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 #include <linux/kernel.h> 31 #include <linux/sysrq.h> 32 #include <linux/slab.h> 33 #include <linux/fb.h> 34 #include <linux/module.h> 35 #include "drmP.h" 36 #include "drm_crtc.h" 37 #include "drm_fb_helper.h" 38 #include "drm_crtc_helper.h" 39 40 MODULE_AUTHOR("David Airlie, Jesse Barnes"); 41 MODULE_DESCRIPTION("DRM KMS helper"); 42 MODULE_LICENSE("GPL and additional rights"); 43 44 static LIST_HEAD(kernel_fb_helper_list); 45 46 /* simple single crtc case helper function */ 47 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) 48 { 49 struct drm_device *dev = fb_helper->dev; 50 struct drm_connector *connector; 51 int i; 52 53 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 54 struct drm_fb_helper_connector *fb_helper_connector; 55 56 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL); 57 if (!fb_helper_connector) 58 goto fail; 59 60 fb_helper_connector->connector = connector; 61 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; 62 } 63 return 0; 64 fail: 65 for (i = 0; i < fb_helper->connector_count; i++) { 66 kfree(fb_helper->connector_info[i]); 67 fb_helper->connector_info[i] = NULL; 68 } 69 fb_helper->connector_count = 0; 70 return -ENOMEM; 71 } 72 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); 73 74 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper) 75 { 76 struct drm_fb_helper_connector *fb_helper_conn; 77 int i; 78 79 for (i = 0; i < fb_helper->connector_count; i++) { 80 struct drm_cmdline_mode *mode; 81 struct drm_connector *connector; 82 char *option = NULL; 83 84 fb_helper_conn = fb_helper->connector_info[i]; 85 connector = fb_helper_conn->connector; 86 mode = &fb_helper_conn->cmdline_mode; 87 88 /* do something on return - turn off connector maybe */ 89 if (fb_get_options(drm_get_connector_name(connector), &option)) 90 continue; 91 92 if (drm_mode_parse_command_line_for_connector(option, 93 connector, 94 mode)) { 95 if (mode->force) { 96 const char *s; 97 switch (mode->force) { 98 case DRM_FORCE_OFF: s = "OFF"; break; 99 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break; 100 default: 101 case DRM_FORCE_ON: s = "ON"; break; 102 } 103 104 DRM_INFO("forcing %s connector %s\n", 105 drm_get_connector_name(connector), s); 106 connector->force = mode->force; 107 } 108 109 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n", 110 drm_get_connector_name(connector), 111 mode->xres, mode->yres, 112 mode->refresh_specified ? mode->refresh : 60, 113 mode->rb ? " reduced blanking" : "", 114 mode->margins ? " with margins" : "", 115 mode->interlace ? " interlaced" : ""); 116 } 117 118 } 119 return 0; 120 } 121 122 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper) 123 { 124 uint16_t *r_base, *g_base, *b_base; 125 int i; 126 127 r_base = crtc->gamma_store; 128 g_base = r_base + crtc->gamma_size; 129 b_base = g_base + crtc->gamma_size; 130 131 for (i = 0; i < crtc->gamma_size; i++) 132 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i); 133 } 134 135 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc) 136 { 137 uint16_t *r_base, *g_base, *b_base; 138 139 r_base = crtc->gamma_store; 140 g_base = r_base + crtc->gamma_size; 141 b_base = g_base + crtc->gamma_size; 142 143 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size); 144 } 145 146 int drm_fb_helper_debug_enter(struct fb_info *info) 147 { 148 struct drm_fb_helper *helper = info->par; 149 struct drm_crtc_helper_funcs *funcs; 150 int i; 151 152 if (list_empty(&kernel_fb_helper_list)) 153 return false; 154 155 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 156 for (i = 0; i < helper->crtc_count; i++) { 157 struct drm_mode_set *mode_set = 158 &helper->crtc_info[i].mode_set; 159 160 if (!mode_set->crtc->enabled) 161 continue; 162 163 funcs = mode_set->crtc->helper_private; 164 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper); 165 funcs->mode_set_base_atomic(mode_set->crtc, 166 mode_set->fb, 167 mode_set->x, 168 mode_set->y, 169 ENTER_ATOMIC_MODE_SET); 170 } 171 } 172 173 return 0; 174 } 175 EXPORT_SYMBOL(drm_fb_helper_debug_enter); 176 177 /* Find the real fb for a given fb helper CRTC */ 178 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc) 179 { 180 struct drm_device *dev = crtc->dev; 181 struct drm_crtc *c; 182 183 list_for_each_entry(c, &dev->mode_config.crtc_list, head) { 184 if (crtc->base.id == c->base.id) 185 return c->fb; 186 } 187 188 return NULL; 189 } 190 191 int drm_fb_helper_debug_leave(struct fb_info *info) 192 { 193 struct drm_fb_helper *helper = info->par; 194 struct drm_crtc *crtc; 195 struct drm_crtc_helper_funcs *funcs; 196 struct drm_framebuffer *fb; 197 int i; 198 199 for (i = 0; i < helper->crtc_count; i++) { 200 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; 201 crtc = mode_set->crtc; 202 funcs = crtc->helper_private; 203 fb = drm_mode_config_fb(crtc); 204 205 if (!crtc->enabled) 206 continue; 207 208 if (!fb) { 209 DRM_ERROR("no fb to restore??