2 * Copyright (c) 2016 Intel Corporation
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.
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
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>
31 #include <linux/uaccess.h>
33 #include "drm_crtc_internal.h"
34 #include "drm_internal.h"
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().
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().
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
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().
66 struct drm_conn_prop_enum_list {
73 * Connector and encoder types.
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" },
97 void drm_connector_ida_init(void)
101 for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
102 ida_init(&drm_connector_enum_list[i].ida);
105 void drm_connector_ida_destroy(void)
109 for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
110 ida_destroy(&drm_connector_enum_list[i].ida);
114 * drm_connector_get_cmdline_mode - reads the user's cmdline mode
115 * @connector: connector to quwery
117 * The kernel supports per-connector configuration of its consoles through
118 * use of the video= parameter. This function parses that option and
119 * extracts the user's specified mode (or enable/disable status) for a
120 * particular connector. This is typically only used during the early fbdev
123 static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
125 struct drm_cmdline_mode *mode = &connector->cmdline_mode;
128 if (fb_get_options(connector->name, &option))
131 if (!drm_mode_parse_command_line_for_connector(option,
137 DRM_INFO("forcing %s connector %s\n", connector->name,
138 drm_get_connector_force_name(mode->force));
139 connector->force = mode->force;
142 DRM_DEBUG_KMS("cmdline mode for connector %s %s %dx%d@%dHz%s%s%s\n",
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" : "");
152 static void drm_connector_free(struct kref *kref)
154 struct drm_connector *connector =
155 container_of(kref, struct drm_connector, base.refcount);
156 struct drm_device *dev = connector->dev;
158 drm_mode_object_unregister(dev, &connector->base);
159 connector->funcs->destroy(connector);
162 void drm_connector_free_work_fn(struct work_struct *work)
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;
169 struct llist_node *freed;
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);
175 llist_for_each_entry_safe(connector, n, freed, free_node) {
176 drm_mode_object_unregister(dev, &connector->base);
177 connector->funcs->destroy(connector);
182 * drm_connector_init - Init a preallocated connector
184 * @connector: the connector to init
185 * @funcs: callbacks for this connector
186 * @connector_type: user visible type of the connector
188 * Initialises a preallocated connector. Connectors should be
189 * subclassed as part of driver connector objects.
192 * Zero on success, error code on failure.
194 int drm_connector_init(struct drm_device *dev,
195 struct drm_connector *connector,
196 const struct drm_connector_funcs *funcs,
199 struct drm_mode_config *config = &dev->mode_config;
201 struct ida *connector_ida =
202 &drm_connector_enum_list[connector_type].ida;
204 WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
205 (!funcs->atomic_destroy_state ||
206 !funcs->atomic_duplicate_state));
208 ret = __drm_mode_object_add(dev, &connector->base,
209 DRM_MODE_OBJECT_CONNECTOR,
210 false, drm_connector_free);
214 connector->base.properties = &connector->properties;
215 connector->dev = dev;
216 connector->funcs = funcs;
218 /* connector index is used with 32bit bitmasks */
219 ret = ida_simple_get(&config->connector_ida, 0, 32, GFP_KERNEL);
221 DRM_DEBUG_KMS("Failed to allocate %s connector index: %d\n",
222 drm_connector_enum_list[connector_type].name,
226 connector->index = ret;
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;
237 kasprintf(GFP_KERNEL, "%s-%d",
238 drm_connector_enum_list[connector_type].name,
239 connector->connector_type_id);
240 if (!connector->name) {
242 goto out_put_type_id;
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;
254 drm_connector_get_cmdline_mode(connector);
256 /* We should add connectors at the end to avoid upsetting the connector
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);
263 if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL &&
264 connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
265 drm_connector_attach_edid_property(connector);
267 drm_object_attach_property(&connector->base,
268 config->dpms_property, 0);
270 drm_object_attach_property(&connector->base,
271 config->link_status_property,
274 drm_object_attach_property(&connector->base,
275 config->non_desktop_property,
277 drm_object_attach_property(&connector->base,
278 config->tile_property,
281 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
282 drm_object_attach_property(&connector->base, config->prop_crtc_id, 0);
285 connector->debugfs_entry = NULL;
288 ida_simple_remove(connector_ida, connector->connector_type_id);
291 ida_simple_remove(&config->connector_ida, connector->index);
294 drm_mode_object_unregister(dev, &connector->base);
298 EXPORT_SYMBOL(drm_connector_init);
301 * drm_connector_attach_edid_property - attach edid property.
302 * @connector: the connector
304 * Some connector types like DRM_MODE_CONNECTOR_VIRTUAL do not get a
305 * edid property attached by default. This function can be used to
306 * explicitly enable the edid property in these cases.
308 void drm_connector_attach_edid_property(struct drm_connector *connector)
310 struct drm_mode_config *config = &connector->dev->mode_config;
312 drm_object_attach_property(&connector->base,
313 config->edid_property,
316 EXPORT_SYMBOL(drm_connector_attach_edid_property);
319 * drm_connector_attach_encoder - attach a connector to an encoder
320 * @connector: connector to attach
321 * @encoder: encoder to attach @connector to
323 * This function links up a connector to an encoder. Note that the routing
324 * restrictions between encoders and crtcs are exposed to userspace through the
325 * possible_clones and possible_crtcs bitmasks.
328 * Zero on success, negative errno on failure.
330 int drm_connector_attach_encoder(struct drm_connector *connector,
331 struct drm_encoder *encoder)
336 * In the past, drivers have attempted to model the static association
337 * of connector to encoder in simple connector/encoder devices using a
338 * direct assignment of connector->encoder = encoder. This connection
339 * is a logical one and the responsibility of the core, so drivers are
340 * expected not to mess with this.
342 * Note that the error return should've been enough here, but a large
343 * majority of drivers ignores the return value, so add in a big WARN
344 * to get people's attention.
346 if (WARN_ON(connector->encoder))
349 for (i = 0; i < ARRAY_SIZE(connector->encoder_ids); i++) {
350 if (connector->encoder_ids[i] == 0) {
351 connector->encoder_ids[i] = encoder->base.id;
357 EXPORT_SYMBOL(drm_connector_attach_encoder);
360 * drm_connector_has_possible_encoder - check if the connector and encoder are assosicated with each other
361 * @connector: the connector
362 * @encoder: the encoder
365 * True if @encoder is one of the possible encoders for @connector.
367 bool drm_connector_has_possible_encoder(struct drm_connector *connector,
368 struct drm_encoder *encoder)
370 struct drm_encoder *enc;
373 drm_connector_for_each_possible_encoder(connector, enc, i) {
380 EXPORT_SYMBOL(drm_connector_has_possible_encoder);
382 static void drm_mode_remove(struct drm_connector *connector,
383 struct drm_display_mode *mode)
385 list_del(&mode->head);
386 drm_mode_destroy(connector->dev, mode);
390 * drm_connector_cleanup - cleans up an initialised connector
391 * @connector: connector to cleanup
393 * Cleans up the connector but doesn't free the object.
395 void drm_connector_cleanup(struct drm_connector *connector)
397 struct drm_device *dev = connector->dev;
398 struct drm_display_mode *mode, *t;
400 /* The connector should have been removed from userspace long before
401 * it is finally destroyed.
403 if (WARN_ON(connector->registration_state ==
404 DRM_CONNECTOR_REGISTERED))
405 drm_connector_unregister(connector);
407 if (connector->tile_group) {
408 drm_mode_put_tile_group(dev, connector->tile_group);
409 connector->tile_group = NULL;
412 list_for_each_entry_safe(mode, t, &connector->probed_modes, head)
413 drm_mode_remove(connector, mode);
415 list_for_each_entry_safe(mode, t, &connector->modes, head)
416 drm_mode_remove(connector, mode);
418 ida_simple_remove(&drm_connector_enum_list[connector->connector_type].ida,
419 connector->connector_type_id);
421 ida_simple_remove(&dev->mode_config.connector_ida,
424 kfree(connector->display_info.bus_formats);
425 drm_mode_object_unregister(dev, &connector->base);
426 kfree(connector->name);
427 connector->name = NULL;
428 spin_lock_irq(&dev->mode_config.connector_list_lock);
429 list_del(&connector->head);
430 dev->mode_config.num_connector--;
431 spin_unlock_irq(&dev->mode_config.connector_list_lock);
433 WARN_ON(connector->state && !connector->funcs->atomic_destroy_state);
434 if (connector->state && connector->funcs->atomic_destroy_state)
435 connector->funcs->atomic_destroy_state(connector,
438 mutex_destroy(&connector->mutex);
440 memset(connector, 0, sizeof(*connector));
442 EXPORT_SYMBOL(drm_connector_cleanup);
445 * drm_connector_register - register a connector
446 * @connector: the connector to register
448 * Register userspace interfaces for a connector
451 * Zero on success, error code on failure.
