1 /* 2 * Copyright (c) 2006-2009 Red Hat Inc. 3 * Copyright (c) 2006-2008 Intel Corporation 4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> 5 * 6 * DRM framebuffer helper functions 7 * 8 * Permission to use, copy, modify, distribute, and sell this software and its 9 * documentation for any purpose is hereby granted without fee, provided that 10 * the above copyright notice appear in all copies and that both that copyright 11 * notice and this permission notice appear in supporting documentation, and 12 * that the name of the copyright holders not be used in advertising or 13 * publicity pertaining to distribution of the software without specific, 14 * written prior permission. The copyright holders make no representations 15 * about the suitability of this software for any purpose. It is provided "as 16 * is" without express or implied warranty. 17 * 18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 24 * OF THIS SOFTWARE. 25 * 26 * Authors: 27 * Dave Airlie <airlied@linux.ie> 28 * Jesse Barnes <jesse.barnes@intel.com> 29 */ 30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 31 32 #include <linux/kernel.h> 33 #include <linux/sysrq.h> 34 #include <linux/slab.h> 35 #include <linux/fb.h> 36 #include <linux/module.h> 37 #include <drm/drmP.h> 38 #include <drm/drm_crtc.h> 39 #include <drm/drm_fb_helper.h> 40 #include <drm/drm_crtc_helper.h> 41 42 MODULE_AUTHOR("David Airlie, Jesse Barnes"); 43 MODULE_DESCRIPTION("DRM KMS helper"); 44 MODULE_LICENSE("GPL and additional rights"); 45 46 static LIST_HEAD(kernel_fb_helper_list); 47 48 /** 49 * DOC: fbdev helpers 50 * 51 * The fb helper functions are useful to provide an fbdev on top of a drm kernel 52 * mode setting driver. They can be used mostly independantely from the crtc 53 * helper functions used by many drivers to implement the kernel mode setting 54 * interfaces. 55 */ 56 57 /* simple single crtc case helper function */ 58 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) 59 { 60 struct drm_device *dev = fb_helper->dev; 61 struct drm_connector *connector; 62 int i; 63 64 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 65 struct drm_fb_helper_connector *fb_helper_connector; 66 67 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL); 68 if (!fb_helper_connector) 69 goto fail; 70 71 fb_helper_connector->connector = connector; 72 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; 73 } 74 return 0; 75 fail: 76 for (i = 0; i < fb_helper->connector_count; i++) { 77 kfree(fb_helper->connector_info[i]); 78 fb_helper->connector_info[i] = NULL; 79 } 80 fb_helper->connector_count = 0; 81 return -ENOMEM; 82 } 83 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); 84 85 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper) 86 { 87 struct drm_fb_helper_connector *fb_helper_conn; 88 int i; 89 90 for (i = 0; i < fb_helper->connector_count; i++) { 91 struct drm_cmdline_mode *mode; 92 struct drm_connector *connector; 93 char *option = NULL; 94 95 fb_helper_conn = fb_helper->connector_info[i]; 96 connector = fb_helper_conn->connector; 97 mode = &fb_helper_conn->cmdline_mode; 98 99 /* do something on return - turn off connector maybe */ 100 if (fb_get_options(drm_get_connector_name(connector), &option)) 101 continue; 102 103 if (drm_mode_parse_command_line_for_connector(option, 104 connector, 105 mode)) { 106 if (mode->force) { 107 const char *s; 108 switch (mode->force) { 109 case DRM_FORCE_OFF: 110 s = "OFF"; 111 break; 112 case DRM_FORCE_ON_DIGITAL: 113 s = "ON - dig"; 114 break; 115 default: 116 case DRM_FORCE_ON: 117 s = "ON"; 118 break; 119 } 120 121 DRM_INFO("forcing %s connector %s\n", 122 drm_get_connector_name(connector), s); 123 connector->force = mode->force; 124 } 125 126 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n", 127 drm_get_connector_name(connector), 128 mode->xres, mode->yres, 129 mode->refresh_specified ? mode->refresh : 60, 130 mode->rb ? " reduced blanking" : "", 131 mode->margins ? " with margins" : "", 132 mode->interlace ? " interlaced" : ""); 133 } 134 135 } 136 return 0; 137 } 138 139 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper) 140 { 141 uint16_t *r_base, *g_base, *b_base; 142 int i; 143 144 r_base = crtc->gamma_store; 145 g_base = r_base + crtc->gamma_size; 146 b_base = g_base + crtc->gamma_size; 147 148 for (i = 0; i < crtc->gamma_size; i++) 149 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i); 150 } 151 152 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc) 153 { 154 uint16_t *r_base, *g_base, *b_base; 155 156 if (crtc->funcs->gamma_set == NULL) 157 return; 158 159 r_base = crtc->gamma_store; 160 g_base = r_base + crtc->gamma_size; 161 b_base = g_base + crtc->gamma_size; 162 163 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size); 164 } 165 166 int drm_fb_helper_debug_enter(struct fb_info *info) 167 { 168 struct drm_fb_helper *helper = info->par; 169 struct drm_crtc_helper_funcs *funcs; 170 int i; 171 172 if (list_empty(&kernel_fb_helper_list)) 173 return false; 174 175 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 