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/drmP.h>
  24#include <drm/drm_connector.h>
  25#include <drm/drm_edid.h>
  26#include <drm/drm_encoder.h>
  27#include <drm/drm_utils.h>
 
 
 
 
 
 
  28
  29#include "drm_crtc_internal.h"
  30#include "drm_internal.h"
  31
  32/**
  33 * DOC: overview
  34 *
  35 * In DRM connectors are the general abstraction for display sinks, and include
  36 * als fixed panels or anything else that can display pixels in some form. As
  37 * opposed to all other KMS objects representing hardware (like CRTC, encoder or
  38 * plane abstractions) connectors can be hotplugged and unplugged at runtime.
  39 * Hence they are reference-counted using drm_connector_get() and
  40 * drm_connector_put().
  41 *
  42 * KMS driver must create, initialize, register and attach at a &struct
  43 * drm_connector for each such sink. The instance is created as other KMS
  44 * objects and initialized by setting the following fields. The connector is
  45 * initialized with a call to drm_connector_init() with a pointer to the
  46 * &struct drm_connector_funcs and a connector type, and then exposed to
  47 * userspace with a call to drm_connector_register().
  48 *
  49 * Connectors must be attached to an encoder to be used. For devices that map
  50 * connectors to encoders 1:1, the connector should be attached at
  51 * initialization time with a call to drm_mode_connector_attach_encoder(). The
  52 * driver must also set the &drm_connector.encoder field to point to the
  53 * attached encoder.
  54 *
  55 * For connectors which are not fixed (like built-in panels) the driver needs to
  56 * support hotplug notifications. The simplest way to do that is by using the
  57 * probe helpers, see drm_kms_helper_poll_init() for connectors which don't have
  58 * hardware support for hotplug interrupts. Connectors with hardware hotplug
  59 * support can instead use e.g. drm_helper_hpd_irq_event().
  60 */
  61
  62struct drm_conn_prop_enum_list {
  63	int type;
  64	const char *name;
  65	struct ida ida;
  66};
  67
  68/*
  69 * Connector and encoder types.
  70 */
  71static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
  72	{ DRM_MODE_CONNECTOR_Unknown, "Unknown" },
  73	{ DRM_MODE_CONNECTOR_VGA, "VGA" },
  74	{ DRM_MODE_CONNECTOR_DVII, "DVI-I" },
  75	{ DRM_MODE_CONNECTOR_DVID, "DVI-D" },
  76	{ DRM_MODE_CONNECTOR_DVIA, "DVI-A" },
  77	{ DRM_MODE_CONNECTOR_Composite, "Composite" },
  78	{ DRM_MODE_CONNECTOR_SVIDEO, "SVIDEO" },
  79	{ DRM_MODE_CONNECTOR_LVDS, "LVDS" },
  80	{ DRM_MODE_CONNECTOR_Component, "Component" },
  81	{ DRM_MODE_CONNECTOR_9PinDIN, "DIN" },
  82	{ DRM_MODE_CONNECTOR_DisplayPort, "DP" },
  83	{ DRM_MODE_CONNECTOR_HDMIA, "HDMI-A" },
  84	{ DRM_MODE_CONNECTOR_HDMIB, "HDMI-B" },
  85	{ DRM_MODE_CONNECTOR_TV, "TV" },
  86	{ DRM_MODE_CONNECTOR_eDP, "eDP" },
  87	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
  88	{ DRM_MODE_CONNECTOR_DSI, "DSI" },
  89	{ DRM_MODE_CONNECTOR_DPI, "DPI" },
 
 
 
  90};
  91
  92void drm_connector_ida_init(void)
  93{
  94	int i;
  95
  96	for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
  97		ida_init(&drm_connector_enum_list[i].ida);
  98}
  99
 100void drm_connector_ida_destroy(void)
 101{
 102	int i;
 103
 104	for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
 105		ida_destroy(&drm_connector_enum_list[i].ida);
 106}
 107
 108/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 109 * drm_connector_get_cmdline_mode - reads the user's cmdline mode
 110 * @connector: connector to quwery
 111 *
 112 * The kernel supports per-connector configuration of its consoles through
 113 * use of the video= parameter. This function parses that option and
 114 * extracts the user's specified mode (or enable/disable status) for a
 115 * particular connector. This is typically only used during the early fbdev
 116 * setup.
 117 */
 118static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
 119{
 120	struct drm_cmdline_mode *mode = &connector->cmdline_mode;
 121	char *option = NULL;
 122
 123	if (fb_get_options(connector->name, &option))
 124		return;
 125
 126	if (!drm_mode_parse_command_line_for_connector(option,
 127						       connector,
 128						       mode))
 129		return;
 130
 131	if (mode->force) {
 132		DRM_INFO("forcing %s connector %s\n", connector->name,
 133			 drm_get_connector_force_name(mode->force));
 134		connector->force = mode->force;
 135	}
 136
 137	DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 138		      connector->name,
 
 
 
 
 
 
 
 139		      mode->xres, mode->yres,
 140		      mode->refresh_specified ? mode->refresh : 60,
 141		      mode->rb ? " reduced blanking" : "",
 142		      mode->margins ? " with margins" : "",
 143		      mode->interlace ?  " interlaced" : "");
 144}
 145
 146static void drm_connector_free(struct kref *kref)
 147{
 148	struct drm_connector *connector =
 149		container_of(kref, struct drm_connector, base.refcount);
 150	struct drm_device *dev = connector->dev;
 151
 152	drm_mode_object_unregister(dev, &connector->base);
 153	connector->funcs->destroy(connector);
 154}
 155
 156void drm_connector_free_work_fn(struct work_struct *work)
 157{
 158	struct drm_connector *connector, *n;
 159	struct drm_device *dev =
 160		container_of(work, struct drm_device, mode_config.connector_free_work);
 161	struct drm_mode_config *config = &dev->mode_config;
 162	unsigned long flags;
 163	struct llist_node *freed;
 164
 165	spin_lock_irqsave(&config->connector_list_lock, flags);
 166	freed = llist_del_all(&config->connector_free_list);
 167	spin_unlock_irqrestore(&config->connector_list_lock, flags);
 168
 169	llist_for_each_entry_safe(connector, n, freed, free_node) {
 170		drm_mode_object_unregister(dev, &connector->base);
 171		connector->funcs->destroy(connector);
 172	}
 173}
 174
 175/**
 176 * drm_connector_init - Init a preallocated connector
 177 * @dev: DRM device
 178 * @connector: the connector to init
 179 * @funcs: callbacks for this connector
 180 * @connector_type: user visible type of the connector
 181 *
 182 * Initialises a preallocated connector. Connectors should be
 183 * subclassed as part of driver connector objects.
 184 *
 185 * Returns:
 186 * Zero on success, error code on failure.
 187 */
 188int drm_connector_init(struct drm_device *dev,
 189		       struct drm_connector *connector,
 190		       const struct drm_connector_funcs *funcs,
 191		       int connector_type)
 192{
 193	struct drm_mode_config *config = &dev->mode_config;
 194	int ret;
 195	struct ida *connector_ida =
 196		&drm_connector_enum_list[connector_type].ida;
 197
 
 
 
 
 198	ret = __drm_mode_object_add(dev, &connector->base,
 199				    DRM_MODE_OBJECT_CONNECTOR,
 200				    false, drm_connector_free);
 201	if (ret)
 202		return ret;
 203
 204	connector->base.properties = &connector->properties;
 205	connector->dev = dev;
 206	connector->funcs = funcs;
 207
 208	/* connector index is used with 32bit bitmasks */
 209	ret = ida_simple_get(&config->connector_ida, 0, 32, GFP_KERNEL);
 210	if (ret < 0) {
 211		DRM_DEBUG_KMS("Failed to allocate %s connector index: %d\n",
 212			      drm_connector_enum_list[connector_type].name,
 213			      ret);
 214		goto out_put;
 215	}
 216	connector->index = ret;
 217	ret = 0;
 218
 219	connector->connector_type = connector_type;
 220	connector->connector_type_id =
 221		ida_simple_get(connector_ida, 1, 0, GFP_KERNEL);
 222	if (connector->connector_type_id < 0) {
 223		ret = connector->connector_type_id;
 224		goto out_put_id;
 225	}
 226	connector->name =
 227		kasprintf(GFP_KERNEL, "%s-%d",
 228			  drm_connector_enum_list[connector_type].name,
 229			  connector->connector_type_id);
 230	if (!connector->name) {
 231		ret = -ENOMEM;
 232		goto out_put_type_id;
 233	}
 234
 235	INIT_LIST_HEAD(&connector->probed_modes);
 236	INIT_LIST_HEAD(&connector->modes);
 237	mutex_init(&connector->mutex);
 238	connector->edid_blob_ptr = NULL;
 
