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 "gem/i915_gem_lmem.h"
  45
  46 #include "i915_drv.h"
  47 #include "intel_display_types.h"
  48 #include "intel_fb.h"
  49 #include "intel_fbdev.h"
  50 #include "intel_frontbuffer.h"
  51
  52 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
  53 {
  54         return ifbdev->fb->frontbuffer;
  55 }
  56
  57 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  58 {
  59         intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
  60 }
  61
  62 static int intel_fbdev_set_par(struct fb_info *info)
  63 {
  64         struct drm_fb_helper *fb_helper = info->par;
  65         struct intel_fbdev *ifbdev =
  66                 container_of(fb_helper, struct intel_fbdev, helper);
  67         int ret;
  68
  69         ret = drm_fb_helper_set_par(info);
  70         if (ret == 0)
  71                 intel_fbdev_invalidate(ifbdev);
  72
  73         return ret;
  74 }
  75
  76 static int intel_fbdev_blank(int blank, struct fb_info *info)
  77 {
  78         struct drm_fb_helper *fb_helper = info->par;
  79         struct intel_fbdev *ifbdev =
  80                 container_of(fb_helper, struct intel_fbdev, helper);
  81         int ret;
  82
  83         ret = drm_fb_helper_blank(blank, info);
  84         if (ret == 0)
  85                 intel_fbdev_invalidate(ifbdev);
  86
  87         return ret;
  88 }
  89
  90 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  91                                    struct fb_info *info)
  92 {
  93         struct drm_fb_helper *fb_helper = info->par;
  94         struct intel_fbdev *ifbdev =
  95                 container_of(fb_helper, struct intel_fbdev, helper);
  96         int ret;
  97
  98         ret = drm_fb_helper_pan_display(var, info);
  99         if (ret == 0)
 100                 intel_fbdev_invalidate(ifbdev);
 101
 102         return ret;
 103 }
 104
 105 static const struct fb_ops intelfb_ops = {
 106         .owner = THIS_MODULE,
 107         DRM_FB_HELPER_DEFAULT_OPS,
 108         .fb_set_par = intel_fbdev_set_par,
 109         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 110         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 111         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 112         .fb_pan_display = intel_fbdev_pan_display,
 113         .fb_blank = intel_fbdev_blank,
 114 };
 115
 116 static int intelfb_alloc(struct drm_fb_helper *helper,
 117                          struct drm_fb_helper_surface_size *sizes)
 118 {
 119         struct intel_fbdev *ifbdev =
 120                 container_of(helper, struct intel_fbdev, helper);
 121         struct drm_framebuffer *fb;
 122         struct drm_device *dev = helper->dev;
 123         struct drm_i915_private *dev_priv = to_i915(dev);
 124         struct drm_mode_fb_cmd2 mode_cmd = {};
 125         struct drm_i915_gem_object *obj;
 126         int size;
 127
 128         /* we don't do packed 24bpp */
 129         if (sizes->surface_bpp == 24)
 130                 sizes->surface_bpp = 32;
 131
 132         mode_cmd.width = sizes->surface_width;
 133         mode_cmd.height = sizes->surface_height;
 134
 135         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 136                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 137         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 138                                                           sizes->surface_depth);
 139
 140         size = mode_cmd.pitches[0] * mode_cmd.height;
 141         size = PAGE_ALIGN(size);
 142
 143         obj = ERR_PTR(-ENODEV);
 144         if (HAS_LMEM(dev_priv)) {
 145                 obj = i915_gem_object_create_lmem(dev_priv, size,
 146                                                   I915_BO_ALLOC_CONTIGUOUS);
 147         } else {
 148                 /*
 149                  * If the FB is too big, just don't use it since fbdev is not very
 150                  * important and we should probably use that space with FBC or other
 151                  * features.
