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 int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC; 52 module_param(drm_fbdev_overalloc, int, 0444); 53 MODULE_PARM_DESC(drm_fbdev_overalloc, 54 "Overallocation of the fbdev buffer (%) [default=" 55 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]"); 56 57 static LINUX_LIST_HEAD(kernel_fb_helper_list); 58 static DEFINE_MUTEX(kernel_fb_helper_lock); 59 60 /** 61 * DOC: fbdev helpers 62 * 63 * The fb helper functions are useful to provide an fbdev on top of a drm kernel 64 * mode setting driver. They can be used mostly independently from the crtc 65 * helper functions used by many drivers to implement the kernel mode setting 66 * interfaces. 67 * 68 * Initialization is done as a four-step process with drm_fb_helper_prepare(), 69 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and 70 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the 71 * default behaviour can override the third step with their own code. 72 * Teardown is done with drm_fb_helper_fini() after the fbdev device is 73 * unregisters using drm_fb_helper_unregister_fbi(). 74 * 75 * At runtime drivers should restore the fbdev console by calling 76 * drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose 77 * callback. They should also notify the fb helper code from updates to the 78 * output configuration by calling drm_fb_helper_hotplug_event(). For easier 79 * integration with the output polling code in drm_crtc_helper.c the modeset 80 * code provides a &drm_mode_config_funcs.output_poll_changed callback. 81 * 82 * All other functions exported by the fb helper library can be used to 83 * implement the fbdev driver interface by the driver. 84 * 85 * It is possible, though perhaps somewhat tricky, to implement race-free 86 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare() 87 * helper must be called first to initialize the minimum required to make 88 * hotplug detection work. Drivers also need to make sure to properly set up 89 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init() 90 * it is safe to enable interrupts and start processing hotplug events. At the 91 * same time, drivers should initialize all modeset objects such as CRTCs, 92 * encoders and connectors. To finish up the fbdev helper initialization, the 93 * drm_fb_helper_init() function is called. To probe for all attached displays 94 * and set up an initial configuration using the detected hardware, drivers 95 * should call drm_fb_helper_single_add_all_connectors() followed by 96 * drm_fb_helper_initial_config(). 97 * 98 * If &drm_framebuffer_funcs.dirty is set, the 99 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will 100 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right 101 * away. This worker then calls the dirty() function ensuring that it will 102 * always run in process context since the fb_*() function could be running in 103 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io 104 * callback it will also schedule dirty_work with the damage collected from the 105 * mmap page writes. 106 */ 107 108 #define drm_fb_helper_for_each_connector(fbh, i__) \ 109 for (({ lockdep_assert_held(&(fbh)->lock); }), \ 110 i__ = 0; i__ < (fbh)->connector_count; i__++) 111 112 static int __drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, 113 struct drm_connector *connector) 114 { 115 struct drm_fb_helper_connector *fb_conn; 116 struct drm_fb_helper_connector **temp; 117 unsigned int count; 118 119 if (!drm_fbdev_emulation) 120 return 0; 121 122 lockdep_assert_held(&fb_helper->lock); 123 124 count = fb_helper->connector_count + 1; 125 126 if (count > fb_helper->connector_info_alloc_count) { 127 size_t size = count * sizeof(fb_conn); 128 129 temp = krealloc(fb_helper->connector_info, size, M_DRM, 130 GFP_KERNEL); 131 if (!temp) 132 return -ENOMEM; 133 134 fb_helper->connector_info_alloc_count = count; 135 fb_helper->connector_info = temp; 136 } 137 138 fb_conn = kzalloc(sizeof(*fb_conn), GFP_KERNEL); 139 if (!fb_conn) 140 return -ENOMEM; 141 142 drm_connector_get(connector); 143 fb_conn->connector = connector; 144 fb_helper->connector_info[fb_helper->connector_count++] = fb_conn; 145 146 return 0; 147 } 148 149 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, 150 struct drm_connector *connector) 151 { 152 int err; 153 154 mutex_lock(&fb_helper->lock); 155 err = __drm_fb_helper_add_one_connector(fb_helper, connector); 156 mutex_unlock(&fb_helper->lock); 157 158 return err; 159 } 160 EXPORT_SYMBOL(drm_fb_helper_add_one_connector); 161 162 /** 163 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev 164 * emulation helper 165 * @fb_helper: fbdev initialized with drm_fb_helper_init 166 * 167 * This functions adds all the available connectors for use with the given 168 * fb_helper. This is a separate step to allow drivers to freely assign 169 * connectors to the fbdev, e.g. if some are reserved for special purposes or 170 * not adequate to be used for the fbcon. 171 * 172 * This function is protected against concurrent connector hotadds/removals 173 * using drm_fb_helper_add_one_connector() and 174 * drm_fb_helper_remove_one_connector(). 175 */ 176 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) 177 { 178 struct drm_device *dev = fb_helper->dev; 179 struct drm_connector *connector; 180 struct drm_connector_list_iter conn_iter; 181 int i, ret = 0; 182 183 if (!drm_fbdev_emulation) 184 return 0; 185 186 mutex_lock(&fb_helper->lock); 187 drm_connector_list_iter_begin(dev, &conn_iter); 188 drm_for_each_connector_iter(connector, &conn_iter) { 189 ret = __drm_fb_helper_add_one_connector(fb_helper, connector); 190 if (ret) 191 goto fail; 192 } 193 goto out; 194 195 fail: 196 drm_fb_helper_for_each_connector(fb_helper, i) { 197 struct drm_fb_helper_connector *fb_helper_connector = 198 fb_helper->connector_info[i]; 199 200 drm_connector_put(fb_helper_connector->connector); 201 202 kfree(fb_helper_connector); 203 fb_helper->connector_info[i] = NULL; 204 } 205 fb_helper->connector_count = 0; 206 out: 207 drm_connector_list_iter_end(&conn_iter); 208 mutex_unlock(&fb_helper->lock); 209 210 return ret; 211 } 212 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); 213 214 static int __drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 215 struct drm_connector *connector) 216 { 217 struct drm_fb_helper_connector *fb_helper_connector; 218 int i, j; 219 220 if (!drm_fbdev_emulation) 221 return 0; 222 223 lockdep_assert_held(&fb_helper->lock); 224 225 drm_fb_helper_for_each_connector(fb_helper, i) { 226 if (fb_helper->connector_info[i]->connector == connector) 227 break; 228 } 229 230 if (i == fb_helper->connector_count) 231 return -EINVAL; 232 fb_helper_connector = fb_helper->connector_info[i]; 233 drm_connector_put(fb_helper_connector->connector); 234 235 for (j = i + 1; j < fb_helper->connector_count; j++) 236 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j]; 237 238 fb_helper->connector_count--; 239 kfree(fb_helper_connector); 240 241 return 0; 242 } 243 244 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 245 struct drm_connector *connector) 246 { 247 int err; 248 249 mutex_lock(&fb_helper->lock); 250 err = __drm_fb_helper_remove_one_connector(fb_helper, connector); 251 mutex_unlock(&fb_helper->lock); 252 253 return err; 254 } 255 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector); 256 257 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc) 258 { 259 uint16_t *r_base, *g_base, *b_base; 260 261 if (crtc->funcs->gamma_set == NULL) 262 return; 263 264 r_base = crtc->gamma_store; 265 g_base = r_base + crtc->gamma_size; 266 b_base = g_base + crtc->gamma_size; 267 268 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 269 crtc->gamma_size, NULL); 270 } 271 272 /** 273 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter 274 * @info: fbdev registered by the helper 275 */ 276 int drm_fb_helper_debug_enter(struct fb_info *info) 277 { 278 struct drm_fb_helper *helper = info->par; 279 const struct drm_crtc_helper_funcs *funcs; 280 int i; 281 282 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 283 for (i = 0; i < helper->crtc_count; i++) { 284 struct drm_mode_set *mode_set = 285 &helper->crtc_info[i].mode_set; 286 287 if (!mode_set->crtc->enabled) 288 continue; 289 290 funcs = mode_set->crtc->helper_private; 291 if (funcs->mode_set_base_atomic == NULL) 292 continue; 293 294 if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev)) 295 continue; 296 297 funcs->mode_set_base_atomic(mode_set->crtc, 298 mode_set->fb, 299 mode_set->x, 300 mode_set->y, 301 ENTER_ATOMIC_MODE_SET); 302 } 303 } 304 305 return 0; 306 } 307 EXPORT_SYMBOL(drm_fb_helper_debug_enter); 308 309 /** 310 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave 311 * @info: fbdev registered by the helper 312 */ 313 int drm_fb_helper_debug_leave(struct fb_info *info) 314 { 315 struct drm_fb_helper *helper = info->par; 316 struct drm_crtc *crtc; 317 const struct drm_crtc_helper_funcs *funcs; 318 struct drm_framebuffer *fb; 319 int i; 320 321 for (i = 0; i < helper->crtc_count; i++) { 322 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; 323 324 crtc = mode_set->crtc; 325 if (drm_drv_uses_atomic_modeset(crtc->dev)) 326 continue; 327 328 funcs = crtc->helper_private; 329 fb = crtc->primary->fb; 330 331 if (!crtc->enabled) 332 continue; 333 334 if (!fb) { 335 DRM_ERROR("no fb to restore??