 
 239	connector->status = connector_status_unknown;
 240	connector->display_info.panel_orientation =
 241		DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
 242
 243	drm_connector_get_cmdline_mode(connector);
 244
 245	/* We should add connectors at the end to avoid upsetting the connector
 246	 * index too much. */
 
 247	spin_lock_irq(&config->connector_list_lock);
 248	list_add_tail(&connector->head, &config->connector_list);
 249	config->num_connector++;
 250	spin_unlock_irq(&config->connector_list_lock);
 251
 252	if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL)
 253		drm_object_attach_property(&connector->base,
 254					      config->edid_property,
 255					      0);
 256
 257	drm_object_attach_property(&connector->base,
 258				      config->dpms_property, 0);
 259
 260	drm_object_attach_property(&connector->base,
 261				   config->link_status_property,
 262				   0);
 263
 264	drm_object_attach_property(&connector->base,
 265				   config->non_desktop_property,
 266				   0);
 
 
 
 267
 268	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 269		drm_object_attach_property(&connector->base, config->prop_crtc_id, 0);
 270	}
 271
 272	connector->debugfs_entry = NULL;
 273out_put_type_id:
 274	if (ret)
 275		ida_simple_remove(connector_ida, connector->connector_type_id);
 276out_put_id:
 277	if (ret)
 278		ida_simple_remove(&config->connector_ida, connector->index);
 279out_put:
 280	if (ret)
 281		drm_mode_object_unregister(dev, &connector->base);
 282
 283	return ret;
 284}
 285EXPORT_SYMBOL(drm_connector_init);
 286
 287/**
 288 * drm_mode_connector_attach_encoder - attach a connector to an encoder
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 289 * @connector: connector to attach
 290 * @encoder: encoder to attach @connector to
 291 *
 292 * This function links up a connector to an encoder. Note that the routing
 293 * restrictions between encoders and crtcs are exposed to userspace through the
 294 * possible_clones and possible_crtcs bitmasks.
 295 *
 296 * Returns:
 297 * Zero on success, negative errno on failure.
 298 */
 299int drm_mode_connector_attach_encoder(struct drm_connector *connector,
 300				      struct drm_encoder *encoder)
 301{
 302	int i;
 303
 304	/*
 305	 * In the past, drivers have attempted to model the static association
 306	 * of connector to encoder in simple connector/encoder devices using a
 307	 * direct assignment of connector->encoder = encoder. This connection
 308	 * is a logical one and the responsibility of the core, so drivers are
 309	 * expected not to mess with this.
 310	 *
 311	 * Note that the error return should've been enough here, but a large
 312	 * majority of drivers ignores the return value, so add in a big WARN
 313	 * to get people's attention.
 314	 */
 315	if (WARN_ON(connector->encoder))
 316		return -EINVAL;
 317
 318	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
 319		if (connector->encoder_ids[i] == 0) {
 320			connector->encoder_ids[i] = encoder->base.id;
 321			return 0;
 322		}
 323	}
 324	return -ENOMEM;
 
 
 
 
 
 
 
 
 
 
 
 
 325}
 326EXPORT_SYMBOL(drm_mode_connector_attach_encoder);
 327
 328static void drm_mode_remove(struct drm_connector *connector,
 329			    struct drm_display_mode *mode)
 330{
 331	list_del(&mode->head);
 332	drm_mode_destroy(connector->dev, mode);
 333}
 334
 335/**
 336 * drm_connector_cleanup - cleans up an initialised connector
 337 * @connector: connector to cleanup
 338 *
 339 * Cleans up the connector but doesn't free the object.
 340 */
 341void drm_connector_cleanup(struct drm_connector *connector)
 342{
 343	struct drm_device *dev = connector->dev;
 344	struct drm_display_mode *mode, *t;
 345
 346	/* The connector should have been removed from userspace long before
 347	 * it is finally destroyed.
 348	 */
 349	if (WARN_ON(connector->registered))
 
 350		drm_connector_unregister(connector);
 351
 352	if (connector->tile_group) {
 353		drm_mode_put_tile_group(dev, connector->tile_group);
 354		connector->tile_group = NULL;
 355	}
 356
 357	list_for_each_entry_safe(mode, t, &connector->probed_modes, head)
 358		drm_mode_remove(connector, mode);
 359
 360	list_for_each_entry_safe(mode, t, &connector->modes, head)
 361		drm_mode_remove(connector, mode);
 362
 363	ida_simple_remove(&drm_connector_enum_list[connector->connector_type].ida,
 364			  connector->connector_type_id);
 365
 366	ida_simple_remove(&dev->mode_config.connector_ida,
 367			  connector->index);
 368
 369	kfree(connector->display_info.bus_formats);
 370	drm_mode_object_unregister(dev, &connector->base);
 371	kfree(connector->name);
 372	connector->name = NULL;
 373	spin_lock_irq(&dev->mode_config.connector_list_lock);
 374	list_del(&connector->head);
 375	dev->mode_config.num_connector--;
 376	spin_unlock_irq(&dev->mode_config.connector_list_lock);
 377
 378	WARN_ON(connector->state && !connector->funcs->atomic_destroy_state);
 379	if (connector->state && connector->funcs->atomic_destroy_state)
 380		connector->funcs->atomic_destroy_state(connector,
 381						       connector->state);
 382
 383	mutex_destroy(&connector->mutex);
 384
 385	memset(connector, 0, sizeof(*connector));
 386}
 387EXPORT_SYMBOL(drm_connector_cleanup);
 388
 389/**
 390 * drm_connector_register - register a connector
 391 * @connector: the connector to register
 392 *
 393 * Register userspace interfaces for a connector
 
 
 
 394 *
 395 * Returns:
 396 * Zero on success, error code on failure.
 397 */
 398int drm_connector_register(struct drm_connector *connector)
 399{
 400	int ret = 0;
 401
 402	if (!connector->dev->registered)
 403		return 0;
 404
 405	mutex_lock(&connector->mutex);
 406	if (connector->registered)
 407		goto unlock;
 408
 409	ret = drm_sysfs_connector_add(connector);
 410	if (ret)
 411		goto unlock;
 412
 413	ret = drm_debugfs_connector_add(connector);
 414	if (ret) {
 415		goto err_sysfs;
 416	}
 417
 418	if (connector->funcs->late_register) {
 419		ret = connector->funcs->late_register(connector);
 420		if (ret)
 421			goto err_debugfs;
 422	}
 423
 424	drm_mode_object_register(connector->dev, &connector->base);
 425
 426	connector->registered = true;
 
 
 
 
 427	goto unlock;
 428
 429err_debugfs:
 430	drm_debugfs_connector_remove(connector);
 431err_sysfs:
 432	drm_sysfs_connector_remove(connector);
 433unlock:
 434	mutex_unlock(&connector->mutex);
 435	return ret;
 436}
 437EXPORT_SYMBOL(drm_connector_register);
 438
 439/**
 440 * drm_connector_unregister - unregister a connector
 441 * @connector: the connector to unregister
 442 *
 443 * Unregister userspace interfaces for a connector
 
 
 