\n"); 210 continue; 211 } 212 213 drm_fb_helper_restore_lut_atomic(mode_set->crtc); 214 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, 215 crtc->y, LEAVE_ATOMIC_MODE_SET); 216 } 217 218 return 0; 219 } 220 EXPORT_SYMBOL(drm_fb_helper_debug_leave); 221 222 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper) 223 { 224 bool error = false; 225 int i, ret; 226 for (i = 0; i < fb_helper->crtc_count; i++) { 227 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 228 ret = drm_crtc_helper_set_config(mode_set); 229 if (ret) 230 error = true; 231 } 232 return error; 233 } 234 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode); 235 236 bool drm_fb_helper_force_kernel_mode(void) 237 { 238 bool ret, error = false; 239 struct drm_fb_helper *helper; 240 241 if (list_empty(&kernel_fb_helper_list)) 242 return false; 243 244 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 245 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF) 246 continue; 247 248 ret = drm_fb_helper_restore_fbdev_mode(helper); 249 if (ret) 250 error = true; 251 } 252 return error; 253 } 254 255 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed, 256 void *panic_str) 257 { 258 /* 259 * It's a waste of time and effort to switch back to text console 260 * if the kernel should reboot before panic messages can be seen. 261 */ 262 if (panic_timeout < 0) 263 return 0; 264 265 printk(KERN_ERR "panic occurred, switching back to text console\n"); 266 return drm_fb_helper_force_kernel_mode(); 267 } 268 EXPORT_SYMBOL(drm_fb_helper_panic); 269 270 static struct notifier_block paniced = { 271 .notifier_call = drm_fb_helper_panic, 272 }; 273 274 /** 275 * drm_fb_helper_restore - restore the framebuffer console (kernel) config 276 * 277 * Restore's the kernel's fbcon mode, used for lastclose & panic paths. 278 */ 279 void drm_fb_helper_restore(void) 280 { 281 bool ret; 282 ret = drm_fb_helper_force_kernel_mode(); 283 if (ret == true) 284 DRM_ERROR("Failed to restore crtc configuration\n"); 285 } 286 EXPORT_SYMBOL(drm_fb_helper_restore); 287 288 #ifdef CONFIG_MAGIC_SYSRQ 289 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) 290 { 291 drm_fb_helper_restore(); 292 } 293 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); 294 295 static void drm_fb_helper_sysrq(int dummy1) 296 { 297 schedule_work(&drm_fb_helper_restore_work); 298 } 299 300 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { 301 .handler = drm_fb_helper_sysrq, 302 .help_msg = "force-fb(V)", 303 .action_msg = "Restore framebuffer console", 304 }; 305 #else 306 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; 307 #endif 308 309 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) 310 { 311 struct drm_fb_helper *fb_helper = info->par; 312 struct drm_device *dev = fb_helper->dev; 313 struct drm_crtc *crtc; 314 struct drm_connector *connector; 315 int i, j; 316 317 /* 318 * For each CRTC in this fb, turn the connectors on/off. 319 */ 320 mutex_lock(&dev->mode_config.mutex); 321 for (i = 0; i < fb_helper->crtc_count; i++) { 322 crtc = fb_helper->crtc_info[i].mode_set.crtc; 323 324 if (!crtc->enabled) 325 continue; 326 327 /* Walk the connectors & encoders on this fb turning them on/off */ 328 for (j = 0; j < fb_helper->connector_count; j++) { 329 connector = fb_helper->connector_info[j]->connector; 330 drm_helper_connector_dpms(connector, dpms_mode); 331 drm_connector_property_set_value(connector, 332 dev->mode_config.dpms_property, dpms_mode); 333 } 334 } 335 mutex_unlock(&dev->mode_config.mutex); 336 } 337 338 int drm_fb_helper_blank(int blank, struct fb_info *info) 339 { 340 switch (blank) { 341 /* Display: On; HSync: On, VSync: On */ 342 case FB_BLANK_UNBLANK: 343 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); 344 break; 345 /* Display: Off; HSync: On, VSync: On */ 346 case FB_BLANK_NORMAL: 347 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 348 break; 349 /* Display: Off; HSync: Off, VSync: On */ 350 case FB_BLANK_HSYNC_SUSPEND: 351 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 352 break; 353 /* Display: Off; HSync: On, VSync: Off */ 354 case FB_BLANK_VSYNC_SUSPEND: 355 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); 356 break; 357 /* Display: Off; HSync: Off, VSync: Off */ 358 case FB_BLANK_POWERDOWN: 359 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); 360 break; 361 } 362 return 0; 363 } 364 EXPORT_SYMBOL(drm_fb_helper_blank); 365 366 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) 367 { 368 int i; 369 370 for (i = 0; i < helper->connector_count; i++) 371 kfree(helper->connector_info[i]); 372 kfree(helper->connector_info); 373 for (i = 0; i < helper->crtc_count; i++) { 374 kfree(helper->crtc_info[i].mode_set.connectors); 