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 if (crtc->funcs->gamma_set == NULL) 140 return; 141 142 r_base = crtc->gamma_store; 143 g_base = r_base + crtc->gamma_size; 144 b_base = g_base + crtc->gamma_size; 145 146 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size); 147 } 148 149 int drm_fb_helper_debug_enter(struct fb_info *info) 150 { 151 struct drm_fb_helper *helper = info->par; 152 struct drm_crtc_helper_funcs *funcs; 153 int i; 154 155 if (list_empty(&kernel_fb_helper_list)) 156 return false; 157 158 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 159 for (i = 0; i < helper->crtc_count; i++) { 160 struct drm_mode_set *mode_set = 161 &helper->crtc_info[i].mode_set; 162 163 if (!mode_set->crtc->enabled) 164 continue; 165 166 funcs = mode_set->crtc->helper_private; 167 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper); 168 funcs->mode_set_base_atomic(mode_set->crtc, 169 mode_set->fb, 170 mode_set->x, 171 mode_set->y, 172 ENTER_ATOMIC_MODE_SET); 173 } 174 } 175 176 return 0; 177 } 178 EXPORT_SYMBOL(drm_fb_helper_debug_enter); 179 180 /* Find the real fb for a given fb helper CRTC */ 181 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc) 182 { 183 struct drm_device *dev = crtc->dev; 184 struct drm_crtc *c; 185 186 list_for_each_entry(c, &dev->mode_config.crtc_list, head) { 187 if (crtc->base.id == c->base.id) 188 return c->fb; 189 } 190 191 return NULL; 192 } 193 194 int drm_fb_helper_debug_leave(struct fb_info *info) 195 { 196 struct drm_fb_helper *helper = info->par; 197 struct drm_crtc *crtc; 198 struct drm_crtc_helper_funcs *funcs; 199 struct drm_framebuffer *fb; 200 int i; 201 202 for (i = 0; i < helper->crtc_count; i++) { 203 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; 204 crtc = mode_set->crtc; 205 funcs = crtc->helper_private; 206 fb = drm_mode_config_fb(crtc); 207 208 if (!crtc->enabled) 209 continue; 210 211 if (!fb) { 212 DRM_ERROR("no fb to restore??\n"); 213 continue; 214 } 215 216 drm_fb_helper_restore_lut_atomic(mode_set->crtc); 217 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, 218 crtc->y, LEAVE_ATOMIC_MODE_SET); 219 } 220 221 return 0; 222 } 223 EXPORT_SYMBOL(drm_fb_helper_debug_leave); 224 225 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper) 226 { 227 bool error = false; 228 int i, ret; 229 for (i = 0; i < fb_helper->crtc_count; i++) { 230 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 231 ret = mode_set->crtc->funcs->set_config(mode_set); 232 if (ret) 233 error = true; 234 } 235 return error; 236 } 237 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode); 238 239 bool drm_fb_helper_force_kernel_mode(void) 240 { 241 bool ret, error = false; 242 struct drm_fb_helper *helper; 243 244 if (list_empty(&kernel_fb_helper_list)) 245 return false; 246 247 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 248 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF) 249 continue; 250 251 ret = drm_fb_helper_restore_fbdev_mode(helper); 252 if (ret) 253 error = true; 254 } 255 return error; 256 } 257 258 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed, 259 void *panic_str) 260 { 261 /* 262 * It's a waste of time and effort to switch back to text console 263 * if the kernel should reboot before panic messages can be seen. 264 */ 265 if (panic_timeout < 0) 266 return 0; 267 268 printk(KERN_ERR "panic occurred, switching back to text console\n"); 269 return drm_fb_helper_force_kernel_mode(); 270 } 271 EXPORT_SYMBOL(drm_fb_helper_panic); 272 273 static struct notifier_block paniced = { 274 .notifier_call = drm_fb_helper_panic, 275 }; 276 277 /** 278 * drm_fb_helper_restore - restore the framebuffer console (kernel) config 279 * 280 * Restore's the kernel's fbcon mode, used for lastclose & panic paths. 