1 /* 2 * Copyright (c) 2006-2009 Red Hat Inc. 3 * Copyright (c) 2006-2008 Intel Corporation 4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> 5 * 6 * DRM framebuffer helper functions 7 * 8 * Permission to use, copy, modify, distribute, and sell this software and its 9 * documentation for any purpose is hereby granted without fee, provided that 10 * the above copyright notice appear in all copies and that both that copyright 11 * notice and this permission notice appear in supporting documentation, and 12 * that the name of the copyright holders not be used in advertising or 13 * publicity pertaining to distribution of the software without specific, 14 * written prior permission. The copyright holders make no representations 15 * about the suitability of this software for any purpose. It is provided "as 16 * is" without express or implied warranty. 17 * 18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 24 * OF THIS SOFTWARE. 25 * 26 * Authors: 27 * Dave Airlie <airlied@linux.ie> 28 * Jesse Barnes <jesse.barnes@intel.com> 29 */ 30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 31 32 #include <linux/kernel.h> 33 #include <linux/sysrq.h> 34 #include <linux/slab.h> 35 #include <linux/fb.h> 36 #include <linux/module.h> 37 #include <drm/drmP.h> 38 #include <drm/drm_crtc.h> 39 #include <drm/drm_fb_helper.h> 40 #include <drm/drm_crtc_helper.h> 41 42 static LIST_HEAD(kernel_fb_helper_list); 43 44 /** 45 * DOC: fbdev helpers 46 * 47 * The fb helper functions are useful to provide an fbdev on top of a drm kernel 48 * mode setting driver. They can be used mostly independently from the crtc 49 * helper functions used by many drivers to implement the kernel mode setting 50 * interfaces. 51 * 52 * Initialization is done as a four-step process with drm_fb_helper_prepare(), 53 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and 54 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the 55 * default behaviour can override the third step with their own code. 56 * Teardown is done with drm_fb_helper_fini(). 57 * 58 * At runtime drivers should restore the fbdev console by calling 59 * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback. 60 * They should also notify the fb helper code from updates to the output 61 * configuration by calling drm_fb_helper_hotplug_event(). For easier 62 * integration with the output polling code in drm_crtc_helper.c the modeset 63 * code provides a ->output_poll_changed callback. 64 * 65 * All other functions exported by the fb helper library can be used to 66 * implement the fbdev driver interface by the driver. 67 * 68 * It is possible, though perhaps somewhat tricky, to implement race-free 69 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare() 70 * helper must be called first to initialize the minimum required to make 71 * hotplug detection work. Drivers also need to make sure to properly set up 72 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init() 73 * it is safe to enable interrupts and start processing hotplug events. At the 74 * same time, drivers should initialize all modeset objects such as CRTCs, 75 * encoders and connectors. To finish up the fbdev helper initialization, the 76 * drm_fb_helper_init() function is called. To probe for all attached displays 77 * and set up an initial configuration using the detected hardware, drivers 78 * should call drm_fb_helper_single_add_all_connectors() followed by 79 * drm_fb_helper_initial_config(). 80 */ 81 82 /** 83 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev 84 * emulation helper 85 * @fb_helper: fbdev initialized with drm_fb_helper_init 86 * 87 * This functions adds all the available connectors for use with the given 88 * fb_helper. This is a separate step to allow drivers to freely assign 89 * connectors to the fbdev, e.g. if some are reserved for special purposes or 90 * not adequate to be used for the fbcon. 91 * 92 * This function is protected against concurrent connector hotadds/removals 93 * using drm_fb_helper_add_one_connector() and 94 * drm_fb_helper_remove_one_connector(). 95 */ 96 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) 97 { 98 struct drm_device *dev = fb_helper->dev; 99 struct drm_connector *connector; 100 int i; 101 102 mutex_lock(&dev->mode_config.mutex); 103 drm_for_each_connector(connector, dev) { 104 struct drm_fb_helper_connector *fb_helper_connector; 105 106 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL); 107 if (!fb_helper_connector) 108 goto fail; 109 110 fb_helper_connector->connector = connector; 111 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; 112 } 113 mutex_unlock(&dev->mode_config.mutex); 114 return 0; 115 fail: 116 for (i = 0; i < fb_helper->connector_count; i++) { 117 kfree(fb_helper->connector_info[i]); 118 fb_helper->connector_info[i] = NULL; 119 } 120 fb_helper->connector_count = 0; 121 mutex_unlock(&dev->mode_config.mutex); 122 123 return -ENOMEM; 124 } 125 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); 126 127 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector) 128 { 129 struct drm_fb_helper_connector **temp; 130 struct drm_fb_helper_connector *fb_helper_connector; 131 132 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex)); 133 if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) { 134 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL); 135 if (!temp) 136 return -ENOMEM; 137 138 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1; 139 fb_helper->connector_info = temp; 140 } 141 142 143 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL); 144 if (!fb_helper_connector) 145 return -ENOMEM; 146 147 fb_helper_connector->connector = connector; 148 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; 149 return 0; 150 } 151 EXPORT_SYMBOL(drm_fb_helper_add_one_connector); 152 153 static void remove_from_modeset(struct drm_mode_set *set, 154 struct drm_connector *connector) 155 { 156 int i, j; 157 158 for (i = 0; i < set->num_connectors; i++) { 159 if (set->connectors[i] == connector) 160 break; 161 } 162 163 if (i == set->num_connectors) 164 return; 165 166 for (j = i + 1; j < set->num_connectors; j++) { 167 set->connectors[j - 1] = set->connectors[j]; 168 } 169 set->num_connectors--; 170 171 /* 172 * TODO maybe need to makes sure we set it back to !=NULL somewhere? 173 */ 174 if (set->num_connectors == 0) { 175 set->fb = NULL; 176 drm_mode_destroy(connector->dev, set->mode); 177 set->mode = NULL; 178 } 179 } 180 181 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 182 struct drm_connector *connector) 183 { 184 struct drm_fb_helper_connector *fb_helper_connector; 185 int i, j; 186 187 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex)); 188 189 for (i = 0; i < fb_helper->connector_count; i++) { 190 if (fb_helper->connector_info[i]->connector == connector) 191 break; 192 } 193 194 if (i == fb_helper->connector_count) 195 return -EINVAL; 196 fb_helper_connector = fb_helper->connector_info[i]; 197 198 for (j = i + 1; j < fb_helper->connector_count; j++) { 199 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j]; 200 } 201 fb_helper->connector_count--; 202 kfree(fb_helper_connector); 203 204 /* also cleanup dangling references to the connector: */ 205 for (i = 0; i < fb_helper->crtc_count; i++) 206 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector); 207 208 return 0; 209 } 210 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector); 211 212 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper) 213 { 214 uint16_t *r_base, *g_base, *b_base; 215 int i; 216 217 if (helper->funcs->gamma_get == NULL) 218 return; 219 220 r_base = crtc->gamma_store; 221 g_base = r_base + crtc->gamma_size; 222 b_base = g_base + crtc->gamma_size; 223 224 for (i = 0; i < crtc->gamma_size; i++) 225 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i); 226 } 227 228 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc) 229 { 230 uint16_t *r_base, *g_base, *b_base; 231 232 if (crtc->funcs->gamma_set == NULL) 233 return; 234 235 r_base = crtc->gamma_store; 236 g_base = r_base + crtc->gamma_size; 237 b_base = g_base + crtc->gamma_size; 238 239 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size); 240 } 241 242 /** 243 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter 244 * @info: fbdev registered by the helper 245 */ 246 int drm_fb_helper_debug_enter(struct fb_info *info) 247 { 248 struct drm_fb_helper *helper = info->par; 249 const struct drm_crtc_helper_funcs *funcs; 250 int i; 251 252 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 253 for (i = 0; i < helper->crtc_count; i++) { 254 struct drm_mode_set *mode_set = 255 &helper->crtc_info[i].mode_set; 256 257 if (!mode_set->crtc->enabled) 258 continue; 259 260 funcs = mode_set->crtc->helper_private; 261 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper); 262 funcs->mode_set_base_atomic(mode_set->crtc, 263 mode_set->fb, 264 mode_set->x, 265 mode_set->y, 266 ENTER_ATOMIC_MODE_SET); 267 } 268 } 269 270 return 0; 271 } 272 EXPORT_SYMBOL(drm_fb_helper_debug_enter); 273 274 /* Find the real fb for a given fb helper CRTC */ 275 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc) 276 { 277 struct drm_device *dev = crtc->dev; 278 struct drm_crtc *c; 279 280 drm_for_each_crtc(c, dev) { 281 if (crtc->base.id == c->base.id) 282 return c->primary->fb; 283 } 284 285 return NULL; 286 } 287 288 /** 289 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave 290 * @info: fbdev registered by the helper 291 */ 292 int drm_fb_helper_debug_leave(struct fb_info *info) 293 { 294 struct drm_fb_helper *helper = info->par; 295 struct drm_crtc *crtc; 296 const struct drm_crtc_helper_funcs *funcs; 297 struct drm_framebuffer *fb; 298 int i; 299 300 for (i = 0; i < helper->crtc_count; i++) { 301 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; 302 crtc = mode_set->crtc; 303 funcs = crtc->helper_private; 304 fb = drm_mode_config_fb(crtc); 305 306 if (!crtc->enabled) 307 continue; 308 309 if (!fb) { 310 DRM_ERROR("no fb to restore??\n"); 311 continue; 312 } 313 314 drm_fb_helper_restore_lut_atomic(mode_set->crtc); 315 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, 316 crtc->y, LEAVE_ATOMIC_MODE_SET); 317 } 318 319 return 0; 320 } 321 EXPORT_SYMBOL(drm_fb_helper_debug_leave); 322 323 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper) 324 { 325 struct drm_device *dev = fb_helper->dev; 326 struct drm_plane *plane; 327 bool error = false; 328 int i; 329 330 drm_warn_on_modeset_not_all_locked(dev); 331 332 drm_for_each_plane(plane, dev) { 333 if (plane->type != DRM_PLANE_TYPE_PRIMARY) 334 drm_plane_force_disable(plane); 335 336 if (dev->mode_config.rotation_property) { 337 drm_mode_plane_set_obj_prop(plane, 338 dev->mode_config.rotation_property, 339 BIT(DRM_ROTATE_0)); 340 } 341 } 342 343 for (i = 0; i < fb_helper->crtc_count; i++) { 344 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 345 struct drm_crtc *crtc = mode_set->crtc; 346 int ret; 347 348 if (crtc->funcs->cursor_set2) { 349 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0); 350 if (ret) 351 error = true; 352 } else if (crtc->funcs->cursor_set) { 353 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0); 354 if (ret) 355 error = true; 356 } 357 358 ret = drm_mode_set_config_internal(mode_set); 359 if (ret) 360 error = true; 361 } 362 return error; 363 } 364 365 /** 366 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration 367 * @fb_helper: fbcon to restore 368 * 369 * This should be called from driver's drm ->lastclose callback 370 * when implementing an fbcon on top of kms using this helper. This ensures that 371 * the user isn't greeted with a black screen when e.g. X dies. 372 */ 373 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) 374 { 375 struct drm_device *dev = fb_helper->dev; 376 bool ret; 377 bool do_delayed = false; 378 379 drm_modeset_lock_all(dev); 380 ret = restore_fbdev_mode(fb_helper); 381 382 do_delayed = fb_helper->delayed_hotplug; 383 if (do_delayed) 384 fb_helper->delayed_hotplug = false; 385 drm_modeset_unlock_all(dev); 386 387 if (do_delayed) 388 drm_fb_helper_hotplug_event(fb_helper); 389 return ret; 390 } 391 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked); 392 393 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper) 394 { 395 struct drm_device *dev = fb_helper->dev; 396 struct drm_crtc *crtc; 397 int bound = 0, crtcs_bound = 0; 398 399 /* Sometimes user space wants everything disabled, so don't steal the 400 * display if there's a master. */ 401 if (dev->primary->master) 402 return false; 403 404 drm_for_each_crtc(crtc, dev) { 405 if (crtc->primary->fb) 406 crtcs_bound++; 407 if (crtc->primary->fb == fb_helper->fb) 408 bound++; 409 } 410 411 if (bound < crtcs_bound) 412 return false; 413 414 return true; 415 } 416 417 #ifdef CONFIG_MAGIC_SYSRQ 418 /* 419 * restore fbcon display for all kms driver's using this helper, used for sysrq 420 * and panic handling. 421 */ 422 static bool drm_fb_helper_force_kernel_mode(void) 423 { 424 bool ret, error = false; 425 struct drm_fb_helper *helper; 426 427 if (list_empty(&kernel_fb_helper_list)) 428 return false; 429 430 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 431 struct drm_device *dev = helper->dev; 432 433 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) 434 continue; 435 436 drm_modeset_lock_all(dev); 437 ret = restore_fbdev_mode(helper); 438 if (ret) 439 error = true; 440 drm_modeset_unlock_all(dev); 441 } 442 return error; 443 } 444 445 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) 446 { 447 bool ret; 448 ret = drm_fb_helper_force_kernel_mode(); 449 if (ret == true) 450 DRM_ERROR("Failed to restore crtc configuration\n"); 451 } 452 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); 453 454 static void drm_fb_helper_sysrq(int dummy1) 455 { 456 schedule_work(&drm_fb_helper_restore_work); 457 } 458 459 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { 460 .handler = drm_fb_helper_sysrq, 461 .help_msg = "force-fb(V)", 462 .action_msg = "Restore framebuffer console", 463 }; 464 #else 465 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; 466 #endif 467 468 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) 469 { 470 struct drm_fb_helper *fb_helper = info->par; 471 struct drm_device *dev = fb_helper->dev; 472 struct drm_crtc *crtc; 473 struct drm_connector *connector; 474 int i, j; 475 476 /* 477 * For each CRTC in this fb, turn the connectors on/off. 478 */ 479 drm_modeset_lock_all(dev); 480 if (!drm_fb_helper_is_bound(fb_helper)) { 481 drm_modeset_unlock_all(dev); 482 return; 483 } 484 485 for (i = 0; i < fb_helper->crtc_count; i++) { 486 crtc = fb_helper->crtc_info[i].mode_set.crtc; 487 488 if (!crtc->enabled) 489 continue; 490 491 /* Walk the connectors & encoders on this fb turning them on/off */ 492 for (j = 0; j < fb_helper->connector_count; j++) { 493 connector = fb_helper->connector_info[j]->connector; 494 connector->funcs->dpms(connector, dpms_mode); 495 drm_object_property_set_value(&connector->base, 496 dev->mode_config.dpms_property, dpms_mode); 497 } 498 } 499 drm_modeset_unlock_all(dev); 500 } 501 502 /** 503 * drm_fb_helper_blank - implementation for ->fb_blank 504 * @blank: desired blanking state 505 * @info: fbdev