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 62 struct 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 */ 71 static 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 { DRM_MODE_CONNECTOR_WRITEBACK, "Writeback" }, 91 }; 92 93 void drm_connector_ida_init(void) 94 { 95 int i; 96 97 for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++) 98 ida_init(&drm_connector_enum_list[i].ida); 99 } 100 101 void drm_connector_ida_destroy(void) 102 { 103 int i; 104 105 for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++) 106 ida_destroy(&drm_connector_enum_list[i].ida); 107 } 108 109 /** 110 * drm_connector_get_cmdline_mode - reads the user's cmdline mode 111 * @connector: connector to quwery 112 * 113 * The kernel supports per-connector configuration of its consoles through 114 * use of the video= parameter. This function parses that option and 115 * extracts the user's specified mode (or enable/disable status) for a 116 * particular connector. This is typically only used during the early fbdev 117 * setup. 118 */ 119 static void drm_connector_get_cmdline_mode(struct drm_connector *connector) 120 { 121 struct drm_cmdline_mode *mode = &connector->cmdline_mode; 122 char *option = NULL; 123 124 if (fb_get_options(connector->name, &option)) 125 return; 126 127 if (!drm_mode_parse_command_line_for_connector(option, 128 connector, 129 mode)) 130 return; 131 132 if (mode->force) { 133 DRM_INFO("forcing %s connector %s\n", connector->name, 134 drm_get_connector_force_name(mode->force)); 135 connector->force = mode->force; 136 } 137 138 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n", 139 connector->name, 140 mode->xres, mode->yres, 141 mode->refresh_specified ? mode->refresh : 60, 142 mode->rb ? " reduced blanking" : "", 143 mode->margins ? " with margins" : "", 144 mode->interlace ? " interlaced" : ""); 145 } 146 147 static void drm_connector_free(struct kref *kref) 148 { 149 struct drm_connector *connector = 150 container_of(kref, struct drm_connector, base.refcount); 151 struct drm_device *dev = connector->dev; 152 153 drm_mode_object_unregister(dev, &connector->base); 154 connector->funcs->destroy(connector); 155 } 156 157 void drm_connector_free_work_fn(struct work_struct *work) 158 { 159 struct drm_connector *connector, *n; 160 struct drm_device *dev = 161 container_of(work, struct drm_device, mode_config.connector_free_work); 162 struct drm_mode_config *config = &dev->mode_config; 163 unsigned long flags; 164 struct llist_node *freed; 165 166 spin_lock_irqsave(&config->connector_list_lock, flags); 167 freed = llist_del_all(&config->connector_free_list); 168 spin_unlock_irqrestore(&config->connector_list_lock, flags); 169 170 llist_for_each_entry_safe(connector, n, freed, free_node) { 171 drm_mode_object_unregister(dev, &connector->base); 172 connector->funcs->destroy(connector); 173 } 174 } 175 176 /** 177 * drm_connector_init - Init a preallocated connector 178 * @dev: DRM device 179 * @connector: the connector to init 180 * @funcs: callbacks for this connector 181 * @connector_type: user visible type of the connector 182 * 183 * Initialises a preallocated connector. Connectors should be 184 * subclassed as part of driver connector objects. 185 * 186 * Returns: 187 * Zero on success, error code on failure. 188 */ 189 int drm_connector_init(struct drm_device *dev, 190 struct drm_connector *connector, 191 const struct drm_connector_funcs *funcs, 192 int connector_type) 193 { 194 struct drm_mode_config *config = &dev->mode_config; 195 int ret; 196 struct ida *connector_ida = 197 &drm_connector_enum_list[connector_type].ida; 198 199 WARN_ON(drm_drv_uses_atomic_modeset(dev) && 200 (!funcs->atomic_destroy_state || 201 !funcs->atomic_duplicate_state)); 202 203 ret = __drm_mode_object_add(dev, &connector->base, 204 DRM_MODE_OBJECT_CONNECTOR, 205 false, drm_connector_free); 206 if (ret) 207 return ret; 208 209 connector->base.properties = &connector->properties; 210 connector->dev = dev; 211 connector->funcs = funcs; 212 213 /* connector index is used with 32bit bitmasks */ 214 ret = ida_simple_get(&config->connector_ida, 0, 32, GFP_KERNEL); 215 if (ret < 0) { 216 DRM_DEBUG_KMS("Failed to allocate %s connector index: %d\n", 217 drm_connector_enum_list[connector_type].name, 218 ret); 219 goto out_put; 220 } 221 connector->index = ret; 222 ret = 0; 223 224 connector->connector_type = connector_type; 225 connector->connector_type_id = 226 ida_simple_get(connector_ida, 1, 0, GFP_KERNEL); 227 if (connector->connector_type_id < 0) { 228 ret = connector->connector_type_id; 229 goto out_put_id; 230 } 231 connector->name = 232 kasprintf(GFP_KERNEL, "%s-%d", 233 drm_connector_enum_list[connector_type].name, 234 connector->connector_type_id); 235 if (!connector->name) { 236 ret = -ENOMEM; 237 goto out_put_type_id; 238 } 239 240 INIT_LIST_HEAD(&connector->probed_modes); 241 INIT_LIST_HEAD(&connector->modes); 242 mutex_init(&connector->mutex); 243 connector->edid_blob_ptr = NULL; 244 connector->status = connector_status_unknown; 245 connector->display_info.panel_orientation = 246 DRM_MODE_PANEL_ORIENTATION_UNKNOWN; 247 248 drm_connector_get_cmdline_mode(connector); 249 250 /* We should add connectors at the end to avoid upsetting the connector 251 * index too much. */ 252 spin_lock_irq(&config->connector_list_lock); 253 list_add_tail(&connector->head, &config->connector_list); 254 config->num_connector++; 255 spin_unlock_irq(&config->connector_list_lock); 256 257 if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL && 258 connector_type != DRM_MODE_CONNECTOR_WRITEBACK) 259 drm_object_attach_property(&connector->base, 260 config->edid_property, 261 0); 262 263 drm_object_attach_property(&connector->base, 264 config->dpms_property, 0); 265 266 drm_object_attach_property(&connector->base, 267 config->link_status_property, 268 0); 269 270 drm_object_attach_property(&connector->base, 271 config->non_desktop_property, 272 0); 273 274 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) { 275 drm_object_attach_property(&connector->base, config->prop_crtc_id, 0); 276 } 277 278 connector->debugfs_entry = NULL; 279 out_put_type_id: 280 if (ret) 281 ida_simple_remove(connector_ida, connector->connector_type_id); 282 out_put_id: 283 if (ret) 284 ida_simple_remove(&config->connector_ida, connector->index); 285 out_put: 286 if (ret) 287 drm_mode_object_unregister(dev, &connector->base); 288 289 return ret; 290 } 291 EXPORT_SYMBOL(drm_connector_init); 292 293 /** 294 * drm_mode_connector_attach_encoder - attach a connector to an encoder 295 * @connector: connector to attach 296 * @encoder: encoder to attach @connector to 297 * 298 * This function links up a connector to an encoder. Note that the routing 299 * restrictions between encoders and crtcs are exposed to userspace through the 300 * possible_clones and possible_crtcs bitmasks. 301 * 302 * Returns: 303 * Zero on success, negative errno on failure. 304 */ 305 int drm_mode_connector_attach_encoder(struct drm_connector *connector, 306 struct drm_encoder *encoder) 307 { 308 int i; 309 310 /* 311 * In the past, drivers have attempted to model the static association 312 * of connector to encoder in simple connector/encoder devices using a 313 * direct assignment of connector->encoder = encoder. This connection 314 * is a logical one and the responsibility of the core, so drivers are 315 * expected not to mess with this. 316 * 317 * Note that the error return should've been enough here, but a large 318 * majority of drivers ignores the return value, so add in a big WARN 319 * to get people's attention. 