 444 */
 445void drm_connector_unregister(struct drm_connector *connector)
 446{
 447	mutex_lock(&connector->mutex);
 448	if (!connector->registered) {
 449		mutex_unlock(&connector->mutex);
 450		return;
 451	}
 452
 453	if (connector->funcs->early_unregister)
 454		connector->funcs->early_unregister(connector);
 455
 456	drm_sysfs_connector_remove(connector);
 457	drm_debugfs_connector_remove(connector);
 458
 459	connector->registered = false;
 460	mutex_unlock(&connector->mutex);
 461}
 462EXPORT_SYMBOL(drm_connector_unregister);
 463
 464void drm_connector_unregister_all(struct drm_device *dev)
 465{
 466	struct drm_connector *connector;
 467	struct drm_connector_list_iter conn_iter;
 468
 469	drm_connector_list_iter_begin(dev, &conn_iter);
 470	drm_for_each_connector_iter(connector, &conn_iter)
 471		drm_connector_unregister(connector);
 472	drm_connector_list_iter_end(&conn_iter);
 473}
 474
 475int drm_connector_register_all(struct drm_device *dev)
 476{
 477	struct drm_connector *connector;
 478	struct drm_connector_list_iter conn_iter;
 479	int ret = 0;
 480
 481	drm_connector_list_iter_begin(dev, &conn_iter);
 482	drm_for_each_connector_iter(connector, &conn_iter) {
 483		ret = drm_connector_register(connector);
 484		if (ret)
 485			break;
 486	}
 487	drm_connector_list_iter_end(&conn_iter);
 488
 489	if (ret)
 490		drm_connector_unregister_all(dev);
 491	return ret;
 492}
 493
 494/**
 495 * drm_get_connector_status_name - return a string for connector status
 496 * @status: connector status to compute name of
 497 *
 498 * In contrast to the other drm_get_*_name functions this one here returns a
 499 * const pointer and hence is threadsafe.
 500 */
 501const char *drm_get_connector_status_name(enum drm_connector_status status)
 502{
 503	if (status == connector_status_connected)
 504		return "connected";
 505	else if (status == connector_status_disconnected)
 506		return "disconnected";
 507	else
 508		return "unknown";
 509}
 510EXPORT_SYMBOL(drm_get_connector_status_name);
 511
 512/**
 513 * drm_get_connector_force_name - return a string for connector force
 514 * @force: connector force to get name of
 515 *
 516 * Returns: const pointer to name.
 517 */
 518const char *drm_get_connector_force_name(enum drm_connector_force force)
 519{
 520	switch (force) {
 521	case DRM_FORCE_UNSPECIFIED:
 522		return "unspecified";
 523	case DRM_FORCE_OFF:
 524		return "off";
 525	case DRM_FORCE_ON:
 526		return "on";
 527	case DRM_FORCE_ON_DIGITAL:
 528		return "digital";
 529	default:
 530		return "unknown";
 531	}
 532}
 533
 534#ifdef CONFIG_LOCKDEP
 535static struct lockdep_map connector_list_iter_dep_map = {
 536	.name = "drm_connector_list_iter"
 537};
 538#endif
 539
 540/**
 541 * drm_connector_list_iter_begin - initialize a connector_list iterator
 542 * @dev: DRM device
 543 * @iter: connector_list iterator
 544 *
 545 * Sets @iter up to walk the &drm_mode_config.connector_list of @dev. @iter
 546 * must always be cleaned up again by calling drm_connector_list_iter_end().
 547 * Iteration itself happens using drm_connector_list_iter_next() or
 548 * drm_for_each_connector_iter().
 549 */
 550void drm_connector_list_iter_begin(struct drm_device *dev,
 551				   struct drm_connector_list_iter *iter)
 552{
 553	iter->dev = dev;
 554	iter->conn = NULL;
 555	lock_acquire_shared_recursive(&connector_list_iter_dep_map, 0, 1, NULL, _RET_IP_);
 556}
 557EXPORT_SYMBOL(drm_connector_list_iter_begin);
 558
 559/*
 560 * Extra-safe connector put function that works in any context. Should only be
 561 * used from the connector_iter functions, where we never really expect to
 562 * actually release the connector when dropping our final reference.
 563 */
 564static void
 565__drm_connector_put_safe(struct drm_connector *conn)
 566{
 567	struct drm_mode_config *config = &conn->dev->mode_config;
 568
 569	lockdep_assert_held(&config->connector_list_lock);
 570
 571	if (!refcount_dec_and_test(&conn->base.refcount.refcount))
 572		return;
 573
 574	llist_add(&conn->free_node, &config->connector_free_list);
 575	schedule_work(&config->connector_free_work);
 576}
 577
 578/**
 579 * drm_connector_list_iter_next - return next connector
 580 * @iter: connectr_list iterator
 581 *
 582 * Returns the next connector for @iter, or NULL when the list walk has
 583 * completed.
 584 */
 585struct drm_connector *
 586drm_connector_list_iter_next(struct drm_connector_list_iter *iter)
 587{
 588	struct drm_connector *old_conn = iter->conn;
 589	struct drm_mode_config *config = &iter->dev->mode_config;
 590	struct list_head *lhead;
 591	unsigned long flags;
 592
 593	spin_lock_irqsave(&config->connector_list_lock, flags);
 594	lhead = old_conn ? &old_conn->head : &config->connector_list;
 595
 596	do {
 597		if (lhead->next == &config->connector_list) {
 598			iter->conn = NULL;
 599			break;
 600		}
 601
 602		lhead = lhead->next;
 603		iter->conn = list_entry(lhead, struct drm_connector, head);
 604
 605		/* loop until it's not a zombie connector */
 606	} while (!kref_get_unless_zero(&iter->conn->base.refcount));
 607
 608	if (old_conn)
 609		__drm_connector_put_safe(old_conn);
 610	spin_unlock_irqrestore(&config->connector_list_lock, flags);
 611
 612	return iter->conn;
 613}
 614EXPORT_SYMBOL(drm_connector_list_iter_next);
 615
 616/**
 617 * drm_connector_list_iter_end - tear down a connector_list iterator
 618 * @iter: connector_list iterator
 619 *
 620 * Tears down @iter and releases any resources (like &drm_connector references)
 621 * acquired while walking the list. This must always be called, both when the
 622 * iteration completes fully or when it was aborted without walking the entire
 623 * list.
 624 */
 625void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
 626{
 627	struct drm_mode_config *config = &iter->dev->mode_config;
 628	unsigned long flags;
 629
 630	iter->dev = NULL;
 631	if (iter->conn) {
 632		spin_lock_irqsave(&config->connector_list_lock, flags);
 633		__drm_connector_put_safe(iter->conn);
 634		spin_unlock_irqrestore(&config->connector_list_lock, flags);
 635	}
 636	lock_release(&connector_list_iter_dep_map, 0, _RET_IP_);
 637}
 638EXPORT_SYMBOL(drm_connector_list_iter_end);
 639
 640static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
 641	{ SubPixelUnknown, "Unknown" },
 642	{ SubPixelHorizontalRGB, "Horizontal RGB" },
 643	{ SubPixelHorizontalBGR, "Horizontal BGR" },
 644	{ SubPixelVerticalRGB, "Vertical RGB" },
 645	{ SubPixelVerticalBGR, "Vertical BGR" },
 646	{ SubPixelNone, "None" },
 647};
 648
 649/**
 650 * drm_get_subpixel_order_name - return a string for a given subpixel enum
 651 * @order: enum of subpixel_order
 652 *
 653 * Note you could abuse this and return something out of bounds, but that
 654 * would be a caller error.  No unscrubbed user data should make it here.
 655 */
 656const char *drm_get_subpixel_order_name(enum subpixel_order order)
 657{
 658	return drm_subpixel_enum_list[order].name;
 659}
 660EXPORT_SYMBOL(drm_get_subpixel_order_name);
 661
 662static const struct drm_prop_enum_list drm_dpms_enum_list[] = {
 663	{ DRM_MODE_DPMS_ON, "On" },
 664	{ DRM_MODE_DPMS_STANDBY, "Standby" },
 665	{ DRM_MODE_DPMS_SUSPEND, "Suspend" },
 666	{ DRM_MODE_DPMS_OFF, "Off" }
 667};
 668DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)
 669
 670static const struct drm_prop_enum_list drm_link_status_enum_list[] = {
 671	{ DRM_MODE_LINK_STATUS_GOOD, "Good" },
 672	{ DRM_MODE_LINK_STATUS_BAD, "Bad" },
 673};
 674
 675/**
 676 * drm_display_info_set_bus_formats - set the supported bus formats
 677 * @info: display info to store bus formats in
 678 * @formats: array containing the supported bus formats
 679 * @num_formats: the number of entries in the fmts array
 680 *
 681 * Store the supported bus formats in display info structure.
 682 * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
 683 * a full list of available formats.
 684 */
 685int drm_display_info_set_bus_formats(struct drm_display_info *info,
 686				     const u32 *formats,
 687				     unsigned int num_formats)
 688{
 689	u32 *fmts = NULL;
 690
 691	if (!formats && num_formats)
 692		return -EINVAL;
 693
 694	if (formats && num_formats) {
 695		fmts = kmemdup(formats, sizeof(*formats) * num_formats,
 696			       GFP_KERNEL);
 697		if (!fmts)
 698			return -ENOMEM;
 699	}
 700
 701	kfree(info->bus_formats);
 702	info->bus_formats = fmts;
 703	info->num_bus_formats = num_formats;
 704
 705	return 0;
 706}
 707EXPORT_SYMBOL(drm_display_info_set_bus_formats);
 708
 709/* Optional connector properties. */
 710static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = {
 711	{ DRM_MODE_SCALE_NONE, "None" },
 712	{ DRM_MODE_SCALE_FULLSCREEN, "Full" },
 713	{ DRM_MODE_SCALE_CENTER, "Center" },
 714	{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
 715};
 716
 717static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
 718	{ DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
 719	{ DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
 720	{ DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
 721};
 722
 
