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/async.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/console.h>
  31 #include <linux/errno.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/tty.h>
  35 #include <linux/sysrq.h>
  36 #include <linux/delay.h>
  37 #include <linux/fb.h>
  38 #include <linux/init.h>
  39 #include <linux/vga_switcheroo.h>
  40
  41 #include <drm/drmP.h>
  42 #include <drm/drm_crtc.h>
  43 #include <drm/drm_fb_helper.h>
  44 #include "intel_drv.h"
  45 #include <drm/i915_drm.h>
  46 #include "i915_drv.h"
  47
  48 static int intel_fbdev_set_par(struct fb_info *info)
  49 {
  50         struct drm_fb_helper *fb_helper = info->par;
  51         struct intel_fbdev *ifbdev =
  52                 container_of(fb_helper, struct intel_fbdev, helper);
  53         int ret;
  54
  55         ret = drm_fb_helper_set_par(info);
  56
  57         if (ret == 0) {
  58                 /*
  59                  * FIXME: fbdev presumes that all callbacks also work from
  60                  * atomic contexts and relies on that for emergency oops
  61                  * printing. KMS totally doesn't do that and the locking here is
  62                  * by far not the only place this goes wrong.  Ignore this for
  63                  * now until we solve this for real.
  64                  */
  65                 mutex_lock(&fb_helper->dev->struct_mutex);
  66                 ret = i915_gem_object_set_to_gtt_domain(ifbdev->fb->obj,
  67                                                         true);
  68                 mutex_unlock(&fb_helper->dev->struct_mutex);
  69         }
  70
  71         return ret;
  72 }
  73
  74 static struct fb_ops intelfb_ops = {
  75         .owner = THIS_MODULE,
  76         .fb_check_var = drm_fb_helper_check_var,
  77         .fb_set_par = intel_fbdev_set_par,
  78         .fb_fillrect = cfb_fillrect,
  79         .fb_copyarea = cfb_copyarea,
  80         .fb_imageblit = cfb_imageblit,
  81         .fb_pan_display = drm_fb_helper_pan_display,
  82         .fb_blank = drm_fb_helper_blank,
  83         .fb_setcmap = drm_fb_helper_setcmap,
  84         .fb_debug_enter = drm_fb_helper_debug_enter,
  85         .fb_debug_leave = drm_fb_helper_debug_leave,
  86 };
  87
  88 static int intelfb_alloc(struct drm_fb_helper *helper,
  89                          struct drm_fb_helper_surface_size *sizes)
  90 {
  91         struct intel_fbdev *ifbdev =
  92                 container_of(helper, struct intel_fbdev, helper);
  93         struct drm_framebuffer *fb;
  94         struct drm_device *dev = helper->dev;
  95         struct drm_mode_fb_cmd2 mode_cmd = {};
  96         struct drm_i915_gem_object *obj;
  97         int size, ret;
  98
  99         /* we don't do packed 24bpp */
 100         if (sizes->surface_bpp == 24)
 101                 sizes->surface_bpp = 32;
 102
 103         mode_cmd.width = sizes->surface_width;
 104         mode_cmd.height = sizes->surface_height;
 105
 106         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 107                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 108         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 109                                                           sizes->surface_depth);
 110
 111         size = mode_cmd.pitches[0] * mode_cmd.height;
 112         size = PAGE_ALIGN(size);
 113         obj = i915_gem_object_create_stolen(dev, size);
 114         if (obj == NULL)
 115                 obj = i915_gem_alloc_object(dev, size);
 116         if (!obj) {
 117                 DRM_ERROR("failed to allocate framebuffer\n");
 118                 ret = -ENOMEM;
 119                 goto out;
 120         }
 121
 122         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 123         if (IS_ERR(fb)) {
 124                 ret = PTR_ERR(fb);
 125                 goto out_unref;
 126         }
 127
 128         /* Flush everything out, we'll be doing GTT only from now on */
 129         ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL);
 130         if (ret) {
 131                 DRM_ERROR("failed to pin obj: %d\n", ret);
 132                 goto out_fb;
 133         }
 134
 135         ifbdev->fb = to_intel_framebuffer(fb);
 136
 137         return 0;
 138
 139 out_fb:
 140         drm_framebuffer_remove(fb);
 141 out_unref:
 142         drm_gem_object_unreference(&obj->base);
 143 out:
 144         return ret;
 145 }
 146
 147 static int intelfb_create(struct drm_fb_helper *helper,
 148                           struct drm_fb_helper_surface_size *sizes)
 149 {
 150         struct intel_fbdev *ifbdev =
 151                 container_of(helper, struct intel_fbdev, helper);
 152         struct intel_framebuffer *intel_fb = ifbdev->fb;
 153         struct drm_device *dev = helper->dev;
 154         struct drm_i915_private *dev_priv = dev->dev_private;
 155         struct fb_info *info;
 156         struct drm_framebuffer *fb;
 157         struct drm_i915_gem_object *obj;
 158         int size, ret;
 159         bool prealloc = false;
 160
 161         mutex_lock(&dev->struct_mutex);
 162
 163         if (intel_fb &&
