ DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
860 };
861 DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)
862 
863 static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
864 	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
865 	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
866 	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
867 	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
868 	{ DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
869 };
870 DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
871 		 drm_tv_subconnector_enum_list)
872 
873 static const struct drm_prop_enum_list hdmi_colorspaces[] = {
874 	/* For Default case, driver will set the colorspace */
875 	{ DRM_MODE_COLORIMETRY_DEFAULT, "Default" },
876 	/* Standard Definition Colorimetry based on CEA 861 */
877 	{ DRM_MODE_COLORIMETRY_SMPTE_170M_YCC, "SMPTE_170M_YCC" },
878 	{ DRM_MODE_COLORIMETRY_BT709_YCC, "BT709_YCC" },
879 	/* Standard Definition Colorimetry based on IEC 61966-2-4 */
880 	{ DRM_MODE_COLORIMETRY_XVYCC_601, "XVYCC_601" },
881 	/* High Definition Colorimetry based on IEC 61966-2-4 */
882 	{ DRM_MODE_COLORIMETRY_XVYCC_709, "XVYCC_709" },
883 	/* Colorimetry based on IEC 61966-2-1/Amendment 1 */
884 	{ DRM_MODE_COLORIMETRY_SYCC_601, "SYCC_601" },
885 	/* Colorimetry based on IEC 61966-2-5 [33] */
886 	{ DRM_MODE_COLORIMETRY_OPYCC_601, "opYCC_601" },
887 	/* Colorimetry based on IEC 61966-2-5 */
888 	{ DRM_MODE_COLORIMETRY_OPRGB, "opRGB" },
889 	/* Colorimetry based on ITU-R BT.2020 */
890 	{ DRM_MODE_COLORIMETRY_BT2020_CYCC, "BT2020_CYCC" },
891 	/* Colorimetry based on ITU-R BT.2020 */
892 	{ DRM_MODE_COLORIMETRY_BT2020_RGB, "BT2020_RGB" },
893 	/* Colorimetry based on ITU-R BT.2020 */
894 	{ DRM_MODE_COLORIMETRY_BT2020_YCC, "BT2020_YCC" },
895 	/* Added as part of Additional Colorimetry Extension in 861.G */
896 	{ DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65, "DCI-P3_RGB_D65" },
897 	{ DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER, "DCI-P3_RGB_Theater" },
898 };
899 
900 /*
901  * As per DP 1.4a spec, 2.2.5.7.5 VSC SDP Payload for Pixel Encoding/Colorimetry
902  * Format Table 2-120
903  */
904 static const struct drm_prop_enum_list dp_colorspaces[] = {
905 	/* For Default case, driver will set the colorspace */
906 	{ DRM_MODE_COLORIMETRY_DEFAULT, "Default" },
907 	{ DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED, "RGB_Wide_Gamut_Fixed_Point" },
908 	/* Colorimetry based on scRGB (IEC 61966-2-2) */
909 	{ DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT, "RGB_Wide_Gamut_Floating_Point" },
910 	/* Colorimetry based on IEC 61966-2-5 */
911 	{ DRM_MODE_COLORIMETRY_OPRGB, "opRGB" },
912 	/* Colorimetry based on SMPTE RP 431-2 */
913 	{ DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65, "DCI-P3_RGB_D65" },
914 	/* Colorimetry based on ITU-R BT.2020 */
915 	{ DRM_MODE_COLORIMETRY_BT2020_RGB, "BT2020_RGB" },
916 	{ DRM_MODE_COLORIMETRY_BT601_YCC, "BT601_YCC" },
917 	{ DRM_MODE_COLORIMETRY_BT709_YCC, "BT709_YCC" },
918 	/* Standard Definition Colorimetry based on IEC 61966-2-4 */
919 	{ DRM_MODE_COLORIMETRY_XVYCC_601, "XVYCC_601" },
920 	/* High Definition Colorimetry based on IEC 61966-2-4 */
921 	{ DRM_MODE_COLORIMETRY_XVYCC_709, "XVYCC_709" },
922 	/* Colorimetry based on IEC 61966-2-1/Amendment 1 */
923 	{ DRM_MODE_COLORIMETRY_SYCC_601, "SYCC_601" },
924 	/* Colorimetry based on IEC 61966-2-5 [33] */
925 	{ DRM_MODE_COLORIMETRY_OPYCC_601, "opYCC_601" },
926 	/* Colorimetry based on ITU-R BT.2020 */
927 	{ DRM_MODE_COLORIMETRY_BT2020_CYCC, "BT2020_CYCC" },
928 	/* Colorimetry based on ITU-R BT.2020 */
929 	{ DRM_MODE_COLORIMETRY_BT2020_YCC, "BT2020_YCC" },
930 };
931 
932 /**
933  * DOC: standard connector properties
934  *
935  * DRM connectors have a few standardized properties:
936  *
937  * EDID:
938  * 	Blob property which contains the current EDID read from the sink. This
939  * 	is useful to parse sink identification information like vendor, model
940  * 	and serial. Drivers should update this property by calling
941  * 	drm_connector_update_edid_property(), usually after having parsed
942  * 	the EDID using drm_add_edid_modes(). Userspace cannot change this
943  * 	property.
944  * DPMS:
945  * 	Legacy property for setting the power state of the connector. For atomic
946  * 	drivers this is only provided for backwards compatibility with existing
947  * 	drivers, it remaps to controlling the "ACTIVE" property on the CRTC the
948  * 	connector is linked to. Drivers should never set this property directly,
949  * 	it is handled by the DRM core by calling the &drm_connector_funcs.dpms
950  * 	callback. For atomic drivers the remapping to the "ACTIVE" property is
951  * 	implemented in the DRM core.  This is the only standard connector
952  * 	property that userspace can change.
953  *
954  * 	Note that this property cannot be set through the MODE_ATOMIC ioctl,
955  * 	userspace must use "ACTIVE" on the CRTC instead.
956  *
957  * 	WARNING:
958  *
959  * 	For userspace also running on legacy drivers the "DPMS" semantics are a
960  * 	lot more complicated. First, userspace cannot rely on the "DPMS" value
961  * 	returned by the GETCONNECTOR actually reflecting reality, because many
962  * 	drivers fail to update it. For atomic drivers this is taken care of in
963  * 	drm_atomic_helper_update_legacy_modeset_state().
964  *
965  * 	The second issue is that the DPMS state is only well-defined when the
966  * 	connector is connected to a CRTC. In atomic the DRM core enforces that
967  * 	"ACTIVE" is off in such a case, no such checks exists for "DPMS".
968  *
969  * 	Finally, when enabling an output using the legacy SETCONFIG ioctl then
970  * 	"DPMS" is forced to ON. But see above, that might not be reflected in
971  * 	the software value on legacy drivers.
972  *
973  * 	Summarizing: Only set "DPMS" when the connector is known to be enabled,
974  * 	assume that a successful SETCONFIG call also sets "DPMS" to on, and
975  * 	never read back the value of "DPMS" because it can be incorrect.
976  * PATH:
977  * 	Connector path property to identify how this sink is physically
978  * 	connected. Used by DP MST. This should be set by calling
979  * 	drm_connector_set_path_property(), in the case of DP MST with the
980  * 	path property the MST manager created. Userspace cannot change this
981  * 	property.
982  * TILE:
983  * 	Connector tile group property to indicate how a set of DRM connector
984  * 	compose together into one logical screen. This is used by both high-res
985  * 	external screens (often only using a single cable, but exposing multiple
986  * 	DP MST sinks), or high-res integrated panels (like dual-link DSI) which
987  * 	are not gen-locked. Note that for tiled panels which are genlocked, like
988  * 	dual-link LVDS or dual-link DSI, the driver should try to not expose the
989  * 	tiling and virtualize both &drm_crtc and &drm_plane if needed. Drivers
990  * 	should update this value using drm_connector_set_tile_property().
991  * 	Userspace cannot change this property.
992  * link-status:
993  *      Connector link-status property to indicate the status of link. The
994  *      default value of link-status is "GOOD". If something fails during or
995  *      after modeset, the kernel driver may set this to "BAD" and issue a
996  *      hotplug uevent. Drivers should update this value using
997  *      drm_connector_set_link_status_property().
998  * non_desktop:
999  * 	Indicates the output should be ignored for purposes of displaying a
1000  * 	standard desktop environment or console. This is most likely because
1001  * 	the output device is not rectilinear.