 
 
 
 
 
 
 
 723static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = {
 724	{ DRM_MODE_PANEL_ORIENTATION_NORMAL,	"Normal"	},
 725	{ DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP,	"Upside Down"	},
 726	{ DRM_MODE_PANEL_ORIENTATION_LEFT_UP,	"Left Side Up"	},
 727	{ DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,	"Right Side Up"	},
 728};
 729
 730static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = {
 731	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
 732	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
 733	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
 734};
 735DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)
 736
 737static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = {
 738	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
 739	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
 740	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
 741};
 742DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
 743		 drm_dvi_i_subconnector_enum_list)
 744
 745static const struct drm_prop_enum_list drm_tv_select_enum_list[] = {
 746	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
 747	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
 748	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
 749	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
 750	{ DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
 751};
 752DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)
 753
 754static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
 755	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
 756	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
 757	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
 758	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
 759	{ DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
 760};
 761DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
 762		 drm_tv_subconnector_enum_list)
 763
 764static struct drm_prop_enum_list drm_cp_enum_list[] = {
 765	{ DRM_MODE_CONTENT_PROTECTION_UNDESIRED, "Undesired" },
 766	{ DRM_MODE_CONTENT_PROTECTION_DESIRED, "Desired" },
 767	{ DRM_MODE_CONTENT_PROTECTION_ENABLED, "Enabled" },
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 768};
 769DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list)
 770
 771/**
 772 * DOC: standard connector properties
 773 *
 774 * DRM connectors have a few standardized properties:
 775 *
 776 * EDID:
 777 * 	Blob property which contains the current EDID read from the sink. This
 778 * 	is useful to parse sink identification information like vendor, model
 779 * 	and serial. Drivers should update this property by calling
 780 * 	drm_mode_connector_update_edid_property(), usually after having parsed
 781 * 	the EDID using drm_add_edid_modes(). Userspace cannot change this
 782 * 	property.
 
 
 
 
 
 783 * DPMS:
 784 * 	Legacy property for setting the power state of the connector. For atomic
 785 * 	drivers this is only provided for backwards compatibility with existing
 786 * 	drivers, it remaps to controlling the "ACTIVE" property on the CRTC the
 787 * 	connector is linked to. Drivers should never set this property directly,
 788 * 	it is handled by the DRM core by calling the &drm_connector_funcs.dpms
 789 * 	callback. For atomic drivers the remapping to the "ACTIVE" property is
 790 * 	implemented in the DRM core.  This is the only standard connector
 791 * 	property that userspace can change.
 792 *
 793 * 	Note that this property cannot be set through the MODE_ATOMIC ioctl,
 794 * 	userspace must use "ACTIVE" on the CRTC instead.
 795 *
 796 * 	WARNING:
 797 *
 798 * 	For userspace also running on legacy drivers the "DPMS" semantics are a
 799 * 	lot more complicated. First, userspace cannot rely on the "DPMS" value
 800 * 	returned by the GETCONNECTOR actually reflecting reality, because many
 801 * 	drivers fail to update it. For atomic drivers this is taken care of in
 802 * 	drm_atomic_helper_update_legacy_modeset_state().
 803 *
 804 * 	The second issue is that the DPMS state is only well-defined when the
 805 * 	connector is connected to a CRTC. In atomic the DRM core enforces that
 806 * 	"ACTIVE" is off in such a case, no such checks exists for "DPMS".
 807 *
 808 * 	Finally, when enabling an output using the legacy SETCONFIG ioctl then
 809 * 	"DPMS" is forced to ON. But see above, that might not be reflected in
 810 * 	the software value on legacy drivers.
 811 *
 812 * 	Summarizing: Only set "DPMS" when the connector is known to be enabled,
 813 * 	assume that a successful SETCONFIG call also sets "DPMS" to on, and
 814 * 	never read back the value of "DPMS" because it can be incorrect.
 815 * PATH:
 816 * 	Connector path property to identify how this sink is physically
 817 * 	connected. Used by DP MST. This should be set by calling
 818 * 	drm_mode_connector_set_path_property(), in the case of DP MST with the
 819 * 	path property the MST manager created. Userspace cannot change this
 820 * 	property.
 821 * TILE:
 822 * 	Connector tile group property to indicate how a set of DRM connector
 823 * 	compose together into one logical screen. This is used by both high-res
 824 * 	external screens (often only using a single cable, but exposing multiple
 825 * 	DP MST sinks), or high-res integrated panels (like dual-link DSI) which
 826 * 	are not gen-locked. Note that for tiled panels which are genlocked, like
 827 * 	dual-link LVDS or dual-link DSI, the driver should try to not expose the
 828 * 	tiling and virtualize both &drm_crtc and &drm_plane if needed. Drivers
 829 * 	should update this value using drm_mode_connector_set_tile_property().
 830 * 	Userspace cannot change this property.
 831 * link-status:
 832 *      Connector link-status property to indicate the status of link. The
 833 *      default value of link-status is "GOOD". If something fails during or
 834 *      after modeset, the kernel driver may set this to "BAD" and issue a
 835 *      hotplug uevent. Drivers should update this value using
 836 *      drm_mode_connector_set_link_status_property().
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 837 * non_desktop:
 838 * 	Indicates the output should be ignored for purposes of displaying a
 839 * 	standard desktop environment or console. This is most likely because
 840 * 	the output device is not rectilinear.
 841 * Content Protection:
 842 *	This property is used by userspace to request the kernel protect future
 843 *	content communicated over the link. When requested, kernel will apply
 844 *	the appropriate means of protection (most often HDCP), and use the
 845 *	property to tell userspace the protection is active.
 846 *
 847 *	Drivers can set this up by calling
 848 *	drm_connector_attach_content_protection_property() on initialization.
 849 *
 850 *	The value of this property can be one of the following:
 851 *
 852 *	DRM_MODE_CONTENT_PROTECTION_UNDESIRED = 0
 853 *		The link is not protected, content is transmitted in the clear.
 854 *	DRM_MODE_CONTENT_PROTECTION_DESIRED = 1
 855 *		Userspace has requested content protection, but the link is not
 856 *		currently protected. When in this state, kernel should enable
 857 *		Content Protection as soon as possible.
 858 *	DRM_MODE_CONTENT_PROTECTION_ENABLED = 2
 859 *		Userspace has requested content protection, and the link is
 860 *		protected. Only the driver can set the property to this value.
 861 *		If userspace attempts to set to ENABLED, kernel will return
 862 *		-EINVAL.
 863 *
 864 *	A few guidelines:
 865 *
 866 *	- DESIRED state should be preserved until userspace de-asserts it by
 867 *	  setting the property to UNDESIRED. This means ENABLED should only
 868 *	  transition to UNDESIRED when the user explicitly requests it.
 869 *	- If the state is DESIRED, kernel should attempt to re-authenticate the
 870 *	  link whenever possible. This includes across disable/enable, dpms,
 871 *	  hotplug, downstream device changes, link status failures, etc..
 872 *	- Userspace is responsible for polling the property to determine when
 873 *	  the value transitions from ENABLED to DESIRED. This signifies the link
 874 *	  is no longer protected and userspace should take appropriate action
 875 *	  (whatever that might be).
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 876 *
 877 * Connectors also have one standardized atomic property:
 878 *
 879 * CRTC_ID:
 880 * 	Mode object ID of the &drm_crtc this connector should be connected to.
 881 *
 882 * Connectors for LCD panels may also have one standardized property:
 883 *
 884 * panel orientation:
 885 *	On some devices the LCD panel is mounted in the casing in such a way
 886 *	that the up/top side of the panel does not match with the top side of
 887 *	the device. Userspace can use this property to check for this.
 888 *	Note that input coordinates from touchscreens (input devices with
 889 *	INPUT_PROP_DIRECT) will still map 1:1 to the actual LCD panel
 890 *	coordinates, so if userspace rotates the picture to adjust for
 891 *	the orientation it must also apply the same transformation to the
 892 *	touchscreen input coordinates. This property is initialized by calling
 893 *	drm_connector_init_panel_orientation_property().
 
