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/console.h> 33 #include <linux/kernel.h> 34 #include <linux/sysrq.h> 35 #include <linux/slab.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 #include <drm/drm_atomic.h> 42 #include <drm/drm_atomic_helper.h> 43 44 #include "drm_crtc_helper_internal.h" 45 46 static bool drm_fbdev_emulation = true; 47 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600); 48 MODULE_PARM_DESC(fbdev_emulation, 49 "Enable legacy fbdev emulation [default=true]"); 50 51 static LINUX_LIST_HEAD(kernel_fb_helper_list); 52 static DEFINE_MUTEX(kernel_fb_helper_lock); 53 54 /** 55 * DOC: fbdev helpers 56 * 57 * The fb helper functions are useful to provide an fbdev on top of a drm kernel 58 * mode setting driver. They can be used mostly independently from the crtc 59 * helper functions used by many drivers to implement the kernel mode setting 60 * interfaces. 61 * 62 * Initialization is done as a four-step process with drm_fb_helper_prepare(), 63 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and 64 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the 65 * default behaviour can override the third step with their own code. 66 * Teardown is done with drm_fb_helper_fini(). 67 * 68 * At runtime drivers should restore the fbdev console by calling 69 * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback. 70 * They should also notify the fb helper code from updates to the output 71 * configuration by calling drm_fb_helper_hotplug_event(). For easier 72 * integration with the output polling code in drm_crtc_helper.c the modeset 73 * code provides a ->output_poll_changed callback. 74 * 75 * All other functions exported by the fb helper library can be used to 76 * implement the fbdev driver interface by the driver. 77 * 78 * It is possible, though perhaps somewhat tricky, to implement race-free 79 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare() 80 * helper must be called first to initialize the minimum required to make 81 * hotplug detection work. Drivers also need to make sure to properly set up 82 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init() 83 * it is safe to enable interrupts and start processing hotplug events. At the 84 * same time, drivers should initialize all modeset objects such as CRTCs, 85 * encoders and connectors. To finish up the fbdev helper initialization, the 86 * drm_fb_helper_init() function is called. To probe for all attached displays 87 * and set up an initial configuration using the detected hardware, drivers 88 * should call drm_fb_helper_single_add_all_connectors() followed by 89 * drm_fb_helper_initial_config(). 90 * 91 * If &drm_framebuffer_funcs ->dirty is set, the 92 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will 93 * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right 94 * away. This worker then calls the dirty() function ensuring that it will 95 * always run in process context since the fb_*() function could be running in 96 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io 97 * callback it will also schedule dirty_work with the damage collected from the 98 * mmap page writes. 99 */ 100 101 #define drm_fb_helper_for_each_connector(fbh, i__) \ 102 for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \ 103 i__ = 0; i__ < (fbh)->connector_count; i__++) 104 105 /** 106 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev 107 * emulation helper 108 * @fb_helper: fbdev initialized with drm_fb_helper_init 109 * 110 * This functions adds all the available connectors for use with the given 111 * fb_helper. This is a separate step to allow drivers to freely assign 112 * connectors to the fbdev, e.g. if some are reserved for special purposes or 113 * not adequate to be used for the fbcon. 114 * 115 * This function is protected against concurrent connector hotadds/removals 116 * using drm_fb_helper_add_one_connector() and 117 * drm_fb_helper_remove_one_connector(). 118 */ 119 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) 120 { 121 struct drm_device *dev = fb_helper->dev; 122 struct drm_connector *connector; 123 int i, ret; 124 125 if (!drm_fbdev_emulation) 126 return 0; 127 128 mutex_lock(&dev->mode_config.mutex); 129 drm_for_each_connector(connector, dev) { 130 ret = drm_fb_helper_add_one_connector(fb_helper, connector); 131 132 if (ret) 133 goto fail; 134 } 135 mutex_unlock(&dev->mode_config.mutex); 136 return 0; 137 fail: 138 drm_fb_helper_for_each_connector(fb_helper, i) { 139 struct drm_fb_helper_connector *fb_helper_connector = 140 fb_helper->connector_info[i]; 141 142 drm_connector_unreference(fb_helper_connector->connector); 143 144 kfree(fb_helper_connector); 145 fb_helper->connector_info[i] = NULL; 146 } 147 fb_helper->connector_count = 0; 148 mutex_unlock(&dev->mode_config.mutex); 149 150 return ret; 151 } 152 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); 153 154 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector) 155 { 156 struct drm_fb_helper_connector **temp; 157 struct drm_fb_helper_connector *fb_helper_connector; 158 159 if (!drm_fbdev_emulation) 160 return 0; 161 162 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex)); 163 if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) { 164 temp = krealloc(fb_helper->connector_info, 165 sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), 166 M_DRM, GFP_KERNEL); 167 if (!temp) 168 return -ENOMEM; 169 170 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1; 171 fb_helper->connector_info = temp; 172 } 173 174 175 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL); 176 if (!fb_helper_connector) 177 return -ENOMEM; 178 179 drm_connector_reference(connector); 180 fb_helper_connector->connector = connector; 181 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; 182 return 0; 183 } 184 EXPORT_SYMBOL(drm_fb_helper_add_one_connector); 185 186 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 187 struct drm_connector *connector) 188 { 189 struct drm_fb_helper_connector *fb_helper_connector; 190 int i, j; 191 192 if (!drm_fbdev_emulation) 193 return 0; 194 195 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex)); 196 197 for (i = 0; i < fb_helper->connector_count; i++) { 198 if (fb_helper->connector_info[i]->connector == connector) 199 break; 200 } 201 202 if (i == fb_helper->connector_count) 203 return -EINVAL; 204 fb_helper_connector = fb_helper->connector_info[i]; 205 drm_connector_unreference(fb_helper_connector->connector); 206 207 for (j = i + 1; j < fb_helper->connector_count; j++) { 208 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j]; 209 } 210 fb_helper->connector_count--; 211 kfree(fb_helper_connector); 212 213 return 0; 214 } 215 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector); 216 217 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper) 218 { 219 uint16_t *r_base, *g_base, *b_base; 220 int i; 221 222 if (helper->funcs->gamma_get == NULL) 223 return; 224 225 r_base = crtc->gamma_store; 226 g_base = r_base + crtc->gamma_size; 227 b_base = g_base + crtc->gamma_size; 228 229 for (i = 0; i < crtc->gamma_size; i++) 230 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i); 231 } 232 233 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc) 234 { 235 uint16_t *r_base, *g_base, *b_base; 236 237 if (crtc->funcs->gamma_set == NULL) 238 return; 239 240 r_base = crtc->gamma_store; 241 g_base = r_base + crtc->gamma_size; 242 b_base = g_base + crtc->gamma_size; 243 244 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, crtc->gamma_size); 245 } 246 247 /** 248 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter 249 * @info: fbdev registered by the helper 250 */ 251 int drm_fb_helper_debug_enter(struct fb_info *info) 252 { 253 struct drm_fb_helper *helper = info->par; 254 const struct drm_crtc_helper_funcs *funcs; 255 int i; 256 257 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 258 for (i = 0; i < helper->crtc_count; i++) { 259 struct drm_mode_set *mode_set = 260 &helper->crtc_info[i].mode_set; 261 262 if (!mode_set->crtc->enabled) 263 continue; 264 265 funcs = mode_set->crtc->helper_private; 266 if (funcs->mode_set_base_atomic == NULL) 267 continue; 268 269 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper); 270 funcs->mode_set_base_atomic(mode_set->crtc, 271 mode_set->fb, 272 mode_set->x, 273 mode_set->y, 274 ENTER_ATOMIC_MODE_SET); 275 } 276 } 277 278 return 0; 279 } 280 EXPORT_SYMBOL(drm_fb_helper_debug_enter); 281 282 /* Find the real fb for a given fb helper CRTC */ 283 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc) 284 { 285 struct drm_device *dev = crtc->dev; 286 struct drm_crtc *c; 287 288 drm_for_each_crtc(c, dev) { 289 if (crtc->base.id == c->base.id) 290 return c->primary->fb; 291 } 292 293 return NULL; 294 } 295 296 /** 297 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave 298 * @info: fbdev registered by the helper 299 */ 300 int drm_fb_helper_debug_leave(struct fb_info *info) 301 { 302 struct drm_fb_helper *helper = info->par; 303 struct drm_crtc *crtc; 304 const struct drm_crtc_helper_funcs *funcs; 305 struct drm_framebuffer *fb; 306 int i; 307 308 for (i = 0; i < helper->crtc_count; i++) { 309 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; 310 crtc = mode_set->crtc; 311 funcs = crtc->helper_private; 312 fb = drm_mode_config_fb(crtc); 313 314 if (!crtc->enabled) 315 continue; 316 317 if (!fb) { 318 DRM_ERROR("no fb to restore??