 152                  */
 153                 if (size * 2 < dev_priv->stolen_usable_size)
 154                         obj = i915_gem_object_create_stolen(dev_priv, size);
 155                 if (IS_ERR(obj))
 156                         obj = i915_gem_object_create_shmem(dev_priv, size);
 157         }
 158
 159         if (IS_ERR(obj)) {
 160                 drm_err(&dev_priv->drm, "failed to allocate framebuffer\n");
 161                 return PTR_ERR(obj);
 162         }
 163
 164         fb = intel_framebuffer_create(obj, &mode_cmd);
 165         i915_gem_object_put(obj);
 166         if (IS_ERR(fb))
 167                 return PTR_ERR(fb);
 168
 169         ifbdev->fb = to_intel_framebuffer(fb);
 170         return 0;
 171 }
 172
 173 static int intelfb_create(struct drm_fb_helper *helper,
 174                           struct drm_fb_helper_surface_size *sizes)
 175 {
 176         struct intel_fbdev *ifbdev =
 177                 container_of(helper, struct intel_fbdev, helper);
 178         struct intel_framebuffer *intel_fb = ifbdev->fb;
 179         struct drm_device *dev = helper->dev;
 180         struct drm_i915_private *dev_priv = to_i915(dev);
 181         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 182         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 183         const struct i915_ggtt_view view = {
 184                 .type = I915_GGTT_VIEW_NORMAL,
 185         };
 186         intel_wakeref_t wakeref;
 187         struct fb_info *info;
 188         struct i915_vma *vma;
 189         unsigned long flags = 0;
 190         bool prealloc = false;
 191         void __iomem *vaddr;
 192         struct drm_i915_gem_object *obj;
 193         int ret;
 194
 195         if (intel_fb &&
 196             (sizes->fb_width > intel_fb->base.width ||
 197              sizes->fb_height > intel_fb->base.height)) {
 198                 drm_dbg_kms(&dev_priv->drm,
 199                             "BIOS fb too small (%dx%d), we require (%dx%d),"
 200                             " releasing it\n",
 201                             intel_fb->base.width, intel_fb->base.height,
 202                             sizes->fb_width, sizes->fb_height);
 203                 drm_framebuffer_put(&intel_fb->base);
 204                 intel_fb = ifbdev->fb = NULL;
 205         }
 206         if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
 207                 drm_dbg_kms(&dev_priv->drm,
 208                             "no BIOS fb, allocating a new one\n");
 209                 ret = intelfb_alloc(helper, sizes);
 210                 if (ret)
 211                         return ret;
 212                 intel_fb = ifbdev->fb;
 213         } else {
 214                 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 215                 prealloc = true;
 216                 sizes->fb_width = intel_fb->base.width;
 217                 sizes->fb_height = intel_fb->base.height;
 218         }
 219
 220         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 221
 222         /* Pin the GGTT vma for our access via info->screen_base.
 223          * This also validates that any existing fb inherited from the
 224          * BIOS is suitable for own access.
 225          */
 226         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
 227                                          &view, false, &flags);
 228         if (IS_ERR(vma)) {
 229                 ret = PTR_ERR(vma);
 230                 goto out_unlock;
 231         }
 232
 233         intel_frontbuffer_flush(to_frontbuffer(ifbdev), ORIGIN_DIRTYFB);
 234
 235         info = drm_fb_helper_alloc_fbi(helper);
 236         if (IS_ERR(info)) {
 237                 drm_err(&dev_priv->drm, "Failed to allocate fb_info\n");
 238                 ret = PTR_ERR(info);
 239                 goto out_unpin;
 240         }
 241
 242         ifbdev->helper.fb = &ifbdev->fb->base;
 243
 244         info->fbops = &intelfb_ops;
 245
 246         /* setup aperture base/size for vesafb takeover */
 247         obj = intel_fb_obj(&intel_fb->base);
 248         if (i915_gem_object_is_lmem(obj)) {
 249                 struct intel_memory_region *mem = obj->mm.region;
 250
 251                 info->apertures->ranges[0].base = mem->io_start;
 252                 info->apertures->ranges[0].size = mem->total;
 253
 254                 /* Use fbdev's framebuffer from lmem for discrete */
 255                 info->fix.smem_start =
 256                         (unsigned long)(mem->io_start +
 257                                         i915_gem_object_get_dma_address(obj, 0));
 258                 info->fix.smem_len = obj->base.size;
 259         } else {
 260                 info->apertures->ranges[0].base = ggtt->gmadr.start;
 261                 info->apertures->ranges[0].size = ggtt->mappable_end;
 262
 263                 /* Our framebuffer is the entirety of fbdev's system memory */
 264                 info->fix.smem_start =
 265                         (unsigned long)(ggtt->gmadr.start + vma->node.start);
 266                 info->fix.smem_len = vma->node.size;
 267         }
 268
 269         vaddr = i915_vma_pin_iomap(vma);
 270         if (IS_ERR(vaddr)) {
 271                 drm_err(&dev_priv->drm,
 272                         "Failed to remap framebuffer into virtual memory\n");
 273                 ret = PTR_ERR(vaddr);
 274                 goto out_unpin;
 275         }
 276         info->screen_base = vaddr;
 277         info->screen_size = vma->node.size;
 278
 279         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 280
 281         /* If the object is shmemfs backed, it will have given us zeroed pages.