1002  * Content Protection:
1003  *	This property is used by userspace to request the kernel protect future
1004  *	content communicated over the link. When requested, kernel will apply
1005  *	the appropriate means of protection (most often HDCP), and use the
1006  *	property to tell userspace the protection is active.
1007  *
1008  *	Drivers can set this up by calling
1009  *	drm_connector_attach_content_protection_property() on initialization.
1010  *
1011  *	The value of this property can be one of the following:
1012  *
1013  *	DRM_MODE_CONTENT_PROTECTION_UNDESIRED = 0
1014  *		The link is not protected, content is transmitted in the clear.
1015  *	DRM_MODE_CONTENT_PROTECTION_DESIRED = 1
1016  *		Userspace has requested content protection, but the link is not
1017  *		currently protected. When in this state, kernel should enable
1018  *		Content Protection as soon as possible.
1019  *	DRM_MODE_CONTENT_PROTECTION_ENABLED = 2
1020  *		Userspace has requested content protection, and the link is
1021  *		protected. Only the driver can set the property to this value.
1022  *		If userspace attempts to set to ENABLED, kernel will return
1023  *		-EINVAL.
1024  *
1025  *	A few guidelines:
1026  *
1027  *	- DESIRED state should be preserved until userspace de-asserts it by
1028  *	  setting the property to UNDESIRED. This means ENABLED should only
1029  *	  transition to UNDESIRED when the user explicitly requests it.
1030  *	- If the state is DESIRED, kernel should attempt to re-authenticate the
1031  *	  link whenever possible. This includes across disable/enable, dpms,
1032  *	  hotplug, downstream device changes, link status failures, etc..
1033  *	- Kernel sends uevent with the connector id and property id through
1034  *	  @drm_hdcp_update_content_protection, upon below kernel triggered
1035  *	  scenarios:
1036  *
1037  *		- DESIRED -> ENABLED (authentication success)
1038  *		- ENABLED -> DESIRED (termination of authentication)
1039  *	- Please note no uevents for userspace triggered property state changes,
1040  *	  which can't fail such as
1041  *
1042  *		- DESIRED/ENABLED -> UNDESIRED
1043  *		- UNDESIRED -> DESIRED
1044  *	- Userspace is responsible for polling the property or listen to uevents
1045  *	  to determine when the value transitions from ENABLED to DESIRED.
1046  *	  This signifies the link is no longer protected and userspace should
1047  *	  take appropriate action (whatever that might be).
1048  *
1049  * HDCP Content Type:
1050  *	This Enum property is used by the userspace to declare the content type
1051  *	of the display stream, to kernel. Here display stream stands for any
1052  *	display content that userspace intended to display through HDCP
1053  *	encryption.
1054  *
1055  *	Content Type of a stream is decided by the owner of the stream, as
1056  *	"HDCP Type0" or "HDCP Type1".
1057  *
1058  *	The value of the property can be one of the below:
1059  *	  - "HDCP Type0": DRM_MODE_HDCP_CONTENT_TYPE0 = 0
1060  *	  - "HDCP Type1": DRM_MODE_HDCP_CONTENT_TYPE1 = 1
1061  *
1062  *	When kernel starts the HDCP authentication (see "Content Protection"
1063  *	for details), it uses the content type in "HDCP Content Type"
1064  *	for performing the HDCP authentication with the display sink.
1065  *
1066  *	Please note in HDCP spec versions, a link can be authenticated with
1067  *	HDCP 2.2 for Content Type 0/Content Type 1. Where as a link can be
1068  *	authenticated with HDCP1.4 only for Content Type 0(though it is implicit
1069  *	in nature. As there is no reference for Content Type in HDCP1.4).
1070  *
1071  *	HDCP2.2 authentication protocol itself takes the "Content Type" as a
1072  *	parameter, which is a input for the DP HDCP2.2 encryption algo.
1073  *
1074  *	In case of Type 0 content protection request, kernel driver can choose
1075  *	either of HDCP spec versions 1.4 and 2.2. When HDCP2.2 is used for
1076  *	"HDCP Type 0", a HDCP 2.2 capable repeater in the downstream can send
1077  *	that content to a HDCP 1.4 authenticated HDCP sink (Type0 link).
1078  *	But if the content is classified as "HDCP Type 1", above mentioned
1079  *	HDCP 2.2 repeater wont send the content to the HDCP sink as it can't
1080  *	authenticate the HDCP1.4 capable sink for "HDCP Type 1".
1081  *
1082  *	Please note userspace can be ignorant of the HDCP versions used by the
1083  *	kernel driver to achieve the "HDCP Content Type".
1084  *
1085  *	At current scenario, classifying a content as Type 1 ensures that the
1086  *	content will be displayed only through the HDCP2.2 encrypted link.
1087  *
1088  *	Note that the HDCP Content Type property is introduced at HDCP 2.2, and
1089  *	defaults to type 0. It is only exposed by drivers supporting HDCP 2.2
1090  *	(hence supporting Type 0 and Type 1). Based on how next versions of
1091  *	HDCP specs are defined content Type could be used for higher versions
1092  *	too.
1093  *
1094  *	If content type is changed when "Content Protection" is not UNDESIRED,
1095  *	then kernel will disable the HDCP and re-enable with new type in the
1096  *	same atomic commit. And when "Content Protection" is ENABLED, it means
1097  *	that link is HDCP authenticated and encrypted, for the transmission of
1098  *	the Type of stream mentioned at "HDCP Content Type".
1099  *
1100  * HDR_OUTPUT_METADATA:
1101  *	Connector property to enable userspace to send HDR Metadata to
1102  *	driver. This metadata is based on the composition and blending
1103  *	policies decided by user, taking into account the hardware and
1104  *	sink capabilities. The driver gets this metadata and creates a
1105  *	Dynamic Range and Mastering Infoframe (DRM) in case of HDMI,
1106  *	SDP packet (Non-audio INFOFRAME SDP v1.3) for DP. This is then
1107  *	sent to sink. This notifies the sink of the upcoming frame's Color
1108  *	Encoding and Luminance parameters.
1109  *
1110  *	Userspace first need to detect the HDR capabilities of sink by
1111  *	reading and parsing the EDID. Details of HDR metadata for HDMI
1112  *	are added in CTA 861.G spec. For DP , its defined in VESA DP
1113  *	Standard v1.4. It needs to then get the metadata information
1114  *	of the video/game/app content which are encoded in HDR (basically
1115  *	using HDR transfer functions). With this information it needs to
1116  *	decide on a blending policy and compose the relevant
1117  *	layers/overlays into a common format. Once this blending is done,
1118  *	userspace will be aware of the metadata of the composed frame to
1119  *	be send to sink. It then uses this property to communicate this
1120  *	metadata to driver which then make a Infoframe packet and sends
1121  *	to sink based on the type of encoder connected.
1122  *
1123  *	Userspace will be responsible to do Tone mapping operation in case:
1124  *		- Some layers are HDR and others are SDR
1125  *		- HDR layers luminance is not same as sink
1126  *
1127  *	It will even need to do colorspace conversion and get all layers
1128  *	to one common colorspace for blending. It can use either GL, Media
1129  *	or display engine to get this done based on the capabilties of the
1130  *	associated hardware.
1131  *
1132  *	Driver expects metadata to be put in &struct hdr_output_metadata
1133  *	structure from userspace. This is received as blob and stored in
1134  *	&drm_connector_state.hdr_output_metadata. It parses EDID and saves the
1135  *	sink metadata in &struct hdr_sink_metadata, as
1136  *	&drm_connector.hdr_sink_metadata.  Driver uses
1137  *	drm_hdmi_infoframe_set_hdr_metadata() helper to set the HDR metadata,
1138  *	hdmi_drm_infoframe_pack() to pack the infoframe as per spec, in case of
1139  *	HDMI encoder.
1140  *
1141  * max bpc:
1142  *	This range property is used by userspace to limit the bit depth. When
1143  *	used the driver would limit the bpc in accordance with the valid range
1144  *	supported by the hardware and sink. Drivers to use the function
1145  *	drm_connector_attach_max_bpc_property() to create and attach the
1146  *	property to the connector during initialization.
1147  *
1148  * Connectors also have one standardized atomic property:
1149  *
1150  * CRTC_ID:
1151  * 	Mode object ID of the &drm_crtc this connector should be connected to.
1152  *
1153  * Connectors for LCD panels may also have one standardized property:
1154  *
1155  * panel orientation:
1156  *	On some devices the LCD panel is mounted in the casing in such a way
1157  *	that the up/top side of the panel does not match with the top side of
1158  *	the device. Userspace can use this property to check for this.