453 int drm_connector_register(struct drm_connector *connector)
457 if (!connector->dev->registered)
460 mutex_lock(&connector->mutex);
461 if (connector->registration_state != DRM_CONNECTOR_INITIALIZING)
464 ret = drm_sysfs_connector_add(connector);
468 drm_debugfs_connector_add(connector);
470 if (connector->funcs->late_register) {
471 ret = connector->funcs->late_register(connector);
476 drm_mode_object_register(connector->dev, &connector->base);
478 connector->registration_state = DRM_CONNECTOR_REGISTERED;
482 drm_debugfs_connector_remove(connector);
483 drm_sysfs_connector_remove(connector);
485 mutex_unlock(&connector->mutex);
488 EXPORT_SYMBOL(drm_connector_register);
491 * drm_connector_unregister - unregister a connector
492 * @connector: the connector to unregister
494 * Unregister userspace interfaces for a connector
496 void drm_connector_unregister(struct drm_connector *connector)
498 mutex_lock(&connector->mutex);
499 if (connector->registration_state != DRM_CONNECTOR_REGISTERED) {
500 mutex_unlock(&connector->mutex);
504 if (connector->funcs->early_unregister)
505 connector->funcs->early_unregister(connector);
507 drm_sysfs_connector_remove(connector);
508 drm_debugfs_connector_remove(connector);
510 connector->registration_state = DRM_CONNECTOR_UNREGISTERED;
511 mutex_unlock(&connector->mutex);
513 EXPORT_SYMBOL(drm_connector_unregister);
515 void drm_connector_unregister_all(struct drm_device *dev)
517 struct drm_connector *connector;
518 struct drm_connector_list_iter conn_iter;
520 drm_connector_list_iter_begin(dev, &conn_iter);
521 drm_for_each_connector_iter(connector, &conn_iter)
522 drm_connector_unregister(connector);
523 drm_connector_list_iter_end(&conn_iter);
526 int drm_connector_register_all(struct drm_device *dev)
528 struct drm_connector *connector;
529 struct drm_connector_list_iter conn_iter;
532 drm_connector_list_iter_begin(dev, &conn_iter);
533 drm_for_each_connector_iter(connector, &conn_iter) {
534 ret = drm_connector_register(connector);
538 drm_connector_list_iter_end(&conn_iter);
541 drm_connector_unregister_all(dev);
546 * drm_get_connector_status_name - return a string for connector status
547 * @status: connector status to compute name of
549 * In contrast to the other drm_get_*_name functions this one here returns a
550 * const pointer and hence is threadsafe.
552 const char *drm_get_connector_status_name(enum drm_connector_status status)
554 if (status == connector_status_connected)
556 else if (status == connector_status_disconnected)
557 return "disconnected";
561 EXPORT_SYMBOL(drm_get_connector_status_name);
564 * drm_get_connector_force_name - return a string for connector force
565 * @force: connector force to get name of
567 * Returns: const pointer to name.
569 const char *drm_get_connector_force_name(enum drm_connector_force force)
572 case DRM_FORCE_UNSPECIFIED:
573 return "unspecified";
578 case DRM_FORCE_ON_DIGITAL:
585 #ifdef CONFIG_LOCKDEP
586 static struct lockdep_map connector_list_iter_dep_map = {
587 .name = "drm_connector_list_iter"
592 * drm_connector_list_iter_begin - initialize a connector_list iterator
594 * @iter: connector_list iterator
596 * Sets @iter up to walk the &drm_mode_config.connector_list of @dev. @iter
597 * must always be cleaned up again by calling drm_connector_list_iter_end().
598 * Iteration itself happens using drm_connector_list_iter_next() or
599 * drm_for_each_connector_iter().
601 void drm_connector_list_iter_begin(struct drm_device *dev,
602 struct drm_connector_list_iter *iter)
606 lock_acquire_shared_recursive(&connector_list_iter_dep_map, 0, 1, NULL, _RET_IP_);
608 EXPORT_SYMBOL(drm_connector_list_iter_begin);
611 * Extra-safe connector put function that works in any context. Should only be
612 * used from the connector_iter functions, where we never really expect to
613 * actually release the connector when dropping our final reference.
616 __drm_connector_put_safe(struct drm_connector *conn)
618 struct drm_mode_config *config = &conn->dev->mode_config;
620 lockdep_assert_held(&config->connector_list_lock);
622 if (!refcount_dec_and_test(&conn->base.refcount.refcount))
625 llist_add(&conn->free_node, &config->connector_free_list);
626 schedule_work(&config->connector_free_work);
630 * drm_connector_list_iter_next - return next connector
631 * @iter: connector_list iterator
633 * Returns the next connector for @iter, or NULL when the list walk has
636 struct drm_connector *
637 drm_connector_list_iter_next(struct drm_connector_list_iter *iter)
639 struct drm_connector *old_conn = iter->conn;
640 struct drm_mode_config *config = &iter->dev->mode_config;
641 struct list_head *lhead;
644 spin_lock_irqsave(&config->connector_list_lock, flags);
645 lhead = old_conn ? &old_conn->head : &config->connector_list;
648 if (lhead->next == &config->connector_list) {
654 iter->conn = list_entry(lhead, struct drm_connector, head);
656 /* loop until it's not a zombie connector */
657 } while (!kref_get_unless_zero(&iter->conn->base.refcount));
660 __drm_connector_put_safe(old_conn);
661 spin_unlock_irqrestore(&config->connector_list_lock, flags);
665 EXPORT_SYMBOL(drm_connector_list_iter_next);
668 * drm_connector_list_iter_end - tear down a connector_list iterator
669 * @iter: connector_list iterator
671 * Tears down @iter and releases any resources (like &drm_connector references)
672 * acquired while walking the list. This must always be called, both when the
673 * iteration completes fully or when it was aborted without walking the entire
676 void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
678 struct drm_mode_config *config = &iter->dev->mode_config;
683 spin_lock_irqsave(&config->connector_list_lock, flags);
684 __drm_connector_put_safe(iter->conn);
685 spin_unlock_irqrestore(&config->connector_list_lock, flags);
687 lock_release(&connector_list_iter_dep_map, 0, _RET_IP_);
689 EXPORT_SYMBOL(drm_connector_list_iter_end);
691 static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
692 { SubPixelUnknown, "Unknown" },
693 { SubPixelHorizontalRGB, "Horizontal RGB" },
694 { SubPixelHorizontalBGR, "Horizontal BGR" },
695 { SubPixelVerticalRGB, "Vertical RGB" },
696 { SubPixelVerticalBGR, "Vertical BGR" },
697 { SubPixelNone, "None" },
701 * drm_get_subpixel_order_name - return a string for a given subpixel enum
702 * @order: enum of subpixel_order
704 * Note you could abuse this and return something out of bounds, but that
705 * would be a caller error. No unscrubbed user data should make it here.
707 const char *drm_get_subpixel_order_name(enum subpixel_order order)
709 return drm_subpixel_enum_list[order].name;
711 EXPORT_SYMBOL(drm_get_subpixel_order_name);
713 static const struct drm_prop_enum_list drm_dpms_enum_list[] = {
714 { DRM_MODE_DPMS_ON, "On" },
715 { DRM_MODE_DPMS_STANDBY, "Standby" },
716 { DRM_MODE_DPMS_SUSPEND, "Suspend" },
717 { DRM_MODE_DPMS_OFF, "Off" }
719 DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)
721 static const struct drm_prop_enum_list drm_link_status_enum_list[] = {
722 { DRM_MODE_LINK_STATUS_GOOD, "Good" },
723 { DRM_MODE_LINK_STATUS_BAD, "Bad" },
727 * drm_display_info_set_bus_formats - set the supported bus formats
728 * @info: display info to store bus formats in
729 * @formats: array containing the supported bus formats
730 * @num_formats: the number of entries in the fmts array
732 * Store the supported bus formats in display info structure.
