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_framebuffer *fb;
  66         struct drm_device *dev = helper->dev;
  67         struct drm_mode_fb_cmd2 mode_cmd = {};
  68         struct drm_i915_gem_object *obj;
  69         int size, ret;
  70
  71         /* we don't do packed 24bpp */
  72         if (sizes->surface_bpp == 24)
  73                 sizes->surface_bpp = 32;
  74
  75         mode_cmd.width = sizes->surface_width;
  76         mode_cmd.height = sizes->surface_height;
  77
  78         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
  79                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
  80         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  81                                                           sizes->surface_depth);
  82
  83         size = mode_cmd.pitches[0] * mode_cmd.height;
  84         size = ALIGN(size, PAGE_SIZE);
  85         obj = i915_gem_object_create_stolen(dev, size);
  86         if (obj == NULL)
  87                 obj = i915_gem_alloc_object(dev, size);
  88         if (!obj) {
  89                 DRM_ERROR("failed to allocate framebuffer\n");
  90                 ret = -ENOMEM;
  91                 goto out;
  92         }
  93
  94         /* Flush everything out, we'll be doing GTT only from now on */
  95         ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
  96         if (ret) {
  97                 DRM_ERROR("failed to pin obj: %d\n", ret);
  98                 goto out_unref;
  99         }
 100
 101         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 102         if (IS_ERR(fb)) {
 103                 ret = PTR_ERR(fb);
 104                 goto out_unpin;
 105         }
 106
 107         ifbdev->fb = to_intel_framebuffer(fb);
 108
 109         return 0;
 110
 111 out_unpin:
 112         i915_gem_object_ggtt_unpin(obj);
 113 out_unref:
 114         drm_gem_object_unreference(&obj->base);
 115 out:
 116         return ret;
 117 }
 118
 119 static int intelfb_create(struct drm_fb_helper *helper,
 120                           struct drm_fb_helper_surface_size *sizes)
 121 {
 122         struct intel_fbdev *ifbdev =
 123                 container_of(helper, struct intel_fbdev, helper);
 124         struct intel_framebuffer *intel_fb = ifbdev->fb;
 125         struct drm_device *dev = helper->dev;
 126         struct drm_i915_private *dev_priv = dev->dev_private;
 127         struct fb_info *info;
 128         struct drm_framebuffer *fb;
 129         struct drm_i915_gem_object *obj;
 130         int size, ret;
 131         bool prealloc = false;
 132
 133         mutex_lock(&dev->struct_mutex);
 134
 135         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 136                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 137                 ret = intelfb_alloc(helper, sizes);
 138                 if (ret)
 139                         goto out_unlock;
 140                 intel_fb = ifbdev->fb;
 141         } else {
 142                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 143                 prealloc = true;
 144                 sizes->fb_width = intel_fb->base.width;
 145                 sizes->fb_height = intel_fb->base.height;
 146         }
 147
 148         obj = intel_fb->obj;
 149         size = obj->base.size;
 150
 151         info = framebuffer_alloc(0, &dev->pdev->dev);
 152         if (!info) {
 153                 ret = -ENOMEM;
 154                 goto out_unpin;
 155         }
 156
 157         info->par = helper;
 158
 159         fb = &ifbdev->fb->base;
 160
 161         ifbdev->helper.fb = fb;
 162         ifbdev->helper.fbdev = info;
 163
 164         strcpy(info->fix.id, "inteldrmfb");
 165
 166         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 167         info->fbops = &intelfb_ops;
 168
 169         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 170         if (ret) {
 171                 ret = -ENOMEM;
 172                 goto out_unpin;
 173         }
 174         /* setup aperture base/size for vesafb takeover */
 175         info->apertures = alloc_apertures(1);
 176         if (!info->apertures) {
 177                 ret = -ENOMEM;
 178                 goto out_unpin;
 179         }
 180         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 181         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 182
 183         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 184         info->fix.smem_len = size;
 185
 186         info->screen_base =
 187                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 188                            size);
 189         if (!info->screen_base) {
 190                 ret = -ENOSPC;
 191                 goto out_unpin;
 192         }
 193         info->screen_size = size;
 194
 195         /* This driver doesn't need a VT switch to restore the mode on resume */
 196         info->skip_vt_switch = true;
 197
 198         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 199         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 200
 201         /* If the object is shmemfs backed, it will have given us zeroed pages.