\n"); 319 continue; 320 } 321 322 if (funcs->mode_set_base_atomic == NULL) 323 continue; 324 325 drm_fb_helper_restore_lut_atomic(mode_set->crtc); 326 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, 327 crtc->y, LEAVE_ATOMIC_MODE_SET); 328 } 329 330 return 0; 331 } 332 EXPORT_SYMBOL(drm_fb_helper_debug_leave); 333 334 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper) 335 { 336 struct drm_device *dev = fb_helper->dev; 337 struct drm_plane *plane; 338 struct drm_atomic_state *state; 339 int i, ret; 340 unsigned plane_mask; 341 342 state = drm_atomic_state_alloc(dev); 343 if (!state) 344 return -ENOMEM; 345 346 state->acquire_ctx = dev->mode_config.acquire_ctx; 347 retry: 348 plane_mask = 0; 349 drm_for_each_plane(plane, dev) { 350 struct drm_plane_state *plane_state; 351 352 plane_state = drm_atomic_get_plane_state(state, plane); 353 if (IS_ERR(plane_state)) { 354 ret = PTR_ERR(plane_state); 355 goto fail; 356 } 357 358 plane_state->rotation = DRM_ROTATE_0; 359 360 plane->old_fb = plane->fb; 361 plane_mask |= 1 << drm_plane_index(plane); 362 363 /* disable non-primary: */ 364 if (plane->type == DRM_PLANE_TYPE_PRIMARY) 365 continue; 366 367 ret = __drm_atomic_helper_disable_plane(plane, plane_state); 368 if (ret != 0) 369 goto fail; 370 } 371 372 for(i = 0; i < fb_helper->crtc_count; i++) { 373 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 374 375 ret = __drm_atomic_helper_set_config(mode_set, state); 376 if (ret != 0) 377 goto fail; 378 } 379 380 ret = drm_atomic_commit(state); 381 382 fail: 383 drm_atomic_clean_old_fb(dev, plane_mask, ret); 384 385 if (ret == -EDEADLK) 386 goto backoff; 387 388 drm_atomic_state_put(state); 389 return ret; 390 391 backoff: 392 drm_atomic_state_clear(state); 393 drm_atomic_legacy_backoff(state); 394 395 goto retry; 396 } 397 398 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper) 399 { 400 struct drm_device *dev = fb_helper->dev; 401 struct drm_plane *plane; 402 int i; 403 404 drm_warn_on_modeset_not_all_locked(dev); 405 406 if (dev->mode_config.funcs->atomic_commit) 407 return restore_fbdev_mode_atomic(fb_helper); 408 409 drm_for_each_plane(plane, dev) { 410 if (plane->type != DRM_PLANE_TYPE_PRIMARY) 411 drm_plane_force_disable(plane); 412 413 if (plane->rotation_property) 414 drm_mode_plane_set_obj_prop(plane, 415 plane->rotation_property, 416 DRM_ROTATE_0); 417 } 418 419 for (i = 0; i < fb_helper->crtc_count; i++) { 420 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 421 struct drm_crtc *crtc = mode_set->crtc; 422 int ret; 423 424 if (crtc->funcs->cursor_set2) { 425 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0); 426 if (ret) 427 return ret; 428 } else if (crtc->funcs->cursor_set) { 429 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0); 430 if (ret) 431 return ret; 432 } 433 434 ret = drm_mode_set_config_internal(mode_set); 435 if (ret) 436 return ret; 437 } 438 439 return 0; 440 } 441 442 /** 443 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration 444 * @fb_helper: fbcon to restore 445 * 446 * This should be called from driver's drm ->lastclose callback 447 * when implementing an fbcon on top of kms using this helper. This ensures that 448 * the user isn't greeted with a black screen when e.g. X dies. 449 * 450 * RETURNS: 451 * Zero if everything went ok, negative error code otherwise. 452 */ 453 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) 454 { 455 struct drm_device *dev = fb_helper->dev; 456 bool do_delayed; 457 int ret; 458 459 if (!drm_fbdev_emulation) 460 return -ENODEV; 461 462 drm_modeset_lock_all(dev); 463 ret = restore_fbdev_mode(fb_helper); 464 465 do_delayed = fb_helper->delayed_hotplug; 466 if (do_delayed) 467 fb_helper->delayed_hotplug = false; 468 drm_modeset_unlock_all(dev); 469 470 if (do_delayed) 471 drm_fb_helper_hotplug_event(fb_helper); 472 return ret; 473 } 474 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked); 475 476 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper) 477 { 478 struct drm_device *dev = fb_helper->dev; 479 struct drm_crtc *crtc; 480 int bound = 0, crtcs_bound = 0; 481 482 /* Sometimes user space wants everything disabled, so don't steal the 483 * display if there's a master. */ 484 if (READ_ONCE(dev->master)) 485 return false; 486 487 drm_for_each_crtc(crtc, dev) { 488 if (crtc->primary->fb) 489 crtcs_bound++; 490 if (crtc->primary->fb == fb_helper->fb) 491 bound++; 492 } 493 494 if (bound < crtcs_bound) 495 return false; 496 497 return true; 498 } 499 500 #ifdef CONFIG_MAGIC_SYSRQ 501 /* 502 * restore fbcon display for all kms driver's using this helper, used for sysrq 503 * and panic handling. 504 */ 505 static bool drm_fb_helper_force_kernel_mode(void) 506 { 507 bool ret, error = false; 508 struct drm_fb_helper *helper; 509 510 if (list_empty(&kernel_fb_helper_list)) 511 return false; 512 513 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 514 struct drm_device *dev = helper->dev; 515 516 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) 517 continue; 518 519 drm_modeset_lock_all(dev); 520 ret = restore_fbdev_mode(helper); 521 if (ret) 522 error = true; 523 drm_modeset_unlock_all(dev); 524 } 525 return error; 526 } 527 528 #if 0 529 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) 530 { 531 bool ret; 532 ret = drm_fb_helper_force_kernel_mode(); 533 if (ret == true) 534 DRM_ERROR("Failed to restore crtc configuration\n"); 535 } 536 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); 537 538 static void drm_fb_helper_sysrq(int dummy1) 539 { 540 schedule_work(&drm_fb_helper_restore_work); 541 } 542 543 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { 544 .handler = drm_fb_helper_sysrq, 545 .help_msg = "force-fb(V)", 546 .action_msg = "Restore framebuffer console", 547 }; 548 #else 549 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; 550 #endif 551 #endif 552 553 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) 554 { 555 struct drm_fb_helper *fb_helper = info->par; 556 struct drm_device *dev = fb_helper->dev; 557 struct drm_crtc *crtc; 558 struct drm_connector *connector; 559 int i, j; 560 561 /* 562 * For each CRTC in this fb, turn the connectors on/off. 563 */ 564 drm_modeset_lock_all(dev); 565 if (!drm_fb_helper_is_bound(fb_helper)) { 566 drm_modeset_unlock_all(dev); 567 return; 568 } 569 570 for (i = 0; i < fb_helper->crtc_count; i++) { 571 crtc = fb_helper->crtc_info[i].mode_set.crtc; 572 573 if (!crtc->enabled) 574 continue; 575 576 /* Walk the connectors & encoders on this fb turning them on/off */ 577 drm_fb_helper_for_each_connector(fb_helper, j) { 578 connector = fb_helper->connector_info[j]->connector; 579 connector->funcs->dpms(connector, dpms_mode); 580 drm_object_property_set_value(&connector->base, 581 dev->mode_config.dpms_property, dpms_mode); 582 } 583 } 584 drm_modeset_unlock_all(dev); 585 } 586 587 /** 588 * drm_fb_helper_blank - implementation for ->fb_blank 589 * @blank: desired blanking state 590 * @info: fbdev registered by the helper 591 */ 592 int drm_fb_helper_blank(int blank, struct fb_info *info) 593 { 594 if (oops_in_progress) 595 return -EBUSY; 596 597 switch (blank) { 598 /* Display: On; HSync: On, VSync: On */ 599 case FB_BLANK_UNBLANK: 600 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); 601 break; 602 #if 0 603 /* Display: Off; HSync: On, VSync: On */ 604 case FB_BLANK_NORMAL: 605 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 606 break; 607 /* Display: Off; HSync: Off, VSync: On */ 608 case FB_BLANK_HSYNC_SUSPEND: 609 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 610 break; 611 /* Display: Off; HSync: On, VSync: Off */ 612 case FB_BLANK_VSYNC_SUSPEND: 613 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); 614 break; 615 #endif 616 /* Display: Off; HSync: Off, VSync: Off */ 617 case FB_BLANK_POWERDOWN: 618 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); 619 break; 620 } 621 return 0; 622 } 623 EXPORT_SYMBOL(drm_fb_helper_blank); 624 625 static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper, 626 struct drm_mode_set *modeset) 627 { 628 int i; 629 630 for (i = 0; i < modeset->num_connectors; i++) { 631 drm_connector_unreference(modeset->connectors[i]); 632 modeset->connectors[i] = NULL; 633 } 634 modeset->num_connectors = 0; 635 636 drm_mode_destroy(helper->dev, modeset->mode); 637 modeset->mode = NULL; 638 639 /* FIXME should hold a ref? */ 640 modeset->fb = NULL; 641 } 642 643 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) 644 { 645 int i; 646 647 for (i = 0; i < helper->connector_count; i++) { 648 drm_connector_unreference(helper->connector_info[i]->connector); 649 kfree(helper->connector_info[i]); 650 } 651 kfree(helper->connector_info); 652 653 for (i = 0; i < helper->crtc_count; i++) { 654 struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set; 655 656 drm_fb_helper_modeset_release(helper, modeset); 657 kfree(modeset->connectors); 658 } 659 kfree(helper->crtc_info); 660 } 661 662 static void drm_fb_helper_resume_worker(struct work_struct *work) 663 { 664 #if 0 665 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, 666 resume_work); 667 668 console_lock(); 669 fb_set_suspend(helper->fbdev, 0); 670 console_unlock(); 671 #endif 672 } 673 674 static void drm_fb_helper_dirty_work(struct work_struct *work) 675 { 676 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, 677 dirty_work); 678 struct drm_clip_rect *clip = &helper->dirty_clip; 679 struct drm_clip_rect clip_copy; 680 unsigned long flags; 681 682 spin_lock_irqsave(&helper->dirty_lock, flags); 683 clip_copy = *clip; 684 clip->x1 = clip->y1 = ~0; 685 clip->x2 = clip->y2 = 0; 686 spin_unlock_irqrestore(&helper->dirty_lock, flags); 687 688 /* call dirty callback only when it has been really touched */ 689 if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) 690 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); 691 } 692 693 /** 694 * drm_fb_helper_prepare - setup a drm_fb_helper structure 695 * @dev: DRM device 696 * @helper: driver-allocated fbdev helper structure to set up 697 * @funcs: pointer to structure of functions associate with this helper 698 * 699 * Sets up the bare minimum to make the framebuffer helper usable. This is 700 * useful to implement race-free initialization of the polling helpers. 701 */ 702 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, 703 const struct drm_fb_helper_funcs *funcs) 704 { 705 INIT_LIST_HEAD(&helper->kernel_fb_list); 706 lockinit(&helper->dirty_lock, "drm_fb_helper dirty_lock", 0, LK_CANRECURSE); 707 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker); 708 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); 709 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0; 710 helper->funcs = funcs; 711 helper->dev = dev; 712 } 713 EXPORT_SYMBOL(drm_fb_helper_prepare); 714 715 /** 716 * drm_fb_helper_init - initialize a drm_fb_helper structure 717 * @dev: drm device 718 * @fb_helper: driver-allocated fbdev helper structure to initialize 719 * @crtc_count: maximum number of crtcs to support in this fbdev emulation 720 * @max_conn_count: max connector count 721 * 722 * This allocates the structures for the fbdev helper with the given limits. 723 * Note that this won't yet touch the hardware (through the driver interfaces) 724 * nor register the fbdev. This is only done in drm_fb_helper_initial_config() 725 * to allow driver writes more control over the exact init sequence. 726 * 727 * Drivers must call drm_fb_helper_prepare() before calling this function. 728 * 729 * RETURNS: 730 * Zero if everything went ok, nonzero otherwise. 731 */ 732 int drm_fb_helper_init(struct drm_device *dev, 733 struct drm_fb_helper *fb_helper, 734 int crtc_count, int max_conn_count) 735 { 736 struct drm_crtc *crtc; 737 int i; 738 739 if (!drm_fbdev_emulation) 740 return 0; 741 742 if (!max_conn_count) 743 return -EINVAL; 744 745 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); 746 if (!fb_helper->crtc_info) 747 return -ENOMEM; 748 749 fb_helper->crtc_count = crtc_count; 750 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); 751 if (!fb_helper->connector_info) { 752 kfree(fb_helper->crtc_info); 753 return -ENOMEM; 754 } 755 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector; 756 fb_helper->connector_count = 0; 757 758 for (i = 0; i < crtc_count; i++) { 759 fb_helper->crtc_info[i].mode_set.connectors = 760 kcalloc(max_conn_count, 761 sizeof(struct drm_connector *), 762 GFP_KERNEL); 763 764 if (!fb_helper->crtc_info[i].mode_set.connectors) 765 goto out_free; 766 fb_helper->crtc_info[i].mode_set.num_connectors = 0; 767 } 768 769 i = 0; 770 drm_for_each_crtc(crtc, dev) { 771 fb_helper->crtc_info[i].mode_set.crtc = crtc; 772 i++; 773 } 774 775 return 0; 776 out_free: 777 drm_fb_helper_crtc_free(fb_helper); 778 return -ENOMEM; 779 } 780 EXPORT_SYMBOL(drm_fb_helper_init); 781 782 /** 783 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members 784 * @fb_helper: driver-allocated fbdev helper 785 * 786 * A helper to alloc fb_info and the members cmap and apertures. Called 787 * by the driver within the fb_probe fb_helper callback function. 788 * 789 * RETURNS: 790 * fb_info pointer if things went okay, pointer containing error code 791 * otherwise 792 */ 793 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) 794 { 795 struct device *dev = fb_helper->dev->dev; 796 struct fb_info *info; 797 798 info = framebuffer_alloc(0, dev); 799 if (!info) 800 return ERR_PTR(-ENOMEM); 801 802 #if 0 803 ret = fb_alloc_cmap(&info->cmap, 256, 0); 804 if (ret) 805 goto err_release; 806 807 info->apertures = alloc_apertures(1); 808 if (!info->apertures) { 809 ret = -ENOMEM; 810 goto err_free_cmap; 811 } 812 #endif 813 814 fb_helper->fbdev = info; 815 816 return info; 817 818 #if 0 819 err_free_cmap: 820 fb_dealloc_cmap(&info->cmap); 821 err_release: 822 framebuffer_release(info); 823 return ERR_PTR(ret); 824 #endif 825 } 826 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi); 827 828 /** 829 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device 830 * @fb_helper: driver-allocated fbdev helper 831 * 832 * A wrapper around unregister_framebuffer, to release the fb_info 833 * framebuffer device 834 */ 835 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) 836 { 837 if (fb_helper && fb_helper->fbdev) 838 unregister_framebuffer(fb_helper->fbdev); 839 } 840 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi); 841 842 /** 843 * drm_fb_helper_release_fbi - dealloc fb_info and its members 844 * @fb_helper: driver-allocated fbdev helper 845 * 846 * A helper to free memory taken by fb_info and the members cmap and 847 * apertures 848 */ 849 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper) 850 { 851 if (fb_helper) { 852 struct fb_info *info = fb_helper->fbdev; 853 854 if (info) { 855 #if 0 856 if (info->cmap.len) 857 fb_dealloc_cmap(&info->cmap); 858 #endif 859 framebuffer_release(info); 860 } 861 862 fb_helper->fbdev = NULL; 863 } 864 } 865 EXPORT_SYMBOL(drm_fb_helper_release_fbi); 866 867 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) 868 { 869 if (!drm_fbdev_emulation) 870 return; 871 872 cancel_work_sync(&fb_helper->resume_work); 873 cancel_work_sync(&fb_helper->dirty_work); 874 875 mutex_lock(&kernel_fb_helper_lock); 876 if (!list_empty(&fb_helper->kernel_fb_list)) { 877 list_del(&fb_helper->kernel_fb_list); 878 if (list_empty(&kernel_fb_helper_list)) { 879 #if 0 880 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 881 #endif 882 } 883 } 884 mutex_unlock(&kernel_fb_helper_lock); 885 886 drm_fb_helper_crtc_free(fb_helper); 887 888 } 889 EXPORT_SYMBOL(drm_fb_helper_fini); 890 891 #if 0 892 /** 893 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer 894 * @fb_helper: driver-allocated fbdev helper 895 * 896 * A wrapper around unlink_framebuffer implemented by fbdev core 897 */ 898 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) 899 { 900 if (fb_helper && fb_helper->fbdev) 901 unlink_framebuffer(fb_helper->fbdev); 902 } 903 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); 904 905 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, 906 u32 width, u32 height) 907 { 908 struct drm_fb_helper *helper = info->par; 909 struct drm_clip_rect *clip = &helper->dirty_clip; 910 unsigned long flags; 911 912 if (!helper->fb->funcs->dirty) 913 return; 914 915 spin_lock_irqsave(&helper->dirty_lock, flags); 916 clip->x1 = min_t(u32, clip->x1, x); 917 clip->y1 = min_t(u32, clip->y1, y); 918 clip->x2 = max_t(u32, clip->x2, x + width); 919 clip->y2 = max_t(u32, clip->y2, y + height); 920 spin_unlock_irqrestore(&helper->dirty_lock, flags); 921 922 schedule_work(&helper->dirty_work); 923 } 924 925 /** 926 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function 927 * @info: fb_info struct pointer 928 * @pagelist: list of dirty mmap framebuffer pages 929 * 930 * This function is used as the &fb_deferred_io ->deferred_io 931 * callback function for flushing the fbdev mmap writes. 