drivers/gpu/drm/i915/display/intel_fbdev.c

   1 /*
   2  * Copyright © 2007 David Airlie
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *     David Airlie
  25  */
  26
  27 #include <linux/async.h>
  28 #include <linux/console.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/init.h>
  32 #include <linux/kernel.h>
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/string.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/tty.h>
  38 #include <linux/vga_switcheroo.h>
  39
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include <drm/drm_fourcc.h>
  43 #include <drm/i915_drm.h>
  44
  45 #include "i915_drv.h"
  46 #include "intel_drv.h"
  47 #include "intel_fbdev.h"
  48 #include "intel_frontbuffer.h"
  49
  50 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  51 {
  52         struct drm_i915_gem_object *obj = intel_fb_obj(&ifbdev->fb->base);
  53         unsigned int origin =
  54                 ifbdev->vma_flags & PLANE_HAS_FENCE ? ORIGIN_GTT : ORIGIN_CPU;
  55
  56         intel_fb_obj_invalidate(obj, origin);
  57 }
  58
  59 static int intel_fbdev_set_par(struct fb_info *info)
  60 {
  61         struct drm_fb_helper *fb_helper = info->par;
  62         struct intel_fbdev *ifbdev =
  63                 container_of(fb_helper, struct intel_fbdev, helper);
  64         int ret;
  65
  66         ret = drm_fb_helper_set_par(info);
  67         if (ret == 0)
  68                 intel_fbdev_invalidate(ifbdev);
  69
  70         return ret;
  71 }
  72
  73 static int intel_fbdev_blank(int blank, struct fb_info *info)
  74 {
  75         struct drm_fb_helper *fb_helper = info->par;
  76         struct intel_fbdev *ifbdev =
  77                 container_of(fb_helper, struct intel_fbdev, helper);
  78         int ret;
  79
  80         ret = drm_fb_helper_blank(blank, info);
  81         if (ret == 0)
  82                 intel_fbdev_invalidate(ifbdev);
  83
  84         return ret;
  85 }
  86
  87 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  88                                    struct fb_info *info)
  89 {
  90         struct drm_fb_helper *fb_helper = info->par;
  91         struct intel_fbdev *ifbdev =
  92                 container_of(fb_helper, struct intel_fbdev, helper);
  93         int ret;
  94
  95         ret = drm_fb_helper_pan_display(var, info);
  96         if (ret == 0)
  97                 intel_fbdev_invalidate(ifbdev);
  98
  99         return ret;
 100 }
 101
 102 static struct fb_ops intelfb_ops = {
 103         .owner = THIS_MODULE,
 104         DRM_FB_HELPER_DEFAULT_OPS,
 105         .fb_set_par = intel_fbdev_set_par,
 106         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 107         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 108         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 109         .fb_pan_display = intel_fbdev_pan_display,
 110         .fb_blank = intel_fbdev_blank,
 111 };
 112
 113 static int intelfb_alloc(struct drm_fb_helper *helper,
 114                          struct drm_fb_helper_surface_size *sizes)
 115 {
 116         struct intel_fbdev *ifbdev =
 117                 container_of(helper, struct intel_fbdev, helper);
 118         struct drm_framebuffer *fb;
 119         struct drm_device *dev = helper->dev;
 120         struct drm_i915_private *dev_priv = to_i915(dev);
 121         struct drm_mode_fb_cmd2 mode_cmd = {};
 122         struct drm_i915_gem_object *obj;
 123         int size, ret;
 124
 125         /* we don't do packed 24bpp */
 126         if (sizes->surface_bpp == 24)
 127                 sizes->surface_bpp = 32;
 128
 129         mode_cmd.width = sizes->surface_width;
 130         mode_cmd.height = sizes->surface_height;
 131
 132         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 133                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 134         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 135                                                           sizes->surface_depth);
 136
 137         size = mode_cmd.pitches[0] * mode_cmd.height;
 138         size = PAGE_ALIGN(size);
 139
 140         /* If the FB is too big, just don't use it since fbdev is not very
 141          * important and we should probably use that space with FBC or other
 142          * features. */
 143         obj = NULL;
 144         if (size * 2 < dev_priv->stolen_usable_size)
 145                 obj = i915_gem_object_create_stolen(dev_priv, size);
 146         if (obj == NULL)
 147                 obj = i915_gem_object_create_shmem(dev_priv, size);