320 */ 321 if (WARN_ON(connector->encoder)) 322 return -EINVAL; 323 324 for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) { 325 if (connector->encoder_ids[i] == 0) { 326 connector->encoder_ids[i] = encoder->base.id; 327 return 0; 328 } 329 } 330 return -ENOMEM; 331 } 332 EXPORT_SYMBOL(drm_mode_connector_attach_encoder); 333 334 static void drm_mode_remove(struct drm_connector *connector, 335 struct drm_display_mode *mode) 336 { 337 list_del(&mode->head); 338 drm_mode_destroy(connector->dev, mode); 339 } 340 341 /** 342 * drm_connector_cleanup - cleans up an initialised connector 343 * @connector: connector to cleanup 344 * 345 * Cleans up the connector but doesn't free the object. 346 */ 347 void drm_connector_cleanup(struct drm_connector *connector) 348 { 349 struct drm_device *dev = connector->dev; 350 struct drm_display_mode *mode, *t; 351 352 /* The connector should have been removed from userspace long before 353 * it is finally destroyed. 354 */ 355 if (WARN_ON(connector->registered)) 356 drm_connector_unregister(connector); 357 358 if (connector->tile_group) { 359 drm_mode_put_tile_group(dev, connector->tile_group); 360 connector->tile_group = NULL; 361 } 362 363 list_for_each_entry_safe(mode, t, &connector->probed_modes, head) 364 drm_mode_remove(connector, mode); 365 366 list_for_each_entry_safe(mode, t, &connector->modes, head) 367 drm_mode_remove(connector, mode); 368 369 ida_simple_remove(&drm_connector_enum_list[connector->connector_type].ida, 370 connector->connector_type_id); 371 372 ida_simple_remove(&dev->mode_config.connector_ida, 373 connector->index); 374 375 kfree(connector->display_info.bus_formats); 376 drm_mode_object_unregister(dev, &connector->base); 377 kfree(connector->name); 378 connector->name = NULL; 379 spin_lock_irq(&dev->mode_config.connector_list_lock); 380 list_del(&connector->head); 381 dev->mode_config.num_connector--; 382 spin_unlock_irq(&dev->mode_config.connector_list_lock); 383 384 WARN_ON(connector->state && !connector->funcs->atomic_destroy_state); 385 if (connector->state && connector->funcs->atomic_destroy_state) 386 connector->funcs->atomic_destroy_state(connector, 387 connector->state); 388 389 mutex_destroy(&connector->mutex); 390 391 memset(connector, 0, sizeof(*connector)); 392 } 393 EXPORT_SYMBOL(drm_connector_cleanup); 394 395 /** 396 * drm_connector_register - register a connector 397 * @connector: the connector to register 398 * 399 * Register userspace interfaces for a connector 400 * 401 * Returns: 402 * Zero on success, error code on failure. 403 */ 404 int drm_connector_register(struct drm_connector *connector) 405 { 406 int ret = 0; 407 408 if (!connector->dev->registered) 409 return 0; 410 411 mutex_lock(&connector->mutex); 412 if (connector->registered) 413 goto unlock; 414 415 ret = drm_sysfs_connector_add(connector); 416 if (ret) 417 goto unlock; 418 419 ret = drm_debugfs_connector_add(connector); 420 if (ret) { 421 goto err_sysfs; 422 } 423 424 if (connector->funcs->late_register) { 425 ret = connector->funcs->late_register(connector); 426 if (ret) 427 goto err_debugfs; 428 } 429 430 drm_mode_object_register(connector->dev, &connector->base); 431 432 connector->registered = true; 433 goto unlock; 434 435 err_debugfs: 436 drm_debugfs_connector_remove(connector); 437 err_sysfs: 438 drm_sysfs_connector_remove(connector); 439 unlock: 440 mutex_unlock(&connector->mutex); 441 return ret; 442 } 443 EXPORT_SYMBOL(drm_connector_register); 444 445 /** 446 * drm_connector_unregister - unregister a connector 447 * @connector: the connector to unregister 448 * 449 * Unregister userspace interfaces for a connector 450 */ 451 void drm_connector_unregister(struct drm_connector *connector) 452 { 453 mutex_lock(&connector->mutex); 454 if (!connector->registered) { 455 mutex_unlock(&connector->mutex); 456 return; 457 } 458 459 if (connector->funcs->early_unregister) 460 connector->funcs->early_unregister(connector); 461 462 drm_sysfs_connector_remove(connector); 463 drm_debugfs_connector_remove(connector); 464 465 connector->registered = false; 466 mutex_unlock(&connector->mutex); 467 } 468 EXPORT_SYMBOL(drm_connector_unregister); 469 470 void drm_connector_unregister_all(struct drm_device *dev) 471 { 472 struct drm_connector *connector; 473 struct drm_connector_list_iter conn_iter; 474 475 drm_connector_list_iter_begin(dev, &conn_iter); 476 drm_for_each_connector_iter(connector, &conn_iter) 477 drm_connector_unregister(connector); 478 drm_connector_list_iter_end(&conn_iter); 479 } 480 481 int drm_connector_register_all(struct drm_device *dev) 482 { 483 struct drm_connector *connector; 484 struct drm_connector_list_iter conn_iter; 485 int ret = 0; 486 487 drm_connector_list_iter_begin(dev, &conn_iter); 488 drm_for_each_connector_iter(connector, &conn_iter) { 489 ret = drm_connector_register(connector); 490 if (ret) 491 break; 492 } 493 drm_connector_list_iter_end(&conn_iter); 494 495 if (ret) 496 drm_connector_unregister_all(dev); 497 return ret; 498 } 499 500 /** 501 * drm_get_connector_status_name - return a string for connector status 502 * @status: connector status to compute name of 503 * 504 * In contrast to the other drm_get_*_name functions this one here returns a 505 * const pointer and hence is threadsafe. 506 */ 507 const char *drm_get_connector_status_name(enum drm_connector_status status) 508 { 509 if (status == connector_status_connected) 510 return "connected"; 511 else if (status == connector_status_disconnected) 512 return "disconnected"; 513 else 514 return "unknown"; 515 } 516 EXPORT_SYMBOL(drm_get_connector_status_name); 517 518 /** 519 * drm_get_connector_force_name - return a string for connector force 520 * @force: connector force to get name of 521 * 522 * Returns: const pointer to name. 523 */ 524 const char *drm_get_connector_force_name(enum drm_connector_force force) 525 { 526 switch (force) { 527 case DRM_FORCE_UNSPECIFIED: 528 return "unspecified"; 529 case DRM_FORCE_OFF: 530 return "off"; 531 case DRM_FORCE_ON: 532 return "on"; 533 case DRM_FORCE_ON_DIGITAL: 534 return "digital"; 535 default: 536 return "unknown"; 537 } 538 } 539 540 #ifdef CONFIG_LOCKDEP 541 static struct lockdep_map connector_list_iter_dep_map = { 542 .name = "drm_connector_list_iter" 543 }; 544 #endif 545 546 /** 547 * drm_connector_list_iter_begin - initialize a connector_list iterator 548 * @dev: DRM device 549 * @iter: connector_list iterator 550 * 551 * Sets @iter up to walk the &drm_mode_config.connector_list of @dev. @iter 552 * must always be cleaned up again by calling drm_connector_list_iter_end(). 553 * Iteration itself happens using drm_connector_list_iter_next() or 554 * drm_for_each_connector_iter(). 555 */ 556 void drm_connector_list_iter_begin(struct drm_device *dev, 557 struct drm_connector_list_iter *iter) 558 { 559 iter->dev = dev; 560 iter->conn = NULL; 561 lock_acquire_shared_recursive(&connector_list_iter_dep_map, 0, 1, NULL, _RET_IP_); 562 } 563 EXPORT_SYMBOL(drm_connector_list_iter_begin); 564 565 /* 566 * Extra-safe connector put function that works in any context. Should only be 567 * used from the connector_iter functions, where we never really expect to 568 * actually release the connector when dropping our final reference. 569 */ 570 static void 571 __drm_connector_put_safe(struct drm_connector *conn) 572 { 573 struct drm_mode_config *config = &conn->dev->mode_config; 574 575 lockdep_assert_held(&config->connector_list_lock); 576 577 if (!refcount_dec_and_test(&conn->base.refcount.refcount)) 578 return; 579 580 llist_add(&conn->free_node, &config->connector_free_list); 581 schedule_work(&config->connector_free_work); 582 } 583 584 /** 585 * drm_connector_list_iter_next - return next connector 586 * @iter: connectr_list iterator 587 * 588 * Returns the next connector for @iter, or NULL when the list walk has 589 * completed. 