932 */ 933 void drm_fb_helper_deferred_io(struct fb_info *info, 934 struct list_head *pagelist) 935 { 936 unsigned long start, end, min, max; 937 struct page *page; 938 u32 y1, y2; 939 940 min = ULONG_MAX; 941 max = 0; 942 list_for_each_entry(page, pagelist, lru) { 943 start = page->index << PAGE_SHIFT; 944 end = start + PAGE_SIZE - 1; 945 min = min(min, start); 946 max = max(max, end); 947 } 948 949 if (min < max) { 950 y1 = min / info->fix.line_length; 951 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length), 952 info->var.yres); 953 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); 954 } 955 } 956 EXPORT_SYMBOL(drm_fb_helper_deferred_io); 957 958 /** 959 * drm_fb_helper_sys_read - wrapper around fb_sys_read 960 * @info: fb_info struct pointer 961 * @buf: userspace buffer to read from framebuffer memory 962 * @count: number of bytes to read from framebuffer memory 963 * @ppos: read offset within framebuffer memory 964 * 965 * A wrapper around fb_sys_read implemented by fbdev core 966 */ 967 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, 968 size_t count, loff_t *ppos) 969 { 970 return fb_sys_read(info, buf, count, ppos); 971 } 972 EXPORT_SYMBOL(drm_fb_helper_sys_read); 973 974 /** 975 * drm_fb_helper_sys_write - wrapper around fb_sys_write 976 * @info: fb_info struct pointer 977 * @buf: userspace buffer to write to framebuffer memory 978 * @count: number of bytes to write to framebuffer memory 979 * @ppos: write offset within framebuffer memory 980 * 981 * A wrapper around fb_sys_write implemented by fbdev core 982 */ 983 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, 984 size_t count, loff_t *ppos) 985 { 986 ssize_t ret; 987 988 ret = fb_sys_write(info, buf, count, ppos); 989 if (ret > 0) 990 drm_fb_helper_dirty(info, 0, 0, info->var.xres, 991 info->var.yres); 992 993 return ret; 994 } 995 EXPORT_SYMBOL(drm_fb_helper_sys_write); 996 997 /** 998 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect 999 * @info: fbdev registered by the helper 1000 * @rect: info about rectangle to fill 1001 * 1002 * A wrapper around sys_fillrect implemented by fbdev core 1003 */ 1004 void drm_fb_helper_sys_fillrect(struct fb_info *info, 1005 const struct fb_fillrect *rect) 1006 { 1007 sys_fillrect(info, rect); 1008 drm_fb_helper_dirty(info, rect->dx, rect->dy, 1009 rect->width, rect->height); 1010 } 1011 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); 1012 1013 /** 1014 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea 1015 * @info: fbdev registered by the helper 1016 * @area: info about area to copy 1017 * 1018 * A wrapper around sys_copyarea implemented by fbdev core 1019 */ 1020 void drm_fb_helper_sys_copyarea(struct fb_info *info, 1021 const struct fb_copyarea *area) 1022 { 1023 sys_copyarea(info, area); 1024 drm_fb_helper_dirty(info, area->dx, area->dy, 1025 area->width, area->height); 1026 } 1027 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); 1028 1029 /** 1030 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit 1031 * @info: fbdev registered by the helper 1032 * @image: info about image to blit 1033 * 1034 * A wrapper around sys_imageblit implemented by fbdev core 1035 */ 1036 void drm_fb_helper_sys_imageblit(struct fb_info *info, 1037 const struct fb_image *image) 1038 { 1039 sys_imageblit(info, image); 1040 drm_fb_helper_dirty(info, image->dx, image->dy, 1041 image->width, image->height); 1042 } 1043 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); 1044 1045 /** 1046 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect 1047 * @info: fbdev registered by the helper 1048 * @rect: info about rectangle to fill 1049 * 1050 * A wrapper around cfb_imageblit implemented by fbdev core 1051 */ 1052 void drm_fb_helper_cfb_fillrect(struct fb_info *info, 1053 const struct fb_fillrect *rect) 1054 { 1055 cfb_fillrect(info, rect); 1056 drm_fb_helper_dirty(info, rect->dx, rect->dy, 1057 rect->width, rect->height); 1058 } 1059 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); 1060 1061 /** 1062 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea 1063 * @info: fbdev registered by the helper 1064 * @area: info about area to copy 1065 * 1066 * A wrapper around cfb_copyarea implemented by fbdev core 1067 */ 1068 void drm_fb_helper_cfb_copyarea(struct fb_info *info, 1069 const struct fb_copyarea *area) 1070 { 1071 cfb_copyarea(info, area); 1072 drm_fb_helper_dirty(info, area->dx, area->dy, 1073 area->width, area->height); 1074 } 1075 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); 1076 1077 /** 1078 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit 1079 * @info: fbdev registered by the helper 1080 * @image: info about image to blit 1081 * 1082 * A wrapper around cfb_imageblit implemented by fbdev core 1083 */ 1084 void drm_fb_helper_cfb_imageblit(struct fb_info *info, 1085 const struct fb_image *image) 1086 { 1087 cfb_imageblit(info, image); 1088 drm_fb_helper_dirty(info, image->dx, image->dy, 1089 image->width, image->height); 1090 } 1091 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); 1092 1093 /** 1094 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend 1095 * @fb_helper: driver-allocated fbdev helper 1096 * @suspend: whether to suspend or resume 1097 * 1098 * A wrapper around fb_set_suspend implemented by fbdev core. 1099 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take 1100 * the lock yourself 1101 */ 1102 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend) 1103 { 1104 if (fb_helper && fb_helper->fbdev) 1105 fb_set_suspend(fb_helper->fbdev, suspend); 1106 } 1107 EXPORT_SYMBOL(drm_fb_helper_set_suspend); 1108 1109 /** 1110 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also 1111 * takes the console lock 1112 * @fb_helper: driver-allocated fbdev helper 1113 * @suspend: whether to suspend or resume 1114 * 1115 * A wrapper around fb_set_suspend() that takes the console lock. If the lock 1116 * isn't available on resume, a worker is tasked with waiting for the lock 1117 * to become available. The console lock can be pretty contented on resume 1118 * due to all the printk activity. 1119 * 1120 * This function can be called multiple times with the same state since 1121 * &fb_info->state is checked to see if fbdev is running or not before locking. 1122 * 1123 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself. 1124 */ 1125 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, 1126 bool suspend) 1127 { 1128 if (!fb_helper || !fb_helper->fbdev) 1129 return; 1130 1131 /* make sure there's no pending/ongoing resume */ 1132 flush_work(&fb_helper->resume_work); 1133 1134 if (suspend) { 1135 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING) 1136 return; 1137 1138 console_lock(); 1139 1140 } else { 1141 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING) 1142 return; 1143 1144 if (!console_trylock()) { 1145 schedule_work(&fb_helper->resume_work); 1146 return; 1147 } 1148 } 1149 1150 fb_set_suspend(fb_helper->fbdev, suspend); 1151 console_unlock(); 1152 } 1153 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked); 1154 1155 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green, 1156 u16 blue, u16 regno, struct fb_info *info) 1157 { 1158 struct drm_fb_helper *fb_helper = info->par; 1159 struct drm_framebuffer *fb = fb_helper->fb; 1160 1161 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 1162 u32 *palette; 1163 u32 value; 1164 /* place color in psuedopalette */ 1165 if (regno > 16) 1166 return -EINVAL; 1167 palette = (u32 *)info->pseudo_palette; 1168 red >>= (16 - info->var.red.length); 1169 green >>= (16 - info->var.green.length); 1170 blue >>= (16 - info->var.blue.length); 1171 value = (red << info->var.red.offset) | 1172 (green << info->var.green.offset) | 1173 (blue << info->var.blue.offset); 1174 if (info->var.transp.length > 0) { 1175 u32 mask = (1 << info->var.transp.length) - 1; 1176 mask <<= info->var.transp.offset; 1177 value |= mask; 1178 } 1179 palette[regno] = value; 1180 return 0; 1181 } 1182 1183 /* 1184 * The driver really shouldn't advertise pseudo/directcolor 1185 * visuals if it can't deal with the palette. 