176 for (i = 0; i < helper->crtc_count; i++) { 177 struct drm_mode_set *mode_set = 178 &helper->crtc_info[i].mode_set; 179 180 if (!mode_set->crtc->enabled) 181 continue; 182 183 funcs = mode_set->crtc->helper_private; 184 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper); 185 funcs->mode_set_base_atomic(mode_set->crtc, 186 mode_set->fb, 187 mode_set->x, 188 mode_set->y, 189 ENTER_ATOMIC_MODE_SET); 190 } 191 } 192 193 return 0; 194 } 195 EXPORT_SYMBOL(drm_fb_helper_debug_enter); 196 197 /* Find the real fb for a given fb helper CRTC */ 198 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc) 199 { 200 struct drm_device *dev = crtc->dev; 201 struct drm_crtc *c; 202 203 list_for_each_entry(c, &dev->mode_config.crtc_list, head) { 204 if (crtc->base.id == c->base.id) 205 return c->fb; 206 } 207 208 return NULL; 209 } 210 211 int drm_fb_helper_debug_leave(struct fb_info *info) 212 { 213 struct drm_fb_helper *helper = info->par; 214 struct drm_crtc *crtc; 215 struct drm_crtc_helper_funcs *funcs; 216 struct drm_framebuffer *fb; 217 int i; 218 219 for (i = 0; i < helper->crtc_count; i++) { 220 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; 221 crtc = mode_set->crtc; 222 funcs = crtc->helper_private; 223 fb = drm_mode_config_fb(crtc); 224 225 if (!crtc->enabled) 226 continue; 227 228 if (!fb) { 229 DRM_ERROR("no fb to restore??\n"); 230 continue; 231 } 232 233 drm_fb_helper_restore_lut_atomic(mode_set->crtc); 234 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, 235 crtc->y, LEAVE_ATOMIC_MODE_SET); 236 } 237 238 return 0; 239 } 240 EXPORT_SYMBOL(drm_fb_helper_debug_leave); 241 242 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper) 243 { 244 bool error = false; 245 int i, ret; 246 for (i = 0; i < fb_helper->crtc_count; i++) { 247 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; 248 ret = mode_set->crtc->funcs->set_config(mode_set); 249 if (ret) 250 error = true; 251 } 252 return error; 253 } 254 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode); 255 256 static bool drm_fb_helper_force_kernel_mode(void) 257 { 258 bool ret, error = false; 259 struct drm_fb_helper *helper; 260 261 if (list_empty(&kernel_fb_helper_list)) 262 return false; 263 264 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 265 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF) 266 continue; 267 268 ret = drm_fb_helper_restore_fbdev_mode(helper); 269 if (ret) 270 error = true; 271 } 272 return error; 273 } 274 275 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed, 276 void *panic_str) 277 { 278 /* 279 * It's a waste of time and effort to switch back to text console 280 * if the kernel should reboot before panic messages can be seen. 281 */ 282 if (panic_timeout < 0) 283 return 0; 284 285 pr_err("panic occurred, switching back to text console\n"); 286 return drm_fb_helper_force_kernel_mode(); 287 } 288 EXPORT_SYMBOL(drm_fb_helper_panic); 289 290 static struct notifier_block paniced = { 291 .notifier_call = drm_fb_helper_panic, 292 }; 293 294 /** 295 * drm_fb_helper_restore - restore the framebuffer console (kernel) config 296 * 297 * Restore's the kernel's fbcon mode, used for lastclose & panic paths. 298 */ 299 void drm_fb_helper_restore(void) 300 { 301 bool ret; 302 ret = drm_fb_helper_force_kernel_mode(); 303 if (ret == true) 304 DRM_ERROR("Failed to restore crtc configuration\n"); 305 } 306 EXPORT_SYMBOL(drm_fb_helper_restore); 307 308 #ifdef CONFIG_MAGIC_SYSRQ 309 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) 310 { 311 drm_fb_helper_restore(); 312 } 313 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); 314 315 static void drm_fb_helper_sysrq(int dummy1) 316 { 317 schedule_work(&drm_fb_helper_restore_work); 318 } 319 320 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { 321 .handler = drm_fb_helper_sysrq, 322 .help_msg = "force-fb(V)", 323 .action_msg = "Restore framebuffer console", 324 }; 325 #else 326 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; 327 #endif 328 329 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) 330 { 331 struct drm_fb_helper *fb_helper = info->par; 332 struct drm_device *dev = fb_helper->dev; 333 struct drm_crtc *crtc; 334 struct drm_connector *connector; 335 int i, j; 336 337 /* 338 * For each CRTC in this fb, turn the connectors on/off. 339 */ 340 mutex_lock(&dev->mode_config.mutex); 341 for (i = 0; i < fb_helper->crtc_count; i++) { 342 crtc = fb_helper->crtc_info[i].mode_set.crtc; 343 344 if (!crtc->enabled) 345 continue; 346 347 /* Walk the connectors & encoders on this fb turning them on/off */ 348 for (j = 0; j < fb_helper->connector_count; j++) { 349 connector = fb_helper->connector_info[j]->connector; 350 connector->funcs->dpms(connector, dpms_mode); 351 drm_object_property_set_value(&connector->base, 352 dev->mode_config.dpms_property, dpms_mode); 353 } 354 } 355 mutex_unlock(&dev->mode_config.mutex); 356 } 357 358 int drm_fb_helper_blank(int blank, struct fb_info *info) 359 { 360 switch (blank) { 361 /* Display: On; HSync: On, VSync: On */ 362 case