590 */ 591 struct drm_connector * 592 drm_connector_list_iter_next(struct drm_connector_list_iter *iter) 593 { 594 struct drm_connector *old_conn = iter->conn; 595 struct drm_mode_config *config = &iter->dev->mode_config; 596 struct list_head *lhead; 597 unsigned long flags; 598 599 spin_lock_irqsave(&config->connector_list_lock, flags); 600 lhead = old_conn ? &old_conn->head : &config->connector_list; 601 602 do { 603 if (lhead->next == &config->connector_list) { 604 iter->conn = NULL; 605 break; 606 } 607 608 lhead = lhead->next; 609 iter->conn = list_entry(lhead, struct drm_connector, head); 610 611 /* loop until it's not a zombie connector */ 612 } while (!kref_get_unless_zero(&iter->conn->base.refcount)); 613 614 if (old_conn) 615 __drm_connector_put_safe(old_conn); 616 spin_unlock_irqrestore(&config->connector_list_lock, flags); 617 618 return iter->conn; 619 } 620 EXPORT_SYMBOL(drm_connector_list_iter_next); 621 622 /** 623 * drm_connector_list_iter_end - tear down a connector_list iterator 624 * @iter: connector_list iterator 625 * 626 * Tears down @iter and releases any resources (like &drm_connector references) 627 * acquired while walking the list. This must always be called, both when the 628 * iteration completes fully or when it was aborted without walking the entire 629 * list. 630 */ 631 void drm_connector_list_iter_end(struct drm_connector_list_iter *iter) 632 { 633 struct drm_mode_config *config = &iter->dev->mode_config; 634 unsigned long flags; 635 636 iter->dev = NULL; 637 if (iter->conn) { 638 spin_lock_irqsave(&config->connector_list_lock, flags); 639 __drm_connector_put_safe(iter->conn); 640 spin_unlock_irqrestore(&config->connector_list_lock, flags); 641 } 642 lock_release(&connector_list_iter_dep_map, 0, _RET_IP_); 643 } 644 EXPORT_SYMBOL(drm_connector_list_iter_end); 645 646 static const struct drm_prop_enum_list drm_subpixel_enum_list[] = { 647 { SubPixelUnknown, "Unknown" }, 648 { SubPixelHorizontalRGB, "Horizontal RGB" }, 649 { SubPixelHorizontalBGR, "Horizontal BGR" }, 650 { SubPixelVerticalRGB, "Vertical RGB" }, 651 { SubPixelVerticalBGR, "Vertical BGR" }, 652 { SubPixelNone, "None" }, 653 }; 654 655 /** 656 * drm_get_subpixel_order_name - return a string for a given subpixel enum 657 * @order: enum of subpixel_order 658 * 659 * Note you could abuse this and return something out of bounds, but that 660 * would be a caller error. No unscrubbed user data should make it here. 661 */ 662 const char *drm_get_subpixel_order_name(enum subpixel_order order) 663 { 664 return drm_subpixel_enum_list[order].name; 665 } 666 EXPORT_SYMBOL(drm_get_subpixel_order_name); 667 668 static const struct drm_prop_enum_list drm_dpms_enum_list[] = { 669 { DRM_MODE_DPMS_ON, "On" }, 670 { DRM_MODE_DPMS_STANDBY, "Standby" }, 671 { DRM_MODE_DPMS_SUSPEND, "Suspend" }, 672 { DRM_MODE_DPMS_OFF, "Off" } 673 }; 674 DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list) 675 676 static const struct drm_prop_enum_list drm_link_status_enum_list[] = { 677 { DRM_MODE_LINK_STATUS_GOOD, "Good" }, 678 { DRM_MODE_LINK_STATUS_BAD, "Bad" }, 679 }; 680 681 /** 682 * drm_display_info_set_bus_formats - set the supported bus formats 683 * @info: display info to store bus formats in 684 * @formats: array containing the supported bus formats 685 * @num_formats: the number of entries in the fmts array 686 * 687 * Store the supported bus formats in display info structure. 688 * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for 689 * a full list of available formats. 690 */ 691 int drm_display_info_set_bus_formats(struct drm_display_info *info, 692 const u32 *formats, 693 unsigned int num_formats) 694 { 695 u32 *fmts = NULL; 696 697 if (!formats && num_formats) 698 return -EINVAL; 699 700 if (formats && num_formats) { 701 fmts = kmemdup(formats, sizeof(*formats) * num_formats, 702 GFP_KERNEL); 703 if (!fmts) 704 return -ENOMEM; 705 } 706 707 kfree(info->bus_formats); 708 info->bus_formats = fmts; 709 info->num_bus_formats = num_formats; 710 711 return 0; 712 } 713 EXPORT_SYMBOL(drm_display_info_set_bus_formats); 714 715 /* Optional connector properties. */ 716 static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = { 717 { DRM_MODE_SCALE_NONE, "None" }, 718 { DRM_MODE_SCALE_FULLSCREEN, "Full" }, 719 { DRM_MODE_SCALE_CENTER, "Center" }, 720 { DRM_MODE_SCALE_ASPECT, "Full aspect" }, 721 }; 722 723 static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = { 724 { DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" }, 725 { DRM_MODE_PICTURE_ASPECT_4_3, "4:3" }, 726 { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" }, 727 }; 728 729 static const struct drm_prop_enum_list drm_content_type_enum_list[] = { 730 { DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" }, 731 { DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" }, 732 { DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" }, 733 { DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" }, 734 { DRM_MODE_CONTENT_TYPE_GAME, "Game" }, 735 }; 736 737 static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = { 738 { DRM_MODE_PANEL_ORIENTATION_NORMAL, "Normal" }, 739 { DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP, "Upside Down" }, 740 { DRM_MODE_PANEL_ORIENTATION_LEFT_UP, "Left Side Up" }, 741 { DRM_MODE_PANEL_ORIENTATION_RIGHT_UP, "Right Side Up" }, 742 }; 743 744 static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = { 745 { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */ 746 { DRM_MODE_SUBCONNECTOR_DVID, "DVI-D" }, /* DVI-I */ 747 { DRM_MODE_SUBCONNECTOR_DVIA, "DVI-A" }, /* DVI-I */ 748 }; 749 DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list) 750 751 static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = { 752 { DRM_MODE_SUBCONNECTOR_Unknown, "Unknown" }, /* DVI-I and TV-out */ 753 { DRM_MODE_SUBCONNECTOR_DVID, "DVI-D" }, /* DVI-I */ 754 { DRM_MODE_SUBCONNECTOR_DVIA, "DVI-A" }, /* DVI-I */ 755 }; 756 DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name, 757 drm_dvi_i_subconnector_enum_list) 758 759 static const struct drm_prop_enum_list drm_tv_select_enum_list[] = { 760 { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */ 761 { DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */ 762 { DRM_MODE_SUBCONNECTOR_SVIDEO, "SVIDEO" }, /* TV-out */ 763 { DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */ 764 { DRM_MODE_SUBCONNECTOR_SCART, "SCART" }, /* TV-out */ 765 }; 766 DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list) 767 768 static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = { 769 { DRM_MODE_SUBCONNECTOR_Unknown, "Unknown" }, /* DVI-I and TV-out */ 770 { DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */ 771 { DRM_MODE_SUBCONNECTOR_SVIDEO, "SVIDEO" }, /* TV-out */ 772 { DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */ 773 { DRM_MODE_SUBCONNECTOR_SCART, "SCART" }, /* TV-out */ 774 }; 775 DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name, 776 drm_tv_subconnector_enum_list) 777 778 static struct drm_prop_enum_list drm_cp_enum_list[] = { 779 { DRM_MODE_CONTENT_PROTECTION_UNDESIRED, "Undesired" }, 780 { DRM_MODE_CONTENT_PROTECTION_DESIRED, "Desired" }, 781 { DRM_MODE_CONTENT_PROTECTION_ENABLED, "Enabled" }, 782 }; 783 DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list) 784 785 /** 786 * DOC: standard connector properties 787 * 788 * DRM connectors have a few standardized properties: 789 * 790 * EDID: 791 * Blob property which contains the current EDID read from the sink. This 792 * is useful to parse sink identification information like vendor, model 793 * and serial. Drivers should update this property by calling 794 * drm_mode_connector_update_edid_property(), usually after having parsed 795 * the EDID using drm_add_edid_modes(). Userspace cannot change this 796 * property. 797 * DPMS: 798 * Legacy property for setting the power state of the connector. For atomic 799 * drivers this is only provided for backwards compatibility with existing 800 * drivers, it remaps to controlling the "ACTIVE" property on the CRTC the 801 * connector is linked to. Drivers should never set this property directly, 802 * it is handled by the DRM core by calling the &drm_connector_funcs.dpms 803 * callback. For atomic drivers the remapping to the "ACTIVE" property is 804 * implemented in the DRM core. This is the only standard connector 805 * property that userspace can change. 