\n"); 336 continue; 337 } 338 339 if (funcs->mode_set_base_atomic == NULL) 340 continue; 341 342 drm_fb_helper_restore_lut_atomic(mode_set->crtc); 343 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, 344 crtc->y, LEAVE_ATOMIC_MODE_SET); 345 } 346 347 return 0; 348 } 349 EXPORT_SYMBOL(drm_fb_helper_debug_leave); 350 351 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool active) 352 { 353 struct drm_device *dev = fb_helper->dev; 354 struct drm_plane *plane; 355 struct drm_atomic_state *state; 356 int i, ret; 357 unsigned int plane_mask; 358 struct drm_modeset_acquire_ctx ctx; 359 360 drm_modeset_acquire_init(&ctx, 0); 361 362 state = drm_atomic_state_alloc(dev); 363 if (!state) { 364 ret = -ENOMEM; 365 goto out_ctx; 366 } 367 368 state->acquire_ctx = &ctx; 369 retry: 370 plane_mask = 0; 371 drm_for_each_plane(plane, dev) { 372 struct drm_plane_state *plane_state; 373 374 plane_state = drm_atomic_get_plane_state(state, plane); 375 if (IS_ERR(plane_state)) { 376 ret = PTR_ERR(plane_state); 377 goto out_state; 378 } 379 380 plane_state->rotation = DRM_MODE_ROTATE_0; 381 382 plane->old_fb = plane->fb; 383 plane_mask |= 1 << drm_plane_index(plane); 384 385 /* disable non-primary: */ 386 if (plane->type == DRM_PLANE_TYPE_PRIMARY) 387 continue; 388 389 ret = __drm_atomic_helper_disable_plane(plane, plane_state); 390 if (ret != 0) 391 goto out_state; 392 } 393 394 for (i = 0; i < fb_helper->crtc_count; i++) { 395 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 396 397 ret = __drm_atomic_helper_set_config(mode_set, state); 398 if (ret != 0) 399 goto out_state; 400 401 /* 402 * __drm_atomic_helper_set_config() sets active when a 403 * mode is set, unconditionally clear it if we force DPMS off 404 */ 405 if (!active) { 406 struct drm_crtc *crtc = mode_set->crtc; 407 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 408 409 crtc_state->active = false; 410 } 411 } 412 413 ret = drm_atomic_commit(state); 414 415 out_state: 416 drm_atomic_clean_old_fb(dev, plane_mask, ret); 417 418 if (ret == -EDEADLK) 419 goto backoff; 420 421 drm_atomic_state_put(state); 422 out_ctx: 423 drm_modeset_drop_locks(&ctx); 424 drm_modeset_acquire_fini(&ctx); 425 426 return ret; 427 428 backoff: 429 drm_atomic_state_clear(state); 430 drm_modeset_backoff(&ctx); 431 432 goto retry; 433 } 434 435 static int restore_fbdev_mode_legacy(struct drm_fb_helper *fb_helper) 436 { 437 struct drm_device *dev = fb_helper->dev; 438 struct drm_plane *plane; 439 int i, ret = 0; 440 441 drm_modeset_lock_all(fb_helper->dev); 442 drm_for_each_plane(plane, dev) { 443 if (plane->type != DRM_PLANE_TYPE_PRIMARY) 444 drm_plane_force_disable(plane); 445 446 if (plane->rotation_property) 447 drm_mode_plane_set_obj_prop(plane, 448 plane->rotation_property, 449 DRM_MODE_ROTATE_0); 450 } 451 452 for (i = 0; i < fb_helper->crtc_count; i++) { 453 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 454 struct drm_crtc *crtc = mode_set->crtc; 455 456 if (crtc->funcs->cursor_set2) { 457 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0); 458 if (ret) 459 goto out; 460 } else if (crtc->funcs->cursor_set) { 461 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0); 462 if (ret) 463 goto out; 464 } 465 466 ret = drm_mode_set_config_internal(mode_set); 467 if (ret) 468 goto out; 469 } 470 out: 471 drm_modeset_unlock_all(fb_helper->dev); 472 473 return ret; 474 } 475 476 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper) 477 { 478 struct drm_device *dev = fb_helper->dev; 479 480 if (drm_drv_uses_atomic_modeset(dev)) 481 return restore_fbdev_mode_atomic(fb_helper, true); 482 else 483 return restore_fbdev_mode_legacy(fb_helper); 484 } 485 486 /** 487 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration 488 * @fb_helper: fbcon to restore 489 * 490 * This should be called from driver's drm &drm_driver.lastclose callback 491 * when implementing an fbcon on top of kms using this helper. This ensures that 492 * the user isn't greeted with a black screen when e.g. X dies. 493 * 494 * RETURNS: 495 * Zero if everything went ok, negative error code otherwise. 496 */ 497 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) 498 { 499 bool do_delayed; 500 int ret; 501 502 if (!drm_fbdev_emulation) 503 return -ENODEV; 504 505 if (READ_ONCE(fb_helper->deferred_setup)) 506 return 0; 507 508 mutex_lock(&fb_helper->lock); 509 ret = restore_fbdev_mode(fb_helper); 510 511 do_delayed = fb_helper->delayed_hotplug; 512 if (do_delayed) 513 fb_helper->delayed_hotplug = false; 514 mutex_unlock(&fb_helper->lock); 515 516 if (do_delayed) 517 drm_fb_helper_hotplug_event(fb_helper); 518 519 return ret; 520 } 521 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked); 522 523 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper) 524 { 525 struct drm_device *dev = fb_helper->dev; 526 struct drm_crtc *crtc; 527 int bound = 0, crtcs_bound = 0; 528 529 /* 530 * Sometimes user space wants everything disabled, so don't steal the 531 * display if there's a master. 532 */ 533 if (READ_ONCE(dev->master)) 534 return false; 535 536 drm_for_each_crtc(crtc, dev) { 537 drm_modeset_lock(&crtc->mutex, NULL); 538 if (crtc->primary->fb) 539 crtcs_bound++; 540 if (crtc->primary->fb == fb_helper->fb) 541 bound++; 542 drm_modeset_unlock(&crtc->mutex); 543 } 544 545 if (bound < crtcs_bound) 546 return false; 547 548 return true; 549 } 550 551 #ifdef CONFIG_MAGIC_SYSRQ 552 /* 553 * restore fbcon display for all kms driver's using this helper, used for sysrq 554 * and panic handling. 555 */ 556 static bool drm_fb_helper_force_kernel_mode(void) 557 { 558 bool ret, error = false; 559 struct drm_fb_helper *helper; 560 561 if (list_empty(&kernel_fb_helper_list)) 562 return false; 563 564 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 565 struct drm_device *dev = helper->dev; 566 567 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) 568 continue; 569 570 mutex_lock(&helper->lock); 571 ret = restore_fbdev_mode(helper); 572 if (ret) 573 error = true; 574 mutex_unlock(&helper->lock); 575 } 576 return error; 577 } 578 579 #if 0 580 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) 581 { 582 bool ret; 583 584 ret = drm_fb_helper_force_kernel_mode(); 585 if (ret == true) 586 DRM_ERROR("Failed to restore crtc configuration\n"); 587 } 588 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); 589 590 static void drm_fb_helper_sysrq(int dummy1) 591 { 592 schedule_work(&drm_fb_helper_restore_work); 593 } 594 595 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { 596 .handler = drm_fb_helper_sysrq, 597 .help_msg = "force-fb(V)", 598 .action_msg = "Restore framebuffer console", 599 }; 600 #else 601 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; 602 #endif 603 #endif 604 605 static void dpms_legacy(struct drm_fb_helper *fb_helper, int dpms_mode) 606 { 607 struct drm_device *dev = fb_helper->dev; 608 struct drm_crtc *crtc; 609 struct drm_connector *connector; 610 int i, j; 611 612 drm_modeset_lock_all(dev); 613 for (i = 0; i < fb_helper->crtc_count; i++) { 614 crtc = fb_helper->crtc_info[i].mode_set.crtc; 615 616 if (!crtc->enabled) 617 continue; 618 619 /* Walk the connectors & encoders on this fb turning them on/off */ 620 drm_fb_helper_for_each_connector(fb_helper, j) { 621 connector = fb_helper->connector_info[j]->connector; 622 connector->funcs->dpms(connector, dpms_mode); 623 drm_object_property_set_value(&connector->base, 624 dev->mode_config.dpms_property, dpms_mode); 625 } 626 } 627 drm_modeset_unlock_all(dev); 628 } 629 630 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) 631 { 632 struct drm_fb_helper *fb_helper = info->par; 633 634 /* 635 * For each CRTC in this fb, turn the connectors on/off. 636 */ 637 mutex_lock(&fb_helper->lock); 638 if (!drm_fb_helper_is_bound(fb_helper)) { 639 mutex_unlock(&fb_helper->lock); 640 return; 641 } 642 643 if (drm_drv_uses_atomic_modeset(fb_helper->dev)) 644 restore_fbdev_mode_atomic(fb_helper, dpms_mode == DRM_MODE_DPMS_ON); 645 else 646 dpms_legacy(fb_helper, dpms_mode); 647 mutex_unlock(&fb_helper->lock); 648 } 649 650 /** 651 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank 652 * @blank: desired blanking state 653 * @info: fbdev registered by the helper 654 */ 655 int drm_fb_helper_blank(int blank, struct fb_info *info) 656 { 657 if (oops_in_progress) 658 return -EBUSY; 659 660 switch (blank) { 661 /* Display: On; HSync: On, VSync: On */ 662 case FB_BLANK_UNBLANK: 663 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); 664 break; 665 #if 0 666 /* Display: Off; HSync: On, VSync: On */ 667 case FB_BLANK_NORMAL: 668 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 669 break; 670 /* Display: Off; HSync: Off, VSync: On */ 671 case FB_BLANK_HSYNC_SUSPEND: 672 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 673 break; 674 /* Display: Off; HSync: On, VSync: Off */ 675 case FB_BLANK_VSYNC_SUSPEND: 676 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); 677 break; 678 #endif 679 /* Display: Off; HSync: Off, VSync: Off */ 680 case FB_BLANK_POWERDOWN: 681 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); 682 break; 683 } 684 return 0; 685 } 686 EXPORT_SYMBOL(drm_fb_helper_blank); 687 688 static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper, 689 struct drm_mode_set *modeset) 690 { 691 int i; 692 693 for (i = 0; i < modeset->num_connectors; i++) { 694 drm_connector_put(modeset->connectors[i]); 695 modeset->connectors[i] = NULL; 696 } 697 modeset->num_connectors = 0; 698 699 drm_mode_destroy(helper->dev, modeset->mode); 700 modeset->mode = NULL; 701 702 /* FIXME should hold a ref? */ 703 modeset->fb = NULL; 704 } 705 706 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) 707 { 708 int i; 709 710 for (i = 0; i < helper->connector_count; i++) { 711 drm_connector_put(helper->connector_info[i]->connector); 712 kfree(helper->connector_info[i]); 713 } 714 kfree(helper->connector_info); 715 716 for (i = 0; i < helper->crtc_count; i++) { 717 struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set; 718 719 drm_fb_helper_modeset_release(helper, modeset); 720 kfree(modeset->connectors); 721 } 722 kfree(helper->crtc_info); 723 } 724 725 static void drm_fb_helper_resume_worker(struct work_struct *work) 726 { 727 #if 0 728 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, 729 resume_work); 730 731 console_lock(); 732 fb_set_suspend(helper->fbdev, 0); 733 console_unlock(); 734 #endif 735 } 736 737 static void drm_fb_helper_dirty_work(struct work_struct *work) 738 { 739 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, 740 dirty_work); 741 struct drm_clip_rect *clip = &helper->dirty_clip; 742 struct drm_clip_rect clip_copy; 743 unsigned long flags; 744 745 spin_lock_irqsave(&helper->dirty_lock, flags); 746 clip_copy = *clip; 747 clip->x1 = clip->y1 = ~0; 748 clip->x2 = clip->y2 = 0; 749 spin_unlock_irqrestore(&helper->dirty_lock, flags); 750 751 /* call dirty callback only when it has been really touched */ 752 if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) 753 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); 754 } 755 756 /** 757 * drm_fb_helper_prepare - setup a drm_fb_helper structure 758 * @dev: DRM device 759 * @helper: driver-allocated fbdev helper structure to set up 760 * @funcs: pointer to structure of functions associate with this helper 761 * 762 * Sets up the bare minimum to make the framebuffer helper usable. This is 763 * useful to implement race-free initialization of the polling helpers. 