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
  44 #include "i915_drv.h"
  45 #include "intel_display_types.h"
  46 #include "intel_fbdev.h"
  47 #include "intel_frontbuffer.h"
  48
  49 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
  50 {
  51         return ifbdev->fb->frontbuffer;
  52 }
  53
  54 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  55 {
  56         intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
  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 const 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;
 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 = ERR_PTR(-ENODEV);
 144         if (size * 2 < dev_priv->stolen_usable_size)
 145                 obj = i915_gem_object_create_stolen(dev_priv, size);
 146         if (IS_ERR(obj))
 147                 obj = i915_gem_object_create_shmem(dev_priv, size);
 148         if (IS_ERR(obj)) {
 149                 drm_err(&dev_priv->drm, "failed to allocate framebuffer\n");
 150                 return PTR_ERR(obj);
 151         }
 152
 153         fb = intel_framebuffer_create(obj, &mode_cmd);
 154         i915_gem_object_put(obj);
 155         if (IS_ERR(fb))
 156                 return PTR_ERR(fb);
 157
 158         ifbdev->fb = to_intel_framebuffer(fb);
 159         return 0;
 160 }
 161
 162 static int intelfb_create(struct drm_fb_helper *helper,
 163                           struct drm_fb_helper_surface_size *sizes)
 164 {
 165         struct intel_fbdev *ifbdev =
 166                 container_of(helper, struct intel_fbdev, helper);
 167         struct intel_framebuffer *intel_fb = ifbdev->fb;
 168         struct drm_device *dev = helper->dev;
 169         struct drm_i915_private *dev_priv = to_i915(dev);
 170         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 171         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 172         const struct i915_ggtt_view view = {
 173                 .type = I915_GGTT_VIEW_NORMAL,
 174         };
 175         intel_wakeref_t wakeref;
 176         struct fb_info *info;
 177         struct i915_vma *vma;
 178         unsigned long flags = 0;
 179         bool prealloc = false;
 180         void __iomem *vaddr;
 181         int ret;
 182
 183         if (intel_fb &&
 184             (sizes->fb_width > intel_fb->base.width ||
 185              sizes->fb_height > intel_fb->base.height)) {
 186                 drm_dbg_kms(&dev_priv->drm,
 187                             "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 || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
 195                 drm_dbg_kms(&dev_priv->drm,
 196                             "no BIOS fb, allocating a new one\n");
 197                 ret = intelfb_alloc(helper, sizes);
 198                 if (ret)
 199                         return ret;
 200                 intel_fb = ifbdev->fb;
 201         } else {
 202                 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 203                 prealloc = true;
 204                 sizes->fb_width = intel_fb->base.width;
 205                 sizes->fb_height = intel_fb->base.height;
 206         }
 207
 208         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 209
 210         /* Pin the GGTT vma for our access via info->screen_base.
 211          * This also validates that any existing fb inherited from the
 212          * BIOS is suitable for own access.
 213          */
 214         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
 215                                          &view, false, &flags);
 216         if (IS_ERR(vma)) {
 217                 ret = PTR_ERR(vma);
 218                 goto out_unlock;
 219         }
 220
 221         intel_frontbuffer_flush(to_frontbuffer(ifbdev), ORIGIN_DIRTYFB);
 222
 223         info = drm_fb_helper_alloc_fbi(helper);
 224         if (IS_ERR(info)) {
 225                 drm_err(&dev_priv->drm, "Failed to allocate fb_info\n");
 226                 ret = PTR_ERR(info);
 227                 goto out_unpin;
 228         }
 229
 230         ifbdev->helper.fb = &ifbdev->fb->base;
 231
 232         info->fbops = &intelfb_ops;
 233
 234         /* setup aperture base/size for vesafb takeover */
 235         info->apertures->ranges[0].base = ggtt->gmadr.start;
 236         info->apertures->ranges[0].size = ggtt->mappable_end;
 237
 238         /* Our framebuffer is the entirety of fbdev's system memory */
 239         info->fix.smem_start =
 240                 (unsigned long)(ggtt->gmadr.start + vma->node.start);
 241         info->fix.smem_len = vma->node.size;
 242
 243         vaddr = i915_vma_pin_iomap(vma);
 244         if (IS_ERR(vaddr)) {
 245                 drm_err(&dev_priv->drm,
 246                         "Failed to remap framebuffer into virtual memory\n");
 247                 ret = PTR_ERR(vaddr);
 248                 goto out_unpin;
 249         }
 250         info->screen_base = vaddr;
 251         info->screen_size = vma->node.size;
 252
 253         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 254
 255         /* If the object is shmemfs backed, it will have given us zeroed pages.
 256          * If the object is stolen however, it will be full of whatever
 257          * garbage was left in there.