1159  *	Note that input coordinates from touchscreens (input devices with
1160  *	INPUT_PROP_DIRECT) will still map 1:1 to the actual LCD panel
1161  *	coordinates, so if userspace rotates the picture to adjust for
1162  *	the orientation it must also apply the same transformation to the
1163  *	touchscreen input coordinates. This property is initialized by calling
1164  *	drm_connector_set_panel_orientation() or
1165  *	drm_connector_set_panel_orientation_with_quirk()
1166  *
1167  * scaling mode:
1168  *	This property defines how a non-native mode is upscaled to the native
1169  *	mode of an LCD panel:
1170  *
1171  *	None:
1172  *		No upscaling happens, scaling is left to the panel. Not all
1173  *		drivers expose this mode.
1174  *	Full:
1175  *		The output is upscaled to the full resolution of the panel,
1176  *		ignoring the aspect ratio.
1177  *	Center:
1178  *		No upscaling happens, the output is centered within the native
1179  *		resolution the panel.
1180  *	Full aspect:
1181  *		The output is upscaled to maximize either the width or height
1182  *		while retaining the aspect ratio.
1183  *
1184  *	This property should be set up by calling
1185  *	drm_connector_attach_scaling_mode_property(). Note that drivers
1186  *	can also expose this property to external outputs, in which case they
1187  *	must support "None", which should be the default (since external screens
1188  *	have a built-in scaler).
1189  */
1190 
1191 int drm_connector_create_standard_properties(struct drm_device *dev)
1192 {
1193 	struct drm_property *prop;
1194 
1195 	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB |
1196 				   DRM_MODE_PROP_IMMUTABLE,
1197 				   "EDID", 0);
1198 	if (!prop)
1199 		return -ENOMEM;
1200 	dev->mode_config.edid_property = prop;
1201 
1202 	prop = drm_property_create_enum(dev, 0,
1203 				   "DPMS", drm_dpms_enum_list,
1204 				   ARRAY_SIZE(drm_dpms_enum_list));
1205 	if (!prop)
1206 		return -ENOMEM;
1207 	dev->mode_config.dpms_property = prop;
1208 
1209 	prop = drm_property_create(dev,
1210 				   DRM_MODE_PROP_BLOB |
1211 				   DRM_MODE_PROP_IMMUTABLE,
1212 				   "PATH", 0);
1213 	if (!prop)
1214 		return -ENOMEM;
1215 	dev->mode_config.path_property = prop;
1216 
1217 	prop = drm_property_create(dev,
1218 				   DRM_MODE_PROP_BLOB |
1219 				   DRM_MODE_PROP_IMMUTABLE,
1220 				   "TILE", 0);
1221 	if (!prop)
1222 		return -ENOMEM;
1223 	dev->mode_config.tile_property = prop;
1224 
1225 	prop = drm_property_create_enum(dev, 0, "link-status",
1226 					drm_link_status_enum_list,
1227 					ARRAY_SIZE(drm_link_status_enum_list));
1228 	if (!prop)
1229 		return -ENOMEM;
1230 	dev->mode_config.link_status_property = prop;
1231 
1232 	prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE, "non-desktop");
1233 	if (!prop)
1234 		return -ENOMEM;
1235 	dev->mode_config.non_desktop_property = prop;
1236 
1237 	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB,
1238 				   "HDR_OUTPUT_METADATA", 0);
1239 	if (!prop)
1240 		return -ENOMEM;
1241 	dev->mode_config.hdr_output_metadata_property = prop;
1242 
1243 	return 0;
1244 }
1245 
1246 /**
1247  * drm_mode_create_dvi_i_properties - create DVI-I specific connector properties
1248  * @dev: DRM device
1249  *
1250  * Called by a driver the first time a DVI-I connector is made.
1251  */
1252 int drm_mode_create_dvi_i_properties(struct drm_device *dev)
1253 {
1254 	struct drm_property *dvi_i_selector;
1255 	struct drm_property *dvi_i_subconnector;
1256 
1257 	if (dev->mode_config.dvi_i_select_subconnector_property)
1258 		return 0;
1259 
1260 	dvi_i_selector =
1261 		drm_property_create_enum(dev, 0,
1262 				    "select subconnector",
1263 				    drm_dvi_i_select_enum_list,
1264 				    ARRAY_SIZE(drm_dvi_i_select_enum_list));
1265 	dev->mode_config.dvi_i_select_subconnector_property = dvi_i_selector;
1266 
1267 	dvi_i_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
1268 				    "subconnector",
1269 				    drm_dvi_i_subconnector_enum_list,
1270 				    ARRAY_SIZE(drm_dvi_i_subconnector_enum_list));
1271 	dev->mode_config.dvi_i_subconnector_property = dvi_i_subconnector;
1272 
1273 	return 0;
1274 }
1275 EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);
1276 
1277 /**
1278  * DOC: HDMI connector properties
1279  *
1280  * content type (HDMI specific):
1281  *	Indicates content type setting to be used in HDMI infoframes to indicate
1282  *	content type for the external device, so that it adjusts its display
1283  *	settings accordingly.
1284  *
1285  *	The value of this property can be one of the following:
1286  *
1287  *	No Data:
1288  *		Content type is unknown
1289  *	Graphics:
1290  *		Content type is graphics
1291  *	Photo:
1292  *		Content type is photo
1293  *	Cinema:
1294  *		Content type is cinema
1295  *	Game:
1296  *		Content type is game
1297  *
1298  *	Drivers can set up this property by calling
1299  *	drm_connector_attach_content_type_property(). Decoding to
1300  *	infoframe values is done through drm_hdmi_avi_infoframe_content_type().
1301  */
1302 
1303 /**
1304  * drm_connector_attach_content_type_property - attach content-type property
1305  * @connector: connector to attach content type property on.
1306  *
1307  * Called by a driver the first time a HDMI connector is made.
1308  */
1309 int drm_connector_attach_content_type_property(struct drm_connector *connector)
1310 {
1311 	if (!drm_mode_create_content_type_property(connector->dev))
1312 		drm_object_attach_property(&connector->base,
1313 					   connector->dev->mode_config.content_type_property,
1314 					   DRM_MODE_CONTENT_TYPE_NO_DATA);
1315 	return 0;
1316 }
1317 EXPORT_SYMBOL(drm_connector_attach_content_type_property);
1318 
1319 
1320 /**
1321  * drm_hdmi_avi_infoframe_content_type() - fill the HDMI AVI infoframe
1322  *                                         content type information, based
1323  *                                         on correspondent DRM property.
1324  * @frame: HDMI AVI infoframe
1325  * @conn_state: DRM display connector state
1326  *
1327  */
1328 void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame,
1329 					 const struct drm_connector_state *conn_state)
1330 {
1331 	switch (conn_state->content_type) {
1332 	case DRM_MODE_CONTENT_TYPE_GRAPHICS:
1333 		frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS;
1334 		break;
1335 	case DRM_MODE_CONTENT_TYPE_CINEMA:
1336 		frame->content_type = HDMI_CONTENT_TYPE_CINEMA;
1337 		break;
1338 	case DRM_MODE_CONTENT_TYPE_GAME:
1339 		frame->content_type = HDMI_CONTENT_TYPE_GAME;
1340 		break;
1341 	case DRM_MODE_CONTENT_TYPE_PHOTO:
1342 		frame->content_type = HDMI_CONTENT_TYPE_PHOTO;
1343 		break;
1344 	default:
1345 		/* Graphics is the default(0) */
1346 		frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS;
1347 	}
1348 
1349 	frame->itc = conn_state->content_type != DRM_MODE_CONTENT_TYPE_NO_DATA;
1350 }
1351 EXPORT_SYMBOL(drm_hdmi_avi_infoframe_content_type);
1352 
1353 /**
1354  * drm_mode_attach_tv_margin_properties - attach TV connector margin properties
1355  * @connector: DRM connector
1356  *
1357  * Called by a driver when it needs to attach TV margin props to a connector.
1358  * Typically used on SDTV and HDMI connectors.