764 */ 765 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, 766 const struct drm_fb_helper_funcs *funcs) 767 { 768 INIT_LIST_HEAD(&helper->kernel_fb_list); 769 lockinit(&helper->dirty_lock, "drm_fb_helper dirty_lock", 0, 0); 770 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker); 771 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); 772 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0; 773 lockinit(&helper->lock, "dfbhl", 0, LK_CANRECURSE); 774 helper->funcs = funcs; 775 helper->dev = dev; 776 } 777 EXPORT_SYMBOL(drm_fb_helper_prepare); 778 779 /** 780 * drm_fb_helper_init - initialize a &struct drm_fb_helper 781 * @dev: drm device 782 * @fb_helper: driver-allocated fbdev helper structure to initialize 783 * @max_conn_count: max connector count 784 * 785 * This allocates the structures for the fbdev helper with the given limits. 786 * Note that this won't yet touch the hardware (through the driver interfaces) 787 * nor register the fbdev. This is only done in drm_fb_helper_initial_config() 788 * to allow driver writes more control over the exact init sequence. 789 * 790 * Drivers must call drm_fb_helper_prepare() before calling this function. 791 * 792 * RETURNS: 793 * Zero if everything went ok, nonzero otherwise. 794 */ 795 int drm_fb_helper_init(struct drm_device *dev, 796 struct drm_fb_helper *fb_helper, 797 int max_conn_count) 798 { 799 struct drm_crtc *crtc; 800 struct drm_mode_config *config = &dev->mode_config; 801 int i; 802 803 if (!drm_fbdev_emulation) 804 return 0; 805 806 if (!max_conn_count) 807 return -EINVAL; 808 809 fb_helper->crtc_info = kcalloc(config->num_crtc, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); 810 if (!fb_helper->crtc_info) 811 return -ENOMEM; 812 813 fb_helper->crtc_count = config->num_crtc; 814 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); 815 if (!fb_helper->connector_info) { 816 kfree(fb_helper->crtc_info); 817 return -ENOMEM; 818 } 819 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector; 820 fb_helper->connector_count = 0; 821 822 for (i = 0; i < fb_helper->crtc_count; i++) { 823 fb_helper->crtc_info[i].mode_set.connectors = 824 kcalloc(max_conn_count, 825 sizeof(struct drm_connector *), 826 GFP_KERNEL); 827 828 if (!fb_helper->crtc_info[i].mode_set.connectors) 829 goto out_free; 830 fb_helper->crtc_info[i].mode_set.num_connectors = 0; 831 } 832 833 i = 0; 834 drm_for_each_crtc(crtc, dev) { 835 fb_helper->crtc_info[i].mode_set.crtc = crtc; 836 i++; 837 } 838 839 return 0; 840 out_free: 841 drm_fb_helper_crtc_free(fb_helper); 842 return -ENOMEM; 843 } 844 EXPORT_SYMBOL(drm_fb_helper_init); 845 846 /** 847 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members 848 * @fb_helper: driver-allocated fbdev helper 849 * 850 * A helper to alloc fb_info and the members cmap and apertures. Called 851 * by the driver within the fb_probe fb_helper callback function. Drivers do not 852 * need to release the allocated fb_info structure themselves, this is 853 * automatically done when calling drm_fb_helper_fini(). 854 * 855 * RETURNS: 856 * fb_info pointer if things went okay, pointer containing error code 857 * otherwise 858 */ 859 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) 860 { 861 struct device *dev = fb_helper->dev->dev; 862 struct fb_info *info; 863 #if 0 864 int ret; 865 #endif 866 867 info = framebuffer_alloc(0, dev); 868 if (!info) 869 return ERR_PTR(-ENOMEM); 870 871 #if 0 872 ret = fb_alloc_cmap(&info->cmap, 256, 0); 873 if (ret) 874 goto err_release; 875 876 info->apertures = alloc_apertures(1); 877 if (!info->apertures) { 878 ret = -ENOMEM; 879 goto err_free_cmap; 880 } 881 #endif 882 883 fb_helper->fbdev = info; 884 885 return info; 886 887 #if 0 888 err_free_cmap: 889 fb_dealloc_cmap(&info->cmap); 890 err_release: 891 framebuffer_release(info); 892 return ERR_PTR(ret); 893 #endif 894 } 895 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi); 896 897 /** 898 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device 899 * @fb_helper: driver-allocated fbdev helper 900 * 901 * A wrapper around unregister_framebuffer, to release the fb_info 902 * framebuffer device. This must be called before releasing all resources for 903 * @fb_helper by calling drm_fb_helper_fini(). 904 */ 905 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) 906 { 907 if (fb_helper && fb_helper->fbdev) 908 unregister_framebuffer(fb_helper->fbdev); 909 } 910 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi); 911 912 /** 913 * drm_fb_helper_fini - finialize a &struct drm_fb_helper 914 * @fb_helper: driver-allocated fbdev helper 915 * 916 * This cleans up all remaining resources associated with @fb_helper. Must be 917 * called after drm_fb_helper_unlink_fbi() was called. 918 */ 919 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) 920 { 921 struct fb_info *info; 922 923 if (!drm_fbdev_emulation || !fb_helper) 924 return; 925 926 cancel_work_sync(&fb_helper->resume_work); 927 cancel_work_sync(&fb_helper->dirty_work); 928 929 info = fb_helper->fbdev; 930 if (info) { 931 #if 0 932 if (info->cmap.len) 933 fb_dealloc_cmap(&info->cmap); 934 #endif 935 framebuffer_release(info); 936 } 937 fb_helper->fbdev = NULL; 938 939 mutex_lock(&kernel_fb_helper_lock); 940 if (!list_empty(&fb_helper->kernel_fb_list)) { 941 list_del(&fb_helper->kernel_fb_list); 942 #if 0 943 if (list_empty(&kernel_fb_helper_list)) 944 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 945 #endif 946 } 947 mutex_unlock(&kernel_fb_helper_lock); 948 949 mutex_destroy(&fb_helper->lock); 950 drm_fb_helper_crtc_free(fb_helper); 951 952 } 953 EXPORT_SYMBOL(drm_fb_helper_fini); 954 955 #if 0 956 /** 957 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer 958 * @fb_helper: driver-allocated fbdev helper 959 * 960 * A wrapper around unlink_framebuffer implemented by fbdev core 961 */ 962 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) 963 { 964 if (fb_helper && fb_helper->fbdev) 965 unlink_framebuffer(fb_helper->fbdev); 966 } 967 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); 968 969 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, 970 u32 width, u32 height) 971 { 972 struct drm_fb_helper *helper = info->par; 973 struct drm_clip_rect *clip = &helper->dirty_clip; 974 unsigned long flags; 975 976 if (!helper->fb->funcs->dirty) 977 return; 978 979 spin_lock_irqsave(&helper->dirty_lock, flags); 980 clip->x1 = min_t(u32, clip->x1, x); 981 clip->y1 = min_t(u32, clip->y1, y); 982 clip->x2 = max_t(u32, clip->x2, x + width); 983 clip->y2 = max_t(u32, clip->y2, y + height); 984 spin_unlock_irqrestore(&helper->dirty_lock, flags); 985 986 schedule_work(&helper->dirty_work); 987 } 988 989 /** 990 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function 991 * @info: fb_info struct pointer 992 * @pagelist: list of dirty mmap framebuffer pages 993 * 994 * This function is used as the &fb_deferred_io.deferred_io 995 * callback function for flushing the fbdev mmap writes. 996 */ 997 void drm_fb_helper_deferred_io(struct fb_info *info, 998 struct list_head *pagelist) 999 { 1000 unsigned long start, end, min, max; 1001 struct page *page; 1002 u32 y1, y2; 1003 1004 min = ULONG_MAX; 1005 max = 0; 1006 list_for_each_entry(page, pagelist, lru) { 1007 start = page->index << PAGE_SHIFT; 1008 end = start + PAGE_SIZE - 1; 1009 min = min(min, start); 1010 max = max(max, end); 1011 } 1012 1013 if (min < max) { 1014 y1 = min / info->fix.line_length; 1015 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length), 1016 info->var.yres); 1017 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); 1018 } 1019 } 1020 EXPORT_SYMBOL(drm_fb_helper_deferred_io); 1021 1022 /** 1023 * drm_fb_helper_sys_read - wrapper around fb_sys_read 1024 * @info: fb_info struct pointer 1025 * @buf: userspace buffer to read from framebuffer memory 1026 * @count: number of bytes to read from framebuffer memory 1027 * @ppos: read offset within framebuffer memory 1028 * 1029 * A wrapper around fb_sys_read implemented by fbdev core 1030 */ 1031 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, 1032 size_t count, loff_t *ppos) 1033 { 1034 return fb_sys_read(info, buf, count, ppos); 1035 } 1036 EXPORT_SYMBOL(drm_fb_helper_sys_read); 1037 1038 /** 1039 * drm_fb_helper_sys_write - wrapper around fb_sys_write 1040 * @info: fb_info struct pointer 1041 * @buf: userspace buffer to write to framebuffer memory 1042 * @count: number of bytes to write to framebuffer memory 1043 * @ppos: write offset within framebuffer memory 1044 * 1045 * A wrapper around fb_sys_write implemented by fbdev core 1046 */ 1047 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, 1048 size_t count, loff_t *ppos) 1049 { 1050 ssize_t ret; 1051 1052 ret = fb_sys_write(info, buf, count, ppos); 1053 if (ret > 0) 1054 drm_fb_helper_dirty(info, 0, 0, info->var.xres, 1055 info->var.yres); 1056 1057 return ret; 1058 } 1059 EXPORT_SYMBOL(drm_fb_helper_sys_write); 1060 1061 /** 1062 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect 1063 * @info: fbdev registered by the helper 1064 * @rect: info about rectangle to fill 1065 * 1066 * A wrapper