FB_BLANK_UNBLANK: 363 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); 364 break; 365 /* Display: Off; HSync: On, VSync: On */ 366 case FB_BLANK_NORMAL: 367 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 368 break; 369 /* Display: Off; HSync: Off, VSync: On */ 370 case FB_BLANK_HSYNC_SUSPEND: 371 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 372 break; 373 /* Display: Off; HSync: On, VSync: Off */ 374 case FB_BLANK_VSYNC_SUSPEND: 375 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); 376 break; 377 /* Display: Off; HSync: Off, VSync: Off */ 378 case FB_BLANK_POWERDOWN: 379 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); 380 break; 381 } 382 return 0; 383 } 384 EXPORT_SYMBOL(drm_fb_helper_blank); 385 386 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) 387 { 388 int i; 389 390 for (i = 0; i < helper->connector_count; i++) 391 kfree(helper->connector_info[i]); 392 kfree(helper->connector_info); 393 for (i = 0; i < helper->crtc_count; i++) { 394 kfree(helper->crtc_info[i].mode_set.connectors); 395 if (helper->crtc_info[i].mode_set.mode) 396 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode); 397 } 398 kfree(helper->crtc_info); 399 } 400 401 int drm_fb_helper_init(struct drm_device *dev, 402 struct drm_fb_helper *fb_helper, 403 int crtc_count, int max_conn_count) 404 { 405 struct drm_crtc *crtc; 406 int i; 407 408 fb_helper->dev = dev; 409 410 INIT_LIST_HEAD(&fb_helper->kernel_fb_list); 411 412 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); 413 if (!fb_helper->crtc_info) 414 return -ENOMEM; 415 416 fb_helper->crtc_count = crtc_count; 417 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); 418 if (!fb_helper->connector_info) { 419 kfree(fb_helper->crtc_info); 420 return -ENOMEM; 421 } 422 fb_helper->connector_count = 0; 423 424 for (i = 0; i < crtc_count; i++) { 425 fb_helper->crtc_info[i].mode_set.connectors = 426 kcalloc(max_conn_count, 427 sizeof(struct drm_connector *), 428 GFP_KERNEL); 429 430 if (!fb_helper->crtc_info[i].mode_set.connectors) 431 goto out_free; 432 fb_helper->crtc_info[i].mode_set.num_connectors = 0; 433 } 434 435 i = 0; 436 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 437 fb_helper->crtc_info[i].mode_set.crtc = crtc; 438 i++; 439 } 440 441 return 0; 442 out_free: 443 drm_fb_helper_crtc_free(fb_helper); 444 return -ENOMEM; 445 } 446 EXPORT_SYMBOL(drm_fb_helper_init); 447 448 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) 449 { 450 if (!list_empty(&fb_helper->kernel_fb_list)) { 451 list_del(&fb_helper->kernel_fb_list); 452 if (list_empty(&kernel_fb_helper_list)) { 453 pr_info("drm: unregistered panic notifier\n"); 454 atomic_notifier_chain_unregister(&panic_notifier_list, 455 &paniced); 456 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 457 } 458 } 459 460 drm_fb_helper_crtc_free(fb_helper); 461 462 } 463 EXPORT_SYMBOL(drm_fb_helper_fini); 464 465 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green, 466 u16 blue, u16 regno, struct fb_info *info) 467 { 468 struct drm_fb_helper *fb_helper = info->par; 469 struct drm_framebuffer *fb = fb_helper->fb; 470 int pindex; 471 472 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 473 u32 *palette; 474 u32 value; 475 /* place color in psuedopalette */ 476 if (regno > 16) 477 return -EINVAL; 478 palette = (u32 *)info->pseudo_palette; 479 red >>= (16 - info->var.red.length); 480 green >>= (16 - info->var.green.length); 481 blue >>= (16 - info->var.blue.length); 482 value = (red << info->var.red.offset) | 483 (green << info->var.green.offset) | 484 (blue << info->var.blue.offset); 485 if (info->var.transp.length > 0) { 486 u32 mask = (1 << info->var.transp.length) - 1; 487 mask <<= info->var.transp.offset; 488 value |= mask; 489 } 490 palette[regno] = value; 491 return 0; 492 } 493 494 pindex = regno; 495 496 if (fb->bits_per_pixel == 16) { 497 pindex = regno << 3; 498 499 if (fb->depth == 16 && regno > 63) 500 return -EINVAL; 501 if (fb->depth == 15 && regno > 31) 502 return -EINVAL; 503 504 if (fb->depth == 16) { 505 u16 r, g, b; 506 int i; 507 if (regno < 32) { 508 for (i = 0; i < 8; i++) 509 fb_helper->funcs->gamma_set(crtc, red, 510 green, blue, pindex + i); 511 } 512 513 fb_helper->funcs->gamma_get(crtc, &r, 514 &g, &b, 515 pindex >> 1); 516 517 for (i = 0; i < 4; i++) 518 fb_helper->funcs->gamma_set(crtc, r, 519 green, b, 520 (pindex >> 1) + i); 521 } 522 } 523 524 if (fb->depth != 16) 525 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex); 526 return 0; 527 } 528 529 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) 530 { 531 struct drm_fb_helper *fb_helper = info->par; 532 struct drm_crtc_helper_funcs *crtc_funcs; 533 u16 *red, *green, *blue, *transp; 534 struct drm_crtc *crtc; 535 int i, j, rc = 0; 536 int start; 537 538 for (i = 0; i < fb_helper->crtc_count; i++) { 539 crtc = fb_helper->crtc_info[i].mode_set.crtc; 540 crtc_funcs = crtc->helper_private; 541 542 red = cmap->red; 543 green = cmap->green; 544 blue = cmap->blue; 545 transp = cmap->transp; 546 start = cmap->start; 547 548 