1359  */
1360 void drm_connector_attach_tv_margin_properties(struct drm_connector *connector)
1361 {
1362 	struct drm_device *dev = connector->dev;
1363 
1364 	drm_object_attach_property(&connector->base,
1365 				   dev->mode_config.tv_left_margin_property,
1366 				   0);
1367 	drm_object_attach_property(&connector->base,
1368 				   dev->mode_config.tv_right_margin_property,
1369 				   0);
1370 	drm_object_attach_property(&connector->base,
1371 				   dev->mode_config.tv_top_margin_property,
1372 				   0);
1373 	drm_object_attach_property(&connector->base,
1374 				   dev->mode_config.tv_bottom_margin_property,
1375 				   0);
1376 }
1377 EXPORT_SYMBOL(drm_connector_attach_tv_margin_properties);
1378 
1379 /**
1380  * drm_mode_create_tv_margin_properties - create TV connector margin properties
1381  * @dev: DRM device
1382  *
1383  * Called by a driver's HDMI connector initialization routine, this function
1384  * creates the TV margin properties for a given device. No need to call this
1385  * function for an SDTV connector, it's already called from
1386  * drm_mode_create_tv_properties().
1387  */
1388 int drm_mode_create_tv_margin_properties(struct drm_device *dev)
1389 {
1390 	if (dev->mode_config.tv_left_margin_property)
1391 		return 0;
1392 
1393 	dev->mode_config.tv_left_margin_property =
1394 		drm_property_create_range(dev, 0, "left margin", 0, 100);
1395 	if (!dev->mode_config.tv_left_margin_property)
1396 		return -ENOMEM;
1397 
1398 	dev->mode_config.tv_right_margin_property =
1399 		drm_property_create_range(dev, 0, "right margin", 0, 100);
1400 	if (!dev->mode_config.tv_right_margin_property)
1401 		return -ENOMEM;
1402 
1403 	dev->mode_config.tv_top_margin_property =
1404 		drm_property_create_range(dev, 0, "top margin", 0, 100);
1405 	if (!dev->mode_config.tv_top_margin_property)
1406 		return -ENOMEM;
1407 
1408 	dev->mode_config.tv_bottom_margin_property =
1409 		drm_property_create_range(dev, 0, "bottom margin", 0, 100);
1410 	if (!dev->mode_config.tv_bottom_margin_property)
1411 		return -ENOMEM;
1412 
1413 	return 0;
1414 }
1415 EXPORT_SYMBOL(drm_mode_create_tv_margin_properties);
1416 
1417 /**
1418  * drm_mode_create_tv_properties - create TV specific connector properties
1419  * @dev: DRM device
1420  * @num_modes: number of different TV formats (modes) supported
1421  * @modes: array of pointers to strings containing name of each format
1422  *
1423  * Called by a driver's TV initialization routine, this function creates
1424  * the TV specific connector properties for a given device.  Caller is
1425  * responsible for allocating a list of format names and passing them to
1426  * this routine.
1427  */
1428 int drm_mode_create_tv_properties(struct drm_device *dev,
1429 				  unsigned int num_modes,
1430 				  const char * const modes[])
1431 {
1432 	struct drm_property *tv_selector;
1433 	struct drm_property *tv_subconnector;
1434 	unsigned int i;
1435 
1436 	if (dev->mode_config.tv_select_subconnector_property)
1437 		return 0;
1438 
1439 	/*
1440 	 * Basic connector properties
1441 	 */
1442 	tv_selector = drm_property_create_enum(dev, 0,
1443 					  "select subconnector",
1444 					  drm_tv_select_enum_list,
1445 					  ARRAY_SIZE(drm_tv_select_enum_list));
1446 	if (!tv_selector)
1447 		goto nomem;
1448 
1449 	dev->mode_config.tv_select_subconnector_property = tv_selector;
1450 
1451 	tv_subconnector =
1452 		drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
1453 				    "subconnector",
1454 				    drm_tv_subconnector_enum_list,
1455 				    ARRAY_SIZE(drm_tv_subconnector_enum_list));
1456 	if (!tv_subconnector)
1457 		goto nomem;
1458 	dev->mode_config.tv_subconnector_property = tv_subconnector;
1459 
1460 	/*
1461 	 * Other, TV specific properties: margins & TV modes.
1462 	 */
1463 	if (drm_mode_create_tv_margin_properties(dev))
1464 		goto nomem;
1465 
1466 	dev->mode_config.tv_mode_property =
1467 		drm_property_create(dev, DRM_MODE_PROP_ENUM,
1468 				    "mode", num_modes);
1469 	if (!dev->mode_config.tv_mode_property)
1470 		goto nomem;
1471 
1472 	for (i = 0; i < num_modes; i++)
1473 		drm_property_add_enum(dev->mode_config.tv_mode_property,
1474 				      i, modes[i]);
1475 
1476 	dev->mode_config.tv_brightness_property =
1477 		drm_property_create_range(dev, 0, "brightness", 0, 100);
1478 	if (!dev->mode_config.tv_brightness_property)
1479 		goto nomem;
1480 
1481 	dev->mode_config.tv_contrast_property =
1482 		drm_property_create_range(dev, 0, "contrast", 0, 100);
1483 	if (!dev->mode_config.tv_contrast_property)
1484 		goto nomem;
1485 
1486 	dev->mode_config.tv_flicker_reduction_property =
1487 		drm_property_create_range(dev, 0, "flicker reduction", 0, 100);
1488 	if (!dev->mode_config.tv_flicker_reduction_property)
1489 		goto nomem;
1490 
1491 	dev->mode_config.tv_overscan_property =
1492 		drm_property_create_range(dev, 0, "overscan", 0, 100);
1493 	if (!dev->mode_config.tv_overscan_property)
1494 		goto nomem;
1495 
1496 	dev->mode_config.tv_saturation_property =
1497 		drm_property_create_range(dev, 0, "saturation", 0, 100);
1498 	if (!dev->mode_config.tv_saturation_property)
1499 		goto nomem;
1500 
1501 	dev->mode_config.tv_hue_property =
1502 		drm_property_create_range(dev, 0, "hue", 0, 100);
1503 	if (!dev->mode_config.tv_hue_property)
1504 		goto nomem;
1505 
1506 	return 0;
1507 nomem:
1508 	return -ENOMEM;
1509 }
1510 EXPORT_SYMBOL(drm_mode_create_tv_properties);
1511 
1512 /**
1513  * drm_mode_create_scaling_mode_property - create scaling mode property
1514  * @dev: DRM device
1515  *
1516  * Called by a driver the first time it's needed, must be attached to desired
1517  * connectors.
1518  *
1519  * Atomic drivers should use drm_connector_attach_scaling_mode_property()
1520  * instead to correctly assign &drm_connector_state.picture_aspect_ratio
1521  * in the atomic state.
1522  */
1523 int drm_mode_create_scaling_mode_property(struct drm_device *dev)
1524 {
1525 	struct drm_property *scaling_mode;
1526 
1527 	if (dev->mode_config.scaling_mode_property)
1528 		return 0;
1529 
1530 	scaling_mode =
1531 		drm_property_create_enum(dev, 0, "scaling mode",
1532 				drm_scaling_mode_enum_list,
1533 				    ARRAY_SIZE(drm_scaling_mode_enum_list));
1534 
1535 	dev->mode_config.scaling_mode_property = scaling_mode;
1536 
1537 	return 0;
1538 }
1539 EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
1540 
1541 /**
1542  * DOC: Variable refresh properties
1543  *
1544  * Variable refresh rate capable displays can dynamically adjust their
1545  * refresh rate by extending the duration of their vertical front porch
1546  * until page flip or timeout occurs. This can reduce or remove stuttering
1547  * and latency in scenarios where the page flip does not align with the
1548  * vblank interval.
1549  *
1550  * An example scenario would be an application flipping at a constant rate
1551  * of 48Hz on a 60Hz display. The page flip will frequently miss the vblank
1552  * interval and the same contents will be displayed twice. This can be
1553  * observed as stuttering for content with motion.
1554  *
1555  * If variable refresh rate was active on a display that supported a
1556  * variable refresh range from 35Hz to 60Hz no stuttering would be observable
1557  * for the example scenario. The minimum supported variable refresh rate of
1558  * 35Hz is below the page flip frequency and the vertical front porch can
1559  * be extended until the page flip occurs. The vblank interval will be
1560  * directly aligned to the page flip rate.
1561  *
1562  * Not all userspace content is suitable for use with variable refresh rate.
1563  * Large and frequent changes in vertical front porch duration may worsen
1564  * perceived stuttering for input sensitive applications.
1565  *
1566  * Panel brightness will also vary with vertical front porch duration. Some
1567  * panels may have noticeable differences in brightness between the minimum
1568  * vertical front porch duration and the maximum vertical front porch duration.
1569  * Large and frequent changes in vertical front porch duration may produce
1570  * observable flickering for such panels.
1571  *
1572  * Userspace control for variable refresh rate is supported via properties
1573  * on the &drm_connector and &drm_crtc objects.