281 */ 282 void drm_fb_helper_restore(void) 283 { 284 bool ret; 285 ret = drm_fb_helper_force_kernel_mode(); 286 if (ret == true) 287 DRM_ERROR("Failed to restore crtc configuration\n"); 288 } 289 EXPORT_SYMBOL(drm_fb_helper_restore); 290 291 #ifdef CONFIG_MAGIC_SYSRQ 292 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) 293 { 294 drm_fb_helper_restore(); 295 } 296 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); 297 298 static void drm_fb_helper_sysrq(int dummy1) 299 { 300 schedule_work(&drm_fb_helper_restore_work); 301 } 302 303 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { 304 .handler = drm_fb_helper_sysrq, 305 .help_msg = "force-fb(V)", 306 .action_msg = "Restore framebuffer console", 307 }; 308 #else 309 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; 310 #endif 311 312 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) 313 { 314 struct drm_fb_helper *fb_helper = info->par; 315 struct drm_device *dev = fb_helper->dev; 316 struct drm_crtc *crtc; 317 struct drm_connector *connector; 318 int i, j; 319 320 /* 321 * For each CRTC in this fb, turn the connectors on/off. 322 */ 323 mutex_lock(&dev->mode_config.mutex); 324 for (i = 0; i < fb_helper->crtc_count; i++) { 325 crtc = fb_helper->crtc_info[i].mode_set.crtc; 326 327 if (!crtc->enabled) 328 continue; 329 330 /* Walk the connectors & encoders on this fb turning them on/off */ 331 for (j = 0; j < fb_helper->connector_count; j++) { 332 connector = fb_helper->connector_info[j]->connector; 333 drm_helper_connector_dpms(connector, dpms_mode); 334 drm_connector_property_set_value(connector, 335 dev->mode_config.dpms_property, dpms_mode); 336 } 337 } 338 mutex_unlock(&dev->mode_config.mutex); 339 } 340 341 int drm_fb_helper_blank(int blank, struct fb_info *info) 342 { 343 switch (blank) { 344 /* Display: On; HSync: On, VSync: On */ 345 case FB_BLANK_UNBLANK: 346 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); 347 break; 348 /* Display: Off; HSync: On, VSync: On */ 349 case FB_BLANK_NORMAL: 350 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 351 break; 352 /* Display: Off; HSync: Off, VSync: On */ 353 case FB_BLANK_HSYNC_SUSPEND: 354 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 355 break; 356 /* Display: Off; HSync: On, VSync: Off */ 357 case FB_BLANK_VSYNC_SUSPEND: 358 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); 359 break; 360 /* Display: Off; HSync: Off, VSync: Off */ 361 case FB_BLANK_POWERDOWN: 362 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); 363 break; 364 } 365 return 0; 366 } 367 EXPORT_SYMBOL(drm_fb_helper_blank); 368 369 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) 370 { 371 int i; 372 373 for (i = 0; i < helper->connector_count; i++) 374 kfree(helper->connector_info[i]); 375 kfree(helper->connector_info); 376 for (i = 0; i < helper->crtc_count; i++) { 377 kfree(helper->crtc_info[i].mode_set.connectors); 378 if (helper->crtc_info[i].mode_set.mode) 379 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode); 380 } 381 kfree(helper->crtc_info); 382 } 383 384 int drm_fb_helper_init(struct drm_device *dev, 385 struct drm_fb_helper *fb_helper, 386 int crtc_count, int max_conn_count) 387 { 388 struct drm_crtc *crtc; 389 int i; 390 391 fb_helper->dev = dev; 392 393 INIT_LIST_HEAD(&fb_helper->kernel_fb_list); 394 395 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); 396 if (!fb_helper->crtc_info) 397 return -ENOMEM; 398 399 fb_helper->crtc_count = crtc_count; 400 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); 401 if (!fb_helper->connector_info) { 402 kfree(fb_helper->crtc_info); 403 return -ENOMEM; 404 } 405 fb_helper->connector_count = 0; 406 407 for (i = 0; i < crtc_count; i++) { 408 fb_helper->crtc_info[i].mode_set.connectors = 409 kcalloc(max_conn_count, 410 sizeof(struct drm_connector *), 411 GFP_KERNEL); 412 413 if (!fb_helper->crtc_info[i].mode_set.connectors) 414 goto out_free; 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 || 563 var->xres > fb->width || var->yres > fb->height || 564 var->xres_virtual > fb->width || var->yres_virtual > fb->height) { 565 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb " 566 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", 567 var->xres, var->yres, var->bits_per_pixel, 568 var->xres_virtual, var->yres_virtual, 569 fb->width, fb->height, fb->bits_per_pixel); 570 return -EINVAL; 571 } 572 573 switch (var->bits_per_pixel) { 574 case 16: 575 depth = (var->green.length == 6) ? 