around sys_fillrect implemented by fbdev core 1067 */ 1068 void drm_fb_helper_sys_fillrect(struct fb_info *info, 1069 const struct fb_fillrect *rect) 1070 { 1071 sys_fillrect(info, rect); 1072 drm_fb_helper_dirty(info, rect->dx, rect->dy, 1073 rect->width, rect->height); 1074 } 1075 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); 1076 1077 /** 1078 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea 1079 * @info: fbdev registered by the helper 1080 * @area: info about area to copy 1081 * 1082 * A wrapper around sys_copyarea implemented by fbdev core 1083 */ 1084 void drm_fb_helper_sys_copyarea(struct fb_info *info, 1085 const struct fb_copyarea *area) 1086 { 1087 sys_copyarea(info, area); 1088 drm_fb_helper_dirty(info, area->dx, area->dy, 1089 area->width, area->height); 1090 } 1091 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); 1092 1093 /** 1094 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit 1095 * @info: fbdev registered by the helper 1096 * @image: info about image to blit 1097 * 1098 * A wrapper around sys_imageblit implemented by fbdev core 1099 */ 1100 void drm_fb_helper_sys_imageblit(struct fb_info *info, 1101 const struct fb_image *image) 1102 { 1103 sys_imageblit(info, image); 1104 drm_fb_helper_dirty(info, image->dx, image->dy, 1105 image->width, image->height); 1106 } 1107 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); 1108 1109 /** 1110 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect 1111 * @info: fbdev registered by the helper 1112 * @rect: info about rectangle to fill 1113 * 1114 * A wrapper around cfb_imageblit implemented by fbdev core 1115 */ 1116 void drm_fb_helper_cfb_fillrect(struct fb_info *info, 1117 const struct fb_fillrect *rect) 1118 { 1119 cfb_fillrect(info, rect); 1120 drm_fb_helper_dirty(info, rect->dx, rect->dy, 1121 rect->width, rect->height); 1122 } 1123 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); 1124 1125 /** 1126 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea 1127 * @info: fbdev registered by the helper 1128 * @area: info about area to copy 1129 * 1130 * A wrapper around cfb_copyarea implemented by fbdev core 1131 */ 1132 void drm_fb_helper_cfb_copyarea(struct fb_info *info, 1133 const struct fb_copyarea *area) 1134 { 1135 cfb_copyarea(info, area); 1136 drm_fb_helper_dirty(info, area->dx, area->dy, 1137 area->width, area->height); 1138 } 1139 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); 1140 1141 /** 1142 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit 1143 * @info: fbdev registered by the helper 1144 * @image: info about image to blit 1145 * 1146 * A wrapper around cfb_imageblit implemented by fbdev core 1147 */ 1148 void drm_fb_helper_cfb_imageblit(struct fb_info *info, 1149 const struct fb_image *image) 1150 { 1151 cfb_imageblit(info, image); 1152 drm_fb_helper_dirty(info, image->dx, image->dy, 1153 image->width, image->height); 1154 } 1155 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); 1156 1157 /** 1158 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend 1159 * @fb_helper: driver-allocated fbdev helper 1160 * @suspend: whether to suspend or resume 1161 * 1162 * A wrapper around fb_set_suspend implemented by fbdev core. 1163 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take 1164 * the lock yourself 1165 */ 1166 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend) 1167 { 1168 if (fb_helper && fb_helper->fbdev) 1169 fb_set_suspend(fb_helper->fbdev, suspend); 1170 } 1171 EXPORT_SYMBOL(drm_fb_helper_set_suspend); 1172 1173 /** 1174 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also 1175 * takes the console lock 1176 * @fb_helper: driver-allocated fbdev helper 1177 * @suspend: whether to suspend or resume 1178 * 1179 * A wrapper around fb_set_suspend() that takes the console lock. If the lock 1180 * isn't available on resume, a worker is tasked with waiting for the lock 1181 * to become available. The console lock can be pretty contented on resume 1182 * due to all the printk activity. 1183 * 1184 * This function can be called multiple times with the same state since 1185 * &fb_info.state is checked to see if fbdev is running or not before locking. 1186 * 1187 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself. 1188 */ 1189 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, 1190 bool suspend) 1191 { 1192 if (!fb_helper || !fb_helper->fbdev) 1193 return; 1194 1195 /* make sure there's no pending/ongoing resume */ 1196 flush_work(&fb_helper->resume_work); 1197 1198 if (suspend) { 1199 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING) 1200 return; 1201 1202 console_lock(); 1203 1204 } else { 1205 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING) 1206 return; 1207 1208 if (!console_trylock()) { 1209 schedule_work(&fb_helper->resume_work); 1210 return; 1211 } 1212 } 1213 1214 fb_set_suspend(fb_helper->fbdev, suspend); 1215 console_unlock(); 1216 } 1217 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked); 1218 1219 static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info) 1220 { 1221 u32 *palette = (u32 *)info->pseudo_palette; 1222 int i; 1223 1224 if (cmap->start + cmap->len > 16) 1225 return -EINVAL; 1226 1227 for (i = 0; i < cmap->len; ++i) { 1228 u16 red = cmap->red[i]; 1229 u16 green = cmap->green[i]; 1230 u16 blue = cmap->blue[i]; 1231 u32 value; 1232 1233 red >>= 16 - info->var.red.length; 1234 green >>= 16 - info->var.green.length; 1235 blue >>= 16 - info->var.blue.length; 1236 value = (red << info->var.red.offset) | 1237 (green << info->var.green.offset) | 1238 (blue << info->var.blue.offset); 1239 if (info->var.transp.length > 0) { 1240 u32 mask = (1 << info->var.transp.length) - 1; 1241 1242 mask <<= info->var.transp.offset; 1243 value |= mask; 1244 } 1245 palette[cmap->start + i] = value; 1246 } 1247 1248 return 0; 1249 } 1250 1251 static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info) 1252 { 1253 struct drm_fb_helper *fb_helper = info->par; 1254 struct drm_crtc *crtc; 1255 u16 *r, *g, *b; 1256 int i, ret = 0; 1257 1258 drm_modeset_lock_all(fb_helper->dev); 1259 for (i = 0; i < fb_helper->crtc_count; i++) { 1260 crtc = fb_helper->crtc_info[i].mode_set.crtc; 1261 if (!crtc->funcs->gamma_set || !crtc->gamma_size) 1262 return -EINVAL; 1263 1264 if (cmap->start + cmap->len > crtc->gamma_size) 1265 return -EINVAL; 1266 1267 r = crtc->gamma_store; 1268 g = r + crtc->gamma_size; 1269 b = g + crtc->gamma_size; 1270 1271 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r)); 1272 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g)); 1273 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b)); 1274 1275 ret = crtc->funcs->gamma_set(crtc, r, g, b, 1276 crtc->gamma_size, NULL); 1277 if (ret) 1278 return ret; 1279 } 1280 drm_modeset_unlock_all(fb_helper->dev); 1281 1282 return ret; 1283 } 1284 1285 static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc, 1286 struct fb_cmap *cmap) 1287 { 1288 struct drm_device *dev = crtc->dev; 1289 struct drm_property_blob *gamma_lut; 1290 struct drm_color_lut *lut; 1291 int size = crtc->gamma_size; 1292 int i; 1293 1294 if (!size || cmap->start + cmap->len > size) 1295 return ERR_PTR(-EINVAL); 1296 1297 gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL); 1298 if (IS_ERR(gamma_lut)) 1299 return gamma_lut; 1300 1301 lut = (struct drm_color_lut *)gamma_lut->data; 1302 if (cmap->start || cmap->len != size) { 1303 u16 *r = crtc->gamma_store; 1304 u16 *g = r + crtc->gamma_size; 1305 u16 *b = g + crtc->gamma_size; 1306 1307 for (i = 0; i < cmap->start; i++) { 1308 lut[i].red = r[i]; 1309 lut[i].green = g[i]; 1310 lut[i].blue = b[i]; 1311 } 1312 for (i = cmap->start + cmap->len; i < size; i++) { 1313 lut[i].red = r[i]; 1314 lut[i].green = g[i]; 1315 lut[i].blue = b[i]; 1316 } 1317 } 1318 1319 for (i = 0; i < cmap->len; i++) { 1320 lut[cmap->start + i].red = cmap->red[i]; 1321 lut[cmap->start + i].green = cmap->green[i]; 1322 lut[cmap->start + i].blue = cmap->blue[i]; 1323 } 1324 1325 return gamma_lut; 1326 } 1327 1328 static int setcmap_atomic(struct fb_cmap *cmap, 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_property_blob *gamma_lut = NULL; 1333 struct drm_modeset_acquire_ctx ctx; 1334 struct drm_crtc_state *crtc_state; 1335 struct drm_atomic_state *state; 1336 struct drm_crtc *crtc; 1337 u16 *r, *g, *b; 1338 int i, ret = 0; 1339 bool replaced; 1340 1341 drm_modeset_acquire_init(&ctx, 0); 1342 1343 state = drm_atomic_state_alloc(dev); 1344 if (!state) { 1345 ret = -ENOMEM; 1346 goto out_ctx; 1347 } 1348 1349 state->acquire_ctx = &ctx; 1350 retry: 1351 for (i = 0; i < fb_helper->crtc_count; i++) { 1352 crtc = fb_helper->crtc_info[i].mode_set.crtc; 1353 1354 if (!gamma_lut) 1355 gamma_lut = setcmap_new_gamma_lut(crtc, cmap); 1356 if (IS_ERR(gamma_lut)) { 1357 ret = PTR_ERR(gamma_lut); 1358 gamma_lut = NULL; 1359 goto out_state; 1360 } 1361 1362 crtc_state = drm_atomic_get_crtc_state(state, crtc); 1363 if (IS_ERR(crtc_state)) { 1364 ret = PTR_ERR(crtc_state); 1365 goto out_state; 1366 } 1367 1368 replaced = drm_property_replace_blob(&crtc_state->degamma_lut, 1369 NULL); 1370 replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL); 1371 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut, 1372 gamma_lut); 1373 crtc_state->color_mgmt_changed |= replaced; 1374 } 1375 1376 ret = drm_atomic_commit(state); 1377 if (ret) 1378 goto out_state; 1379 1380 for (i = 0; i < fb_helper->crtc_count; i++) { 1381 crtc = fb_helper->crtc_info[i].mode_set.crtc; 1382 1383 r = crtc->gamma_store; 1384 g = r + crtc->gamma_size; 1385 b = g + crtc->gamma_size; 1386 1387 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r)); 1388 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g)); 1389 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b)); 1390 } 1391 1392 out_state: 1393 if (ret == -EDEADLK) 1394 goto backoff; 1395 1396 drm_property_blob_put(gamma_lut); 1397 drm_atomic_state_put(state); 1398 out_ctx: 1399 drm_modeset_drop_locks(&ctx); 1400 