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 31 #include <linux/kernel.h> 32 #include <linux/fb.h> 33 #include <linux/module.h> 34 #include <drm/drmP.h> 35 #include <drm/drm_crtc.h> 36 #include <drm/drm_fb_helper.h> 37 #include <drm/drm_crtc_helper.h> 38 #include <drm/drm_atomic.h> 39 #include <drm/drm_atomic_helper.h> 40 41 static bool drm_fbdev_emulation = true; 42 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600); 43 MODULE_PARM_DESC(fbdev_emulation, 44 "Enable legacy fbdev emulation [default=true]"); 45 46 static LINUX_LIST_HEAD(kernel_fb_helper_list); 47 48 /** 49 * DOC: fbdev helpers 50 * 51 * The fb helper functions are useful to provide an fbdev on top of a drm kernel 52 * mode setting driver. They can be used mostly independently from the crtc 53 * helper functions used by many drivers to implement the kernel mode setting 54 * interfaces. 55 * 56 * Initialization is done as a four-step process with drm_fb_helper_prepare(), 57 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and 58 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the 59 * default behaviour can override the third step with their own code. 60 * Teardown is done with drm_fb_helper_fini(). 61 * 62 * At runtime drivers should restore the fbdev console by calling 63 * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback. 64 * They should also notify the fb helper code from updates to the output 65 * configuration by calling drm_fb_helper_hotplug_event(). For easier 66 * integration with the output polling code in drm_crtc_helper.c the modeset 67 * code provides a ->output_poll_changed callback. 68 * 69 * All other functions exported by the fb helper library can be used to 70 * implement the fbdev driver interface by the driver. 71 * 72 * It is possible, though perhaps somewhat tricky, to implement race-free 73 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare() 74 * helper must be called first to initialize the minimum required to make 75 * hotplug detection work. Drivers also need to make sure to properly set up 76 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init() 77 * it is safe to enable interrupts and start processing hotplug events. At the 78 * same time, drivers should initialize all modeset objects such as CRTCs, 79 * encoders and connectors. To finish up the fbdev helper initialization, the 80 * drm_fb_helper_init() function is called. To probe for all attached displays 81 * and set up an initial configuration using the detected hardware, drivers 82 * should call drm_fb_helper_single_add_all_connectors() followed by 83 * drm_fb_helper_initial_config(). 84 * 85 * If &drm_framebuffer_funcs ->dirty is set, the 86 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will 87 * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right 88 * away. This worker then calls the dirty() function ensuring that it will 89 * always run in process context since the fb_*() function could be running in 90 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io 91 * callback it will also schedule dirty_work with the damage collected from the 92 * mmap page writes. 93 */ 94 95 /** 96 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev 97 * emulation helper 98 * @fb_helper: fbdev initialized with drm_fb_helper_init 99 * 100 * This functions adds all the available connectors for use with the given 101 * fb_helper. This is a separate step to allow drivers to freely assign 102 * connectors to the fbdev, e.g. if some are reserved for special purposes or 103 * not adequate to be used for the fbcon. 104 * 105 * This function is protected against concurrent connector hotadds/removals 106 * using drm_fb_helper_add_one_connector() and 107 * drm_fb_helper_remove_one_connector(). 108 */ 109 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) 110 { 111 struct drm_device *dev = fb_helper->dev; 112 struct drm_connector *connector; 113 int i, ret; 114 115 if (!drm_fbdev_emulation) 116 return 0; 117 118 mutex_lock(&dev->mode_config.mutex); 119 drm_for_each_connector(connector, dev) { 120 ret = drm_fb_helper_add_one_connector(fb_helper, connector); 121 122 if (ret) 123 goto fail; 124 } 125 mutex_unlock(&dev->mode_config.mutex); 126 return 0; 127 fail: 128 for (i = 0; i < fb_helper->connector_count; i++) { 129 kfree(fb_helper->connector_info[i]); 130 fb_helper->connector_info[i] = NULL; 131 } 132 fb_helper->connector_count = 0; 133 mutex_unlock(&dev->mode_config.mutex); 134 135 return ret; 136 } 137 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); 138 139 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector) 140 { 141 struct drm_fb_helper_connector **temp; 142 struct drm_fb_helper_connector *fb_helper_connector; 143 144 if (!drm_fbdev_emulation) 145 return 0; 146 147 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex)); 148 if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) { 149 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), M_DRM, M_WAITOK); 150 if (!temp) 151 return -ENOMEM; 152 153 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1; 154 fb_helper->connector_info = temp; 155 } 156 157 158 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL); 159 if (!fb_helper_connector) 160 return -ENOMEM; 161 162 drm_connector_reference(connector); 163 fb_helper_connector->connector = connector; 164 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; 165 return 0; 166 } 167 EXPORT_SYMBOL(drm_fb_helper_add_one_connector); 168 169 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 170 struct drm_connector *connector) 171 { 172 struct drm_fb_helper_connector *fb_helper_connector; 173 int i, j; 174 175 if (!drm_fbdev_emulation) 176 return 0; 177 178 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex)); 179 180 for (i = 0; i < fb_helper->connector_count; i++) { 181 if (fb_helper->connector_info[i]->connector == connector) 182 break; 183 } 184 185 if (i == fb_helper->connector_count) 186 return -EINVAL; 187 fb_helper_connector = fb_helper->connector_info[i]; 188 drm_connector_unreference(fb_helper_connector->connector); 189 190 for (j = i + 1; j < fb_helper->connector_count; j++) { 191 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j]; 192 } 193 fb_helper->connector_count--; 194 kfree(fb_helper_connector); 195 196 return 0; 197 } 198 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector); 199 200 #if 0 201 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper) 202 { 203 uint16_t *r_base, *g_base, *b_base; 204 int i; 205 206 if (helper->funcs->gamma_get == NULL) 207 return; 208 209 r_base = crtc->gamma_store; 210 g_base = r_base + crtc->gamma_size; 211 b_base = g_base + crtc->gamma_size; 212 213 for (i = 0; i < crtc->gamma_size; i++) 214 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i); 215 } 216 217 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc) 218 { 219 uint16_t *r_base, *g_base, *b_base; 220 221 if (crtc->funcs->gamma_set == NULL) 222 return; 223 224 r_base = crtc->gamma_store; 225 g_base = r_base + crtc->gamma_size; 226 b_base = g_base + crtc->gamma_size; 227 228 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size); 229 } 230 #endif 231 232 /** 233 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter 234 * @info: fbdev registered by the helper 235 */ 236 int drm_fb_helper_debug_enter(struct fb_info *info) 237 { 238 struct drm_fb_helper *helper = info->par; 239 const struct drm_crtc_helper_funcs *funcs; 240 int i; 241 242 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 243 for (i = 0; i < helper->crtc_count; i++) { 244 struct drm_mode_set *mode_set = 245 &helper->crtc_info[i].mode_set; 246 247 if (!mode_set->crtc->enabled) 248 continue; 249 250 funcs = mode_set->crtc->helper_private; 251 #if 0 252 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper); 253 #endif 254 funcs->mode_set_base_atomic(mode_set->crtc, 255 mode_set->fb, 256 mode_set->x, 257 mode_set->y, 258 ENTER_ATOMIC_MODE_SET); 259 } 260 } 261 262 return 0; 263 } 264 EXPORT_SYMBOL(drm_fb_helper_debug_enter); 265 266 #if 0 267 /* Find the real fb for a given fb helper CRTC */ 268 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc) 269 { 270 struct drm_device *dev = crtc->dev; 271 struct drm_crtc *c; 272 273 drm_for_each_crtc(c, dev) { 274 if (crtc->base.id == c->base.id) 275 return c->primary->fb; 276 } 277 278 return NULL; 279 } 280 281 /** 282 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave 283 * @info: fbdev registered by the helper 284 */ 285 int drm_fb_helper_debug_leave(struct fb_info *info) 286 { 287 struct drm_fb_helper *helper = info->par; 288 struct drm_crtc *crtc; 289 const struct drm_crtc_helper_funcs *funcs; 290 struct drm_framebuffer *fb; 291 int i; 292 293 for (i = 0; i < helper->crtc_count; i++) { 294 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; 295 crtc = mode_set->crtc; 296 funcs = crtc->helper_private; 297 fb = drm_mode_config_fb(crtc); 298 299 if (!crtc->enabled) 300 continue; 301 302 if (!fb) { 303 DRM_ERROR("no fb to restore??