1186 */ 1187 if (WARN_ON(!fb_helper->funcs->gamma_set || 1188 !fb_helper->funcs->gamma_get)) 1189 return -EINVAL; 1190 1191 WARN_ON(fb->bits_per_pixel != 8); 1192 1193 fb_helper->funcs->gamma_set(crtc, red, green, blue, regno); 1194 1195 return 0; 1196 } 1197 1198 /** 1199 * drm_fb_helper_setcmap - implementation for ->fb_setcmap 1200 * @cmap: cmap to set 1201 * @info: fbdev registered by the helper 1202 */ 1203 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) 1204 { 1205 struct drm_fb_helper *fb_helper = info->par; 1206 struct drm_device *dev = fb_helper->dev; 1207 const struct drm_crtc_helper_funcs *crtc_funcs; 1208 u16 *red, *green, *blue, *transp; 1209 struct drm_crtc *crtc; 1210 int i, j, rc = 0; 1211 int start; 1212 1213 if (oops_in_progress) 1214 return -EBUSY; 1215 1216 drm_modeset_lock_all(dev); 1217 if (!drm_fb_helper_is_bound(fb_helper)) { 1218 drm_modeset_unlock_all(dev); 1219 return -EBUSY; 1220 } 1221 1222 for (i = 0; i < fb_helper->crtc_count; i++) { 1223 crtc = fb_helper->crtc_info[i].mode_set.crtc; 1224 crtc_funcs = crtc->helper_private; 1225 1226 red = cmap->red; 1227 green = cmap->green; 1228 blue = cmap->blue; 1229 transp = cmap->transp; 1230 start = cmap->start; 1231 1232 for (j = 0; j < cmap->len; j++) { 1233 u16 hred, hgreen, hblue, htransp = 0xffff; 1234 1235 hred = *red++; 1236 hgreen = *green++; 1237 hblue = *blue++; 1238 1239 if (transp) 1240 htransp = *transp++; 1241 1242 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info); 1243 if (rc) 1244 goto out; 1245 } 1246 if (crtc_funcs->load_lut) 1247 crtc_funcs->load_lut(crtc); 1248 } 1249 out: 1250 drm_modeset_unlock_all(dev); 1251 return rc; 1252 } 1253 EXPORT_SYMBOL(drm_fb_helper_setcmap); 1254 1255 /** 1256 * drm_fb_helper_check_var - implementation for ->fb_check_var 1257 * @var: screeninfo to check 1258 * @info: fbdev registered by the helper 1259 */ 1260 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 1261 struct fb_info *info) 1262 { 1263 struct drm_fb_helper *fb_helper = info->par; 1264 struct drm_framebuffer *fb = fb_helper->fb; 1265 int depth; 1266 1267 if (var->pixclock != 0 || in_dbg_master()) 1268 return -EINVAL; 1269 1270 /* 1271 * Changes struct fb_var_screeninfo are currently not pushed back 1272 * to KMS, hence fail if different settings are requested. 1273 */ 1274 if (var->bits_per_pixel != fb->bits_per_pixel || 1275 var->xres > fb->width || var->yres > fb->height || 1276 var->xres_virtual > fb->width || var->yres_virtual > fb->height) { 1277 DRM_DEBUG("fb requested width/height/bpp can't fit in current fb " 1278 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", 1279 var->xres, var->yres, var->bits_per_pixel, 1280 var->xres_virtual, var->yres_virtual, 1281 fb->width, fb->height, fb->bits_per_pixel); 1282 return -EINVAL; 1283 } 1284 1285 switch (var->bits_per_pixel) { 1286 case 16: 1287 depth = (var->green.length == 6) ? 16 : 15; 1288 break; 1289 case 32: 1290 depth = (var->transp.length > 0) ? 32 : 24; 1291 break; 1292 default: 1293 depth = var->bits_per_pixel; 1294 break; 1295 } 1296 1297 switch (depth) { 1298 case 8: 1299 var->red.offset = 0; 1300 var->green.offset = 0; 1301 var->blue.offset = 0; 1302 var->red.length = 8; 1303 var->green.length = 8; 1304 var->blue.length = 8; 1305 var->transp.length = 0; 1306 var->transp.offset = 0; 1307 break; 1308 case 15: 1309 var->red.offset = 10; 1310 var->green.offset = 5; 1311 var->blue.offset = 0; 1312 var->red.length = 5; 1313 var->green.length = 5; 1314 var->blue.length = 5; 1315 var->transp.length = 1; 1316 var->transp.offset = 15; 1317 break; 1318 case 16: 1319 var->red.offset = 11; 1320 var->green.offset = 5; 1321 var->blue.offset = 0; 1322 var->red.length = 5; 1323 var->green.length = 6; 1324 var->blue.length = 5; 1325 var->transp.length = 0; 1326 var->transp.offset = 0; 1327 break; 1328 case 24: 1329 var->red.offset = 16; 1330 var->green.offset = 8; 1331 var->blue.offset = 0; 1332 var->red.length = 8; 1333 var->green.length = 8; 1334 var->blue.length = 8; 1335 var->transp.length = 0; 1336 var->transp.offset = 0; 1337 break; 1338 case 32: 1339 var->red.offset = 16; 1340 var->green.offset = 8; 1341 var->blue.offset = 0; 1342 var->red.length = 8; 1343 var->green.length = 8; 1344 var->blue.length = 8; 1345 var->transp.length = 8; 1346 var->transp.offset = 24; 1347 break; 1348 default: 1349 return -EINVAL; 1350 } 1351 return 0; 1352 } 1353 EXPORT_SYMBOL(drm_fb_helper_check_var); 1354 #endif 1355 1356 /** 1357 * drm_fb_helper_set_par - implementation for ->fb_set_par 1358 * @info: fbdev registered by the helper 1359 * 1360 * This will let fbcon do the mode init and is called at initialization time by 1361 * the fbdev core when registering the driver, and later on through the hotplug 1362 * callback. 1363 */ 1364 int drm_fb_helper_set_par(struct fb_info *info) 1365 { 1366 struct drm_fb_helper *fb_helper = info->par; 1367 #if 0 1368 struct fb_var_screeninfo *var = &info->var; 1369 #endif 1370 1371 if (oops_in_progress) 1372 return -EBUSY; 1373 1374 #if 0 1375 if (var->pixclock != 0) { 1376 DRM_ERROR("PIXEL CLOCK SET\n"); 1377 return -EINVAL; 1378 } 1379 #endif 1380 1381 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); 1382 1383 return 0; 1384 } 1385 EXPORT_SYMBOL(drm_fb_helper_set_par); 1386 1387 #if 0 1388 static int pan_display_atomic(struct fb_var_screeninfo *var, 1389 struct fb_info *info) 1390 { 1391 struct drm_fb_helper *fb_helper = info->par; 1392 struct drm_device *dev = fb_helper->dev; 1393 struct drm_atomic_state *state; 1394 struct drm_plane *plane; 1395 int i, ret; 1396 unsigned plane_mask; 1397 1398 state = drm_atomic_state_alloc(dev); 1399 if (!state) 1400 return -ENOMEM; 1401 1402 state->acquire_ctx = dev->mode_config.acquire_ctx; 1403 retry: 1404 plane_mask = 0; 1405 for(i = 0; i < fb_helper->crtc_count; i++) { 1406 struct drm_mode_set *mode_set; 1407 1408 mode_set = &fb_helper->crtc_info[i].mode_set; 1409 1410 mode_set->x = var->xoffset; 1411 mode_set->y = var->yoffset; 1412 1413 ret = __drm_atomic_helper_set_config(mode_set, state); 1414 if (ret != 0) 1415 goto fail; 1416 1417 plane = mode_set->crtc->primary; 1418 plane_mask |= (1 << drm_plane_index(plane)); 1419 plane->old_fb = plane->fb; 1420 } 1421 1422 ret = drm_atomic_commit(state); 1423 if (ret != 0) 1424 goto fail; 1425 1426 info->var.xoffset = var->xoffset; 1427 info->var.yoffset = var->yoffset; 1428 1429 fail: 1430 drm_atomic_clean_old_fb(dev, plane_mask, ret); 1431 1432 if (ret == -EDEADLK) 1433 goto backoff; 1434 1435 drm_atomic_state_put(state); 1436 return ret; 1437 1438 backoff: 1439 drm_atomic_state_clear(state); 1440 drm_atomic_legacy_backoff(state); 1441 1442 goto retry; 1443 } 1444 1445 /** 1446 * drm_fb_helper_pan_display - implementation for ->fb_pan_display 1447 * @var: updated screen information 1448 * @info: fbdev registered by the helper 1449 */ 1450 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 1451 struct fb_info *info) 1452 { 1453 struct drm_fb_helper *fb_helper = info->par; 1454 struct drm_device *dev = fb_helper->dev; 1455 struct drm_mode_set *modeset; 1456 int ret = 0; 1457 int i; 1458 1459 if (oops_in_progress) 1460 return -EBUSY; 1461 1462 drm_modeset_lock_all(dev); 1463 if (!drm_fb_helper_is_bound(fb_helper)) { 1464 drm_modeset_unlock_all(dev); 1465 return -EBUSY; 1466 } 1467 1468 if (dev->mode_config.funcs->atomic_commit) { 1469 ret = pan_display_atomic(var, info); 1470 goto unlock; 1471 } 1472 1473 for (i = 0; i < fb_helper->crtc_count; i++) { 1474 modeset = &fb_helper->crtc_info[i].mode_set; 1475 1476 modeset->x = var->xoffset; 1477 modeset->y = var->yoffset; 1478 1479 if (modeset->num_connectors) { 1480 ret = drm_mode_set_config_internal(modeset); 1481 if (!ret) { 1482 info->var.xoffset = var->xoffset; 1483 info->var.yoffset = var->yoffset; 1484 } 1485 } 1486 } 1487 unlock: 1488 drm_modeset_unlock_all(dev); 1489 return ret; 1490 } 1491 EXPORT_SYMBOL(drm_fb_helper_pan_display); 1492 #endif 1493 1494 /* 1495 * Allocates the backing storage and sets up the fbdev info structure through 1496 * the ->fb_probe callback and then registers the fbdev and sets up the panic 1497 * notifier. 1498 */ 1499 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, 1500 int preferred_bpp) 1501 { 1502 int ret = 0; 1503 int crtc_count = 0; 1504 int i; 1505 struct drm_fb_helper_surface_size sizes; 1506 int gamma_size = 0; 1507 1508 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); 1509 sizes.surface_depth = 24; 1510 sizes.surface_bpp = 32; 1511 sizes.fb_width = (unsigned)-1; 1512 sizes.fb_height = (unsigned)-1; 1513 1514 /* if driver picks 8 or 16 by default use that 1515 for both depth/bpp */ 1516 if (preferred_bpp != sizes.surface_bpp) 1517 sizes.surface_depth = sizes.surface_bpp = preferred_bpp; 1518 1519 /* first up get a count of crtcs now in use and new min/maxes width/heights */ 1520 drm_fb_helper_for_each_connector(fb_helper, i) { 1521 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; 1522 struct drm_cmdline_mode *cmdline_mode; 1523 1524 cmdline_mode = &fb_helper_conn->connector->cmdline_mode; 1525 1526 if (cmdline_mode->bpp_specified) { 1527 switch (cmdline_mode->bpp) { 1528 case 8: 1529 sizes.surface_depth = sizes.surface_bpp = 8; 1530 break; 1531 case 15: 1532 sizes.surface_depth = 15; 1533 sizes.surface_bpp = 16; 1534 break; 1535 case 16: 1536 sizes.surface_depth = sizes.surface_bpp = 16; 1537 break; 1538 case 24: 1539 sizes.surface_depth = sizes.surface_bpp = 24; 1540 break; 1541 case 32: 1542 sizes.surface_depth = 24; 1543 sizes.surface_bpp = 32; 1544 break; 1545 } 1546 break; 1547 } 1548 } 1549 1550 crtc_count = 0; 1551 for (i = 0; i < fb_helper->crtc_count; i++) { 1552 struct drm_display_mode *desired_mode; 1553 struct drm_mode_set *mode_set; 1554 int x, y, j; 1555 /* in case of tile group, are we the last tile vert or horiz? 