806 * 807 * Note that this property cannot be set through the MODE_ATOMIC ioctl, 808 * userspace must use "ACTIVE" on the CRTC instead. 809 * 810 * WARNING: 811 * 812 * For userspace also running on legacy drivers the "DPMS" semantics are a 813 * lot more complicated. First, userspace cannot rely on the "DPMS" value 814 * returned by the GETCONNECTOR actually reflecting reality, because many 815 * drivers fail to update it. For atomic drivers this is taken care of in 816 * drm_atomic_helper_update_legacy_modeset_state(). 817 * 818 * The second issue is that the DPMS state is only well-defined when the 819 * connector is connected to a CRTC. In atomic the DRM core enforces that 820 * "ACTIVE" is off in such a case, no such checks exists for "DPMS". 821 * 822 * Finally, when enabling an output using the legacy SETCONFIG ioctl then 823 * "DPMS" is forced to ON. But see above, that might not be reflected in 824 * the software value on legacy drivers. 825 * 826 * Summarizing: Only set "DPMS" when the connector is known to be enabled, 827 * assume that a successful SETCONFIG call also sets "DPMS" to on, and 828 * never read back the value of "DPMS" because it can be incorrect. 829 * PATH: 830 * Connector path property to identify how this sink is physically 831 * connected. Used by DP MST. This should be set by calling 832 * drm_mode_connector_set_path_property(), in the case of DP MST with the 833 * path property the MST manager created. Userspace cannot change this 834 * property. 835 * TILE: 836 * Connector tile group property to indicate how a set of DRM connector 837 * compose together into one logical screen. This is used by both high-res 838 * external screens (often only using a single cable, but exposing multiple 839 * DP MST sinks), or high-res integrated panels (like dual-link DSI) which 840 * are not gen-locked. Note that for tiled panels which are genlocked, like 841 * dual-link LVDS or dual-link DSI, the driver should try to not expose the 842 * tiling and virtualize both &drm_crtc and &drm_plane if needed. Drivers 843 * should update this value using drm_mode_connector_set_tile_property(). 844 * Userspace cannot change this property. 845 * link-status: 846 * Connector link-status property to indicate the status of link. The 847 * default value of link-status is "GOOD". If something fails during or 848 * after modeset, the kernel driver may set this to "BAD" and issue a 849 * hotplug uevent. Drivers should update this value using 850 * drm_mode_connector_set_link_status_property(). 851 * non_desktop: 852 * Indicates the output should be ignored for purposes of displaying a 853 * standard desktop environment or console. This is most likely because 854 * the output device is not rectilinear. 855 * Content Protection: 856 * This property is used by userspace to request the kernel protect future 857 * content communicated over the link. When requested, kernel will apply 858 * the appropriate means of protection (most often HDCP), and use the 859 * property to tell userspace the protection is active. 860 * 861 * Drivers can set this up by calling 862 * drm_connector_attach_content_protection_property() on initialization. 863 * 864 * The value of this property can be one of the following: 865 * 866 * DRM_MODE_CONTENT_PROTECTION_UNDESIRED = 0 867 * The link is not protected, content is transmitted in the clear. 868 * DRM_MODE_CONTENT_PROTECTION_DESIRED = 1 869 * Userspace has requested content protection, but the link is not 870 * currently protected. When in this state, kernel should enable 871 * Content Protection as soon as possible. 872 * DRM_MODE_CONTENT_PROTECTION_ENABLED = 2 873 * Userspace has requested content protection, and the link is 874 * protected. Only the driver can set the property to this value. 875 * If userspace attempts to set to ENABLED, kernel will return 876 * -EINVAL. 877 * 878 * A few guidelines: 879 * 880 * - DESIRED state should be preserved until userspace de-asserts it by 881 * setting the property to UNDESIRED. This means ENABLED should only 882 * transition to UNDESIRED when the user explicitly requests it. 883 * - If the state is DESIRED, kernel should attempt to re-authenticate the 884 * link whenever possible. This includes across disable/enable, dpms, 885 * hotplug, downstream device changes, link status failures, etc.. 886 * - Userspace is responsible for polling the property to determine when 887 * the value transitions from ENABLED to DESIRED. This signifies the link 888 * is no longer protected and userspace should take appropriate action 889 * (whatever that might be). 890 * 891 * Connectors also have one standardized atomic property: 892 * 893 * CRTC_ID: 894 * Mode object ID of the &drm_crtc this connector should be connected to. 895 * 896 * Connectors for LCD panels may also have one standardized property: 897 * 898 * panel orientation: 899 * On some devices the LCD panel is mounted in the casing in such a way 900 * that the up/top side of the panel does not match with the top side of 901 * the device. Userspace can use this property to check for this. 902 * Note that input coordinates from touchscreens (input devices with 903 * INPUT_PROP_DIRECT) will still map 1:1 to the actual LCD panel 904 * coordinates, so if userspace rotates the picture to adjust for 905 * the orientation it must also apply the same transformation to the 906 * touchscreen input coordinates. This property is initialized by calling 907 * drm_connector_init_panel_orientation_property(). 908 * 909 * scaling mode: 910 * This property defines how a non-native mode is upscaled to the native 911 * mode of an LCD panel: 912 * 913 * None: 914 * No upscaling happens, scaling is left to the panel. Not all 915 * drivers expose this mode. 916 * Full: 917 * The output is upscaled to the full resolution of the panel, 918 * ignoring the aspect ratio. 919 * Center: 920 * No upscaling happens, the output is centered within the native 921 * resolution the panel. 922 * Full aspect: 923 * The output is upscaled to maximize either the width or height 924 * while retaining the aspect ratio. 925 * 926 * This property should be set up by calling 927 * drm_connector_attach_scaling_mode_property(). Note that drivers 928 * can also expose this property to external outputs, in which case they 929 * must support "None", which should be the default (since external screens 930 * have a built-in scaler). 931 */ 932 933 int drm_connector_create_standard_properties(struct drm_device *dev) 934 { 935 struct drm_property *prop; 936 937 prop = drm_property_create(dev, DRM_MODE_PROP_BLOB | 938 DRM_MODE_PROP_IMMUTABLE, 939 "EDID", 0); 940 if (!prop) 941 return -ENOMEM; 942 dev->mode_config.edid_property = prop; 943 944 prop = drm_property_create_enum(dev, 0, 945 "DPMS", drm_dpms_enum_list, 946 ARRAY_SIZE(drm_dpms_enum_list)); 947 if (!prop) 948 return -ENOMEM; 949 dev->mode_config.dpms_property = prop; 950 951 prop = drm_property_create(dev, 952 DRM_MODE_PROP_BLOB | 953 DRM_MODE_PROP_IMMUTABLE, 954 "PATH", 0); 955 if (!prop) 956 return -ENOMEM; 957 dev->mode_config.path_property = prop; 958 959 prop = drm_property_create(dev, 960 DRM_MODE_PROP_BLOB | 961 DRM_MODE_PROP_IMMUTABLE, 962 "TILE", 0); 963 if (!prop) 964 return -ENOMEM; 965 dev->mode_config.tile_property = prop; 966 967 prop = drm_property_create_enum(dev, 0, "link-status", 968 drm_link_status_enum_list, 969 ARRAY_SIZE(drm_link_status_enum_list)); 970 if (!prop) 971 return -ENOMEM; 972 dev->mode_config.link_status_property = prop; 973 974 prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE, "non-desktop"); 975 if (!prop) 976 return -ENOMEM; 977 dev->mode_config.non_desktop_property = prop; 978 979 return 0; 980 } 981 982 /** 983 * drm_mode_create_dvi_i_properties - create DVI-I specific connector properties 984 * @dev: DRM device 985 * 986 * Called by a driver the first time a DVI-I connector is made. 987 */ 988 int drm_mode_create_dvi_i_properties(struct drm_device *dev) 989 { 990 struct drm_property *dvi_i_selector; 991 struct drm_property *dvi_i_subconnector; 992 993 if (dev->mode_config.dvi_i_select_subconnector_property) 994 return 0; 995 996 dvi_i_selector = 997 drm_property_create_enum(dev, 0, 998 "select subconnector", 999 drm_dvi_i_select_enum_list, 1000 ARRAY_SIZE(drm_dvi_i_select_enum_list)); 1001 dev->mode_config.dvi_i_select_subconnector_property = dvi_i_selector; 1002 1003 dvi_i_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE, 1004 "subconnector", 1005 drm_dvi_i_subconnector_enum_list, 1006 ARRAY_SIZE(drm_dvi_i_subconnector_enum_list)); 1007 dev->mode_config.dvi_i_subconnector_property = dvi_i_subconnector; 1008 1009 return 0; 1010 } 1011 EXPORT_SYMBOL(drm_mode_create_dvi_i_properties); 1012 1013 /** 1014 * DOC: HDMI connector properties 1015 * 1016 * content type (HDMI specific): 1017 * Indicates content type setting to be used in HDMI infoframes to indicate 1018 * content type for the external device, so that it adjusts it's display 1019 * settings accordingly. 1020 * 1021 * The value of this property can be one of the following: 1022 * 1023 * No Data: 1024 * Content type is unknown 1025 * Graphics: 1026 * Content type is graphics 1027 * Photo: 1028 * Content type is photo 1029 * Cinema: 1030 * Content type is cinema 1031 * Game: 1032 * Content type is game 1033 * 1034 * Drivers can set up this property by calling 1035 * drm_connector_attach_content_type_property(). Decoding to 1036 * infoframe values is done through drm_hdmi_avi_infoframe_content_type(). 1037 */ 1038 1039 /** 1040 * drm_connector_attach_content_type_property - attach content-type property 1041 * @connector: connector to attach content type property on. 1042 * 1043 * Called by a driver the first time a HDMI connector is made. 1044 */ 1045 int drm_connector_attach_content_type_property(struct drm_connector *connector) 1046 { 1047 if (!drm_mode_create_content_type_property(connector->dev)) 1048 drm_object_attach_property(&connector->base, 1049 connector->dev->mode_config.content_type_property, 1050 DRM_MODE_CONTENT_TYPE_NO_DATA); 1051 return 0; 1052 } 1053 EXPORT_SYMBOL(drm_connector_attach_content_type_property); 1054 1055 1056 /** 1057 * drm_hdmi_avi_infoframe_content_type() - fill the HDMI AVI infoframe 1058 * content type information, based 1059 * on correspondent DRM property. 1060 * @frame: HDMI AVI infoframe 1061 * @conn_state: DRM display connector state 1062 * 1063 */ 1064 void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame, 1065 const struct drm_connector_state *conn_state) 1066 { 1067 switch (conn_state->content_type) { 1068 case DRM_MODE_CONTENT_TYPE_GRAPHICS: 1069 frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS; 1070 break; 1071 case DRM_MODE_CONTENT_TYPE_CINEMA: 1072 frame->content_type = HDMI_CONTENT_TYPE_CINEMA; 1073 break; 1074 case DRM_MODE_CONTENT_TYPE_GAME: 1075 frame->content_type = HDMI_CONTENT_TYPE_GAME; 1076 break; 1077 case DRM_MODE_CONTENT_TYPE_PHOTO: 1078 frame->content_type = HDMI_CONTENT_TYPE_PHOTO; 1079 break; 1080 default: 1081 /* Graphics is the default(0) */ 1082 frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS; 1083 } 1084 1085 frame->itc = conn_state->content_type != DRM_MODE_CONTENT_TYPE_NO_DATA; 1086 } 1087 EXPORT_SYMBOL(drm_hdmi_avi_infoframe_content_type); 1088 1089 /** 1090 * drm_create_tv_properties - create TV specific connector properties 1091 * @dev: DRM device 1092 * @num_modes: number of different TV formats (modes) supported 1093 * @modes: array of pointers to strings containing name of each format 1094 * 1095 * Called by a driver's TV initialization routine, this function creates 1096 * the TV specific connector properties for a given device. Caller is 1097 * responsible for allocating a list of format names and passing them to 1098 * this routine. 1099 */ 1100 int drm_mode_create_tv_properties(struct drm_device *dev, 1101 unsigned int num_modes, 1102 const char * const modes[]) 1103 { 1104 struct drm_property *tv_selector; 1105 struct drm_property *tv_subconnector; 1106 unsigned int i; 1107 1108 if (dev->mode_config.tv_select_subconnector_property) 1109 return 0; 1110 1111 /* 1112 * Basic connector properties 1113 */ 1114 tv_selector = drm_property_create_enum(dev, 0, 1115 "select subconnector", 1116 drm_tv_select_enum_list, 1117 ARRAY_SIZE(drm_tv_select_enum_list)); 1118 if (!tv_selector) 1119 goto nomem; 1120 1121 dev->mode_config.tv_select_subconnector_property = tv_selector; 1122 1123 tv_subconnector = 1124 drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE, 1125 "subconnector", 1126 drm_tv_subconnector_enum_list, 1127 ARRAY_SIZE(drm_tv_subconnector_enum_list)); 1128 if (!tv_subconnector) 1129 goto nomem; 1130 dev->mode_config.tv_subconnector_property = tv_subconnector; 1131 1132 /* 1133 * Other, TV specific properties: margins & TV modes. 1134 */ 1135 dev->mode_config.tv_left_margin_property = 1136 drm_property_create_range(dev, 0, "left margin", 0, 100); 1137 if (!dev->mode_config.tv_left_margin_property) 1138 goto nomem; 1139 1140 dev->mode_config.tv_right_margin_property = 1141 drm_property_create_range(dev, 0, "right margin", 0, 100); 1142 if (!dev->mode_config.tv_right_margin_property) 1143 goto nomem; 1144 1145 dev->mode_config.tv_top_margin_property = 1146 drm_property_create_range(dev, 0, "top margin", 0, 100); 1147 if (!dev->mode_config.tv_top_margin_property) 1148 goto nomem; 1149 1150 dev->mode_config.tv_bottom_margin_property = 1151 drm_property_create_range(dev, 0, "bottom margin", 0, 100); 1152 if (!dev->mode_config.tv_bottom_margin_property) 1153 goto nomem; 1154 1155 dev->mode_config.tv_mode_property = 1156 drm_property_create(dev, DRM_MODE_PROP_ENUM, 1157 "mode", num_modes); 1158 if (!dev->mode_config.tv_mode_property) 1159 goto nomem; 1160 1161 for (i = 0; i < num_modes; i++) 1162 drm_property_add_enum(dev->mode_config.tv_mode_property, 1163 i, modes[i]); 1164 1165 dev->mode_config.tv_brightness_property = 1166 drm_property_create_range(dev, 0, "brightness", 0, 100); 1167 if (!dev->mode_config.tv_brightness_property) 1168 goto nomem; 1169 1170 dev->mode_config.tv_contrast_property = 1171 drm_property_create_range(dev, 0, "contrast", 0, 100); 1172 if (!dev->mode_config.tv_contrast_property) 1173 goto nomem; 1174 1175 dev->mode_config.tv_flicker_reduction_property = 1176 drm_property_create_range(dev, 0, "flicker reduction", 0, 100); 1177 if (!dev->mode_config.tv_flicker_reduction_property) 1178 goto nomem; 1179 1180 dev->mode_config.tv_overscan_property = 1181 drm_property_create_range(dev, 0, "overscan", 0, 100); 1182 if (!dev->mode_config.tv_overscan_property) 1183 goto nomem; 1184 1185 dev->mode_config.tv_saturation_property = 1186 drm_property_create_range(dev, 0, "saturation", 0, 100); 1187 if (!dev->mode_config.tv_saturation_property) 1188 goto nomem; 1189 1190 dev->mode_config.tv_hue_property = 1191 drm_property_create_range(dev, 0, "hue", 0, 100); 1192 if (!dev->mode_config.tv_hue_property) 1193 goto nomem; 1194 1195 return 0; 1196 nomem: 1197 return -ENOMEM; 1198 } 1199 EXPORT_SYMBOL(drm_mode_create_tv_properties); 1200 1201 /** 1202 * drm_mode_create_scaling_mode_property - create scaling mode property 1203 * @dev: DRM device 1204 * 1205 * Called by a driver the first time it's needed, must be attached to desired 1206 * connectors. 1207 * 1208 * Atomic drivers should use drm_connector_attach_scaling_mode_property() 1209 * instead to correctly assign &drm_connector_state.picture_aspect_ratio 1210 * in the atomic state. 