16 : 15; 576 break; 577 case 32: 578 depth = (var->transp.length > 0) ? 32 : 24; 579 break; 580 default: 581 depth = var->bits_per_pixel; 582 break; 583 } 584 585 switch (depth) { 586 case 8: 587 var->red.offset = 0; 588 var->green.offset = 0; 589 var->blue.offset = 0; 590 var->red.length = 8; 591 var->green.length = 8; 592 var->blue.length = 8; 593 var->transp.length = 0; 594 var->transp.offset = 0; 595 break; 596 case 15: 597 var->red.offset = 10; 598 var->green.offset = 5; 599 var->blue.offset = 0; 600 var->red.length = 5; 601 var->green.length = 5; 602 var->blue.length = 5; 603 var->transp.length = 1; 604 var->transp.offset = 15; 605 break; 606 case 16: 607 var->red.offset = 11; 608 var->green.offset = 5; 609 var->blue.offset = 0; 610 var->red.length = 5; 611 var->green.length = 6; 612 var->blue.length = 5; 613 var->transp.length = 0; 614 var->transp.offset = 0; 615 break; 616 case 24: 617 var->red.offset = 16; 618 var->green.offset = 8; 619 var->blue.offset = 0; 620 var->red.length = 8; 621 var->green.length = 8; 622 var->blue.length = 8; 623 var->transp.length = 0; 624 var->transp.offset = 0; 625 break; 626 case 32: 627 var->red.offset = 16; 628 var->green.offset = 8; 629 var->blue.offset = 0; 630 var->red.length = 8; 631 var->green.length = 8; 632 var->blue.length = 8; 633 var->transp.length = 8; 634 var->transp.offset = 24; 635 break; 636 default: 637 return -EINVAL; 638 } 639 return 0; 640 } 641 EXPORT_SYMBOL(drm_fb_helper_check_var); 642 643 /* this will let fbcon do the mode init */ 644 int drm_fb_helper_set_par(struct fb_info *info) 645 { 646 struct drm_fb_helper *fb_helper = info->par; 647 struct drm_device *dev = fb_helper->dev; 648 struct fb_var_screeninfo *var = &info->var; 649 struct drm_crtc *crtc; 650 int ret; 651 int i; 652 653 if (var->pixclock != 0) { 654 DRM_ERROR("PIXEL CLOCK SET\n"); 655 return -EINVAL; 656 } 657 658 mutex_lock(&dev->mode_config.mutex); 659 for (i = 0; i < fb_helper->crtc_count; i++) { 660 crtc = fb_helper->crtc_info[i].mode_set.crtc; 661 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set); 662 if (ret) { 663 mutex_unlock(&dev->mode_config.mutex); 664 return ret; 665 } 666 } 667 mutex_unlock(&dev->mode_config.mutex); 668 669 if (fb_helper->delayed_hotplug) { 670 fb_helper->delayed_hotplug = false; 671 drm_fb_helper_hotplug_event(fb_helper); 672 } 673 return 0; 674 } 675 EXPORT_SYMBOL(drm_fb_helper_set_par); 676 677 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 678 struct fb_info *info) 679 { 680 struct drm_fb_helper *fb_helper = info->par; 681 struct drm_device *dev = fb_helper->dev; 682 struct drm_mode_set *modeset; 683 struct drm_crtc *crtc; 684 int ret = 0; 685 int i; 686 687 mutex_lock(&dev->mode_config.mutex); 688 for (i = 0; i < fb_helper->crtc_count; i++) { 689 crtc = fb_helper->crtc_info[i].mode_set.crtc; 690 691 modeset = &fb_helper->crtc_info[i].mode_set; 692 693 modeset->x = var->xoffset; 694 modeset->y = var->yoffset; 695 696 if (modeset->num_connectors) { 697 ret = crtc->funcs->set_config(modeset); 698 if (!ret) { 699 info->var.xoffset = var->xoffset; 700 info->var.yoffset = var->yoffset; 701 } 702 } 703 } 704 mutex_unlock(&dev->mode_config.mutex); 705 return ret; 706 } 707 EXPORT_SYMBOL(drm_fb_helper_pan_display); 708 709 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, 710 int preferred_bpp) 711 { 712 int new_fb = 0; 713 int crtc_count = 0; 714 int i; 715 struct fb_info *info; 716 struct drm_fb_helper_surface_size sizes; 717 int gamma_size = 0; 718 719 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); 720 sizes.surface_depth = 24; 721 sizes.surface_bpp = 32; 722 sizes.fb_width = (unsigned)-1; 723 sizes.fb_height = (unsigned)-1; 724 725 /* if driver picks 8 or 16 by default use that 726 for both depth/bpp */ 727 if (preferred_bpp != sizes.surface_bpp) { 