\n"); 304 continue; 305 } 306 307 drm_fb_helper_restore_lut_atomic(mode_set->crtc); 308 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, 309 crtc->y, LEAVE_ATOMIC_MODE_SET); 310 } 311 312 return 0; 313 } 314 EXPORT_SYMBOL(drm_fb_helper_debug_leave); 315 #endif 316 317 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper) 318 { 319 struct drm_device *dev = fb_helper->dev; 320 struct drm_plane *plane; 321 struct drm_atomic_state *state; 322 int i, ret; 323 unsigned plane_mask; 324 325 state = drm_atomic_state_alloc(dev); 326 if (!state) 327 return -ENOMEM; 328 329 state->acquire_ctx = dev->mode_config.acquire_ctx; 330 retry: 331 plane_mask = 0; 332 drm_for_each_plane(plane, dev) { 333 struct drm_plane_state *plane_state; 334 335 plane_state = drm_atomic_get_plane_state(state, plane); 336 if (IS_ERR(plane_state)) { 337 ret = PTR_ERR(plane_state); 338 goto fail; 339 } 340 341 plane_state->rotation = BIT(DRM_ROTATE_0); 342 343 plane->old_fb = plane->fb; 344 plane_mask |= 1 << drm_plane_index(plane); 345 346 /* disable non-primary: */ 347 if (plane->type == DRM_PLANE_TYPE_PRIMARY) 348 continue; 349 350 ret = __drm_atomic_helper_disable_plane(plane, plane_state); 351 if (ret != 0) 352 goto fail; 353 } 354 355 for(i = 0; i < fb_helper->crtc_count; i++) { 356 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 357 358 ret = __drm_atomic_helper_set_config(mode_set, state); 359 if (ret != 0) 360 goto fail; 361 } 362 363 ret = drm_atomic_commit(state); 364 365 fail: 366 drm_atomic_clean_old_fb(dev, plane_mask, ret); 367 368 if (ret == -EDEADLK) 369 goto backoff; 370 371 if (ret != 0) 372 drm_atomic_state_free(state); 373 374 return ret; 375 376 backoff: 377 drm_atomic_state_clear(state); 378 drm_atomic_legacy_backoff(state); 379 380 goto retry; 381 } 382 383 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper) 384 { 385 struct drm_device *dev = fb_helper->dev; 386 struct drm_plane *plane; 387 bool error = false; 388 int i; 389 390 drm_warn_on_modeset_not_all_locked(dev); 391 392 if (fb_helper->atomic) 393 return restore_fbdev_mode_atomic(fb_helper); 394 395 drm_for_each_plane(plane, dev) { 396 if (plane->type != DRM_PLANE_TYPE_PRIMARY) 397 drm_plane_force_disable(plane); 398 399 if (dev->mode_config.rotation_property) { 400 drm_mode_plane_set_obj_prop(plane, 401 dev->mode_config.rotation_property, 402 BIT(DRM_ROTATE_0)); 403 } 404 } 405 406 for (i = 0; i < fb_helper->crtc_count; i++) { 407 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 408 struct drm_crtc *crtc = mode_set->crtc; 409 int ret; 410 411 if (crtc->funcs->cursor_set) { 412 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0); 413 if (ret) 414 error = true; 415 } 416 417 ret = drm_mode_set_config_internal(mode_set); 418 if (ret) 419 error = true; 420 } 421 return error; 422 } 423 424 /** 425 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration 426 * @fb_helper: fbcon to restore 427 * 428 * This should be called from driver's drm ->lastclose callback 429 * when implementing an fbcon on top of kms using this helper. This ensures that 430 * the user isn't greeted with a black screen when e.g. X dies. 431 * 432 * RETURNS: 433 * Zero if everything went ok, negative error code otherwise. 434 */ 435 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) 436 { 437 struct drm_device *dev = fb_helper->dev; 438 bool do_delayed; 439 int ret; 440 441 if (!drm_fbdev_emulation) 442 return -ENODEV; 443 444 drm_modeset_lock_all(dev); 445 ret = restore_fbdev_mode(fb_helper); 446 447 do_delayed = fb_helper->delayed_hotplug; 448 if (do_delayed) 449 fb_helper->delayed_hotplug = false; 450 drm_modeset_unlock_all(dev); 451 452 if (do_delayed) 453 drm_fb_helper_hotplug_event(fb_helper); 454 return ret; 455 } 456 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked); 457 458 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper) 459 { 460 struct drm_device *dev = fb_helper->dev; 461 struct drm_crtc *crtc; 462 int bound = 0, crtcs_bound = 0; 463 464 /* Sometimes user space wants everything disabled, so don't steal the 465 * display if there's a master. */ 466 #if 0 467 if (dev->primary->master) 468 return false; 469 #endif 470 471 drm_for_each_crtc(crtc, dev) { 472 if (crtc->primary->fb) 473 crtcs_bound++; 474 if (crtc->primary->fb == fb_helper->fb) 475 bound++; 476 } 477 478 if (bound < crtcs_bound) 479 return false; 480 481 return true; 482 } 483 484 #ifdef CONFIG_MAGIC_SYSRQ 485 /* 486 * restore fbcon display for all kms driver's using this helper, used for sysrq 487 * and panic handling. 488 */ 489 static bool drm_fb_helper_force_kernel_mode(void) 490 { 491 bool ret, error = false; 492 struct drm_fb_helper *helper; 493 494 if (list_empty(&kernel_fb_helper_list)) 495 return false; 496 497 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 498 struct drm_device *dev = helper->dev; 499 500 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) 501 continue; 502 503 drm_modeset_lock_all(dev); 504 ret = restore_fbdev_mode(helper); 505 if (ret) 506 error = true; 507 drm_modeset_unlock_all(dev); 508 } 509 return error; 510 } 511 512 #if 0 513 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) 514 { 515 bool ret; 516 ret = drm_fb_helper_force_kernel_mode(); 517 if (ret == true) 518 DRM_ERROR("Failed to restore crtc configuration\n"); 519 } 520 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); 521 522 static void drm_fb_helper_sysrq(int dummy1) 523 { 524 schedule_work(&drm_fb_helper_restore_work); 525 } 526 527 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { 528 .handler = drm_fb_helper_sysrq, 529 .help_msg = "force-fb(V)", 530 .action_msg = "Restore framebuffer console", 531 }; 532 #else 533 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; 534 #endif 535 #endif 536 537 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) 538 { 539 struct drm_fb_helper *fb_helper = info->par; 540 struct drm_device *dev = fb_helper->dev; 541 struct drm_crtc *crtc; 542 struct drm_connector *connector; 543 int i, j; 544 545 /* 546 * For each CRTC in this fb, turn the connectors on/off. 547 */ 548 drm_modeset_lock_all(dev); 549 if (!drm_fb_helper_is_bound(fb_helper)) { 550 drm_modeset_unlock_all(dev); 551 return; 552 } 553 554 for (i = 0; i < fb_helper->crtc_count; i++) { 555 crtc = fb_helper->crtc_info[i].mode_set.crtc; 556 557 if (!crtc->enabled) 558 continue; 559 560 /* Walk the connectors & encoders on this fb turning them on/off */ 561 for (j = 0; j < fb_helper->connector_count; j++) { 562 connector = fb_helper->connector_info[j]->connector; 563 connector->funcs->dpms(connector, dpms_mode); 564 drm_object_property_set_value(&connector->base, 565 dev->mode_config.dpms_property, dpms_mode); 566 } 567 } 568 drm_modeset_unlock_all(dev); 569 } 570 571 /** 572 * drm_fb_helper_blank - implementation for ->fb_blank 573 * @blank: desired blanking state 574 * @info: fbdev registered by the helper 575 */ 576 int drm_fb_helper_blank(int blank, struct fb_info *info) 577 { 578 #ifdef __DragonFly__ 579 if (panicstr) 580 return -EBUSY; 581 #else 582 if (oops_in_progress) 583 return -EBUSY; 584 #endif 585 586 switch (blank) { 587 /* Display: On; HSync: On, VSync: On */ 588 case FB_BLANK_UNBLANK: 589 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); 590 break; 591 #if 0 592 /* Display: Off; HSync: On, VSync: On */ 593 case FB_BLANK_NORMAL: 594 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 595 break; 596 /* Display: Off; HSync: Off, VSync: On */ 597 case FB_BLANK_HSYNC_SUSPEND: 598 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 599 break; 600 /* Display: Off; HSync: On, VSync: Off */ 601 case FB_BLANK_VSYNC_SUSPEND: 602 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); 603 break; 604 #endif 605 /* Display: Off; HSync: Off, VSync: Off */ 606 case FB_BLANK_POWERDOWN: 607 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); 608 break; 609 } 610 return 0; 611 } 612 EXPORT_SYMBOL(drm_fb_helper_blank); 613 614 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) 615 { 616 int i; 617 618 for (i = 0; i < helper->connector_count; i++) { 619 drm_connector_unreference(helper->connector_info[i]->connector); 620 kfree(helper->connector_info[i]); 621 } 622 kfree(helper->connector_info); 623 for (i = 0; i < helper->crtc_count; i++) { 624 kfree(helper->crtc_info[i].mode_set.connectors); 625 if (helper->crtc_info[i].mode_set.mode) 626 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode); 627 } 628 kfree(helper->crtc_info); 629 } 630 631 static void drm_fb_helper_dirty_work(struct work_struct *work) 632 { 633 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, 634 dirty_work); 635 struct drm_clip_rect *clip = &helper->dirty_clip; 636 struct drm_clip_rect clip_copy; 637 unsigned long flags; 638 639 spin_lock_irqsave(&helper->dirty_lock, flags); 640 clip_copy = *clip; 641 clip->x1 = clip->y1 = ~0; 642 clip->x2 = clip->y2 = 0; 643 spin_unlock_irqrestore(&helper->dirty_lock, flags); 644 645 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); 646 } 647 648 /** 649 * drm_fb_helper_prepare - setup a drm_fb_helper structure 650 * @dev: DRM device 651 * @helper: driver-allocated fbdev helper structure to set up 652 * @funcs: pointer to structure of functions associate with this helper 653 * 654 * Sets up the bare minimum to make the framebuffer helper usable. This is 655 * useful to implement race-free initialization of the polling helpers. 