 148         if (IS_ERR(obj)) {
 149                 DRM_ERROR("failed to allocate framebuffer\n");
 150                 ret = PTR_ERR(obj);
 151                 goto err;
 152         }
 153
 154         fb = intel_framebuffer_create(obj, &mode_cmd);
 155         if (IS_ERR(fb)) {
 156                 ret = PTR_ERR(fb);
 157                 goto err_obj;
 158         }
 159
 160         ifbdev->fb = to_intel_framebuffer(fb);
 161
 162         return 0;
 163
 164 err_obj:
 165         i915_gem_object_put(obj);
 166 err:
 167         return ret;
 168 }
 169
 170 static int intelfb_create(struct drm_fb_helper *helper,
 171                           struct drm_fb_helper_surface_size *sizes)
 172 {
 173         struct intel_fbdev *ifbdev =
 174                 container_of(helper, struct intel_fbdev, helper);
 175         struct intel_framebuffer *intel_fb = ifbdev->fb;
 176         struct drm_device *dev = helper->dev;
 177         struct drm_i915_private *dev_priv = to_i915(dev);
 178         struct pci_dev *pdev = dev_priv->drm.pdev;
 179         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 180         const struct i915_ggtt_view view = {
 181                 .type = I915_GGTT_VIEW_NORMAL,
 182         };
 183         struct drm_framebuffer *fb;
 184         intel_wakeref_t wakeref;
 185         struct fb_info *info;
 186         struct i915_vma *vma;
 187         unsigned long flags = 0;
 188         bool prealloc = false;
 189         void __iomem *vaddr;
 190         int ret;
 191
 192         if (intel_fb &&
 193             (sizes->fb_width > intel_fb->base.width ||
 194              sizes->fb_height > intel_fb->base.height)) {
 195                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 196                               " releasing it\n",
 197                               intel_fb->base.width, intel_fb->base.height,
 198                               sizes->fb_width, sizes->fb_height);
 199                 drm_framebuffer_put(&intel_fb->base);
 200                 intel_fb = ifbdev->fb = NULL;
 201         }
 202         if (!intel_fb || WARN_ON(!intel_fb_obj(&intel_fb->base))) {
 203                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 204                 ret = intelfb_alloc(helper, sizes);
 205                 if (ret)
 206                         return ret;
 207                 intel_fb = ifbdev->fb;
 208         } else {
 209                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 210                 prealloc = true;
 211                 sizes->fb_width = intel_fb->base.width;
 212                 sizes->fb_height = intel_fb->base.height;
 213         }
 214
 215         mutex_lock(&dev->struct_mutex);
 216         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 217
 218         /* Pin the GGTT vma for our access via info->screen_base.
 219          * This also validates that any existing fb inherited from the
 220          * BIOS is suitable for own access.
 221          */
 222         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base,
 223                                          &view, false, &flags);
 224         if (IS_ERR(vma)) {
 225                 ret = PTR_ERR(vma);
 226                 goto out_unlock;
 227         }
 228
 229         fb = &ifbdev->fb->base;
 230         intel_fb_obj_flush(intel_fb_obj(fb), ORIGIN_DIRTYFB);
 231
 232         info = drm_fb_helper_alloc_fbi(helper);
 233         if (IS_ERR(info)) {
 234                 DRM_ERROR("Failed to allocate fb_info\n");
 235                 ret = PTR_ERR(info);
 236                 goto out_unpin;
 237         }
 238
 239         ifbdev->helper.fb = fb;
 240
 241         info->fbops = &intelfb_ops;
 242
 243         /* setup aperture base/size for vesafb takeover */
 244         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 245         info->apertures->ranges[0].size = ggtt->mappable_end;
 246
 247         info->fix.smem_start = dev->mode_config.fb_base + i915_ggtt_offset(vma);
 248         info->fix.smem_len = vma->node.size;
 249
 250         vaddr = i915_vma_pin_iomap(vma);
 251         if (IS_ERR(vaddr)) {
 252                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 253                 ret = PTR_ERR(vaddr);
 254                 goto out_unpin;
 255         }
 256         info->screen_base = vaddr;
 257         info->screen_size = vma->node.size;
 258
 259         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 260
 261         /* If the object is shmemfs backed, it will have given us zeroed pages.