 894 *
 895 * scaling mode:
 896 *	This property defines how a non-native mode is upscaled to the native
 897 *	mode of an LCD panel:
 898 *
 899 *	None:
 900 *		No upscaling happens, scaling is left to the panel. Not all
 901 *		drivers expose this mode.
 902 *	Full:
 903 *		The output is upscaled to the full resolution of the panel,
 904 *		ignoring the aspect ratio.
 905 *	Center:
 906 *		No upscaling happens, the output is centered within the native
 907 *		resolution the panel.
 908 *	Full aspect:
 909 *		The output is upscaled to maximize either the width or height
 910 *		while retaining the aspect ratio.
 911 *
 912 *	This property should be set up by calling
 913 *	drm_connector_attach_scaling_mode_property(). Note that drivers
 914 *	can also expose this property to external outputs, in which case they
 915 *	must support "None", which should be the default (since external screens
 916 *	have a built-in scaler).
 
 
 
 
 
 
 
 
 917 */
 918
 919int drm_connector_create_standard_properties(struct drm_device *dev)
 920{
 921	struct drm_property *prop;
 922
 923	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB |
 924				   DRM_MODE_PROP_IMMUTABLE,
 925				   "EDID", 0);
 926	if (!prop)
 927		return -ENOMEM;
 928	dev->mode_config.edid_property = prop;
 929
 930	prop = drm_property_create_enum(dev, 0,
 931				   "DPMS", drm_dpms_enum_list,
 932				   ARRAY_SIZE(drm_dpms_enum_list));
 933	if (!prop)
 934		return -ENOMEM;
 935	dev->mode_config.dpms_property = prop;
 936
 937	prop = drm_property_create(dev,
 938				   DRM_MODE_PROP_BLOB |
 939				   DRM_MODE_PROP_IMMUTABLE,
 940				   "PATH", 0);
 941	if (!prop)
 942		return -ENOMEM;
 943	dev->mode_config.path_property = prop;
 944
 945	prop = drm_property_create(dev,
 946				   DRM_MODE_PROP_BLOB |
 947				   DRM_MODE_PROP_IMMUTABLE,
 948				   "TILE", 0);
 949	if (!prop)
 950		return -ENOMEM;
 951	dev->mode_config.tile_property = prop;
 952
 953	prop = drm_property_create_enum(dev, 0, "link-status",
 954					drm_link_status_enum_list,
 955					ARRAY_SIZE(drm_link_status_enum_list));
 956	if (!prop)
 957		return -ENOMEM;
 958	dev->mode_config.link_status_property = prop;
 959
 960	prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE, "non-desktop");
 961	if (!prop)
 962		return -ENOMEM;
 963	dev->mode_config.non_desktop_property = prop;
 964
 
 
 
 
 
 
 965	return 0;
 966}
 967
 968/**
 969 * drm_mode_create_dvi_i_properties - create DVI-I specific connector properties
 970 * @dev: DRM device
 971 *
 972 * Called by a driver the first time a DVI-I connector is made.
 973 */
 974int drm_mode_create_dvi_i_properties(struct drm_device *dev)
 975{
 976	struct drm_property *dvi_i_selector;
 977	struct drm_property *dvi_i_subconnector;
 978
 979	if (dev->mode_config.dvi_i_select_subconnector_property)
 980		return 0;
 981
 982	dvi_i_selector =
 983		drm_property_create_enum(dev, 0,
 984				    "select subconnector",
 985				    drm_dvi_i_select_enum_list,
 986				    ARRAY_SIZE(drm_dvi_i_select_enum_list));
 987	dev->mode_config.dvi_i_select_subconnector_property = dvi_i_selector;
 988
 989	dvi_i_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
 990				    "subconnector",
 991				    drm_dvi_i_subconnector_enum_list,
 992				    ARRAY_SIZE(drm_dvi_i_subconnector_enum_list));
 993	dev->mode_config.dvi_i_subconnector_property = dvi_i_subconnector;
 994
 995	return 0;
 996}
 997EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);
 998
 999/**
1000 * drm_create_tv_properties - create TV specific connector properties
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1001 * @dev: DRM device
1002 * @num_modes: number of different TV formats (modes) supported
1003 * @modes: array of pointers to strings containing name of each format
1004 *
1005 * Called by a driver's TV initialization routine, this function creates
1006 * the TV specific connector properties for a given device.  Caller is
1007 * responsible for allocating a list of format names and passing them to
1008 * this routine.
1009 */
1010int drm_mode_create_tv_properties(struct drm_device *dev,
1011				  unsigned int num_modes,
1012				  const char * const modes[])
1013{
1014	struct drm_property *tv_selector;
1015	struct drm_property *tv_subconnector;
1016	unsigned int i;
1017
1018	if (dev->mode_config.tv_select_subconnector_property)
1019		return 0;
1020
1021	/*
1022	 * Basic connector properties
1023	 */
1024	tv_selector = drm_property_create_enum(dev, 0,
1025					  "select subconnector",
1026					  drm_tv_select_enum_list,
1027					  ARRAY_SIZE(drm_tv_select_enum_list));
1028	if (!tv_selector)
1029		goto nomem;
1030
1031	dev->mode_config.tv_select_subconnector_property = tv_selector;
1032
1033	tv_subconnector =
1034		drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
1035				    "subconnector",
1036				    drm_tv_subconnector_enum_list,
1037				    ARRAY_SIZE(drm_tv_subconnector_enum_list));
1038	if (!tv_subconnector)
1039		goto nomem;
1040	dev->mode_config.tv_subconnector_property = tv_subconnector;
1041
1042	/*
1043	 * Other, TV specific properties: margins & TV modes.
1044	 */
1045	dev->mode_config.tv_left_margin_property =
1046		drm_property_create_range(dev, 0, "left margin", 0, 100);
1047	if (!dev->mode_config.tv_left_margin_property)
1048		goto nomem;
1049
1050	dev->mode_config.tv_right_margin_property =
1051		drm_property_create_range(dev, 0, "right margin", 0, 100);
1052	if (!dev->mode_config.tv_right_margin_property)
1053		goto nomem;
1054
1055	dev->mode_config.tv_top_margin_property =
1056		drm_property_create_range(dev, 0, "top margin", 0, 100);
1057	if (!dev->mode_config.tv_top_margin_property)
1058		goto nomem;
1059
1060	dev->mode_config.tv_bottom_margin_property =
1061		drm_property_create_range(dev, 0, "bottom margin", 0, 100);
1062	if (!dev->mode_config.tv_bottom_margin_property)
1063		goto nomem;
1064
1065	dev->mode_config.tv_mode_property =
1066		drm_property_create(dev, DRM_MODE_PROP_ENUM,
1067				    "mode", num_modes);
1068	if (!dev->mode_config.tv_mode_property)
1069		goto nomem;
1070
1071	for (i = 0; i < num_modes; i++)
1072		drm_property_add_enum(dev->mode_config.tv_mode_property, i,
1073				      i, modes[i]);
1074
1075	dev->mode_config.tv_brightness_property =
1076		drm_property_create_range(dev, 0, "brightness", 0, 100);
1077	if (!dev->mode_config.tv_brightness_property)
1078		goto nomem;
1079
1080	dev->mode_config.tv_contrast_property =
1081		drm_property_create_range(dev, 0, "contrast", 0, 100);
1082	if (!dev->mode_config.tv_contrast_property)
1083		goto nomem;
1084
1085	dev->mode_config.tv_flicker_reduction_property =
1086		drm_property_create_range(dev, 0, "flicker reduction", 0, 100);
1087	if (!dev->mode_config.tv_flicker_reduction_property)
1088		goto nomem;
1089
1090	dev->mode_config.tv_overscan_property =
1091		drm_property_create_range(dev, 0, "overscan", 0, 100);
1092	if (!dev->mode_config.tv_overscan_property)
1093		goto nomem;
1094
1095	dev->mode_config.tv_saturation_property =
1096		drm_property_create_range(dev, 0, "saturation", 0, 100);
1097	if (!dev->mode_config.tv_saturation_property)
1098		goto nomem;
1099
1100	dev->mode_config.tv_hue_property =
1101		drm_property_create_range(dev, 0, "hue", 0, 100);
1102	if (!dev->mode_config.tv_hue_property)
1103		goto nomem;
1104
1105	return 0;
1106nomem:
1107	return -ENOMEM;
1108}
1109EXPORT_SYMBOL(drm_mode_create_tv_properties);
1110
1111/**
1112 * drm_mode_create_scaling_mode_property - create scaling mode property
1113 * @dev: DRM device
1114 *
1115 * Called by a driver the first time it's needed, must be attached to desired
1116 * connectors.
1117 *
1118 * Atomic drivers should use drm_connector_attach_scaling_mode_property()
1119 * instead to correctly assign &drm_connector_state.picture_aspect_ratio
1120 * in the atomic state.
1121 */
1122int drm_mode_create_scaling_mode_property(struct drm_device *dev)
1123{
1124	struct drm_property *scaling_mode;
1125
1126	if (dev->mode_config.scaling_mode_property)
1127		return 0;
1128
1129	scaling_mode =
1130		drm_property_create_enum(dev, 0, "scaling mode",
1131				drm_scaling_mode_enum_list,
1132				    ARRAY_SIZE(drm_scaling_mode_enum_list));
1133
1134	dev->mode_config.scaling_mode_property = scaling_mode;
1135
1136	return 0;
1137}
1138EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
1139
1140/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1141 * drm_connector_attach_scaling_mode_property - attach atomic scaling mode property
1142 * @connector: connector to attach scaling mode property on.
1143 * @scaling_mode_mask: or'ed mask of BIT(%DRM_MODE_SCALE_\*).
1144 *
1145 * This is used to add support for scaling mode to atomic drivers.
1146 * The scaling mode will be set to &drm_connector_state.picture_aspect_ratio
1147 * and can be used from &drm_connector_helper_funcs->atomic_check for validation.
1148 *
1149 * This is the atomic version of drm_mode_create_scaling_mode_property().
1150 *
1151 * Returns:
1152 * Zero on success, negative errno on failure.
1153 */
1154int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
1155					       u32 scaling_mode_mask)
1156{
1157	struct drm_device *dev = connector->dev;
1158	struct drm_property *scaling_mode_property;
1159	int i, j = 0;
1160	const unsigned valid_scaling_mode_mask =
1161		(1U << ARRAY_SIZE(drm_scaling_mode_enum_list)) - 1;
1162
1163	if (WARN_ON(hweight32(scaling_mode_mask) < 2 ||
1164		    scaling_mode_mask & ~valid_scaling_mode_mask))
1165		return -EINVAL;
1166
1167	scaling_mode_property =
1168		drm_property_create(dev, DRM_MODE_PROP_ENUM, "scaling mode",
1169				    hweight32(scaling_mode_mask));
1170
1171	if (!scaling_mode_property)
1172		return -ENOMEM;
1173
1174	for (i = 0; i < ARRAY_SIZE(drm_scaling_mode_enum_list); i++) {
1175		int ret;
1176
1177		if (!(BIT(i) & scaling_mode_mask))
1178			continue;
1179
1180		ret = drm_property_add_enum(scaling_mode_property, j++,
1181					    drm_scaling_mode_enum_list[i].type,
1182					    drm_scaling_mode_enum_list[i].name);
1183
1184		if (ret) {
1185			drm_property_destroy(dev, scaling_mode_property);
1186
1187			return ret;
1188		}
1189	}
1190
1191	drm_object_attach_property(&connector->base,
1192				   scaling_mode_property, 0);
1193
1194	connector->scaling_mode_property = scaling_mode_property;
1195
1196	return 0;
1197}
1198EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property);
1199
1200/**
1201 * drm_connector_attach_content_protection_property - attach content protection
1202 * property
 
