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