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 int intel_fbdev_set_par(struct fb_info *info)
  47 {
  48         struct drm_fb_helper *fb_helper = info->par;
  49         struct intel_fbdev *ifbdev =
  50                 container_of(fb_helper, struct intel_fbdev, helper);
  51         int ret;
  52
  53         ret = drm_fb_helper_set_par(info);
  54
  55         if (ret == 0) {
  56                 /*
  57                  * FIXME: fbdev presumes that all callbacks also work from
  58                  * atomic contexts and relies on that for emergency oops
  59                  * printing. KMS totally doesn't do that and the locking here is
  60                  * by far not the only place this goes wrong.  Ignore this for
  61                  * now until we solve this for real.
  62                  */
  63                 mutex_lock(&fb_helper->dev->struct_mutex);
  64                 ret = i915_gem_object_set_to_gtt_domain(ifbdev->fb->obj,
  65                                                         true);
  66                 mutex_unlock(&fb_helper->dev->struct_mutex);
  67         }
  68
  69         return ret;
  70 }
  71
  72 static struct fb_ops intelfb_ops = {
  73         .owner = THIS_MODULE,
  74         .fb_check_var = drm_fb_helper_check_var,
  75         .fb_set_par = intel_fbdev_set_par,
  76         .fb_fillrect = cfb_fillrect,
  77         .fb_copyarea = cfb_copyarea,
  78         .fb_imageblit = cfb_imageblit,
  79         .fb_pan_display = drm_fb_helper_pan_display,
  80         .fb_blank = drm_fb_helper_blank,
  81         .fb_setcmap = drm_fb_helper_setcmap,
  82         .fb_debug_enter = drm_fb_helper_debug_enter,
  83         .fb_debug_leave = drm_fb_helper_debug_leave,
  84 };
  85
  86 static int intelfb_alloc(struct drm_fb_helper *helper,
  87                          struct drm_fb_helper_surface_size *sizes)
  88 {
  89         struct intel_fbdev *ifbdev =
  90                 container_of(helper, struct intel_fbdev, helper);
  91         struct drm_framebuffer *fb;
  92         struct drm_device *dev = helper->dev;
  93         struct drm_mode_fb_cmd2 mode_cmd = {};
  94         struct drm_i915_gem_object *obj;
  95         int size, ret;
  96
  97         /* we don't do packed 24bpp */
  98         if (sizes->surface_bpp == 24)
  99                 sizes->surface_bpp = 32;
 100
 101         mode_cmd.width = sizes->surface_width;
 102         mode_cmd.height = sizes->surface_height;
 103
 104         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 105                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 106         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 107                                                           sizes->surface_depth);
 108
 109         size = mode_cmd.pitches[0] * mode_cmd.height;
 110         size = PAGE_ALIGN(size);
 111         obj = i915_gem_object_create_stolen(dev, size);
 112         if (obj == NULL)
 113                 obj = i915_gem_alloc_object(dev, size);
 114         if (!obj) {
 115                 DRM_ERROR("failed to allocate framebuffer\n");
 116                 ret = -ENOMEM;
 117                 goto out;
 118         }
 119
 120         /* Flush everything out, we'll be doing GTT only from now on */
 121         ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
 122         if (ret) {
 123                 DRM_ERROR("failed to pin obj: %d\n", ret);
 124                 goto out_unref;
 125         }
 126
 127         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 128         if (IS_ERR(fb)) {
 129                 ret = PTR_ERR(fb);
 130                 goto out_unpin;
 131         }
 132
 133         ifbdev->fb = to_intel_framebuffer(fb);
 134
 135         return 0;
 136
 137 out_unpin:
 138         i915_gem_object_ggtt_unpin(obj);
 139 out_unref:
 140         drm_gem_object_unreference(&obj->base);
 141 out:
 142         return ret;
 143 }
 144
 145 static int intelfb_create(struct drm_fb_helper *helper,
 146                           struct drm_fb_helper_surface_size *sizes)
 147 {
 148         struct intel_fbdev *ifbdev =
 149                 container_of(helper, struct intel_fbdev, helper);
 150         struct intel_framebuffer *intel_fb = ifbdev->fb;
 151         struct drm_device *dev = helper->dev;
 152         struct drm_i915_private *dev_priv = dev->dev_private;
 153         struct fb_info *info;
 154         struct drm_framebuffer *fb;
 155         struct drm_i915_gem_object *obj;
 156         int size, ret;
 157         bool prealloc = false;
 158
 159         mutex_lock(&dev->struct_mutex);
 160
 161         if (intel_fb &&
 162             (sizes->fb_width > intel_fb->base.width ||
 163              sizes->fb_height > intel_fb->base.height)) {
 164                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 165                               " releasing it\n",
 166                               intel_fb->base.width, intel_fb->base.height,
 167                               sizes->fb_width, sizes->fb_height);
 168                 drm_framebuffer_unreference(&intel_fb->base);