 258          */
 259         if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
 260                 memset_io(info->screen_base, 0, info->screen_size);
 261
 262         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 263
 264         drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
 265                     ifbdev->fb->base.width, ifbdev->fb->base.height,
 266                     i915_ggtt_offset(vma));
 267         ifbdev->vma = vma;
 268         ifbdev->vma_flags = flags;
 269
 270         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 271         vga_switcheroo_client_fb_set(pdev, info);
 272         return 0;
 273
 274 out_unpin:
 275         intel_unpin_fb_vma(vma, flags);
 276 out_unlock:
 277         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 278         return ret;
 279 }
 280
 281 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 282         .fb_probe = intelfb_create,
 283 };
 284
 285 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 286 {
 287         /* We rely on the object-free to release the VMA pinning for
 288          * the info->screen_base mmaping. Leaking the VMA is simpler than
 289          * trying to rectify all the possible error paths leading here.
 290          */
 291
 292         drm_fb_helper_fini(&ifbdev->helper);
 293
 294         if (ifbdev->vma)
 295                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 296
 297         if (ifbdev->fb)
 298                 drm_framebuffer_remove(&ifbdev->fb->base);
 299
 300         kfree(ifbdev);
 301 }
 302
 303 /*
 304  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 305  * The core display code will have read out the current plane configuration,
 306  * so we use that to figure out if there's an object for us to use as the
 307  * fb, and if so, we re-use it for the fbdev configuration.
 308  *
 309  * Note we only support a single fb shared across pipes for boot (mostly for
 310  * fbcon), so we just find the biggest and use that.
 311  */
 312 static bool intel_fbdev_init_bios(struct drm_device *dev,
 313                                  struct intel_fbdev *ifbdev)
 314 {
 315         struct drm_i915_private *i915 = to_i915(dev);
 316         struct intel_framebuffer *fb = NULL;
 317         struct drm_crtc *crtc;
 318         struct intel_crtc *intel_crtc;
 319         unsigned int max_size = 0;
 320
 321         /* Find the largest fb */
 322         for_each_crtc(dev, crtc) {
 323                 struct drm_i915_gem_object *obj =
 324                         intel_fb_obj(crtc->primary->state->fb);
 325                 intel_crtc = to_intel_crtc(crtc);
 326
 327                 if (!crtc->state->active || !obj) {
 328                         drm_dbg_kms(&i915->drm,
 329                                     "pipe %c not active or no fb, skipping\n",
 330                                     pipe_name(intel_crtc->pipe));
 331                         continue;
 332                 }
 333
 334                 if (obj->base.size > max_size) {
 335                         drm_dbg_kms(&i915->drm,
 336                                     "found possible fb from plane %c\n",
 337                                     pipe_name(intel_crtc->pipe));
 338                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 339                         max_size = obj->base.size;
 340                 }
 341         }
 342
 343         if (!fb) {
 344                 drm_dbg_kms(&i915->drm,
 345                             "no active fbs found, not using BIOS config\n");
 346                 goto out;
 347         }
 348
 349         /* Now make sure all the pipes will fit into it */
 350         for_each_crtc(dev, crtc) {
 351                 unsigned int cur_size;
 352
 353                 intel_crtc = to_intel_crtc(crtc);
 354
 355                 if (!crtc->state->active) {
 356                         drm_dbg_kms(&i915->drm,
 357                                     "pipe %c not active, skipping\n",
 358                                     pipe_name(intel_crtc->pipe));
 359                         continue;
 360                 }
 361
 362                 drm_dbg_kms(&i915->drm, "checking plane %c for BIOS fb\n",
 363                             pipe_name(intel_crtc->pipe));
 364
 365                 /*
 366                  * See if the plane fb we found above will fit on this
 367                  * pipe.  Note we need to use the selected fb's pitch and bpp
 368                  * rather than the current pipe's, since they differ.