for (j = 0; j < cmap->len; j++) { 549 u16 hred, hgreen, hblue, htransp = 0xffff; 550 551 hred = *red++; 552 hgreen = *green++; 553 hblue = *blue++; 554 555 if (transp) 556 htransp = *transp++; 557 558 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info); 559 if (rc) 560 return rc; 561 } 562 crtc_funcs->load_lut(crtc); 563 } 564 return rc; 565 } 566 EXPORT_SYMBOL(drm_fb_helper_setcmap); 567 568 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 569 struct fb_info *info) 570 { 571 struct drm_fb_helper *fb_helper = info->par; 572 struct drm_framebuffer *fb = fb_helper->fb; 573 int depth; 574 575 if (var->pixclock != 0 || in_dbg_master()) 576 return -EINVAL; 577 578 /* Need to resize the fb object !!! */ 579 if (var->bits_per_pixel > fb->bits_per_pixel || 580 var->xres > fb->width || var->yres > fb->height || 581 var->xres_virtual > fb->width || var->yres_virtual > fb->height) { 582 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb " 583 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", 584 var->xres, var->yres, var->bits_per_pixel, 585 var->xres_virtual, var->yres_virtual, 586 fb->width, fb->height, fb->bits_per_pixel); 587 return -EINVAL; 588 } 589 590 switch (var->bits_per_pixel) { 591 case 16: 592 depth = (var->green.length == 6) ? 16 : 15; 593 break; 594 case 32: 595 depth = (var->transp.length > 0) ? 32 : 24; 596 break; 597 default: 598 depth = var->bits_per_pixel; 599 break; 600 } 601 602 switch (depth) { 603 case 8: 604 var->red.offset = 0; 605 var->green.offset = 0; 606 var->blue.offset = 0; 607 var->red.length = 8; 608 var->green.length = 8; 609 var->blue.length = 8; 610 var->transp.length = 0; 611 var->transp.offset = 0; 612 break; 613 case 15: 614 var->red.offset = 10; 615 var->green.offset = 5; 616 var->blue.offset = 0; 617 var->red.length = 5; 618 var->green.length = 5; 619 var->blue.length = 5; 620 var->transp.length = 1; 621 var->transp.offset = 15; 622 break; 623 case 16: 624 var->red.offset = 11; 625 var->green.offset = 5; 626 var->blue.offset = 0; 627 var->red.length = 5; 628 var->green.length = 6; 629 var->blue.length = 5; 630 var->transp.length = 0; 631 var->transp.offset = 0; 632 break; 633 case 24: 634 var->red.offset = 16; 635 var->green.offset = 8; 636 var->blue.offset = 0; 637 var->red.length = 8; 638 var->green.length = 8; 639 var->blue.length = 8; 640 var->transp.length = 0; 641 var->transp.offset = 0; 642 break; 643 case 32: 644 var->red.offset = 16; 645 var->green.offset = 8; 646 var->blue.offset = 0; 647 var->red.length = 8; 648 var->green.length = 8; 649 var->blue.length = 8; 650 var->transp.length = 8; 651 var->transp.offset = 24; 652 break; 653 default: 654 return -EINVAL; 655 } 656 return 0; 657 } 658 EXPORT_SYMBOL(drm_fb_helper_check_var); 659 660 /* this will let fbcon do the mode init */ 661 int drm_fb_helper_set_par(struct fb_info *info) 662 { 663 struct drm_fb_helper *fb_helper = info->par; 664 struct drm_device *dev = fb_helper->dev; 665 struct fb_var_screeninfo *var = &info->var; 666 struct drm_crtc *crtc; 667 int ret; 668 int i; 669 670 if (var->pixclock != 0) { 671 DRM_ERROR("PIXEL CLOCK SET\n"); 672 return -EINVAL; 673 } 674 675 mutex_lock(&dev->mode_config.mutex); 676 for (i = 0; i < fb_helper->crtc_count; i++) { 677 crtc = fb_helper->crtc_info[i].mode_set.crtc; 678 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set); 679 if (ret) { 680 mutex_unlock(&dev->mode_config.mutex); 681 return ret; 682 } 683 } 684 mutex_unlock(&dev->mode_config.mutex); 685 686 if (fb_helper->delayed_hotplug) { 687 fb_helper->delayed_hotplug = false; 688 drm_fb_helper_hotplug_event(fb_helper); 689 } 690 return 0; 691 } 692 EXPORT_SYMBOL(drm_fb_helper_set_par); 693 694 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 695 struct fb_info *info) 696 { 697 struct drm_fb_helper *fb_helper = info->par; 698 struct drm_device *dev = fb_helper->dev; 699 struct drm_mode_set *modeset; 700 struct drm_crtc *crtc; 701 int ret = 0; 702 int i; 703 704 mutex_lock(&dev->mode_config.mutex); 705 for (i = 0; i < fb_helper->crtc_count; i++) { 706 crtc = fb_helper->crtc_info[i].mode_set.crtc; 707 708 modeset = &fb_helper->crtc_info[i].mode_set; 709 710 modeset->x = var->xoffset; 711 modeset->y = var->yoffset; 712 713 if (modeset->num_connectors) { 714 ret = crtc->funcs->set_config(modeset); 715 if (!ret) { 716 info->var.xoffset = var->xoffset; 717 info->var.yoffset = var->yoffset; 718 } 719 } 720 } 721 mutex_unlock(&dev->mode_config.mutex); 722 return ret; 723 } 724 EXPORT_SYMBOL(drm_fb_helper_pan_display); 725 726 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, 727 int preferred_bpp) 728 { 729 int new_fb = 0; 730 int crtc_count = 0; 731 int i; 732 struct fb_info *info; 733 struct drm_fb_helper_surface_size sizes; 734 int gamma_size = 0; 735 736 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); 737 sizes.surface_depth = 24; 738 sizes.surface_bpp = 32; 739 sizes.fb_width = (unsigned)-1; 740 sizes.fb_height = (unsigned)-1; 741 742 /* if driver picks 8 or 16 by default use that 743 for both depth/bpp */ 744 if (preferred_bpp != sizes.surface_bpp) 745 sizes.surface_depth = sizes.surface_bpp = preferred_bpp; 746 747 /* first up get a count of crtcs now in use and new min/maxes width/heights */ 748 for (i = 0; i < fb_helper->connector_count; i++) { 749 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; 750 struct drm_cmdline_mode *cmdline_mode; 751 752 cmdline_mode = &fb_helper_conn->cmdline_mode; 753 754 if (cmdline_mode->bpp_specified) { 755 switch (cmdline_mode->bpp) { 756 case 8: 757 sizes.surface_depth = sizes.surface_bpp = 8; 758 break; 759 case 15: 760 sizes.surface_depth = 15; 761 sizes.surface_bpp = 16; 762 break; 763 case 16: 764 sizes.surface_depth = sizes.surface_bpp = 16; 765 break; 766 case 24: 767 sizes.surface_depth = sizes.surface_bpp = 24; 768 break; 769 case 32: 770 sizes.surface_depth = 24; 771 sizes.surface_bpp = 32; 772 break; 773 } 774 break; 775 } 776 } 777 778 crtc_count = 0; 779 for (i = 0; i < fb_helper->crtc_count; i++) { 780 struct drm_display_mode *desired_mode; 781 desired_mode = fb_helper->crtc_info[i].desired_mode; 782 783 if (desired_mode) { 784 if (gamma_size == 0) 785 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; 786 if (desired_mode->hdisplay < sizes.fb_width) 787 sizes.fb_width = desired_mode->hdisplay; 788 if (desired_mode->vdisplay < sizes.fb_height) 789 sizes.fb_height = desired_mode->vdisplay; 790 if (desired_mode->hdisplay > sizes.surface_width) 791 sizes.surface_width = desired_mode->hdisplay; 792 if (desired_mode->vdisplay > sizes.surface_height) 793 sizes.surface_height = desired_mode->vdisplay; 794 crtc_count++; 795 } 796 } 797 798 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { 799 /* hmm everyone went away - assume VGA cable just fell out 800 and will come back later. */ 801 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n"); 802 sizes.fb_width = sizes.surface_width = 1024; 803 sizes.fb_height = sizes.surface_height = 768; 804 } 805 806 /* push down into drivers */ 807 new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); 808 if (new_fb < 0) 809 return new_fb; 810 811 info = fb_helper->fbdev; 812 813 /* set the fb pointer */ 814 for (i = 0; i < fb_helper->crtc_count; i++) 815 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; 816 817 if (new_fb) { 818 info->var.pixclock = 0; 819 if (register_framebuffer(info) < 0) 820 return -EINVAL; 821 822 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n", 823 info->node, info->fix.id); 824 825 } else { 826 drm_fb_helper_set_par(info); 827 } 828 829 /* Switch back to kernel console on panic */ 830 /* multi card linked list maybe */ 831 if (list_empty(&kernel_fb_helper_list)) { 832 dev_info(fb_helper->dev->dev, "registered panic notifier\n"); 833 atomic_notifier_chain_register(&panic_notifier_list, 834 &paniced); 835 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 836 } 837 if (new_fb) 838 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 839 840 return 0; 841 } 842 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe); 843 844 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 845 uint32_t depth) 846 { 847 info->fix.type = FB_TYPE_PACKED_PIXELS; 848 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : 849 FB_VISUAL_TRUECOLOR; 850 info->fix.mmio_start = 0; 851 info->fix.mmio_len = 0; 852 info->fix.type_aux = 0; 853 info->fix.xpanstep = 1; /* doing it in hw */ 854 info->fix.ypanstep = 1; /* doing it in hw */ 855 info->fix.ywrapstep = 0; 856 info->fix.accel = FB_ACCEL_NONE; 857 info->fix.type_aux = 0; 858 859 info->fix.line_length = pitch; 860 return; 861 } 862 EXPORT_SYMBOL(drm_fb_helper_fill_fix); 863 864 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 865 uint32_t fb_width, uint32_t fb_height) 866 { 867 struct drm_framebuffer *fb = fb_helper->fb; 868 info->pseudo_palette = fb_helper->pseudo_palette; 869 info->var.xres_virtual = fb->width; 870 info->var.yres_virtual = fb->height; 871 info->var.bits_per_pixel = fb->bits_per_pixel; 872 info->var.accel_flags = FB_ACCELF_TEXT; 873 info->var.xoffset = 0; 874 info->var.yoffset = 0; 875 info->var.activate = FB_ACTIVATE_NOW; 876 info->var.height = -1; 877 info->var.width = -1; 878 879 switch (fb->depth) { 880 case 8: 881 info->var.red.offset = 0; 882 info->var.green.offset = 0; 883 info->var.blue.offset = 0; 884 info->var.red.length = 8; /* 8bit DAC */ 885 info->var.green.length = 8; 886 info->var.blue.length = 8; 887 info->var.transp.offset = 0; 888 info->var.transp.length = 0; 889 break; 890 case 15: 891 info->var.red.offset = 10; 892 info->var.green.offset = 5; 893 info->var.blue.offset = 0; 894 info->var.red.length = 5; 895 info->var.green.length = 5; 896 info->var.blue.length = 5; 897 info->var.transp.offset = 15; 898 info->var.transp.length = 1; 899 break; 900 case 16: 901 info->var.red.offset = 11; 902 info->var.green.offset = 5; 903 info->var.blue.offset = 0; 904 info->var.red.length = 5; 905 info->var.green.length = 6; 906 info->var.blue.length = 5; 907 info->var.transp.offset = 0; 908 break; 909 case 24: 910 info->var.red.offset = 16; 911 info->var.green.offset = 8; 912 