registered by the helper 506 */ 507 int drm_fb_helper_blank(int blank, struct fb_info *info) 508 { 509 if (oops_in_progress) 510 return -EBUSY; 511 512 switch (blank) { 513 /* Display: On; HSync: On, VSync: On */ 514 case FB_BLANK_UNBLANK: 515 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); 516 break; 517 /* Display: Off; HSync: On, VSync: On */ 518 case FB_BLANK_NORMAL: 519 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 520 break; 521 /* Display: Off; HSync: Off, VSync: On */ 522 case FB_BLANK_HSYNC_SUSPEND: 523 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 524 break; 525 /* Display: Off; HSync: On, VSync: Off */ 526 case FB_BLANK_VSYNC_SUSPEND: 527 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); 528 break; 529 /* Display: Off; HSync: Off, VSync: Off */ 530 case FB_BLANK_POWERDOWN: 531 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); 532 break; 533 } 534 return 0; 535 } 536 EXPORT_SYMBOL(drm_fb_helper_blank); 537 538 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) 539 { 540 int i; 541 542 for (i = 0; i < helper->connector_count; i++) 543 kfree(helper->connector_info[i]); 544 kfree(helper->connector_info); 545 for (i = 0; i < helper->crtc_count; i++) { 546 kfree(helper->crtc_info[i].mode_set.connectors); 547 if (helper->crtc_info[i].mode_set.mode) 548 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode); 549 } 550 kfree(helper->crtc_info); 551 } 552 553 /** 554 * drm_fb_helper_prepare - setup a drm_fb_helper structure 555 * @dev: DRM device 556 * @helper: driver-allocated fbdev helper structure to set up 557 * @funcs: pointer to structure of functions associate with this helper 558 * 559 * Sets up the bare minimum to make the framebuffer helper usable. This is 560 * useful to implement race-free initialization of the polling helpers. 561 */ 562 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, 563 const struct drm_fb_helper_funcs *funcs) 564 { 565 INIT_LIST_HEAD(&helper->kernel_fb_list); 566 helper->funcs = funcs; 567 helper->dev = dev; 568 } 569 EXPORT_SYMBOL(drm_fb_helper_prepare); 570 571 /** 572 * drm_fb_helper_init - initialize a drm_fb_helper structure 573 * @dev: drm device 574 * @fb_helper: driver-allocated fbdev helper structure to initialize 575 * @crtc_count: maximum number of crtcs to support in this fbdev emulation 576 * @max_conn_count: max connector count 577 * 578 * This allocates the structures for the fbdev helper with the given limits. 579 * Note that this won't yet touch the hardware (through the driver interfaces) 580 * nor register the fbdev. This is only done in drm_fb_helper_initial_config() 581 * to allow driver writes more control over the exact init sequence. 582 * 583 * Drivers must call drm_fb_helper_prepare() before calling this function. 584 * 585 * RETURNS: 586 * Zero if everything went ok, nonzero otherwise. 587 */ 588 int drm_fb_helper_init(struct drm_device *dev, 589 struct drm_fb_helper *fb_helper, 590 int crtc_count, int max_conn_count) 591 { 592 struct drm_crtc *crtc; 593 int i; 594 595 if (!max_conn_count) 596 return -EINVAL; 597 598 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); 599 if (!fb_helper->crtc_info) 600 return -ENOMEM; 601 602 fb_helper->crtc_count = crtc_count; 603 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); 604 if (!fb_helper->connector_info) { 605 kfree(fb_helper->crtc_info); 606 return -ENOMEM; 607 } 608 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector; 609 fb_helper->connector_count = 0; 610 611 for (i = 0; i < crtc_count; i++) { 612 fb_helper->crtc_info[i].mode_set.connectors = 613 kcalloc(max_conn_count, 614 sizeof(struct drm_connector *), 615 GFP_KERNEL); 616 617 if (!fb_helper->crtc_info[i].mode_set.connectors) 618 goto out_free; 619 fb_helper->crtc_info[i].mode_set.num_connectors = 0; 620 } 621 622 i = 0; 623 drm_for_each_crtc(crtc, dev) { 624 fb_helper->crtc_info[i].mode_set.crtc = crtc; 625 i++; 626 } 627 628 return 0; 629 out_free: 630 drm_fb_helper_crtc_free(fb_helper); 631 return -ENOMEM; 632 } 633 EXPORT_SYMBOL(drm_fb_helper_init); 634 635 /** 636 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members 637 * @fb_helper: driver-allocated fbdev helper 638 * 639 * A helper to alloc fb_info and the members cmap and apertures. Called 640 * by the driver within the fb_probe fb_helper callback function. 641 * 642 * RETURNS: 643 * fb_info pointer if things went okay, pointer containing error code 644 * otherwise 645 */ 646 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) 647 { 648 struct device *dev = fb_helper->dev->dev; 649 struct fb_info *info; 650 int ret; 651 652 info = framebuffer_alloc(0, dev); 653 if (!info) 654 return ERR_PTR(-ENOMEM); 655 656 ret = fb_alloc_cmap(&info->cmap, 256, 0); 657 if (ret) 658 goto err_release; 659 660 info->apertures = alloc_apertures(1); 661 if (!info->apertures) { 662 ret = -ENOMEM; 663 goto err_free_cmap; 664 } 665 666 fb_helper->fbdev = info; 667 668 return info; 669 670 err_free_cmap: 671 fb_dealloc_cmap(&info->cmap); 672 err_release: 673 framebuffer_release(info); 674 return ERR_PTR(ret); 675 } 676 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi); 677 678 /** 679 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device 680 * @fb_helper: driver-allocated fbdev helper 681 * 682 * A wrapper around unregister_framebuffer, to release the fb_info 683 * framebuffer device 684 */ 685 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) 686 { 687 if (fb_helper && fb_helper->fbdev) 688 unregister_framebuffer(fb_helper->fbdev); 689 } 690 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi); 691 692 /** 693 * drm_fb_helper_release_fbi - dealloc fb_info and its members 694 * @fb_helper: driver-allocated fbdev helper 695 * 696 * A helper to free memory taken by fb_info and the members cmap and 697 * apertures 698 */ 699 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper) 700 { 701 if (fb_helper) { 702 struct fb_info *info = fb_helper->fbdev; 703 704 if (info) { 705 if (info->cmap.len) 706 fb_dealloc_cmap(&info->cmap); 707 framebuffer_release(info); 708 } 709 710 fb_helper->fbdev = NULL; 711 } 712 } 713 EXPORT_SYMBOL(drm_fb_helper_release_fbi); 714 715 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) 716 { 717 if (!list_empty(&fb_helper->kernel_fb_list)) { 718 list_del(&fb_helper->kernel_fb_list); 719 if (list_empty(&kernel_fb_helper_list)) { 720 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 721 } 722 } 723 724 drm_fb_helper_crtc_free(fb_helper); 725 726 } 727 EXPORT_SYMBOL(drm_fb_helper_fini); 728 729 /** 730 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer 731 * @fb_helper: driver-allocated fbdev helper 732 * 733 * A wrapper around unlink_framebuffer implemented by fbdev core 734 */ 735 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) 736 { 737 if (fb_helper && fb_helper->fbdev) 738 unlink_framebuffer(fb_helper->fbdev); 739 } 740 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); 741 742 /** 743 * drm_fb_helper_sys_read - wrapper around fb_sys_read 744 * @info: fb_info struct pointer 745 * @buf: userspace buffer to read from framebuffer memory 746 * @count: number of bytes to read from framebuffer memory 747 * @ppos: read offset within framebuffer memory 748 * 749 * A wrapper around fb_sys_read implemented by fbdev core 750 */ 751 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, 752 size_t count, loff_t *ppos) 753 { 754 return fb_sys_read(info, buf, count, ppos); 755 } 756 EXPORT_SYMBOL(drm_fb_helper_sys_read); 757 758 /** 759 * drm_fb_helper_sys_write - wrapper around fb_sys_write 760 * @info: fb_info struct pointer 761 * @buf: userspace buffer to write to framebuffer memory 762 * @count: number of bytes to write to framebuffer memory 763 * @ppos: write offset within framebuffer memory 764 * 765 * A wrapper around fb_sys_write implemented by fbdev core 766 */ 767 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, 768 size_t count, loff_t *ppos) 769 { 770 return fb_sys_write(info, buf, count, ppos); 771 } 772 EXPORT_SYMBOL(drm_fb_helper_sys_write); 773 774 /** 775 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect 776 * @info: fbdev registered by the helper 777 * @rect: info about rectangle to fill 778 * 779 * A wrapper around sys_fillrect implemented by fbdev core 780 */ 781 void drm_fb_helper_sys_fillrect(struct fb_info *info, 782 const struct fb_fillrect *rect) 783 { 784 sys_fillrect(info, rect); 785 } 786 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); 787 788 /** 789 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea 790 * @info: fbdev registered by the helper 791 * @area: info about area to copy 792 * 793 * A wrapper around sys_copyarea implemented by fbdev core 794 */ 795 void drm_fb_helper_sys_copyarea(struct fb_info *info, 796 const struct fb_copyarea *area) 797 { 798 sys_copyarea(info, area); 799 } 800 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); 801 802 /** 803 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit 804 * @info: fbdev registered by the helper 805 * @image: info about image to blit 806 * 807 * A wrapper around sys_imageblit implemented by fbdev core 808 */ 809 void drm_fb_helper_sys_imageblit(struct fb_info *info, 810 const struct fb_image *image) 811 { 812 sys_imageblit(info, image); 813 } 814 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); 815 816 /** 817 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect 818 * @info: fbdev registered by the helper 819 * @rect: info about rectangle to fill 820 * 821 * A wrapper around cfb_imageblit implemented by fbdev core 822 */ 823 void drm_fb_helper_cfb_fillrect(struct fb_info *info, 824 const struct fb_fillrect *rect) 825 { 826 cfb_fillrect(info, rect); 827 } 828 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); 829 830 /** 831 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea 832 * @info: fbdev registered by the helper 833 * @area: info about area to copy 834 * 835 * A wrapper around cfb_copyarea implemented by fbdev core 836 */ 837 void drm_fb_helper_cfb_copyarea(struct fb_info *info, 838 const struct fb_copyarea *area) 839 { 840 cfb_copyarea(info, area); 841 } 842 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); 843 844 /** 845 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit 846 * @info: fbdev registered by the helper 847 * @image: info about image to blit 848 * 849 * A wrapper around cfb_imageblit implemented by fbdev core 850 */ 851 void drm_fb_helper_cfb_imageblit(struct fb_info *info, 852 const struct fb_image *image) 853 { 854 cfb_imageblit(info, image); 855 } 856 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); 857 858 /** 859 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend 860 * @fb_helper: driver-allocated fbdev helper 861 * @state: desired state, zero to resume, non-zero to suspend 862 * 863 * A wrapper around fb_set_suspend implemented by fbdev core 864 */ 865 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state) 866 { 867 if (fb_helper && fb_helper->fbdev) 868 fb_set_suspend(fb_helper->fbdev, state); 869 } 870 EXPORT_SYMBOL(drm_fb_helper_set_suspend); 871 872 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green, 873 u16 blue, u16 regno, struct fb_info *info) 874 { 875 struct drm_fb_helper *fb_helper = info->par; 876 struct drm_framebuffer *fb = fb_helper->fb; 877 int pindex; 878 879 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 880 u32 *palette; 881 u32 value; 882 /* place color in psuedopalette */ 883 if (regno > 16) 884 return -EINVAL; 885 palette = (u32 *)info->pseudo_palette; 886 red >>= (16 - info->var.red.length); 887 green >>= (16 - info->var.green.length); 888 blue >>= (16 - info->var.blue.length); 889 value = (red << info->var.red.offset) | 890 (green << info->var.green.offset) | 891 (blue << info->var.blue.offset); 892 if (info->var.transp.length > 0) { 893 u32 mask = (1 << info->var.transp.length) - 1; 894 mask <<= info->var.transp.offset; 895 value |= mask; 896 } 897 palette[regno] = value; 898 return 0; 899 } 900 901 /* 902 * The driver really shouldn't advertise pseudo/directcolor 903 * visuals if it can't deal with the palette. 904 */ 905 if (WARN_ON(!fb_helper->funcs->gamma_set || 906 !fb_helper->funcs->gamma_get)) 907 return -EINVAL; 908 909 pindex = regno; 910 911 if (fb->bits_per_pixel == 16) { 912 pindex = regno << 3; 913 914 if (fb->depth == 16 && regno > 63) 915 return -EINVAL; 916 if (fb->depth == 15 && regno > 31) 917 return -EINVAL; 918 919 if (fb->depth == 16) { 920 u16 r, g, b; 921 int i; 922 if (regno < 32) { 923 for (i = 0; i < 8; i++) 924 fb_helper->funcs->gamma_set(crtc, red, 925 green, blue, pindex + i); 926 } 927 928 fb_helper->funcs->gamma_get(crtc, &r, 929 &g, &b, 930 pindex >> 1); 931 932 for (i = 0; i < 4; i++) 933 fb_helper->funcs->gamma_set(crtc, r, 934 green, b, 935 (pindex >> 1) + i); 936 } 937 } 938 939 if (fb->depth != 16) 940 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex); 941 return 0; 942 } 943 944 /** 945 * drm_fb_helper_setcmap - implementation for ->fb_setcmap 946 * @cmap: cmap to set 947 * @info: fbdev registered by the helper 948 */ 949 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) 950 { 951 struct drm_fb_helper *fb_helper = info->par; 952 struct drm_device *dev = fb_helper->dev; 953 const struct drm_crtc_helper_funcs *crtc_funcs; 954 u16 *red, *green, *blue, *transp; 955 struct drm_crtc *crtc; 956 int i, j, rc = 0; 957 int start; 958 959 if (oops_in_progress) 960 return -EBUSY; 961 962 drm_modeset_lock_all(dev); 963 if (!drm_fb_helper_is_bound(fb_helper)) { 964 drm_modeset_unlock_all(dev); 965 return -EBUSY; 966 } 967 968 for (i = 0; i < fb_helper->crtc_count; i++) { 969 crtc = fb_helper->crtc_info[i].mode_set.crtc; 970 crtc_funcs = crtc->helper_private; 971 972 red = cmap->red; 973 green = cmap->green; 974 blue = cmap->blue; 975 transp = cmap->transp; 976 start = cmap->start; 977 978 for (j = 0; j < cmap->len; j++) { 979 u16 hred, hgreen, hblue, htransp = 0xffff; 980 981 hred = *red++; 982 hgreen = *green++; 983 hblue = *blue++; 984 985 if (transp) 986 htransp = *transp++; 987 988 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info); 989 if (rc) 990 goto out; 991 } 992 if (crtc_funcs->load_lut) 993 crtc_funcs->load_lut(crtc); 994 } 995 out: 996 drm_modeset_unlock_all(dev); 997 return rc; 998 } 999 EXPORT_SYMBOL(drm_fb_helper_setcmap); 1000 1001 /** 1002 * drm_fb_helper_check_var - implementation for ->fb_check_var 1003 * @var: screeninfo to check 1004 * @info: fbdev registered by the helper 1005 */ 1006 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 1007 struct fb_info *info) 1008 { 1009 struct drm_fb_helper *fb_helper = info->par; 1010 struct drm_framebuffer *fb = fb_helper->fb; 1011 int depth; 1012 1013 if (var->pixclock != 0 || in_dbg_master()) 1014 return -EINVAL; 1015 1016 /* Need to resize the fb object !!! */ 1017 if (var->bits_per_pixel > fb->bits_per_pixel || 1018 var->xres > fb->width || var->yres > fb->height || 1019 var->xres_virtual > fb->width || var->yres_virtual > fb->height) { 1020 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb " 1021 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", 1022 var->xres, var->yres, var->bits_per_pixel, 1023 var->xres_virtual, var->yres_virtual, 1024 fb->width, fb->height, fb->bits_per_pixel); 1025 return -EINVAL; 1026 } 1027 1028 switch (var->bits_per_pixel) { 1029 case 16: 1030 depth = (var->green.length == 6) ? 