656 */ 657 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, 658 const struct drm_fb_helper_funcs *funcs) 659 { 660 INIT_LIST_HEAD(&helper->kernel_fb_list); 661 lockinit(&helper->dirty_lock, "drm_fb_helper dirty_lock", 0, LK_CANRECURSE); 662 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); 663 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0; 664 helper->funcs = funcs; 665 helper->dev = dev; 666 } 667 EXPORT_SYMBOL(drm_fb_helper_prepare); 668 669 /** 670 * drm_fb_helper_init - initialize a drm_fb_helper structure 671 * @dev: drm device 672 * @fb_helper: driver-allocated fbdev helper structure to initialize 673 * @crtc_count: maximum number of crtcs to support in this fbdev emulation 674 * @max_conn_count: max connector count 675 * 676 * This allocates the structures for the fbdev helper with the given limits. 677 * Note that this won't yet touch the hardware (through the driver interfaces) 678 * nor register the fbdev. This is only done in drm_fb_helper_initial_config() 679 * to allow driver writes more control over the exact init sequence. 680 * 681 * Drivers must call drm_fb_helper_prepare() before calling this function. 682 * 683 * RETURNS: 684 * Zero if everything went ok, nonzero otherwise. 685 */ 686 int drm_fb_helper_init(struct drm_device *dev, 687 struct drm_fb_helper *fb_helper, 688 int crtc_count, int max_conn_count) 689 { 690 struct drm_crtc *crtc; 691 int i; 692 693 if (!drm_fbdev_emulation) 694 return 0; 695 696 if (!max_conn_count) 697 return -EINVAL; 698 699 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); 700 if (!fb_helper->crtc_info) 701 return -ENOMEM; 702 703 fb_helper->crtc_count = crtc_count; 704 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); 705 if (!fb_helper->connector_info) { 706 kfree(fb_helper->crtc_info); 707 return -ENOMEM; 708 } 709 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector; 710 fb_helper->connector_count = 0; 711 712 for (i = 0; i < crtc_count; i++) { 713 fb_helper->crtc_info[i].mode_set.connectors = 714 kcalloc(max_conn_count, 715 sizeof(struct drm_connector *), 716 GFP_KERNEL); 717 718 if (!fb_helper->crtc_info[i].mode_set.connectors) 719 goto out_free; 720 fb_helper->crtc_info[i].mode_set.num_connectors = 0; 721 } 722 723 i = 0; 724 drm_for_each_crtc(crtc, dev) { 725 fb_helper->crtc_info[i].mode_set.crtc = crtc; 726 i++; 727 } 728 729 fb_helper->atomic = !!drm_core_check_feature(dev, DRIVER_ATOMIC); 730 731 return 0; 732 out_free: 733 drm_fb_helper_crtc_free(fb_helper); 734 return -ENOMEM; 735 } 736 EXPORT_SYMBOL(drm_fb_helper_init); 737 738 /** 739 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members 740 * @fb_helper: driver-allocated fbdev helper 741 * 742 * A helper to alloc fb_info and the members cmap and apertures. Called 743 * by the driver within the fb_probe fb_helper callback function. 744 * 745 * RETURNS: 746 * fb_info pointer if things went okay, pointer containing error code 747 * otherwise 748 */ 749 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) 750 { 751 struct fb_info *info; 752 753 #ifdef __DragonFly__ 754 info = kzalloc(sizeof(struct fb_info), GFP_KERNEL); 755 #else 756 info = framebuffer_alloc(0, dev); 757 #endif 758 if (!info) 759 return ERR_PTR(-ENOMEM); 760 761 #if 0 762 ret = fb_alloc_cmap(&info->cmap, 256, 0); 763 if (ret) 764 goto err_release; 765 766 info->apertures = alloc_apertures(1); 767 if (!info->apertures) { 768 ret = -ENOMEM; 769 goto err_free_cmap; 770 } 771 #endif 772 773 fb_helper->fbdev = info; 774 775 return info; 776 777 #if 0 778 err_free_cmap: 779 fb_dealloc_cmap(&info->cmap); 780 err_release: 781 framebuffer_release(info); 782 return ERR_PTR(ret); 783 #endif 784 } 785 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi); 786 787 /** 788 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device 789 * @fb_helper: driver-allocated fbdev helper 790 * 791 * A wrapper around unregister_framebuffer, to release the fb_info 792 * framebuffer device 793 */ 794 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) 795 { 796 if (fb_helper && fb_helper->fbdev) 797 unregister_framebuffer(fb_helper->fbdev); 798 } 799 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi); 800 801 /** 802 * drm_fb_helper_release_fbi - dealloc fb_info and its members 803 * @fb_helper: driver-allocated fbdev helper 804 * 805 * A helper to free memory taken by fb_info and the members cmap and 806 * apertures 807 */ 808 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper) 809 { 810 if (fb_helper) { 811 struct fb_info *info = fb_helper->fbdev; 812 813 if (info) { 814 #ifdef __DragonFly__ 815 kfree(info); 816 #else 817 if (info->cmap.len) 818 fb_dealloc_cmap(&info->cmap); 819 framebuffer_release(info); 820 #endif 821 } 822 823 fb_helper->fbdev = NULL; 824 } 825 } 826 EXPORT_SYMBOL(drm_fb_helper_release_fbi); 827 828 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) 829 { 830 if (!drm_fbdev_emulation) 831 return; 832 833 if (!list_empty(&fb_helper->kernel_fb_list)) { 834 list_del(&fb_helper->kernel_fb_list); 835 if (list_empty(&kernel_fb_helper_list)) { 836 #if 0 837 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 838 #endif 839 } 840 } 841 842 drm_fb_helper_crtc_free(fb_helper); 843 844 } 845 EXPORT_SYMBOL(drm_fb_helper_fini); 846 847 #if 0 848 /** 849 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer 850 * @fb_helper: driver-allocated fbdev helper 851 * 852 * A wrapper around unlink_framebuffer implemented by fbdev core 853 */ 854 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) 855 { 856 if (fb_helper && fb_helper->fbdev) 857 unlink_framebuffer(fb_helper->fbdev); 858 } 859 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); 860 861 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, 862 u32 width, u32 height) 863 { 864 struct drm_fb_helper *helper = info->par; 865 struct drm_clip_rect *clip = &helper->dirty_clip; 866 unsigned long flags; 867 868 if (!helper->fb->funcs->dirty) 869 return; 870 871 spin_lock_irqsave(&helper->dirty_lock, flags); 872 clip->x1 = min_t(u32, clip->x1, x); 873 clip->y1 = min_t(u32, clip->y1, y); 874 clip->x2 = max_t(u32, clip->x2, x + width); 875 clip->y2 = max_t(u32, clip->y2, y + height); 876 spin_unlock_irqrestore(&helper->dirty_lock, flags); 877 878 schedule_work(&helper->dirty_work); 879 } 880 881 /** 882 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function 883 * @info: fb_info struct pointer 884 * @pagelist: list of dirty mmap framebuffer pages 885 * 886 * This function is used as the &fb_deferred_io ->deferred_io 887 * callback function for flushing the fbdev mmap writes. 