drm_modeset_acquire_fini(&ctx); 1401 1402 return ret; 1403 1404 backoff: 1405 drm_atomic_state_clear(state); 1406 drm_modeset_backoff(&ctx); 1407 goto retry; 1408 } 1409 #endif 1410 1411 /** 1412 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap 1413 * @cmap: cmap to set 1414 * @info: fbdev registered by the helper 1415 */ 1416 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) 1417 { 1418 #if 0 1419 struct drm_fb_helper *fb_helper = info->par; 1420 int ret; 1421 1422 if (oops_in_progress) 1423 return -EBUSY; 1424 1425 mutex_lock(&fb_helper->lock); 1426 1427 if (!drm_fb_helper_is_bound(fb_helper)) { 1428 ret = -EBUSY; 1429 goto out; 1430 } 1431 1432 if (info->fix.visual == FB_VISUAL_TRUECOLOR) 1433 ret = setcmap_pseudo_palette(cmap, info); 1434 else if (drm_drv_uses_atomic_modeset(fb_helper->dev)) 1435 ret = setcmap_atomic(cmap, info); 1436 else 1437 ret = setcmap_legacy(cmap, info); 1438 1439 out: 1440 mutex_unlock(&fb_helper->lock); 1441 1442 return ret; 1443 #endif 1444 return 0; 1445 } 1446 EXPORT_SYMBOL(drm_fb_helper_setcmap); 1447 1448 /** 1449 * drm_fb_helper_ioctl - legacy ioctl implementation 1450 * @info: fbdev registered by the helper 1451 * @cmd: ioctl command 1452 * @arg: ioctl argument 1453 * 1454 * A helper to implement the standard fbdev ioctl. Only 1455 * FBIO_WAITFORVSYNC is implemented for now. 1456 */ 1457 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, 1458 unsigned long arg) 1459 { 1460 struct drm_fb_helper *fb_helper = info->par; 1461 #if 0 1462 struct drm_mode_set *mode_set; 1463 struct drm_crtc *crtc; 1464 #endif 1465 int ret = 0; 1466 1467 mutex_lock(&fb_helper->lock); 1468 if (!drm_fb_helper_is_bound(fb_helper)) { 1469 ret = -EBUSY; 1470 goto unlock; 1471 } 1472 1473 switch (cmd) { 1474 #if 0 1475 case FBIO_WAITFORVSYNC: 1476 /* 1477 * Only consider the first CRTC. 1478 * 1479 * This ioctl is supposed to take the CRTC number as 1480 * an argument, but in fbdev times, what that number 1481 * was supposed to be was quite unclear, different 1482 * drivers were passing that argument differently 1483 * (some by reference, some by value), and most of the 1484 * userspace applications were just hardcoding 0 as an 1485 * argument. 1486 * 1487 * The first CRTC should be the integrated panel on 1488 * most drivers, so this is the best choice we can 1489 * make. If we're not smart enough here, one should 1490 * just consider switch the userspace to KMS. 1491 */ 1492 mode_set = &fb_helper->crtc_info[0].mode_set; 1493 crtc = mode_set->crtc; 1494 1495 /* 1496 * Only wait for a vblank event if the CRTC is 1497 * enabled, otherwise just don't do anythintg, 1498 * not even report an error. 1499 */ 1500 ret = drm_crtc_vblank_get(crtc); 1501 if (!ret) { 1502 drm_crtc_wait_one_vblank(crtc); 1503 drm_crtc_vblank_put(crtc); 1504 } 1505 1506 ret = 0; 1507 goto unlock; 1508 #endif 1509 default: 1510 ret = -ENOTTY; 1511 } 1512 1513 unlock: 1514 mutex_unlock(&fb_helper->lock); 1515 return ret; 1516 } 1517 EXPORT_SYMBOL(drm_fb_helper_ioctl); 1518 1519 /** 1520 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var 1521 * @var: screeninfo to check 1522 * @info: fbdev registered by the helper 1523 */ 1524 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 1525 struct fb_info *info) 1526 { 1527 #if 0 1528 struct drm_fb_helper *fb_helper = info->par; 1529 struct drm_framebuffer *fb = fb_helper->fb; 1530 int depth; 1531 1532 if (var->pixclock != 0 || in_dbg_master()) 1533 return -EINVAL; 1534 1535 /* 1536 * Changes struct fb_var_screeninfo are currently not pushed back 1537 * to KMS, hence fail if different settings are requested. 1538 */ 1539 if (var->bits_per_pixel != fb->format->cpp[0] * 8 || 1540 var->xres > fb->width || var->yres > fb->height || 1541 var->xres_virtual > fb->width || var->yres_virtual > fb->height) { 1542 DRM_DEBUG("fb requested width/height/bpp can't fit in current fb " 1543 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", 1544 var->xres, var->yres, var->bits_per_pixel, 1545 var->xres_virtual, var->yres_virtual, 1546 fb->width, fb->height, fb->format->cpp[0] * 8); 1547 return -EINVAL; 1548 } 1549 1550 switch (var->bits_per_pixel) { 1551 case 16: 1552 depth = (var->green.length == 6) ? 16 : 15; 1553 break; 1554 case 32: 1555 depth = (var->transp.length > 0) ? 32 : 24; 1556 break; 1557 default: 1558 depth = var->bits_per_pixel; 1559 break; 1560 } 1561 1562 switch (depth) { 1563 case 8: 1564 var->red.offset = 0; 1565 var->green.offset = 0; 1566 var->blue.offset = 0; 1567 var->red.length = 8; 1568 var->green.length = 8; 1569 var->blue.length = 8; 1570 var->transp.length = 0; 1571 var->transp.offset = 0; 1572 break; 1573 case 15: 1574 var->red.offset = 10; 1575 var->green.offset = 5; 1576 var->blue.offset = 0; 1577 var->red.length = 5; 1578 var->green.length = 5; 1579 var->blue.length = 5; 1580 var->transp.length = 1; 1581 var->transp.offset = 15; 1582 break; 1583 case 16: 1584 var->red.offset = 11; 1585 var->green.offset = 5; 1586 var->blue.offset = 0; 1587 var->red.length = 5; 1588 var->green.length = 6; 1589 var->blue.length = 5; 1590 var->transp.length = 0; 1591 var->transp.offset = 0; 1592 break; 1593 case 24: 1594 var->red.offset = 16; 1595 var->green.offset = 8; 1596 var->blue.offset = 0; 1597 var->red.length = 8; 1598 var->green.length = 8; 1599 var->blue.length = 8; 1600 var->transp.length = 0; 1601 var->transp.offset = 0; 1602 break; 1603 case 32: 1604 var->red.offset = 16; 1605 var->green.offset = 8; 1606 var->blue.offset = 0; 1607 var->red.length = 8; 1608 var->green.length = 8; 1609 var->blue.length = 8; 1610 var->transp.length = 8; 1611 var->transp.offset = 24; 1612 break; 1613 default: 1614 return -EINVAL; 1615 } 1616 #endif 1617 return 0; 1618 } 1619 EXPORT_SYMBOL(drm_fb_helper_check_var); 1620 1621 /** 1622 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par 1623 * @info: fbdev registered by the helper 1624 * 1625 * This will let fbcon do the mode init and is called at initialization time by 1626 * the fbdev core when registering the driver, and later on through the hotplug 1627 * callback. 1628 */ 1629 int drm_fb_helper_set_par(struct fb_info *info) 1630 { 1631 struct drm_fb_helper *fb_helper = info->par; 1632 #if 0 1633 struct fb_var_screeninfo *var = &info->var; 1634 #endif 1635 1636 if (oops_in_progress) 1637 return -EBUSY; 1638 1639 #if 0 1640 if (var->pixclock != 0) { 1641 DRM_ERROR("PIXEL CLOCK SET\n"); 1642 return -EINVAL; 1643 } 1644 #endif 1645 1646 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); 1647 1648 return 0; 1649 } 1650 EXPORT_SYMBOL(drm_fb_helper_set_par); 1651 1652 #if 0 1653 static void pan_set(struct drm_fb_helper *fb_helper, int x, int y) 1654 { 1655 int i; 1656 1657 for (i = 0; i < fb_helper->crtc_count; i++) { 1658 struct drm_mode_set *mode_set; 1659 1660 mode_set = &fb_helper->crtc_info[i].mode_set; 1661 1662 mode_set->x = x; 1663 mode_set->y = y; 1664 } 1665 } 1666 1667 static int pan_display_atomic(struct fb_var_screeninfo *var, 1668 struct fb_info *info) 1669 { 1670 struct drm_fb_helper *fb_helper = info->par; 1671 int ret; 1672 1673 pan_set(fb_helper, var->xoffset, var->yoffset); 1674 1675 ret = restore_fbdev_mode_atomic(fb_helper, true); 1676 if (!ret) { 1677 info->var.xoffset = var->xoffset; 1678 info->var.yoffset = var->yoffset; 1679 } else 1680 pan_set(fb_helper, info->var.xoffset, info->var.yoffset); 1681 1682 return ret; 1683 } 1684 1685 static int pan_display_legacy(struct fb_var_screeninfo *var, 1686 struct fb_info *info) 1687 { 1688 struct drm_fb_helper *fb_helper = info->par; 1689 struct drm_mode_set *modeset; 1690 int ret = 0; 1691 int i; 1692 1693 drm_modeset_lock_all(fb_helper->dev); 1694 for (i = 0; i < fb_helper->crtc_count; i++) { 1695 modeset = &fb_helper->crtc_info[i].mode_set; 1696 1697 modeset->x = var->xoffset; 1698 modeset->y = var->yoffset; 1699 1700 if (modeset->num_connectors) { 1701 ret = drm_mode_set_config_internal(modeset); 1702 if (!ret) { 1703 info->var.xoffset = var->xoffset; 1704 info->var.yoffset = var->yoffset; 1705 } 1706 } 1707 } 1708 drm_modeset_unlock_all(fb_helper->dev); 1709 1710 return ret; 1711 } 1712 #endif 1713 1714 /** 1715 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display 1716 * @var: updated screen information 1717 * @info: fbdev registered by the helper 1718 */ 1719 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 1720 struct fb_info *info) 1721 { 1722 #if 0 1723 struct drm_fb_helper *fb_helper = info->par; 1724 struct drm_device *dev = fb_helper->dev; 1725 int ret; 1726 1727 if (oops_in_progress) 1728 return -EBUSY; 1729 1730 mutex_lock(&fb_helper->lock); 1731 if (!drm_fb_helper_is_bound(fb_helper)) { 1732 mutex_unlock(&fb_helper->lock); 1733 return -EBUSY; 1734 } 1735 1736 if (drm_drv_uses_atomic_modeset(dev)) 1737 ret = pan_display_atomic(var, info); 1738 else 1739 ret = pan_display_legacy(var, info); 1740 mutex_unlock(&fb_helper->lock); 1741 1742 return ret; 1743 #endif 1744 return 0; 1745 } 1746 EXPORT_SYMBOL(drm_fb_helper_pan_display); 1747 1748 /* 1749 * Allocates the backing storage and sets up the fbdev info structure through 1750 * the ->fb_probe callback. 1751 */ 1752 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, 1753 int preferred_bpp) 1754 { 1755 int ret = 0; 1756 int crtc_count = 0; 1757 int i; 1758 struct drm_fb_helper_surface_size sizes; 1759 int gamma_size = 0; 1760 #ifdef __DragonFly__ 1761 int kms_console = 1; 1762 #endif 1763 1764 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); 1765 sizes.surface_depth = 24; 1766 sizes.surface_bpp = 32; 1767 sizes.fb_width = (u32)-1; 1768 sizes.fb_height = (u32)-1; 1769 1770 /* if driver picks 8 or 16 by default use that for both depth/bpp */ 1771 if (preferred_bpp != sizes.surface_bpp) 1772 sizes.surface_depth = sizes.surface_bpp = preferred_bpp; 1773 1774 /* first up get a count of crtcs now in use and new min/maxes width/heights */ 1775 drm_fb_helper_for_each_connector(fb_helper, i) { 1776 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; 1777 struct drm_cmdline_mode *cmdline_mode; 1778 1779 cmdline_mode = &fb_helper_conn->connector->cmdline_mode; 1780 1781 if (cmdline_mode->bpp_specified) { 1782 switch (cmdline_mode->bpp) { 1783 case 8: 1784 sizes.surface_depth = sizes.surface_bpp = 8; 1785 break; 1786 case 15: 1787 sizes.surface_depth = 15; 1788 sizes.surface_bpp = 16; 1789 break; 1790 case 16: 1791 sizes.surface_depth = sizes.surface_bpp = 16; 1792 break; 1793 case 24: 1794 sizes.surface_depth = sizes.surface_bpp = 24; 1795 break; 1796 case 32: 1797 sizes.surface_depth = 24; 1798 sizes.surface_bpp = 32; 1799 break; 1800 } 1801 break; 1802 } 1803 } 1804 1805 crtc_count = 0; 1806 for (i = 0; i < fb_helper->crtc_count; i++) { 1807 struct drm_display_mode *desired_mode; 1808 struct drm_mode_set *mode_set; 1809 int x, y, j; 1810 /* in case of tile group, are we the last tile vert or horiz? 