375 if (helper->crtc_info[i].mode_set.mode) 376 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode); 377 } 378 kfree(helper->crtc_info); 379 } 380 381 int drm_fb_helper_init(struct drm_device *dev, 382 struct drm_fb_helper *fb_helper, 383 int crtc_count, int max_conn_count) 384 { 385 struct drm_crtc *crtc; 386 int ret = 0; 387 int i; 388 389 fb_helper->dev = dev; 390 391 INIT_LIST_HEAD(&fb_helper->kernel_fb_list); 392 393 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); 394 if (!fb_helper->crtc_info) 395 return -ENOMEM; 396 397 fb_helper->crtc_count = crtc_count; 398 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); 399 if (!fb_helper->connector_info) { 400 kfree(fb_helper->crtc_info); 401 return -ENOMEM; 402 } 403 fb_helper->connector_count = 0; 404 405 for (i = 0; i < crtc_count; i++) { 406 fb_helper->crtc_info[i].mode_set.connectors = 407 kcalloc(max_conn_count, 408 sizeof(struct drm_connector *), 409 GFP_KERNEL); 410 411 if (!fb_helper->crtc_info[i].mode_set.connectors) { 412 ret = -ENOMEM; 413 goto out_free; 414 } 415 fb_helper->crtc_info[i].mode_set.num_connectors = 0; 416 } 417 418 i = 0; 419 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 420 fb_helper->crtc_info[i].mode_set.crtc = crtc; 421 i++; 422 } 423 424 return 0; 425 out_free: 426 drm_fb_helper_crtc_free(fb_helper); 427 return -ENOMEM; 428 } 429 EXPORT_SYMBOL(drm_fb_helper_init); 430 431 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) 432 { 433 if (!list_empty(&fb_helper->kernel_fb_list)) { 434 list_del(&fb_helper->kernel_fb_list); 435 if (list_empty(&kernel_fb_helper_list)) { 436 printk(KERN_INFO "drm: unregistered panic notifier\n"); 437 atomic_notifier_chain_unregister(&panic_notifier_list, 438 &paniced); 439 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 440 } 441 } 442 443 drm_fb_helper_crtc_free(fb_helper); 444 445 } 446 EXPORT_SYMBOL(drm_fb_helper_fini); 447 448 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green, 449 u16 blue, u16 regno, struct fb_info *info) 450 { 451 struct drm_fb_helper *fb_helper = info->par; 452 struct drm_framebuffer *fb = fb_helper->fb; 453 int pindex; 454 455 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 456 u32 *palette; 457 u32 value; 458 /* place color in psuedopalette */ 459 if (regno > 16) 460 return -EINVAL; 461 palette = (u32 *)info->pseudo_palette; 462 red >>= (16 - info->var.red.length); 463 green >>= (16 - info->var.green.length); 464 blue >>= (16 - info->var.blue.length); 465 value = (red << info->var.red.offset) | 466 (green << info->var.green.offset) | 467 (blue << info->var.blue.offset); 468 if (info->var.transp.length > 0) { 469 u32 mask = (1 << info->var.transp.length) - 1; 470 mask <<= info->var.transp.offset; 471 value |= mask; 472 } 473 palette[regno] = value; 474 return 0; 475 } 476 477 pindex = regno; 478 479 if (fb->bits_per_pixel == 16) { 480 pindex = regno << 3; 481 482 if (fb->depth == 16 && regno > 63) 483 return -EINVAL; 484 if (fb->depth == 15 && regno > 31) 485 return -EINVAL; 486 487 if (fb->depth == 16) { 488 u16 r, g, b; 489 int i; 490 if (regno < 32) { 491 for (i = 0; i < 8; i++) 492 fb_helper->funcs->gamma_set(crtc, red, 493 green, blue, pindex + i); 494 } 495 496 fb_helper->funcs->gamma_get(crtc, &r, 497 &g, &b, 498 pindex >> 1); 499 500 for (i = 0; i < 4; i++) 501 fb_helper->funcs->gamma_set(crtc, r, 502 green, b, 503 (pindex >> 1) + i); 504 } 505 } 506 507 if (fb->depth != 16) 508 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex); 509 return 0; 510 } 511 512 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) 513 { 514 struct drm_fb_helper *fb_helper = info->par; 515 struct drm_crtc_helper_funcs *crtc_funcs; 516 u16 *red, *green, *blue, *transp; 517 struct drm_crtc *crtc; 518 int i, j, rc = 0; 519 int start; 520 521 for (i = 0; i < fb_helper->crtc_count; i++) { 522 crtc = fb_helper->crtc_info[i].mode_set.crtc; 523 crtc_funcs = crtc->helper_private; 524 525 red = cmap->red; 526 green = cmap->green; 527 blue = cmap->blue; 528 transp = cmap->transp; 529 start = cmap->start; 530 531 for (j = 0; j < cmap->len; j++) { 532 u16 hred, hgreen, hblue, htransp = 0xffff; 533 534 hred = *red++; 535 hgreen = *green++; 536 hblue = *blue++; 537 538 if (transp) 539 htransp = *transp++; 540 541 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info); 542 if (rc) 543 return rc; 544 } 545 crtc_funcs->load_lut(crtc); 546 } 547 return rc; 548 } 549 EXPORT_SYMBOL(drm_fb_helper_setcmap); 550 551 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 552 struct fb_info *info) 553 { 554 struct drm_fb_helper *fb_helper = info->par; 555 struct drm_framebuffer *fb = fb_helper->fb; 556 int depth; 557 558 if (var->pixclock != 0 || in_dbg_master()) 559 return -EINVAL; 560 561 /* Need to resize the fb object !!! */ 562 if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) { 563 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb " 564 "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel, 565 fb->width, fb->height, fb->bits_per_pixel); 566 return -EINVAL; 567 } 568 569 switch (var->bits_per_pixel) { 570 case 16: 571 depth = (var->green.length == 6) ? 