733 * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
734 * a full list of available formats.
736 int drm_display_info_set_bus_formats(struct drm_display_info *info,
738 unsigned int num_formats)
742 if (!formats && num_formats)
745 if (formats && num_formats) {
746 fmts = kmemdup(formats, sizeof(*formats) * num_formats,
752 kfree(info->bus_formats);
753 info->bus_formats = fmts;
754 info->num_bus_formats = num_formats;
758 EXPORT_SYMBOL(drm_display_info_set_bus_formats);
760 /* Optional connector properties. */
761 static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = {
762 { DRM_MODE_SCALE_NONE, "None" },
763 { DRM_MODE_SCALE_FULLSCREEN, "Full" },
764 { DRM_MODE_SCALE_CENTER, "Center" },
765 { DRM_MODE_SCALE_ASPECT, "Full aspect" },
768 static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
769 { DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
770 { DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
771 { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
774 static const struct drm_prop_enum_list drm_content_type_enum_list[] = {
775 { DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" },
776 { DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" },
777 { DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" },
778 { DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" },
779 { DRM_MODE_CONTENT_TYPE_GAME, "Game" },
782 static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = {
783 { DRM_MODE_PANEL_ORIENTATION_NORMAL, "Normal" },
784 { DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP, "Upside Down" },
785 { DRM_MODE_PANEL_ORIENTATION_LEFT_UP, "Left Side Up" },
786 { DRM_MODE_PANEL_ORIENTATION_RIGHT_UP, "Right Side Up" },
789 static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = {
790 { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
791 { DRM_MODE_SUBCONNECTOR_DVID, "DVI-D" }, /* DVI-I */
792 { DRM_MODE_SUBCONNECTOR_DVIA, "DVI-A" }, /* DVI-I */
794 DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)
796 static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = {
797 { DRM_MODE_SUBCONNECTOR_Unknown, "Unknown" }, /* DVI-I and TV-out */
798 { DRM_MODE_SUBCONNECTOR_DVID, "DVI-D" }, /* DVI-I */
799 { DRM_MODE_SUBCONNECTOR_DVIA, "DVI-A" }, /* DVI-I */
801 DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
802 drm_dvi_i_subconnector_enum_list)
804 static const struct drm_prop_enum_list drm_tv_select_enum_list[] = {
805 { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
806 { DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
807 { DRM_MODE_SUBCONNECTOR_SVIDEO, "SVIDEO" }, /* TV-out */
808 { DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
809 { DRM_MODE_SUBCONNECTOR_SCART, "SCART" }, /* TV-out */
811 DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)
813 static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
814 { DRM_MODE_SUBCONNECTOR_Unknown, "Unknown" }, /* DVI-I and TV-out */
815 { DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
816 { DRM_MODE_SUBCONNECTOR_SVIDEO, "SVIDEO" }, /* TV-out */
817 { DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
818 { DRM_MODE_SUBCONNECTOR_SCART, "SCART" }, /* TV-out */
820 DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
821 drm_tv_subconnector_enum_list)
823 static const struct drm_prop_enum_list hdmi_colorspaces[] = {
824 /* For Default case, driver will set the colorspace */
825 { DRM_MODE_COLORIMETRY_DEFAULT, "Default" },
826 /* Standard Definition Colorimetry based on CEA 861 */
827 { DRM_MODE_COLORIMETRY_SMPTE_170M_YCC, "SMPTE_170M_YCC" },
828 { DRM_MODE_COLORIMETRY_BT709_YCC, "BT709_YCC" },
829 /* Standard Definition Colorimetry based on IEC 61966-2-4 */
830 { DRM_MODE_COLORIMETRY_XVYCC_601, "XVYCC_601" },
831 /* High Definition Colorimetry based on IEC 61966-2-4 */
832 { DRM_MODE_COLORIMETRY_XVYCC_709, "XVYCC_709" },
833 /* Colorimetry based on IEC 61966-2-1/Amendment 1 */
834 { DRM_MODE_COLORIMETRY_SYCC_601, "SYCC_601" },
835 /* Colorimetry based on IEC 61966-2-5 [33] */
836 { DRM_MODE_COLORIMETRY_OPYCC_601, "opYCC_601" },
837 /* Colorimetry based on IEC 61966-2-5 */
838 { DRM_MODE_COLORIMETRY_OPRGB, "opRGB" },
839 /* Colorimetry based on ITU-R BT.2020 */
840 { DRM_MODE_COLORIMETRY_BT2020_CYCC, "BT2020_CYCC" },
841 /* Colorimetry based on ITU-R BT.2020 */
842 { DRM_MODE_COLORIMETRY_BT2020_RGB, "BT2020_RGB" },
843 /* Colorimetry based on ITU-R BT.2020 */
844 { DRM_MODE_COLORIMETRY_BT2020_YCC, "BT2020_YCC" },
845 /* Added as part of Additional Colorimetry Extension in 861.G */
846 { DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65, "DCI-P3_RGB_D65" },
847 { DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER, "DCI-P3_RGB_Theater" },
851 * DOC: standard connector properties
853 * DRM connectors have a few standardized properties:
856 * Blob property which contains the current EDID read from the sink. This
857 * is useful to parse sink identification information like vendor, model
858 * and serial. Drivers should update this property by calling
859 * drm_connector_update_edid_property(), usually after having parsed
860 * the EDID using drm_add_edid_modes(). Userspace cannot change this
863 * Legacy property for setting the power state of the connector. For atomic
864 * drivers this is only provided for backwards compatibility with existing
865 * drivers, it remaps to controlling the "ACTIVE" property on the CRTC the
866 * connector is linked to. Drivers should never set this property directly,
867 * it is handled by the DRM core by calling the &drm_connector_funcs.dpms
868 * callback. For atomic drivers the remapping to the "ACTIVE" property is
869 * implemented in the DRM core. This is the only standard connector
870 * property that userspace can change.
872 * Note that this property cannot be set through the MODE_ATOMIC ioctl,
873 * userspace must use "ACTIVE" on the CRTC instead.
877 * For userspace also running on legacy drivers the "DPMS" semantics are a
878 * lot more complicated. First, userspace cannot rely on the "DPMS" value
879 * returned by the GETCONNECTOR actually reflecting reality, because many
880 * drivers fail to update it. For atomic drivers this is taken care of in
881 * drm_atomic_helper_update_legacy_modeset_state().
883 * The second issue is that the DPMS state is only well-defined when the
884 * connector is connected to a CRTC. In atomic the DRM core enforces that
885 * "ACTIVE" is off in such a case, no such checks exists for "DPMS".
887 * Finally, when enabling an output using the legacy SETCONFIG ioctl then
888 * "DPMS" is forced to ON. But see above, that might not be reflected in
889 * the software value on legacy drivers.
891 * Summarizing: Only set "DPMS" when the connector is known to be enabled,
892 * assume that a successful SETCONFIG call also sets "DPMS" to on, and
893 * never read back the value of "DPMS" because it can be incorrect.
895 * Connector path property to identify how this sink is physically
896 * connected. Used by DP MST. This should be set by calling
897 * drm_connector_set_path_property(), in the case of DP MST with the
898 * path property the MST manager created. Userspace cannot change this
901 * Connector tile group property to indicate how a set of DRM connector
902 * compose together into one logical screen. This is used by both high-res
903 * external screens (often only using a single cable, but exposing multiple
904 * DP MST sinks), or high-res integrated panels (like dual-link DSI) which
905 * are not gen-locked. Note that for tiled panels which are genlocked, like
906 * dual-link LVDS or dual-link DSI, the driver should try to not expose the
907 * tiling and virtualize both &drm_crtc and &drm_plane if needed. Drivers
908 * should update this value using drm_connector_set_tile_property().
909 * Userspace cannot change this property.
911 * Connector link-status property to indicate the status of link. The
912 * default value of link-status is "GOOD". If something fails during or
913 * after modeset, the kernel driver may set this to "BAD" and issue a
914 * hotplug uevent. Drivers should update this value using
915 * drm_connector_set_link_status_property().
917 * Indicates the output should be ignored for purposes of displaying a
918 * standard desktop environment or console. This is most likely because
919 * the output device is not rectilinear.
