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