16 : 15; 1031 break; 1032 case 32: 1033 depth = (var->transp.length > 0) ? 32 : 24; 1034 break; 1035 default: 1036 depth = var->bits_per_pixel; 1037 break; 1038 } 1039 1040 switch (depth) { 1041 case 8: 1042 var->red.offset = 0; 1043 var->green.offset = 0; 1044 var->blue.offset = 0; 1045 var->red.length = 8; 1046 var->green.length = 8; 1047 var->blue.length = 8; 1048 var->transp.length = 0; 1049 var->transp.offset = 0; 1050 break; 1051 case 15: 1052 var->red.offset = 10; 1053 var->green.offset = 5; 1054 var->blue.offset = 0; 1055 var->red.length = 5; 1056 var->green.length = 5; 1057 var->blue.length = 5; 1058 var->transp.length = 1; 1059 var->transp.offset = 15; 1060 break; 1061 case 16: 1062 var->red.offset = 11; 1063 var->green.offset = 5; 1064 var->blue.offset = 0; 1065 var->red.length = 5; 1066 var->green.length = 6; 1067 var->blue.length = 5; 1068 var->transp.length = 0; 1069 var->transp.offset = 0; 1070 break; 1071 case 24: 1072 var->red.offset = 16; 1073 var->green.offset = 8; 1074 var->blue.offset = 0; 1075 var->red.length = 8; 1076 var->green.length = 8; 1077 var->blue.length = 8; 1078 var->transp.length = 0; 1079 var->transp.offset = 0; 1080 break; 1081 case 32: 1082 var->red.offset = 16; 1083 var->green.offset = 8; 1084 var->blue.offset = 0; 1085 var->red.length = 8; 1086 var->green.length = 8; 1087 var->blue.length = 8; 1088 var->transp.length = 8; 1089 var->transp.offset = 24; 1090 break; 1091 default: 1092 return -EINVAL; 1093 } 1094 return 0; 1095 } 1096 EXPORT_SYMBOL(drm_fb_helper_check_var); 1097 1098 /** 1099 * drm_fb_helper_set_par - implementation for ->fb_set_par 1100 * @info: fbdev registered by the helper 1101 * 1102 * This will let fbcon do the mode init and is called at initialization time by 1103 * the fbdev core when registering the driver, and later on through the hotplug 1104 * callback. 1105 */ 1106 int drm_fb_helper_set_par(struct fb_info *info) 1107 { 1108 struct drm_fb_helper *fb_helper = info->par; 1109 struct fb_var_screeninfo *var = &info->var; 1110 1111 if (oops_in_progress) 1112 return -EBUSY; 1113 1114 if (var->pixclock != 0) { 1115 DRM_ERROR("PIXEL CLOCK SET\n"); 1116 return -EINVAL; 1117 } 1118 1119 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); 1120 1121 return 0; 1122 } 1123 EXPORT_SYMBOL(drm_fb_helper_set_par); 1124 1125 /** 1126 * drm_fb_helper_pan_display - implementation for ->fb_pan_display 1127 * @var: updated screen information 1128 * @info: fbdev registered by the helper 1129 */ 1130 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 1131 struct fb_info *info) 1132 { 1133 struct drm_fb_helper *fb_helper = info->par; 1134 struct drm_device *dev = fb_helper->dev; 1135 struct drm_mode_set *modeset; 1136 int ret = 0; 1137 int i; 1138 1139 if (oops_in_progress) 1140 return -EBUSY; 1141 1142 drm_modeset_lock_all(dev); 1143 if (!drm_fb_helper_is_bound(fb_helper)) { 1144 drm_modeset_unlock_all(dev); 1145 return -EBUSY; 1146 } 1147 1148 for (i = 0; i < fb_helper->crtc_count; i++) { 1149 modeset = &fb_helper->crtc_info[i].mode_set; 1150 1151 modeset->x = var->xoffset; 1152 modeset->y = var->yoffset; 1153 1154 if (modeset->num_connectors) { 1155 ret = drm_mode_set_config_internal(modeset); 1156 if (!ret) { 1157 info->var.xoffset = var->xoffset; 1158 info->var.yoffset = var->yoffset; 1159 } 1160 } 1161 } 1162 drm_modeset_unlock_all(dev); 1163 return ret; 1164 } 1165 EXPORT_SYMBOL(drm_fb_helper_pan_display); 1166 1167 /* 1168 * Allocates the backing storage and sets up the fbdev info structure through 1169 * the ->fb_probe callback and then registers the fbdev and sets up the panic 1170 * notifier. 1171 */ 1172 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, 1173 int preferred_bpp) 1174 { 1175 int ret = 0; 1176 int crtc_count = 0; 1177 int i; 1178 struct fb_info *info; 1179 struct drm_fb_helper_surface_size sizes; 1180 int gamma_size = 0; 1181 1182 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); 1183 sizes.surface_depth = 24; 1184 sizes.surface_bpp = 32; 1185 sizes.fb_width = (unsigned)-1; 1186 sizes.fb_height = (unsigned)-1; 1187 1188 /* if driver picks 8 or 16 by default use that 1189 for both depth/bpp */ 1190 if (preferred_bpp != sizes.surface_bpp) 1191 sizes.surface_depth = sizes.surface_bpp = preferred_bpp; 1192 1193 /* first up get a count of crtcs now in use and new min/maxes width/heights */ 1194 for (i = 0; i < fb_helper->connector_count; i++) { 1195 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; 1196 struct drm_cmdline_mode *cmdline_mode; 1197 1198 cmdline_mode = &fb_helper_conn->connector->cmdline_mode; 1199 1200 if (cmdline_mode->bpp_specified) { 1201 switch (cmdline_mode->bpp) { 1202 case 8: 1203 sizes.surface_depth = sizes.surface_bpp = 8; 1204 break; 1205 case 15: 1206 sizes.surface_depth = 15; 1207 sizes.surface_bpp = 16; 1208 break; 1209 case 16: 1210 sizes.surface_depth = sizes.surface_bpp = 16; 1211 break; 1212 case 24: 1213 sizes.surface_depth = sizes.surface_bpp = 24; 1214 break; 1215 case 32: 1216 sizes.surface_depth = 24; 1217 sizes.surface_bpp = 32; 1218 break; 1219 } 1220 break; 1221 } 1222 } 1223 1224 crtc_count = 0; 1225 for (i = 0; i < fb_helper->crtc_count; i++) { 1226 struct drm_display_mode *desired_mode; 1227 struct drm_mode_set *mode_set; 1228 int x, y, j; 1229 /* in case of tile group, are we the last tile vert or horiz? 1230 * If no tile group you are always the last one both vertically 1231 * and horizontally 1232 */ 1233 bool lastv = true, lasth = true; 1234 1235 desired_mode = fb_helper->crtc_info[i].desired_mode; 1236 mode_set = &fb_helper->crtc_info[i].mode_set; 1237 1238 if (!desired_mode) 1239 continue; 1240 1241 crtc_count++; 1242 1243 x = fb_helper->crtc_info[i].x; 1244 y = fb_helper->crtc_info[i].y; 1245 1246 if (gamma_size == 0) 1247 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; 1248 1249 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width); 1250 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height); 1251 1252 for (j = 0; j < mode_set->num_connectors; j++) { 1253 struct drm_connector *connector = mode_set->connectors[j]; 1254 if (connector->has_tile) { 1255 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1)); 1256 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1)); 1257 /* cloning to multiple tiles is just crazy-talk, so: */ 1258 break; 1259 } 1260 } 1261 1262 if (lasth) 1263 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width); 1264 if (lastv) 1265 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height); 1266 } 1267 1268 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { 1269 /* hmm everyone went away - assume VGA cable just fell out 1270 and will come back later. */ 1271 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n"); 1272 sizes.fb_width = sizes.surface_width = 1024; 1273 sizes.fb_height = sizes.surface_height = 768; 1274 } 1275 1276 /* push down into drivers */ 1277 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); 1278 if (ret < 0) 1279 return ret; 1280 1281 info = fb_helper->fbdev; 1282 1283 /* 1284 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug 1285 * events, but at init time drm_setup_crtcs needs to be called before 1286 * the fb is allocated (since we need to figure out the desired size of 1287 * the fb before we can allocate it ...). Hence we need to fix things up 1288 * here again. 