 169                 intel_fb = ifbdev->fb = NULL;
 170         }
 171         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 172                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 173                 ret = intelfb_alloc(helper, sizes);
 174                 if (ret)
 175                         goto out_unlock;
 176                 intel_fb = ifbdev->fb;
 177         } else {
 178                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 179                 prealloc = true;
 180                 sizes->fb_width = intel_fb->base.width;
 181                 sizes->fb_height = intel_fb->base.height;
 182         }
 183
 184         obj = intel_fb->obj;
 185         size = obj->base.size;
 186
 187         info = framebuffer_alloc(0, &dev->pdev->dev);
 188         if (!info) {
 189                 ret = -ENOMEM;
 190                 goto out_unpin;
 191         }
 192
 193         info->par = helper;
 194
 195         fb = &ifbdev->fb->base;
 196
 197         ifbdev->helper.fb = fb;
 198         ifbdev->helper.fbdev = info;
 199
 200         strcpy(info->fix.id, "inteldrmfb");
 201
 202         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 203         info->fbops = &intelfb_ops;
 204
 205         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 206         if (ret) {
 207                 ret = -ENOMEM;
 208                 goto out_unpin;
 209         }
 210         /* setup aperture base/size for vesafb takeover */
 211         info->apertures = alloc_apertures(1);
 212         if (!info->apertures) {
 213                 ret = -ENOMEM;
 214                 goto out_unpin;
 215         }
 216         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 217         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 218
 219         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 220         info->fix.smem_len = size;
 221
 222         info->screen_base =
 223                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 224                            size);
 225         if (!info->screen_base) {
 226                 ret = -ENOSPC;
 227                 goto out_unpin;
 228         }
 229         info->screen_size = size;
 230
 231         /* This driver doesn't need a VT switch to restore the mode on resume */
 232         info->skip_vt_switch = true;
 233
 234         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 235         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 236
 237         /* If the object is shmemfs backed, it will have given us zeroed pages.
 238          * If the object is stolen however, it will be full of whatever
 239          * garbage was left in there.
 240          */
 241         if (ifbdev->fb->obj->stolen && !prealloc)
 242                 memset_io(info->screen_base, 0, info->screen_size);
 243
 244         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 245
 246         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 247                       fb->width, fb->height,
 248                       i915_gem_obj_ggtt_offset(obj), obj);
 249
 250         mutex_unlock(&dev->struct_mutex);
 251         vga_switcheroo_client_fb_set(dev->pdev, info);
 252         return 0;
 253
 254 out_unpin:
 255         i915_gem_object_ggtt_unpin(obj);
 256         drm_gem_object_unreference(&obj->base);
 257 out_unlock:
 258         mutex_unlock(&dev->struct_mutex);
 259         return ret;
 260 }
 261
 262 /** Sets the color ramps on behalf of RandR */
 263 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 264                                     u16 blue, int regno)
 265 {
 266         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 267
 268         intel_crtc->lut_r[regno] = red >> 8;
 269         intel_crtc->lut_g[regno] = green >> 8;
 270         intel_crtc->lut_b[regno] = blue >> 8;
 271 }
 272
 273 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 274                                     u16 *blue, int regno)
 275 {
 276         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 277
 278         *red = intel_crtc->lut_r[regno] << 8;
 279         *green = intel_crtc->lut_g[regno] << 8;
 280         *blue = intel_crtc->lut_b[regno] << 8;
 281 }
 282
 283 static struct drm_fb_helper_crtc *
 284 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 285 {
 286         int i;
 287
 288         for (i = 0; i < fb_helper->crtc_count; i++)
 289                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 290                         return &fb_helper->crtc_info[i];
 291
 292         return NULL;
 293 }
 294
 295 /*
 296  * Try to read the BIOS display configuration and use it for the initial
 297  * fb configuration.
 298  *
 299  * The BIOS or boot loader will generally create an initial display
 300  * configuration for us that includes some set of active pipes and displays.
 301  * This routine tries to figure out which pipes and connectors are active
 302  * and stuffs them into the crtcs and modes array given to us by the
 303  * drm_fb_helper code.