info->var.blue.offset = 0; 913 info->var.red.length = 8; 914 info->var.green.length = 8; 915 info->var.blue.length = 8; 916 info->var.transp.offset = 0; 917 info->var.transp.length = 0; 918 break; 919 case 32: 920 info->var.red.offset = 16; 921 info->var.green.offset = 8; 922 info->var.blue.offset = 0; 923 info->var.red.length = 8; 924 info->var.green.length = 8; 925 info->var.blue.length = 8; 926 info->var.transp.offset = 24; 927 info->var.transp.length = 8; 928 break; 929 default: 930 break; 931 } 932 933 info->var.xres = fb_width; 934 info->var.yres = fb_height; 935 } 936 EXPORT_SYMBOL(drm_fb_helper_fill_var); 937 938 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, 939 uint32_t maxX, 940 uint32_t maxY) 941 { 942 struct drm_connector *connector; 943 int count = 0; 944 int i; 945 946 for (i = 0; i < fb_helper->connector_count; i++) { 947 connector = fb_helper->connector_info[i]->connector; 948 count += connector->funcs->fill_modes(connector, maxX, maxY); 949 } 950 951 return count; 952 } 953 954 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) 955 { 956 struct drm_display_mode *mode; 957 958 list_for_each_entry(mode, &fb_connector->connector->modes, head) { 959 if (drm_mode_width(mode) > width || 960 drm_mode_height(mode) > height) 961 continue; 962 if (mode->type & DRM_MODE_TYPE_PREFERRED) 963 return mode; 964 } 965 return NULL; 966 } 967 968 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) 969 { 970 struct drm_cmdline_mode *cmdline_mode; 971 cmdline_mode = &fb_connector->cmdline_mode; 972 return cmdline_mode->specified; 973 } 974 975 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 976 int width, int height) 977 { 978 struct drm_cmdline_mode *cmdline_mode; 979 struct drm_display_mode *mode = NULL; 980 981 cmdline_mode = &fb_helper_conn->cmdline_mode; 982 if (cmdline_mode->specified == false) 983 return mode; 984 985 /* attempt to find a matching mode in the list of modes 986 * we have gotten so far, if not add a CVT mode that conforms 987 */ 988 if (cmdline_mode->rb || cmdline_mode->margins) 989 goto create_mode; 990 991 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 992 /* check width/height */ 993 if (mode->hdisplay != cmdline_mode->xres || 994 mode->vdisplay != cmdline_mode->yres) 995 continue; 996 997 if (cmdline_mode->refresh_specified) { 998 if (mode->vrefresh != cmdline_mode->refresh) 999 continue; 1000 } 1001 1002 if (cmdline_mode->interlace) { 1003 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) 1004 continue; 1005 } 1006 return mode; 1007 } 1008 1009 create_mode: 1010 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, 1011 cmdline_mode); 1012 list_add(&mode->head, &fb_helper_conn->connector->modes); 1013 return mode; 1014 } 1015 1016 static bool drm_connector_enabled(struct drm_connector *connector, bool strict) 1017 { 1018 bool enable; 1019 1020 if (strict) 1021 enable = connector->status == connector_status_connected; 1022 else 1023 enable = connector->status != connector_status_disconnected; 1024 1025 return enable; 1026 } 1027 1028 static void drm_enable_connectors(struct drm_fb_helper *fb_helper, 1029 bool *enabled) 1030 { 1031 bool any_enabled = false; 1032 struct drm_connector *connector; 1033 int i = 0; 1034 1035 for (i = 0; i < fb_helper->connector_count; i++) { 1036 connector = fb_helper->connector_info[i]->connector; 1037 enabled[i] = drm_connector_enabled(connector, true); 1038 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, 1039 enabled[i] ? "yes" : "no"); 1040 any_enabled |= enabled[i]; 1041 } 1042 1043 if (any_enabled) 1044 return; 1045 1046 for (i = 0; i < fb_helper->connector_count; i++) { 1047 connector = fb_helper->connector_info[i]->connector; 1048 enabled[i] = drm_connector_enabled(connector, false); 1049 } 1050 } 1051 1052 static bool drm_target_cloned(struct drm_fb_helper *fb_helper, 1053 struct drm_display_mode **modes, 1054 bool *enabled, int width, int height) 1055 { 1056 int count, i, j; 1057 bool can_clone = false; 1058 struct drm_fb_helper_connector *fb_helper_conn; 1059 struct drm_display_mode *dmt_mode, *mode; 1060 1061 /* only contemplate cloning in the single crtc case */ 1062 if (fb_helper->crtc_count > 1) 1063 return false; 1064 1065 count = 0; 1066 for (i = 0; i < fb_helper->connector_count; i++) { 1067 if (enabled[i]) 1068 count++; 1069 } 1070 1071 /* only contemplate cloning if more than one connector is enabled */ 1072 if (count <= 1) 1073 return false; 1074 1075 /* check the command line or if nothing common pick 1024x768 */ 1076 can_clone = true; 1077 for (i = 0; i < fb_helper->connector_count; i++) { 1078 if (!enabled[i]) 1079 continue; 1080 fb_helper_conn = fb_helper->connector_info[i]; 1081 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1082 if (!modes[i]) { 1083 can_clone = false; 1084 break; 1085 } 1086 for (j = 0; j < i; j++) { 1087 if (!enabled[j]) 1088 continue; 1089 if (!drm_mode_equal(modes[j], modes[i])) 1090 can_clone = false; 1091 } 1092 } 1093 1094 if (can_clone) { 1095 DRM_DEBUG_KMS("can clone using command line\n"); 1096 return