920 * Content Protection:
921 * This property is used by userspace to request the kernel protect future
922 * content communicated over the link. When requested, kernel will apply
923 * the appropriate means of protection (most often HDCP), and use the
924 * property to tell userspace the protection is active.
926 * Drivers can set this up by calling
927 * drm_connector_attach_content_protection_property() on initialization.
929 * The value of this property can be one of the following:
931 * DRM_MODE_CONTENT_PROTECTION_UNDESIRED = 0
932 * The link is not protected, content is transmitted in the clear.
933 * DRM_MODE_CONTENT_PROTECTION_DESIRED = 1
934 * Userspace has requested content protection, but the link is not
935 * currently protected. When in this state, kernel should enable
936 * Content Protection as soon as possible.
937 * DRM_MODE_CONTENT_PROTECTION_ENABLED = 2
938 * Userspace has requested content protection, and the link is
939 * protected. Only the driver can set the property to this value.
940 * If userspace attempts to set to ENABLED, kernel will return
945 * - DESIRED state should be preserved until userspace de-asserts it by
946 * setting the property to UNDESIRED. This means ENABLED should only
947 * transition to UNDESIRED when the user explicitly requests it.
948 * - If the state is DESIRED, kernel should attempt to re-authenticate the
949 * link whenever possible. This includes across disable/enable, dpms,
950 * hotplug, downstream device changes, link status failures, etc..
951 * - Userspace is responsible for polling the property to determine when
952 * the value transitions from ENABLED to DESIRED. This signifies the link
953 * is no longer protected and userspace should take appropriate action
954 * (whatever that might be).
956 * HDR_OUTPUT_METADATA:
957 * Connector property to enable userspace to send HDR Metadata to
958 * driver. This metadata is based on the composition and blending
959 * policies decided by user, taking into account the hardware and
960 * sink capabilities. The driver gets this metadata and creates a
961 * Dynamic Range and Mastering Infoframe (DRM) in case of HDMI,
962 * SDP packet (Non-audio INFOFRAME SDP v1.3) for DP. This is then
963 * sent to sink. This notifies the sink of the upcoming frame's Color
964 * Encoding and Luminance parameters.
966 * Userspace first need to detect the HDR capabilities of sink by
967 * reading and parsing the EDID. Details of HDR metadata for HDMI
968 * are added in CTA 861.G spec. For DP , its defined in VESA DP
969 * Standard v1.4. It needs to then get the metadata information
970 * of the video/game/app content which are encoded in HDR (basically
971 * using HDR transfer functions). With this information it needs to
972 * decide on a blending policy and compose the relevant
973 * layers/overlays into a common format. Once this blending is done,
974 * userspace will be aware of the metadata of the composed frame to
975 * be send to sink. It then uses this property to communicate this
976 * metadata to driver which then make a Infoframe packet and sends
977 * to sink based on the type of encoder connected.
979 * Userspace will be responsible to do Tone mapping operation in case:
980 * - Some layers are HDR and others are SDR
981 * - HDR layers luminance is not same as sink
983 * It will even need to do colorspace conversion and get all layers
984 * to one common colorspace for blending. It can use either GL, Media
985 * or display engine to get this done based on the capabilties of the
986 * associated hardware.
988 * Driver expects metadata to be put in &struct hdr_output_metadata
989 * structure from userspace. This is received as blob and stored in
990 * &drm_connector_state.hdr_output_metadata. It parses EDID and saves the
991 * sink metadata in &struct hdr_sink_metadata, as
992 * &drm_connector.hdr_sink_metadata. Driver uses
993 * drm_hdmi_infoframe_set_hdr_metadata() helper to set the HDR metadata,
994 * hdmi_drm_infoframe_pack() to pack the infoframe as per spec, in case of
998 * This range property is used by userspace to limit the bit depth. When
999 * used the driver would limit the bpc in accordance with the valid range
1000 * supported by the hardware and sink. Drivers to use the function
1001 * drm_connector_attach_max_bpc_property() to create and attach the
1002 * property to the connector during initialization.
1004 * Connectors also have one standardized atomic property:
1007 * Mode object ID of the &drm_crtc this connector should be connected to.
1009 * Connectors for LCD panels may also have one standardized property:
1011 * panel orientation:
1012 * On some devices the LCD panel is mounted in the casing in such a way
1013 * that the up/top side of the panel does not match with the top side of
1014 * the device. Userspace can use this property to check for this.
1015 * Note that input coordinates from touchscreens (input devices with
1016 * INPUT_PROP_DIRECT) will still map 1:1 to the actual LCD panel
1017 * coordinates, so if userspace rotates the picture to adjust for
1018 * the orientation it must also apply the same transformation to the
1019 * touchscreen input coordinates. This property is initialized by calling
1020 * drm_connector_init_panel_orientation_property().
1023 * This property defines how a non-native mode is upscaled to the native
1024 * mode of an LCD panel:
1027 * No upscaling happens, scaling is left to the panel. Not all
1028 * drivers expose this mode.
1030 * The output is upscaled to the full resolution of the panel,
1031 * ignoring the aspect ratio.
1033 * No upscaling happens, the output is centered within the native
1034 * resolution the panel.
1036 * The output is upscaled to maximize either the width or height
1037 * while retaining the aspect ratio.
1039 * This property should be set up by calling
1040 * drm_connector_attach_scaling_mode_property(). Note that drivers
1041 * can also expose this property to external outputs, in which case they
1042 * must support "None", which should be the default (since external screens
1043 * have a built-in scaler).
1046 int drm_connector_create_standard_properties(struct drm_device *dev)
1048 struct drm_property *prop;
1050 prop = drm_property_create(dev, DRM_MODE_PROP_BLOB |
1051 DRM_MODE_PROP_IMMUTABLE,
1055 dev->mode_config.edid_property = prop;
1057 prop = drm_property_create_enum(dev, 0,
1058 "DPMS", drm_dpms_enum_list,
1059 ARRAY_SIZE(drm_dpms_enum_list));
1062 dev->mode_config.dpms_property = prop;
1064 prop = drm_property_create(dev,
1065 DRM_MODE_PROP_BLOB |
1066 DRM_MODE_PROP_IMMUTABLE,
1070 dev->mode_config.path_property = prop;
1072 prop = drm_property_create(dev,
1073 DRM_MODE_PROP_BLOB |
1074 DRM_MODE_PROP_IMMUTABLE,
1078 dev->mode_config.tile_property = prop;
1080 prop = drm_property_create_enum(dev, 0, "link-status",
1081 drm_link_status_enum_list,
1082 ARRAY_SIZE(drm_link_status_enum_list));
1085 dev->mode_config.link_status_property = prop;
1087 prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE, "non-desktop");
1090 dev->mode_config.non_desktop_property = prop;
1092 prop = drm_property_create(dev, DRM_MODE_PROP_BLOB,
1093 "HDR_OUTPUT_METADATA", 0);
1096 dev->mode_config.hdr_output_metadata_property = prop;
1102 * drm_mode_create_dvi_i_properties - create DVI-I specific connector properties
1105 * Called by a driver the first time a DVI-I connector is made.
1107 int drm_mode_create_dvi_i_properties(struct drm_device *dev)
1109 struct drm_property *dvi_i_selector;
1110 struct drm_property *dvi_i_subconnector;
1112 if (dev->mode_config.dvi_i_select_subconnector_property)
1116 drm_property_create_enum(dev, 0,
1117 "select subconnector",
1118 drm_dvi_i_select_enum_list,
1119 ARRAY_SIZE(drm_dvi_i_select_enum_list));
1120 dev->mode_config.dvi_i_select_subconnector_property = dvi_i_selector;
1122 dvi_i_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
1124 drm_dvi_i_subconnector_enum_list,
1125 ARRAY_SIZE(drm_dvi_i_subconnector_enum_list));
1126 dev->mode_config.dvi_i_subconnector_property = dvi_i_subconnector;
1130 EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);
1133 * DOC: HDMI connector properties
1135 * content type (HDMI specific):
1136 * Indicates content type setting to be used in HDMI infoframes to indicate
1137 * content type for the external device, so that it adjusts its display
1138 * settings accordingly.