 282          * If the object is stolen however, it will be full of whatever
 283          * garbage was left in there.
 284          */
 285         if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
 286                 memset_io(info->screen_base, 0, info->screen_size);
 287
 288         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 289
 290         drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
 291                     ifbdev->fb->base.width, ifbdev->fb->base.height,
 292                     i915_ggtt_offset(vma));
 293         ifbdev->vma = vma;
 294         ifbdev->vma_flags = flags;
 295
 296         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 297         vga_switcheroo_client_fb_set(pdev, info);
 298         return 0;
 299
 300 out_unpin:
 301         intel_unpin_fb_vma(vma, flags);
 302 out_unlock:
 303         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 304         return ret;
 305 }
 306
 307 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 308         .fb_probe = intelfb_create,
 309 };
 310
 311 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 312 {
 313         /* We rely on the object-free to release the VMA pinning for
 314          * the info->screen_base mmaping. Leaking the VMA is simpler than
 315          * trying to rectify all the possible error paths leading here.
 316          */
 317
 318         drm_fb_helper_fini(&ifbdev->helper);
 319
 320         if (ifbdev->vma)
 321                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 322
 323         if (ifbdev->fb)
 324                 drm_framebuffer_remove(&ifbdev->fb->base);
 325
 326         kfree(ifbdev);
 327 }
 328
 329 /*
 330  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 331  * The core display code will have read out the current plane configuration,
 332  * so we use that to figure out if there's an object for us to use as the
 333  * fb, and if so, we re-use it for the fbdev configuration.
 334  *
 335  * Note we only support a single fb shared across pipes for boot (mostly for
 336  * fbcon), so we just find the biggest and use that.
 337  */
 338 static bool intel_fbdev_init_bios(struct drm_device *dev,
 339                                   struct intel_fbdev *ifbdev)
 340 {
 341         struct drm_i915_private *i915 = to_i915(dev);
 342         struct intel_framebuffer *fb = NULL;
 343         struct intel_crtc *crtc;
 344         unsigned int max_size = 0;
 345
 346         /* Find the largest fb */
 347         for_each_intel_crtc(dev, crtc) {
 348                 struct intel_crtc_state *crtc_state =
 349                         to_intel_crtc_state(crtc->base.state);
 350                 struct intel_plane *plane =
 351                         to_intel_plane(crtc->base.primary);
 352                 struct intel_plane_state *plane_state =
 353                         to_intel_plane_state(plane->base.state);
 354                 struct drm_i915_gem_object *obj =
 355                         intel_fb_obj(plane_state->uapi.fb);
 356
 357                 if (!crtc_state->uapi.active) {
 358                         drm_dbg_kms(&i915->drm,
 359                                     "[CRTC:%d:%s] not active, skipping\n",
 360                                     crtc->base.base.id, crtc->base.name);
 361                         continue;
 362                 }
 363
 364                 if (!obj) {
 365                         drm_dbg_kms(&i915->drm,
 366                                     "[PLANE:%d:%s] no fb, skipping\n",
 367                                     plane->base.base.id, plane->base.name);
 368                         continue;
 369                 }
 370
 371                 if (obj->base.size > max_size) {
 372                         drm_dbg_kms(&i915->drm,
 373                                     "found possible fb from [PLANE:%d:%s]\n",
 374                                     plane->base.base.id, plane->base.name);
 375                         fb = to_intel_framebuffer(plane_state->uapi.fb);
 376                         max_size = obj->base.size;
 377                 }
 378         }
 379
 380         if (!fb) {
 381                 drm_dbg_kms(&i915->drm,
 382                             "no active fbs found, not using BIOS config\n");
 383                 goto out;
 384         }
 385
 386         /* Now make sure all the pipes will fit into it */
 387         for_each_intel_crtc(dev, crtc) {
 388                 struct intel_crtc_state *crtc_state =
 389                         to_intel_crtc_state(crtc->base.state);
 390                 struct intel_plane *plane =
 391                         to_intel_plane(crtc->base.primary);
 392                 unsigned int cur_size;
 393
 394                 if (!crtc_state->uapi.active) {
 395                         drm_dbg_kms(&i915->drm,
 396                                     "[CRTC:%d:%s] not active, skipping\n",
 397                                     crtc->base.base.id, crtc->base.name);
 398                         continue;
 399                 }
 400
 401                 drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
 402                             plane->base.base.id, plane->base.name);
 403
 404                 /*
 405                  * See if the plane fb we found above will fit on this
 406                  * pipe.  Note we need to use the selected fb's pitch and bpp
 407                  * rather than the current pipe's, since they differ.