1811 * If no tile group you are always the last one both vertically 1812 * and horizontally 1813 */ 1814 bool lastv = true, lasth = true; 1815 1816 desired_mode = fb_helper->crtc_info[i].desired_mode; 1817 mode_set = &fb_helper->crtc_info[i].mode_set; 1818 1819 if (!desired_mode) 1820 continue; 1821 1822 crtc_count++; 1823 1824 x = fb_helper->crtc_info[i].x; 1825 y = fb_helper->crtc_info[i].y; 1826 1827 if (gamma_size == 0) 1828 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; 1829 1830 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width); 1831 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height); 1832 1833 for (j = 0; j < mode_set->num_connectors; j++) { 1834 struct drm_connector *connector = mode_set->connectors[j]; 1835 1836 if (connector->has_tile) { 1837 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1)); 1838 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1)); 1839 /* cloning to multiple tiles is just crazy-talk, so: */ 1840 break; 1841 } 1842 } 1843 1844 if (lasth) 1845 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width); 1846 if (lastv) 1847 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height); 1848 } 1849 1850 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { 1851 DRM_INFO("Cannot find any crtc or sizes\n"); 1852 1853 /* First time: disable all crtc's.. */ 1854 if (!fb_helper->deferred_setup && !READ_ONCE(fb_helper->dev->master)) 1855 restore_fbdev_mode(fb_helper); 1856 return -EAGAIN; 1857 } 1858 1859 /* Handle our overallocation */ 1860 sizes.surface_height *= drm_fbdev_overalloc; 1861 sizes.surface_height /= 100; 1862 1863 /* push down into drivers */ 1864 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); 1865 if (ret < 0) 1866 return ret; 1867 1868 #ifdef __DragonFly__ 1869 TUNABLE_INT_FETCH("kern.kms_console", &kms_console); 1870 if (kms_console) { 1871 if (register_framebuffer(fb_helper->fbdev) < 0) 1872 return -EINVAL; 1873 } 1874 #endif 1875 1876 return 0; 1877 } 1878 1879 #if 0 1880 /** 1881 * drm_fb_helper_fill_fix - initializes fixed fbdev information 1882 * @info: fbdev registered by the helper 1883 * @pitch: desired pitch 1884 * @depth: desired depth 1885 * 1886 * Helper to fill in the fixed fbdev information useful for a non-accelerated 1887 * fbdev emulations. Drivers which support acceleration methods which impose 1888 * additional constraints need to set up their own limits. 1889 * 1890 * Drivers should call this (or their equivalent setup code) from their 1891 * &drm_fb_helper_funcs.fb_probe callback. 1892 */ 1893 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 1894 uint32_t depth) 1895 { 1896 info->fix.type = FB_TYPE_PACKED_PIXELS; 1897 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : 1898 FB_VISUAL_TRUECOLOR; 1899 info->fix.mmio_start = 0; 1900 info->fix.mmio_len = 0; 1901 info->fix.type_aux = 0; 1902 info->fix.xpanstep = 1; /* doing it in hw */ 1903 info->fix.ypanstep = 1; /* doing it in hw */ 1904 info->fix.ywrapstep = 0; 1905 info->fix.accel = FB_ACCEL_NONE; 1906 1907 info->fix.line_length = pitch; 1908 } 1909 EXPORT_SYMBOL(drm_fb_helper_fill_fix); 1910 1911 /** 1912 * drm_fb_helper_fill_var - initalizes variable fbdev information 1913 * @info: fbdev instance to set up 1914 * @fb_helper: fb helper instance to use as template 1915 * @fb_width: desired fb width 1916 * @fb_height: desired fb height 1917 * 1918 * Sets up the variable fbdev metainformation from the given fb helper instance 1919 * and the drm framebuffer allocated in &drm_fb_helper.fb. 1920 * 1921 * Drivers should call this (or their equivalent setup code) from their 1922 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev 1923 * backing storage framebuffer. 1924 */ 1925 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 1926 uint32_t fb_width, uint32_t fb_height) 1927 { 1928 struct drm_framebuffer *fb = fb_helper->fb; 1929 1930 info->pseudo_palette = fb_helper->pseudo_palette; 1931 info->var.xres_virtual = fb->width; 1932 info->var.yres_virtual = fb->height; 1933 info->var.bits_per_pixel = fb->format->cpp[0] * 8; 1934 info->var.accel_flags = FB_ACCELF_TEXT; 1935 info->var.xoffset = 0; 1936 info->var.yoffset = 0; 1937 info->var.activate = FB_ACTIVATE_NOW; 1938 1939 switch (fb->format->depth) { 1940 case 8: 1941 info->var.red.offset = 0; 1942 info->var.green.offset = 0; 1943 info->var.blue.offset = 0; 1944 info->var.red.length = 8; /* 8bit DAC */ 1945 info->var.green.length = 8; 1946 info->var.blue.length = 8; 1947 info->var.transp.offset = 0; 1948 info->var.transp.length = 0; 1949 break; 1950 case 15: 1951 info->var.red.offset = 10; 1952 info->var.green.offset = 5; 1953 info->var.blue.offset = 0; 1954 info->var.red.length = 5; 1955 info->var.green.length = 5; 1956 info->var.blue.length = 5; 1957 info->var.transp.offset = 15; 1958 info->var.transp.length = 1; 1959 break; 1960 case 16: 1961 info->var.red.offset = 11; 1962 info->var.green.offset = 5; 1963 info->var.blue.offset = 0; 1964 info->var.red.length = 5; 1965 info->var.green.length = 6; 1966 info->var.blue.length = 5; 1967 info->var.transp.offset = 0; 1968 break; 1969 case 24: 1970 info->var.red.offset = 16; 1971 info->var.green.offset = 8; 1972 info->var.blue.offset = 0; 1973 info->var.red.length = 8; 1974 info->var.green.length = 8; 1975 info->var.blue.length = 8; 1976 info->var.transp.offset = 0; 1977 info->var.transp.length = 0; 1978 break; 1979 case 32: 1980 info->var.red.offset = 16; 1981 info->var.green.offset = 8; 1982 info->var.blue.offset = 0; 1983 info->var.red.length = 8; 1984 info->var.green.length = 8; 1985 info->var.blue.length = 8; 1986 info->var.transp.offset = 24; 1987 info->var.transp.length = 8; 1988 break; 1989 default: 1990 break; 1991 } 1992 1993 info->var.xres = fb_width; 1994 info->var.yres = fb_height; 1995 } 1996 EXPORT_SYMBOL(drm_fb_helper_fill_var); 1997 #endif 1998 1999 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, 2000 uint32_t maxX, 2001 uint32_t maxY) 2002 { 2003 struct drm_connector *connector; 2004 int i, count = 0; 2005 2006 drm_fb_helper_for_each_connector(fb_helper, i) { 2007 connector = fb_helper->connector_info[i]->connector; 2008 count += connector->funcs->fill_modes(connector, maxX, maxY); 2009 } 2010 2011 return count; 2012 } 2013 2014 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) 2015 { 2016 struct drm_display_mode *mode; 2017 2018 list_for_each_entry(mode, &fb_connector->connector->modes, head) { 2019 if (mode->hdisplay > width || 2020 mode->vdisplay > height) 2021 continue; 2022 if (mode->type & DRM_MODE_TYPE_PREFERRED) 2023 return mode; 2024 } 2025 return NULL; 2026 } 2027 EXPORT_SYMBOL(drm_has_preferred_mode); 2028 2029 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) 2030 { 2031 return fb_connector->connector->cmdline_mode.specified; 2032 } 2033 2034 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn) 2035 { 2036 struct drm_cmdline_mode *cmdline_mode; 2037 struct drm_display_mode *mode; 2038 bool prefer_non_interlace; 2039 2040 cmdline_mode = &fb_helper_conn->connector->cmdline_mode; 2041 if (cmdline_mode->specified == false) 2042 return NULL; 2043 2044 /* attempt to find a matching mode in the list of modes 2045 * we have gotten so far, if not add a CVT mode that conforms 2046 */ 2047 if (cmdline_mode->rb || cmdline_mode->margins) 2048 goto create_mode; 2049 2050 prefer_non_interlace = !cmdline_mode->interlace; 2051 again: 2052 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 2053 /* check width/height */ 2054 if (mode->hdisplay != cmdline_mode->xres || 2055 mode->vdisplay != cmdline_mode->yres) 2056 continue; 2057 2058 if (cmdline_mode->refresh_specified) { 2059 if (mode->vrefresh != cmdline_mode->refresh) 2060 continue; 2061 } 2062 2063 if (cmdline_mode->interlace) { 2064 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) 2065 continue; 2066 } else if (prefer_non_interlace) { 2067 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 2068 continue; 2069 } 2070 return mode; 2071 } 2072 2073 if (prefer_non_interlace) { 2074 prefer_non_interlace = false; 2075 goto again; 2076 } 2077 2078 create_mode: 2079 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, 2080 cmdline_mode); 2081 list_add(&mode->head, &fb_helper_conn->connector->modes); 2082 return mode; 2083 } 2084 EXPORT_SYMBOL(drm_pick_cmdline_mode); 2085 2086 static bool drm_connector_enabled(struct drm_connector *connector, bool strict) 2087 { 2088 bool enable; 2089 2090 if (connector->display_info.non_desktop) 2091 return false; 2092 2093 if (strict) 2094 enable = connector->status == connector_status_connected; 2095 else 2096 enable = connector->status != connector_status_disconnected; 2097 2098 return enable; 2099 } 2100 2101 static void drm_enable_connectors(struct drm_fb_helper *fb_helper, 2102 bool *enabled) 2103 { 2104 bool any_enabled = false; 2105 struct drm_connector *connector; 2106 int i = 0; 2107 2108 drm_fb_helper_for_each_connector(fb_helper, i) { 2109 connector = fb_helper->connector_info[i]->connector; 2110 enabled[i] = drm_connector_enabled(connector, true); 2111 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, 2112 connector->display_info.non_desktop ? "non