1556 * If no tile group you are always the last one both vertically 1557 * and horizontally 1558 */ 1559 bool lastv = true, lasth = true; 1560 1561 desired_mode = fb_helper->crtc_info[i].desired_mode; 1562 mode_set = &fb_helper->crtc_info[i].mode_set; 1563 1564 if (!desired_mode) 1565 continue; 1566 1567 crtc_count++; 1568 1569 x = fb_helper->crtc_info[i].x; 1570 y = fb_helper->crtc_info[i].y; 1571 1572 if (gamma_size == 0) 1573 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; 1574 1575 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width); 1576 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height); 1577 1578 for (j = 0; j < mode_set->num_connectors; j++) { 1579 struct drm_connector *connector = mode_set->connectors[j]; 1580 if (connector->has_tile) { 1581 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1)); 1582 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1)); 1583 /* cloning to multiple tiles is just crazy-talk, so: */ 1584 break; 1585 } 1586 } 1587 1588 if (lasth) 1589 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width); 1590 if (lastv) 1591 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height); 1592 } 1593 1594 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { 1595 /* hmm everyone went away - assume VGA cable just fell out 1596 and will come back later. */ 1597 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n"); 1598 sizes.fb_width = sizes.surface_width = 1024; 1599 sizes.fb_height = sizes.surface_height = 768; 1600 } 1601 1602 /* push down into drivers */ 1603 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); 1604 if (ret < 0) 1605 return ret; 1606 1607 /* 1608 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug 1609 * events, but at init time drm_setup_crtcs needs to be called before 1610 * the fb is allocated (since we need to figure out the desired size of 1611 * the fb before we can allocate it ...). Hence we need to fix things up 1612 * here again. 1613 */ 1614 for (i = 0; i < fb_helper->crtc_count; i++) 1615 if (fb_helper->crtc_info[i].mode_set.num_connectors) 1616 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; 1617 1618 return 0; 1619 } 1620 1621 #if 0 1622 /** 1623 * drm_fb_helper_fill_fix - initializes fixed fbdev information 1624 * @info: fbdev registered by the helper 1625 * @pitch: desired pitch 1626 * @depth: desired depth 1627 * 1628 * Helper to fill in the fixed fbdev information useful for a non-accelerated 1629 * fbdev emulations. Drivers which support acceleration methods which impose 1630 * additional constraints need to set up their own limits. 1631 * 1632 * Drivers should call this (or their equivalent setup code) from their 1633 * ->fb_probe callback. 1634 */ 1635 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 1636 uint32_t depth) 1637 { 1638 info->fix.type = FB_TYPE_PACKED_PIXELS; 1639 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : 1640 FB_VISUAL_TRUECOLOR; 1641 info->fix.mmio_start = 0; 1642 info->fix.mmio_len = 0; 1643 info->fix.type_aux = 0; 1644 info->fix.xpanstep = 1; /* doing it in hw */ 1645 info->fix.ypanstep = 1; /* doing it in hw */ 1646 info->fix.ywrapstep = 0; 1647 info->fix.accel = FB_ACCEL_NONE; 1648 1649 info->fix.line_length = pitch; 1650 return; 1651 } 1652 EXPORT_SYMBOL(drm_fb_helper_fill_fix); 1653 1654 /** 1655 * drm_fb_helper_fill_var - initalizes variable fbdev information 1656 * @info: fbdev instance to set up 1657 * @fb_helper: fb helper instance to use as template 1658 * @fb_width: desired fb width 1659 * @fb_height: desired fb height 1660 * 1661 * Sets up the variable fbdev metainformation from the given fb helper instance 1662 * and the drm framebuffer allocated in fb_helper->fb. 1663 * 1664 * Drivers should call this (or their equivalent setup code) from their 1665 * ->fb_probe callback after having allocated the fbdev backing 1666 * storage framebuffer. 1667 */ 1668 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 1669 uint32_t fb_width, uint32_t fb_height) 1670 { 1671 struct drm_framebuffer *fb = fb_helper->fb; 1672 info->pseudo_palette = fb_helper->pseudo_palette; 1673 info->var.xres_virtual = fb->width; 1674 info->var.yres_virtual = fb->height; 1675 info->var.bits_per_pixel = fb->bits_per_pixel; 1676 info->var.accel_flags = FB_ACCELF_TEXT; 1677 info->var.xoffset = 0; 1678 info->var.yoffset = 0; 1679 info->var.activate = FB_ACTIVATE_NOW; 1680 info->var.height = -1; 1681 info->var.width = -1; 1682 1683 switch (fb->depth) { 1684 case 8: 1685 info->var.red.offset = 0; 1686 info->var.green.offset = 0; 1687 info->var.blue.offset = 0; 1688 info->var.red.length = 8; /* 8bit DAC */ 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 15: 1695 info->var.red.offset = 10; 1696 info->var.green.offset = 5; 1697 info->var.blue.offset = 0; 1698 info->var.red.length = 5; 1699 info->var.green.length = 5; 1700 info->var.blue.length = 5; 1701 info->var.transp.offset = 15; 1702 info->var.transp.length = 1; 1703 break; 1704 case 16: 1705 info->var.red.offset = 11; 1706 info->var.green.offset = 5; 1707 info->var.blue.offset = 0; 1708 info->var.red.length = 5; 1709 info->var.green.length = 6; 1710 info->var.blue.length = 5; 1711 info->var.transp.offset = 0; 1712 break; 1713 case 24: 1714 info->var.red.offset = 16; 1715 info->var.green.offset = 8; 1716 info->var.blue.offset = 0; 1717 info->var.red.length = 8; 1718 info->var.green.length = 8; 1719 info->var.blue.length = 8; 1720 info->var.transp.offset = 0; 1721 info->var.transp.length = 0; 1722 break; 1723 case 32: 1724 info->var.red.offset = 16; 1725 info->var.green.offset = 8; 1726 info->var.blue.offset = 0; 1727 info->var.red.length = 8; 1728 info->var.green.length = 8; 1729 info->var.blue.length = 8; 1730 info->var.transp.offset = 24; 1731 info->var.transp.length = 8; 1732 break; 1733 default: 1734 break; 1735 } 1736 1737 info->var.xres = fb_width; 1738 info->var.yres = fb_height; 1739 } 1740 EXPORT_SYMBOL(drm_fb_helper_fill_var); 1741 #endif 1742 1743 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, 1744 uint32_t maxX, 1745 uint32_t maxY) 1746 { 1747 struct drm_connector *connector; 1748 int count = 0; 1749 int i; 1750 1751 drm_fb_helper_for_each_connector(fb_helper, i) { 1752 connector = fb_helper->connector_info[i]->connector; 1753 count += connector->funcs->fill_modes(connector, maxX, maxY); 1754 } 1755 1756 return count; 1757 } 1758 1759 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) 1760 { 1761 struct drm_display_mode *mode; 1762 1763 list_for_each_entry(mode, &fb_connector->connector->modes, head) { 1764 if (mode->hdisplay > width || 1765 mode->vdisplay > height) 1766 continue; 1767 if (mode->type & DRM_MODE_TYPE_PREFERRED) 1768 return mode; 1769 } 1770 return NULL; 1771 } 1772 EXPORT_SYMBOL(drm_has_preferred_mode); 1773 1774 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) 1775 { 1776 return fb_connector->connector->cmdline_mode.specified; 1777 } 1778 1779 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 1780 int width, int height) 1781 { 1782 struct drm_cmdline_mode *cmdline_mode; 1783 struct drm_display_mode *mode; 1784 bool prefer_non_interlace; 1785 1786 cmdline_mode = &fb_helper_conn->connector->cmdline_mode; 1787 if (cmdline_mode->specified == false) 1788 return NULL; 1789 1790 /* attempt to find a matching mode in the list of modes 1791 * we have gotten so far, if not add a CVT mode that conforms 1792 */ 1793 if (cmdline_mode->rb || cmdline_mode->margins) 1794 goto create_mode; 1795 1796 prefer_non_interlace = !cmdline_mode->interlace; 1797 again: 1798 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1799 /* check width/height */ 1800 if (mode->hdisplay != cmdline_mode->xres || 1801 mode->vdisplay != cmdline_mode->yres) 1802 continue; 1803 1804 if (cmdline_mode->refresh_specified) { 1805 if (mode->vrefresh != cmdline_mode->refresh) 1806 continue; 1807 } 1808 1809 if (cmdline_mode->interlace) { 1810 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) 1811 continue; 1812 } else if (prefer_non_interlace) { 1813 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 1814 continue; 1815 } 1816 return mode; 1817 } 1818 1819 if (prefer_non_interlace) { 1820 prefer_non_interlace = false; 1821 goto again; 1822 } 1823 1824 create_mode: 1825 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, 1826 cmdline_mode); 1827 list_add(&mode->head, &fb_helper_conn->connector->modes); 1828 return mode; 1829 } 1830 EXPORT_SYMBOL(drm_pick_cmdline_mode); 1831 1832 static bool drm_connector_enabled(struct drm_connector *connector, bool strict) 1833 { 1834 bool enable; 1835 1836 if (strict) 1837 enable = connector->status == connector_status_connected; 1838 else 1839 enable = connector->status != connector_status_disconnected; 1840 1841 return enable; 1842 } 