 202          * If the object is stolen however, it will be full of whatever
 203          * garbage was left in there.
 204          */
 205         if (ifbdev->fb->obj->stolen && !prealloc)
 206                 memset_io(info->screen_base, 0, info->screen_size);
 207
 208         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 209
 210         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 211                       fb->width, fb->height,
 212                       i915_gem_obj_ggtt_offset(obj), obj);
 213
 214         mutex_unlock(&dev->struct_mutex);
 215         vga_switcheroo_client_fb_set(dev->pdev, info);
 216         return 0;
 217
 218 out_unpin:
 219         i915_gem_object_ggtt_unpin(obj);
 220         drm_gem_object_unreference(&obj->base);
 221 out_unlock:
 222         mutex_unlock(&dev->struct_mutex);
 223         return ret;
 224 }
 225
 226 /** Sets the color ramps on behalf of RandR */
 227 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 228                                     u16 blue, int regno)
 229 {
 230         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 231
 232         intel_crtc->lut_r[regno] = red >> 8;
 233         intel_crtc->lut_g[regno] = green >> 8;
 234         intel_crtc->lut_b[regno] = blue >> 8;
 235 }
 236
 237 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 238                                     u16 *blue, int regno)
 239 {
 240         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 241
 242         *red = intel_crtc->lut_r[regno] << 8;
 243         *green = intel_crtc->lut_g[regno] << 8;
 244         *blue = intel_crtc->lut_b[regno] << 8;
 245 }
 246
 247 static struct drm_fb_helper_crtc *
 248 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 249 {
 250         int i;
 251
 252         for (i = 0; i < fb_helper->crtc_count; i++)
 253                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 254                         return &fb_helper->crtc_info[i];
 255
 256         return NULL;
 257 }
 258
 259 /*
 260  * Try to read the BIOS display configuration and use it for the initial
 261  * fb configuration.
 262  *
 263  * The BIOS or boot loader will generally create an initial display
 264  * configuration for us that includes some set of active pipes and displays.
 265  * This routine tries to figure out which pipes and connectors are active
 266  * and stuffs them into the crtcs and modes array given to us by the
 267  * drm_fb_helper code.
 268  *
 269  * The overall sequence is:
 270  *   intel_fbdev_init - from driver load
 271  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 272  *     drm_fb_helper_init - build fb helper structs
 273  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 274  *   intel_fbdev_initial_config - apply the config
 275  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 276  *         drm_setup_crtcs - build crtc config for fbdev
 277  *           intel_fb_initial_config - find active connectors etc
 278  *         drm_fb_helper_single_fb_probe - set up fbdev
 279  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 280  *
 281  * Note that we don't make special consideration whether we could actually
 282  * switch to the selected modes without a full modeset. E.g. when the display
 283  * is in VGA mode we need to recalculate watermarks and set a new high-res
 284  * framebuffer anyway.
 285  */
 286 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 287                                     struct drm_fb_helper_crtc **crtcs,
 288                                     struct drm_display_mode **modes,
 289                                     bool *enabled, int width, int height)
 290 {
 291         struct drm_device *dev = fb_helper->dev;
 292         int i, j;
 293         bool *save_enabled;
 294         bool fallback = true;
 295         int num_connectors_enabled = 0;
 296         int num_connectors_detected = 0;
 297
 298         /*
 299          * If the user specified any force options, just bail here
 300          * and use that config.