 164             (sizes->fb_width > intel_fb->base.width ||
 165              sizes->fb_height > intel_fb->base.height)) {
 166                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 167                               " releasing it\n",
 168                               intel_fb->base.width, intel_fb->base.height,
 169                               sizes->fb_width, sizes->fb_height);
 170                 drm_framebuffer_unreference(&intel_fb->base);
 171                 intel_fb = ifbdev->fb = NULL;
 172         }
 173         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 174                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 175                 ret = intelfb_alloc(helper, sizes);
 176                 if (ret)
 177                         goto out_unlock;
 178                 intel_fb = ifbdev->fb;
 179         } else {
 180                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 181                 prealloc = true;
 182                 sizes->fb_width = intel_fb->base.width;
 183                 sizes->fb_height = intel_fb->base.height;
 184         }
 185
 186         obj = intel_fb->obj;
 187         size = obj->base.size;
 188
 189         info = framebuffer_alloc(0, &dev->pdev->dev);
 190         if (!info) {
 191                 ret = -ENOMEM;
 192                 goto out_unpin;
 193         }
 194
 195         info->par = helper;
 196
 197         fb = &ifbdev->fb->base;
 198
 199         ifbdev->helper.fb = fb;
 200         ifbdev->helper.fbdev = info;
 201
 202         strcpy(info->fix.id, "inteldrmfb");
 203
 204         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 205         info->fbops = &intelfb_ops;
 206
 207         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 208         if (ret) {
 209                 ret = -ENOMEM;
 210                 goto out_unpin;
 211         }
 212         /* setup aperture base/size for vesafb takeover */
 213         info->apertures = alloc_apertures(1);
 214         if (!info->apertures) {
 215                 ret = -ENOMEM;
 216                 goto out_unpin;
 217         }
 218         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 219         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 220
 221         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 222         info->fix.smem_len = size;
 223
 224         info->screen_base =
 225                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 226                            size);
 227         if (!info->screen_base) {
 228                 ret = -ENOSPC;
 229                 goto out_unpin;
 230         }
 231         info->screen_size = size;
 232
 233         /* This driver doesn't need a VT switch to restore the mode on resume */
 234         info->skip_vt_switch = true;
 235
 236         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 237         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 238
 239         /* If the object is shmemfs backed, it will have given us zeroed pages.
 240          * If the object is stolen however, it will be full of whatever
 241          * garbage was left in there.
 242          */
 243         if (ifbdev->fb->obj->stolen && !prealloc)
 244                 memset_io(info->screen_base, 0, info->screen_size);
 245
 246         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 247
 248         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 249                       fb->width, fb->height,
 250                       i915_gem_obj_ggtt_offset(obj), obj);
 251
 252         mutex_unlock(&dev->struct_mutex);
 253         vga_switcheroo_client_fb_set(dev->pdev, info);
 254         return 0;
 255
 256 out_unpin:
 257         i915_gem_object_ggtt_unpin(obj);
 258         drm_gem_object_unreference(&obj->base);
 259 out_unlock:
 260         mutex_unlock(&dev->struct_mutex);
 261         return ret;
 262 }
 263
 264 /** Sets the color ramps on behalf of RandR */
 265 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 266                                     u16 blue, int regno)
 267 {
 268         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 269
 270         intel_crtc->lut_r[regno] = red >> 8;
 271         intel_crtc->lut_g[regno] = green >> 8;
 272         intel_crtc->lut_b[regno] = blue >> 8;
 273 }
 274
 275 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 276                                     u16 *blue, int regno)
 277 {
 278         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 279
 280         *red = intel_crtc->lut_r[regno] << 8;
 281         *green = intel_crtc->lut_g[regno] << 8;
 282         *blue = intel_crtc->lut_b[regno] << 8;
 283 }
 284
 285 static struct drm_fb_helper_crtc *
 286 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 287 {
 288         int i;
 289
 290         for (i = 0; i < fb_helper->crtc_count; i++)
 291                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 292                         return &fb_helper->crtc_info[i];
 293
 294         return NULL;
 295 }
 296
 297 /*
 298  * Try to read the BIOS display configuration and use it for the initial
 299  * fb configuration.
