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