drivers/gpu/drm/i915/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/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include <linux/mm.h>
  32 #include <linux/tty.h>
  33 #include <linux/sysrq.h>
  34 #include <linux/delay.h>
  35 #include <linux/fb.h>
  36 #include <linux/init.h>
  37 #include <linux/vga_switcheroo.h>
  38
  39 #include <drm/drmP.h>
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include "intel_drv.h"
  43 #include <drm/i915_drm.h>
  44 #include "i915_drv.h"
  45
  46 static struct fb_ops intelfb_ops = {
  47         .owner = THIS_MODULE,
  48         .fb_check_var = drm_fb_helper_check_var,
  49         .fb_set_par = drm_fb_helper_set_par,
  50         .fb_fillrect = cfb_fillrect,
  51         .fb_copyarea = cfb_copyarea,
  52         .fb_imageblit = cfb_imageblit,
  53         .fb_pan_display = drm_fb_helper_pan_display,
  54         .fb_blank = drm_fb_helper_blank,
  55         .fb_setcmap = drm_fb_helper_setcmap,
  56         .fb_debug_enter = drm_fb_helper_debug_enter,
  57         .fb_debug_leave = drm_fb_helper_debug_leave,
  58 };
  59
  60 static int intelfb_alloc(struct drm_fb_helper *helper,
  61                          struct drm_fb_helper_surface_size *sizes)
  62 {
  63         struct intel_fbdev *ifbdev =
  64                 container_of(helper, struct intel_fbdev, helper);
  65         struct drm_device *dev = helper->dev;
  66         struct drm_mode_fb_cmd2 mode_cmd = {};
  67         struct drm_i915_gem_object *obj;
  68         int size, ret;
  69
  70         /* we don't do packed 24bpp */
  71         if (sizes->surface_bpp == 24)
  72                 sizes->surface_bpp = 32;
  73
  74         mode_cmd.width = sizes->surface_width;
  75         mode_cmd.height = sizes->surface_height;
  76
  77         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
  78                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
  79         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  80                                                           sizes->surface_depth);
  81
  82         size = mode_cmd.pitches[0] * mode_cmd.height;
  83         size = ALIGN(size, PAGE_SIZE);
  84         obj = i915_gem_object_create_stolen(dev, size);
  85         if (obj == NULL)
  86                 obj = i915_gem_alloc_object(dev, size);
  87         if (!obj) {
  88                 DRM_ERROR("failed to allocate framebuffer\n");
  89                 ret = -ENOMEM;
  90                 goto out;
  91         }
  92
  93         /* Flush everything out, we'll be doing GTT only from now on */
  94         ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
  95         if (ret) {
  96                 DRM_ERROR("failed to pin fb: %d\n", ret);
  97                 goto out_unref;
  98         }
  99
 100         ret = intel_framebuffer_init(dev, &ifbdev->ifb, &mode_cmd, obj);
 101         if (ret)
 102                 goto out_unpin;
 103
 104         return 0;
 105
 106 out_unpin:
 107         i915_gem_object_unpin(obj);
 108 out_unref:
 109         drm_gem_object_unreference(&obj->base);
 110 out:
 111         return ret;
 112 }
 113
 114 static int intelfb_create(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 intel_framebuffer *intel_fb = &ifbdev->ifb;
 120         struct drm_device *dev = helper->dev;
 121         struct drm_i915_private *dev_priv = dev->dev_private;
 122         struct fb_info *info;
 123         struct drm_framebuffer *fb;
 124         struct drm_i915_gem_object *obj;
 125         int size, ret;
 126         bool prealloc = false;
 127
 128         mutex_lock(&dev->struct_mutex);
 129
 130         if (!intel_fb->obj) {
 131                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 132                 ret = intelfb_alloc(helper, sizes);
 133                 if (ret)
 134                         goto out_unlock;
 135         } else {
 136                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 137                 prealloc = true;
 138                 sizes->fb_width = intel_fb->base.width;
 139                 sizes->fb_height = intel_fb->base.height;
 140         }
 141
 142         obj = intel_fb->obj;
 143         size = obj->base.size;
 144
 145         info = framebuffer_alloc(0, &dev->pdev->dev);
 146         if (!info) {
 147                 ret = -ENOMEM;
 148                 goto out_unpin;
 149         }
 150
 151         info->par = helper;
 152
 153         fb = &ifbdev->ifb.base;
 154
 155         ifbdev->helper.fb = fb;
 156         ifbdev->helper.fbdev = info;
 157
 158         strcpy(info->fix.id, "inteldrmfb");
 159
 160         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 161         info->fbops = &intelfb_ops;