 300  *
 301  * The BIOS or boot loader will generally create an initial display
 302  * configuration for us that includes some set of active pipes and displays.
 303  * This routine tries to figure out which pipes and connectors are active
 304  * and stuffs them into the crtcs and modes array given to us by the
 305  * drm_fb_helper code.
 306  *
 307  * The overall sequence is:
 308  *   intel_fbdev_init - from driver load
 309  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 310  *     drm_fb_helper_init - build fb helper structs
 311  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 312  *   intel_fbdev_initial_config - apply the config
 313  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 314  *         drm_setup_crtcs - build crtc config for fbdev
 315  *           intel_fb_initial_config - find active connectors etc
 316  *         drm_fb_helper_single_fb_probe - set up fbdev
 317  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 318  *
 319  * Note that we don't make special consideration whether we could actually
 320  * switch to the selected modes without a full modeset. E.g. when the display
 321  * is in VGA mode we need to recalculate watermarks and set a new high-res
 322  * framebuffer anyway.
 323  */
 324 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 325                                     struct drm_fb_helper_crtc **crtcs,
 326                                     struct drm_display_mode **modes,
 327                                     bool *enabled, int width, int height)
 328 {
 329         struct drm_device *dev = fb_helper->dev;
 330         int i, j;
 331         bool *save_enabled;
 332         bool fallback = true;
 333         int num_connectors_enabled = 0;
 334         int num_connectors_detected = 0;
 335
 336         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 337                                GFP_KERNEL);
 338         if (!save_enabled)
 339                 return false;
 340
 341         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 342
 343         for (i = 0; i < fb_helper->connector_count; i++) {
 344                 struct drm_fb_helper_connector *fb_conn;
 345                 struct drm_connector *connector;
 346                 struct drm_encoder *encoder;
 347                 struct drm_fb_helper_crtc *new_crtc;
 348
 349                 fb_conn = fb_helper->connector_info[i];
 350                 connector = fb_conn->connector;
 351
 352                 if (connector->status == connector_status_connected)
 353                         num_connectors_detected++;
 354
 355                 if (!enabled[i]) {
 356                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 357                                       connector->name);
 358                         continue;
 359                 }
 360
 361                 if (connector->force == DRM_FORCE_OFF) {
 362                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 363                                       connector->name);
 364                         enabled[i] = false;
 365                         continue;
 366                 }
 367
 368                 encoder = connector->encoder;
 369                 if (!encoder || WARN_ON(!encoder->crtc)) {
 370                         if (connector->force > DRM_FORCE_OFF)
 371                                 goto bail;
 372
 373                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 374                                       connector->name);
 375                         enabled[i] = false;
 376                         continue;
 377                 }
 378
 379                 num_connectors_enabled++;
 380
 381                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 382
 383                 /*
 384                  * Make sure we're not trying to drive multiple connectors
 385                  * with a single CRTC, since our cloning support may not
 386                  * match the BIOS.
 387                  */
 388                 for (j = 0; j < fb_helper->connector_count; j++) {
 389                         if (crtcs[j] == new_crtc) {
 390                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 391                                 goto bail;
 392                         }
 393                 }
 394
 395                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 396                               connector->name);
 397
 398                 /* go for command line mode first */
 399                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 400
 401                 /* try for preferred next */
 402                 if (!modes[i]) {
 403                         DRM_DEBUG_KMS("looking for preferred mode on connector %s\n",
 404                                       connector->name);
 405                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 406                                                           height);
 407                 }
 408
 409                 /* No preferred mode marked by the EDID? Are there any modes? */
 410                 if (!modes[i] && !list_empty(&connector->modes)) {
 411                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 412                                       connector->name);
 413                         modes[i] = list_first_entry(&connector->modes,
 414                                                     struct drm_display_mode,
 415                                                     head);
 416                 }
 417
 418                 /* last resort: use current mode */
 419                 if (!modes[i]) {
 420                         /*
 421                          * IMPORTANT: We want to use the adjusted mode (i.e.