1574  *
1575  * "vrr_capable":
1576  *	Optional &drm_connector boolean property that drivers should attach
1577  *	with drm_connector_attach_vrr_capable_property() on connectors that
1578  *	could support variable refresh rates. Drivers should update the
1579  *	property value by calling drm_connector_set_vrr_capable_property().
1580  *
1581  *	Absence of the property should indicate absence of support.
1582  *
1583  * "VRR_ENABLED":
1584  *	Default &drm_crtc boolean property that notifies the driver that the
1585  *	content on the CRTC is suitable for variable refresh rate presentation.
1586  *	The driver will take this property as a hint to enable variable
1587  *	refresh rate support if the receiver supports it, ie. if the
1588  *	"vrr_capable" property is true on the &drm_connector object. The
1589  *	vertical front porch duration will be extended until page-flip or
1590  *	timeout when enabled.
1591  *
1592  *	The minimum vertical front porch duration is defined as the vertical
1593  *	front porch duration for the current mode.
1594  *
1595  *	The maximum vertical front porch duration is greater than or equal to
1596  *	the minimum vertical front porch duration. The duration is derived
1597  *	from the minimum supported variable refresh rate for the connector.
1598  *
1599  *	The driver may place further restrictions within these minimum
1600  *	and maximum bounds.
1601  */
1602 
1603 /**
1604  * drm_connector_attach_vrr_capable_property - creates the
1605  * vrr_capable property
1606  * @connector: connector to create the vrr_capable property on.
1607  *
1608  * This is used by atomic drivers to add support for querying
1609  * variable refresh rate capability for a connector.
1610  *
1611  * Returns:
1612  * Zero on success, negative errono on failure.
1613  */
1614 int drm_connector_attach_vrr_capable_property(
1615 	struct drm_connector *connector)
1616 {
1617 	struct drm_device *dev = connector->dev;
1618 	struct drm_property *prop;
1619 
1620 	if (!connector->vrr_capable_property) {
1621 		prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE,
1622 			"vrr_capable");
1623 		if (!prop)
1624 			return -ENOMEM;
1625 
1626 		connector->vrr_capable_property = prop;
1627 		drm_object_attach_property(&connector->base, prop, 0);
1628 	}
1629 
1630 	return 0;
1631 }
1632 EXPORT_SYMBOL(drm_connector_attach_vrr_capable_property);
1633 
1634 /**
1635  * drm_connector_attach_scaling_mode_property - attach atomic scaling mode property
1636  * @connector: connector to attach scaling mode property on.
1637  * @scaling_mode_mask: or'ed mask of BIT(%DRM_MODE_SCALE_\*).
1638  *
1639  * This is used to add support for scaling mode to atomic drivers.
1640  * The scaling mode will be set to &drm_connector_state.picture_aspect_ratio
1641  * and can be used from &drm_connector_helper_funcs->atomic_check for validation.
1642  *
1643  * This is the atomic version of drm_mode_create_scaling_mode_property().
1644  *
1645  * Returns:
1646  * Zero on success, negative errno on failure.
1647  */
1648 int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
1649 					       u32 scaling_mode_mask)
1650 {
1651 	struct drm_device *dev = connector->dev;
1652 	struct drm_property *scaling_mode_property;
1653 	int i;
1654 	const unsigned valid_scaling_mode_mask =
1655 		(1U << ARRAY_SIZE(drm_scaling_mode_enum_list)) - 1;
1656 
1657 	if (WARN_ON(hweight32(scaling_mode_mask) < 2 ||
1658 		    scaling_mode_mask & ~valid_scaling_mode_mask))
1659 		return -EINVAL;
1660 
1661 	scaling_mode_property =
1662 		drm_property_create(dev, DRM_MODE_PROP_ENUM, "scaling mode",
1663 				    hweight32(scaling_mode_mask));
1664 
1665 	if (!scaling_mode_property)
1666 		return -ENOMEM;
1667 
1668 	for (i = 0; i < ARRAY_SIZE(drm_scaling_mode_enum_list); i++) {
1669 		int ret;
1670 
1671 		if (!(BIT(i) & scaling_mode_mask))
1672 			continue;
1673 
1674 		ret = drm_property_add_enum(scaling_mode_property,
1675 					    drm_scaling_mode_enum_list[i].type,
1676 					    drm_scaling_mode_enum_list[i].name);
1677 
1678 		if (ret) {
1679 			drm_property_destroy(dev, scaling_mode_property);
1680 
1681 			return ret;
1682 		}
1683 	}
1684 
1685 	drm_object_attach_property(&connector->base,
1686 				   scaling_mode_property, 0);
1687 
1688 	connector->scaling_mode_property = scaling_mode_property;
1689 
1690 	return 0;
1691 }
1692 EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property);
1693 
1694 /**
1695  * drm_mode_create_aspect_ratio_property - create aspect ratio property
1696  * @dev: DRM device
1697  *
1698  * Called by a driver the first time it's needed, must be attached to desired
1699  * connectors.
1700  *
1701  * Returns:
1702  * Zero on success, negative errno on failure.
1703  */
1704 int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
1705 {
1706 	if (dev->mode_config.aspect_ratio_property)
1707 		return 0;
1708 
1709 	dev->mode_config.aspect_ratio_property =
1710 		drm_property_create_enum(dev, 0, "aspect ratio",
1711 				drm_aspect_ratio_enum_list,
1712 				ARRAY_SIZE(drm_aspect_ratio_enum_list));
1713 
1714 	if (dev->mode_config.aspect_ratio_property == NULL)
1715 		return -ENOMEM;
1716 
1717 	return 0;
1718 }
1719 EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);
1720 
1721 /**
1722  * DOC: standard connector properties
1723  *
1724  * Colorspace:
1725  *     This property helps select a suitable colorspace based on the sink
1726  *     capability. Modern sink devices support wider gamut like BT2020.
1727  *     This helps switch to BT2020 mode if the BT2020 encoded video stream
1728  *     is being played by the user, same for any other colorspace. Thereby
1729  *     giving a good visual experience to users.
1730  *
1731  *     The expectation from userspace is that it should parse the EDID
1732  *     and get supported colorspaces. Use this property and switch to the
1733  *     one supported. Sink supported colorspaces should be retrieved by
1734  *     userspace from EDID and driver will not explicitly expose them.
1735  *
1736  *     Basically the expectation from userspace is:
1737  *      - Set up CRTC DEGAMMA/CTM/GAMMA to convert to some sink
1738  *        colorspace
1739  *      - Set this new property to let the sink know what it
1740  *        converted the CRTC output to.
1741  *      - This property is just to inform sink what colorspace
1742  *        source is trying to drive.
1743  *
1744  * Because between HDMI and DP have different colorspaces,
1745  * drm_mode_create_hdmi_colorspace_property() is used for HDMI connector and
1746  * drm_mode_create_dp_colorspace_property() is used for DP connector.
1747  */
1748 
1749 /**
1750  * drm_mode_create_hdmi_colorspace_property - create hdmi colorspace property
1751  * @connector: connector to create the Colorspace property on.
1752  *
1753  * Called by a driver the first time it's needed, must be attached to desired
1754  * HDMI connectors.
1755  *
1756  * Returns:
1757  * Zero on success, negative errono on failure.
1758  */
1759 int drm_mode_create_hdmi_colorspace_property(struct drm_connector *connector)
1760 {
1761 	struct drm_device *dev = connector->dev;
1762 
1763 	if (connector->colorspace_property)
1764 		return 0;
1765 
1766 	connector->colorspace_property =
1767 		drm_property_create_enum(dev, DRM_MODE_PROP_ENUM, "Colorspace",
1768 					 hdmi_colorspaces,
1769 					 ARRAY_SIZE(hdmi_colorspaces));
1770 
1771 	if (!connector->colorspace_property)
1772 		return -ENOMEM;
1773 
1774 	return 0;
1775 }
1776 EXPORT_SYMBOL(drm_mode_create_hdmi_colorspace_property);
1777 
1778 /**
1779  * drm_mode_create_dp_colorspace_property - create dp colorspace property
1780  * @connector: connector to create the Colorspace property on.
1781  *
1782  * Called by a driver the first time it's needed, must be attached to desired
1783  * DP connectors.
1784  *
1785  * Returns:
1786  * Zero on success, negative errono on failure.