1140 * The value of this property can be one of the following:
1143 * Content type is unknown
1145 * Content type is graphics
1147 * Content type is photo
1149 * Content type is cinema
1151 * Content type is game
1153 * Drivers can set up this property by calling
1154 * drm_connector_attach_content_type_property(). Decoding to
1155 * infoframe values is done through drm_hdmi_avi_infoframe_content_type().
1159 * drm_connector_attach_content_type_property - attach content-type property
1160 * @connector: connector to attach content type property on.
1162 * Called by a driver the first time a HDMI connector is made.
1164 int drm_connector_attach_content_type_property(struct drm_connector *connector)
1166 if (!drm_mode_create_content_type_property(connector->dev))
1167 drm_object_attach_property(&connector->base,
1168 connector->dev->mode_config.content_type_property,
1169 DRM_MODE_CONTENT_TYPE_NO_DATA);
1172 EXPORT_SYMBOL(drm_connector_attach_content_type_property);
1176 * drm_hdmi_avi_infoframe_content_type() - fill the HDMI AVI infoframe
1177 * content type information, based
1178 * on correspondent DRM property.
1179 * @frame: HDMI AVI infoframe
1180 * @conn_state: DRM display connector state
1183 void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame,
1184 const struct drm_connector_state *conn_state)
1186 switch (conn_state->content_type) {
1187 case DRM_MODE_CONTENT_TYPE_GRAPHICS:
1188 frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS;
1190 case DRM_MODE_CONTENT_TYPE_CINEMA:
1191 frame->content_type = HDMI_CONTENT_TYPE_CINEMA;
1193 case DRM_MODE_CONTENT_TYPE_GAME:
1194 frame->content_type = HDMI_CONTENT_TYPE_GAME;
1196 case DRM_MODE_CONTENT_TYPE_PHOTO:
1197 frame->content_type = HDMI_CONTENT_TYPE_PHOTO;
1200 /* Graphics is the default(0) */
1201 frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS;
1204 frame->itc = conn_state->content_type != DRM_MODE_CONTENT_TYPE_NO_DATA;
1206 EXPORT_SYMBOL(drm_hdmi_avi_infoframe_content_type);
1209 * drm_mode_attach_tv_margin_properties - attach TV connector margin properties
1210 * @connector: DRM connector
1212 * Called by a driver when it needs to attach TV margin props to a connector.
1213 * Typically used on SDTV and HDMI connectors.
1215 void drm_connector_attach_tv_margin_properties(struct drm_connector *connector)
1217 struct drm_device *dev = connector->dev;
1219 drm_object_attach_property(&connector->base,
1220 dev->mode_config.tv_left_margin_property,
1222 drm_object_attach_property(&connector->base,
1223 dev->mode_config.tv_right_margin_property,
1225 drm_object_attach_property(&connector->base,
1226 dev->mode_config.tv_top_margin_property,
1228 drm_object_attach_property(&connector->base,
1229 dev->mode_config.tv_bottom_margin_property,
1232 EXPORT_SYMBOL(drm_connector_attach_tv_margin_properties);
1235 * drm_mode_create_tv_margin_properties - create TV connector margin properties
1238 * Called by a driver's HDMI connector initialization routine, this function
1239 * creates the TV margin properties for a given device. No need to call this
1240 * function for an SDTV connector, it's already called from
1241 * drm_mode_create_tv_properties().
1243 int drm_mode_create_tv_margin_properties(struct drm_device *dev)
1245 if (dev->mode_config.tv_left_margin_property)
1248 dev->mode_config.tv_left_margin_property =
1249 drm_property_create_range(dev, 0, "left margin", 0, 100);
1250 if (!dev->mode_config.tv_left_margin_property)
1253 dev->mode_config.tv_right_margin_property =
1254 drm_property_create_range(dev, 0, "right margin", 0, 100);
1255 if (!dev->mode_config.tv_right_margin_property)
1258 dev->mode_config.tv_top_margin_property =
1259 drm_property_create_range(dev, 0, "top margin", 0, 100);
1260 if (!dev->mode_config.tv_top_margin_property)
1263 dev->mode_config.tv_bottom_margin_property =
1264 drm_property_create_range(dev, 0, "bottom margin", 0, 100);
1265 if (!dev->mode_config.tv_bottom_margin_property)
1270 EXPORT_SYMBOL(drm_mode_create_tv_margin_properties);
1273 * drm_mode_create_tv_properties - create TV specific connector properties
1275 * @num_modes: number of different TV formats (modes) supported
1276 * @modes: array of pointers to strings containing name of each format
1278 * Called by a driver's TV initialization routine, this function creates
1279 * the TV specific connector properties for a given device. Caller is
1280 * responsible for allocating a list of format names and passing them to
1283 int drm_mode_create_tv_properties(struct drm_device *dev,
1284 unsigned int num_modes,
1285 const char * const modes[])
1287 struct drm_property *tv_selector;
1288 struct drm_property *tv_subconnector;
1291 if (dev->mode_config.tv_select_subconnector_property)
1295 * Basic connector properties
1297 tv_selector = drm_property_create_enum(dev, 0,
1298 "select subconnector",
1299 drm_tv_select_enum_list,
1300 ARRAY_SIZE(drm_tv_select_enum_list));
1304 dev->mode_config.tv_select_subconnector_property = tv_selector;
1307 drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
1309 drm_tv_subconnector_enum_list,
1310 ARRAY_SIZE(drm_tv_subconnector_enum_list));
1311 if (!tv_subconnector)
1313 dev->mode_config.tv_subconnector_property = tv_subconnector;
1316 * Other, TV specific properties: margins & TV modes.
1318 if (drm_mode_create_tv_margin_properties(dev))
1321 dev->mode_config.tv_mode_property =
1322 drm_property_create(dev, DRM_MODE_PROP_ENUM,
1324 if (!dev->mode_config.tv_mode_property)
1327 for (i = 0; i < num_modes; i++)
1328 drm_property_add_enum(dev->mode_config.tv_mode_property,
1331 dev->mode_config.tv_brightness_property =
1332 drm_property_create_range(dev, 0, "brightness", 0, 100);
1333 if (!dev->mode_config.tv_brightness_property)
1336 dev->mode_config.tv_contrast_property =
1337 drm_property_create_range(dev, 0, "contrast", 0, 100);
1338 if (!dev->mode_config.tv_contrast_property)
1341 dev->mode_config.tv_flicker_reduction_property =
1342 drm_property_create_range(dev, 0, "flicker reduction", 0, 100);
1343 if (!dev->mode_config.tv_flicker_reduction_property)
1346 dev->mode_config.tv_overscan_property =
1347 drm_property_create_range(dev, 0, "overscan", 0, 100);
1348 if (!dev->mode_config.tv_overscan_property)
1351 dev->mode_config.tv_saturation_property =
1352 drm_property_create_range(dev, 0, "saturation", 0, 100);
1353 if (!dev->mode_config.tv_saturation_property)
1356 dev->mode_config.tv_hue_property =
1357 drm_property_create_range(dev, 0, "hue", 0, 100);
1358 if (!dev->mode_config.tv_hue_property)
1365 EXPORT_SYMBOL(drm_mode_create_tv_properties);
1368 * drm_mode_create_scaling_mode_property - create scaling mode property
1371 * Called by a driver the first time it's needed, must be attached to desired
1374 * Atomic drivers should use drm_connector_attach_scaling_mode_property()
1375 * instead to correctly assign &drm_connector_state.picture_aspect_ratio
1376 * in the atomic state.
1378 int drm_mode_create_scaling_mode_property(struct drm_device *dev)
1380 struct drm_property *scaling_mode;
1382 if (dev->mode_config.scaling_mode_property)
1386 drm_property_create_enum(dev, 0, "scaling mode",
1387 drm_scaling_mode_enum_list,
1388 ARRAY_SIZE(drm_scaling_mode_enum_list));
1390 dev->mode_config.scaling_mode_property = scaling_mode;
1394 EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
1397 * DOC: Variable refresh properties
1399 * Variable refresh rate capable displays can dynamically adjust their
1400 * refresh rate by extending the duration of their vertical front porch
1401 * until page flip or timeout occurs. This can reduce or remove stuttering
1402 * and latency in scenarios where the page flip does not align with the
1405 * An example scenario would be an application flipping at a constant rate
1406 * of 48Hz on a 60Hz display. The page flip will frequently miss the vblank
1407 * interval and the same contents will be displayed twice. This can be
1408 * observed as stuttering for content with motion.