 301          */
 302         for (i = 0; i < fb_helper->connector_count; i++) {
 303                 struct drm_fb_helper_connector *fb_conn;
 304                 struct drm_connector *connector;
 305
 306                 fb_conn = fb_helper->connector_info[i];
 307                 connector = fb_conn->connector;
 308
 309                 if (!enabled[i])
 310                         continue;
 311
 312                 if (connector->force != DRM_FORCE_UNSPECIFIED)
 313                         return false;
 314         }
 315
 316         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 317                                GFP_KERNEL);
 318         if (!save_enabled)
 319                 return false;
 320
 321         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 322
 323         for (i = 0; i < fb_helper->connector_count; i++) {
 324                 struct drm_fb_helper_connector *fb_conn;
 325                 struct drm_connector *connector;
 326                 struct drm_encoder *encoder;
 327                 struct drm_fb_helper_crtc *new_crtc;
 328
 329                 fb_conn = fb_helper->connector_info[i];
 330                 connector = fb_conn->connector;
 331
 332                 if (connector->status == connector_status_connected)
 333                         num_connectors_detected++;
 334
 335                 if (!enabled[i]) {
 336                         DRM_DEBUG_KMS("connector %d not enabled, skipping\n",
 337                                       connector->base.id);
 338                         continue;
 339                 }
 340
 341                 encoder = connector->encoder;
 342                 if (!encoder || WARN_ON(!encoder->crtc)) {
 343                         DRM_DEBUG_KMS("connector %d has no encoder or crtc, skipping\n",
 344                                       connector->base.id);
 345                         enabled[i] = false;
 346                         continue;
 347                 }
 348
 349                 num_connectors_enabled++;
 350
 351                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 352
 353                 /*
 354                  * Make sure we're not trying to drive multiple connectors
 355                  * with a single CRTC, since our cloning support may not
 356                  * match the BIOS.
 357                  */
 358                 for (j = 0; j < fb_helper->connector_count; j++) {
 359                         if (crtcs[j] == new_crtc) {
 360                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 361                                 fallback = true;
 362                                 goto out;
 363                         }
 364                 }
 365
 366                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
 367                               fb_conn->connector->base.id);
 368
 369                 /* go for command line mode first */
 370                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 371
 372                 /* try for preferred next */
 373                 if (!modes[i]) {
 374                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
 375                                       fb_conn->connector->base.id);
 376                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 377                                                           height);
 378                 }
 379
 380                 /* last resort: use current mode */
 381                 if (!modes[i]) {
 382                         /*
 383                          * IMPORTANT: We want to use the adjusted mode (i.e.
 384                          * after the panel fitter upscaling) as the initial
 385                          * config, not the input mode, which is what crtc->mode
 386                          * usually contains. But since our current fastboot
 387                          * code puts a mode derived from the post-pfit timings
 388                          * into crtc->mode this works out correctly. We don't
 389                          * use hwmode anywhere right now, so use it for this
 390                          * since the fb helper layer wants a pointer to
 391                          * something we own.
 392                          */
 393                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
 394                                                     &to_intel_crtc(encoder->crtc)->config);
 395                         modes[i] = &encoder->crtc->hwmode;
 396                 }
 397                 crtcs[i] = new_crtc;
 398
 399                 DRM_DEBUG_KMS("connector %s on crtc %d: %s\n",
 400                               drm_get_connector_name(connector),
 401                               encoder->crtc->base.id,
 402                               modes[i]->name);
 403
 404                 fallback = false;
 405         }
 406
 407         /*
 408          * If the BIOS didn't enable everything it could, fall back to have the
 409          * same user experiencing of lighting up as much as possible like the
 410          * fbdev helper library.