1211 */ 1212 int drm_mode_create_scaling_mode_property(struct drm_device *dev) 1213 { 1214 struct drm_property *scaling_mode; 1215 1216 if (dev->mode_config.scaling_mode_property) 1217 return 0; 1218 1219 scaling_mode = 1220 drm_property_create_enum(dev, 0, "scaling mode", 1221 drm_scaling_mode_enum_list, 1222 ARRAY_SIZE(drm_scaling_mode_enum_list)); 1223 1224 dev->mode_config.scaling_mode_property = scaling_mode; 1225 1226 return 0; 1227 } 1228 EXPORT_SYMBOL(drm_mode_create_scaling_mode_property); 1229 1230 /** 1231 * drm_connector_attach_scaling_mode_property - attach atomic scaling mode property 1232 * @connector: connector to attach scaling mode property on. 1233 * @scaling_mode_mask: or'ed mask of BIT(%DRM_MODE_SCALE_\*). 1234 * 1235 * This is used to add support for scaling mode to atomic drivers. 1236 * The scaling mode will be set to &drm_connector_state.picture_aspect_ratio 1237 * and can be used from &drm_connector_helper_funcs->atomic_check for validation. 1238 * 1239 * This is the atomic version of drm_mode_create_scaling_mode_property(). 1240 * 1241 * Returns: 1242 * Zero on success, negative errno on failure. 1243 */ 1244 int drm_connector_attach_scaling_mode_property(struct drm_connector *connector, 1245 u32 scaling_mode_mask) 1246 { 1247 struct drm_device *dev = connector->dev; 1248 struct drm_property *scaling_mode_property; 1249 int i; 1250 const unsigned valid_scaling_mode_mask = 1251 (1U << ARRAY_SIZE(drm_scaling_mode_enum_list)) - 1; 1252 1253 if (WARN_ON(hweight32(scaling_mode_mask) < 2 || 1254 scaling_mode_mask & ~valid_scaling_mode_mask)) 1255 return -EINVAL; 1256 1257 scaling_mode_property = 1258 drm_property_create(dev, DRM_MODE_PROP_ENUM, "scaling mode", 1259 hweight32(scaling_mode_mask)); 1260 1261 if (!scaling_mode_property) 1262 return -ENOMEM; 1263 1264 for (i = 0; i < ARRAY_SIZE(drm_scaling_mode_enum_list); i++) { 1265 int ret; 1266 1267 if (!(BIT(i) & scaling_mode_mask)) 1268 continue; 1269 1270 ret = drm_property_add_enum(scaling_mode_property, 1271 drm_scaling_mode_enum_list[i].type, 1272 drm_scaling_mode_enum_list[i].name); 1273 1274 if (ret) { 1275 drm_property_destroy(dev, scaling_mode_property); 1276 1277 return ret; 1278 } 1279 } 1280 1281 drm_object_attach_property(&connector->base, 1282 scaling_mode_property, 0); 1283 1284 connector->scaling_mode_property = scaling_mode_property; 1285 1286 return 0; 1287 } 1288 EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property); 1289 1290 /** 1291 * drm_connector_attach_content_protection_property - attach content protection 1292 * property 1293 * 1294 * @connector: connector to attach CP property on. 1295 * 1296 * This is used to add support for content protection on select connectors. 1297 * Content Protection is intentionally vague to allow for different underlying 1298 * technologies, however it is most implemented by HDCP. 1299 * 1300 * The content protection will be set to &drm_connector_state.content_protection 1301 * 1302 * Returns: 1303 * Zero on success, negative errno on failure. 1304 */ 1305 int drm_connector_attach_content_protection_property( 1306 struct drm_connector *connector) 1307 { 1308 struct drm_device *dev = connector->dev; 1309 struct drm_property *prop; 1310 1311 prop = drm_property_create_enum(dev, 0, "Content Protection", 1312 drm_cp_enum_list, 1313 ARRAY_SIZE(drm_cp_enum_list)); 1314 if (!prop) 1315 return -ENOMEM; 1316 1317 drm_object_attach_property(&connector->base, prop, 1318 DRM_MODE_CONTENT_PROTECTION_UNDESIRED); 1319 1320 connector->content_protection_property = prop; 1321 1322 return 0; 1323 } 1324 EXPORT_SYMBOL(drm_connector_attach_content_protection_property); 1325 1326 /** 1327 * drm_mode_create_aspect_ratio_property - create aspect ratio property 1328 * @dev: DRM device 1329 * 1330 * Called by a driver the first time it's needed, must be attached to desired 1331 * connectors. 1332 * 1333 * Returns: 1334 * Zero on success, negative errno on failure. 1335 */ 1336 int drm_mode_create_aspect_ratio_property(struct drm_device *dev) 1337 { 1338 if (dev->mode_config.aspect_ratio_property) 1339 return 0; 1340 1341 dev->mode_config.aspect_ratio_property = 1342 drm_property_create_enum(dev, 0, "aspect ratio", 1343 drm_aspect_ratio_enum_list, 1344 ARRAY_SIZE(drm_aspect_ratio_enum_list)); 1345 1346 if (dev->mode_config.aspect_ratio_property == NULL) 1347 return -ENOMEM; 1348 1349 return 0; 1350 } 1351 EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property); 1352 1353 /** 1354 * drm_mode_create_content_type_property - create content type property 1355 * @dev: DRM device 1356 * 1357 * Called by a driver the first time it's needed, must be attached to desired 1358 * connectors. 1359 * 1360 * Returns: 1361 * Zero on success, negative errno on failure. 1362 */ 1363 int drm_mode_create_content_type_property(struct drm_device *dev) 1364 { 1365 if (dev->mode_config.content_type_property) 1366 return 0; 1367 1368 dev->mode_config.content_type_property = 1369 drm_property_create_enum(dev, 0, "content type", 1370 drm_content_type_enum_list, 1371 ARRAY_SIZE(drm_content_type_enum_list)); 1372 1373 if (dev->mode_config.content_type_property == NULL) 1374 return -ENOMEM; 1375 1376 return 0; 1377 } 1378 EXPORT_SYMBOL(drm_mode_create_content_type_property); 1379 1380 /** 1381 * drm_mode_create_suggested_offset_properties - create suggests offset properties 1382 * @dev: DRM device 1383 * 1384 * Create the the suggested x/y offset property for connectors. 1385 */ 1386 int drm_mode_create_suggested_offset_properties(struct drm_device *dev) 1387 { 1388 if (dev->mode_config.suggested_x_property && dev->mode_config.suggested_y_property) 1389 return 0; 1390 1391 dev->mode_config.suggested_x_property = 1392 drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested X", 0, 0xffffffff); 1393 1394 dev->mode_config.suggested_y_property = 1395 drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested Y", 0, 0xffffffff); 1396 1397 if (dev->mode_config.suggested_x_property == NULL || 1398 dev->mode_config.suggested_y_property == NULL) 1399 return -ENOMEM; 1400 return 0; 1401 } 1402 EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties); 1403 1404 /** 1405 * drm_mode_connector_set_path_property - set tile property on connector 1406 * @connector: connector to set property on. 1407 * @path: path to use for property; must not be NULL. 1408 * 1409 * This creates a property to expose to userspace to specify a 1410 * connector path. This is mainly used for DisplayPort MST where 1411 * connectors have a topology and we want to allow userspace to give 1412 * them more meaningful names. 1413 * 1414 * Returns: 1415 * Zero on success, negative errno on failure. 1416 */ 1417 int drm_mode_connector_set_path_property(struct drm_connector *connector, 1418 const char *path) 1419 { 1420 struct drm_device *dev = connector->dev; 1421 int ret; 1422 1423 ret = drm_property_replace_global_blob(dev, 1424 &connector->path_blob_ptr, 1425 strlen(path) + 1, 1426 path, 1427 &connector->base, 1428 dev->mode_config.path_property); 1429 return ret; 1430 } 1431 EXPORT_SYMBOL(drm_mode_connector_set_path_property); 1432 1433 /** 1434 * drm_mode_connector_set_tile_property - set tile property on connector 1435 * @connector: connector to set property on. 1436 * 1437 * This looks up the tile information for a connector, and creates a 1438 * property for userspace to parse if it exists. The property is of 1439 * the form of 8 integers using ':' as a separator. 1440 * 1441 * Returns: 1442 * Zero on success, errno on failure. 