1410 * If variable refresh rate was active on a display that supported a
1411 * variable refresh range from 35Hz to 60Hz no stuttering would be observable
1412 * for the example scenario. The minimum supported variable refresh rate of
1413 * 35Hz is below the page flip frequency and the vertical front porch can
1414 * be extended until the page flip occurs. The vblank interval will be
1415 * directly aligned to the page flip rate.
1417 * Not all userspace content is suitable for use with variable refresh rate.
1418 * Large and frequent changes in vertical front porch duration may worsen
1419 * perceived stuttering for input sensitive applications.
1421 * Panel brightness will also vary with vertical front porch duration. Some
1422 * panels may have noticeable differences in brightness between the minimum
1423 * vertical front porch duration and the maximum vertical front porch duration.
1424 * Large and frequent changes in vertical front porch duration may produce
1425 * observable flickering for such panels.
1427 * Userspace control for variable refresh rate is supported via properties
1428 * on the &drm_connector and &drm_crtc objects.
1431 * Optional &drm_connector boolean property that drivers should attach
1432 * with drm_connector_attach_vrr_capable_property() on connectors that
1433 * could support variable refresh rates. Drivers should update the
1434 * property value by calling drm_connector_set_vrr_capable_property().
1436 * Absence of the property should indicate absence of support.
1439 * Default &drm_crtc boolean property that notifies the driver that the
1440 * content on the CRTC is suitable for variable refresh rate presentation.
1441 * The driver will take this property as a hint to enable variable
1442 * refresh rate support if the receiver supports it, ie. if the
1443 * "vrr_capable" property is true on the &drm_connector object. The
1444 * vertical front porch duration will be extended until page-flip or
1445 * timeout when enabled.
1447 * The minimum vertical front porch duration is defined as the vertical
1448 * front porch duration for the current mode.
1450 * The maximum vertical front porch duration is greater than or equal to
1451 * the minimum vertical front porch duration. The duration is derived
1452 * from the minimum supported variable refresh rate for the connector.
1454 * The driver may place further restrictions within these minimum
1455 * and maximum bounds.
1459 * drm_connector_attach_vrr_capable_property - creates the
1460 * vrr_capable property
1461 * @connector: connector to create the vrr_capable property on.
1463 * This is used by atomic drivers to add support for querying
1464 * variable refresh rate capability for a connector.
1467 * Zero on success, negative errono on failure.
1469 int drm_connector_attach_vrr_capable_property(
1470 struct drm_connector *connector)
1472 struct drm_device *dev = connector->dev;
1473 struct drm_property *prop;
1475 if (!connector->vrr_capable_property) {
1476 prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE,
1481 connector->vrr_capable_property = prop;
1482 drm_object_attach_property(&connector->base, prop, 0);
1487 EXPORT_SYMBOL(drm_connector_attach_vrr_capable_property);
1490 * drm_connector_attach_scaling_mode_property - attach atomic scaling mode property
1491 * @connector: connector to attach scaling mode property on.
1492 * @scaling_mode_mask: or'ed mask of BIT(%DRM_MODE_SCALE_\*).
1494 * This is used to add support for scaling mode to atomic drivers.
1495 * The scaling mode will be set to &drm_connector_state.picture_aspect_ratio
1496 * and can be used from &drm_connector_helper_funcs->atomic_check for validation.
1498 * This is the atomic version of drm_mode_create_scaling_mode_property().
1501 * Zero on success, negative errno on failure.
1503 int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
1504 u32 scaling_mode_mask)
1506 struct drm_device *dev = connector->dev;
1507 struct drm_property *scaling_mode_property;
1509 const unsigned valid_scaling_mode_mask =
1510 (1U << ARRAY_SIZE(drm_scaling_mode_enum_list)) - 1;
1512 if (WARN_ON(hweight32(scaling_mode_mask) < 2 ||
1513 scaling_mode_mask & ~valid_scaling_mode_mask))
1516 scaling_mode_property =
1517 drm_property_create(dev, DRM_MODE_PROP_ENUM, "scaling mode",
1518 hweight32(scaling_mode_mask));
1520 if (!scaling_mode_property)
1523 for (i = 0; i < ARRAY_SIZE(drm_scaling_mode_enum_list); i++) {
1526 if (!(BIT(i) & scaling_mode_mask))
1529 ret = drm_property_add_enum(scaling_mode_property,
1530 drm_scaling_mode_enum_list[i].type,
1531 drm_scaling_mode_enum_list[i].name);
1534 drm_property_destroy(dev, scaling_mode_property);
1540 drm_object_attach_property(&connector->base,
1541 scaling_mode_property, 0);
1543 connector->scaling_mode_property = scaling_mode_property;
1547 EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property);
1550 * drm_mode_create_aspect_ratio_property - create aspect ratio property
1553 * Called by a driver the first time it's needed, must be attached to desired
1557 * Zero on success, negative errno on failure.
1559 int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
1561 if (dev->mode_config.aspect_ratio_property)
1564 dev->mode_config.aspect_ratio_property =
1565 drm_property_create_enum(dev, 0, "aspect ratio",
1566 drm_aspect_ratio_enum_list,
1567 ARRAY_SIZE(drm_aspect_ratio_enum_list));
1569 if (dev->mode_config.aspect_ratio_property == NULL)
1574 EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);
1577 * DOC: standard connector properties
1580 * drm_mode_create_colorspace_property - create colorspace property
1581 * This property helps select a suitable colorspace based on the sink
1582 * capability. Modern sink devices support wider gamut like BT2020.
1583 * This helps switch to BT2020 mode if the BT2020 encoded video stream
1584 * is being played by the user, same for any other colorspace. Thereby
1585 * giving a good visual experience to users.
1587 * The expectation from userspace is that it should parse the EDID
1588 * and get supported colorspaces. Use this property and switch to the
1589 * one supported. Sink supported colorspaces should be retrieved by
1590 * userspace from EDID and driver will not explicitly expose them.
1592 * Basically the expectation from userspace is:
1593 * - Set up CRTC DEGAMMA/CTM/GAMMA to convert to some sink
1595 * - Set this new property to let the sink know what it
1596 * converted the CRTC output to.
1597 * - This property is just to inform sink what colorspace
1598 * source is trying to drive.
1600 * Called by a driver the first time it's needed, must be attached to desired
1603 int drm_mode_create_colorspace_property(struct drm_connector *connector)
1605 struct drm_device *dev = connector->dev;
1606 struct drm_property *prop;
1608 if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
1609 connector->connector_type == DRM_MODE_CONNECTOR_HDMIB) {
1610 prop = drm_property_create_enum(dev, DRM_MODE_PROP_ENUM,
1613 ARRAY_SIZE(hdmi_colorspaces));
1617 DRM_DEBUG_KMS("Colorspace property not supported\n");
1621 connector->colorspace_property = prop;
1625 EXPORT_SYMBOL(drm_mode_create_colorspace_property);
1628 * drm_mode_create_content_type_property - create content type property
1631 * Called by a driver the first time it's needed, must be attached to desired
1635 * Zero on success, negative errno on failure.
1637 int drm_mode_create_content_type_property(struct drm_device *dev)
1639 if (dev->mode_config.content_type_property)
1642 dev->mode_config.content_type_property =
1643 drm_property_create_enum(dev, 0, "content type",
1644 drm_content_type_enum_list,
1645 ARRAY_SIZE(drm_content_type_enum_list));
1647 if (dev->mode_config.content_type_property == NULL)
1652 EXPORT_SYMBOL(drm_mode_create_content_type_property);
1655 * drm_mode_create_suggested_offset_properties - create suggests offset properties
1658 * Create the the suggested x/y offset property for connectors.
1660 int drm_mode_create_suggested_offset_properties(struct drm_device *dev)
1662 if (dev->mode_config.suggested_x_property && dev->mode_config.suggested_y_property)
1665 dev->mode_config.suggested_x_property =
1666 drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested X", 0, 0xffffffff);
1668 dev->mode_config.suggested_y_property =
1669 drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested Y", 0, 0xffffffff);
1671 if (dev->mode_config.suggested_x_property == NULL ||
1672 dev->mode_config.suggested_y_property == NULL)
1676 EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties);
1679 * drm_connector_set_path_property - set tile property on connector
1680 * @connector: connector to set property on.