 411          */
 412         if (num_connectors_enabled != num_connectors_detected &&
 413             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 414                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 415                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 416                               num_connectors_detected);
 417                 fallback = true;
 418         }
 419
 420 out:
 421         if (fallback) {
 422                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 423                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 424                 kfree(save_enabled);
 425                 return false;
 426         }
 427
 428         kfree(save_enabled);
 429         return true;
 430 }
 431
 432 static struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 433         .initial_config = intel_fb_initial_config,
 434         .gamma_set = intel_crtc_fb_gamma_set,
 435         .gamma_get = intel_crtc_fb_gamma_get,
 436         .fb_probe = intelfb_create,
 437 };
 438
 439 static void intel_fbdev_destroy(struct drm_device *dev,
 440                                 struct intel_fbdev *ifbdev)
 441 {
 442         if (ifbdev->helper.fbdev) {
 443                 struct fb_info *info = ifbdev->helper.fbdev;
 444
 445                 unregister_framebuffer(info);
 446                 iounmap(info->screen_base);
 447                 if (info->cmap.len)
 448                         fb_dealloc_cmap(&info->cmap);
 449
 450                 framebuffer_release(info);
 451         }
 452
 453         drm_fb_helper_fini(&ifbdev->helper);
 454
 455         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 456         drm_framebuffer_remove(&ifbdev->fb->base);
 457 }
 458
 459 /*
 460  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 461  * The core display code will have read out the current plane configuration,
 462  * so we use that to figure out if there's an object for us to use as the
 463  * fb, and if so, we re-use it for the fbdev configuration.
 464  *
 465  * Note we only support a single fb shared across pipes for boot (mostly for
 466  * fbcon), so we just find the biggest and use that.
 467  */
 468 static bool intel_fbdev_init_bios(struct drm_device *dev,
 469                                  struct intel_fbdev *ifbdev)
 470 {
 471         struct intel_framebuffer *fb = NULL;
 472         struct drm_crtc *crtc;
 473         struct intel_crtc *intel_crtc;
 474         struct intel_plane_config *plane_config = NULL;
 475         unsigned int max_size = 0;
 476
 477         if (!i915.fastboot)
 478                 return false;
 479
 480         /* Find the largest fb */
 481         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 482                 intel_crtc = to_intel_crtc(crtc);
 483
 484                 if (!intel_crtc->active || !crtc->primary->fb) {
 485                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 486                                       pipe_name(intel_crtc->pipe));
 487                         continue;
 488                 }
 489
 490                 if (intel_crtc->plane_config.size > max_size) {
 491                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 492                                       pipe_name(intel_crtc->pipe));
 493                         plane_config = &intel_crtc->plane_config;
 494                         fb = to_intel_framebuffer(crtc->primary->fb);
 495                         max_size = plane_config->size;
 496                 }
 497         }
 498
 499         if (!fb) {
 500                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 501                 goto out;
 502         }
 503
 504         /* Now make sure all the pipes will fit into it */
 505         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 506                 unsigned int cur_size;
 507
 508                 intel_crtc = to_intel_crtc(crtc);
 509
 510                 if (!intel_crtc->active) {
 511                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 512                                       pipe_name(intel_crtc->pipe));
 513                         continue;
 514                 }
 515
 516                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 517                               pipe_name(intel_crtc->pipe));
 518
 519                 /*
 520                  * See if the plane fb we found above will fit on this
 521                  * pipe.  Note we need to use the selected fb's pitch and bpp
 522                  * rather than the current pipe's, since they differ.