 262          * If the object is stolen however, it will be full of whatever
 263          * garbage was left in there.
 264          */
 265         if (intel_fb_obj(fb)->stolen && !prealloc)
 266                 memset_io(info->screen_base, 0, info->screen_size);
 267
 268         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 269
 270         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x\n",
 271                       fb->width, fb->height, i915_ggtt_offset(vma));
 272         ifbdev->vma = vma;
 273         ifbdev->vma_flags = flags;
 274
 275         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 276         mutex_unlock(&dev->struct_mutex);
 277         vga_switcheroo_client_fb_set(pdev, info);
 278         return 0;
 279
 280 out_unpin:
 281         intel_unpin_fb_vma(vma, flags);
 282 out_unlock:
 283         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 284         mutex_unlock(&dev->struct_mutex);
 285         return ret;
 286 }
 287
 288 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 289         .fb_probe = intelfb_create,
 290 };
 291
 292 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 293 {
 294         /* We rely on the object-free to release the VMA pinning for
 295          * the info->screen_base mmaping. Leaking the VMA is simpler than
 296          * trying to rectify all the possible error paths leading here.
 297          */
 298
 299         drm_fb_helper_fini(&ifbdev->helper);
 300
 301         if (ifbdev->vma) {
 302                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 303                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 304                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 305         }
 306
 307         if (ifbdev->fb)
 308                 drm_framebuffer_remove(&ifbdev->fb->base);
 309
 310         kfree(ifbdev);
 311 }
 312
 313 /*
 314  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 315  * The core display code will have read out the current plane configuration,
 316  * so we use that to figure out if there's an object for us to use as the
 317  * fb, and if so, we re-use it for the fbdev configuration.
 318  *
 319  * Note we only support a single fb shared across pipes for boot (mostly for
 320  * fbcon), so we just find the biggest and use that.
 321  */
 322 static bool intel_fbdev_init_bios(struct drm_device *dev,
 323                                  struct intel_fbdev *ifbdev)
 324 {
 325         struct intel_framebuffer *fb = NULL;
 326         struct drm_crtc *crtc;
 327         struct intel_crtc *intel_crtc;
 328         unsigned int max_size = 0;
 329
 330         /* Find the largest fb */
 331         for_each_crtc(dev, crtc) {
 332                 struct drm_i915_gem_object *obj =
 333                         intel_fb_obj(crtc->primary->state->fb);
 334                 intel_crtc = to_intel_crtc(crtc);
 335
 336                 if (!crtc->state->active || !obj) {
 337                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 338                                       pipe_name(intel_crtc->pipe));
 339                         continue;
 340                 }
 341
 342                 if (obj->base.size > max_size) {
 343                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 344                                       pipe_name(intel_crtc->pipe));
 345                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 346                         max_size = obj->base.size;
 347                 }
 348         }
 349
 350         if (!fb) {
 351                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 352                 goto out;
 353         }
 354
 355         /* Now make sure all the pipes will fit into it */
 356         for_each_crtc(dev, crtc) {
 357                 unsigned int cur_size;
 358
 359                 intel_crtc = to_intel_crtc(crtc);
 360
 361                 if (!crtc->state->active) {
 362                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 363                                       pipe_name(intel_crtc->pipe));
 364                         continue;
 365                 }
 366
 367                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 368                               pipe_name(intel_crtc->pipe));
 369
 370                 /*
 371                  * See if the plane fb we found above will fit on this
 372                  * pipe.  Note we need to use the selected fb's pitch and bpp
 373                  * rather than the current pipe's, since they differ.
