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