888 */ 889 void drm_fb_helper_deferred_io(struct fb_info *info, 890 struct list_head *pagelist) 891 { 892 unsigned long start, end, min, max; 893 struct page *page; 894 u32 y1, y2; 895 896 min = ULONG_MAX; 897 max = 0; 898 list_for_each_entry(page, pagelist, lru) { 899 start = page->index << PAGE_SHIFT; 900 end = start + PAGE_SIZE - 1; 901 min = min(min, start); 902 max = max(max, end); 903 } 904 905 if (min < max) { 906 y1 = min / info->fix.line_length; 907 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length), 908 info->var.yres); 909 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); 910 } 911 } 912 EXPORT_SYMBOL(drm_fb_helper_deferred_io); 913 914 /** 915 * drm_fb_helper_sys_read - wrapper around fb_sys_read 916 * @info: fb_info struct pointer 917 * @buf: userspace buffer to read from framebuffer memory 918 * @count: number of bytes to read from framebuffer memory 919 * @ppos: read offset within framebuffer memory 920 * 921 * A wrapper around fb_sys_read implemented by fbdev core 922 */ 923 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, 924 size_t count, loff_t *ppos) 925 { 926 return fb_sys_read(info, buf, count, ppos); 927 } 928 EXPORT_SYMBOL(drm_fb_helper_sys_read); 929 930 /** 931 * drm_fb_helper_sys_write - wrapper around fb_sys_write 932 * @info: fb_info struct pointer 933 * @buf: userspace buffer to write to framebuffer memory 934 * @count: number of bytes to write to framebuffer memory 935 * @ppos: write offset within framebuffer memory 936 * 937 * A wrapper around fb_sys_write implemented by fbdev core 938 */ 939 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, 940 size_t count, loff_t *ppos) 941 { 942 ssize_t ret; 943 944 ret = fb_sys_write(info, buf, count, ppos); 945 if (ret > 0) 946 drm_fb_helper_dirty(info, 0, 0, info->var.xres, 947 info->var.yres); 948 949 return ret; 950 } 951 EXPORT_SYMBOL(drm_fb_helper_sys_write); 952 953 /** 954 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect 955 * @info: fbdev registered by the helper 956 * @rect: info about rectangle to fill 957 * 958 * A wrapper around sys_fillrect implemented by fbdev core 959 */ 960 void drm_fb_helper_sys_fillrect(struct fb_info *info, 961 const struct fb_fillrect *rect) 962 { 963 sys_fillrect(info, rect); 964 drm_fb_helper_dirty(info, rect->dx, rect->dy, 965 rect->width, rect->height); 966 } 967 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); 968 969 /** 970 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea 971 * @info: fbdev registered by the helper 972 * @area: info about area to copy 973 * 974 * A wrapper around sys_copyarea implemented by fbdev core 975 */ 976 void drm_fb_helper_sys_copyarea(struct fb_info *info, 977 const struct fb_copyarea *area) 978 { 979 sys_copyarea(info, area); 980 drm_fb_helper_dirty(info, area->dx, area->dy, 981 area->width, area->height); 982 } 983 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); 984 985 /** 986 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit 987 * @info: fbdev registered by the helper 988 * @image: info about image to blit 989 * 990 * A wrapper around sys_imageblit implemented by fbdev core 991 */ 992 void drm_fb_helper_sys_imageblit(struct fb_info *info, 993 const struct fb_image *image) 994 { 995 sys_imageblit(info, image); 996 drm_fb_helper_dirty(info, image->dx, image->dy, 997 image->width, image->height); 998 } 999 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); 1000 1001 /** 1002 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect 1003 * @info: fbdev registered by the helper 1004 * @rect: info about rectangle to fill 1005 * 1006 * A wrapper around cfb_imageblit implemented by fbdev core 1007 */ 1008 void drm_fb_helper_cfb_fillrect(struct fb_info *info, 1009 const struct fb_fillrect *rect) 1010 { 1011 cfb_fillrect(info, rect); 1012 drm_fb_helper_dirty(info, rect->dx, rect->dy, 1013 rect->width, rect->height); 1014 } 1015 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); 1016 1017 /** 1018 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea 1019 * @info: fbdev registered by the helper 1020 * @area: info about area to copy 1021 * 1022 * A wrapper around cfb_copyarea implemented by fbdev core 1023 */ 1024 void drm_fb_helper_cfb_copyarea(struct fb_info *info, 1025 const struct fb_copyarea *area) 1026 { 1027 cfb_copyarea(info, area); 1028 drm_fb_helper_dirty(info, area->dx, area->dy, 1029 area->width, area->height); 1030 } 1031 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); 1032 1033 /** 1034 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit 1035 * @info: fbdev registered by the helper 1036 * @image: info about image to blit 1037 * 1038 * A wrapper around cfb_imageblit implemented by fbdev core 1039 */ 1040 void drm_fb_helper_cfb_imageblit(struct fb_info *info, 1041 const struct fb_image *image) 1042 { 1043 cfb_imageblit(info, image); 1044 drm_fb_helper_dirty(info, image->dx, image->dy, 1045 image->width, image->height); 1046 } 1047 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); 1048 1049 /** 1050 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend 1051 * @fb_helper: driver-allocated fbdev helper 1052 * @state: desired state, zero to resume, non-zero to suspend 1053 * 1054 * A wrapper around fb_set_suspend implemented by fbdev core 1055 */ 1056 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state) 1057 { 1058 if (fb_helper && fb_helper->fbdev) 1059 fb_set_suspend(fb_helper->fbdev, state); 1060 } 1061 EXPORT_SYMBOL(drm_fb_helper_set_suspend); 1062 1063 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green, 1064 u16 blue, u16 regno, struct fb_info *info) 1065 { 1066 struct drm_fb_helper *fb_helper = info->par; 1067 struct drm_framebuffer *fb = fb_helper->fb; 1068 int pindex; 1069 1070 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 1071 u32 *palette; 1072 u32 value; 1073 /* place color in psuedopalette */ 1074 if (regno > 16) 1075 return -EINVAL; 1076 palette = (u32 *)info->pseudo_palette; 1077 red >>= (16 - info->var.red.length); 1078 green >>= (16 - info->var.green.length); 1079 blue >>= (16 - info->var.blue.length); 1080 value = (red << info->var.red.offset) | 1081 (green << info->var.green.offset) | 1082 (blue << info->var.blue.offset); 1083 if (info->var.transp.length > 0) { 1084 u32 mask = (1 << info->var.transp.length) - 1; 1085 mask <<= info->var.transp.offset; 1086 value |= mask; 1087 } 1088 palette[regno] = value; 1089 return 0; 1090 } 1091 1092 /* 1093 * The driver really shouldn't advertise pseudo/directcolor 1094 * visuals if it can't deal with the palette. 1095 */ 1096 if (WARN_ON(!fb_helper->funcs->gamma_set || 1097 !fb_helper->funcs->gamma_get)) 1098 return -EINVAL; 1099 1100 pindex = regno; 1101 1102 if (fb->bits_per_pixel == 16) { 1103 pindex = regno << 3; 1104 1105 if (fb->depth == 16 && regno > 63) 1106 return -EINVAL; 1107 if (fb->depth == 15 && regno > 31) 1108 return -EINVAL; 1109 1110 if (fb->depth == 16) { 1111 u16 r, g, b; 1112 int i; 1113 if (regno < 32) { 1114 for (i = 0; i < 8; i++) 1115 fb_helper->funcs->gamma_set(crtc, red, 1116 green, blue, pindex + i); 1117 } 1118 1119 fb_helper->funcs->gamma_get(crtc, &r, 1120 &g, &b, 1121 pindex >> 1); 1122 1123 for (i = 0; i < 4; i++) 1124 fb_helper->funcs->gamma_set(crtc, r, 1125 green, b, 1126 (pindex >> 1) + i); 1127 } 1128 } 1129 1130 if (fb->depth != 16) 1131 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex); 1132 return 0; 1133 } 1134 1135 /** 1136 * drm_fb_helper_setcmap - implementation for ->fb_setcmap 1137 * @cmap: cmap to set 1138 * @info: fbdev registered by the helper 1139 */ 1140 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) 1141 { 1142 struct drm_fb_helper *fb_helper = info->par; 1143 struct drm_device *dev = fb_helper->dev; 1144 const struct drm_crtc_helper_funcs *crtc_funcs; 1145 u16 *red, *green, *blue, *transp; 1146 struct drm_crtc *crtc; 1147 int i, j, rc = 0; 1148 int start; 1149 1150 if (oops_in_progress) 1151 return -EBUSY; 1152 1153 drm_modeset_lock_all(dev); 1154 if (!drm_fb_helper_is_bound(fb_helper)) { 1155 drm_modeset_unlock_all(dev); 1156 return -EBUSY; 1157 } 1158 1159 for (i = 0; i < fb_helper->crtc_count; i++) { 1160 crtc = fb_helper->crtc_info[i].mode_set.crtc; 1161 crtc_funcs = crtc->helper_private; 1162 1163 red = cmap->red; 1164 green = cmap->green; 1165 blue = cmap->blue; 1166 transp = cmap->transp; 1167 start = cmap->start; 1168 1169 for (j = 0; j < cmap->len; j++) { 1170 u16 hred, hgreen, hblue, htransp = 0xffff; 1171 1172 hred = *red++; 1173 hgreen = *green++; 1174 hblue = *blue++; 1175 1176 if (transp) 1177 htransp = *transp++; 1178 1179 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info); 1180 if (rc) 1181 goto out; 1182 } 1183 if (crtc_funcs->load_lut) 1184 crtc_funcs->load_lut(crtc); 1185 } 1186 out: 1187 drm_modeset_unlock_all(dev); 1188 return rc; 1189 } 1190 EXPORT_SYMBOL(drm_fb_helper_setcmap); 1191 1192 /** 1193 * drm_fb_helper_check_var - implementation for ->fb_check_var 1194 * @var: screeninfo to check 1195 * @info: fbdev registered by the helper 1196 */ 1197 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 1198 struct fb_info *info) 1199 { 1200 struct drm_fb_helper *fb_helper = info->par; 1201 struct drm_framebuffer *fb = fb_helper->fb; 1202 int depth; 1203 1204 if (var->pixclock != 0 || in_dbg_master()) 1205 return -EINVAL; 1206 1207 /* Need to resize the fb object !!! */ 1208 if (var->bits_per_pixel > fb->bits_per_pixel || 1209 var->xres > fb->width || var->yres > fb->height || 1210 var->xres_virtual > fb->width || var->yres_virtual > fb->height) { 1211 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb " 1212 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", 1213 var->xres, var->yres, var->bits_per_pixel, 1214 var->xres_virtual, var->yres_virtual, 1215 fb->width, fb->height, fb->bits_per_pixel); 1216 return -EINVAL; 1217 } 1218 1219 switch (var->bits_per_pixel) { 1220 case 16: 1221 depth = (var->green.length == 6) ? 