 162
 163         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 164         if (ret) {
 165                 ret = -ENOMEM;
 166                 goto out_unpin;
 167         }
 168         /* setup aperture base/size for vesafb takeover */
 169         info->apertures = alloc_apertures(1);
 170         if (!info->apertures) {
 171                 ret = -ENOMEM;
 172                 goto out_unpin;
 173         }
 174         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 175         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 176
 177         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 178         info->fix.smem_len = size;
 179
 180         info->screen_base =
 181                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 182                            size);
 183         if (!info->screen_base) {
 184                 ret = -ENOSPC;
 185                 goto out_unpin;
 186         }
 187         info->screen_size = size;
 188
 189         /* This driver doesn't need a VT switch to restore the mode on resume */
 190         info->skip_vt_switch = true;
 191
 192         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 193         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 194
 195         /* If the object is shmemfs backed, it will have given us zeroed pages.
 196          * If the object is stolen however, it will be full of whatever
 197          * garbage was left in there.
 198          */
 199         if (ifbdev->ifb.obj->stolen && !prealloc)
 200                 memset_io(info->screen_base, 0, info->screen_size);
 201
 202         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 203
 204         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 205                       fb->width, fb->height,
 206                       i915_gem_obj_ggtt_offset(obj), obj);
 207
 208         mutex_unlock(&dev->struct_mutex);
 209         vga_switcheroo_client_fb_set(dev->pdev, info);
 210         return 0;
 211
 212 out_unpin:
 213         i915_gem_object_unpin(obj);
 214         drm_gem_object_unreference(&obj->base);
 215 out_unlock:
 216         mutex_unlock(&dev->struct_mutex);
 217         return ret;
 218 }
 219
 220 /** Sets the color ramps on behalf of RandR */
 221 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 222                                     u16 blue, int regno)
 223 {
 224         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 225
 226         intel_crtc->lut_r[regno] = red >> 8;
 227         intel_crtc->lut_g[regno] = green >> 8;
 228         intel_crtc->lut_b[regno] = blue >> 8;
 229 }
 230
 231 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 232                                     u16 *blue, int regno)
 233 {
 234         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 235
 236         *red = intel_crtc->lut_r[regno] << 8;
 237         *green = intel_crtc->lut_g[regno] << 8;
 238         *blue = intel_crtc->lut_b[regno] << 8;
 239 }
 240
 241 static struct drm_fb_helper_crtc *
 242 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 243 {
 244         int i;
 245
 246         for (i = 0; i < fb_helper->crtc_count; i++)
 247                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 248                         return &fb_helper->crtc_info[i];
 249
 250         return NULL;
 251 }
 252
 253 /*
 254  * Try to read the BIOS display configuration and use it for the initial
 255  * fb configuration.
 256  *
 257  * The BIOS or boot loader will generally create an initial display
 258  * configuration for us that includes some set of active pipes and displays.
 259  * This routine tries to figure out which pipes and connectors are active
 260  * and stuffs them into the crtcs and modes array given to us by the
 261  * drm_fb_helper code.
 262  *
 263  * The overall sequence is:
 264  *   intel_fbdev_init - from driver load
 265  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 266  *     drm_fb_helper_init - build fb helper structs
 267  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 268  *   intel_fbdev_initial_config - apply the config
 269  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 270  *         drm_setup_crtcs - build crtc config for fbdev
 271  *           intel_fb_initial_config - find active connectors etc
 272  *         drm_fb_helper_single_fb_probe - set up fbdev
 273  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 274  *
 275  * Note that we don't make special consideration whether we could actually
 276  * switch to the selected modes without a full modeset. E.g. when the display
 277  * is in VGA mode we need to recalculate watermarks and set a new high-res
 278  * framebuffer anyway.