 523                  */
 524                 cur_size = intel_crtc->config.adjusted_mode.crtc_hdisplay;
 525                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 526                 if (fb->base.pitches[0] < cur_size) {
 527                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 528                                       pipe_name(intel_crtc->pipe),
 529                                       cur_size, fb->base.pitches[0]);
 530                         plane_config = NULL;
 531                         fb = NULL;
 532                         break;
 533                 }
 534
 535                 cur_size = intel_crtc->config.adjusted_mode.crtc_vdisplay;
 536                 cur_size = ALIGN(cur_size, plane_config->tiled ? (IS_GEN2(dev) ? 16 : 8) : 1);
 537                 cur_size *= fb->base.pitches[0];
 538                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 539                               pipe_name(intel_crtc->pipe),
 540                               intel_crtc->config.adjusted_mode.crtc_hdisplay,
 541                               intel_crtc->config.adjusted_mode.crtc_vdisplay,
 542                               fb->base.bits_per_pixel,
 543                               cur_size);
 544
 545                 if (cur_size > max_size) {
 546                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 547                                       pipe_name(intel_crtc->pipe),
 548                                       cur_size, max_size);
 549                         plane_config = NULL;
 550                         fb = NULL;
 551                         break;
 552                 }
 553
 554                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 555                               pipe_name(intel_crtc->pipe),
 556                               max_size, cur_size);
 557         }
 558
 559         if (!fb) {
 560                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 561                 goto out;
 562         }
 563
 564         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 565         ifbdev->fb = fb;
 566
 567         drm_framebuffer_reference(&ifbdev->fb->base);
 568
 569         /* Final pass to check if any active pipes don't have fbs */
 570         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 571                 intel_crtc = to_intel_crtc(crtc);
 572
 573                 if (!intel_crtc->active)
 574                         continue;
 575
 576                 WARN(!crtc->primary->fb,
 577                      "re-used BIOS config but lost an fb on crtc %d\n",
 578                      crtc->base.id);
 579         }
 580
 581
 582         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 583         return true;
 584
 585 out:
 586
 587         return false;
 588 }
 589
 590 int intel_fbdev_init(struct drm_device *dev)
 591 {
 592         struct intel_fbdev *ifbdev;
 593         struct drm_i915_private *dev_priv = dev->dev_private;
 594         int ret;
 595
 596         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 597                 return -ENODEV;
 598
 599         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 600         if (ifbdev == NULL)
 601                 return -ENOMEM;
 602
 603         ifbdev->helper.funcs = &intel_fb_helper_funcs;
 604         if (!intel_fbdev_init_bios(dev, ifbdev))
 605                 ifbdev->preferred_bpp = 32;
 606
 607         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 608                                  INTEL_INFO(dev)->num_pipes, 4);
 609         if (ret) {
 610                 kfree(ifbdev);
 611                 return ret;
 612         }
 613
 614         dev_priv->fbdev = ifbdev;
 615         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 616
 617         return 0;
 618 }
 619
 620 void intel_fbdev_initial_config(struct drm_device *dev)
 621 {
 622         struct drm_i915_private *dev_priv = dev->dev_private;
 623         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 624
 625         /* Due to peculiar init order wrt to hpd handling this is separate. */
 626         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 627 }
 628
 629 void intel_fbdev_fini(struct drm_device *dev)
 630 {
 631         struct drm_i915_private *dev_priv = dev->dev_private;
 632         if (!dev_priv->fbdev)
 633                 return;
 634
 635         intel_fbdev_destroy(dev, dev_priv->fbdev);
 636         kfree(dev_priv->fbdev);
 637         dev_priv->fbdev = NULL;
 638 }
 639
 640 void intel_fbdev_set_suspend(struct drm_device *dev, int state)
 641 {
 642         struct drm_i915_private *dev_priv = dev->dev_private;
 643         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 644         struct fb_info *info;
 645
 646         if (!ifbdev)
 647                 return;
 648
 649         info = ifbdev->helper.fbdev;
 650
 651         /* On resume from hibernation: If the object is shmemfs backed, it has
 652          * been restored from swap. If the object is stolen however, it will be
 653          * full of whatever garbage was left in there.
 654          */
 655         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 656                 memset_io(info->screen_base, 0, info->screen_size);
 657
 658         fb_set_suspend(info, state);
 659 }
 660
 661 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 662 {
 663         struct drm_i915_private *dev_priv = dev->dev_private;
 664         if (dev_priv->fbdev)
 665                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 666 }
 667
 668 void intel_fbdev_restore_mode(struct drm_device *dev)
 669 {
 670         int ret;
 671         struct drm_i915_private *dev_priv = dev->dev_private;
 672
 673         if (!dev_priv->fbdev)
 674                 return;
 675
 676         drm_modeset_lock_all(dev);
 677
 678         ret = drm_fb_helper_restore_fbdev_mode(&dev_priv->fbdev->helper);
 679         if (ret)
 680                 DRM_DEBUG("failed to restore crtc mode\n");
 681
 682         drm_modeset_unlock_all(dev);
 683 }