16 : 15; 1222 break; 1223 case 32: 1224 depth = (var->transp.length > 0) ? 32 : 24; 1225 break; 1226 default: 1227 depth = var->bits_per_pixel; 1228 break; 1229 } 1230 1231 switch (depth) { 1232 case 8: 1233 var->red.offset = 0; 1234 var->green.offset = 0; 1235 var->blue.offset = 0; 1236 var->red.length = 8; 1237 var->green.length = 8; 1238 var->blue.length = 8; 1239 var->transp.length = 0; 1240 var->transp.offset = 0; 1241 break; 1242 case 15: 1243 var->red.offset = 10; 1244 var->green.offset = 5; 1245 var->blue.offset = 0; 1246 var->red.length = 5; 1247 var->green.length = 5; 1248 var->blue.length = 5; 1249 var->transp.length = 1; 1250 var->transp.offset = 15; 1251 break; 1252 case 16: 1253 var->red.offset = 11; 1254 var->green.offset = 5; 1255 var->blue.offset = 0; 1256 var->red.length = 5; 1257 var->green.length = 6; 1258 var->blue.length = 5; 1259 var->transp.length = 0; 1260 var->transp.offset = 0; 1261 break; 1262 case 24: 1263 var->red.offset = 16; 1264 var->green.offset = 8; 1265 var->blue.offset = 0; 1266 var->red.length = 8; 1267 var->green.length = 8; 1268 var->blue.length = 8; 1269 var->transp.length = 0; 1270 var->transp.offset = 0; 1271 break; 1272 case 32: 1273 var->red.offset = 16; 1274 var->green.offset = 8; 1275 var->blue.offset = 0; 1276 var->red.length = 8; 1277 var->green.length = 8; 1278 var->blue.length = 8; 1279 var->transp.length = 8; 1280 var->transp.offset = 24; 1281 break; 1282 default: 1283 return -EINVAL; 1284 } 1285 return 0; 1286 } 1287 EXPORT_SYMBOL(drm_fb_helper_check_var); 1288 #endif 1289 1290 /** 1291 * drm_fb_helper_set_par - implementation for ->fb_set_par 1292 * @info: fbdev registered by the helper 1293 * 1294 * This will let fbcon do the mode init and is called at initialization time by 1295 * the fbdev core when registering the driver, and later on through the hotplug 1296 * callback. 1297 */ 1298 int drm_fb_helper_set_par(struct fb_info *info) 1299 { 1300 struct drm_fb_helper *fb_helper = info->par; 1301 #if 0 1302 struct fb_var_screeninfo *var = &info->var; 1303 #endif 1304 1305 #ifdef __DragonFly__ 1306 if (panicstr) 1307 return -EBUSY; 1308 #else 1309 if (oops_in_progress) 1310 return -EBUSY; 1311 #endif 1312 1313 #if 0 1314 if (var->pixclock != 0) { 1315 DRM_ERROR("PIXEL CLOCK SET\n"); 1316 return -EINVAL; 1317 } 1318 #endif 1319 1320 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); 1321 1322 return 0; 1323 } 1324 EXPORT_SYMBOL(drm_fb_helper_set_par); 1325 1326 #if 0 1327 static int pan_display_atomic(struct fb_var_screeninfo *var, 1328 struct fb_info *info) 1329 { 1330 struct drm_fb_helper *fb_helper = info->par; 1331 struct drm_device *dev = fb_helper->dev; 1332 struct drm_atomic_state *state; 1333 struct drm_plane *plane; 1334 int i, ret; 1335 unsigned plane_mask; 1336 1337 state = drm_atomic_state_alloc(dev); 1338 if (!state) 1339 return -ENOMEM; 1340 1341 state->acquire_ctx = dev->mode_config.acquire_ctx; 1342 retry: 1343 plane_mask = 0; 1344 for(i = 0; i < fb_helper->crtc_count; i++) { 1345 struct drm_mode_set *mode_set; 1346 1347 mode_set = &fb_helper->crtc_info[i].mode_set; 1348 1349 mode_set->x = var->xoffset; 1350 mode_set->y = var->yoffset; 1351 1352 ret = __drm_atomic_helper_set_config(mode_set, state); 1353 if (ret != 0) 1354 goto fail; 1355 1356 plane = mode_set->crtc->primary; 1357 plane_mask |= (1 << drm_plane_index(plane)); 1358 plane->old_fb = plane->fb; 1359 } 1360 1361 ret = drm_atomic_commit(state); 1362 if (ret != 0) 1363 goto fail; 1364 1365 info->var.xoffset = var->xoffset; 1366 info->var.yoffset = var->yoffset; 1367 1368 1369 fail: 1370 drm_atomic_clean_old_fb(dev, plane_mask, ret); 1371 1372 if (ret == -EDEADLK) 1373 goto backoff; 1374 1375 if (ret != 0) 1376 drm_atomic_state_free(state); 1377 1378 return ret; 1379 1380 backoff: 1381 drm_atomic_state_clear(state); 1382 drm_atomic_legacy_backoff(state); 1383 1384 goto retry; 1385 } 1386 1387 /** 1388 * drm_fb_helper_pan_display - implementation for ->fb_pan_display 1389 * @var: updated screen information 1390 * @info: fbdev registered by the helper 1391 */ 1392 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 1393 struct fb_info *info) 1394 { 1395 struct drm_fb_helper *fb_helper = info->par; 1396 struct drm_device *dev = fb_helper->dev; 1397 struct drm_mode_set *modeset; 1398 int ret = 0; 1399 int i; 1400 1401 if (oops_in_progress) 1402 return -EBUSY; 1403 1404 drm_modeset_lock_all(dev); 1405 if (!drm_fb_helper_is_bound(fb_helper)) { 1406 drm_modeset_unlock_all(dev); 1407 return -EBUSY; 1408 } 1409 1410 if (fb_helper->atomic) { 1411 ret = pan_display_atomic(var, info); 1412 goto unlock; 1413 } 1414 1415 for (i = 0; i < fb_helper->crtc_count; i++) { 1416 modeset = &fb_helper->crtc_info[i].mode_set; 1417 1418 modeset->x = var->xoffset; 1419 modeset->y = var->yoffset; 1420 1421 if (modeset->num_connectors) { 1422 ret = drm_mode_set_config_internal(modeset); 1423 if (!ret) { 1424 info->var.xoffset = var->xoffset; 1425 info->var.yoffset = var->yoffset; 1426 } 1427 } 1428 } 1429 unlock: 1430 drm_modeset_unlock_all(dev); 1431 return ret; 1432 } 1433 EXPORT_SYMBOL(drm_fb_helper_pan_display); 1434 #endif 1435 1436 /* 1437 * Allocates the backing storage and sets up the fbdev info structure through 1438 * the ->fb_probe callback and then registers the fbdev and sets up the panic 1439 * notifier. 1440 */ 1441 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, 1442 int preferred_bpp) 1443 { 1444 int ret = 0; 1445 int crtc_count = 0; 1446 int i; 1447 struct fb_info *info; 1448 struct drm_fb_helper_surface_size sizes; 1449 int gamma_size = 0; 1450 #ifdef __DragonFly__ 1451 int kms_console = 1; 1452 #endif 1453 1454 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); 1455 sizes.surface_depth = 24; 1456 sizes.surface_bpp = 32; 1457 sizes.fb_width = (unsigned)-1; 1458 sizes.fb_height = (unsigned)-1; 1459 1460 /* if driver picks 8 or 16 by default use that 1461 for both depth/bpp */ 1462 if (preferred_bpp != sizes.surface_bpp) 1463 sizes.surface_depth = sizes.surface_bpp = preferred_bpp; 1464 1465 /* first up get a count of crtcs now in use and new min/maxes width/heights */ 1466 for (i = 0; i < fb_helper->connector_count; i++) { 1467 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; 1468 struct drm_cmdline_mode *cmdline_mode; 1469 1470 cmdline_mode = &fb_helper_conn->connector->cmdline_mode; 1471 1472 if (cmdline_mode->bpp_specified) { 1473 switch (cmdline_mode->bpp) { 1474 case 8: 1475 sizes.surface_depth = sizes.surface_bpp = 8; 1476 break; 1477 case 15: 1478 sizes.surface_depth = 15; 1479 sizes.surface_bpp = 16; 1480 break; 1481 case 16: 1482 sizes.surface_depth = sizes.surface_bpp = 16; 1483 break; 1484 case 24: 1485 sizes.surface_depth = sizes.surface_bpp = 24; 1486 break; 1487 case 32: 1488 sizes.surface_depth = 24; 1489 sizes.surface_bpp = 32; 1490 break; 1491 } 1492 break; 1493 } 1494 } 1495 1496 crtc_count = 0; 1497 for (i = 0; i < fb_helper->crtc_count; i++) { 1498 struct drm_display_mode *desired_mode; 1499 struct drm_mode_set *mode_set; 1500 int x, y, j; 1501 /* in case of tile group, are we the last tile vert or horiz? 