desktop" : enabled[i] ? "yes" : "no"); 2113 2114 any_enabled |= enabled[i]; 2115 } 2116 2117 if (any_enabled) 2118 return; 2119 2120 drm_fb_helper_for_each_connector(fb_helper, i) { 2121 connector = fb_helper->connector_info[i]->connector; 2122 enabled[i] = drm_connector_enabled(connector, false); 2123 } 2124 } 2125 2126 static bool drm_target_cloned(struct drm_fb_helper *fb_helper, 2127 struct drm_display_mode **modes, 2128 struct drm_fb_offset *offsets, 2129 bool *enabled, int width, int height) 2130 { 2131 int count, i, j; 2132 bool can_clone = false; 2133 struct drm_fb_helper_connector *fb_helper_conn; 2134 struct drm_display_mode *dmt_mode, *mode; 2135 2136 /* only contemplate cloning in the single crtc case */ 2137 if (fb_helper->crtc_count > 1) 2138 return false; 2139 2140 count = 0; 2141 drm_fb_helper_for_each_connector(fb_helper, i) { 2142 if (enabled[i]) 2143 count++; 2144 } 2145 2146 /* only contemplate cloning if more than one connector is enabled */ 2147 if (count <= 1) 2148 return false; 2149 2150 /* check the command line or if nothing common pick 1024x768 */ 2151 can_clone = true; 2152 drm_fb_helper_for_each_connector(fb_helper, i) { 2153 if (!enabled[i]) 2154 continue; 2155 fb_helper_conn = fb_helper->connector_info[i]; 2156 modes[i] = drm_pick_cmdline_mode(fb_helper_conn); 2157 if (!modes[i]) { 2158 can_clone = false; 2159 break; 2160 } 2161 for (j = 0; j < i; j++) { 2162 if (!enabled[j]) 2163 continue; 2164 if (!drm_mode_equal(modes[j], modes[i])) 2165 can_clone = false; 2166 } 2167 } 2168 2169 if (can_clone) { 2170 DRM_DEBUG_KMS("can clone using command line\n"); 2171 return true; 2172 } 2173 2174 /* try and find a 1024x768 mode on each connector */ 2175 can_clone = true; 2176 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false); 2177 2178 drm_fb_helper_for_each_connector(fb_helper, i) { 2179 if (!enabled[i]) 2180 continue; 2181 2182 fb_helper_conn = fb_helper->connector_info[i]; 2183 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 2184 if (drm_mode_equal(mode, dmt_mode)) 2185 modes[i] = mode; 2186 } 2187 if (!modes[i]) 2188 can_clone = false; 2189 } 2190 2191 if (can_clone) { 2192 DRM_DEBUG_KMS("can clone using 1024x768\n"); 2193 return true; 2194 } 2195 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); 2196 return false; 2197 } 2198 2199 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper, 2200 struct drm_display_mode **modes, 2201 struct drm_fb_offset *offsets, 2202 int idx, 2203 int h_idx, int v_idx) 2204 { 2205 struct drm_fb_helper_connector *fb_helper_conn; 2206 int i; 2207 int hoffset = 0, voffset = 0; 2208 2209 drm_fb_helper_for_each_connector(fb_helper, i) { 2210 fb_helper_conn = fb_helper->connector_info[i]; 2211 if (!fb_helper_conn->connector->has_tile) 2212 continue; 2213 2214 if (!modes[i] && (h_idx || v_idx)) { 2215 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i, 2216 fb_helper_conn->connector->base.id); 2217 continue; 2218 } 2219 if (fb_helper_conn->connector->tile_h_loc < h_idx) 2220 hoffset += modes[i]->hdisplay; 2221 2222 if (fb_helper_conn->connector->tile_v_loc < v_idx) 2223 voffset += modes[i]->vdisplay; 2224 } 2225 offsets[idx].x = hoffset; 2226 offsets[idx].y = voffset; 2227 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx); 2228 return 0; 2229 } 2230 2231 static bool drm_target_preferred(struct drm_fb_helper *fb_helper, 2232 struct drm_display_mode **modes, 2233 struct drm_fb_offset *offsets, 2234 bool *enabled, int width, int height) 2235 { 2236 struct drm_fb_helper_connector *fb_helper_conn; 2237 const u64 mask = BIT_ULL(fb_helper->connector_count) - 1; 2238 u64 conn_configured = 0; 2239 int tile_pass = 0; 2240 int i; 2241 2242 retry: 2243 drm_fb_helper_for_each_connector(fb_helper, i) { 2244 fb_helper_conn = fb_helper->connector_info[i]; 2245 2246 if (conn_configured & BIT_ULL(i)) 2247 continue; 2248 2249 if (enabled[i] == false) { 2250 conn_configured |= BIT_ULL(i); 2251 continue; 2252 } 2253 2254 /* first pass over all the untiled connectors */ 2255 if (tile_pass == 0 && fb_helper_conn->connector->has_tile) 2256 continue; 2257 2258 if (tile_pass == 1) { 2259 if (fb_helper_conn->connector->tile_h_loc != 0 || 2260 fb_helper_conn->connector->tile_v_loc != 0) 2261 continue; 2262 2263 } else { 2264 if (fb_helper_conn->connector->tile_h_loc != tile_pass - 1 && 2265 fb_helper_conn->connector->tile_v_loc != tile_pass - 1) 2266 /* if this tile_pass doesn't cover any of the tiles - keep going */ 2267 continue; 2268 2269 /* 2270 * find the tile offsets for this pass - need to find 2271 * all tiles left and above 2272 */ 2273 drm_get_tile_offsets(fb_helper, modes, offsets, 2274 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc); 2275 } 2276 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", 2277 fb_helper_conn->connector->base.id); 2278 2279 /* got for command line mode first */ 2280 modes[i] = drm_pick_cmdline_mode(fb_helper_conn); 2281 if (!modes[i]) { 2282 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n", 2283 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0); 2284 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); 2285 } 2286 /* No preferred modes, pick one off the list */ 2287 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { 2288 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) 2289 break; 2290 } 2291 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : 2292 "none"); 2293 conn_configured |= BIT_ULL(i); 2294 } 2295 2296 if ((conn_configured & mask) != mask) { 2297 tile_pass++; 2298 goto retry; 2299 } 2300 return true; 2301 } 2302 2303 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, 2304 struct drm_fb_helper_crtc **best_crtcs, 2305 struct drm_display_mode **modes, 2306 int n, int width, int height) 2307 { 2308 int c, o; 2309 struct drm_connector *connector; 2310 const struct drm_connector_helper_funcs *connector_funcs; 2311 struct drm_encoder *encoder; 2312 int my_score, best_score, score; 2313 struct drm_fb_helper_crtc **crtcs, *crtc; 2314 struct drm_fb_helper_connector *fb_helper_conn; 2315 2316 if (n == fb_helper->connector_count) 2317 return 0; 2318 2319 fb_helper_conn = fb_helper->connector_info[n]; 2320 connector = fb_helper_conn->connector; 2321 2322 best_crtcs[n] = NULL; 2323 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); 2324 if (modes[n] == NULL) 2325 return best_score; 2326 2327 crtcs = kcalloc(fb_helper->connector_count, 2328 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 2329 if (!crtcs) 2330 return best_score; 2331 2332 my_score = 1; 2333 if (connector->status == connector_status_connected) 2334 my_score++; 2335 if (drm_has_cmdline_mode(fb_helper_conn)) 2336 my_score++; 2337 if (drm_has_preferred_mode(fb_helper_conn, width, height)) 2338 my_score++; 2339 2340 connector_funcs = connector->helper_private; 2341 2342 /* 2343 * If the DRM device implements atomic hooks and ->best_encoder() is 2344 * NULL we fallback to the default drm_atomic_helper_best_encoder() 2345 * helper. 2346 */ 2347 if (drm_drv_uses_atomic_modeset(fb_helper->dev) && 2348 !connector_funcs->best_encoder) 2349 encoder = drm_atomic_helper_best_encoder(connector); 2350 else 2351 encoder = connector_funcs->best_encoder(connector); 2352 2353 if (!encoder) 2354 goto out; 2355 2356 /* 2357 * select a crtc for this connector and then attempt to configure 2358 * remaining connectors 2359 */ 2360 for (c = 0; c < fb_helper->crtc_count; c++) { 2361 crtc = &fb_helper->crtc_info[c]; 2362 2363 if ((encoder->possible_crtcs & (1 << c)) == 0) 2364 continue; 2365 2366 for (o = 0; o < n; o++) 2367 if (best_crtcs[o] == crtc) 2368 break; 2369 2370 if (o < n) { 2371 /* ignore cloning unless only a single crtc */ 2372 if (fb_helper->crtc_count > 1) 2373 continue; 2374 2375 if (!drm_mode_equal(modes[o], modes[n])) 2376 continue; 2377 } 2378 2379 crtcs[n] = crtc; 2380 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); 2381 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, 2382 width, height); 2383 if (score > best_score) { 2384 best_score = score; 2385 memcpy(best_crtcs, crtcs, 2386 fb_helper->connector_count * 2387 sizeof(struct drm_fb_helper_crtc *)); 2388 } 2389 } 2390 out: 2391 kfree(crtcs); 2392 return best_score; 2393 } 2394 2395 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper, 2396 u32 width, u32 height) 2397 { 2398 struct drm_device *dev = fb_helper->dev; 2399 struct drm_fb_helper_crtc **crtcs; 2400 struct drm_display_mode **modes; 2401 struct drm_fb_offset *offsets; 2402 bool *enabled; 2403 int i; 2404 2405 DRM_DEBUG_KMS("\n"); 2406 /* prevent concurrent modification of connector_count by hotplug */ 2407 lockdep_assert_held(&fb_helper->lock); 2408 2409 crtcs = kcalloc(fb_helper->connector_count, 2410 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 2411 modes = kcalloc(fb_helper->connector_count, 2412 sizeof(struct drm_display_mode *), GFP_KERNEL); 2413 offsets = kcalloc(fb_helper->connector_count, 2414 sizeof(struct drm_fb_offset), GFP_KERNEL); 2415 enabled = kcalloc(fb_helper->connector_count, 2416 sizeof(bool), GFP_KERNEL); 2417 if (!crtcs || !modes || !enabled || !offsets) { 2418 DRM_ERROR("Memory allocation failed\n"); 2419 goto out; 2420 } 2421 2422 mutex_lock(&fb_helper->dev->mode_config.mutex); 2423 if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0) 2424 DRM_DEBUG_KMS("No connectors reported connected with modes\n"); 2425 drm_enable_connectors(fb_helper, enabled); 2426 2427 if (!