 279  */
 280 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 281                                     struct drm_fb_helper_crtc **crtcs,
 282                                     struct drm_display_mode **modes,
 283                                     bool *enabled, int width, int height)
 284 {
 285         int i, j;
 286
 287         for (i = 0; i < fb_helper->connector_count; i++) {
 288                 struct drm_fb_helper_connector *fb_conn;
 289                 struct drm_connector *connector;
 290                 struct drm_encoder *encoder;
 291                 struct drm_fb_helper_crtc *new_crtc;
 292
 293                 fb_conn = fb_helper->connector_info[i];
 294                 connector = fb_conn->connector;
 295                 if (!enabled[i]) {
 296                         DRM_DEBUG_KMS("connector %d not enabled, skipping\n",
 297                                       connector->base.id);
 298                         continue;
 299                 }
 300
 301                 encoder = connector->encoder;
 302                 if (!encoder || WARN_ON(!encoder->crtc)) {
 303                         DRM_DEBUG_KMS("connector %d has no encoder or crtc, skipping\n",
 304                                       connector->base.id);
 305                         enabled[i] = false;
 306                         continue;
 307                 }
 308
 309                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 310
 311                 /*
 312                  * Make sure we're not trying to drive multiple connectors
 313                  * with a single CRTC, since our cloning support may not
 314                  * match the BIOS.
 315                  */
 316                 for (j = 0; j < fb_helper->connector_count; j++) {
 317                         if (crtcs[j] == new_crtc)
 318                                 return false;
 319                 }
 320
 321                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
 322                               fb_conn->connector->base.id);
 323
 324                 /* go for command line mode first */
 325                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 326
 327                 /* try for preferred next */
 328                 if (!modes[i]) {
 329                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
 330                                       fb_conn->connector->base.id);
 331                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 332                                                           height);
 333                 }
 334
 335                 /* last resort: use current mode */
 336                 if (!modes[i]) {
 337                         /*
 338                          * IMPORTANT: We want to use the adjusted mode (i.e.
 339                          * after the panel fitter upscaling) as the initial
 340                          * config, not the input mode, which is what crtc->mode
 341                          * usually contains. But since our current fastboot
 342                          * code puts a mode derived from the post-pfit timings
 343                          * into crtc->mode this works out correctly. We don't
 344                          * use hwmode anywhere right now, so use it for this
 345                          * since the fb helper layer wants a pointer to
 346                          * something we own.
 347                          */
 348                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
 349                                                     &to_intel_crtc(encoder->crtc)->config);
 350                         modes[i] = &encoder->crtc->hwmode;
 351                 }
 352                 crtcs[i] = new_crtc;
 353
 354                 DRM_DEBUG_KMS("connector %s on crtc %d: %s\n",
 355                               drm_get_connector_name(connector),
 356                               encoder->crtc->base.id,
 357                               modes[i]->name);
 358         }
 359
 360         return true;
 361 }
 362
 363 static struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 364         .initial_config = intel_fb_initial_config,
 365         .gamma_set = intel_crtc_fb_gamma_set,
 366         .gamma_get = intel_crtc_fb_gamma_get,
 367         .fb_probe = intelfb_create,
 368 };
 369
 370 static void intel_fbdev_destroy(struct drm_device *dev,
 371                                 struct intel_fbdev *ifbdev)
 372 {
 373         if (ifbdev->helper.fbdev) {
 374                 struct fb_info *info = ifbdev->helper.fbdev;
 375
 376                 unregister_framebuffer(info);
 377                 iounmap(info->screen_base);
 378                 if (info->cmap.len)
 379                         fb_dealloc_cmap(&info->cmap);
 380
 381                 framebuffer_release(info);
 382         }
 383
 384         drm_fb_helper_fini(&ifbdev->helper);
 385
 386         drm_framebuffer_unregister_private(&ifbdev->ifb.base);
 387         intel_framebuffer_fini(&ifbdev->ifb);
 388 }
 389
 390 /*
 391  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 392  * The core display code will have read out the current plane configuration,
 393  * so we use that to figure out if there's an object for us to use as the
 394  * fb, and if so, we re-use it for the fbdev configuration.