1289 */ 1290 for (i = 0; i < fb_helper->crtc_count; i++) 1291 if (fb_helper->crtc_info[i].mode_set.num_connectors) 1292 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; 1293 1294 1295 info->var.pixclock = 0; 1296 if (register_framebuffer(info) < 0) 1297 return -EINVAL; 1298 1299 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n", 1300 info->node, info->fix.id); 1301 1302 if (list_empty(&kernel_fb_helper_list)) { 1303 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 1304 } 1305 1306 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 1307 1308 return 0; 1309 } 1310 1311 /** 1312 * drm_fb_helper_fill_fix - initializes fixed fbdev information 1313 * @info: fbdev registered by the helper 1314 * @pitch: desired pitch 1315 * @depth: desired depth 1316 * 1317 * Helper to fill in the fixed fbdev information useful for a non-accelerated 1318 * fbdev emulations. Drivers which support acceleration methods which impose 1319 * additional constraints need to set up their own limits. 1320 * 1321 * Drivers should call this (or their equivalent setup code) from their 1322 * ->fb_probe callback. 1323 */ 1324 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 1325 uint32_t depth) 1326 { 1327 info->fix.type = FB_TYPE_PACKED_PIXELS; 1328 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : 1329 FB_VISUAL_TRUECOLOR; 1330 info->fix.mmio_start = 0; 1331 info->fix.mmio_len = 0; 1332 info->fix.type_aux = 0; 1333 info->fix.xpanstep = 1; /* doing it in hw */ 1334 info->fix.ypanstep = 1; /* doing it in hw */ 1335 info->fix.ywrapstep = 0; 1336 info->fix.accel = FB_ACCEL_NONE; 1337 1338 info->fix.line_length = pitch; 1339 return; 1340 } 1341 EXPORT_SYMBOL(drm_fb_helper_fill_fix); 1342 1343 /** 1344 * drm_fb_helper_fill_var - initalizes variable fbdev information 1345 * @info: fbdev instance to set up 1346 * @fb_helper: fb helper instance to use as template 1347 * @fb_width: desired fb width 1348 * @fb_height: desired fb height 1349 * 1350 * Sets up the variable fbdev metainformation from the given fb helper instance 1351 * and the drm framebuffer allocated in fb_helper->fb. 1352 * 1353 * Drivers should call this (or their equivalent setup code) from their 1354 * ->fb_probe callback after having allocated the fbdev backing 1355 * storage framebuffer. 1356 */ 1357 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 1358 uint32_t fb_width, uint32_t fb_height) 1359 { 1360 struct drm_framebuffer *fb = fb_helper->fb; 1361 info->pseudo_palette = fb_helper->pseudo_palette; 1362 info->var.xres_virtual = fb->width; 1363 info->var.yres_virtual = fb->height; 1364 info->var.bits_per_pixel = fb->bits_per_pixel; 1365 info->var.accel_flags = FB_ACCELF_TEXT; 1366 info->var.xoffset = 0; 1367 info->var.yoffset = 0; 1368 info->var.activate = FB_ACTIVATE_NOW; 1369 info->var.height = -1; 1370 info->var.width = -1; 1371 1372 switch (fb->depth) { 1373 case 8: 1374 info->var.red.offset = 0; 1375 info->var.green.offset = 0; 1376 info->var.blue.offset = 0; 1377 info->var.red.length = 8; /* 8bit DAC */ 1378 info->var.green.length = 8; 1379 info->var.blue.length = 8; 1380 info->var.transp.offset = 0; 1381 info->var.transp.length = 0; 1382 break; 1383 case 15: 1384 info->var.red.offset = 10; 1385 info->var.green.offset = 5; 1386 info->var.blue.offset = 0; 1387 info->var.red.length = 5; 1388 info->var.green.length = 5; 1389 info->var.blue.length = 5; 1390 info->var.transp.offset = 15; 1391 info->var.transp.length = 1; 1392 break; 1393 case 16: 1394 info->var.red.offset = 11; 1395 info->var.green.offset = 5; 1396 info->var.blue.offset = 0; 1397 info->var.red.length = 5; 1398 info->var.green.length = 6; 1399 info->var.blue.length = 5; 1400 info->var.transp.offset = 0; 1401 break; 1402 case 24: 1403 info->var.red.offset = 16; 1404 info->var.green.offset = 8; 1405 info->var.blue.offset = 0; 1406 info->var.red.length = 8; 1407 info->var.green.length = 8; 1408 info->var.blue.length = 8; 1409 info->var.transp.offset = 0; 1410 info->var.transp.length = 0; 1411 break; 1412 case 32: 1413 info->var.red.offset = 16; 1414 info->var.green.offset = 8; 1415 info->var.blue.offset = 0; 1416 info->var.red.length = 8; 1417 info->var.green.length = 8; 1418 info->var.blue.length = 8; 1419 info->var.transp.offset = 24; 1420 info->var.transp.length = 8; 1421 break; 1422 default: 1423 break; 1424 } 1425 1426 info->var.xres = fb_width; 1427 info->var.yres = fb_height; 1428 } 1429 EXPORT_SYMBOL(drm_fb_helper_fill_var); 1430 1431 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, 1432 uint32_t maxX, 1433 uint32_t maxY) 1434 { 1435 struct drm_connector *connector; 1436 int count = 0; 1437 int i; 1438 1439 for (i = 0; i < fb_helper->connector_count; i++) { 1440 connector = fb_helper->connector_info[i]->connector; 1441 count += connector->funcs->fill_modes(connector, maxX, maxY); 1442 } 1443 1444 return count; 1445 } 1446 1447 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) 1448 { 1449 struct drm_display_mode *mode; 1450 1451 list_for_each_entry(mode, &fb_connector->connector->modes, head) { 1452 if (mode->hdisplay > width || 1453 mode->vdisplay > height) 1454 continue; 1455 if (mode->type & DRM_MODE_TYPE_PREFERRED) 1456 return mode; 1457 } 1458 return NULL; 1459 } 1460 EXPORT_SYMBOL(drm_has_preferred_mode); 1461 1462 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) 1463 { 1464 return fb_connector->connector->cmdline_mode.specified; 1465 } 1466 1467 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 1468 int width, int height) 1469 { 1470 struct drm_cmdline_mode *cmdline_mode; 1471 struct drm_display_mode *mode; 1472 bool prefer_non_interlace; 1473 1474 cmdline_mode = &fb_helper_conn->connector->cmdline_mode; 1475 if (cmdline_mode->specified == false) 1476 return NULL; 1477 1478 /* attempt to find a matching mode in the list of modes 1479 * we have gotten so far, if not add a CVT mode that conforms 1480 */ 1481 if (cmdline_mode->rb || cmdline_mode->margins) 1482 goto create_mode; 1483 1484 prefer_non_interlace = !cmdline_mode->interlace; 1485 again: 1486 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1487 /* check width/height */ 1488 if (mode->hdisplay != cmdline_mode->xres || 1489 mode->vdisplay != cmdline_mode->yres) 1490 continue; 1491 1492 if (cmdline_mode->refresh_specified) { 1493 if (mode->vrefresh != cmdline_mode->refresh) 1494 continue; 1495 } 1496 1497 if (cmdline_mode->interlace) { 1498 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) 1499 continue; 1500 } else if (prefer_non_interlace) { 1501 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 1502 continue; 1503 } 1504 return mode; 1505 } 1506 1507 if (prefer_non_interlace) { 1508 prefer_non_interlace = false; 1509 goto again; 1510 } 1511 1512 create_mode: 1513 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, 1514 cmdline_mode); 1515 list_add(&mode->head, &fb_helper_conn->connector->modes); 1516 return mode; 1517 } 1518 EXPORT_SYMBOL(drm_pick_cmdline_mode); 1519 1520 static bool drm_connector_enabled(struct drm_connector *connector, bool strict) 1521 { 1522 bool enable; 1523 1524 if (strict) 1525 enable = connector->status == connector_status_connected; 1526 else 1527 enable = connector->status != connector_status_disconnected; 1528 1529 return enable; 1530 } 1531 1532 static void drm_enable_connectors(struct drm_fb_helper *fb_helper, 1533 bool *enabled) 1534 { 1535 bool any_enabled = false; 1536 struct drm_connector *connector; 1537 int i = 0; 1538 1539 for (i = 0; i < fb_helper->connector_count; i++) { 1540 connector = fb_helper->connector_info[i]->connector; 1541 enabled[i] = drm_connector_enabled(connector, true); 1542 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, 1543 enabled[i] ? "yes" : "no"); 1544 any_enabled |= enabled[i]; 1545 } 1546 