1443 */ 1444 int drm_mode_connector_set_tile_property(struct drm_connector *connector) 1445 { 1446 struct drm_device *dev = connector->dev; 1447 char tile[256]; 1448 int ret; 1449 1450 if (!connector->has_tile) { 1451 ret = drm_property_replace_global_blob(dev, 1452 &connector->tile_blob_ptr, 1453 0, 1454 NULL, 1455 &connector->base, 1456 dev->mode_config.tile_property); 1457 return ret; 1458 } 1459 1460 snprintf(tile, 256, "%d:%d:%d:%d:%d:%d:%d:%d", 1461 connector->tile_group->id, connector->tile_is_single_monitor, 1462 connector->num_h_tile, connector->num_v_tile, 1463 connector->tile_h_loc, connector->tile_v_loc, 1464 connector->tile_h_size, connector->tile_v_size); 1465 1466 ret = drm_property_replace_global_blob(dev, 1467 &connector->tile_blob_ptr, 1468 strlen(tile) + 1, 1469 tile, 1470 &connector->base, 1471 dev->mode_config.tile_property); 1472 return ret; 1473 } 1474 EXPORT_SYMBOL(drm_mode_connector_set_tile_property); 1475 1476 /** 1477 * drm_mode_connector_update_edid_property - update the edid property of a connector 1478 * @connector: drm connector 1479 * @edid: new value of the edid property 1480 * 1481 * This function creates a new blob modeset object and assigns its id to the 1482 * connector's edid property. 1483 * 1484 * Returns: 1485 * Zero on success, negative errno on failure. 1486 */ 1487 int drm_mode_connector_update_edid_property(struct drm_connector *connector, 1488 const struct edid *edid) 1489 { 1490 struct drm_device *dev = connector->dev; 1491 size_t size = 0; 1492 int ret; 1493 1494 /* ignore requests to set edid when overridden */ 1495 if (connector->override_edid) 1496 return 0; 1497 1498 if (edid) 1499 size = EDID_LENGTH * (1 + edid->extensions); 1500 1501 /* Set the display info, using edid if available, otherwise 1502 * reseting the values to defaults. This duplicates the work 1503 * done in drm_add_edid_modes, but that function is not 1504 * consistently called before this one in all drivers and the 1505 * computation is cheap enough that it seems better to 1506 * duplicate it rather than attempt to ensure some arbitrary 1507 * ordering of calls. 1508 */ 1509 if (edid) 1510 drm_add_display_info(connector, edid); 1511 else 1512 drm_reset_display_info(connector); 1513 1514 drm_object_property_set_value(&connector->base, 1515 dev->mode_config.non_desktop_property, 1516 connector->display_info.non_desktop); 1517 1518 ret = drm_property_replace_global_blob(dev, 1519 &connector->edid_blob_ptr, 1520 size, 1521 edid, 1522 &connector->base, 1523 dev->mode_config.edid_property); 1524 return ret; 1525 } 1526 EXPORT_SYMBOL(drm_mode_connector_update_edid_property); 1527 1528 /** 1529 * drm_mode_connector_set_link_status_property - Set link status property of a connector 1530 * @connector: drm connector 1531 * @link_status: new value of link status property (0: Good, 1: Bad) 1532 * 1533 * In usual working scenario, this link status property will always be set to 1534 * "GOOD". If something fails during or after a mode set, the kernel driver 1535 * may set this link status property to "BAD". The caller then needs to send a 1536 * hotplug uevent for userspace to re-check the valid modes through 1537 * GET_CONNECTOR_IOCTL and retry modeset. 1538 * 1539 * Note: Drivers cannot rely on userspace to support this property and 1540 * issue a modeset. As such, they may choose to handle issues (like 1541 * re-training a link) without userspace's intervention. 1542 * 1543 * The reason for adding this property is to handle link training failures, but 1544 * it is not limited to DP or link training. For example, if we implement 1545 * asynchronous setcrtc, this property can be used to report any failures in that. 1546 */ 1547 void drm_mode_connector_set_link_status_property(struct drm_connector *connector, 1548 uint64_t link_status) 1549 { 1550 struct drm_device *dev = connector->dev; 1551 1552 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 1553 connector->state->link_status = link_status; 1554 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1555 } 1556 EXPORT_SYMBOL(drm_mode_connector_set_link_status_property); 1557 1558 /** 1559 * drm_connector_init_panel_orientation_property - 1560 * initialize the connecters panel_orientation property 1561 * @connector: connector for which to init the panel-orientation property. 1562 * @width: width in pixels of the panel, used for panel quirk detection 1563 * @height: height in pixels of the panel, used for panel quirk detection 1564 * 1565 * This function should only be called for built-in panels, after setting 1566 * connector->display_info.panel_orientation first (if known). 1567 * 1568 * This function will check for platform specific (e.g. DMI based) quirks 1569 * overriding display_info.panel_orientation first, then if panel_orientation 1570 * is not DRM_MODE_PANEL_ORIENTATION_UNKNOWN it will attach the 1571 * "panel orientation" property to the connector. 1572 * 1573 * Returns: 1574 * Zero on success, negative errno on failure. 1575 */ 1576 int drm_connector_init_panel_orientation_property( 1577 struct drm_connector *connector, int width, int height) 1578 { 1579 struct drm_device *dev = connector->dev; 1580 struct drm_display_info *info = &connector->display_info; 1581 struct drm_property *prop; 1582 int orientation_quirk; 1583 1584 orientation_quirk = drm_get_panel_orientation_quirk(width, height); 1585 if (orientation_quirk != DRM_MODE_PANEL_ORIENTATION_UNKNOWN) 1586 info->panel_orientation = orientation_quirk; 1587 1588 if (info->panel_orientation == DRM_MODE_PANEL_ORIENTATION_UNKNOWN) 1589 return 0; 1590 1591 prop = dev->mode_config.panel_orientation_property; 1592 if (!prop) { 1593 prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE, 1594 "panel orientation", 1595 drm_panel_orientation_enum_list, 1596 ARRAY_SIZE(drm_panel_orientation_enum_list)); 1597 if (!prop) 1598 return -ENOMEM; 1599 1600 dev->mode_config.panel_orientation_property = prop; 1601 } 1602 1603 drm_object_attach_property(&connector->base, prop, 1604 info->panel_orientation); 1605 return 0; 1606 } 1607 EXPORT_SYMBOL(drm_connector_init_panel_orientation_property); 1608 1609 int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj, 1610 struct drm_property *property, 1611 uint64_t value) 1612 { 1613 int ret = -EINVAL; 1614 struct drm_connector *connector = obj_to_connector(obj); 1615 1616 /* Do DPMS ourselves */ 1617 if (property == connector->dev->mode_config.dpms_property) { 1618 ret = (*connector->funcs->dpms)(connector, (int)value); 1619 } else if (connector->funcs->set_property) 1620 ret = connector->funcs->set_property(connector, property, value); 1621 1622 if (!ret) 1623 drm_object_property_set_value(&connector->base, property, value); 1624 return ret; 1625 } 1626 1627 int drm_mode_connector_property_set_ioctl(struct drm_device *dev, 1628 void *data, struct drm_file *file_priv) 1629 { 1630 struct drm_mode_connector_set_property *conn_set_prop = data; 1631 struct drm_mode_obj_set_property obj_set_prop = { 1632 .value = conn_set_prop->value, 1633 .prop_id = conn_set_prop->prop_id, 1634 .obj_id = conn_set_prop->connector_id, 1635 .obj_type = DRM_MODE_OBJECT_CONNECTOR 1636 }; 1637 1638 /* It does all the locking and checking we need */ 1639 return drm_mode_obj_set_property_ioctl(dev, &obj_set_prop, file_priv); 1640 } 1641 1642 static struct drm_encoder *drm_connector_get_encoder(struct drm_connector *connector) 1643 { 1644 /* For atomic drivers only state objects are synchronously updated and 1645 * protected by modeset locks, so check those first. */ 1646 if (connector->state) 1647 return connector->state->best_encoder; 1648 return connector->encoder; 1649 } 1650 1651 static bool 1652 drm_mode_expose_to_userspace(const struct drm_display_mode *mode, 1653 const struct list_head *export_list, 1654 const struct drm_file *file_priv) 1655 { 1656 /* 1657 * If user-space hasn't configured the driver to expose the stereo 3D 1658 * modes, don't expose them. 1659 */ 1660 if (!file_priv->stereo_allowed && drm_mode_is_stereo(mode)) 1661 return false; 1662 /* 1663 * If user-space hasn't configured the driver to expose the modes 1664 * with aspect-ratio, don't expose them. However if such a mode 1665 * is unique, let it be exposed, but reset the aspect-ratio flags 1666 * while preparing the list of user-modes. 