 395  *
 396  * Note we only support a single fb shared across pipes for boot (mostly for
 397  * fbcon), so we just find the biggest and use that.
 398  */
 399 static bool intel_fbdev_init_bios(struct drm_device *dev,
 400                                  struct intel_fbdev *ifbdev)
 401 {
 402         struct intel_framebuffer *fb = NULL;
 403         struct drm_crtc *crtc;
 404         struct intel_crtc *intel_crtc;
 405         struct intel_plane_config *plane_config = NULL;
 406         unsigned int max_size = 0;
 407
 408         if (!i915_fastboot)
 409                 return false;
 410
 411         /* Find the largest fb */
 412         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 413                 intel_crtc = to_intel_crtc(crtc);
 414
 415                 if (!intel_crtc->active || !intel_crtc->plane_config.fb) {
 416                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 417                                       pipe_name(intel_crtc->pipe));
 418                         continue;
 419                 }
 420
 421                 if (intel_crtc->plane_config.size > max_size) {
 422                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 423                                       pipe_name(intel_crtc->pipe));
 424                         plane_config = &intel_crtc->plane_config;
 425                         fb = plane_config->fb;
 426                         max_size = plane_config->size;
 427                 }
 428         }
 429
 430         if (!fb) {
 431                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 432                 goto out;
 433         }
 434
 435         /* Now make sure all the pipes will fit into it */
 436         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 437                 unsigned int cur_size;
 438
 439                 intel_crtc = to_intel_crtc(crtc);
 440
 441                 if (!intel_crtc->active) {
 442                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 443                                       pipe_name(intel_crtc->pipe));
 444                         continue;
 445                 }
 446
 447                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 448                               pipe_name(intel_crtc->pipe));
 449
 450                 /*
 451                  * See if the plane fb we found above will fit on this
 452                  * pipe.  Note we need to use the selected fb's bpp rather
 453                  * than the current pipe's, since they could be different.
 454                  */
 455                 cur_size = intel_crtc->config.adjusted_mode.crtc_hdisplay *
 456                         intel_crtc->config.adjusted_mode.crtc_vdisplay;
 457                 DRM_DEBUG_KMS("pipe %c area: %d\n", pipe_name(intel_crtc->pipe),
 458                               cur_size);
 459                 cur_size *= fb->base.bits_per_pixel / 8;
 460                 DRM_DEBUG_KMS("total size %d (bpp %d)\n", cur_size,
 461                               fb->base.bits_per_pixel / 8);
 462
 463                 if (cur_size > max_size) {
 464                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 465                                       pipe_name(intel_crtc->pipe),
 466                                       cur_size, max_size);
 467                         plane_config = NULL;
 468                         fb = NULL;
 469                         break;
 470                 }
 471
 472                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 473                               pipe_name(intel_crtc->pipe),
 474                               max_size, cur_size);
 475         }
 476
 477         /* Free unused fbs */
 478         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 479                 struct intel_framebuffer *cur_fb;
 480
 481                 intel_crtc = to_intel_crtc(crtc);
 482                 cur_fb = intel_crtc->plane_config.fb;
 483
 484                 if (cur_fb && cur_fb != fb)
 485                         drm_framebuffer_unreference(&cur_fb->base);
 486         }
 487
 488         if (!fb) {
 489                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 490                 goto out;
 491         }
 492
 493         ifbdev->preferred_bpp = plane_config->fb->base.bits_per_pixel;
 494         ifbdev->ifb = *fb;
 495
 496         /* Assuming a single fb across all pipes here */
 497         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 498                 intel_crtc = to_intel_crtc(crtc);