1681 * @path: path to use for property; must not be NULL.
1683 * This creates a property to expose to userspace to specify a
1684 * connector path. This is mainly used for DisplayPort MST where
1685 * connectors have a topology and we want to allow userspace to give
1686 * them more meaningful names.
1689 * Zero on success, negative errno on failure.
1691 int drm_connector_set_path_property(struct drm_connector *connector,
1694 struct drm_device *dev = connector->dev;
1697 ret = drm_property_replace_global_blob(dev,
1698 &connector->path_blob_ptr,
1702 dev->mode_config.path_property);
1705 EXPORT_SYMBOL(drm_connector_set_path_property);
1708 * drm_connector_set_tile_property - set tile property on connector
1709 * @connector: connector to set property on.
1711 * This looks up the tile information for a connector, and creates a
1712 * property for userspace to parse if it exists. The property is of
1713 * the form of 8 integers using ':' as a separator.
1714 * This is used for dual port tiled displays with DisplayPort SST
1715 * or DisplayPort MST connectors.
1718 * Zero on success, errno on failure.
1720 int drm_connector_set_tile_property(struct drm_connector *connector)
1722 struct drm_device *dev = connector->dev;
1726 if (!connector->has_tile) {
1727 ret = drm_property_replace_global_blob(dev,
1728 &connector->tile_blob_ptr,
1732 dev->mode_config.tile_property);
1736 snprintf(tile, 256, "%d:%d:%d:%d:%d:%d:%d:%d",
1737 connector->tile_group->id, connector->tile_is_single_monitor,
1738 connector->num_h_tile, connector->num_v_tile,
1739 connector->tile_h_loc, connector->tile_v_loc,
1740 connector->tile_h_size, connector->tile_v_size);
1742 ret = drm_property_replace_global_blob(dev,
1743 &connector->tile_blob_ptr,
1747 dev->mode_config.tile_property);
1750 EXPORT_SYMBOL(drm_connector_set_tile_property);
1753 * drm_connector_update_edid_property - update the edid property of a connector
1754 * @connector: drm connector
1755 * @edid: new value of the edid property
1757 * This function creates a new blob modeset object and assigns its id to the
1758 * connector's edid property.
1759 * Since we also parse tile information from EDID's displayID block, we also
1760 * set the connector's tile property here. See drm_connector_set_tile_property()
1764 * Zero on success, negative errno on failure.
1766 int drm_connector_update_edid_property(struct drm_connector *connector,
1767 const struct edid *edid)
1769 struct drm_device *dev = connector->dev;
1773 /* ignore requests to set edid when overridden */
1774 if (connector->override_edid)
1778 size = EDID_LENGTH * (1 + edid->extensions);
1780 /* Set the display info, using edid if available, otherwise
1781 * reseting the values to defaults. This duplicates the work
1782 * done in drm_add_edid_modes, but that function is not
1783 * consistently called before this one in all drivers and the
1784 * computation is cheap enough that it seems better to
1785 * duplicate it rather than attempt to ensure some arbitrary
1786 * ordering of calls.
1789 drm_add_display_info(connector, edid);
1791 drm_reset_display_info(connector);
1793 drm_object_property_set_value(&connector->base,
1794 dev->mode_config.non_desktop_property,
1795 connector->display_info.non_desktop);
1797 ret = drm_property_replace_global_blob(dev,
1798 &connector->edid_blob_ptr,
1802 dev->mode_config.edid_property);
1805 return drm_connector_set_tile_property(connector);
1807 EXPORT_SYMBOL(drm_connector_update_edid_property);
1810 * drm_connector_set_link_status_property - Set link status property of a connector
1811 * @connector: drm connector
1812 * @link_status: new value of link status property (0: Good, 1: Bad)
1814 * In usual working scenario, this link status property will always be set to
1815 * "GOOD". If something fails during or after a mode set, the kernel driver
1816 * may set this link status property to "BAD". The caller then needs to send a
1817 * hotplug uevent for userspace to re-check the valid modes through
1818 * GET_CONNECTOR_IOCTL and retry modeset.
1820 * Note: Drivers cannot rely on userspace to support this property and
1821 * issue a modeset. As such, they may choose to handle issues (like
1822 * re-training a link) without userspace's intervention.
1824 * The reason for adding this property is to handle link training failures, but
1825 * it is not limited to DP or link training. For example, if we implement
1826 * asynchronous setcrtc, this property can be used to report any failures in that.
1828 void drm_connector_set_link_status_property(struct drm_connector *connector,
1829 uint64_t link_status)
1831 struct drm_device *dev = connector->dev;
1833 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1834 connector->state->link_status = link_status;
1835 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1837 EXPORT_SYMBOL(drm_connector_set_link_status_property);
1840 * drm_connector_attach_max_bpc_property - attach "max bpc" property
1841 * @connector: connector to attach max bpc property on.
1842 * @min: The minimum bit depth supported by the connector.
1843 * @max: The maximum bit depth supported by the connector.
1845 * This is used to add support for limiting the bit depth on a connector.
1848 * Zero on success, negative errno on failure.
1850 int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
1853 struct drm_device *dev = connector->dev;
1854 struct drm_property *prop;
1856 prop = connector->max_bpc_property;
1858 prop = drm_property_create_range(dev, 0, "max bpc", min, max);
1862 connector->max_bpc_property = prop;
1865 drm_object_attach_property(&connector->base, prop, max);
1866 connector->state->max_requested_bpc = max;
1867 connector->state->max_bpc = max;
1871 EXPORT_SYMBOL(drm_connector_attach_max_bpc_property);
1874 * drm_connector_set_vrr_capable_property - sets the variable refresh rate
1875 * capable property for a connector
1876 * @connector: drm connector
1877 * @capable: True if the connector is variable refresh rate capable
1879 * Should be used by atomic drivers to update the indicated support for
1880 * variable refresh rate over a connector.
1882 void drm_connector_set_vrr_capable_property(
1883 struct drm_connector *connector, bool capable)
1885 drm_object_property_set_value(&connector->base,
1886 connector->vrr_capable_property,
1889 EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
1892 * drm_connector_init_panel_orientation_property -
1893 * initialize the connecters panel_orientation property
1894 * @connector: connector for which to init the panel-orientation property.
1895 * @width: width in pixels of the panel, used for panel quirk detection
1896 * @height: height in pixels of the panel, used for panel quirk detection
1898 * This function should only be called for built-in panels, after setting
1899 * connector->display_info.panel_orientation first (if known).
1901 * This function will check for platform specific (e.g. DMI based) quirks
1902 * overriding display_info.panel_orientation first, then if panel_orientation
1903 * is not DRM_MODE_PANEL_ORIENTATION_UNKNOWN it will attach the
1904 * "panel orientation" property to the connector.
1907 * Zero on success, negative errno on failure.
1909 int drm_connector_init_panel_orientation_property(
1910 struct drm_connector *connector, int width, int height)
1912 struct drm_device *dev = connector->dev;
1913 struct drm_display_info *info = &connector->display_info;
1914 struct drm_property *prop;
1915 int orientation_quirk;
1917 orientation_quirk = drm_get_panel_orientation_quirk(width, height);
1918 if (orientation_quirk != DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
1919 info->panel_orientation = orientation_quirk;
1921 if (info->panel_orientation == DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
1924 prop = dev->mode_config.panel_orientation_property;
1926 prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
1927 "panel orientation",
1928 drm_panel_orientation_enum_list,
1929 ARRAY_SIZE(drm_panel_orientation_enum_list));
1933 dev->mode_config.panel_orientation_property = prop;
1936 drm_object_attach_property(&connector->base, prop,
1937 info->panel_orientation);
1940 EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
1942 int drm_connector_set_obj_prop(struct drm_mode_object *obj,
1943 struct drm_property *property,
1947 struct drm_connector *connector = obj_to_connector(obj);
1949 /* Do DPMS ourselves */
1950 if (property == connector->dev->mode_config.dpms_property) {
1951 ret = (*connector->funcs->dpms)(connector, (int)value);
1952 } else if (connector->funcs->set_property)
1953 ret = connector->funcs->set_property(connector, property, value);
1956 drm_object_property_set_value(&connector->base, property, value);
1960 int drm_connector_property_set_ioctl(struct drm_device *dev,
1961 void *data, struct drm_file *file_priv)
1963 struct drm_mode_connector_set_property *conn_set_prop = data;
1964 struct drm_mode_obj_set_property obj_set_prop = {
1965 .value = conn_set_prop->value,
1966 .prop_id = conn_set_prop->prop_id,
1967 .obj_id = conn_set_prop->connector_id,
1968 .obj_type = DRM_MODE_OBJECT_CONNECTOR
1971 /* It does all the locking and checking we need */
1972 return drm_mode_obj_set_property_ioctl(dev, &obj_set_prop, file_priv);
1975 static struct drm_encoder *drm_connector_get_encoder(struct drm_connector *connector)
1977 /* For atomic drivers only state objects are synchronously updated and
1978 * protected by modeset locks, so check those first. */
1979 if (connector->state)
1980 return connector->state->best_encoder;
1981 return connector->encoder;
1985 drm_mode_expose_to_userspace(const struct drm_display_mode *mode,
1986 const struct list_head *export_list,
1987 const struct drm_file *file_priv)
1990 * If user-space hasn't configured the driver to expose the stereo 3D
1991 * modes, don't expose them.