1843 1844 static void drm_enable_connectors(struct drm_fb_helper *fb_helper, 1845 bool *enabled) 1846 { 1847 bool any_enabled = false; 1848 struct drm_connector *connector; 1849 int i = 0; 1850 1851 drm_fb_helper_for_each_connector(fb_helper, i) { 1852 connector = fb_helper->connector_info[i]->connector; 1853 enabled[i] = drm_connector_enabled(connector, true); 1854 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, 1855 enabled[i] ? "yes" : "no"); 1856 any_enabled |= enabled[i]; 1857 } 1858 1859 if (any_enabled) 1860 return; 1861 1862 drm_fb_helper_for_each_connector(fb_helper, i) { 1863 connector = fb_helper->connector_info[i]->connector; 1864 enabled[i] = drm_connector_enabled(connector, false); 1865 } 1866 } 1867 1868 static bool drm_target_cloned(struct drm_fb_helper *fb_helper, 1869 struct drm_display_mode **modes, 1870 struct drm_fb_offset *offsets, 1871 bool *enabled, int width, int height) 1872 { 1873 int count, i, j; 1874 bool can_clone = false; 1875 struct drm_fb_helper_connector *fb_helper_conn; 1876 struct drm_display_mode *dmt_mode, *mode; 1877 1878 /* only contemplate cloning in the single crtc case */ 1879 if (fb_helper->crtc_count > 1) 1880 return false; 1881 1882 count = 0; 1883 drm_fb_helper_for_each_connector(fb_helper, i) { 1884 if (enabled[i]) 1885 count++; 1886 } 1887 1888 /* only contemplate cloning if more than one connector is enabled */ 1889 if (count <= 1) 1890 return false; 1891 1892 /* check the command line or if nothing common pick 1024x768 */ 1893 can_clone = true; 1894 drm_fb_helper_for_each_connector(fb_helper, i) { 1895 if (!enabled[i]) 1896 continue; 1897 fb_helper_conn = fb_helper->connector_info[i]; 1898 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1899 if (!modes[i]) { 1900 can_clone = false; 1901 break; 1902 } 1903 for (j = 0; j < i; j++) { 1904 if (!enabled[j]) 1905 continue; 1906 if (!drm_mode_equal(modes[j], modes[i])) 1907 can_clone = false; 1908 } 1909 } 1910 1911 if (can_clone) { 1912 DRM_DEBUG_KMS("can clone using command line\n"); 1913 return true; 1914 } 1915 1916 /* try and find a 1024x768 mode on each connector */ 1917 can_clone = true; 1918 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false); 1919 1920 drm_fb_helper_for_each_connector(fb_helper, i) { 1921 if (!enabled[i]) 1922 continue; 1923 1924 fb_helper_conn = fb_helper->connector_info[i]; 1925 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1926 if (drm_mode_equal(mode, dmt_mode)) 1927 modes[i] = mode; 1928 } 1929 if (!modes[i]) 1930 can_clone = false; 1931 } 1932 1933 if (can_clone) { 1934 DRM_DEBUG_KMS("can clone using 1024x768\n"); 1935 return true; 1936 } 1937 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); 1938 return false; 1939 } 1940 1941 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper, 1942 struct drm_display_mode **modes, 1943 struct drm_fb_offset *offsets, 1944 int idx, 1945 int h_idx, int v_idx) 1946 { 1947 struct drm_fb_helper_connector *fb_helper_conn; 1948 int i; 1949 int hoffset = 0, voffset = 0; 1950 1951 drm_fb_helper_for_each_connector(fb_helper, i) { 1952 fb_helper_conn = fb_helper->connector_info[i]; 1953 if (!fb_helper_conn->connector->has_tile) 1954 continue; 1955 1956 if (!modes[i] && (h_idx || v_idx)) { 1957 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i, 1958 fb_helper_conn->connector->base.id); 1959 continue; 1960 } 1961 if (fb_helper_conn->connector->tile_h_loc < h_idx) 1962 hoffset += modes[i]->hdisplay; 1963 1964 if (fb_helper_conn->connector->tile_v_loc < v_idx) 1965 voffset += modes[i]->vdisplay; 1966 } 1967 offsets[idx].x = hoffset; 1968 offsets[idx].y = voffset; 1969 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx); 1970 return 0; 1971 } 1972 1973 static bool drm_target_preferred(struct drm_fb_helper *fb_helper, 1974 struct drm_display_mode **modes, 1975 struct drm_fb_offset *offsets, 1976 bool *enabled, int width, int height) 1977 { 1978 struct drm_fb_helper_connector *fb_helper_conn; 1979 const u64 mask = BIT_ULL(fb_helper->connector_count) - 1; 1980 u64 conn_configured = 0; 1981 int tile_pass = 0; 1982 int i; 1983 1984 retry: 1985 drm_fb_helper_for_each_connector(fb_helper, i) { 1986 fb_helper_conn = fb_helper->connector_info[i]; 1987 1988 if (conn_configured & BIT_ULL(i)) 1989 continue; 1990 1991 if (enabled[i] == false) { 1992 conn_configured |= BIT_ULL(i); 1993 continue; 1994 } 1995 1996 /* first pass over all the untiled connectors */ 1997 if (tile_pass == 0 && fb_helper_conn->connector->has_tile) 1998 continue; 1999 2000 if (tile_pass == 1) { 2001 if (fb_helper_conn->connector->tile_h_loc != 0 || 2002 fb_helper_conn->connector->tile_v_loc != 0) 2003 continue; 2004 2005 } else { 2006 if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 && 2007 fb_helper_conn->connector->tile_v_loc != tile_pass - 1) 2008 /* if this tile_pass doesn't cover any of the tiles - keep going */ 2009 continue; 2010 2011 /* find the tile offsets for this pass - need 2012 to find all tiles left and above */ 2013 drm_get_tile_offsets(fb_helper, modes, offsets, 2014 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc); 2015 } 2016 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", 2017 fb_helper_conn->connector->base.id); 2018 2019 /* got for command line mode first */ 2020 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 2021 if (!modes[i]) { 2022 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n", 2023 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0); 2024 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); 2025 } 2026 /* No preferred modes, pick one off the list */ 2027 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { 2028 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) 2029 break; 2030 } 2031 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : 2032 "none"); 2033 conn_configured |= BIT_ULL(i); 2034 } 2035 2036 if ((conn_configured & mask) != mask) { 2037 tile_pass++; 2038 goto retry; 2039 } 2040 return true; 2041 } 2042 2043 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, 2044 struct drm_fb_helper_crtc **best_crtcs, 2045 struct drm_display_mode **modes, 2046 int n, int width, int height) 2047 { 2048 int c, o; 2049 struct drm_connector *connector; 2050 const struct drm_connector_helper_funcs *connector_funcs; 2051 struct drm_encoder *encoder; 2052 int my_score, best_score, score; 2053 struct drm_fb_helper_crtc **crtcs, *crtc; 2054 struct drm_fb_helper_connector *fb_helper_conn; 2055 2056 if (n == fb_helper->connector_count) 2057 return 0; 2058 2059 fb_helper_conn = fb_helper->connector_info[n]; 2060 connector = fb_helper_conn->connector; 2061 2062 best_crtcs[n] = NULL; 2063 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); 2064 if (modes[n] == NULL) 2065 return best_score; 2066 2067 crtcs = kzalloc(fb_helper->connector_count * 2068 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 2069 if (!crtcs) 2070 return best_score; 2071 2072 my_score = 1; 2073 if (connector->status == connector_status_connected) 2074 my_score++; 2075 if (drm_has_cmdline_mode(fb_helper_conn)) 2076 my_score++; 2077 if (drm_has_preferred_mode(fb_helper_conn, width, height)) 2078 my_score++; 2079 2080 connector_funcs = connector->helper_private; 2081 2082 /* 2083 * If the DRM device implements atomic hooks and ->best_encoder() is 2084 * NULL we fallback to the default drm_atomic_helper_best_encoder() 2085 * helper. 2086 */ 2087 if (fb_helper->dev->mode_config.funcs->atomic_commit && 2088 !connector_funcs->best_encoder) 2089 encoder = drm_atomic_helper_best_encoder(connector); 2090 else 2091 encoder = connector_funcs->best_encoder(connector); 2092 2093 if (!encoder) 2094 goto out; 2095 2096 /* select a crtc for this connector and then attempt to configure 2097 remaining connectors */ 2098 for (c = 0; c < fb_helper->crtc_count; c++) { 2099 crtc = &fb_helper->crtc_info[c]; 2100 2101 if ((encoder->possible_crtcs & (1 << c)) == 0) 2102 continue; 2103 2104 for (o = 0; o < n; o++) 2105 if (best_crtcs[o] == crtc) 2106 break; 2107 2108 if (o < n) { 2109 /* ignore cloning unless only a single crtc */ 2110 if (fb_helper->crtc_count > 1) 2111 continue; 2112 2113 if (!drm_mode_equal(modes[o], modes[n])) 2114 continue; 2115 } 2116 2117 crtcs[n] = crtc; 2118 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); 2119 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, 2120 width, height); 2121 if (score > best_score) { 2122 best_score = score; 2123 memcpy(best_crtcs, crtcs, 2124 fb_helper->connector_count * 2125 sizeof(struct drm_fb_helper_crtc *)); 2126 } 2127 } 2128 out: 2129 kfree(crtcs); 2130 return best_score; 2131 } 2132 2133 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper, 2134 u32 width, u32 height) 2135 { 2136 struct drm_device *dev = fb_helper->dev; 2137 struct drm_fb_helper_crtc **crtcs; 2138 struct drm_display_mode **modes; 2139 struct drm_fb_offset *offsets; 2140 bool *enabled; 2141 int i; 2142 2143 DRM_DEBUG_KMS("\n"); 2144 if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0) 2145 DRM_DEBUG_KMS("No connectors reported connected with modes\n"); 2146 2147 /* prevent concurrent modification of connector_count by hotplug */ 2148 lockdep_assert_held(&fb_helper->dev->mode_config.mutex); 2149 2150 crtcs = kcalloc(fb_helper->connector_count, 2151 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 2152 modes = kcalloc(fb_helper->connector_count, 2153 sizeof(struct drm_display_mode *), GFP_KERNEL); 2154 offsets = kcalloc(fb_helper->connector_count, 2155 sizeof(struct drm_fb_offset), GFP_KERNEL); 2156 enabled = kcalloc(fb_helper->connector_count, 2157 sizeof(bool), GFP_KERNEL); 2158 if (!crtcs || !modes || !enabled || !offsets) { 2159 DRM_ERROR("Memory allocation failed\n"); 2160 goto out; 2161 } 2162 2163 drm_enable_connectors(fb_helper, enabled); 2164 2165 if (!