1547 if (any_enabled) 1548 return; 1549 1550 for (i = 0; i < fb_helper->connector_count; i++) { 1551 connector = fb_helper->connector_info[i]->connector; 1552 enabled[i] = drm_connector_enabled(connector, false); 1553 } 1554 } 1555 1556 static bool drm_target_cloned(struct drm_fb_helper *fb_helper, 1557 struct drm_display_mode **modes, 1558 struct drm_fb_offset *offsets, 1559 bool *enabled, int width, int height) 1560 { 1561 int count, i, j; 1562 bool can_clone = false; 1563 struct drm_fb_helper_connector *fb_helper_conn; 1564 struct drm_display_mode *dmt_mode, *mode; 1565 1566 /* only contemplate cloning in the single crtc case */ 1567 if (fb_helper->crtc_count > 1) 1568 return false; 1569 1570 count = 0; 1571 for (i = 0; i < fb_helper->connector_count; i++) { 1572 if (enabled[i]) 1573 count++; 1574 } 1575 1576 /* only contemplate cloning if more than one connector is enabled */ 1577 if (count <= 1) 1578 return false; 1579 1580 /* check the command line or if nothing common pick 1024x768 */ 1581 can_clone = true; 1582 for (i = 0; i < fb_helper->connector_count; i++) { 1583 if (!enabled[i]) 1584 continue; 1585 fb_helper_conn = fb_helper->connector_info[i]; 1586 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1587 if (!modes[i]) { 1588 can_clone = false; 1589 break; 1590 } 1591 for (j = 0; j < i; j++) { 1592 if (!enabled[j]) 1593 continue; 1594 if (!drm_mode_equal(modes[j], modes[i])) 1595 can_clone = false; 1596 } 1597 } 1598 1599 if (can_clone) { 1600 DRM_DEBUG_KMS("can clone using command line\n"); 1601 return true; 1602 } 1603 1604 /* try and find a 1024x768 mode on each connector */ 1605 can_clone = true; 1606 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false); 1607 1608 for (i = 0; i < fb_helper->connector_count; i++) { 1609 1610 if (!enabled[i]) 1611 continue; 1612 1613 fb_helper_conn = fb_helper->connector_info[i]; 1614 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1615 if (drm_mode_equal(mode, dmt_mode)) 1616 modes[i] = mode; 1617 } 1618 if (!modes[i]) 1619 can_clone = false; 1620 } 1621 1622 if (can_clone) { 1623 DRM_DEBUG_KMS("can clone using 1024x768\n"); 1624 return true; 1625 } 1626 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); 1627 return false; 1628 } 1629 1630 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper, 1631 struct drm_display_mode **modes, 1632 struct drm_fb_offset *offsets, 1633 int idx, 1634 int h_idx, int v_idx) 1635 { 1636 struct drm_fb_helper_connector *fb_helper_conn; 1637 int i; 1638 int hoffset = 0, voffset = 0; 1639 1640 for (i = 0; i < fb_helper->connector_count; i++) { 1641 fb_helper_conn = fb_helper->connector_info[i]; 1642 if (!fb_helper_conn->connector->has_tile) 1643 continue; 1644 1645 if (!modes[i] && (h_idx || v_idx)) { 1646 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i, 1647 fb_helper_conn->connector->base.id); 1648 continue; 1649 } 1650 if (fb_helper_conn->connector->tile_h_loc < h_idx) 1651 hoffset += modes[i]->hdisplay; 1652 1653 if (fb_helper_conn->connector->tile_v_loc < v_idx) 1654 voffset += modes[i]->vdisplay; 1655 } 1656 offsets[idx].x = hoffset; 1657 offsets[idx].y = voffset; 1658 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx); 1659 return 0; 1660 } 1661 1662 static bool drm_target_preferred(struct drm_fb_helper *fb_helper, 1663 struct drm_display_mode **modes, 1664 struct drm_fb_offset *offsets, 1665 bool *enabled, int width, int height) 1666 { 1667 struct drm_fb_helper_connector *fb_helper_conn; 1668 int i; 1669 uint64_t conn_configured = 0, mask; 1670 int tile_pass = 0; 1671 mask = (1 << fb_helper->connector_count) - 1; 1672 retry: 1673 for (i = 0; i < fb_helper->connector_count; i++) { 1674 fb_helper_conn = fb_helper->connector_info[i]; 1675 1676 if (conn_configured & (1 << i)) 1677 continue; 1678 1679 if (enabled[i] == false) { 1680 conn_configured |= (1 << i); 1681 continue; 1682 } 1683 1684 /* first pass over all the untiled connectors */ 1685 if (tile_pass == 0 && fb_helper_conn->connector->has_tile) 1686 continue; 1687 1688 if (tile_pass == 1) { 1689 if (fb_helper_conn->connector->tile_h_loc != 0 || 1690 fb_helper_conn->connector->tile_v_loc != 0) 1691 continue; 1692 1693 } else { 1694 if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 && 1695 fb_helper_conn->connector->tile_v_loc != tile_pass - 1) 1696 /* if this tile_pass doesn't cover any of the tiles - keep going */ 1697 continue; 1698 1699 /* find the tile offsets for this pass - need 1700 to find all tiles left and above */ 1701 drm_get_tile_offsets(fb_helper, modes, offsets, 1702 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc); 1703 } 1704 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", 1705 fb_helper_conn->connector->base.id); 1706 1707 /* got for command line mode first */ 1708 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1709 if (!modes[i]) { 1710 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n", 1711 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0); 1712 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); 1713 } 1714 /* No preferred modes, pick one off the list */ 1715 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { 1716 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) 1717 break; 1718 } 1719 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : 1720 "none"); 1721 conn_configured |= (1 << i); 1722 } 1723 1724 if ((conn_configured & mask) != mask) { 1725 tile_pass++; 1726 goto retry; 1727 } 1728 return true; 1729 } 1730 1731 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, 1732 struct drm_fb_helper_crtc **best_crtcs, 1733 struct drm_display_mode **modes, 1734 int n, int width, int height) 1735 { 1736 int c, o; 1737 struct drm_device *dev = fb_helper->dev; 1738 struct drm_connector *connector; 1739 const struct drm_connector_helper_funcs *connector_funcs; 1740 struct drm_encoder *encoder; 1741 int my_score, best_score, score; 1742 struct drm_fb_helper_crtc **crtcs, *crtc; 1743 struct drm_fb_helper_connector *fb_helper_conn; 1744 1745 if (n == fb_helper->connector_count) 1746 return 0; 1747 1748 fb_helper_conn = fb_helper->connector_info[n]; 1749 connector = fb_helper_conn->connector; 1750 1751 best_crtcs[n] = NULL; 1752 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); 1753 if (modes[n] == NULL) 1754 return best_score; 1755 1756 crtcs = kzalloc(dev->mode_config.num_connector * 1757 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 1758 if (!crtcs) 1759 return best_score; 1760 1761 my_score = 1; 1762 if (connector->status == connector_status_connected) 1763 my_score++; 1764 if (drm_has_cmdline_mode(fb_helper_conn)) 1765 my_score++; 1766 if (drm_has_preferred_mode(fb_helper_conn, width, height)) 1767 my_score++; 1768 1769 connector_funcs = connector->helper_private; 1770 encoder = connector_funcs->best_encoder(connector); 1771 if (!encoder) 1772 goto out; 1773 1774 /* select a crtc for this connector and then attempt to configure 1775 remaining connectors */ 1776 for (c = 0; c < fb_helper->crtc_count; c++) { 1777 crtc = &fb_helper->crtc_info[c]; 1778 1779 if ((encoder->possible_crtcs & (1 << c)) == 0) 1780 continue; 1781 1782 for (o = 0; o < n; o++) 1783 if (best_crtcs[o] == crtc) 1784 break; 1785 1786 if (o < n) { 1787 /* ignore cloning unless only a single crtc */ 1788 if (fb_helper->crtc_count > 1) 1789 continue; 1790 1791 if (!drm_mode_equal(modes[o], modes[n])) 1792 continue; 1793 } 1794 1795 crtcs[n] = crtc; 1796 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); 1797 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, 1798 width, height); 1799 if (score > best_score) { 1800 best_score = score; 1801 