1787  */
1788 int drm_mode_create_dp_colorspace_property(struct drm_connector *connector)
1789 {
1790 	struct drm_device *dev = connector->dev;
1791 
1792 	if (connector->colorspace_property)
1793 		return 0;
1794 
1795 	connector->colorspace_property =
1796 		drm_property_create_enum(dev, DRM_MODE_PROP_ENUM, "Colorspace",
1797 					 dp_colorspaces,
1798 					 ARRAY_SIZE(dp_colorspaces));
1799 
1800 	if (!connector->colorspace_property)
1801 		return -ENOMEM;
1802 
1803 	return 0;
1804 }
1805 EXPORT_SYMBOL(drm_mode_create_dp_colorspace_property);
1806 
1807 /**
1808  * drm_mode_create_content_type_property - create content type property
1809  * @dev: DRM device
1810  *
1811  * Called by a driver the first time it's needed, must be attached to desired
1812  * connectors.
1813  *
1814  * Returns:
1815  * Zero on success, negative errno on failure.
1816  */
1817 int drm_mode_create_content_type_property(struct drm_device *dev)
1818 {
1819 	if (dev->mode_config.content_type_property)
1820 		return 0;
1821 
1822 	dev->mode_config.content_type_property =
1823 		drm_property_create_enum(dev, 0, "content type",
1824 					 drm_content_type_enum_list,
1825 					 ARRAY_SIZE(drm_content_type_enum_list));
1826 
1827 	if (dev->mode_config.content_type_property == NULL)
1828 		return -ENOMEM;
1829 
1830 	return 0;
1831 }
1832 EXPORT_SYMBOL(drm_mode_create_content_type_property);
1833 
1834 /**
1835  * drm_mode_create_suggested_offset_properties - create suggests offset properties
1836  * @dev: DRM device
1837  *
1838  * Create the the suggested x/y offset property for connectors.
1839  */
1840 int drm_mode_create_suggested_offset_properties(struct drm_device *dev)
1841 {
1842 	if (dev->mode_config.suggested_x_property && dev->mode_config.suggested_y_property)
1843 		return 0;
1844 
1845 	dev->mode_config.suggested_x_property =
1846 		drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested X", 0, 0xffffffff);
1847 
1848 	dev->mode_config.suggested_y_property =
1849 		drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested Y", 0, 0xffffffff);
1850 
1851 	if (dev->mode_config.suggested_x_property == NULL ||
1852 	    dev->mode_config.suggested_y_property == NULL)
1853 		return -ENOMEM;
1854 	return 0;
1855 }
1856 EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties);
1857 
1858 /**
1859  * drm_connector_set_path_property - set tile property on connector
1860  * @connector: connector to set property on.
1861  * @path: path to use for property; must not be NULL.
1862  *
1863  * This creates a property to expose to userspace to specify a
1864  * connector path. This is mainly used for DisplayPort MST where
1865  * connectors have a topology and we want to allow userspace to give
1866  * them more meaningful names.
1867  *
1868  * Returns:
1869  * Zero on success, negative errno on failure.
1870  */
1871 int drm_connector_set_path_property(struct drm_connector *connector,
1872 				    const char *path)
1873 {
1874 	struct drm_device *dev = connector->dev;
1875 	int ret;
1876 
1877 	ret = drm_property_replace_global_blob(dev,
1878 	                                       &connector->path_blob_ptr,
1879 	                                       strlen(path) + 1,
1880 	                                       path,
1881 	                                       &connector->base,
1882 	                                       dev->mode_config.path_property);
1883 	return ret;
1884 }
1885 EXPORT_SYMBOL(drm_connector_set_path_property);
1886 
1887 /**
1888  * drm_connector_set_tile_property - set tile property on connector
1889  * @connector: connector to set property on.
1890  *
1891  * This looks up the tile information for a connector, and creates a
1892  * property for userspace to parse if it exists. The property is of
1893  * the form of 8 integers using ':' as a separator.
1894  * This is used for dual port tiled displays with DisplayPort SST
1895  * or DisplayPort MST connectors.
1896  *
1897  * Returns:
1898  * Zero on success, errno on failure.
1899  */
1900 int drm_connector_set_tile_property(struct drm_connector *connector)
1901 {
1902 	struct drm_device *dev = connector->dev;
1903 	char tile[256];
1904 	int ret;
1905 
1906 	if (!connector->has_tile) {
1907 		ret  = drm_property_replace_global_blob(dev,
1908 		                                        &connector->tile_blob_ptr,
1909 		                                        0,
1910 		                                        NULL,
1911 		                                        &connector->base,
1912 		                                        dev->mode_config.tile_property);
1913 		return ret;
1914 	}
1915 
1916 	snprintf(tile, 256, "%d:%d:%d:%d:%d:%d:%d:%d",
1917 		 connector->tile_group->id, connector->tile_is_single_monitor,
1918 		 connector->num_h_tile, connector->num_v_tile,
1919 		 connector->tile_h_loc, connector->tile_v_loc,
1920 		 connector->tile_h_size, connector->tile_v_size);
1921 
1922 	ret = drm_property_replace_global_blob(dev,
1923 	                                       &connector->tile_blob_ptr,
1924 	                                       strlen(tile) + 1,
1925 	                                       tile,
1926 	                                       &connector->base,
1927 	                                       dev->mode_config.tile_property);
1928 	return ret;
1929 }
1930 EXPORT_SYMBOL(drm_connector_set_tile_property);
1931 
1932 /**
1933  * drm_connector_update_edid_property - update the edid property of a connector
1934  * @connector: drm connector
1935  * @edid: new value of the edid property
1936  *
1937  * This function creates a new blob modeset object and assigns its id to the
1938  * connector's edid property.
1939  * Since we also parse tile information from EDID's displayID block, we also
1940  * set the connector's tile property here. See drm_connector_set_tile_property()
1941  * for more details.
1942  *
1943  * Returns:
1944  * Zero on success, negative errno on failure.
1945  */
1946 int drm_connector_update_edid_property(struct drm_connector *connector,
1947 				       const struct edid *edid)
1948 {
1949 	struct drm_device *dev = connector->dev;
1950 	size_t size = 0;
1951 	int ret;
1952 
1953 	/* ignore requests to set edid when overridden */
1954 	if (connector->override_edid)
1955 		return 0;
1956 
1957 	if (edid)
1958 		size = EDID_LENGTH * (1 + edid->extensions);
1959 
1960 	/* Set the display info, using edid if available, otherwise
1961 	 * reseting the values to defaults. This duplicates the work
1962 	 * done in drm_add_edid_modes, but that function is not
1963 	 * consistently called before this one in all drivers and the
1964 	 * computation is cheap enough that it seems better to
1965 	 * duplicate it rather than attempt to ensure some arbitrary
1966 	 * ordering of calls.
1967 	 */
1968 	if (edid)
1969 		drm_add_display_info(connector, edid);
1970 	else
1971 		drm_reset_display_info(connector);
1972 
1973 	drm_object_property_set_value(&connector->base,
1974 				      dev->mode_config.non_desktop_property,
1975 				      connector->display_info.non_desktop);
1976 
1977 	ret = drm_property_replace_global_blob(dev,
1978 					       &connector->edid_blob_ptr,
1979 	                                       size,
1980 	                                       edid,
1981 	                                       &connector->base,
1982 	                                       dev->mode_config.edid_property);
1983 	if (ret)
1984 		return ret;
1985 	return drm_connector_set_tile_property(connector);
1986 }
1987 EXPORT_SYMBOL(drm_connector_update_edid_property);
1988 
1989 /**
1990  * drm_connector_set_link_status_property - Set link status property of a connector
1991  * @connector: drm connector
1992  * @link_status: new value of link status property (0: Good, 1: Bad)
1993  *
1994  * In usual working scenario, this link status property will always be set to
1995  * "GOOD". If something fails during or after a mode set, the kernel driver
1996  * may set this link status property to "BAD". The caller then needs to send a
1997  * hotplug uevent for userspace to re-check the valid modes through
1998  * GET_CONNECTOR_IOCTL and retry modeset.
1999  *
2000  * Note: Drivers cannot rely on userspace to support this property and
2001  * issue a modeset. As such, they may choose to handle issues (like
2002  * re-training a link) without userspace's intervention.
2003  *
2004  * The reason for adding this property is to handle link training failures, but
2005  * it is not limited to DP or link training. For example, if we implement
2006  * asynchronous setcrtc, this property can be used to report any failures in that.