16 : 15; 572 break; 573 case 32: 574 depth = (var->transp.length > 0) ? 32 : 24; 575 break; 576 default: 577 depth = var->bits_per_pixel; 578 break; 579 } 580 581 switch (depth) { 582 case 8: 583 var->red.offset = 0; 584 var->green.offset = 0; 585 var->blue.offset = 0; 586 var->red.length = 8; 587 var->green.length = 8; 588 var->blue.length = 8; 589 var->transp.length = 0; 590 var->transp.offset = 0; 591 break; 592 case 15: 593 var->red.offset = 10; 594 var->green.offset = 5; 595 var->blue.offset = 0; 596 var->red.length = 5; 597 var->green.length = 5; 598 var->blue.length = 5; 599 var->transp.length = 1; 600 var->transp.offset = 15; 601 break; 602 case 16: 603 var->red.offset = 11; 604 var->green.offset = 5; 605 var->blue.offset = 0; 606 var->red.length = 5; 607 var->green.length = 6; 608 var->blue.length = 5; 609 var->transp.length = 0; 610 var->transp.offset = 0; 611 break; 612 case 24: 613 var->red.offset = 16; 614 var->green.offset = 8; 615 var->blue.offset = 0; 616 var->red.length = 8; 617 var->green.length = 8; 618 var->blue.length = 8; 619 var->transp.length = 0; 620 var->transp.offset = 0; 621 break; 622 case 32: 623 var->red.offset = 16; 624 var->green.offset = 8; 625 var->blue.offset = 0; 626 var->red.length = 8; 627 var->green.length = 8; 628 var->blue.length = 8; 629 var->transp.length = 8; 630 var->transp.offset = 24; 631 break; 632 default: 633 return -EINVAL; 634 } 635 return 0; 636 } 637 EXPORT_SYMBOL(drm_fb_helper_check_var); 638 639 /* this will let fbcon do the mode init */ 640 int drm_fb_helper_set_par(struct fb_info *info) 641 { 642 struct drm_fb_helper *fb_helper = info->par; 643 struct drm_device *dev = fb_helper->dev; 644 struct fb_var_screeninfo *var = &info->var; 645 struct drm_crtc *crtc; 646 int ret; 647 int i; 648 649 if (var->pixclock != 0) { 650 DRM_ERROR("PIXEL CLOCK SET\n"); 651 return -EINVAL; 652 } 653 654 mutex_lock(&dev->mode_config.mutex); 655 for (i = 0; i < fb_helper->crtc_count; i++) { 656 crtc = fb_helper->crtc_info[i].mode_set.crtc; 657 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set); 658 if (ret) { 659 mutex_unlock(&dev->mode_config.mutex); 660 return ret; 661 } 662 } 663 mutex_unlock(&dev->mode_config.mutex); 664 665 if (fb_helper->delayed_hotplug) { 666 fb_helper->delayed_hotplug = false; 667 drm_fb_helper_hotplug_event(fb_helper); 668 } 669 return 0; 670 } 671 EXPORT_SYMBOL(drm_fb_helper_set_par); 672 673 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 674 struct fb_info *info) 675 { 676 struct drm_fb_helper *fb_helper = info->par; 677 struct drm_device *dev = fb_helper->dev; 678 struct drm_mode_set *modeset; 679 struct drm_crtc *crtc; 680 int ret = 0; 681 int i; 682 683 mutex_lock(&dev->mode_config.mutex); 684 for (i = 0; i < fb_helper->crtc_count; i++) { 685 crtc = fb_helper->crtc_info[i].mode_set.crtc; 686 687 modeset = &fb_helper->crtc_info[i].mode_set; 688 689 modeset->x = var->xoffset; 690 modeset->y = var->yoffset; 691 692 if (modeset->num_connectors) { 693 ret = crtc->funcs->set_config(modeset); 694 if (!ret) { 695 info->var.xoffset = var->xoffset; 696 info->var.yoffset = var->yoffset; 697 } 698 } 699 } 700 mutex_unlock(&dev->mode_config.mutex); 701 return ret; 702 } 703 EXPORT_SYMBOL(drm_fb_helper_pan_display); 704 705 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, 706 int preferred_bpp) 707 { 708 int new_fb = 0; 709 int crtc_count = 0; 710 int i; 711 struct fb_info *info; 712 struct drm_fb_helper_surface_size sizes; 713 int gamma_size = 0; 714 715 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); 716 sizes.surface_depth = 24; 717 sizes.surface_bpp = 32; 718 sizes.fb_width = (unsigned)-1; 719 sizes.fb_height = (unsigned)-1; 720 721 /* if driver picks 8 or 16 by default use that 722 for both depth/bpp */ 723 if (preferred_bpp != sizes.surface_bpp) { 724 sizes.surface_depth = sizes.surface_bpp = preferred_bpp; 725 } 726 /* first up get a count of crtcs now in use and new min/maxes width/heights */ 727 for (i = 0; i < fb_helper->connector_count; i++) { 728 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; 729 struct drm_cmdline_mode *cmdline_mode; 730 731 cmdline_mode = &fb_helper_conn->cmdline_mode; 732 733 if (cmdline_mode->bpp_specified) { 734 switch (cmdline_mode->bpp) { 735 case 8: 736 sizes.surface_depth = sizes.surface_bpp = 8; 737 break; 738 case 15: 739 sizes.surface_depth = 15; 740 sizes.surface_bpp = 16; 741 break; 742 case 16: 743 sizes.surface_depth = sizes.surface_bpp = 16; 744 break; 745 case 24: 746 sizes.surface_depth = sizes.surface_bpp = 24; 747 