 
 
1203 *
1204 * @connector: connector to attach CP property on.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1205 *
1206 * This is used to add support for content protection on select connectors.
1207 * Content Protection is intentionally vague to allow for different underlying
1208 * technologies, however it is most implemented by HDCP.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1209 *
1210 * The content protection will be set to &drm_connector_state.content_protection
 
1211 *
1212 * Returns:
1213 * Zero on success, negative errno on failure.
1214 */
1215int drm_connector_attach_content_protection_property(
1216		struct drm_connector *connector)
1217{
1218	struct drm_device *dev = connector->dev;
1219	struct drm_property *prop;
1220
1221	prop = drm_property_create_enum(dev, 0, "Content Protection",
1222					drm_cp_enum_list,
1223					ARRAY_SIZE(drm_cp_enum_list));
1224	if (!prop)
 
 
 
 
 
1225		return -ENOMEM;
1226
1227	drm_object_attach_property(&connector->base, prop,
1228				   DRM_MODE_CONTENT_PROTECTION_UNDESIRED);
 
1229
1230	connector->content_protection_property = prop;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1231
1232	return 0;
1233}
1234EXPORT_SYMBOL(drm_connector_attach_content_protection_property);
1235
1236/**
1237 * drm_mode_create_aspect_ratio_property - create aspect ratio property
1238 * @dev: DRM device
1239 *
1240 * Called by a driver the first time it's needed, must be attached to desired
1241 * connectors.
1242 *
1243 * Returns:
1244 * Zero on success, negative errno on failure.
1245 */
1246int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
1247{
1248	if (dev->mode_config.aspect_ratio_property)
1249		return 0;
1250
1251	dev->mode_config.aspect_ratio_property =
1252		drm_property_create_enum(dev, 0, "aspect ratio",
1253				drm_aspect_ratio_enum_list,
1254				ARRAY_SIZE(drm_aspect_ratio_enum_list));
1255
1256	if (dev->mode_config.aspect_ratio_property == NULL)
1257		return -ENOMEM;
1258
1259	return 0;
1260}
1261EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);
1262
1263/**
1264 * drm_mode_create_suggested_offset_properties - create suggests offset properties
1265 * @dev: DRM device
1266 *
1267 * Create the the suggested x/y offset property for connectors.
1268 */
1269int drm_mode_create_suggested_offset_properties(struct drm_device *dev)
1270{
1271	if (dev->mode_config.suggested_x_property && dev->mode_config.suggested_y_property)
1272		return 0;
1273
1274	dev->mode_config.suggested_x_property =
1275		drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested X", 0, 0xffffffff);
1276
1277	dev->mode_config.suggested_y_property =
1278		drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested Y", 0, 0xffffffff);
1279
1280	if (dev->mode_config.suggested_x_property == NULL ||
1281	    dev->mode_config.suggested_y_property == NULL)
1282		return -ENOMEM;
1283	return 0;
1284}
1285EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties);
1286
1287/**
1288 * drm_mode_connector_set_path_property - set tile property on connector
1289 * @connector: connector to set property on.
1290 * @path: path to use for property; must not be NULL.
1291 *
1292 * This creates a property to expose to userspace to specify a
1293 * connector path. This is mainly used for DisplayPort MST where
1294 * connectors have a topology and we want to allow userspace to give
1295 * them more meaningful names.
1296 *
1297 * Returns:
1298 * Zero on success, negative errno on failure.
1299 */
1300int drm_mode_connector_set_path_property(struct drm_connector *connector,
1301					 const char *path)
1302{
1303	struct drm_device *dev = connector->dev;
1304	int ret;
1305
1306	ret = drm_property_replace_global_blob(dev,
1307	                                       &connector->path_blob_ptr,
1308	                                       strlen(path) + 1,
1309	                                       path,
1310	                                       &connector->base,
1311	                                       dev->mode_config.path_property);
1312	return ret;
1313}
1314EXPORT_SYMBOL(drm_mode_connector_set_path_property);
1315
1316/**
1317 * drm_mode_connector_set_tile_property - set tile property on connector
1318 * @connector: connector to set property on.
1319 *
1320 * This looks up the tile information for a connector, and creates a
1321 * property for userspace to parse if it exists. The property is of
1322 * the form of 8 integers using ':' as a separator.
 
