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