2007  */
2008 void drm_connector_set_link_status_property(struct drm_connector *connector,
2009 					    uint64_t link_status)
2010 {
2011 	struct drm_device *dev = connector->dev;
2012 
2013 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
2014 	connector->state->link_status = link_status;
2015 	drm_modeset_unlock(&dev->mode_config.connection_mutex);
2016 }
2017 EXPORT_SYMBOL(drm_connector_set_link_status_property);
2018 
2019 /**
2020  * drm_connector_attach_max_bpc_property - attach "max bpc" property
2021  * @connector: connector to attach max bpc property on.
2022  * @min: The minimum bit depth supported by the connector.
2023  * @max: The maximum bit depth supported by the connector.
2024  *
2025  * This is used to add support for limiting the bit depth on a connector.
2026  *
2027  * Returns:
2028  * Zero on success, negative errno on failure.
2029  */
2030 int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
2031 					  int min, int max)
2032 {
2033 	struct drm_device *dev = connector->dev;
2034 	struct drm_property *prop;
2035 
2036 	prop = connector->max_bpc_property;
2037 	if (!prop) {
2038 		prop = drm_property_create_range(dev, 0, "max bpc", min, max);
2039 		if (!prop)
2040 			return -ENOMEM;
2041 
2042 		connector->max_bpc_property = prop;
2043 	}
2044 
2045 	drm_object_attach_property(&connector->base, prop, max);
2046 	connector->state->max_requested_bpc = max;
2047 	connector->state->max_bpc = max;
2048 
2049 	return 0;
2050 }
2051 EXPORT_SYMBOL(drm_connector_attach_max_bpc_property);
2052 
2053 /**
2054  * drm_connector_set_vrr_capable_property - sets the variable refresh rate
2055  * capable property for a connector
2056  * @connector: drm connector
2057  * @capable: True if the connector is variable refresh rate capable
2058  *
2059  * Should be used by atomic drivers to update the indicated support for
2060  * variable refresh rate over a connector.
2061  */
2062 void drm_connector_set_vrr_capable_property(
2063 		struct drm_connector *connector, bool capable)
2064 {
2065 	drm_object_property_set_value(&connector->base,
2066 				      connector->vrr_capable_property,
2067 				      capable);
2068 }
2069 EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
2070 
2071 /**
2072  * drm_connector_set_panel_orientation - sets the connecter's panel_orientation
2073  * @connector: connector for which to set the panel-orientation property.
2074  * @panel_orientation: drm_panel_orientation value to set
2075  *
2076  * This function sets the connector's panel_orientation and attaches
2077  * a "panel orientation" property to the connector.
2078  *
2079  * Calling this function on a connector where the panel_orientation has
2080  * already been set is a no-op (e.g. the orientation has been overridden with
2081  * a kernel commandline option).
2082  *
2083  * It is allowed to call this function with a panel_orientation of
2084  * DRM_MODE_PANEL_ORIENTATION_UNKNOWN, in which case it is a no-op.
2085  *
2086  * Returns:
2087  * Zero on success, negative errno on failure.
2088  */
2089 int drm_connector_set_panel_orientation(
2090 	struct drm_connector *connector,
2091 	enum drm_panel_orientation panel_orientation)
2092 {
2093 	struct drm_device *dev = connector->dev;
2094 	struct drm_display_info *info = &connector->display_info;
2095 	struct drm_property *prop;
2096 
2097 	/* Already set? */
2098 	if (info->panel_orientation != DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
2099 		return 0;
2100 
2101 	/* Don't attach the property if the orientation is unknown */
2102 	if (panel_orientation == DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
2103 		return 0;
2104 
2105 	info->panel_orientation = panel_orientation;
2106 
2107 	prop = dev->mode_config.panel_orientation_property;
2108 	if (!prop) {
2109 		prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
2110 				"panel orientation",
2111 				drm_panel_orientation_enum_list,
2112 				ARRAY_SIZE(drm_panel_orientation_enum_list));
2113 		if (!prop)
2114 			return -ENOMEM;
2115 
2116 		dev->mode_config.panel_orientation_property = prop;
2117 	}
2118 
2119 	drm_object_attach_property(&connector->base, prop,
2120 				   info->panel_orientation);
2121 	return 0;
2122 }
2123 EXPORT_SYMBOL(drm_connector_set_panel_orientation);
2124 
2125 /**
2126  * drm_connector_set_panel_orientation_with_quirk -
2127  *	set the connecter's panel_orientation after checking for quirks
2128  * @connector: connector for which to init the panel-orientation property.
2129  * @panel_orientation: drm_panel_orientation value to set
2130  * @width: width in pixels of the panel, used for panel quirk detection
2131  * @height: height in pixels of the panel, used for panel quirk detection
2132  *
2133  * Like drm_connector_set_panel_orientation(), but with a check for platform
2134  * specific (e.g. DMI based) quirks overriding the passed in panel_orientation.
2135  *
2136  * Returns:
2137  * Zero on success, negative errno on failure.
2138  */
2139 int drm_connector_set_panel_orientation_with_quirk(
2140 	struct drm_connector *connector,
2141 	enum drm_panel_orientation panel_orientation,
2142 	int width, int height)
2143 {
2144 	int orientation_quirk;
2145 
2146 	orientation_quirk = drm_get_panel_orientation_quirk(width, height);
2147 	if (orientation_quirk != DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
2148 		panel_orientation = orientation_quirk;
2149 
2150 	return drm_connector_set_panel_orientation(connector,
2151 						   panel_orientation);
2152 }
2153 EXPORT_SYMBOL(drm_connector_set_panel_orientation_with_quirk);
2154 
2155 int drm_connector_set_obj_prop(struct drm_mode_object *obj,
2156 				    struct drm_property *property,
2157 				    uint64_t value)
2158 {
2159 	int ret = -EINVAL;
2160 	struct drm_connector *connector = obj_to_connector(obj);
2161 
2162 	/* Do DPMS ourselves */
2163 	if (property == connector->dev->mode_config.dpms_property) {
2164 		ret = (*connector->funcs->dpms)(connector, (int)value);
2165 	} else if (connector->funcs->set_property)
2166 		ret = connector->funcs->set_property(connector, property, value);
2167 
2168 	if (!ret)
2169 		drm_object_property_set_value(&connector->base, property, value);
2170 	return ret;
2171 }
2172 
2173 int drm_connector_property_set_ioctl(struct drm_device *dev,
2174 				     void *data, struct drm_file *file_priv)
2175 {
2176 	struct drm_mode_connector_set_property *conn_set_prop = data;
2177 	struct drm_mode_obj_set_property obj_set_prop = {
2178 		.value = conn_set_prop->value,
2179 		.prop_id = conn_set_prop->prop_id,
2180 		.obj_id = conn_set_prop->connector_id,
2181 		.obj_type = DRM_MODE_OBJECT_CONNECTOR
2182 	};
2183 
2184 	/* It does all the locking and checking we need */
2185 	return drm_mode_obj_set_property_ioctl(dev, &obj_set_prop, file_priv);
2186 }
2187 
2188 static struct drm_encoder *drm_connector_get_encoder(struct drm_connector *connector)
2189 {
2190 	/* For atomic drivers only state objects are synchronously updated and
2191 	 * protected by modeset locks, so check those first. */
2192 	if (connector->state)
2193 		return connector->state->best_encoder;
2194 	return connector->encoder;
2195 }
2196 
2197 static bool
2198 drm_mode_expose_to_userspace(const struct drm_display_mode *mode,
2199 			     const struct list_head *export_list,
2200 			     const struct drm_file *file_priv)
2201 {
2202 	/*
2203 	 * If user-space hasn't configured the driver to expose the stereo 3D
2204 	 * modes, don't expose them.
2205 	 */
2206 	if (!file_priv->stereo_allowed && drm_mode_is_stereo(mode))
2207 		return false;
2208 	/*
2209 	 * If user-space hasn't configured the driver to expose the modes
2210 	 * with aspect-ratio, don't expose them. However if such a mode
2211 	 * is unique, let it be exposed, but reset the aspect-ratio flags
2212 	 * while preparing the list of user-modes.