 499
 500                 if (!intel_crtc->active)
 501                         continue;
 502
 503                 /*
 504                  * This should only fail on the first one so we don't need
 505                  * to cleanup any secondary crtc->fbs
 506                  */
 507                 if (intel_pin_and_fence_fb_obj(dev, fb->obj, NULL))
 508                         goto out_unref_obj;
 509
 510                 crtc->fb = &fb->base;
 511                 drm_gem_object_reference(&fb->obj->base);
 512                 drm_framebuffer_reference(&fb->base);
 513         }
 514
 515         /* Final pass to check if any active pipes don't have fbs */
 516         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 517                 intel_crtc = to_intel_crtc(crtc);
 518
 519                 if (!intel_crtc->active)
 520                         continue;
 521
 522                 WARN(!crtc->fb,
 523                      "re-used BIOS config but lost an fb on crtc %d\n",
 524                      crtc->base.id);
 525         }
 526
 527
 528         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 529         return true;
 530
 531 out_unref_obj:
 532         drm_framebuffer_unreference(&fb->base);
 533 out:
 534
 535         return false;
 536 }
 537
 538 int intel_fbdev_init(struct drm_device *dev)
 539 {
 540         struct intel_fbdev *ifbdev;
 541         struct drm_i915_private *dev_priv = dev->dev_private;
 542         int ret;
 543
 544         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 545                 return -ENODEV;
 546
 547         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 548         if (ifbdev == NULL)
 549                 return -ENOMEM;
 550
 551         ifbdev->helper.funcs = &intel_fb_helper_funcs;
 552         if (!intel_fbdev_init_bios(dev, ifbdev))
 553                 ifbdev->preferred_bpp = 32;
 554
 555         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 556                                  INTEL_INFO(dev)->num_pipes, 4);
 557         if (ret) {
 558                 kfree(ifbdev);
 559                 return ret;
 560         }
 561
 562         dev_priv->fbdev = ifbdev;
 563         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 564
 565         return 0;
 566 }
 567
 568 void intel_fbdev_initial_config(struct drm_device *dev)
 569 {
 570         struct drm_i915_private *dev_priv = dev->dev_private;
 571         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 572
 573         /* Due to peculiar init order wrt to hpd handling this is separate. */
 574         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 575 }
 576
 577 void intel_fbdev_fini(struct drm_device *dev)
 578 {
 579         struct drm_i915_private *dev_priv = dev->dev_private;
 580         if (!dev_priv->fbdev)
 581                 return;
 582
 583         intel_fbdev_destroy(dev, dev_priv->fbdev);
 584         kfree(dev_priv->fbdev);
 585         dev_priv->fbdev = NULL;
 586 }
 587
 588 void intel_fbdev_set_suspend(struct drm_device *dev, int state)
 589 {
 590         struct drm_i915_private *dev_priv = dev->dev_private;
 591         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 592         struct fb_info *info;
 593
 594         if (!ifbdev)
 595                 return;
 596
 597         info = ifbdev->helper.fbdev;
 598
 599         /* On resume from hibernation: If the object is shmemfs backed, it has
 600          * been restored from swap. If the object is stolen however, it will be
 601          * full of whatever garbage was left in there.
 602          */
 603         if (state == FBINFO_STATE_RUNNING && ifbdev->ifb.obj->stolen)
 604                 memset_io(info->screen_base, 0, info->screen_size);
 605
 606         fb_set_suspend(info, state);
 607 }
 608
 609 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 610 {
 611         struct drm_i915_private *dev_priv = dev->dev_private;
 612         if (dev_priv->fbdev)
 613                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 614 }
 615
 616 void intel_fbdev_restore_mode(struct drm_device *dev)
 617 {
 618         int ret;
 619         struct drm_i915_private *dev_priv = dev->dev_private;
 620
 621         if (!dev_priv->fbdev)
 622                 return;
 623
 624         drm_modeset_lock_all(dev);
 625
 626         ret = drm_fb_helper_restore_fbdev_mode(&dev_priv->fbdev->helper);
 627         if (ret)
 628                 DRM_DEBUG("failed to restore crtc mode\n");
 629
 630         drm_modeset_unlock_all(dev);
 631 }