728 sizes.surface_depth = sizes.surface_bpp = preferred_bpp; 729 } 730 /* first up get a count of crtcs now in use and new min/maxes width/heights */ 731 for (i = 0; i < fb_helper->connector_count; i++) { 732 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; 733 struct drm_cmdline_mode *cmdline_mode; 734 735 cmdline_mode = &fb_helper_conn->cmdline_mode; 736 737 if (cmdline_mode->bpp_specified) { 738 switch (cmdline_mode->bpp) { 739 case 8: 740 sizes.surface_depth = sizes.surface_bpp = 8; 741 break; 742 case 15: 743 sizes.surface_depth = 15; 744 sizes.surface_bpp = 16; 745 break; 746 case 16: 747 sizes.surface_depth = sizes.surface_bpp = 16; 748 break; 749 case 24: 750 sizes.surface_depth = sizes.surface_bpp = 24; 751 break; 752 case 32: 753 sizes.surface_depth = 24; 754 sizes.surface_bpp = 32; 755 break; 756 } 757 break; 758 } 759 } 760 761 crtc_count = 0; 762 for (i = 0; i < fb_helper->crtc_count; i++) { 763 struct drm_display_mode *desired_mode; 764 desired_mode = fb_helper->crtc_info[i].desired_mode; 765 766 if (desired_mode) { 767 if (gamma_size == 0) 768 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; 769 if (desired_mode->hdisplay < sizes.fb_width) 770 sizes.fb_width = desired_mode->hdisplay; 771 if (desired_mode->vdisplay < sizes.fb_height) 772 sizes.fb_height = desired_mode->vdisplay; 773 if (desired_mode->hdisplay > sizes.surface_width) 774 sizes.surface_width = desired_mode->hdisplay; 775 if (desired_mode->vdisplay > sizes.surface_height) 776 sizes.surface_height = desired_mode->vdisplay; 777 crtc_count++; 778 } 779 } 780 781 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { 782 /* hmm everyone went away - assume VGA cable just fell out 783 and will come back later. */ 784 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n"); 785 sizes.fb_width = sizes.surface_width = 1024; 786 sizes.fb_height = sizes.surface_height = 768; 787 } 788 789 /* push down into drivers */ 790 new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); 791 if (new_fb < 0) 792 return new_fb; 793 794 info = fb_helper->fbdev; 795 796 /* set the fb pointer */ 797 for (i = 0; i < fb_helper->crtc_count; i++) { 798 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; 799 } 800 801 if (new_fb) { 802 info->var.pixclock = 0; 803 if (register_framebuffer(info) < 0) { 804 return -EINVAL; 805 } 806 807 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, 808 info->fix.id); 809 810 } else { 811 drm_fb_helper_set_par(info); 812 } 813 814 /* Switch back to kernel console on panic */ 815 /* multi card linked list maybe */ 816 if (list_empty(&kernel_fb_helper_list)) { 817 printk(KERN_INFO "drm: registered panic notifier\n"); 818 atomic_notifier_chain_register(&panic_notifier_list, 819 &paniced); 820 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 821 } 822 if (new_fb) 823 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 824 825 return 0; 826 } 827 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe); 828 829 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 830 uint32_t depth) 831 { 832 info->fix.type = FB_TYPE_PACKED_PIXELS; 833 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : 834 FB_VISUAL_TRUECOLOR; 835 info->fix.mmio_start = 0; 836 info->fix.mmio_len = 0; 837 info->fix.type_aux = 0; 838 info->fix.xpanstep = 1; /* doing it in hw */ 839 info->fix.ypanstep = 1; /* doing it in hw */ 840 info->fix.ywrapstep = 0; 841 info->fix.accel = FB_ACCEL_NONE; 842 info->fix.type_aux = 0; 843 844 info->fix.line_length = pitch; 845 return; 846 } 847 EXPORT_SYMBOL(drm_fb_helper_fill_fix); 848 849 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 850 uint32_t fb_width, uint32_t fb_height) 851 { 852 struct drm_framebuffer *fb = fb_helper->fb; 853 info->pseudo_palette = fb_helper->pseudo_palette; 854 info->var.xres_virtual = fb->width; 855 info->var.yres_virtual = fb->height; 856 info->var.bits_per_pixel = fb->bits_per_pixel; 857 info->var.accel_flags = FB_ACCELF_TEXT; 858 info->var.xoffset = 0; 859 info->var.yoffset = 0; 860 