1993 if (!file_priv->stereo_allowed && drm_mode_is_stereo(mode))
1996 * If user-space hasn't configured the driver to expose the modes
1997 * with aspect-ratio, don't expose them. However if such a mode
1998 * is unique, let it be exposed, but reset the aspect-ratio flags
1999 * while preparing the list of user-modes.
2001 if (!file_priv->aspect_ratio_allowed) {
2002 struct drm_display_mode *mode_itr;
2004 list_for_each_entry(mode_itr, export_list, export_head)
2005 if (drm_mode_match(mode_itr, mode,
2006 DRM_MODE_MATCH_TIMINGS |
2007 DRM_MODE_MATCH_CLOCK |
2008 DRM_MODE_MATCH_FLAGS |
2009 DRM_MODE_MATCH_3D_FLAGS))
2016 int drm_mode_getconnector(struct drm_device *dev, void *data,
2017 struct drm_file *file_priv)
2019 struct drm_mode_get_connector *out_resp = data;
2020 struct drm_connector *connector;
2021 struct drm_encoder *encoder;
2022 struct drm_display_mode *mode;
2024 int encoders_count = 0;
2028 struct drm_mode_modeinfo u_mode;
2029 struct drm_mode_modeinfo __user *mode_ptr;
2030 uint32_t __user *encoder_ptr;
2031 LIST_HEAD(export_list);
2033 if (!drm_core_check_feature(dev, DRIVER_MODESET))
2036 memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));
2038 connector = drm_connector_lookup(dev, file_priv, out_resp->connector_id);
2042 drm_connector_for_each_possible_encoder(connector, encoder, i)
2045 if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
2047 encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
2049 drm_connector_for_each_possible_encoder(connector, encoder, i) {
2050 if (put_user(encoder->base.id, encoder_ptr + copied)) {
2057 out_resp->count_encoders = encoders_count;
2059 out_resp->connector_id = connector->base.id;
2060 out_resp->connector_type = connector->connector_type;
2061 out_resp->connector_type_id = connector->connector_type_id;
2063 mutex_lock(&dev->mode_config.mutex);
2064 if (out_resp->count_modes == 0) {
2065 connector->funcs->fill_modes(connector,
2066 dev->mode_config.max_width,
2067 dev->mode_config.max_height);
2070 out_resp->mm_width = connector->display_info.width_mm;
2071 out_resp->mm_height = connector->display_info.height_mm;
2072 out_resp->subpixel = connector->display_info.subpixel_order;
2073 out_resp->connection = connector->status;
2075 /* delayed so we get modes regardless of pre-fill_modes state */
2076 list_for_each_entry(mode, &connector->modes, head)
2077 if (drm_mode_expose_to_userspace(mode, &export_list,
2079 list_add_tail(&mode->export_head, &export_list);
2084 * This ioctl is called twice, once to determine how much space is
2085 * needed, and the 2nd time to fill it.
2086 * The modes that need to be exposed to the user are maintained in the
2087 * 'export_list'. When the ioctl is called first time to determine the,
2088 * space, the export_list gets filled, to find the no.of modes. In the
2089 * 2nd time, the user modes are filled, one by one from the export_list.
2091 if ((out_resp->count_modes >= mode_count) && mode_count) {
2093 mode_ptr = (struct drm_mode_modeinfo __user *)(unsigned long)out_resp->modes_ptr;
2094 list_for_each_entry(mode, &export_list, export_head) {
2095 drm_mode_convert_to_umode(&u_mode, mode);
2097 * Reset aspect ratio flags of user-mode, if modes with
2098 * aspect-ratio are not supported.
2100 if (!file_priv->aspect_ratio_allowed)
2101 u_mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2102 if (copy_to_user(mode_ptr + copied,
2103 &u_mode, sizeof(u_mode))) {
2105 mutex_unlock(&dev->mode_config.mutex);
2112 out_resp->count_modes = mode_count;
2113 mutex_unlock(&dev->mode_config.mutex);
2115 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
2116 encoder = drm_connector_get_encoder(connector);
2118 out_resp->encoder_id = encoder->base.id;
2120 out_resp->encoder_id = 0;
2122 /* Only grab properties after probing, to make sure EDID and other
2123 * properties reflect the latest status. */
2124 ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
2125 (uint32_t __user *)(unsigned long)(out_resp->props_ptr),
2126 (uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
2127 &out_resp->count_props);
2128 drm_modeset_unlock(&dev->mode_config.connection_mutex);
2131 drm_connector_put(connector);
2140 * Tile groups are used to represent tiled monitors with a unique integer
2141 * identifier. Tiled monitors using DisplayID v1.3 have a unique 8-byte handle,
2142 * we store this in a tile group, so we have a common identifier for all tiles
2143 * in a monitor group. The property is called "TILE". Drivers can manage tile
2144 * groups using drm_mode_create_tile_group(), drm_mode_put_tile_group() and
2145 * drm_mode_get_tile_group(). But this is only needed for internal panels where
2146 * the tile group information is exposed through a non-standard way.
2149 static void drm_tile_group_free(struct kref *kref)
2151 struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount);
2152 struct drm_device *dev = tg->dev;
2153 mutex_lock(&dev->mode_config.idr_mutex);
2154 idr_remove(&dev->mode_config.tile_idr, tg->id);
2155 mutex_unlock(&dev->mode_config.idr_mutex);
2160 * drm_mode_put_tile_group - drop a reference to a tile group.
2162 * @tg: tile group to drop reference to.
2164 * drop reference to tile group and free if 0.
2166 void drm_mode_put_tile_group(struct drm_device *dev,
2167 struct drm_tile_group *tg)
2169 kref_put(&tg->refcount, drm_tile_group_free);
2171 EXPORT_SYMBOL(drm_mode_put_tile_group);
2174 * drm_mode_get_tile_group - get a reference to an existing tile group
2176 * @topology: 8-bytes unique per monitor.
2178 * Use the unique bytes to get a reference to an existing tile group.
2181 * tile group or NULL if not found.
2183 struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
2186 struct drm_tile_group *tg;
2188 mutex_lock(&dev->mode_config.idr_mutex);
2189 idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) {
2190 if (!memcmp(tg->group_data, topology, 8)) {
2191 if (!kref_get_unless_zero(&tg->refcount))
2193 mutex_unlock(&dev->mode_config.idr_mutex);
2197 mutex_unlock(&dev->mode_config.idr_mutex);
2200 EXPORT_SYMBOL(drm_mode_get_tile_group);
2203 * drm_mode_create_tile_group - create a tile group from a displayid description
2205 * @topology: 8-bytes unique per monitor.
2207 * Create a tile group for the unique monitor, and get a unique
2208 * identifier for the tile group.
2211 * new tile group or NULL.
2213 struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
2216 struct drm_tile_group *tg;
2219 tg = kzalloc(sizeof(*tg), GFP_KERNEL);
2223 kref_init(&tg->refcount);
2224 memcpy(tg->group_data, topology, 8);
2227 mutex_lock(&dev->mode_config.idr_mutex);
2228 ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL);
2236 mutex_unlock(&dev->mode_config.idr_mutex);
2239 EXPORT_SYMBOL(drm_mode_create_tile_group);