(fb_helper->funcs->initial_config && 2428 fb_helper->funcs->initial_config(fb_helper, crtcs, modes, 2429 offsets, 2430 enabled, width, height))) { 2431 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0])); 2432 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0])); 2433 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0])); 2434 2435 if (!drm_target_cloned(fb_helper, modes, offsets, 2436 enabled, width, height) && 2437 !drm_target_preferred(fb_helper, modes, offsets, 2438 enabled, width, height)) 2439 DRM_ERROR("Unable to find initial modes\n"); 2440 2441 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", 2442 width, height); 2443 2444 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); 2445 } 2446 mutex_unlock(&fb_helper->dev->mode_config.mutex); 2447 2448 /* need to set the modesets up here for use later */ 2449 /* fill out the connector<->crtc mappings into the modesets */ 2450 for (i = 0; i < fb_helper->crtc_count; i++) 2451 drm_fb_helper_modeset_release(fb_helper, 2452 &fb_helper->crtc_info[i].mode_set); 2453 2454 drm_fb_helper_for_each_connector(fb_helper, i) { 2455 struct drm_display_mode *mode = modes[i]; 2456 struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; 2457 struct drm_fb_offset *offset = &offsets[i]; 2458 2459 if (mode && fb_crtc) { 2460 struct drm_mode_set *modeset = &fb_crtc->mode_set; 2461 struct drm_connector *connector = 2462 fb_helper->connector_info[i]->connector; 2463 2464 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n", 2465 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y); 2466 2467 fb_crtc->desired_mode = mode; 2468 fb_crtc->x = offset->x; 2469 fb_crtc->y = offset->y; 2470 modeset->mode = drm_mode_duplicate(dev, 2471 fb_crtc->desired_mode); 2472 drm_connector_get(connector); 2473 modeset->connectors[modeset->num_connectors++] = connector; 2474 modeset->x = offset->x; 2475 modeset->y = offset->y; 2476 } 2477 } 2478 out: 2479 kfree(crtcs); 2480 kfree(modes); 2481 kfree(offsets); 2482 kfree(enabled); 2483 } 2484 2485 /* 2486 * This is a continuation of drm_setup_crtcs() that sets up anything related 2487 * to the framebuffer. During initialization, drm_setup_crtcs() is called before 2488 * the framebuffer has been allocated (fb_helper->fb and fb_helper->fbdev). 2489 * So, any setup that touches those fields needs to be done here instead of in 2490 * drm_setup_crtcs(). 2491 */ 2492 static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper) 2493 { 2494 #if 0 2495 struct fb_info *info = fb_helper->fbdev; 2496 #endif 2497 int i; 2498 2499 for (i = 0; i < fb_helper->crtc_count; i++) 2500 if (fb_helper->crtc_info[i].mode_set.num_connectors) 2501 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; 2502 2503 mutex_lock(&fb_helper->dev->mode_config.mutex); 2504 drm_fb_helper_for_each_connector(fb_helper, i) { 2505 struct drm_connector *connector = 2506 fb_helper->connector_info[i]->connector; 2507 2508 /* use first connected connector for the physical dimensions */ 2509 if (connector->status == connector_status_connected) { 2510 #if 0 2511 info->var.width = connector->display_info.width_mm; 2512 info->var.height = connector->display_info.height_mm; 2513 #endif 2514 break; 2515 } 2516 } 2517 mutex_unlock(&fb_helper->dev->mode_config.mutex); 2518 } 2519 2520 /* Note: Drops fb_helper->lock before returning. */ 2521 static int 2522 __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper, 2523 int bpp_sel) 2524 { 2525 struct drm_device *dev = fb_helper->dev; 2526 struct fb_info *info; 2527 unsigned int width, height; 2528 int ret; 2529 2530 width = dev->mode_config.max_width; 2531 height = dev->mode_config.max_height; 2532 2533 drm_setup_crtcs(fb_helper, width, height); 2534 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 2535 if (ret < 0) { 2536 if (ret == -EAGAIN) { 2537 fb_helper->preferred_bpp = bpp_sel; 2538 fb_helper->deferred_setup = true; 2539 ret = 0; 2540 } 2541 mutex_unlock(&fb_helper->lock); 2542 2543 return ret; 2544 } 2545 drm_setup_crtcs_fb(fb_helper); 2546 2547 fb_helper->deferred_setup = false; 2548 2549 info = fb_helper->fbdev; 2550 #if 0 2551 info->var.pixclock = 0; 2552 #endif 2553 2554 /* Need to drop locks to avoid recursive deadlock in 2555 * register_framebuffer. This is ok because the only thing left to do is 2556 * register the fbdev emulation instance in kernel_fb_helper_list. */ 2557 mutex_unlock(&fb_helper->lock); 2558 2559 ret = register_framebuffer(info); 2560 if (ret < 0) 2561 return ret; 2562 2563 #if 0 2564 dev_info(dev->dev, "fb%d: %s frame buffer device\n", 2565 info->node, info->fix.id); 2566 #endif 2567 2568 mutex_lock(&kernel_fb_helper_lock); 2569 #if 0 2570 if (list_empty(&kernel_fb_helper_list)) 2571 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 2572 #endif 2573 2574 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 2575 mutex_unlock(&kernel_fb_helper_lock); 2576 2577 return 0; 2578 } 2579 2580 /** 2581 * drm_fb_helper_initial_config - setup a sane initial connector configuration 2582 * @fb_helper: fb_helper device struct 2583 * @bpp_sel: bpp value to use for the framebuffer configuration 2584 * 2585 * Scans the CRTCs and connectors and tries to put together an initial setup. 2586 * At the moment, this is a cloned configuration across all heads with 2587 * a new framebuffer object as the backing store. 2588 * 2589 * Note that this also registers the fbdev and so allows userspace to call into 2590 * the driver through the fbdev interfaces. 2591 * 2592 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback 2593 * to let the driver allocate and initialize the fbdev info structure and the 2594 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_var() and 2595 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default 2596 * values for the fbdev info structure. 2597 * 2598 * HANG DEBUGGING: 2599 * 2600 * When you have fbcon support built-in or already loaded, this function will do 2601 * a full modeset to setup the fbdev console. Due to locking misdesign in the 2602 * VT/fbdev subsystem that entire modeset sequence has to be done while holding 2603 * console_lock. Until console_unlock is called no dmesg lines will be sent out 2604 * to consoles, not even serial console. This means when your driver crashes, 2605 * you will see absolutely nothing else but a system stuck in this function, 2606 * with no further output. Any kind of printk() you place within your own driver 2607 * or in the drm core modeset code will also never show up. 2608 * 2609 * Standard debug practice is to run the fbcon setup without taking the 2610 * console_lock as a hack, to be able to see backtraces and crashes on the 2611 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel 2612 * cmdline option. 2613 * 2614 * The other option is to just disable fbdev emulation since very likely the 2615 * first modeset from userspace will crash in the same way, and is even easier 2616 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0 2617 * kernel cmdline option. 2618 * 2619 * RETURNS: 2620 * Zero if everything went ok, nonzero otherwise. 2621 */ 2622 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) 2623 { 2624 struct drm_device *dev = fb_helper->dev; 2625 struct fb_info *info; 2626 int ret; 2627 2628 if (!drm_fbdev_emulation) 2629 return 0; 2630 2631 mutex_lock(&fb_helper->lock); 2632 drm_setup_crtcs(fb_helper, 2633 dev->mode_config.max_width, 2634 dev->mode_config.max_height); 2635 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 2636 mutex_unlock(&fb_helper->lock); 2637 if (ret) 2638 return ret; 2639 2640 info = fb_helper->fbdev; 2641 #if 0 2642 info->var.pixclock = 0; 2643 #endif 2644 ret = register_framebuffer(info); 2645 if (ret < 0) 2646 return ret; 2647 2648 #if 0 2649 dev_info(dev->dev, "fb%d: %s frame buffer device\n", 2650 info->node, info->fix.id); 2651 #endif 2652 2653 mutex_lock(&kernel_fb_helper_lock); 2654 #if 0 2655 if (list_empty(&kernel_fb_helper_list)) 2656 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 2657 #endif 2658 2659 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 2660 mutex_unlock(&kernel_fb_helper_lock); 2661 2662 return 0; 2663 } 2664 EXPORT_SYMBOL(drm_fb_helper_initial_config); 2665 2666 /** 2667 * drm_fb_helper_hotplug_event - respond to a hotplug notification by 2668 * probing all the outputs attached to the fb 2669 * @fb_helper: the drm_fb_helper 2670 * 2671 * Scan the connectors attached to the fb_helper and try to put together a 2672 * setup after notification of a change in output configuration. 2673 * 2674 * Called at runtime, takes the mode config locks to be able to check/change the 2675 * modeset configuration. Must be run from process context (which usually means 2676 * either the output polling work or a work item launched from the driver's 2677 * hotplug interrupt). 2678 * 2679 * Note that drivers may call this even before calling 2680 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows 2681 * for a race-free fbcon setup and will make sure that the fbdev emulation will 2682 * not miss any hotplug events. 2683 * 2684 * RETURNS: 2685 * 0 on success and a non-zero error code otherwise. 2686 */ 2687 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 2688 { 2689 int err = 0; 2690 2691 if (!drm_fbdev_emulation) 2692 return 0; 2693 2694 mutex_lock(&fb_helper->lock); 2695 if (fb_helper->deferred_setup) { 2696 err = __drm_fb_helper_initial_config_and_unlock(fb_helper, 2697 fb_helper->preferred_bpp); 2698 return err; 2699 } 2700 2701 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) { 2702 fb_helper->delayed_hotplug = true; 2703 mutex_unlock(&fb_helper->lock); 2704 return err; 2705 } 2706 2707 DRM_DEBUG_KMS("\n"); 2708 2709 drm_setup_crtcs(fb_helper, fb_helper->fb->width, fb_helper->fb->height); 2710 drm_setup_crtcs_fb(fb_helper); 2711 mutex_unlock(&fb_helper->lock); 2712 2713 drm_fb_helper_set_par(fb_helper->fbdev); 2714 2715 return 0; 2716 } 2717 EXPORT_SYMBOL(drm_fb_helper_hotplug_event); 2718 2719 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) 2720 * but the module doesn't depend on any fb console symbols. At least 2721 * attempt to load fbcon to avoid leaving the system without a usable console. 2722 */ 2723 int __init drm_fb_helper_modinit(void) 2724 { 2725 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) 2726 const char name[] = "fbcon"; 2727 struct module *fbcon; 2728 2729 mutex_lock(&module_mutex); 2730 fbcon = find_module(name); 2731 mutex_unlock(&module_mutex); 2732 2733 if (!fbcon) 2734 request_module_nowait(name); 2735 #endif 2736 return 0; 2737 } 2738 EXPORT_SYMBOL(drm_fb_helper_modinit); 2739