 369                  */
 370                 cur_size = crtc->state->adjusted_mode.crtc_hdisplay;
 371                 cur_size = cur_size * fb->base.format->cpp[0];
 372                 if (fb->base.pitches[0] < cur_size) {
 373                         drm_dbg_kms(&i915->drm,
 374                                     "fb not wide enough for plane %c (%d vs %d)\n",
 375                                     pipe_name(intel_crtc->pipe),
 376                                     cur_size, fb->base.pitches[0]);
 377                         fb = NULL;
 378                         break;
 379                 }
 380
 381                 cur_size = crtc->state->adjusted_mode.crtc_vdisplay;
 382                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 383                 cur_size *= fb->base.pitches[0];
 384                 drm_dbg_kms(&i915->drm,
 385                             "pipe %c area: %dx%d, bpp: %d, size: %d\n",
 386                             pipe_name(intel_crtc->pipe),
 387                             crtc->state->adjusted_mode.crtc_hdisplay,
 388                             crtc->state->adjusted_mode.crtc_vdisplay,
 389                             fb->base.format->cpp[0] * 8,
 390                             cur_size);
 391
 392                 if (cur_size > max_size) {
 393                         drm_dbg_kms(&i915->drm,
 394                                     "fb not big enough for plane %c (%d vs %d)\n",
 395                                     pipe_name(intel_crtc->pipe),
 396                                     cur_size, max_size);
 397                         fb = NULL;
 398                         break;
 399                 }
 400
 401                 drm_dbg_kms(&i915->drm,
 402                             "fb big enough for plane %c (%d >= %d)\n",
 403                             pipe_name(intel_crtc->pipe),
 404                             max_size, cur_size);
 405         }
 406
 407         if (!fb) {
 408                 drm_dbg_kms(&i915->drm,
 409                             "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                 drm_WARN(dev, !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_dbg_kms(&i915->drm, "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 (drm_WARN_ON(dev, !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);
 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         return 0;
 477 }
 478
 479 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 480 {
 481         struct intel_fbdev *ifbdev = data;
 482
 483         /* Due to peculiar init order wrt to hpd handling this is separate. */
 484         if (drm_fb_helper_initial_config(&ifbdev->helper,
 485                                          ifbdev->preferred_bpp))
 486                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 487 }
 488
 489 void intel_fbdev_initial_config_async(struct drm_device *dev)
 490 {
 491         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 492
 493         if (!ifbdev)
 494                 return;
 495
 496         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 497 }
 498
 499 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 500 {
 501         if (!ifbdev->cookie)
 502                 return;
 503
 504         /* Only serialises with all preceding async calls, hence +1 */
 505         async_synchronize_cookie(ifbdev->cookie + 1);
 506         ifbdev->cookie = 0;
 507 }
 508
 509 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 510 {
 511         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 512
 513         if (!ifbdev)
 514                 return;
 515
 516         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 517         if (!current_is_async())
 518                 intel_fbdev_sync(ifbdev);
 519
 520         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 521 }
 522
 523 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 524 {
 525         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 526
 527         if (!ifbdev)
 528                 return;
 529
 530         intel_fbdev_destroy(ifbdev);
 531 }
 532
 533 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 534  * processing, fbdev will perform a full connector reprobe if a hotplug event
 535  * was received while HPD was suspended.
 536  */
 537 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 538 {
 539         struct intel_fbdev *ifbdev = i915->fbdev;
 540         bool send_hpd = false;
 541
 542         mutex_lock(&ifbdev->hpd_lock);
 543         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 544         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 545         ifbdev->hpd_waiting = false;
 546         mutex_unlock(&ifbdev->hpd_lock);
 547
 548         if (send_hpd) {
 549                 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
 550                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 551         }
 552 }
 553
 554 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 555 {
 556         struct drm_i915_private *dev_priv = to_i915(dev);
 557         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 558         struct fb_info *info;
 559
 560         if (!ifbdev || !ifbdev->vma)
 561                 return;
 562
 563         info = ifbdev->helper.fbdev;
 564
 565         if (synchronous) {
 566                 /* Flush any pending work to turn the console on, and then
 567                  * wait to turn it off. It must be synchronous as we are
 568                  * about to suspend or unload the driver.
 569                  *
 570                  * Note that from within the work-handler, we cannot flush
 571                  * ourselves, so only flush outstanding work upon suspend!
 572                  */
 573                 if (state != FBINFO_STATE_RUNNING)
 574                         flush_work(&dev_priv->fbdev_suspend_work);
 575
 576                 console_lock();
 577         } else {
 578                 /*
 579                  * The console lock can be pretty contented on resume due
 580                  * to all the printk activity.  Try to keep it out of the hot
 581                  * path of resume if possible.
 582                  */
 583                 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
 584                 if (!console_trylock()) {
 585                         /* Don't block our own workqueue as this can
 586                          * be run in parallel with other i915.ko tasks.
 587                          */
 588                         schedule_work(&dev_priv->fbdev_suspend_work);
 589                         return;
 590                 }
 591         }
 592
 593         /* On resume from hibernation: If the object is shmemfs backed, it has
 594          * been restored from swap. If the object is stolen however, it will be
 595          * full of whatever garbage was left in there.
 596          */
 597         if (state == FBINFO_STATE_RUNNING &&
 598             !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 599                 memset_io(info->screen_base, 0, info->screen_size);
 600
 601         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 602         console_unlock();
 603
 604         intel_fbdev_hpd_set_suspend(dev_priv, state);
 605 }
 606
 607 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 608 {
 609         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 610         bool send_hpd;
 611
 612         if (!ifbdev)
 613                 return;
 614
 615         intel_fbdev_sync(ifbdev);
 616
 617         mutex_lock(&ifbdev->hpd_lock);
 618         send_hpd = !ifbdev->hpd_suspended;
 619         ifbdev->hpd_waiting = true;
 620         mutex_unlock(&ifbdev->hpd_lock);
 621
 622         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 623                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 624 }
 625
 626 void intel_fbdev_restore_mode(struct drm_device *dev)
 627 {
 628         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 629
 630         if (!ifbdev)
 631                 return;
 632
 633         intel_fbdev_sync(ifbdev);
 634         if (!ifbdev->vma)
 635                 return;
 636
 637         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 638                 intel_fbdev_invalidate(ifbdev);
 639 }