 
1323 *
1324 * Returns:
1325 * Zero on success, errno on failure.
1326 */
1327int drm_mode_connector_set_tile_property(struct drm_connector *connector)
1328{
1329	struct drm_device *dev = connector->dev;
1330	char tile[256];
1331	int ret;
1332
1333	if (!connector->has_tile) {
1334		ret  = drm_property_replace_global_blob(dev,
1335		                                        &connector->tile_blob_ptr,
1336		                                        0,
1337		                                        NULL,
1338		                                        &connector->base,
1339		                                        dev->mode_config.tile_property);
1340		return ret;
1341	}
1342
1343	snprintf(tile, 256, "%d:%d:%d:%d:%d:%d:%d:%d",
1344		 connector->tile_group->id, connector->tile_is_single_monitor,
1345		 connector->num_h_tile, connector->num_v_tile,
1346		 connector->tile_h_loc, connector->tile_v_loc,
1347		 connector->tile_h_size, connector->tile_v_size);
1348
1349	ret = drm_property_replace_global_blob(dev,
1350	                                       &connector->tile_blob_ptr,
1351	                                       strlen(tile) + 1,
1352	                                       tile,
1353	                                       &connector->base,
1354	                                       dev->mode_config.tile_property);
1355	return ret;
1356}
1357EXPORT_SYMBOL(drm_mode_connector_set_tile_property);
1358
1359/**
1360 * drm_mode_connector_update_edid_property - update the edid property of a connector
1361 * @connector: drm connector
1362 * @edid: new value of the edid property
1363 *
1364 * This function creates a new blob modeset object and assigns its id to the
1365 * connector's edid property.
 
 
 
1366 *
1367 * Returns:
1368 * Zero on success, negative errno on failure.
1369 */
1370int drm_mode_connector_update_edid_property(struct drm_connector *connector,
1371					    const struct edid *edid)
1372{
1373	struct drm_device *dev = connector->dev;
1374	size_t size = 0;
1375	int ret;
 
1376
1377	/* ignore requests to set edid when overridden */
1378	if (connector->override_edid)
1379		return 0;
1380
1381	if (edid)
1382		size = EDID_LENGTH * (1 + edid->extensions);
1383
1384	/* Set the display info, using edid if available, otherwise
1385	 * reseting the values to defaults. This duplicates the work
1386	 * done in drm_add_edid_modes, but that function is not
1387	 * consistently called before this one in all drivers and the
1388	 * computation is cheap enough that it seems better to
1389	 * duplicate it rather than attempt to ensure some arbitrary
1390	 * ordering of calls.
1391	 */
1392	if (edid)
1393		drm_add_display_info(connector, edid);
1394	else
1395		drm_reset_display_info(connector);
1396
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1397	drm_object_property_set_value(&connector->base,
1398				      dev->mode_config.non_desktop_property,
1399				      connector->display_info.non_desktop);
1400
1401	ret = drm_property_replace_global_blob(dev,
1402					       &connector->edid_blob_ptr,
1403	                                       size,
1404	                                       edid,
1405	                                       &connector->base,
1406	                                       dev->mode_config.edid_property);
1407	return ret;
 
 
1408}
1409EXPORT_SYMBOL(drm_mode_connector_update_edid_property);
1410
1411/**
1412 * drm_mode_connector_set_link_status_property - Set link status property of a connector
1413 * @connector: drm connector
1414 * @link_status: new value of link status property (0: Good, 1: Bad)
1415 *
1416 * In usual working scenario, this link status property will always be set to
1417 * "GOOD". If something fails during or after a mode set, the kernel driver
1418 * may set this link status property to "BAD". The caller then needs to send a
1419 * hotplug uevent for userspace to re-check the valid modes through
1420 * GET_CONNECTOR_IOCTL and retry modeset.
1421 *
1422 * Note: Drivers cannot rely on userspace to support this property and
1423 * issue a modeset. As such, they may choose to handle issues (like
1424 * re-training a link) without userspace's intervention.
1425 *
1426 * The reason for adding this property is to handle link training failures, but
1427 * it is not limited to DP or link training. For example, if we implement
1428 * asynchronous setcrtc, this property can be used to report any failures in that.
1429 */
1430void drm_mode_connector_set_link_status_property(struct drm_connector *connector,
1431						 uint64_t link_status)
1432{
1433	struct drm_device *dev = connector->dev;
1434
1435	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1436	connector->state->link_status = link_status;
1437	drm_modeset_unlock(&dev->mode_config.connection_mutex);
1438}
1439EXPORT_SYMBOL(drm_mode_connector_set_link_status_property);
1440
1441/**
1442 * drm_connector_init_panel_orientation_property -
1443 *	initialize the connecters panel_orientation property
1444 * @connector: connector for which to init the panel-orientation property.
1445 * @width: width in pixels of the panel, used for panel quirk detection
1446 * @height: height in pixels of the panel, used for panel quirk detection
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1447 *
1448 * This function should only be called for built-in panels, after setting
1449 * connector->display_info.panel_orientation first (if known).
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1450 *
1451 * This function will check for platform specific (e.g. DMI based) quirks
1452 * overriding display_info.panel_orientation first, then if panel_orientation
1453 * is not DRM_MODE_PANEL_ORIENTATION_UNKNOWN it will attach the
1454 * "panel orientation" property to the connector.
1455 *
1456 * Returns:
1457 * Zero on success, negative errno on failure.
1458 */
1459int drm_connector_init_panel_orientation_property(
1460	struct drm_connector *connector, int width, int height)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1461{
1462	struct drm_device *dev = connector->dev;
1463	struct drm_display_info *info = &connector->display_info;
1464	struct drm_property *prop;
1465	int orientation_quirk;
1466
1467	orientation_quirk = drm_get_panel_orientation_quirk(width, height);
1468	if (orientation_quirk != DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
1469		info->panel_orientation = orientation_quirk;
1470
1471	if (info->panel_orientation == DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
 
1472		return 0;
1473
 
 
1474	prop = dev->mode_config.panel_orientation_property;
1475	if (!prop) {
1476		prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
1477				"panel orientation",
1478				drm_panel_orientation_enum_list,
1479				ARRAY_SIZE(drm_panel_orientation_enum_list));
1480		if (!prop)
1481			return -ENOMEM;
1482
1483		dev->mode_config.panel_orientation_property = prop;
1484	}
1485
1486	drm_object_attach_property(&connector->base, prop,
1487				   info->panel_orientation);
1488	return 0;
1489}
1490EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1491
1492int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj,
1493				    struct drm_property *property,
1494				    uint64_t value)
1495{
1496	int ret = -EINVAL;
1497	struct drm_connector *connector = obj_to_connector(obj);
1498
1499	/* Do DPMS ourselves */
1500	if (property == connector->dev->mode_config.dpms_property) {
1501		ret = (*connector->funcs->dpms)(connector, (int)value);
1502	} else if (connector->funcs->set_property)
1503		ret = connector->funcs->set_property(connector, property, value);
1504
1505	if (!ret)
1506		drm_object_property_set_value(&connector->base, property, value);
1507	return ret;
1508}
1509
1510int drm_mode_connector_property_set_ioctl(struct drm_device *dev,
1511				       void *data, struct drm_file *file_priv)
1512{
1513	struct drm_mode_connector_set_property *conn_set_prop = data;
1514	struct drm_mode_obj_set_property obj_set_prop = {
1515		.value = conn_set_prop->value,
1516		.prop_id = conn_set_prop->prop_id,
1517		.obj_id = conn_set_prop->connector_id,
1518		.obj_type = DRM_MODE_OBJECT_CONNECTOR
1519	};
1520
1521	/* It does all the locking and checking we need */
1522	return drm_mode_obj_set_property_ioctl(dev, &obj_set_prop, file_priv);
1523}
1524
1525static struct drm_encoder *drm_connector_get_encoder(struct drm_connector *connector)
1526{
1527	/* For atomic drivers only state objects are synchronously updated and
1528	 * protected by modeset locks, so check those first. */
 