info->var.activate = FB_ACTIVATE_NOW; 861 info->var.height = -1; 862 info->var.width = -1; 863 864 switch (fb->depth) { 865 case 8: 866 info->var.red.offset = 0; 867 info->var.green.offset = 0; 868 info->var.blue.offset = 0; 869 info->var.red.length = 8; /* 8bit DAC */ 870 info->var.green.length = 8; 871 info->var.blue.length = 8; 872 info->var.transp.offset = 0; 873 info->var.transp.length = 0; 874 break; 875 case 15: 876 info->var.red.offset = 10; 877 info->var.green.offset = 5; 878 info->var.blue.offset = 0; 879 info->var.red.length = 5; 880 info->var.green.length = 5; 881 info->var.blue.length = 5; 882 info->var.transp.offset = 15; 883 info->var.transp.length = 1; 884 break; 885 case 16: 886 info->var.red.offset = 11; 887 info->var.green.offset = 5; 888 info->var.blue.offset = 0; 889 info->var.red.length = 5; 890 info->var.green.length = 6; 891 info->var.blue.length = 5; 892 info->var.transp.offset = 0; 893 break; 894 case 24: 895 info->var.red.offset = 16; 896 info->var.green.offset = 8; 897 info->var.blue.offset = 0; 898 info->var.red.length = 8; 899 info->var.green.length = 8; 900 info->var.blue.length = 8; 901 info->var.transp.offset = 0; 902 info->var.transp.length = 0; 903 break; 904 case 32: 905 info->var.red.offset = 16; 906 info->var.green.offset = 8; 907 info->var.blue.offset = 0; 908 info->var.red.length = 8; 909 info->var.green.length = 8; 910 info->var.blue.length = 8; 911 info->var.transp.offset = 24; 912 info->var.transp.length = 8; 913 break; 914 default: 915 break; 916 } 917 918 info->var.xres = fb_width; 919 info->var.yres = fb_height; 920 } 921 EXPORT_SYMBOL(drm_fb_helper_fill_var); 922 923 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, 924 uint32_t maxX, 925 uint32_t maxY) 926 { 927 struct drm_connector *connector; 928 int count = 0; 929 int i; 930 931 for (i = 0; i < fb_helper->connector_count; i++) { 932 connector = fb_helper->connector_info[i]->connector; 933 count += connector->funcs->fill_modes(connector, maxX, maxY); 934 } 935 936 return count; 937 } 938 939 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) 940 { 941 struct drm_display_mode *mode; 942 943 list_for_each_entry(mode, &fb_connector->connector->modes, head) { 944 if (drm_mode_width(mode) > width || 945 drm_mode_height(mode) > height) 946 continue; 947 if (mode->type & DRM_MODE_TYPE_PREFERRED) 948 return mode; 949 } 950 return NULL; 951 } 952 953 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) 954 { 955 struct drm_cmdline_mode *cmdline_mode; 956 cmdline_mode = &fb_connector->cmdline_mode; 957 return cmdline_mode->specified; 958 } 959 960 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 961 int width, int height) 962 { 963 struct drm_cmdline_mode *cmdline_mode; 964 struct drm_display_mode *mode = NULL; 965 966 cmdline_mode = &fb_helper_conn->cmdline_mode; 967 if (cmdline_mode->specified == false) 968 return mode; 969 970 /* attempt to find a matching mode in the list of modes 971 * we have gotten so far, if not add a CVT mode that conforms 972 */ 973 if (cmdline_mode->rb || cmdline_mode->margins) 974 goto create_mode; 975 976 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 977 /* check width/height */ 978 if (mode->hdisplay != cmdline_mode->xres || 979 mode->vdisplay != cmdline_mode->yres) 980 continue; 981 982 if (cmdline_mode->refresh_specified) { 983 if (mode->vrefresh != cmdline_mode->refresh) 984 continue; 985 } 986 987 if (cmdline_mode->interlace) { 988 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) 989 continue; 990 } 991 return mode; 992 } 993 994 create_mode: 995 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, 996 cmdline_mode); 997 list_add(&mode->head, &fb_helper_conn->connector->modes); 998 return mode; 999 } 1000 1001 static bool drm_connector_enabled(struct drm_connector *connector, bool strict) 1002 { 1003 bool enable; 1004 1005 if (strict) { 1006 enable = connector->status == connector_status_connected; 1007 } else { 1008 enable = connector->status != connector_status_disconnected; 1009 } 1010 