 374                  */
 375                 cur_size = crtc->state->adjusted_mode.crtc_hdisplay;
 376                 cur_size = cur_size * fb->base.format->cpp[0];
 377                 if (fb->base.pitches[0] < cur_size) {
 378                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 379                                       pipe_name(intel_crtc->pipe),
 380                                       cur_size, fb->base.pitches[0]);
 381                         fb = NULL;
 382                         break;
 383                 }
 384
 385                 cur_size = crtc->state->adjusted_mode.crtc_vdisplay;
 386                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 387                 cur_size *= fb->base.pitches[0];
 388                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 389                               pipe_name(intel_crtc->pipe),
 390                               crtc->state->adjusted_mode.crtc_hdisplay,
 391                               crtc->state->adjusted_mode.crtc_vdisplay,
 392                               fb->base.format->cpp[0] * 8,
 393                               cur_size);
 394
 395                 if (cur_size > max_size) {
 396                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 397                                       pipe_name(intel_crtc->pipe),
 398                                       cur_size, max_size);
 399                         fb = NULL;
 400                         break;
 401                 }
 402
 403                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 404                               pipe_name(intel_crtc->pipe),
 405                               max_size, cur_size);
 406         }
 407
 408         if (!fb) {
 409                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 410                 goto out;
 411         }
 412
 413         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 414         ifbdev->fb = fb;
 415
 416         drm_framebuffer_get(&ifbdev->fb->base);
 417
 418         /* Final pass to check if any active pipes don't have fbs */
 419         for_each_crtc(dev, crtc) {
 420                 intel_crtc = to_intel_crtc(crtc);
 421
 422                 if (!crtc->state->active)
 423                         continue;
 424
 425                 WARN(!crtc->primary->state->fb,
 426                      "re-used BIOS config but lost an fb on crtc %d\n",
 427                      crtc->base.id);
 428         }
 429
 430
 431         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 432         return true;
 433
 434 out:
 435
 436         return false;
 437 }
 438
 439 static void intel_fbdev_suspend_worker(struct work_struct *work)
 440 {
 441         intel_fbdev_set_suspend(&container_of(work,
 442                                               struct drm_i915_private,
 443                                               fbdev_suspend_work)->drm,
 444                                 FBINFO_STATE_RUNNING,
 445                                 true);
 446 }
 447
 448 int intel_fbdev_init(struct drm_device *dev)
 449 {
 450         struct drm_i915_private *dev_priv = to_i915(dev);
 451         struct intel_fbdev *ifbdev;
 452         int ret;
 453
 454         if (WARN_ON(!HAS_DISPLAY(dev_priv)))
 455                 return -ENODEV;
 456
 457         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 458         if (ifbdev == NULL)
 459                 return -ENOMEM;
 460
 461         mutex_init(&ifbdev->hpd_lock);
 462         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 463
 464         if (!intel_fbdev_init_bios(dev, ifbdev))
 465                 ifbdev->preferred_bpp = 32;
 466
 467         ret = drm_fb_helper_init(dev, &ifbdev->helper, 4);
 468         if (ret) {
 469                 kfree(ifbdev);
 470                 return ret;
 471         }
 472
 473         dev_priv->fbdev = ifbdev;
 474         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 475
 476         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 477
 478         return 0;
 479 }
 480
 481 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 482 {
 483         struct intel_fbdev *ifbdev = data;
 484
 485         /* Due to peculiar init order wrt to hpd handling this is separate. */
 486         if (drm_fb_helper_initial_config(&ifbdev->helper,
 487                                          ifbdev->preferred_bpp))
 488                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 489 }
 490
 491 void intel_fbdev_initial_config_async(struct drm_device *dev)
 492 {
 493         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 494
 495         if (!ifbdev)
 496                 return;
 497
 498         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 499 }
 500
 501 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 502 {
 503         if (!ifbdev->cookie)
 504                 return;
 505
 506         /* Only serialises with all preceding async calls, hence +1 */
 507         async_synchronize_cookie(ifbdev->cookie + 1);
 508         ifbdev->cookie = 0;
 509 }
 510
 511 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 512 {
 513         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 514
 515         if (!ifbdev)
 516                 return;
 517
 518         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 519         if (!current_is_async())
 520                 intel_fbdev_sync(ifbdev);
 521
 522         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 523 }
 524
 525 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 526 {
 527         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 528
 529         if (!ifbdev)
 530                 return;
 531
 532         intel_fbdev_destroy(ifbdev);
 533 }
 534
 535 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 536  * processing, fbdev will perform a full connector reprobe if a hotplug event
 537  * was received while HPD was suspended.