1529	if (connector->state)
1530		return connector->state->best_encoder;
1531	return connector->encoder;
1532}
1533
1534static bool drm_mode_expose_to_userspace(const struct drm_display_mode *mode,
1535					 const struct drm_file *file_priv)
 
 
1536{
1537	/*
1538	 * If user-space hasn't configured the driver to expose the stereo 3D
1539	 * modes, don't expose them.
1540	 */
1541	if (!file_priv->stereo_allowed && drm_mode_is_stereo(mode))
1542		return false;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1543
1544	return true;
1545}
1546
1547int drm_mode_getconnector(struct drm_device *dev, void *data,
1548			  struct drm_file *file_priv)
1549{
1550	struct drm_mode_get_connector *out_resp = data;
1551	struct drm_connector *connector;
1552	struct drm_encoder *encoder;
1553	struct drm_display_mode *mode;
1554	int mode_count = 0;
1555	int encoders_count = 0;
1556	int ret = 0;
1557	int copied = 0;
1558	int i;
1559	struct drm_mode_modeinfo u_mode;
1560	struct drm_mode_modeinfo __user *mode_ptr;
1561	uint32_t __user *encoder_ptr;
1562
1563	if (!drm_core_check_feature(dev, DRIVER_MODESET))
1564		return -EINVAL;
1565
1566	memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));
1567
1568	connector = drm_connector_lookup(dev, file_priv, out_resp->connector_id);
1569	if (!connector)
1570		return -ENOENT;
1571
1572	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
1573		if (connector->encoder_ids[i] != 0)
1574			encoders_count++;
1575
1576	if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
1577		copied = 0;
1578		encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
1579		for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
1580			if (connector->encoder_ids[i] != 0) {
1581				if (put_user(connector->encoder_ids[i],
1582					     encoder_ptr + copied)) {
1583					ret = -EFAULT;
1584					goto out;
1585				}
1586				copied++;
1587			}
 
1588		}
1589	}
1590	out_resp->count_encoders = encoders_count;
1591
1592	out_resp->connector_id = connector->base.id;
1593	out_resp->connector_type = connector->connector_type;
1594	out_resp->connector_type_id = connector->connector_type_id;
1595
1596	mutex_lock(&dev->mode_config.mutex);
1597	if (out_resp->count_modes == 0) {
1598		connector->funcs->fill_modes(connector,
1599					     dev->mode_config.max_width,
1600					     dev->mode_config.max_height);
 
 
 
 
1601	}
1602
1603	out_resp->mm_width = connector->display_info.width_mm;
1604	out_resp->mm_height = connector->display_info.height_mm;
1605	out_resp->subpixel = connector->display_info.subpixel_order;
1606	out_resp->connection = connector->status;
1607
1608	/* delayed so we get modes regardless of pre-fill_modes state */
1609	list_for_each_entry(mode, &connector->modes, head)
1610		if (drm_mode_expose_to_userspace(mode, file_priv))
 
 
 
 
1611			mode_count++;
 
 
1612
1613	/*
1614	 * This ioctl is called twice, once to determine how much space is
1615	 * needed, and the 2nd time to fill it.
1616	 */
1617	if ((out_resp->count_modes >= mode_count) && mode_count) {
1618		copied = 0;
1619		mode_ptr = (struct drm_mode_modeinfo __user *)(unsigned long)out_resp->modes_ptr;
1620		list_for_each_entry(mode, &connector->modes, head) {
1621			if (!drm_mode_expose_to_userspace(mode, file_priv))
1622				continue;
1623
 
 
 
1624			drm_mode_convert_to_umode(&u_mode, mode);
 
 
 
 
 
 
1625			if (copy_to_user(mode_ptr + copied,
1626					 &u_mode, sizeof(u_mode))) {
1627				ret = -EFAULT;
 
 
 
 
 
 
 
 
1628				mutex_unlock(&dev->mode_config.mutex);
1629
1630				goto out;
1631			}
1632			copied++;
1633		}
 
 
 
 
1634	}
 
1635	out_resp->count_modes = mode_count;
1636	mutex_unlock(&dev->mode_config.mutex);
1637
1638	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1639	encoder = drm_connector_get_encoder(connector);
1640	if (encoder)
1641		out_resp->encoder_id = encoder->base.id;
1642	else
1643		out_resp->encoder_id = 0;
1644
1645	/* Only grab properties after probing, to make sure EDID and other
1646	 * properties reflect the latest status. */
 
1647	ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
1648			(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
1649			(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
1650			&out_resp->count_props);
1651	drm_modeset_unlock(&dev->mode_config.connection_mutex);
1652
1653out:
1654	drm_connector_put(connector);
1655
1656	return ret;
1657}
1658
1659
1660/**
1661 * DOC: Tile group
1662 *
1663 * Tile groups are used to represent tiled monitors with a unique integer
1664 * identifier. Tiled monitors using DisplayID v1.3 have a unique 8-byte handle,
1665 * we store this in a tile group, so we have a common identifier for all tiles
1666 * in a monitor group. The property is called "TILE". Drivers can manage tile
1667 * groups using drm_mode_create_tile_group(), drm_mode_put_tile_group() and
1668 * drm_mode_get_tile_group(). But this is only needed for internal panels where
1669 * the tile group information is exposed through a non-standard way.
1670 */
1671
1672static void drm_tile_group_free(struct kref *kref)
1673{
1674	struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount);
1675	struct drm_device *dev = tg->dev;
 
1676	mutex_lock(&dev->mode_config.idr_mutex);
1677	idr_remove(&dev->mode_config.tile_idr, tg->id);
1678	mutex_unlock(&dev->mode_config.idr_mutex);
1679	kfree(tg);
1680}
1681
1682/**
1683 * drm_mode_put_tile_group - drop a reference to a tile group.
1684 * @dev: DRM device
1685 * @tg: tile group to drop reference to.
1686 *
1687 * drop reference to tile group and free if 0.
1688 */
1689void drm_mode_put_tile_group(struct drm_device *dev,
1690			     struct drm_tile_group *tg)
1691{
1692	kref_put(&tg->refcount, drm_tile_group_free);
1693}
1694EXPORT_SYMBOL(drm_mode_put_tile_group);
1695
1696/**
1697 * drm_mode_get_tile_group - get a reference to an existing tile group
1698 * @dev: DRM device
1699 * @topology: 8-bytes unique per monitor.
1700 *
1701 * Use the unique bytes to get a reference to an existing tile group.
1702 *
1703 * RETURNS:
1704 * tile group or NULL if not found.
1705 */
1706struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
1707					       char topology[8])
1708{
1709	struct drm_tile_group *tg;
1710	int id;
 
1711	mutex_lock(&dev->mode_config.idr_mutex);
1712	idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) {
1713		if (!memcmp(tg->group_data, topology, 8)) {
1714			if (!kref_get_unless_zero(&tg->refcount))
1715				tg = NULL;
1716			mutex_unlock(&dev->mode_config.idr_mutex);
1717			return tg;
1718		}
1719	}
1720	mutex_unlock(&dev->mode_config.idr_mutex);
1721	return NULL;
1722}
1723EXPORT_SYMBOL(drm_mode_get_tile_group);
1724
1725/**
1726 * drm_mode_create_tile_group - create a tile group from a displayid description
1727 * @dev: DRM device
1728 * @topology: 8-bytes unique per monitor.
1729 *
1730 * Create a tile group for the unique monitor, and get a unique
1731 * identifier for the tile group.
1732 *
1733 * RETURNS:
1734 * new tile group or error.
1735 */
1736struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
1737						  char topology[8])
1738{
1739	struct drm_tile_group *tg;
1740	int ret;
1741
1742	tg = kzalloc(sizeof(*tg), GFP_KERNEL);
1743	if (!tg)
1744		return ERR_PTR(-ENOMEM);
1745
1746	kref_init(&tg->refcount);
1747	memcpy(tg->group_data, topology, 8);
1748	tg->dev = dev;
1749
1750	mutex_lock(&dev->mode_config.idr_mutex);
1751	ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL);
1752	if (ret >= 0) {
1753		tg->id = ret;
1754	} else {
1755		kfree(tg);
1756		tg = ERR_PTR(ret);
1757	}
1758
1759	mutex_unlock(&dev->mode_config.idr_mutex);
1760	return tg;
1761}
1762EXPORT_SYMBOL(drm_mode_create_tile_group);