return enable; 1011 } 1012 1013 static void drm_enable_connectors(struct drm_fb_helper *fb_helper, 1014 bool *enabled) 1015 { 1016 bool any_enabled = false; 1017 struct drm_connector *connector; 1018 int i = 0; 1019 1020 for (i = 0; i < fb_helper->connector_count; i++) { 1021 connector = fb_helper->connector_info[i]->connector; 1022 enabled[i] = drm_connector_enabled(connector, true); 1023 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, 1024 enabled[i] ? "yes" : "no"); 1025 any_enabled |= enabled[i]; 1026 } 1027 1028 if (any_enabled) 1029 return; 1030 1031 for (i = 0; i < fb_helper->connector_count; i++) { 1032 connector = fb_helper->connector_info[i]->connector; 1033 enabled[i] = drm_connector_enabled(connector, false); 1034 } 1035 } 1036 1037 static bool drm_target_cloned(struct drm_fb_helper *fb_helper, 1038 struct drm_display_mode **modes, 1039 bool *enabled, int width, int height) 1040 { 1041 int count, i, j; 1042 bool can_clone = false; 1043 struct drm_fb_helper_connector *fb_helper_conn; 1044 struct drm_display_mode *dmt_mode, *mode; 1045 1046 /* only contemplate cloning in the single crtc case */ 1047 if (fb_helper->crtc_count > 1) 1048 return false; 1049 1050 count = 0; 1051 for (i = 0; i < fb_helper->connector_count; i++) { 1052 if (enabled[i]) 1053 count++; 1054 } 1055 1056 /* only contemplate cloning if more than one connector is enabled */ 1057 if (count <= 1) 1058 return false; 1059 1060 /* check the command line or if nothing common pick 1024x768 */ 1061 can_clone = true; 1062 for (i = 0; i < fb_helper->connector_count; i++) { 1063 if (!enabled[i]) 1064 continue; 1065 fb_helper_conn = fb_helper->connector_info[i]; 1066 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1067 if (!modes[i]) { 1068 can_clone = false; 1069 break; 1070 } 1071 for (j = 0; j < i; j++) { 1072 if (!enabled[j]) 1073 continue; 1074 if (!drm_mode_equal(modes[j], modes[i])) 1075 can_clone = false; 1076 } 1077 } 1078 1079 if (can_clone) { 1080 DRM_DEBUG_KMS("can clone using command line\n"); 1081 return true; 1082 } 1083 1084 /* try and find a 1024x768 mode on each connector */ 1085 can_clone = true; 1086 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false); 1087 1088 for (i = 0; i < fb_helper->connector_count; i++) { 1089 1090 if (!enabled[i]) 1091 continue; 1092 1093 fb_helper_conn = fb_helper->connector_info[i]; 1094 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1095 if (drm_mode_equal(mode, dmt_mode)) 1096 modes[i] = mode; 1097 } 1098 if (!modes[i]) 1099 can_clone = false; 1100 } 1101 1102 if (can_clone) { 1103 DRM_DEBUG_KMS("can clone using 1024x768\n"); 1104 return true; 1105 } 1106 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); 1107 return false; 1108 } 1109 1110 static bool drm_target_preferred(struct drm_fb_helper *fb_helper, 1111 struct drm_display_mode **modes, 1112 bool *enabled, int width, int height) 1113 { 1114 struct drm_fb_helper_connector *fb_helper_conn; 1115 int i; 1116 1117 for (i = 0; i < fb_helper->connector_count; i++) { 1118 fb_helper_conn = fb_helper->connector_info[i]; 1119 1120 if (enabled[i] == false) 1121 continue; 1122 1123 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", 1124 fb_helper_conn->connector->base.id); 1125 1126 /* got for command line mode first */ 1127 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1128 if (!modes[i]) { 1129 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n", 1130 fb_helper_conn->connector->base.id); 1131 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); 1132 } 1133 /* No preferred modes, pick one off the list */ 1134 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { 1135 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) 1136 break; 1137 } 1138 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : 1139 "none"); 1140 } 1141 return true; 1142 } 1143 1144 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, 1145 struct drm_fb_helper_crtc **best_crtcs, 1146 struct drm_display_mode **modes, 1147 int n, int width, int height) 1148 { 1149 int c, o; 1150 struct drm_device *dev = fb_helper->dev; 1151 struct drm_connector *connector; 1152 struct drm_connector_helper_funcs *connector_funcs; 1153 struct drm_encoder *encoder; 1154 struct drm_fb_helper_crtc *best_crtc; 1155 int my_score, best_score, score; 1156 struct drm_fb_helper_crtc **crtcs, *crtc; 1157 struct drm_fb_helper_connector *fb_helper_conn; 1158 1159 if (n == fb_helper->connector_count) 1160 return 0; 1161 1162 fb_helper_conn = fb_helper->connector_info[n]; 1163 connector = fb_helper_conn->connector; 1164 1165 best_crtcs[n] = NULL; 1166 best_crtc = NULL; 1167 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); 1168 if (modes[n] == NULL) 1169 return best_score; 1170 1171 crtcs = kzalloc(dev->mode_config.num_connector * 1172 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 1173 if (!crtcs) 1174 return best_score; 1175 1176 my_score = 1; 1177 if (connector->status == connector_status_connected) 1178 my_score++; 1179 if (drm_has_cmdline_mode(fb_helper_conn)) 1180 my_score++; 1181 if (drm_has_preferred_mode(fb_helper_conn, width, height)) 1182 my_score++; 1183 1184 connector_funcs = connector->helper_private; 1185 encoder = connector_funcs->best_encoder(connector); 1186 if (!encoder) 1187 goto out; 1188 1189 /* select a crtc for this connector and then attempt to configure 1190 remaining connectors */ 1191 for (c = 0; c < fb_helper->crtc_count; c++) { 1192 crtc = &fb_helper->crtc_info[c]; 1193 1194 if ((encoder->possible_crtcs & (1 << c)) == 0) { 1195 continue; 1196 } 1197 1198 for (o = 0; o < n; o++) 1199 if (best_crtcs[o] == crtc) 1200 break; 1201 1202 if (o < n) { 1203 /* ignore cloning unless only a single crtc */ 1204 if (fb_helper->crtc_count > 1) 1205 continue; 1206 1207 if (!drm_mode_equal(modes[o], modes[n])) 1208 continue; 1209 } 1210 1211 crtcs[n] = crtc; 1212 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); 1213 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, 1214 width, height); 1215 if (score > best_score) { 1216 best_crtc = crtc; 1217 best_score = score; 1218 memcpy(best_crtcs, crtcs, 1219 dev->mode_config.num_connector * 1220 sizeof(struct drm_fb_helper_crtc *)); 1221 } 1222 } 1223 out: 1224 kfree(crtcs); 1225 return best_score; 1226 } 1227 1228 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) 1229 { 1230 struct drm_device *dev = fb_helper->dev; 1231 struct drm_fb_helper_crtc **crtcs; 1232 struct drm_display_mode **modes; 1233 struct drm_encoder *encoder; 1234 struct drm_mode_set *modeset; 1235 bool *enabled; 1236 int width, height; 1237 int i, ret; 1238 1239 DRM_DEBUG_KMS("\n"); 1240 1241 width = dev->mode_config.max_width; 1242 height = dev->mode_config.max_height; 1243 1244 /* clean out all the encoder/crtc combos */ 1245 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 1246 encoder->crtc = NULL; 1247 } 1248 1249 crtcs = kcalloc(dev->mode_config.num_connector, 1250 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 1251 modes = kcalloc(dev->mode_config.num_connector, 1252 sizeof(struct drm_display_mode *), GFP_KERNEL); 1253 enabled = kcalloc(dev->mode_config.num_connector, 1254 sizeof(bool), GFP_KERNEL); 1255 1256 drm_enable_connectors(fb_helper, enabled); 1257 1258 ret = drm_target_cloned(fb_helper, modes, enabled, width, height); 1259 if (!ret) { 1260 ret = drm_target_preferred(fb_helper, modes, enabled, width, height); 1261 if (!ret) 1262 DRM_ERROR("Unable to find initial modes\n"); 1263 } 1264 1265 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height); 1266 1267 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); 1268 1269 /* need to set the modesets up here for use later */ 1270 /* fill out the connector<->crtc mappings into the modesets */ 1271 for (i = 0; i < fb_helper->crtc_count; i++) { 1272 modeset = &fb_helper->crtc_info[i].mode_set; 1273 modeset->num_connectors = 0; 1274 } 1275 1276 for (i = 0; i < fb_helper->connector_count; i++) { 1277 struct drm_display_mode *mode = modes[i]; 1278 struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; 