 538  */
 539 static void intel_fbdev_hpd_set_suspend(struct intel_fbdev *ifbdev, int state)
 540 {
 541         bool send_hpd = false;
 542
 543         mutex_lock(&ifbdev->hpd_lock);
 544         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 545         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 546         ifbdev->hpd_waiting = false;
 547         mutex_unlock(&ifbdev->hpd_lock);
 548
 549         if (send_hpd) {
 550                 DRM_DEBUG_KMS("Handling delayed fbcon HPD event\n");
 551                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 552         }
 553 }
 554
 555 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 556 {
 557         struct drm_i915_private *dev_priv = to_i915(dev);
 558         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 559         struct fb_info *info;
 560
 561         if (!ifbdev || !ifbdev->vma)
 562                 return;
 563
 564         info = ifbdev->helper.fbdev;
 565
 566         if (synchronous) {
 567                 /* Flush any pending work to turn the console on, and then
 568                  * wait to turn it off. It must be synchronous as we are
 569                  * about to suspend or unload the driver.
 570                  *
 571                  * Note that from within the work-handler, we cannot flush
 572                  * ourselves, so only flush outstanding work upon suspend!
 573                  */
 574                 if (state != FBINFO_STATE_RUNNING)
 575                         flush_work(&dev_priv->fbdev_suspend_work);
 576
 577                 console_lock();
 578         } else {
 579                 /*
 580                  * The console lock can be pretty contented on resume due
 581                  * to all the printk activity.  Try to keep it out of the hot
 582                  * path of resume if possible.
 583                  */
 584                 WARN_ON(state != FBINFO_STATE_RUNNING);
 585                 if (!console_trylock()) {
 586                         /* Don't block our own workqueue as this can
 587                          * be run in parallel with other i915.ko tasks.
 588                          */
 589                         schedule_work(&dev_priv->fbdev_suspend_work);
 590                         return;
 591                 }
 592         }
 593
 594         /* On resume from hibernation: If the object is shmemfs backed, it has
 595          * been restored from swap. If the object is stolen however, it will be
 596          * full of whatever garbage was left in there.
 597          */
 598         if (state == FBINFO_STATE_RUNNING &&
 599             intel_fb_obj(&ifbdev->fb->base)->stolen)
 600                 memset_io(info->screen_base, 0, info->screen_size);
 601
 602         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 603         console_unlock();
 604
 605         intel_fbdev_hpd_set_suspend(ifbdev, state);
 606 }
 607
 608 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 609 {
 610         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 611         bool send_hpd;
 612
 613         if (!ifbdev)
 614                 return;
 615
 616         intel_fbdev_sync(ifbdev);
 617
 618         mutex_lock(&ifbdev->hpd_lock);
 619         send_hpd = !ifbdev->hpd_suspended;
 620         ifbdev->hpd_waiting = true;
 621         mutex_unlock(&ifbdev->hpd_lock);
 622
 623         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 624                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 625 }
 626
 627 void intel_fbdev_restore_mode(struct drm_device *dev)
 628 {
 629         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 630
 631         if (!ifbdev)
 632                 return;
 633
 634         intel_fbdev_sync(ifbdev);
 635         if (!ifbdev->vma)
 636                 return;
 637
 638         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 639                 intel_fbdev_invalidate(ifbdev);
 640 }