memcpy(best_crtcs, crtcs, 1802 dev->mode_config.num_connector * 1803 sizeof(struct drm_fb_helper_crtc *)); 1804 } 1805 } 1806 out: 1807 kfree(crtcs); 1808 return best_score; 1809 } 1810 1811 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) 1812 { 1813 struct drm_device *dev = fb_helper->dev; 1814 struct drm_fb_helper_crtc **crtcs; 1815 struct drm_display_mode **modes; 1816 struct drm_fb_offset *offsets; 1817 struct drm_mode_set *modeset; 1818 bool *enabled; 1819 int width, height; 1820 int i; 1821 1822 DRM_DEBUG_KMS("\n"); 1823 1824 width = dev->mode_config.max_width; 1825 height = dev->mode_config.max_height; 1826 1827 crtcs = kcalloc(dev->mode_config.num_connector, 1828 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 1829 modes = kcalloc(dev->mode_config.num_connector, 1830 sizeof(struct drm_display_mode *), GFP_KERNEL); 1831 offsets = kcalloc(dev->mode_config.num_connector, 1832 sizeof(struct drm_fb_offset), GFP_KERNEL); 1833 enabled = kcalloc(dev->mode_config.num_connector, 1834 sizeof(bool), GFP_KERNEL); 1835 if (!crtcs || !modes || !enabled || !offsets) { 1836 DRM_ERROR("Memory allocation failed\n"); 1837 goto out; 1838 } 1839 1840 1841 drm_enable_connectors(fb_helper, enabled); 1842 1843 if (!(fb_helper->funcs->initial_config && 1844 fb_helper->funcs->initial_config(fb_helper, crtcs, modes, 1845 offsets, 1846 enabled, width, height))) { 1847 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0])); 1848 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0])); 1849 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0])); 1850 1851 if (!drm_target_cloned(fb_helper, modes, offsets, 1852 enabled, width, height) && 1853 !drm_target_preferred(fb_helper, modes, offsets, 1854 enabled, width, height)) 1855 DRM_ERROR("Unable to find initial modes\n"); 1856 1857 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", 1858 width, height); 1859 1860 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); 1861 } 1862 1863 /* need to set the modesets up here for use later */ 1864 /* fill out the connector<->crtc mappings into the modesets */ 1865 for (i = 0; i < fb_helper->crtc_count; i++) { 1866 modeset = &fb_helper->crtc_info[i].mode_set; 1867 modeset->num_connectors = 0; 1868 modeset->fb = NULL; 1869 } 1870 1871 for (i = 0; i < fb_helper->connector_count; i++) { 1872 struct drm_display_mode *mode = modes[i]; 1873 struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; 1874 struct drm_fb_offset *offset = &offsets[i]; 1875 modeset = &fb_crtc->mode_set; 1876 1877 if (mode && fb_crtc) { 1878 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n", 1879 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y); 1880 fb_crtc->desired_mode = mode; 1881 fb_crtc->x = offset->x; 1882 fb_crtc->y = offset->y; 1883 if (modeset->mode) 1884 drm_mode_destroy(dev, modeset->mode); 1885 modeset->mode = drm_mode_duplicate(dev, 1886 fb_crtc->desired_mode); 1887 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector; 1888 modeset->fb = fb_helper->fb; 1889 modeset->x = offset->x; 1890 modeset->y = offset->y; 1891 } 1892 } 1893 1894 /* Clear out any old modes if there are no more connected outputs. */ 1895 for (i = 0; i < fb_helper->crtc_count; i++) { 1896 modeset = &fb_helper->crtc_info[i].mode_set; 1897 if (modeset->num_connectors == 0) { 1898 BUG_ON(modeset->fb); 1899 if (modeset->mode) 1900 drm_mode_destroy(dev, modeset->mode); 1901 modeset->mode = NULL; 1902 } 1903 } 1904 out: 1905 kfree(crtcs); 1906 kfree(modes); 1907 kfree(offsets); 1908 kfree(enabled); 1909 } 1910 1911 /** 1912 * drm_fb_helper_initial_config - setup a sane initial connector configuration 1913 * @fb_helper: fb_helper device struct 1914 * @bpp_sel: bpp value to use for the framebuffer configuration 1915 * 1916 * Scans the CRTCs and connectors and tries to put together an initial setup. 1917 * At the moment, this is a cloned configuration across all heads with 1918 * a new framebuffer object as the backing store. 1919 * 1920 * Note that this also registers the fbdev and so allows userspace to call into 1921 * the driver through the fbdev interfaces. 1922 * 1923 * This function will call down into the ->fb_probe callback to let 1924 * the driver allocate and initialize the fbdev info structure and the drm 1925 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and 1926 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default 1927 * values for the fbdev info structure. 1928 * 1929 * RETURNS: 1930 * Zero if everything went ok, nonzero otherwise. 1931 */ 1932 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) 1933 { 1934 struct drm_device *dev = fb_helper->dev; 1935 int count = 0; 1936 1937 mutex_lock(&dev->mode_config.mutex); 1938 count = drm_fb_helper_probe_connector_modes(fb_helper, 1939 dev->mode_config.max_width, 1940 dev->mode_config.max_height); 1941 mutex_unlock(&dev->mode_config.mutex); 1942 /* 1943 * we shouldn't end up with no modes here. 1944 */ 1945 if (count == 0) 1946 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n"); 1947 1948 drm_setup_crtcs(fb_helper); 1949 1950 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 1951 } 1952 EXPORT_SYMBOL(drm_fb_helper_initial_config); 1953 1954 /** 1955 * drm_fb_helper_hotplug_event - respond to a hotplug notification by 1956 * probing all the outputs attached to the fb 1957 * @fb_helper: the drm_fb_helper 1958 * 1959 * Scan the connectors attached to the fb_helper and try to put together a 1960 * setup after *notification of a change in output configuration. 1961 * 1962 * Called at runtime, takes the mode config locks to be able to check/change the 1963 * modeset configuration. Must be run from process context (which usually means 1964 * either the output polling work or a work item launched from the driver's 1965 * hotplug interrupt). 1966 * 1967 * Note that drivers may call this even before calling 1968 * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows 1969 * for a race-free fbcon setup and will make sure that the fbdev emulation will 1970 * not miss any hotplug events. 1971 * 1972 * RETURNS: 1973 * 0 on success and a non-zero error code otherwise. 1974 */ 1975 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 1976 { 1977 struct drm_device *dev = fb_helper->dev; 1978 u32 max_width, max_height; 1979 1980 mutex_lock(&fb_helper->dev->mode_config.mutex); 1981 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) { 1982 fb_helper->delayed_hotplug = true; 1983 mutex_unlock(&fb_helper->dev->mode_config.mutex); 1984 return 0; 1985 } 1986 DRM_DEBUG_KMS("\n"); 1987 1988 max_width = fb_helper->fb->width; 1989 max_height = fb_helper->fb->height; 1990 1991 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height); 1992 mutex_unlock(&fb_helper->dev->mode_config.mutex); 1993 1994 drm_modeset_lock_all(dev); 1995 drm_setup_crtcs(fb_helper); 1996 drm_modeset_unlock_all(dev); 1997 drm_fb_helper_set_par(fb_helper->fbdev); 1998 1999 return 0; 2000 } 2001 EXPORT_SYMBOL(drm_fb_helper_hotplug_event); 2002 2003 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) 2004 * but the module doesn't depend on any fb console symbols. At least 2005 * attempt to load fbcon to avoid leaving the system without a usable console. 2006 */ 2007 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) 2008 static int __init drm_fb_helper_modinit(void) 2009 { 2010 const char *name = "fbcon"; 2011 struct module *fbcon; 2012 2013 mutex_lock(&module_mutex); 2014 fbcon = find_module(name); 2015 mutex_unlock(&module_mutex); 2016 2017 if (!fbcon) 2018 request_module_nowait(name); 2019 return 0; 2020 } 2021 2022 module_init(drm_fb_helper_modinit); 2023 #endif 2024