break; 748 case 32: 749 sizes.surface_depth = 24; 750 sizes.surface_bpp = 32; 751 break; 752 } 753 break; 754 } 755 } 756 757 crtc_count = 0; 758 for (i = 0; i < fb_helper->crtc_count; i++) { 759 struct drm_display_mode *desired_mode; 760 desired_mode = fb_helper->crtc_info[i].desired_mode; 761 762 if (desired_mode) { 763 if (gamma_size == 0) 764 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; 765 if (desired_mode->hdisplay < sizes.fb_width) 766 sizes.fb_width = desired_mode->hdisplay; 767 if (desired_mode->vdisplay < sizes.fb_height) 768 sizes.fb_height = desired_mode->vdisplay; 769 if (desired_mode->hdisplay > sizes.surface_width) 770 sizes.surface_width = desired_mode->hdisplay; 771 if (desired_mode->vdisplay > sizes.surface_height) 772 sizes.surface_height = desired_mode->vdisplay; 773 crtc_count++; 774 } 775 } 776 777 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { 778 /* hmm everyone went away - assume VGA cable just fell out 779 and will come back later. */ 780 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n"); 781 sizes.fb_width = sizes.surface_width = 1024; 782 sizes.fb_height = sizes.surface_height = 768; 783 } 784 785 /* push down into drivers */ 786 new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); 787 if (new_fb < 0) 788 return new_fb; 789 790 info = fb_helper->fbdev; 791 792 /* set the fb pointer */ 793 for (i = 0; i < fb_helper->crtc_count; i++) { 794 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; 795 } 796 797 if (new_fb) { 798 info->var.pixclock = 0; 799 if (register_framebuffer(info) < 0) { 800 return -EINVAL; 801 } 802 803 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, 804 info->fix.id); 805 806 } else { 807 drm_fb_helper_set_par(info); 808 } 809 810 /* Switch back to kernel console on panic */ 811 /* multi card linked list maybe */ 812 if (list_empty(&kernel_fb_helper_list)) { 813 printk(KERN_INFO "drm: registered panic notifier\n"); 814 atomic_notifier_chain_register(&panic_notifier_list, 815 &paniced); 816 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 817 } 818 if (new_fb) 819 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 820 821 return 0; 822 } 823 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe); 824 825 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 826 uint32_t depth) 827 { 828 info->fix.type = FB_TYPE_PACKED_PIXELS; 829 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : 830 FB_VISUAL_TRUECOLOR; 831 info->fix.mmio_start = 0; 832 info->fix.mmio_len = 0; 833 info->fix.type_aux = 0; 834 info->fix.xpanstep = 1; /* doing it in hw */ 835 info->fix.ypanstep = 1; /* doing it in hw */ 836 info->fix.ywrapstep = 0; 837 info->fix.accel = FB_ACCEL_NONE; 838 info->fix.type_aux = 0; 839 840 info->fix.line_length = pitch; 841 return; 842 } 843 EXPORT_SYMBOL(drm_fb_helper_fill_fix); 844 845 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 846 uint32_t fb_width, uint32_t fb_height) 847 { 848 struct drm_framebuffer *fb = fb_helper->fb; 849 info->pseudo_palette = fb_helper->pseudo_palette; 850 info->var.xres_virtual = fb->width; 851 info->var.yres_virtual = fb->height; 852 info->var.bits_per_pixel = fb->bits_per_pixel; 853 info->var.accel_flags = FB_ACCELF_TEXT; 854 info->var.xoffset = 0; 855 info->var.yoffset = 0; 856 info->var.activate = FB_ACTIVATE_NOW; 857 info->var.height = -1; 858 info->var.width = -1; 859 860 switch (fb->depth) { 861 case 8: 862 info->var.red.offset = 0; 863 info->var.green.offset = 0; 864 info->var.blue.offset = 0; 865 info->var.red.length = 8; /* 8bit DAC */ 866 info->var.green.length = 8; 867 info->var.blue.length = 8; 868 info->var.transp.offset = 0; 869 info->var.transp.length = 0; 870 break; 871 case 15: 872 info->var.red.offset = 10; 873 info->var.green.offset = 5; 874 info->var.blue.offset = 0; 875 info->var.red.length = 5; 876 info->var.green.length = 5; 877 info->var.blue.length = 5; 878 info->var.transp.offset = 15; 879 info->var.transp.length = 1; 880 break; 881 case 16: 882 info->var.red.offset = 11; 883 info->var.green.offset = 5; 884 info->var.blue.offset = 0; 885 info->var.red.length = 5; 886 info->var.green.length = 6; 887 info->var.blue.length = 5; 888 info->var.transp.offset = 0; 889 break; 890 case 24: 891 info->var.red.offset = 16; 892 info->var.green.offset = 8; 893 info->var.blue.offset = 0; 894 info->var.red.length = 8; 895 info->var.green.length = 8; 896 info->var.blue.length = 8; 897 info->var.transp.offset = 0; 898 info->var.transp.length = 0; 899 break; 900 case 32: 901 info->var.red.offset = 16; 902 info->var.green.offset = 8; 903 info->var.blue.offset = 0; 904 info->var.red.length = 8; 905 info->var.green.length = 8; 906 info->var.blue.length = 8; 907 info->var.transp.offset = 24; 908 info->var.transp.length = 8; 909 break; 910 default: 911 break; 912 } 913 914 info->var.xres = fb_width; 915 info->var.yres = fb_height; 916 } 917 EXPORT_SYMBOL(drm_fb_helper_fill_var); 918 919 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, 920 uint32_t maxX, 921 uint32_t maxY) 922 { 923 struct drm_connector *connector; 924 int count = 0; 925 int i; 926 927 for (i = 0; i < fb_helper->connector_count; i++) { 928 connector = fb_helper->connector_info[i]->connector; 929 count += connector->funcs->fill_modes(connector, maxX, maxY); 930 } 931 932 return count; 933 } 934 935 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) 936 { 937 struct drm_display_mode *mode; 938 939 list_for_each_entry(mode, &fb_connector->connector->modes, head) { 940 if (drm_mode_width(mode) > width || 941 drm_mode_height(mode) > height) 942 continue; 943 if (mode->type & DRM_MODE_TYPE_PREFERRED) 944 return mode; 945 } 946 return NULL; 947 } 948 949 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) 950 { 951 struct drm_cmdline_mode *cmdline_mode; 952 cmdline_mode = &fb_connector->cmdline_mode; 953 return cmdline_mode->specified; 954 } 955 956 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 957 int width, int height) 958 { 959 struct drm_cmdline_mode *cmdline_mode; 960 struct drm_display_mode *mode = NULL; 961 962 cmdline_mode = &fb_helper_conn->cmdline_mode; 963 if (cmdline_mode->specified == false) 964 return mode; 965 966 /* attempt to find a matching mode in the list of modes 967 * we have gotten so far, if not add a CVT mode that conforms 968 */ 969 if (cmdline_mode->rb || cmdline_mode->margins) 970 goto create_mode; 971 972 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 973 /* check width/height */ 974 if (mode->hdisplay != cmdline_mode->xres || 975 mode->vdisplay != cmdline_mode->yres) 976 continue; 977 978 if (cmdline_mode->refresh_specified) { 979 if (mode->vrefresh != cmdline_mode->refresh) 980 continue; 981 } 982 983 if (cmdline_mode->interlace) { 984 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) 985 continue; 986 } 987 return mode; 988 } 989 990 create_mode: 991 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, 992 cmdline_mode); 993 list_add(&mode->head, &fb_helper_conn->connector->modes); 994 return mode; 995 } 996 997 static bool drm_connector_enabled(struct drm_connector *connector, bool strict) 998 { 999 bool enable; 1000 1001 if (strict) { 1002 enable = connector->status == connector_status_connected; 1003 } else { 1004 enable = connector->status != connector_status_disconnected; 1005 } 1006 return enable; 1007 } 1008 1009 static void drm_enable_connectors(struct drm_fb_helper *fb_helper, 1010 bool *enabled) 1011 { 1012 bool any_enabled = false; 1013 struct drm_connector *connector; 1014 int i = 0; 1015 1016 for (i = 0; i < fb_helper->connector_count; i++) { 1017 connector = fb_helper->connector_info[i]->connector; 1018 enabled[i] = drm_connector_enabled(connector, true); 1019 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, 1020 enabled[i] ? "yes" : "no"); 1021 any_enabled |= enabled[i]; 1022 } 1023 1024 if (any_enabled) 1025 return; 1026 1027 for (i = 0; i < fb_helper->connector_count; i++) { 1028 connector = fb_helper->connector_info[i]->connector; 1029 enabled[i] = drm_connector_enabled(connector, false); 1030 } 1031 } 1032 1033 static bool drm_target_cloned(struct drm_fb_helper *fb_helper, 1034 struct drm_display_mode **modes, 1035 bool *enabled, int width, int height) 1036 { 1037 int count, i, j; 1038 bool can_clone = false; 1039 struct drm_fb_helper_connector *fb_helper_conn; 1040 struct drm_display_mode *dmt_mode, *mode; 1041 1042 /* only contemplate cloning in the single crtc case */ 1043 if (fb_helper->crtc_count > 1) 1044 return false; 1045 1046 count = 0; 1047 for (i = 0; i < fb_helper->connector_count; i++) { 1048 if (enabled[i]) 1049 count++; 1050 } 1051 1052 /* only contemplate cloning if more than one connector is enabled */ 1053 if (count <= 1) 1054 return false; 1055 1056 /* check the command line or if nothing common pick 1024x768 */ 1057 can_clone = true; 1058 for (i = 0; i < fb_helper->connector_count; i++) { 1059 if (!enabled[i]) 1060 continue; 1061 fb_helper_conn = fb_helper->connector_info[i]; 1062 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1063 if (!modes[i]) { 1064 can_clone = false; 1065 break; 1066 } 1067 for (j = 0; j < i; j++) { 1068 if (!enabled[j]) 1069 continue; 1070 if (!drm_mode_equal(modes[j], modes[i])) 1071 can_clone = false; 1072 } 1073 } 1074 1075 if (can_clone) { 1076 DRM_DEBUG_KMS("can clone using command line\n"); 1077 return true; 1078 } 1079 1080 /* try and find a 1024x768 mode on each connector */ 1081 can_clone = true; 1082 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60); 1083 1084 for (i = 0; i < fb_helper->connector_count; i++) { 1085 1086 if (!enabled[i]) 1087 continue; 1088 1089 fb_helper_conn = fb_helper->connector_info[i]; 1090 