 304  *
 305  * The overall sequence is:
 306  *   intel_fbdev_init - from driver load
 307  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 308  *     drm_fb_helper_init - build fb helper structs
 309  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 310  *   intel_fbdev_initial_config - apply the config
 311  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 312  *         drm_setup_crtcs - build crtc config for fbdev
 313  *           intel_fb_initial_config - find active connectors etc
 314  *         drm_fb_helper_single_fb_probe - set up fbdev
 315  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 316  *
 317  * Note that we don't make special consideration whether we could actually
 318  * switch to the selected modes without a full modeset. E.g. when the display
 319  * is in VGA mode we need to recalculate watermarks and set a new high-res
 320  * framebuffer anyway.
 321  */
 322 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 323                                     struct drm_fb_helper_crtc **crtcs,
 324                                     struct drm_display_mode **modes,
 325                                     bool *enabled, int width, int height)
 326 {
 327         struct drm_device *dev = fb_helper->dev;
 328         int i, j;
 329         bool *save_enabled;
 330         bool fallback = true;
 331         int num_connectors_enabled = 0;
 332         int num_connectors_detected = 0;
 333
 334         /*
 335          * If the user specified any force options, just bail here
 336          * and use that config.
 337          */
 338         for (i = 0; i < fb_helper->connector_count; i++) {
 339                 struct drm_fb_helper_connector *fb_conn;
 340                 struct drm_connector *connector;
 341
 342                 fb_conn = fb_helper->connector_info[i];
 343                 connector = fb_conn->connector;
 344
 345                 if (!enabled[i])
 346                         continue;
 347
 348                 if (connector->force != DRM_FORCE_UNSPECIFIED)
 349                         return false;
 350         }
 351
 352         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 353                                GFP_KERNEL);
 354         if (!save_enabled)
 355                 return false;
 356
 357         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 358
 359         for (i = 0; i < fb_helper->connector_count; i++) {
 360                 struct drm_fb_helper_connector *fb_conn;
 361                 struct drm_connector *connector;
 362                 struct drm_encoder *encoder;
 363                 struct drm_fb_helper_crtc *new_crtc;
 364
 365                 fb_conn = fb_helper->connector_info[i];
 366                 connector = fb_conn->connector;
 367
 368                 if (connector->status == connector_status_connected)
 369                         num_connectors_detected++;
 370
 371                 if (!enabled[i]) {
 372                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 373                                       connector->name);
 374                         continue;
 375                 }
 376
 377                 encoder = connector->encoder;
 378                 if (!encoder || WARN_ON(!encoder->crtc)) {
 379                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 380                                       connector->name);
 381                         enabled[i] = false;
 382                         continue;
 383                 }
 384
 385                 num_connectors_enabled++;
 386
 387                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 388
 389                 /*
 390                  * Make sure we're not trying to drive multiple connectors
 391                  * with a single CRTC, since our cloning support may not
 392                  * match the BIOS.
 393                  */
 394                 for (j = 0; j < fb_helper->connector_count; j++) {
 395                         if (crtcs[j] == new_crtc) {
 396                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 397                                 fallback = true;
 398                                 goto out;
 399                         }
 400                 }
 401
 402                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 403                               connector->name);
 404
 405                 /* go for command line mode first */
 406                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 407
 408                 /* try for preferred next */
 409                 if (!modes[i]) {
 410                         DRM_DEBUG_KMS("looking for preferred mode on connector %s\n",
 411                                       connector->name);
 412                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 413                                                           height);
 414                 }
 415
 416                 /* No preferred mode marked by the EDID? Are there any modes? */
 417                 if (!modes[i] && !list_empty(&connector->modes)) {
 418                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 419                                       connector->name);
 420                         modes[i] = list_first_entry(&connector->modes,
 421                                                     struct drm_display_mode,
 422                                                     head);
 423                 }
 424
 425                 /* last resort: use current mode */
 426                 if (!modes[i]) {
 427                         /*
 428                          * IMPORTANT: We want to use the adjusted mode (i.e.
 429                          * after the panel fitter upscaling) as the initial
 430                          * config, not the input mode, which is what crtc->mode
 431                          * usually contains. But since our current fastboot
 432                          * code puts a mode derived from the post-pfit timings
 433                          * into crtc->mode this works out correctly. We don't
 434                          * use hwmode anywhere right now, so use it for this
 435                          * since the fb helper layer wants a pointer to
 436                          * something we own.