true; 1097 } 1098 1099 /* try and find a 1024x768 mode on each connector */ 1100 can_clone = true; 1101 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false); 1102 1103 for (i = 0; i < fb_helper->connector_count; i++) { 1104 1105 if (!enabled[i]) 1106 continue; 1107 1108 fb_helper_conn = fb_helper->connector_info[i]; 1109 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { 1110 if (drm_mode_equal(mode, dmt_mode)) 1111 modes[i] = mode; 1112 } 1113 if (!modes[i]) 1114 can_clone = false; 1115 } 1116 1117 if (can_clone) { 1118 DRM_DEBUG_KMS("can clone using 1024x768\n"); 1119 return true; 1120 } 1121 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); 1122 return false; 1123 } 1124 1125 static bool drm_target_preferred(struct drm_fb_helper *fb_helper, 1126 struct drm_display_mode **modes, 1127 bool *enabled, int width, int height) 1128 { 1129 struct drm_fb_helper_connector *fb_helper_conn; 1130 int i; 1131 1132 for (i = 0; i < fb_helper->connector_count; i++) { 1133 fb_helper_conn = fb_helper->connector_info[i]; 1134 1135 if (enabled[i] == false) 1136 continue; 1137 1138 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", 1139 fb_helper_conn->connector->base.id); 1140 1141 /* got for command line mode first */ 1142 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); 1143 if (!modes[i]) { 1144 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n", 1145 fb_helper_conn->connector->base.id); 1146 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); 1147 } 1148 /* No preferred modes, pick one off the list */ 1149 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { 1150 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) 1151 break; 1152 } 1153 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : 1154 "none"); 1155 } 1156 return true; 1157 } 1158 1159 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, 1160 struct drm_fb_helper_crtc **best_crtcs, 1161 struct drm_display_mode **modes, 1162 int n, int width, int height) 1163 { 1164 int c, o; 1165 struct drm_device *dev = fb_helper->dev; 1166 struct drm_connector *connector; 1167 struct drm_connector_helper_funcs *connector_funcs; 1168 struct drm_encoder *encoder; 1169 struct drm_fb_helper_crtc *best_crtc; 1170 int my_score, best_score, score; 1171 struct drm_fb_helper_crtc **crtcs, *crtc; 1172 struct drm_fb_helper_connector *fb_helper_conn; 1173 1174 if (n == fb_helper->connector_count) 1175 return 0; 1176 1177 fb_helper_conn = fb_helper->connector_info[n]; 1178 connector = fb_helper_conn->connector; 1179 1180 best_crtcs[n] = NULL; 1181 best_crtc = NULL; 1182 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); 1183 if (modes[n] == NULL) 1184 return best_score; 1185 1186 crtcs = kzalloc(dev->mode_config.num_connector * 1187 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 1188 if (!crtcs) 1189 return best_score; 1190 1191 my_score = 1; 1192 if (connector->status == connector_status_connected) 1193 my_score++; 1194 if (drm_has_cmdline_mode(fb_helper_conn)) 1195 my_score++; 1196 if (drm_has_preferred_mode(fb_helper_conn, width, height)) 1197 my_score++; 1198 1199 connector_funcs = connector->helper_private; 1200 encoder = connector_funcs->best_encoder(connector); 1201 if (!encoder) 1202 goto out; 1203 1204 /* select a crtc for this connector and then attempt to configure 1205 remaining connectors */ 1206 for (c = 0; c < fb_helper->crtc_count; c++) { 1207 crtc = &fb_helper->crtc_info[c]; 1208 1209 if ((encoder->possible_crtcs & (1 << c)) == 0) 1210 continue; 1211 1212 for (o = 0; o < n; o++) 1213 if (best_crtcs[o] == crtc) 1214 break; 1215 1216 if (o < n) { 1217 /* ignore cloning unless only a single crtc */ 1218 if (fb_helper->crtc_count > 1) 1219 continue; 1220 1221 if (!drm_mode_equal(modes[o], modes[n])) 1222 continue; 1223 } 1224 1225 crtcs[n] = crtc; 1226 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); 1227 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, 1228 width, height); 1229 if (score > best_score) { 1230 best_crtc = crtc; 1231 best_score = score; 1232 memcpy(best_crtcs, crtcs, 1233 dev->mode_config.num_connector * 1234 sizeof(struct drm_fb_helper_crtc *)); 1235 } 1236 } 1237 out: 1238 kfree(crtcs); 1239 return best_score; 1240 } 1241 1242 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) 1243 { 1244 struct drm_device *dev = fb_helper->dev; 1245 struct drm_fb_helper_crtc **crtcs; 1246 struct drm_display_mode **modes; 1247 struct drm_mode_set *modeset; 1248 bool *enabled; 1249 int width, height; 1250 int i, ret; 1251 1252 DRM_DEBUG_KMS("\n"); 1253 1254 width = dev->mode_config.max_width; 1255 height = dev->mode_config.max_height; 1256 1257 crtcs = kcalloc(dev->mode_config.num_connector, 1258 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); 1259 modes = kcalloc(dev->mode_config.num_connector, 1260 sizeof(struct drm_display_mode *), GFP_KERNEL); 1261 enabled = kcalloc(dev->mode_config.num_connector, 1262 sizeof(bool), GFP_KERNEL); 1263 if (!crtcs || !modes || !enabled) { 1264 DRM_ERROR("Memory allocation failed\n"); 1265 goto out; 1266 } 1267 1268 1269 drm_enable_connectors(fb_helper, enabled); 1270 1271 ret = drm_target_cloned(fb_helper, modes, enabled, width, height); 1272 if (!ret) { 1273 ret = drm_target_preferred(fb_helper, modes, enabled, width, height); 1274 if (!ret) 1275 DRM_ERROR("Unable to find initial modes\n"); 1276 } 1277 1278 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height); 1279 1280 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); 1281 1282 /* need to set the modesets up here for use later */ 1283 /* fill out the connector<->crtc mappings into the modesets */ 1284 for (i = 0; i < fb_helper->crtc_count; i++) { 1285 modeset = &fb_helper->crtc_info[i].mode_set; 1286 modeset->num_connectors = 0; 1287 } 1288 1289 for (i = 0; i < fb_helper->connector_count; i++) { 1290 struct drm_display_mode *mode = modes[i]; 1291 struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; 1292 modeset = &fb_crtc->mode_set; 1293 1294 if (mode && fb_crtc) { 1295 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n", 1296 mode->name, fb_crtc->mode_set.crtc->base.id); 1297 fb_crtc->desired_mode = mode; 1298 if (modeset->mode) 1299 drm_mode_destroy(dev, modeset->mode); 1300 modeset->mode = drm_mode_duplicate(dev, 1301 fb_crtc->desired_mode); 1302 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector; 1303 } 1304 } 1305 1306 out: 1307 kfree(crtcs); 1308 kfree(modes); 1309 kfree(enabled); 1310 } 1311 1312 /** 1313 * drm_helper_initial_config - setup a sane initial connector configuration 1314 * @fb_helper: fb_helper device struct 1315 * @bpp_sel: bpp value to use for the framebuffer configuration 1316 * 1317 * LOCKING: 1318 * Called at init time by the driver to set up the @fb_helper initial 1319 * configuration, must take the mode config lock. 1320 * 1321 * Scans the CRTCs and connectors and tries to put together an initial setup. 1322 * At the moment, this is a cloned configuration across all heads with 1323 * a new framebuffer object as the backing store. 1324 * 1325 * RETURNS: 1326 * Zero if everything went ok, nonzero otherwise. 1327 */ 1328 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) 1329 { 1330 struct drm_device *dev = fb_helper->dev; 1331 int count = 0; 1332 1333 /* disable all the possible outputs/crtcs before entering KMS mode */ 1334 drm_helper_disable_unused_functions(fb_helper->dev); 1335 1336 drm_fb_helper_parse_command_line(fb_helper); 1337 1338 count = drm_fb_helper_probe_connector_modes(fb_helper, 1339 dev->mode_config.max_width, 1340 dev->mode_config.max_height); 1341 /* 1342 * we shouldn't end up with no modes here. 1343 */ 1344 if (count == 0) 1345 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n"); 1346 1347 drm_setup_crtcs(fb_helper); 1348 1349 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 1350 } 1351 EXPORT_SYMBOL(drm_fb_helper_initial_config); 1352 1353 /** 1354 * drm_fb_helper_hotplug_event - respond to a hotplug notification by 1355 * probing all the outputs attached to the fb 1356 * @fb_helper: the drm_fb_helper 1357 * 1358 * LOCKING: 1359 * Called at runtime, must take mode config lock. 1360 * 1361 * Scan the connectors attached to the fb_helper and try to put together a 1362 * setup after *notification of a change in output configuration. 1363 * 1364 * RETURNS: 1365 * 0 on success and a non-zero error code otherwise. 1366 */ 1367 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 1368 { 1369 struct drm_device *dev = fb_helper->dev; 1370 int count = 0; 1371 u32 max_width, max_height, bpp_sel; 1372 int bound = 0, crtcs_bound = 0; 1373 struct drm_crtc *crtc; 1374 1375 if (!fb_helper->fb) 1376 return 0; 1377 1378 mutex_lock(&dev->mode_config.mutex); 1379 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 1380 if (crtc->fb) 1381 crtcs_bound++; 1382 if (crtc->fb == fb_helper->fb) 1383 bound++; 1384 } 1385 1386 if (bound < crtcs_bound) { 1387 fb_helper->delayed_hotplug = true; 1388 mutex_unlock(&dev->mode_config.mutex); 1389 return 0; 1390 } 1391 DRM_DEBUG_KMS("\n"); 1392 1393 max_width = fb_helper->fb->width; 1394 max_height = fb_helper->fb->height; 1395 bpp_sel = fb_helper->fb->bits_per_pixel; 1396 1397 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width, 1398 max_height); 1399 drm_setup_crtcs(fb_helper); 1400 mutex_unlock(&dev->mode_config.mutex); 1401 1402 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); 1403 } 1404 EXPORT_SYMBOL(drm_fb_helper_hotplug_event); 1405 1406 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) 1407 * but the module doesn't depend on any fb console symbols. At least 1408 * attempt to load fbcon to avoid leaving the system without a usable console. 1409 */ 1410 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) 1411 static int __init drm_fb_helper_modinit(void) 1412 { 1413 const char *name = "fbcon"; 1414 struct module *fbcon; 1415 1416 mutex_lock(&module_mutex); 1417 fbcon = find_module(name); 1418 mutex_unlock(&module_mutex); 1419 1420 if (!fbcon) 1421 request_module_nowait(name); 1422 return 0; 1423 } 1424 1425 module_init(drm_fb_helper_modinit); 1426 #endif 1427