1279 modeset = &fb_crtc->mode_set; 1280 1281 if (mode && fb_crtc) { 1282 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n", 1283 mode->name, fb_crtc->mode_set.crtc->base.id); 1284 fb_crtc->desired_mode = mode; 1285 if (modeset->mode) 1286 drm_mode_destroy(dev, modeset->mode); 1287 modeset->mode = drm_mode_duplicate(dev, 1288 fb_crtc->desired_mode); 1289 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector; 1290 } 1291 } 1292 1293 kfree(crtcs); 1294 kfree(modes); 1295 kfree(enabled); 1296 } 1297 1298 /** 1299 * drm_helper_initial_config - setup a sane initial connector configuration 1300 * @dev: DRM device 1301 * 1302 * LOCKING: 1303 * Called at init time, must take mode config lock. 1304 * 1305 * Scan the CRTCs and connectors and try to put together an initial setup. 1306 * At the moment, this is a cloned configuration across all heads with 1307 * a new framebuffer object as the backing store. 1308 * 1309 * RETURNS: 1310 * Zero if everything went ok, nonzero otherwise. 1311 */ 1312 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) 1313 { 1314 struct drm_device *dev = fb_helper->dev; 1315 int count = 0; 1316 1317 /* disable all the possible outputs/crtcs before entering KMS mode */ 1318 drm_helper_disable_unused_functions(fb_helper->dev); 1319 1320 drm_fb_helper_parse_command_line(fb_helper); 1321 1322 count = drm_fb_helper_probe_connector_modes(fb_helper, 1323 dev->mode_config.max_width, 1324 dev->mode_config.max_height); 1325 /* 1326 * we shouldn't end up with no modes here. 1327 */ 1328 if (count == 0) { 1329 printk(KERN_INFO "No connectors reported connected with modes\n"); 1330 } 1331 drm_setup_crtcs(fb_helper); 1332 1333 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 1334 } 1335 EXPORT_SYMBOL(drm_fb_helper_initial_config); 1336 1337 /** 1338 * drm_fb_helper_hotplug_event - respond to a hotplug notification by 1339 * probing all the outputs attached to the fb. 1340 * @fb_helper: the drm_fb_helper 1341 * 1342 * LOCKING: 1343 * Called at runtime, must take mode config lock. 1344 * 1345 * Scan the connectors attached to the fb_helper and try to put together a 1346 * setup after *notification of a change in output configuration. 1347 * 1348 * RETURNS: 1349 * 0 on success and a non-zero error code otherwise. 1350 */ 1351 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 1352 { 1353 struct drm_device *dev = fb_helper->dev; 1354 int count = 0; 1355 u32 max_width, max_height, bpp_sel; 1356 int bound = 0, crtcs_bound = 0; 1357 struct drm_crtc *crtc; 1358 1359 if (!fb_helper->fb) 1360 return 0; 1361 1362 mutex_lock(&dev->mode_config.mutex); 1363 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 1364 if (crtc->fb) 1365 crtcs_bound++; 1366 if (crtc->fb == fb_helper->fb) 1367 bound++; 1368 } 1369 1370 if (bound < crtcs_bound) { 1371 fb_helper->delayed_hotplug = true; 1372 mutex_unlock(&dev->mode_config.mutex); 1373 return 0; 1374 } 1375 DRM_DEBUG_KMS("\n"); 1376 1377 max_width = fb_helper->fb->width; 1378 max_height = fb_helper->fb->height; 1379 bpp_sel = fb_helper->fb->bits_per_pixel; 1380 1381 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width, 1382 max_height); 1383 drm_setup_crtcs(fb_helper); 1384 mutex_unlock(&dev->mode_config.mutex); 1385 1386 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 1387 } 1388 EXPORT_SYMBOL(drm_fb_helper_hotplug_event); 1389 1390 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) 1391 * but the module doesn't depend on any fb console symbols. At least 1392 * attempt to load fbcon to avoid leaving the system without a usable console. 1393 */ 1394 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) 1395 static int __init drm_fb_helper_modinit(void) 1396 { 1397 const char *name = "fbcon"; 1398 struct module *fbcon; 1399 1400 mutex_lock(&module_mutex); 1401 fbcon = find_module(name); 1402 mutex_unlock(&module_mutex); 1403 1404 if (!fbcon) 1405 request_module_nowait(name); 1406 return 0; 1407 } 1408 1409 module_init(drm_fb_helper_modinit); 1410 #endif 1411