 437                          */
 438                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 439                                       connector->name);
 440                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
 441                                                     &to_intel_crtc(encoder->crtc)->config);
 442                         modes[i] = &encoder->crtc->hwmode;
 443                 }
 444                 crtcs[i] = new_crtc;
 445
 446                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 447                               connector->name,
 448                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
 449                               encoder->crtc->base.id,
 450                               modes[i]->hdisplay, modes[i]->vdisplay,
 451                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 452
 453                 fallback = false;
 454         }
 455
 456         /*
 457          * If the BIOS didn't enable everything it could, fall back to have the
 458          * same user experiencing of lighting up as much as possible like the
 459          * fbdev helper library.
 460          */
 461         if (num_connectors_enabled != num_connectors_detected &&
 462             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 463                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 464                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 465                               num_connectors_detected);
 466                 fallback = true;
 467         }
 468
 469 out:
 470         if (fallback) {
 471                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 472                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 473                 kfree(save_enabled);
 474                 return false;
 475         }
 476
 477         kfree(save_enabled);
 478         return true;
 479 }
 480
 481 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 482         .initial_config = intel_fb_initial_config,
 483         .gamma_set = intel_crtc_fb_gamma_set,
 484         .gamma_get = intel_crtc_fb_gamma_get,
 485         .fb_probe = intelfb_create,
 486 };
 487
 488 static void intel_fbdev_destroy(struct drm_device *dev,
 489                                 struct intel_fbdev *ifbdev)
 490 {
 491         if (ifbdev->helper.fbdev) {
 492                 struct fb_info *info = ifbdev->helper.fbdev;
 493
 494                 unregister_framebuffer(info);
 495                 iounmap(info->screen_base);
 496                 if (info->cmap.len)
 497                         fb_dealloc_cmap(&info->cmap);
 498
 499                 framebuffer_release(info);
 500         }
 501
 502         drm_fb_helper_fini(&ifbdev->helper);
 503
 504         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 505         drm_framebuffer_remove(&ifbdev->fb->base);
 506 }
 507
 508 /*
 509  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 510  * The core display code will have read out the current plane configuration,
 511  * so we use that to figure out if there's an object for us to use as the
 512  * fb, and if so, we re-use it for the fbdev configuration.
 513  *
 514  * Note we only support a single fb shared across pipes for boot (mostly for
 515  * fbcon), so we just find the biggest and use that.
 516  */
 517 static bool intel_fbdev_init_bios(struct drm_device *dev,
 518                                  struct intel_fbdev *ifbdev)
 519 {
 520         struct intel_framebuffer *fb = NULL;
 521         struct drm_crtc *crtc;
 522         struct intel_crtc *intel_crtc;
 523         struct intel_plane_config *plane_config = NULL;
 524         unsigned int max_size = 0;
 525
 526         if (!i915.fastboot)
 527                 return false;
 528
 529         /* Find the largest fb */
 530         for_each_crtc(dev, crtc) {
 531                 intel_crtc = to_intel_crtc(crtc);
 532
 533                 if (!intel_crtc->active || !crtc->primary->fb) {
 534                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 535                                       pipe_name(intel_crtc->pipe));
 536                         continue;
 537                 }
 538
 539                 if (intel_crtc->plane_config.size > max_size) {
 540                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 541                                       pipe_name(intel_crtc->pipe));
 542                         plane_config = &intel_crtc->plane_config;
 543                         fb = to_intel_framebuffer(crtc->primary->fb);
 544                         max_size = plane_config->size;
 545                 }
 546         }
 547
 548         if (!fb) {
 549                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 550                 goto out;
 551         }
 552
 553         /* Now make sure all the pipes will fit into it */
 554         for_each_crtc(dev, crtc) {
 555                 unsigned int cur_size;
 556
 557                 intel_crtc = to_intel_crtc(crtc);
 558
 559                 if (!intel_crtc->active) {
 560                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 561                                       pipe_name(intel_crtc->pipe));
 562                         continue;
 563                 }
 564
 565                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 566                               pipe_name(intel_crtc->pipe));
 567
 568                 /*
 569                  * See if the plane fb we found above will fit on this
 570                  * pipe.  Note we need to use the selected fb's pitch and bpp
 571                  * rather than the current pipe's, since they differ.