 408                  */
 409                 cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
 410                 cur_size = cur_size * fb->base.format->cpp[0];
 411                 if (fb->base.pitches[0] < cur_size) {
 412                         drm_dbg_kms(&i915->drm,
 413                                     "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
 414                                     plane->base.base.id, plane->base.name,
 415                                     cur_size, fb->base.pitches[0]);
 416                         fb = NULL;
 417                         break;
 418                 }
 419
 420                 cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
 421                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 422                 cur_size *= fb->base.pitches[0];
 423                 drm_dbg_kms(&i915->drm,
 424                             "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
 425                             crtc->base.base.id, crtc->base.name,
 426                             crtc_state->uapi.adjusted_mode.crtc_hdisplay,
 427                             crtc_state->uapi.adjusted_mode.crtc_vdisplay,
 428                             fb->base.format->cpp[0] * 8,
 429                             cur_size);
 430
 431                 if (cur_size > max_size) {
 432                         drm_dbg_kms(&i915->drm,
 433                                     "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
 434                                     plane->base.base.id, plane->base.name,
 435                                     cur_size, max_size);
 436                         fb = NULL;
 437                         break;
 438                 }
 439
 440                 drm_dbg_kms(&i915->drm,
 441                             "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
 442                             plane->base.base.id, plane->base.name,
 443                             max_size, cur_size);
 444         }
 445
 446         if (!fb) {
 447                 drm_dbg_kms(&i915->drm,
 448                             "BIOS fb not suitable for all pipes, not using\n");
 449                 goto out;
 450         }
 451
 452         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 453         ifbdev->fb = fb;
 454
 455         drm_framebuffer_get(&ifbdev->fb->base);
 456
 457         /* Final pass to check if any active pipes don't have fbs */
 458         for_each_intel_crtc(dev, crtc) {
 459                 struct intel_crtc_state *crtc_state =
 460                         to_intel_crtc_state(crtc->base.state);
 461                 struct intel_plane *plane =
 462                         to_intel_plane(crtc->base.primary);
 463                 struct intel_plane_state *plane_state =
 464                         to_intel_plane_state(plane->base.state);
 465
 466                 if (!crtc_state->uapi.active)
 467                         continue;
 468
 469                 drm_WARN(dev, !plane_state->uapi.fb,
 470                          "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
 471                          plane->base.base.id, plane->base.name);
 472         }
 473
 474
 475         drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
 476         return true;
 477
 478 out:
 479
 480         return false;
 481 }
 482
 483 static void intel_fbdev_suspend_worker(struct work_struct *work)
 484 {
 485         intel_fbdev_set_suspend(&container_of(work,
 486                                               struct drm_i915_private,
 487                                               fbdev_suspend_work)->drm,
 488                                 FBINFO_STATE_RUNNING,
 489                                 true);
 490 }
 491
 492 int intel_fbdev_init(struct drm_device *dev)
 493 {
 494         struct drm_i915_private *dev_priv = to_i915(dev);
 495         struct intel_fbdev *ifbdev;
 496         int ret;
 497
 498         if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
 499                 return -ENODEV;
 500
 501         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 502         if (ifbdev == NULL)
 503                 return -ENOMEM;
 504
 505         mutex_init(&ifbdev->hpd_lock);
 506         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 507
 508         if (!intel_fbdev_init_bios(dev, ifbdev))
 509                 ifbdev->preferred_bpp = 32;
 510
 511         ret = drm_fb_helper_init(dev, &ifbdev->helper);
 512         if (ret) {
 513                 kfree(ifbdev);
 514                 return ret;
 515         }
 516
 517         dev_priv->fbdev = ifbdev;
 518         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 519
 520         return 0;
 521 }
 522
 523 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 524 {
 525         struct intel_fbdev *ifbdev = data;
 526
 527         /* Due to peculiar init order wrt to hpd handling this is separate. */
 528         if (drm_fb_helper_initial_config(&ifbdev->helper,
 529                                          ifbdev->preferred_bpp))
 530                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 531 }
 532
 533 void intel_fbdev_initial_config_async(struct drm_device *dev)
 534 {
 535         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 536
 537         if (!ifbdev)
 538                 return;
 539
 540         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 541 }
 542
 543 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 544 {
 545         if (!ifbdev->cookie)
 546                 return;
 547
 548         /* Only serialises with all preceding async calls, hence +1 */
 549         async_synchronize_cookie(ifbdev->cookie + 1);
 550         ifbdev->cookie = 0;
 551 }
 552
 553 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 554 {
 555         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 556
 557         if (!ifbdev)
 558                 return;
 559
 560         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 561         if (!current_is_async())
 562                 intel_fbdev_sync(ifbdev);
 563
 564         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 565 }
 566
 567 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 568 {
 569         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 570
 571         if (!ifbdev)
 572                 return;
 573
 574         intel_fbdev_destroy(ifbdev);
 575 }
 576
 577 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 578  * processing, fbdev will perform a full connector reprobe if a hotplug event
 579  * was received while HPD was suspended.