1502 * If no tile group you are always the last one both vertically 1503 * and horizontally 1504 */ 1505 bool lastv = true, lasth = true; 1506 1507 desired_mode = fb_helper->crtc_info[i].desired_mode; 1508 mode_set = &fb_helper->crtc_info[i].mode_set; 1509 1510 if (!desired_mode) 1511 continue; 1512 1513 crtc_count++; 1514 1515 x = fb_helper->crtc_info[i].x; 1516 y = fb_helper->crtc_info[i].y; 1517 1518 if (gamma_size == 0) 1519 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; 1520 1521 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width); 1522 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height); 1523 1524 for (j = 0; j < mode_set->num_connectors; j++) { 1525 struct drm_connector *connector = mode_set->connectors[j]; 1526 if (connector->has_tile) { 1527 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1)); 1528 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1)); 1529 /* cloning to multiple tiles is just crazy-talk, so: */ 1530 break; 1531 } 1532 } 1533 1534 if (lasth) 1535 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width); 1536 if (lastv) 1537 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height); 1538 } 1539 1540 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { 1541 /* hmm everyone went away - assume VGA cable just fell out 1542 and will come back later. */ 1543 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n"); 1544 sizes.fb_width = sizes.surface_width = 1024; 1545 sizes.fb_height = sizes.surface_height = 768; 1546 } 1547 1548 /* push down into drivers */ 1549 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); 1550 if (ret < 0) 1551 return ret; 1552 1553 info = fb_helper->fbdev; 1554 1555 /* 1556 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug 1557 * events, but at init time drm_setup_crtcs needs to be called before 1558 * the fb is allocated (since we need to figure out the desired size of 1559 * the fb before we can allocate it ...). Hence we need to fix things up 1560 * here again. 1561 */ 1562 for (i = 0; i < fb_helper->crtc_count; i++) 1563 if (fb_helper->crtc_info[i].mode_set.num_connectors) 1564 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; 1565 1566 #ifdef __DragonFly__ 1567 TUNABLE_INT_FETCH("kern.kms_console", &kms_console); 1568 if (kms_console) { 1569 if (register_framebuffer(info) < 0) 1570 return -EINVAL; 1571 1572 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 1573 } 1574 #else 1575 info->var.pixclock = 0; 1576 if (register_framebuffer(info) < 0) 1577 return -EINVAL; 1578 1579 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n", 1580 info->node, info->fix.id); 1581 1582 if (list_empty(&kernel_fb_helper_list)) { 1583 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 1584 } 1585 1586 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 1587 #endif 1588 1589 return 0; 1590 } 1591 1592 #if 0 1593 /** 1594 * drm_fb_helper_fill_fix - initializes fixed fbdev information 1595 * @info: fbdev registered by the helper 1596 * @pitch: desired pitch 1597 * @depth: desired depth 1598 * 1599 * Helper to fill in the fixed fbdev information useful for a non-accelerated 1600 * fbdev emulations. Drivers which support acceleration methods which impose 1601 * additional constraints need to set up their own limits. 1602 * 1603 * Drivers should call this (or their equivalent setup code) from their 1604 * ->fb_probe callback. 1605 */ 1606 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 1607 uint32_t depth) 1608 { 1609 info->fix.type = FB_TYPE_PACKED_PIXELS; 1610 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : 1611 FB_VISUAL_TRUECOLOR; 1612 info->fix.mmio_start = 0; 1613 info->fix.mmio_len = 0; 1614 info->fix.type_aux = 0; 1615 info->fix.xpanstep = 1; /* doing it in hw */ 1616 info->fix.ypanstep = 1; /* doing it in hw */ 1617 info->fix.ywrapstep = 0; 1618 info->fix.accel = FB_ACCEL_NONE; 1619 1620 info->fix.line_length = pitch; 1621 return; 1622 } 1623 EXPORT_SYMBOL(drm_fb_helper_fill_fix); 1624 1625 /** 1626 * drm_fb_helper_fill_var - initalizes variable fbdev information 1627 * @info: fbdev instance to set up 1628 * @fb_helper: fb helper instance to use as template 1629 * @fb_width: desired fb width 1630 * @fb_height: desired fb height 1631 * 1632 * Sets up the variable fbdev metainformation from the given fb helper instance 1633 * and the drm framebuffer allocated in fb_helper->fb. 1634 * 1635 * Drivers should call this (or their equivalent setup code) from their 1636 * ->fb_probe callback after having allocated the fbdev backing 1637 * storage framebuffer. 1638 */ 1639 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 1640 uint32_t fb_width, uint32_t fb_height) 1641 { 1642 struct drm_framebuffer *fb = fb_helper->fb; 1643 info->pseudo_palette = fb_helper->pseudo_palette; 1644 info->var.xres_virtual = fb->width; 1645 info->var.yres_virtual = fb->height; 1646 info->var.bits_per_pixel = fb->bits_per_pixel; 1647 info->var.accel_flags = FB_ACCELF_TEXT; 1648 info->var.xoffset = 0; 1649 info->var.yoffset = 0; 1650 info->var.activate = FB_ACTIVATE_NOW; 1651 info->var.height = -1; 1652 info->var.width = -1; 1653 1654 switch (fb->depth) { 1655 case 8: 1656 info->var.red.offset = 0; 1657 info->var.green.offset = 0; 1658 info->var.blue.offset = 0; 1659 info->var.red.length = 8; /* 8bit DAC */ 1660 info->var.green.length = 8; 1661 info->var.blue.length = 8; 1662 info->var.transp.offset = 0; 1663 info->var.transp.length = 0; 1664 break; 1665 case 15: 1666 info->var.red.offset = 10; 1667 info->var.green.offset = 5; 1668 info->var.blue.offset = 0; 1669 info->var.red.length = 5; 1670 info->var.green.length = 5; 1671 info->var.blue.length = 5; 1672 info->var.transp.offset = 15; 1673 info->var.transp.length = 1; 1674 break; 1675 case 16: 1676 info->var.red.offset = 11; 1677 info->var.green.offset = 5; 1678 info->var.blue.offset = 0; 1679 info->var.red.length = 5; 1680 info->var.green.length = 6; 1681 info->var.blue.length = 5; 1682 info->var.transp.offset = 0; 1683 break; 1684 case 24: 1685 info->var.red.offset = 16; 1686 info->var.green.offset = 8; 1687 info->var.blue.offset = 0; 1688 info->var.red.length = 8; 1689 info->var.green.length = 8; 1690 info->var.blue.length = 8; 1691 info->var.transp.offset = 0; 1692 info->var.transp.length = 0; 1693 break; 1694 case 32: 1695 info->var.red.offset = 16; 1696 info->var.green.offset = 8; 1697 info->var.blue.offset = 0; 1698 info->var.red.length = 8; 1699 info->var.green.length = 8; 1700 info->var.blue.length = 8; 1701 info->var.transp.offset = 24; 1702 info->var.transp.length = 8; 1703 break; 1704 default: 1705 break; 1706 } 1707 1708 info->var.xres = fb_width; 1709 info->var.yres = fb_height; 1710 } 1711 EXPORT_SYMBOL(drm_fb_helper_fill_var); 1712 #endif 1713 1714 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, 1715 uint32_t maxX, 1716 uint32_t maxY) 1717 { 1718 struct drm_connector *connector; 1719 int count = 0; 1720 int i; 1721 1722 for (i = 0; i < fb_helper->connector_count; i++) { 1723 connector = fb_helper->connector_info[i]->connector; 1724 count += connector->funcs->fill_modes(connector, maxX, maxY); 1725 } 1726 1727 return count; 1728 } 1729 1730 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) 1731 { 1732 struct drm_display_mode *mode; 1733 1734 list_for_each_entry(mode, &fb_connector->connector->modes, head) { 1735 if (mode->hdisplay > width || 1736 mode->vdisplay > height) 1737 continue; 1738 if (mode->type & DRM_MODE_TYPE_PREFERRED) 1739 return mode; 1740 } 1741 return NULL; 1742 } 1743 EXPORT_SYMBOL(drm_has_preferred_mode); 1744 1745 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) 1746 { 1747 return fb_connector->connector->cmdline_mode.specified; 1748 } 1749 1750 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 1751 int width, int height) 1752 { 1753 struct drm_cmdline_mode *cmdline_mode; 1754 struct drm_display_mode *mode; 1755 bool prefer_non_interlace; 1756 1757 cmdline_mode = &fb_helper_conn->connector->cmdline_mode; 1758 if (cmdline_mode->specified == false) 1759 return NULL; 1760 1761 /* attempt to find a matching mode in the list of modes 1762 * we have gotten so far, if not add a CVT mode that conforms 1763 */ 1764 if (cmdline_mode->rb || cmdline_mode->margins) 1765 goto create_mode; 1766 1767 prefer_non_interlace = !cmdline_mode->interlace; 1768 again: 1769 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1770 /* check width/height */ 1771 if (mode->hdisplay != cmdline_mode->xres || 1772 mode->vdisplay != cmdline_mode->yres) 1773 continue; 1774 1775 if (cmdline_mode->refresh_specified) { 1776 if (mode->vrefresh != cmdline_mode->refresh) 1777 continue; 1778 } 1779 1780 if (cmdline_mode->interlace) { 1781 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) 1782 continue; 1783 } else if (prefer_non_interlace) { 1784 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 1785 continue; 1786 } 1787 return mode; 1788 } 1789 1790 if (prefer_non_interlace) { 1791 prefer_non_interlace = false; 1792 goto again; 1793 } 1794 1795 create_mode: 1796 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, 1797 cmdline_mode); 1798 list_add(&mode->head, &fb_helper_conn->connector->modes); 1799 return mode; 1800 } 1801 EXPORT_SYMBOL(drm_pick_cmdline_mode); 1802 1803 static bool drm_connector_enabled(struct drm_connector *connector, bool strict) 1804 { 1805 bool enable; 1806 1807 if (strict) 