1667 */ 1668 if (!file_priv->aspect_ratio_allowed) { 1669 struct drm_display_mode *mode_itr; 1670 1671 list_for_each_entry(mode_itr, export_list, export_head) 1672 if (drm_mode_match(mode_itr, mode, 1673 DRM_MODE_MATCH_TIMINGS | 1674 DRM_MODE_MATCH_CLOCK | 1675 DRM_MODE_MATCH_FLAGS | 1676 DRM_MODE_MATCH_3D_FLAGS)) 1677 return false; 1678 } 1679 1680 return true; 1681 } 1682 1683 int drm_mode_getconnector(struct drm_device *dev, void *data, 1684 struct drm_file *file_priv) 1685 { 1686 struct drm_mode_get_connector *out_resp = data; 1687 struct drm_connector *connector; 1688 struct drm_encoder *encoder; 1689 struct drm_display_mode *mode; 1690 int mode_count = 0; 1691 int encoders_count = 0; 1692 int ret = 0; 1693 int copied = 0; 1694 int i; 1695 struct drm_mode_modeinfo u_mode; 1696 struct drm_mode_modeinfo __user *mode_ptr; 1697 uint32_t __user *encoder_ptr; 1698 LIST_HEAD(export_list); 1699 1700 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 1701 return -EINVAL; 1702 1703 memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo)); 1704 1705 connector = drm_connector_lookup(dev, file_priv, out_resp->connector_id); 1706 if (!connector) 1707 return -ENOENT; 1708 1709 for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) 1710 if (connector->encoder_ids[i] != 0) 1711 encoders_count++; 1712 1713 if ((out_resp->count_encoders >= encoders_count) && encoders_count) { 1714 copied = 0; 1715 encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr); 1716 for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) { 1717 if (connector->encoder_ids[i] != 0) { 1718 if (put_user(connector->encoder_ids[i], 1719 encoder_ptr + copied)) { 1720 ret = -EFAULT; 1721 goto out; 1722 } 1723 copied++; 1724 } 1725 } 1726 } 1727 out_resp->count_encoders = encoders_count; 1728 1729 out_resp->connector_id = connector->base.id; 1730 out_resp->connector_type = connector->connector_type; 1731 out_resp->connector_type_id = connector->connector_type_id; 1732 1733 mutex_lock(&dev->mode_config.mutex); 1734 if (out_resp->count_modes == 0) { 1735 connector->funcs->fill_modes(connector, 1736 dev->mode_config.max_width, 1737 dev->mode_config.max_height); 1738 } 1739 1740 out_resp->mm_width = connector->display_info.width_mm; 1741 out_resp->mm_height = connector->display_info.height_mm; 1742 out_resp->subpixel = connector->display_info.subpixel_order; 1743 out_resp->connection = connector->status; 1744 1745 /* delayed so we get modes regardless of pre-fill_modes state */ 1746 list_for_each_entry(mode, &connector->modes, head) 1747 if (drm_mode_expose_to_userspace(mode, &export_list, 1748 file_priv)) { 1749 list_add_tail(&mode->export_head, &export_list); 1750 mode_count++; 1751 } 1752 1753 /* 1754 * This ioctl is called twice, once to determine how much space is 1755 * needed, and the 2nd time to fill it. 1756 * The modes that need to be exposed to the user are maintained in the 1757 * 'export_list'. When the ioctl is called first time to determine the, 1758 * space, the export_list gets filled, to find the no.of modes. In the 1759 * 2nd time, the user modes are filled, one by one from the export_list. 1760 */ 1761 if ((out_resp->count_modes >= mode_count) && mode_count) { 1762 copied = 0; 1763 mode_ptr = (struct drm_mode_modeinfo __user *)(unsigned long)out_resp->modes_ptr; 1764 list_for_each_entry(mode, &export_list, export_head) { 1765 drm_mode_convert_to_umode(&u_mode, mode); 1766 /* 1767 * Reset aspect ratio flags of user-mode, if modes with 1768 * aspect-ratio are not supported. 1769 */ 1770 if (!file_priv->aspect_ratio_allowed) 1771 u_mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK; 1772 if (copy_to_user(mode_ptr + copied, 1773 &u_mode, sizeof(u_mode))) { 1774 ret = -EFAULT; 1775 mutex_unlock(&dev->mode_config.mutex); 1776 1777 goto out; 1778 } 1779 copied++; 1780 } 1781 } 1782 out_resp->count_modes = mode_count; 1783 mutex_unlock(&dev->mode_config.mutex); 1784 1785 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 1786 encoder = drm_connector_get_encoder(connector); 1787 if (encoder) 1788 out_resp->encoder_id = encoder->base.id; 1789 else 1790 out_resp->encoder_id = 0; 1791 1792 /* Only grab properties after probing, to make sure EDID and other 1793 * properties reflect the latest status. */ 1794 ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic, 1795 (uint32_t __user *)(unsigned long)(out_resp->props_ptr), 1796 (uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr), 1797 &out_resp->count_props); 1798 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1799 1800 out: 1801 drm_connector_put(connector); 1802 1803 return ret; 1804 } 1805 1806 1807 /** 1808 * DOC: Tile group 1809 * 1810 * Tile groups are used to represent tiled monitors with a unique integer 1811 * identifier. Tiled monitors using DisplayID v1.3 have a unique 8-byte handle, 1812 * we store this in a tile group, so we have a common identifier for all tiles 1813 * in a monitor group. The property is called "TILE". Drivers can manage tile 1814 * groups using drm_mode_create_tile_group(), drm_mode_put_tile_group() and 1815 * drm_mode_get_tile_group(). But this is only needed for internal panels where 1816 * the tile group information is exposed through a non-standard way. 1817 */ 1818 1819 static void drm_tile_group_free(struct kref *kref) 1820 { 1821 struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount); 1822 struct drm_device *dev = tg->dev; 1823 mutex_lock(&dev->mode_config.idr_mutex); 1824 idr_remove(&dev->mode_config.tile_idr, tg->id); 1825 mutex_unlock(&dev->mode_config.idr_mutex); 1826 kfree(tg); 1827 } 1828 1829 /** 1830 * drm_mode_put_tile_group - drop a reference to a tile group. 1831 * @dev: DRM device 1832 * @tg: tile group to drop reference to. 1833 * 1834 * drop reference to tile group and free if 0. 1835 */ 1836 void drm_mode_put_tile_group(struct drm_device *dev, 1837 struct drm_tile_group *tg) 1838 { 1839 kref_put(&tg->refcount, drm_tile_group_free); 1840 } 1841 EXPORT_SYMBOL(drm_mode_put_tile_group); 1842 1843 /** 1844 * drm_mode_get_tile_group - get a reference to an existing tile group 1845 * @dev: DRM device 1846 * @topology: 8-bytes unique per monitor. 1847 * 1848 * Use the unique bytes to get a reference to an existing tile group. 1849 * 1850 * RETURNS: 1851 * tile group or NULL if not found. 1852 */ 1853 struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev, 1854 char topology[8]) 1855 { 1856 struct drm_tile_group *tg; 1857 int id; 1858 mutex_lock(&dev->mode_config.idr_mutex); 1859 idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) { 1860 if (!memcmp(tg->group_data, topology, 8)) { 1861 if (!kref_get_unless_zero(&tg->refcount)) 1862 tg = NULL; 1863 mutex_unlock(&dev->mode_config.idr_mutex); 1864 return tg; 1865 } 1866 } 1867 mutex_unlock(&dev->mode_config.idr_mutex); 1868 return NULL; 1869 } 1870 EXPORT_SYMBOL(drm_mode_get_tile_group); 1871 1872 /** 1873 * drm_mode_create_tile_group - create a tile group from a displayid description 1874 * @dev: DRM device 1875 * @topology: 8-bytes unique per monitor. 1876 * 1877 * Create a tile group for the unique monitor, and get a unique 1878 * identifier for the tile group. 1879 * 1880 * RETURNS: 1881 * new tile group or error. 1882 */ 1883 struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev, 1884 char topology[8]) 1885 { 1886 struct drm_tile_group *tg; 1887 int ret; 1888 1889 tg = kzalloc(sizeof(*tg), GFP_KERNEL); 1890 if (!tg) 1891 return ERR_PTR(-ENOMEM); 1892 1893 kref_init(&tg->refcount); 1894 memcpy(tg->group_data, topology, 8); 1895 tg->dev = dev; 1896 1897 mutex_lock(&dev->mode_config.idr_mutex); 1898 ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL); 1899 if (ret >= 0) { 1900 tg->id = ret; 1901 } else { 1902 kfree(tg); 1903 tg = ERR_PTR(ret); 1904 } 1905 1906 mutex_unlock(&dev->mode_config.idr_mutex); 1907 return tg; 1908 } 1909 EXPORT_SYMBOL(drm_mode_create_tile_group); 1910