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1091 if (drm_mode_equal(mode, dmt_mode)) 1092 modes[i] = mode; 1093 } 1094 if (!modes[i]) 1095 can_clone = false; 1096 } 1097 1098 if (can_clone) { 1099 DRM_DEBUG_KMS("can clone using 1024x768\n"); 1100 return true; 1101 } 1102 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); 1103 return false; 1104 } 1105 1106 static bool drm_target_preferred(struct drm_fb_helper *fb_helper, 1107 struct drm_display_mode **modes, 1108 bool *enabled, int width, int height) 1109 { 1110 struct drm_fb_helper_connector *fb_helper_conn; 1111 int i; 1112 1113 for (i = 0; i < fb_helper->connector_count; i++) { 1114 fb_helper_conn = fb_helper->connector_info[i]; 1115 1116 if (enabled[i] == false) 1117 continue; 1118 1119 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", 1120 fb_helper_conn->connector->base.id); 1121 1122 /* got for command line mode first */ 1123 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1124 if (!modes[i]) { 1125 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n", 1126 fb_helper_conn->connector->base.id); 1127 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); 1128 } 1129 /* No preferred modes, pick one off the list */ 1130 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { 1131 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) 1132 break; 1133 } 1134 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : 1135 "none"); 1136 } 1137 return true; 1138 } 1139 1140 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, 1141 struct drm_fb_helper_crtc **best_crtcs, 1142 struct drm_display_mode **modes, 1143 int n, int width, int height) 1144 { 1145 int c, o; 1146 struct drm_device *dev = fb_helper->dev; 1147 struct drm_connector *connector; 1148 struct drm_connector_helper_funcs *connector_funcs; 1149 struct drm_encoder *encoder; 1150 struct drm_fb_helper_crtc *best_crtc; 1151 int my_score, best_score, score; 1152 struct drm_fb_helper_crtc **crtcs, *crtc; 1153 struct drm_fb_helper_connector *fb_helper_conn; 1154 1155 if (n == fb_helper->connector_count) 1156 return 0; 1157 1158 fb_helper_conn = fb_helper->connector_info[n]; 1159 connector = fb_helper_conn->connector; 1160 1161 best_crtcs[n] = NULL; 1162 best_crtc = NULL; 1163 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); 1164 if (modes[n] == NULL) 1165 return best_score; 1166 1167 crtcs = kzalloc(dev->mode_config.num_connector * 1168 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 1169 if (!crtcs) 1170 return best_score; 1171 1172 my_score = 1; 1173 if (connector->status == connector_status_connected) 1174 my_score++; 1175 if (drm_has_cmdline_mode(fb_helper_conn)) 1176 my_score++; 1177 if (drm_has_preferred_mode(fb_helper_conn, width, height)) 1178 my_score++; 1179 1180 connector_funcs = connector->helper_private; 1181 encoder = connector_funcs->best_encoder(connector); 1182 if (!encoder) 1183 goto out; 1184 1185 /* select a crtc for this connector and then attempt to configure 1186 remaining connectors */ 1187 for (c = 0; c < fb_helper->crtc_count; c++) { 1188 crtc = &fb_helper->crtc_info[c]; 1189 1190 if ((encoder->possible_crtcs & (1 << c)) == 0) { 1191 continue; 1192 } 1193 1194 for (o = 0; o < n; o++) 1195 if (best_crtcs[o] == crtc) 1196 break; 1197 1198 if (o < n) { 1199 /* ignore cloning unless only a single crtc */ 1200 if (fb_helper->crtc_count > 1) 1201 continue; 1202 1203 if (!drm_mode_equal(modes[o], modes[n])) 1204 continue; 1205 } 1206 1207 crtcs[n] = crtc; 1208 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); 1209 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, 1210 width, height); 1211 if (score > best_score) { 1212 best_crtc = crtc; 1213 best_score = score; 1214 memcpy(best_crtcs, crtcs, 1215 dev->mode_config.num_connector * 1216 sizeof(struct drm_fb_helper_crtc *)); 1217 } 1218 } 1219 out: 1220 kfree(crtcs); 1221 return best_score; 1222 } 1223 1224 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) 1225 { 1226 struct drm_device *dev = fb_helper->dev; 1227 struct drm_fb_helper_crtc **crtcs; 1228 struct drm_display_mode **modes; 1229 struct drm_encoder *encoder; 1230 struct drm_mode_set *modeset; 1231 bool *enabled; 1232 int width, height; 1233 int i, ret; 1234 1235 DRM_DEBUG_KMS("\n"); 1236 1237 width = dev->mode_config.max_width; 1238 height = dev->mode_config.max_height; 1239 1240 /* clean out all the encoder/crtc combos */ 1241 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 1242 encoder->crtc = NULL; 1243 } 1244 1245 crtcs = kcalloc(dev->mode_config.num_connector, 1246 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 1247 modes = kcalloc(dev->mode_config.num_connector, 1248 sizeof(struct drm_display_mode *), GFP_KERNEL); 1249 enabled = kcalloc(dev->mode_config.num_connector, 1250 sizeof(bool), GFP_KERNEL); 1251 1252 drm_enable_connectors(fb_helper, enabled); 1253 1254 ret = drm_target_cloned(fb_helper, modes, enabled, width, height); 1255 if (!ret) { 1256 ret = drm_target_preferred(fb_helper, modes, enabled, width, height); 1257 if (!ret) 1258 DRM_ERROR("Unable to find initial modes\n"); 1259 } 1260 1261 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height); 1262 1263 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); 1264 1265 /* need to set the modesets up here for use later */ 1266 /* fill out the connector<->crtc mappings into the modesets */ 1267 for (i = 0; i < fb_helper->crtc_count; i++) { 1268 modeset = &fb_helper->crtc_info[i].mode_set; 1269 modeset->num_connectors = 0; 1270 } 1271 1272 for (i = 0; i < fb_helper->connector_count; i++) { 1273 struct drm_display_mode *mode = modes[i]; 1274 struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; 1275 modeset = &fb_crtc->mode_set; 1276 1277 if (mode && fb_crtc) { 1278 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n", 1279 mode->name, fb_crtc->mode_set.crtc->base.id); 1280 fb_crtc->desired_mode = mode; 1281 if (modeset->mode) 1282 drm_mode_destroy(dev, modeset->mode); 1283 modeset->mode = drm_mode_duplicate(dev, 1284 fb_crtc->desired_mode); 1285 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector; 1286 } 1287 } 1288 1289 kfree(crtcs); 1290 kfree(modes); 1291 kfree(enabled); 1292 } 1293 1294 /** 1295 * drm_helper_initial_config - setup a sane initial connector configuration 1296 * @dev: DRM device 1297 * 1298 * LOCKING: 1299 * Called at init time, must take mode config lock. 1300 * 1301 * Scan the CRTCs and connectors and try to put together an initial setup. 1302 * At the moment, this is a cloned configuration across all heads with 1303 * a new framebuffer object as the backing store. 1304 * 1305 * RETURNS: 1306 * Zero if everything went ok, nonzero otherwise. 1307 */ 1308 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) 1309 { 1310 struct drm_device *dev = fb_helper->dev; 1311 int count = 0; 1312 1313 /* disable all the possible outputs/crtcs before entering KMS mode */ 1314 drm_helper_disable_unused_functions(fb_helper->dev); 1315 1316 drm_fb_helper_parse_command_line(fb_helper); 1317 1318 count = drm_fb_helper_probe_connector_modes(fb_helper, 1319 dev->mode_config.max_width, 1320 dev->mode_config.max_height); 1321 /* 1322 * we shouldn't end up with no modes here. 1323 */ 1324 if (count == 0) { 1325 printk(KERN_INFO "No connectors reported connected with modes\n"); 1326 } 1327 drm_setup_crtcs(fb_helper); 1328 1329 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 1330 } 1331 EXPORT_SYMBOL(drm_fb_helper_initial_config); 1332 1333 /** 1334 * drm_fb_helper_hotplug_event - respond to a hotplug notification by 1335 * probing all the outputs attached to the fb. 1336 * @fb_helper: the drm_fb_helper 1337 * 1338 * LOCKING: 1339 * Called at runtime, must take mode config lock. 1340 * 1341 * Scan the connectors attached to the fb_helper and try to put together a 1342 * setup after *notification of a change in output configuration. 1343 * 1344 * RETURNS: 1345 * 0 on success and a non-zero error code otherwise. 1346 */ 1347 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 1348 { 1349 struct drm_device *dev = fb_helper->dev; 1350 int count = 0; 1351 u32 max_width, max_height, bpp_sel; 1352 bool bound = false, crtcs_bound = false; 1353 struct drm_crtc *crtc; 1354 1355 if (!fb_helper->fb) 1356 return 0; 1357 1358 mutex_lock(&dev->mode_config.mutex); 1359 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 1360 if (crtc->fb) 1361 crtcs_bound = true; 1362 if (crtc->fb == fb_helper->fb) 1363 bound = true; 1364 } 1365 1366 if (!bound && crtcs_bound) { 1367 fb_helper->delayed_hotplug = true; 1368 mutex_unlock(&dev->mode_config.mutex); 1369 return 0; 1370 } 1371 DRM_DEBUG_KMS("\n"); 1372 1373 max_width = fb_helper->fb->width; 1374 max_height = fb_helper->fb->height; 1375 bpp_sel = fb_helper->fb->bits_per_pixel; 1376 1377 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width, 1378 max_height); 1379 drm_setup_crtcs(fb_helper); 1380 mutex_unlock(&dev->mode_config.mutex); 1381 1382 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 1383 } 1384 EXPORT_SYMBOL(drm_fb_helper_hotplug_event); 1385 1386 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) 1387 * but the module doesn't depend on any fb console symbols. At least 1388 * attempt to load fbcon to avoid leaving the system without a usable console. 1389 */ 1390 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) 1391 static int __init drm_fb_helper_modinit(void) 1392 { 1393 const char *name = "fbcon"; 1394 struct module *fbcon; 1395 1396 mutex_lock(&module_mutex); 1397 fbcon = find_module(name); 1398 mutex_unlock(&module_mutex); 1399 1400 if (!fbcon) 1401 request_module_nowait(name); 1402 return 0; 1403 } 1404 1405 module_init(drm_fb_helper_modinit); 1406 #endif 1407