2213 	 */
2214 	if (!file_priv->aspect_ratio_allowed) {
2215 		struct drm_display_mode *mode_itr;
2216 
2217 		list_for_each_entry(mode_itr, export_list, export_head)
2218 			if (drm_mode_match(mode_itr, mode,
2219 					   DRM_MODE_MATCH_TIMINGS |
2220 					   DRM_MODE_MATCH_CLOCK |
2221 					   DRM_MODE_MATCH_FLAGS |
2222 					   DRM_MODE_MATCH_3D_FLAGS))
2223 				return false;
2224 	}
2225 
2226 	return true;
2227 }
2228 
2229 int drm_mode_getconnector(struct drm_device *dev, void *data,
2230 			  struct drm_file *file_priv)
2231 {
2232 	struct drm_mode_get_connector *out_resp = data;
2233 	struct drm_connector *connector;
2234 	struct drm_encoder *encoder;
2235 	struct drm_display_mode *mode;
2236 	int mode_count = 0;
2237 	int encoders_count = 0;
2238 	int ret = 0;
2239 	int copied = 0;
2240 	struct drm_mode_modeinfo u_mode;
2241 	struct drm_mode_modeinfo __user *mode_ptr;
2242 	uint32_t __user *encoder_ptr;
2243 	LIST_HEAD(export_list);
2244 
2245 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
2246 		return -EOPNOTSUPP;
2247 
2248 	memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));
2249 
2250 	connector = drm_connector_lookup(dev, file_priv, out_resp->connector_id);
2251 	if (!connector)
2252 		return -ENOENT;
2253 
2254 	encoders_count = hweight32(connector->possible_encoders);
2255 
2256 	if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
2257 		copied = 0;
2258 		encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
2259 
2260 		drm_connector_for_each_possible_encoder(connector, encoder) {
2261 			if (put_user(encoder->base.id, encoder_ptr + copied)) {
2262 				ret = -EFAULT;
2263 				goto out;
2264 			}
2265 			copied++;
2266 		}
2267 	}
2268 	out_resp->count_encoders = encoders_count;
2269 
2270 	out_resp->connector_id = connector->base.id;
2271 	out_resp->connector_type = connector->connector_type;
2272 	out_resp->connector_type_id = connector->connector_type_id;
2273 
2274 	mutex_lock(&dev->mode_config.mutex);
2275 	if (out_resp->count_modes == 0) {
2276 		connector->funcs->fill_modes(connector,
2277 					     dev->mode_config.max_width,
2278 					     dev->mode_config.max_height);
2279 	}
2280 
2281 	out_resp->mm_width = connector->display_info.width_mm;
2282 	out_resp->mm_height = connector->display_info.height_mm;
2283 	out_resp->subpixel = connector->display_info.subpixel_order;
2284 	out_resp->connection = connector->status;
2285 
2286 	/* delayed so we get modes regardless of pre-fill_modes state */
2287 	list_for_each_entry(mode, &connector->modes, head)
2288 		if (drm_mode_expose_to_userspace(mode, &export_list,
2289 						 file_priv)) {
2290 			list_add_tail(&mode->export_head, &export_list);
2291 			mode_count++;
2292 		}
2293 
2294 	/*
2295 	 * This ioctl is called twice, once to determine how much space is
2296 	 * needed, and the 2nd time to fill it.
2297 	 * The modes that need to be exposed to the user are maintained in the
2298 	 * 'export_list'. When the ioctl is called first time to determine the,
2299 	 * space, the export_list gets filled, to find the no.of modes. In the
2300 	 * 2nd time, the user modes are filled, one by one from the export_list.
2301 	 */
2302 	if ((out_resp->count_modes >= mode_count) && mode_count) {
2303 		copied = 0;
2304 		mode_ptr = (struct drm_mode_modeinfo __user *)(unsigned long)out_resp->modes_ptr;
2305 		list_for_each_entry(mode, &export_list, export_head) {
2306 			drm_mode_convert_to_umode(&u_mode, mode);
2307 			/*
2308 			 * Reset aspect ratio flags of user-mode, if modes with
2309 			 * aspect-ratio are not supported.
2310 			 */
2311 			if (!file_priv->aspect_ratio_allowed)
2312 				u_mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2313 			if (copy_to_user(mode_ptr + copied,
2314 					 &u_mode, sizeof(u_mode))) {
2315 				ret = -EFAULT;
2316 				mutex_unlock(&dev->mode_config.mutex);
2317 
2318 				goto out;
2319 			}
2320 			copied++;
2321 		}
2322 	}
2323 	out_resp->count_modes = mode_count;
2324 	mutex_unlock(&dev->mode_config.mutex);
2325 
2326 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
2327 	encoder = drm_connector_get_encoder(connector);
2328 	if (encoder)
2329 		out_resp->encoder_id = encoder->base.id;
2330 	else
2331 		out_resp->encoder_id = 0;
2332 
2333 	/* Only grab properties after probing, to make sure EDID and other
2334 	 * properties reflect the latest status. */
2335 	ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
2336 			(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
2337 			(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
2338 			&out_resp->count_props);
2339 	drm_modeset_unlock(&dev->mode_config.connection_mutex);
2340 
2341 out:
2342 	drm_connector_put(connector);
2343 
2344 	return ret;
2345 }
2346 
2347 
2348 /**
2349  * DOC: Tile group
2350  *
2351  * Tile groups are used to represent tiled monitors with a unique integer
2352  * identifier. Tiled monitors using DisplayID v1.3 have a unique 8-byte handle,
2353  * we store this in a tile group, so we have a common identifier for all tiles
2354  * in a monitor group. The property is called "TILE". Drivers can manage tile
2355  * groups using drm_mode_create_tile_group(), drm_mode_put_tile_group() and
2356  * drm_mode_get_tile_group(). But this is only needed for internal panels where
2357  * the tile group information is exposed through a non-standard way.
2358  */
2359 
2360 static void drm_tile_group_free(struct kref *kref)
2361 {
2362 	struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount);
2363 	struct drm_device *dev = tg->dev;
2364 	mutex_lock(&dev->mode_config.idr_mutex);
2365 	idr_remove(&dev->mode_config.tile_idr, tg->id);
2366 	mutex_unlock(&dev->mode_config.idr_mutex);
2367 	kfree(tg);
2368 }
2369 
2370 /**
2371  * drm_mode_put_tile_group - drop a reference to a tile group.
2372  * @dev: DRM device
2373  * @tg: tile group to drop reference to.
2374  *
2375  * drop reference to tile group and free if 0.
2376  */
2377 void drm_mode_put_tile_group(struct drm_device *dev,
2378 			     struct drm_tile_group *tg)
2379 {
2380 	kref_put(&tg->refcount, drm_tile_group_free);
2381 }
2382 EXPORT_SYMBOL(drm_mode_put_tile_group);
2383 
2384 /**
2385  * drm_mode_get_tile_group - get a reference to an existing tile group
2386  * @dev: DRM device
2387  * @topology: 8-bytes unique per monitor.
2388  *
2389  * Use the unique bytes to get a reference to an existing tile group.
2390  *
2391  * RETURNS:
2392  * tile group or NULL if not found.
2393  */
2394 struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
2395 					       char topology[8])
2396 {
2397 	struct drm_tile_group *tg;
2398 	int id;
2399 	mutex_lock(&dev->mode_config.idr_mutex);
2400 	idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) {
2401 		if (!memcmp(tg->group_data, topology, 8)) {
2402 			if (!kref_get_unless_zero(&tg->refcount))
2403 				tg = NULL;
2404 			mutex_unlock(&dev->mode_config.idr_mutex);
2405 			return tg;
2406 		}
2407 	}
2408 	mutex_unlock(&dev->mode_config.idr_mutex);
2409 	return NULL;
2410 }
2411 EXPORT_SYMBOL(drm_mode_get_tile_group);
2412 
2413 /**
2414  * drm_mode_create_tile_group - create a tile group from a displayid description
2415  * @dev: DRM device
2416  * @topology: 8-bytes unique per monitor.
2417  *
2418  * Create a tile group for the unique monitor, and get a unique
2419  * identifier for the tile group.
2420  *
2421  * RETURNS:
2422  * new tile group or NULL.
2423  */
2424 struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
2425 						  char topology[8])
2426 {
2427 	struct drm_tile_group *tg;
2428 	int ret;
2429 
2430 	tg = kzalloc(sizeof(*tg), GFP_KERNEL);
2431 	if (!tg)
2432 		return NULL;
2433 
2434 	kref_init(&tg->refcount);
2435 	memcpy(tg->group_data, topology, 8);
2436 	tg->dev = dev;
2437 
2438 	mutex_lock(&dev->mode_config.idr_mutex);
2439 	ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL);
2440 	if (ret >= 0) {
2441 		tg->id = ret;
2442 	} else {
2443 		kfree(tg);
2444 		tg = NULL;
2445 	}
2446 
2447 	mutex_unlock(&dev->mode_config.idr_mutex);
2448 	return tg;
2449 }
2450 EXPORT_SYMBOL(drm_mode_create_tile_group);
2451