1808 enable = connector->status == connector_status_connected; 1809 else 1810 enable = connector->status != connector_status_disconnected; 1811 1812 return enable; 1813 } 1814 1815 static void drm_enable_connectors(struct drm_fb_helper *fb_helper, 1816 bool *enabled) 1817 { 1818 bool any_enabled = false; 1819 struct drm_connector *connector; 1820 int i = 0; 1821 1822 for (i = 0; i < fb_helper->connector_count; i++) { 1823 connector = fb_helper->connector_info[i]->connector; 1824 enabled[i] = drm_connector_enabled(connector, true); 1825 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, 1826 enabled[i] ? "yes" : "no"); 1827 any_enabled |= enabled[i]; 1828 } 1829 1830 if (any_enabled) 1831 return; 1832 1833 for (i = 0; i < fb_helper->connector_count; i++) { 1834 connector = fb_helper->connector_info[i]->connector; 1835 enabled[i] = drm_connector_enabled(connector, false); 1836 } 1837 } 1838 1839 static bool drm_target_cloned(struct drm_fb_helper *fb_helper, 1840 struct drm_display_mode **modes, 1841 struct drm_fb_offset *offsets, 1842 bool *enabled, int width, int height) 1843 { 1844 int count, i, j; 1845 bool can_clone = false; 1846 struct drm_fb_helper_connector *fb_helper_conn; 1847 struct drm_display_mode *dmt_mode, *mode; 1848 1849 /* only contemplate cloning in the single crtc case */ 1850 if (fb_helper->crtc_count > 1) 1851 return false; 1852 1853 count = 0; 1854 for (i = 0; i < fb_helper->connector_count; i++) { 1855 if (enabled[i]) 1856 count++; 1857 } 1858 1859 /* only contemplate cloning if more than one connector is enabled */ 1860 if (count <= 1) 1861 return false; 1862 1863 /* check the command line or if nothing common pick 1024x768 */ 1864 can_clone = true; 1865 for (i = 0; i < fb_helper->connector_count; i++) { 1866 if (!enabled[i]) 1867 continue; 1868 fb_helper_conn = fb_helper->connector_info[i]; 1869 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1870 if (!modes[i]) { 1871 can_clone = false; 1872 break; 1873 } 1874 for (j = 0; j < i; j++) { 1875 if (!enabled[j]) 1876 continue; 1877 if (!drm_mode_equal(modes[j], modes[i])) 1878 can_clone = false; 1879 } 1880 } 1881 1882 if (can_clone) { 1883 DRM_DEBUG_KMS("can clone using command line\n"); 1884 return true; 1885 } 1886 1887 /* try and find a 1024x768 mode on each connector */ 1888 can_clone = true; 1889 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false); 1890 1891 for (i = 0; i < fb_helper->connector_count; i++) { 1892 1893 if (!enabled[i]) 1894 continue; 1895 1896 fb_helper_conn = fb_helper->connector_info[i]; 1897 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1898 if (drm_mode_equal(mode, dmt_mode)) 1899 modes[i] = mode; 1900 } 1901 if (!modes[i]) 1902 can_clone = false; 1903 } 1904 1905 if (can_clone) { 1906 DRM_DEBUG_KMS("can clone using 1024x768\n"); 1907 return true; 1908 } 1909 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); 1910 return false; 1911 } 1912 1913 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper, 1914 struct drm_display_mode **modes, 1915 struct drm_fb_offset *offsets, 1916 int idx, 1917 int h_idx, int v_idx) 1918 { 1919 struct drm_fb_helper_connector *fb_helper_conn; 1920 int i; 1921 int hoffset = 0, voffset = 0; 1922 1923 for (i = 0; i < fb_helper->connector_count; i++) { 1924 fb_helper_conn = fb_helper->connector_info[i]; 1925 if (!fb_helper_conn->connector->has_tile) 1926 continue; 1927 1928 if (!modes[i] && (h_idx || v_idx)) { 1929 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i, 1930 fb_helper_conn->connector->base.id); 1931 continue; 1932 } 1933 if (fb_helper_conn->connector->tile_h_loc < h_idx) 1934 hoffset += modes[i]->hdisplay; 1935 1936 if (fb_helper_conn->connector->tile_v_loc < v_idx) 1937 voffset += modes[i]->vdisplay; 1938 } 1939 offsets[idx].x = hoffset; 1940 offsets[idx].y = voffset; 1941 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx); 1942 return 0; 1943 } 1944 1945 static bool drm_target_preferred(struct drm_fb_helper *fb_helper, 1946 struct drm_display_mode **modes, 1947 struct drm_fb_offset *offsets, 1948 bool *enabled, int width, int height) 1949 { 1950 struct drm_fb_helper_connector *fb_helper_conn; 1951 int i; 1952 uint64_t conn_configured = 0, mask; 1953 int tile_pass = 0; 1954 mask = (1 << fb_helper->connector_count) - 1; 1955 retry: 1956 for (i = 0; i < fb_helper->connector_count; i++) { 1957 fb_helper_conn = fb_helper->connector_info[i]; 1958 1959 if (conn_configured & (1 << i)) 1960 continue; 1961 1962 if (enabled[i] == false) { 1963 conn_configured |= (1 << i); 1964 continue; 1965 } 1966 1967 /* first pass over all the untiled connectors */ 1968 if (tile_pass == 0 && fb_helper_conn->connector->has_tile) 1969 continue; 1970 1971 if (tile_pass == 1) { 1972 if (fb_helper_conn->connector->tile_h_loc != 0 || 1973 fb_helper_conn->connector->tile_v_loc != 0) 1974 continue; 1975 1976 } else { 1977 if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 && 1978 fb_helper_conn->connector->tile_v_loc != tile_pass - 1) 1979 /* if this tile_pass doesn't cover any of the tiles - keep going */ 1980 continue; 1981 1982 /* find the tile offsets for this pass - need 1983 to find all tiles left and above */ 1984 drm_get_tile_offsets(fb_helper, modes, offsets, 1985 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc); 1986 } 1987 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", 1988 fb_helper_conn->connector->base.id); 1989 1990 /* got for command line mode first */ 1991 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1992 if (!modes[i]) { 1993 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n", 1994 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0); 1995 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); 1996 } 1997 /* No preferred modes, pick one off the list */ 1998 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { 1999 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) 2000 break; 2001 } 2002 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : 2003 "none"); 2004 conn_configured |= (1 << i); 2005 } 2006 2007 if ((conn_configured & mask) != mask) { 2008 tile_pass++; 2009 goto retry; 2010 } 2011 return true; 2012 } 2013 2014 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, 2015 struct drm_fb_helper_crtc **best_crtcs, 2016 struct drm_display_mode **modes, 2017 int n, int width, int height) 2018 { 2019 int c, o; 2020 struct drm_connector *connector; 2021 const struct drm_connector_helper_funcs *connector_funcs; 2022 struct drm_encoder *encoder; 2023 int my_score, best_score, score; 2024 struct drm_fb_helper_crtc **crtcs, *crtc; 2025 struct drm_fb_helper_connector *fb_helper_conn; 2026 2027 if (n == fb_helper->connector_count) 2028 return 0; 2029 2030 fb_helper_conn = fb_helper->connector_info[n]; 2031 connector = fb_helper_conn->connector; 2032 2033 best_crtcs[n] = NULL; 2034 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); 2035 if (modes[n] == NULL) 2036 return best_score; 2037 2038 crtcs = kzalloc(fb_helper->connector_count * 2039 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 2040 if (!crtcs) 2041 return best_score; 2042 2043 my_score = 1; 2044 if (connector->status == connector_status_connected) 2045 my_score++; 2046 if (drm_has_cmdline_mode(fb_helper_conn)) 2047 my_score++; 2048 if (drm_has_preferred_mode(fb_helper_conn, width, height)) 2049 my_score++; 2050 2051 connector_funcs = connector->helper_private; 2052 encoder = connector_funcs->best_encoder(connector); 2053 if (!encoder) 2054 goto out; 2055 2056 /* select a crtc for this connector and then attempt to configure 2057 remaining connectors */ 2058 for (c = 0; c < fb_helper->crtc_count; c++) { 2059 crtc = &fb_helper->crtc_info[c]; 2060 2061 if ((encoder->possible_crtcs & (1 << c)) == 0) 2062 continue; 2063 2064 for (o = 0; o < n; o++) 2065 if (best_crtcs[o] == crtc) 2066 break; 2067 2068 if (o < n) { 2069 /* ignore cloning unless only a single crtc */ 2070 if (fb_helper->crtc_count > 1) 2071 continue; 2072 2073 if (!drm_mode_equal(modes[o], modes[n])) 2074 continue; 2075 } 2076 2077 crtcs[n] = crtc; 2078 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); 2079 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, 2080 width, height); 2081 if (score > best_score) { 2082 best_score = score; 2083 memcpy(best_crtcs, crtcs, 2084 fb_helper->connector_count * 2085 sizeof(struct drm_fb_helper_crtc *)); 2086 } 2087 } 2088 out: 2089 kfree(crtcs); 2090 return best_score; 2091 } 2092 2093 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) 2094 { 2095 struct drm_device *dev = fb_helper->dev; 2096 struct drm_fb_helper_crtc **crtcs; 2097 struct drm_display_mode **modes; 2098 struct drm_fb_offset *offsets; 2099 struct drm_mode_set *modeset; 2100 bool *enabled; 2101 int width, height; 2102 int i; 2103 2104 DRM_DEBUG_KMS("\n"); 2105 2106 width = dev->mode_config.max_width; 2107 height = dev->mode_config.max_height; 2108 2109 crtcs = kcalloc(fb_helper->connector_count, 2110 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 2111 modes = kcalloc(fb_helper->connector_count, 2112 sizeof(struct drm_display_mode *), GFP_KERNEL); 2113 offsets = kcalloc(fb_helper->connector_count, 2114 sizeof(struct drm_fb_offset), GFP_KERNEL); 2115 enabled = kcalloc(fb_helper->connector_count, 2116 sizeof(bool), GFP_KERNEL); 2117 if (!crtcs || !modes || !enabled || !offsets) { 2118 DRM_ERROR("Memory allocation failed\n"); 2119 goto out; 2120 } 2121 2122 2123 drm_enable_connectors(fb_helper, enabled); 2124 2125 if (!