 572                  */
 573                 cur_size = intel_crtc->config.adjusted_mode.crtc_hdisplay;
 574                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 575                 if (fb->base.pitches[0] < cur_size) {
 576                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 577                                       pipe_name(intel_crtc->pipe),
 578                                       cur_size, fb->base.pitches[0]);
 579                         plane_config = NULL;
 580                         fb = NULL;
 581                         break;
 582                 }
 583
 584                 cur_size = intel_crtc->config.adjusted_mode.crtc_vdisplay;
 585                 cur_size = ALIGN(cur_size, plane_config->tiled ? (IS_GEN2(dev) ? 16 : 8) : 1);
 586                 cur_size *= fb->base.pitches[0];
 587                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 588                               pipe_name(intel_crtc->pipe),
 589                               intel_crtc->config.adjusted_mode.crtc_hdisplay,
 590                               intel_crtc->config.adjusted_mode.crtc_vdisplay,
 591                               fb->base.bits_per_pixel,
 592                               cur_size);
 593
 594                 if (cur_size > max_size) {
 595                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 596                                       pipe_name(intel_crtc->pipe),
 597                                       cur_size, max_size);
 598                         plane_config = NULL;
 599                         fb = NULL;
 600                         break;
 601                 }
 602
 603                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 604                               pipe_name(intel_crtc->pipe),
 605                               max_size, cur_size);
 606         }
 607
 608         if (!fb) {
 609                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 610                 goto out;
 611         }
 612
 613         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 614         ifbdev->fb = fb;
 615
 616         drm_framebuffer_reference(&ifbdev->fb->base);
 617
 618         /* Final pass to check if any active pipes don't have fbs */
 619         for_each_crtc(dev, crtc) {
 620                 intel_crtc = to_intel_crtc(crtc);
 621
 622                 if (!intel_crtc->active)
 623                         continue;
 624
 625                 WARN(!crtc->primary->fb,
 626                      "re-used BIOS config but lost an fb on crtc %d\n",
 627                      crtc->base.id);
 628         }
 629
 630
 631         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 632         return true;
 633
 634 out:
 635
 636         return false;
 637 }
 638
 639 int intel_fbdev_init(struct drm_device *dev)
 640 {
 641         struct intel_fbdev *ifbdev;
 642         struct drm_i915_private *dev_priv = dev->dev_private;
 643         int ret;
 644
 645         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 646                 return -ENODEV;
 647
 648         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 649         if (ifbdev == NULL)
 650                 return -ENOMEM;
 651
 652         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 653
 654         if (!intel_fbdev_init_bios(dev, ifbdev))
 655                 ifbdev->preferred_bpp = 32;
 656
 657         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 658                                  INTEL_INFO(dev)->num_pipes, 4);
 659         if (ret) {
 660                 kfree(ifbdev);
 661                 return ret;
 662         }
 663
 664         dev_priv->fbdev = ifbdev;
 665         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 666
 667         return 0;
 668 }
 669
 670 void intel_fbdev_initial_config(struct drm_device *dev)
 671 {
 672         struct drm_i915_private *dev_priv = dev->dev_private;
 673         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 674
 675         /* Due to peculiar init order wrt to hpd handling this is separate. */
 676         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 677 }
 678
 679 void intel_fbdev_fini(struct drm_device *dev)
 680 {
 681         struct drm_i915_private *dev_priv = dev->dev_private;
 682         if (!dev_priv->fbdev)
 683                 return;
 684
 685         intel_fbdev_destroy(dev, dev_priv->fbdev);
 686         kfree(dev_priv->fbdev);
 687         dev_priv->fbdev = NULL;
 688 }
 689
 690 void intel_fbdev_set_suspend(struct drm_device *dev, int state)
 691 {
 692         struct drm_i915_private *dev_priv = dev->dev_private;
 693         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 694         struct fb_info *info;
 695
 696         if (!ifbdev)
 697                 return;
 698
 699         info = ifbdev->helper.fbdev;
 700
 701         /* On resume from hibernation: If the object is shmemfs backed, it has
 702          * been restored from swap. If the object is stolen however, it will be
 703          * full of whatever garbage was left in there.
 704          */
 705         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 706                 memset_io(info->screen_base, 0, info->screen_size);
 707
 708         fb_set_suspend(info, state);
 709 }
 710
 711 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 712 {
 713         struct drm_i915_private *dev_priv = dev->dev_private;
 714         if (dev_priv->fbdev)
 715                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 716 }
 717
 718 void intel_fbdev_restore_mode(struct drm_device *dev)
 719 {
 720         int ret;
 721         struct drm_i915_private *dev_priv = dev->dev_private;
 722
 723         if (!dev_priv->fbdev)
 724                 return;
 725
 726         ret = drm_fb_helper_restore_fbdev_mode_unlocked(&dev_priv->fbdev->helper);
 727         if (ret)
 728                 DRM_DEBUG("failed to restore crtc mode\n");
 729 }