 580  */
 581 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 582 {
 583         struct intel_fbdev *ifbdev = i915->fbdev;
 584         bool send_hpd = false;
 585
 586         mutex_lock(&ifbdev->hpd_lock);
 587         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 588         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 589         ifbdev->hpd_waiting = false;
 590         mutex_unlock(&ifbdev->hpd_lock);
 591
 592         if (send_hpd) {
 593                 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
 594                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 595         }
 596 }
 597
 598 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 599 {
 600         struct drm_i915_private *dev_priv = to_i915(dev);
 601         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 602         struct fb_info *info;
 603
 604         if (!ifbdev || !ifbdev->vma)
 605                 return;
 606
 607         info = ifbdev->helper.fbdev;
 608
 609         if (synchronous) {
 610                 /* Flush any pending work to turn the console on, and then
 611                  * wait to turn it off. It must be synchronous as we are
 612                  * about to suspend or unload the driver.
 613                  *
 614                  * Note that from within the work-handler, we cannot flush
 615                  * ourselves, so only flush outstanding work upon suspend!
 616                  */
 617                 if (state != FBINFO_STATE_RUNNING)
 618                         flush_work(&dev_priv->fbdev_suspend_work);
 619
 620                 console_lock();
 621         } else {
 622                 /*
 623                  * The console lock can be pretty contented on resume due
 624                  * to all the printk activity.  Try to keep it out of the hot
 625                  * path of resume if possible.
 626                  */
 627                 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
 628                 if (!console_trylock()) {
 629                         /* Don't block our own workqueue as this can
 630                          * be run in parallel with other i915.ko tasks.
 631                          */
 632                         schedule_work(&dev_priv->fbdev_suspend_work);
 633                         return;
 634                 }
 635         }
 636
 637         /* On resume from hibernation: If the object is shmemfs backed, it has
 638          * been restored from swap. If the object is stolen however, it will be
 639          * full of whatever garbage was left in there.
 640          */
 641         if (state == FBINFO_STATE_RUNNING &&
 642             !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 643                 memset_io(info->screen_base, 0, info->screen_size);
 644
 645         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 646         console_unlock();
 647
 648         intel_fbdev_hpd_set_suspend(dev_priv, state);
 649 }
 650
 651 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 652 {
 653         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 654         bool send_hpd;
 655
 656         if (!ifbdev)
 657                 return;
 658
 659         intel_fbdev_sync(ifbdev);
 660
 661         mutex_lock(&ifbdev->hpd_lock);
 662         send_hpd = !ifbdev->hpd_suspended;
 663         ifbdev->hpd_waiting = true;
 664         mutex_unlock(&ifbdev->hpd_lock);
 665
 666         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 667                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 668 }
 669
 670 void intel_fbdev_restore_mode(struct drm_device *dev)
 671 {
 672         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 673
 674         if (!ifbdev)
 675                 return;
 676
 677         intel_fbdev_sync(ifbdev);
 678         if (!ifbdev->vma)
 679                 return;
 680
 681         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 682                 intel_fbdev_invalidate(ifbdev);
 683 }