(fb_helper->funcs->initial_config && 2126 fb_helper->funcs->initial_config(fb_helper, crtcs, modes, 2127 offsets, 2128 enabled, width, height))) { 2129 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0])); 2130 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0])); 2131 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0])); 2132 2133 if (!drm_target_cloned(fb_helper, modes, offsets, 2134 enabled, width, height) && 2135 !drm_target_preferred(fb_helper, modes, offsets, 2136 enabled, width, height)) 2137 DRM_ERROR("Unable to find initial modes\n"); 2138 2139 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", 2140 width, height); 2141 2142 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); 2143 } 2144 2145 /* need to set the modesets up here for use later */ 2146 /* fill out the connector<->crtc mappings into the modesets */ 2147 for (i = 0; i < fb_helper->crtc_count; i++) { 2148 modeset = &fb_helper->crtc_info[i].mode_set; 2149 modeset->num_connectors = 0; 2150 modeset->fb = NULL; 2151 } 2152 2153 for (i = 0; i < fb_helper->connector_count; i++) { 2154 struct drm_display_mode *mode = modes[i]; 2155 struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; 2156 struct drm_fb_offset *offset = &offsets[i]; 2157 modeset = &fb_crtc->mode_set; 2158 2159 if (mode && fb_crtc) { 2160 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n", 2161 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y); 2162 fb_crtc->desired_mode = mode; 2163 fb_crtc->x = offset->x; 2164 fb_crtc->y = offset->y; 2165 if (modeset->mode) 2166 drm_mode_destroy(dev, modeset->mode); 2167 modeset->mode = drm_mode_duplicate(dev, 2168 fb_crtc->desired_mode); 2169 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector; 2170 modeset->fb = fb_helper->fb; 2171 modeset->x = offset->x; 2172 modeset->y = offset->y; 2173 } 2174 } 2175 2176 /* Clear out any old modes if there are no more connected outputs. */ 2177 for (i = 0; i < fb_helper->crtc_count; i++) { 2178 modeset = &fb_helper->crtc_info[i].mode_set; 2179 if (modeset->num_connectors == 0) { 2180 BUG_ON(modeset->fb); 2181 if (modeset->mode) 2182 drm_mode_destroy(dev, modeset->mode); 2183 modeset->mode = NULL; 2184 } 2185 } 2186 out: 2187 kfree(crtcs); 2188 kfree(modes); 2189 kfree(offsets); 2190 kfree(enabled); 2191 } 2192 2193 /** 2194 * drm_fb_helper_initial_config - setup a sane initial connector configuration 2195 * @fb_helper: fb_helper device struct 2196 * @bpp_sel: bpp value to use for the framebuffer configuration 2197 * 2198 * Scans the CRTCs and connectors and tries to put together an initial setup. 2199 * At the moment, this is a cloned configuration across all heads with 2200 * a new framebuffer object as the backing store. 2201 * 2202 * Note that this also registers the fbdev and so allows userspace to call into 2203 * the driver through the fbdev interfaces. 2204 * 2205 * This function will call down into the ->fb_probe callback to let 2206 * the driver allocate and initialize the fbdev info structure and the drm 2207 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and 2208 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default 2209 * values for the fbdev info structure. 2210 * 2211 * HANG DEBUGGING: 2212 * 2213 * When you have fbcon support built-in or already loaded, this function will do 2214 * a full modeset to setup the fbdev console. Due to locking misdesign in the 2215 * VT/fbdev subsystem that entire modeset sequence has to be done while holding 2216 * console_lock. Until console_unlock is called no dmesg lines will be sent out 2217 * to consoles, not even serial console. This means when your driver crashes, 2218 * you will see absolutely nothing else but a system stuck in this function, 2219 * with no further output. Any kind of printk() you place within your own driver 2220 * or in the drm core modeset code will also never show up. 2221 * 2222 * Standard debug practice is to run the fbcon setup without taking the 2223 * console_lock as a hack, to be able to see backtraces and crashes on the 2224 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel 2225 * cmdline option. 2226 * 2227 * The other option is to just disable fbdev emulation since very likely the 2228 * first modeset from userspace will crash in the same way, and is even easier 2229 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0 2230 * kernel cmdline option. 2231 * 2232 * RETURNS: 2233 * Zero if everything went ok, nonzero otherwise. 2234 */ 2235 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) 2236 { 2237 struct drm_device *dev = fb_helper->dev; 2238 int count = 0; 2239 2240 if (!drm_fbdev_emulation) 2241 return 0; 2242 2243 mutex_lock(&dev->mode_config.mutex); 2244 count = drm_fb_helper_probe_connector_modes(fb_helper, 2245 dev->mode_config.max_width, 2246 dev->mode_config.max_height); 2247 mutex_unlock(&dev->mode_config.mutex); 2248 /* 2249 * we shouldn't end up with no modes here. 2250 */ 2251 if (count == 0) 2252 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n"); 2253 2254 drm_setup_crtcs(fb_helper); 2255 2256 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 2257 } 2258 EXPORT_SYMBOL(drm_fb_helper_initial_config); 2259 2260 /** 2261 * drm_fb_helper_hotplug_event - respond to a hotplug notification by 2262 * probing all the outputs attached to the fb 2263 * @fb_helper: the drm_fb_helper 2264 * 2265 * Scan the connectors attached to the fb_helper and try to put together a 2266 * setup after *notification of a change in output configuration. 2267 * 2268 * Called at runtime, takes the mode config locks to be able to check/change the 2269 * modeset configuration. Must be run from process context (which usually means 2270 * either the output polling work or a work item launched from the driver's 2271 * hotplug interrupt). 2272 * 2273 * Note that drivers may call this even before calling 2274 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows 2275 * for a race-free fbcon setup and will make sure that the fbdev emulation will 2276 * not miss any hotplug events. 2277 * 2278 * RETURNS: 2279 * 0 on success and a non-zero error code otherwise. 2280 */ 2281 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 2282 { 2283 struct drm_device *dev = fb_helper->dev; 2284 u32 max_width, max_height; 2285 2286 if (!drm_fbdev_emulation) 2287 return 0; 2288 2289 mutex_lock(&fb_helper->dev->mode_config.mutex); 2290 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) { 2291 fb_helper->delayed_hotplug = true; 2292 mutex_unlock(&fb_helper->dev->mode_config.mutex); 2293 return 0; 2294 } 2295 DRM_DEBUG_KMS("\n"); 2296 2297 max_width = fb_helper->fb->width; 2298 max_height = fb_helper->fb->height; 2299 2300 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height); 2301 mutex_unlock(&fb_helper->dev->mode_config.mutex); 2302 2303 drm_modeset_lock_all(dev); 2304 drm_setup_crtcs(fb_helper); 2305 drm_modeset_unlock_all(dev); 2306 drm_fb_helper_set_par(fb_helper->fbdev); 2307 2308 return 0; 2309 } 2310 EXPORT_SYMBOL(drm_fb_helper_hotplug_event); 2311 2312 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) 2313 * but the module doesn't depend on any fb console symbols. At least 2314 * attempt to load fbcon to avoid leaving the system without a usable console. 2315 */ 2316 int __init drm_fb_helper_modinit(void) 2317 { 2318 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) 2319 const char *name = "fbcon"; 2320 struct module *fbcon; 2321 2322 mutex_lock(&module_mutex); 2323 fbcon = find_module(name); 2324 mutex_unlock(&module_mutex); 2325 2326 if (!fbcon) 2327 request_module_nowait(name); 2328 #endif 2329 return 0; 2330 } 2331 EXPORT_SYMBOL(drm_fb_helper_modinit); 2332