(fb_helper->funcs->initial_config && 2166 fb_helper->funcs->initial_config(fb_helper, crtcs, modes, 2167 offsets, 2168 enabled, width, height))) { 2169 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0])); 2170 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0])); 2171 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0])); 2172 2173 if (!drm_target_cloned(fb_helper, modes, offsets, 2174 enabled, width, height) && 2175 !drm_target_preferred(fb_helper, modes, offsets, 2176 enabled, width, height)) 2177 DRM_ERROR("Unable to find initial modes\n"); 2178 2179 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", 2180 width, height); 2181 2182 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); 2183 } 2184 2185 /* need to set the modesets up here for use later */ 2186 /* fill out the connector<->crtc mappings into the modesets */ 2187 for (i = 0; i < fb_helper->crtc_count; i++) 2188 drm_fb_helper_modeset_release(fb_helper, 2189 &fb_helper->crtc_info[i].mode_set); 2190 2191 drm_fb_helper_for_each_connector(fb_helper, i) { 2192 struct drm_display_mode *mode = modes[i]; 2193 struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; 2194 struct drm_fb_offset *offset = &offsets[i]; 2195 struct drm_mode_set *modeset = &fb_crtc->mode_set; 2196 2197 if (mode && fb_crtc) { 2198 struct drm_connector *connector = 2199 fb_helper->connector_info[i]->connector; 2200 2201 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n", 2202 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y); 2203 2204 fb_crtc->desired_mode = mode; 2205 fb_crtc->x = offset->x; 2206 fb_crtc->y = offset->y; 2207 modeset->mode = drm_mode_duplicate(dev, 2208 fb_crtc->desired_mode); 2209 drm_connector_reference(connector); 2210 modeset->connectors[modeset->num_connectors++] = connector; 2211 modeset->fb = fb_helper->fb; 2212 modeset->x = offset->x; 2213 modeset->y = offset->y; 2214 } 2215 } 2216 out: 2217 kfree(crtcs); 2218 kfree(modes); 2219 kfree(offsets); 2220 kfree(enabled); 2221 } 2222 2223 /** 2224 * drm_fb_helper_initial_config - setup a sane initial connector configuration 2225 * @fb_helper: fb_helper device struct 2226 * @bpp_sel: bpp value to use for the framebuffer configuration 2227 * 2228 * Scans the CRTCs and connectors and tries to put together an initial setup. 2229 * At the moment, this is a cloned configuration across all heads with 2230 * a new framebuffer object as the backing store. 2231 * 2232 * Note that this also registers the fbdev and so allows userspace to call into 2233 * the driver through the fbdev interfaces. 2234 * 2235 * This function will call down into the ->fb_probe callback to let 2236 * the driver allocate and initialize the fbdev info structure and the drm 2237 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and 2238 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default 2239 * values for the fbdev info structure. 2240 * 2241 * HANG DEBUGGING: 2242 * 2243 * When you have fbcon support built-in or already loaded, this function will do 2244 * a full modeset to setup the fbdev console. Due to locking misdesign in the 2245 * VT/fbdev subsystem that entire modeset sequence has to be done while holding 2246 * console_lock. Until console_unlock is called no dmesg lines will be sent out 2247 * to consoles, not even serial console. This means when your driver crashes, 2248 * you will see absolutely nothing else but a system stuck in this function, 2249 * with no further output. Any kind of printk() you place within your own driver 2250 * or in the drm core modeset code will also never show up. 2251 * 2252 * Standard debug practice is to run the fbcon setup without taking the 2253 * console_lock as a hack, to be able to see backtraces and crashes on the 2254 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel 2255 * cmdline option. 2256 * 2257 * The other option is to just disable fbdev emulation since very likely the 2258 * first modeset from userspace will crash in the same way, and is even easier 2259 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0 2260 * kernel cmdline option. 2261 * 2262 * RETURNS: 2263 * Zero if everything went ok, nonzero otherwise. 2264 */ 2265 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) 2266 { 2267 struct drm_device *dev = fb_helper->dev; 2268 struct fb_info *info; 2269 int ret; 2270 #ifdef __DragonFly__ 2271 int kms_console = 1; 2272 #endif 2273 2274 if (!drm_fbdev_emulation) 2275 return 0; 2276 2277 mutex_lock(&dev->mode_config.mutex); 2278 drm_setup_crtcs(fb_helper, 2279 dev->mode_config.max_width, 2280 dev->mode_config.max_height); 2281 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 2282 mutex_unlock(&dev->mode_config.mutex); 2283 if (ret) 2284 return ret; 2285 2286 info = fb_helper->fbdev; 2287 #ifdef __DragonFly__ 2288 TUNABLE_INT_FETCH("kern.kms_console", &kms_console); 2289 if (kms_console) { 2290 if (register_framebuffer(info) < 0) 2291 return -EINVAL; 2292 2293 mutex_lock(&kernel_fb_helper_lock); 2294 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 2295 mutex_unlock(&kernel_fb_helper_lock); 2296 } 2297 #else 2298 info->var.pixclock = 0; 2299 ret = register_framebuffer(info); 2300 if (ret < 0) 2301 return ret; 2302 2303 dev_info(dev->dev, "fb%d: %s frame buffer device\n", 2304 info->node, info->fix.id); 2305 2306 mutex_lock(&kernel_fb_helper_lock); 2307 if (list_empty(&kernel_fb_helper_list)) 2308 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 2309 2310 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 2311 mutex_unlock(&kernel_fb_helper_lock); 2312 #endif 2313 2314 return 0; 2315 } 2316 EXPORT_SYMBOL(drm_fb_helper_initial_config); 2317 2318 /** 2319 * drm_fb_helper_hotplug_event - respond to a hotplug notification by 2320 * probing all the outputs attached to the fb 2321 * @fb_helper: the drm_fb_helper 2322 * 2323 * Scan the connectors attached to the fb_helper and try to put together a 2324 * setup after notification of a change in output configuration. 2325 * 2326 * Called at runtime, takes the mode config locks to be able to check/change the 2327 * modeset configuration. Must be run from process context (which usually means 2328 * either the output polling work or a work item launched from the driver's 2329 * hotplug interrupt). 2330 * 2331 * Note that drivers may call this even before calling 2332 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows 2333 * for a race-free fbcon setup and will make sure that the fbdev emulation will 2334 * not miss any hotplug events. 2335 * 2336 * RETURNS: 2337 * 0 on success and a non-zero error code otherwise. 2338 */ 2339 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 2340 { 2341 struct drm_device *dev = fb_helper->dev; 2342 2343 if (!drm_fbdev_emulation) 2344 return 0; 2345 2346 mutex_lock(&dev->mode_config.mutex); 2347 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) { 2348 fb_helper->delayed_hotplug = true; 2349 mutex_unlock(&dev->mode_config.mutex); 2350 return 0; 2351 } 2352 DRM_DEBUG_KMS("\n"); 2353 2354 drm_setup_crtcs(fb_helper, fb_helper->fb->width, fb_helper->fb->height); 2355 2356 mutex_unlock(&dev->mode_config.mutex); 2357 2358 drm_fb_helper_set_par(fb_helper->fbdev); 2359 2360 return 0; 2361 } 2362 EXPORT_SYMBOL(drm_fb_helper_hotplug_event); 2363 2364 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) 2365 * but the module doesn't depend on any fb console symbols. At least 2366 * attempt to load fbcon to avoid leaving the system without a usable console. 2367 */ 2368 int __init drm_fb_helper_modinit(void) 2369 { 2370 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) 2371 const char *name = "fbcon"; 2372 struct module *fbcon; 2373 2374 mutex_lock(&module_mutex); 2375 fbcon = find_module(name); 2376 mutex_unlock(&module_mutex); 2377 2378 if (!fbcon) 2379 request_module_nowait(name); 2380 #endif 2381 return 0; 2382 } 2383 EXPORT_SYMBOL(drm_fb_helper_modinit); 2384