 422                          * after the panel fitter upscaling) as the initial
 423                          * config, not the input mode, which is what crtc->mode
 424                          * usually contains. But since our current fastboot
 425                          * code puts a mode derived from the post-pfit timings
 426                          * into crtc->mode this works out correctly. We don't
 427                          * use hwmode anywhere right now, so use it for this
 428                          * since the fb helper layer wants a pointer to
 429                          * something we own.
 430                          */
 431                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 432                                       connector->name);
 433                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
 434                                                     &to_intel_crtc(encoder->crtc)->config);
 435                         modes[i] = &encoder->crtc->hwmode;
 436                 }
 437                 crtcs[i] = new_crtc;
 438
 439                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 440                               connector->name,
 441                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
 442                               encoder->crtc->base.id,
 443                               modes[i]->hdisplay, modes[i]->vdisplay,
 444                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 445
 446                 fallback = false;
 447         }
 448
 449         /*
 450          * If the BIOS didn't enable everything it could, fall back to have the
 451          * same user experiencing of lighting up as much as possible like the
 452          * fbdev helper library.
 453          */
 454         if (num_connectors_enabled != num_connectors_detected &&
 455             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 456                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 457                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 458                               num_connectors_detected);
 459                 fallback = true;
 460         }
 461
 462         if (fallback) {
 463 bail:
 464                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 465                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 466                 kfree(save_enabled);
 467                 return false;
 468         }
 469
 470         kfree(save_enabled);
 471         return true;
 472 }
 473
 474 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 475         .initial_config = intel_fb_initial_config,
 476         .gamma_set = intel_crtc_fb_gamma_set,
 477         .gamma_get = intel_crtc_fb_gamma_get,
 478         .fb_probe = intelfb_create,
 479 };
 480
 481 static void intel_fbdev_destroy(struct drm_device *dev,
 482                                 struct intel_fbdev *ifbdev)
 483 {
 484         if (ifbdev->helper.fbdev) {
 485                 struct fb_info *info = ifbdev->helper.fbdev;
 486
 487                 unregister_framebuffer(info);
 488                 iounmap(info->screen_base);
 489                 if (info->cmap.len)
 490                         fb_dealloc_cmap(&info->cmap);
 491
 492                 framebuffer_release(info);
 493         }
 494
 495         drm_fb_helper_fini(&ifbdev->helper);
 496
 497         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 498         drm_framebuffer_remove(&ifbdev->fb->base);
 499 }
 500
 501 /*
 502  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 503  * The core display code will have read out the current plane configuration,
 504  * so we use that to figure out if there's an object for us to use as the
 505  * fb, and if so, we re-use it for the fbdev configuration.
 506  *
 507  * Note we only support a single fb shared across pipes for boot (mostly for
 508  * fbcon), so we just find the biggest and use that.
 509  */
 510 static bool intel_fbdev_init_bios(struct drm_device *dev,
 511                                  struct intel_fbdev *ifbdev)
 512 {
 513         struct intel_framebuffer *fb = NULL;
 514         struct drm_crtc *crtc;
 515         struct intel_crtc *intel_crtc;
 516         struct intel_plane_config *plane_config = NULL;
 517         unsigned int max_size = 0;
 518
 519         if (!i915.fastboot)
 520                 return false;
 521
 522         /* Find the largest fb */
 523         for_each_crtc(dev, crtc) {
 524                 intel_crtc = to_intel_crtc(crtc);
 525
 526                 if (!intel_crtc->active || !crtc->primary->fb) {
 527                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 528                                       pipe_name(intel_crtc->pipe));
 529                         continue;
 530                 }
 531
 532                 if (intel_crtc->plane_config.size > max_size) {
 533                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 534                                       pipe_name(intel_crtc->pipe));
 535                         plane_config = &intel_crtc->plane_config;
 536                         fb = to_intel_framebuffer(crtc->primary->fb);
 537                         max_size = plane_config->size;
 538                 }
 539         }
 540
 541         if (!fb) {
 542                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 543                 goto out;
 544         }
 545
 546         /* Now make sure all the pipes will fit into it */
 547         for_each_crtc(dev, crtc) {
 548                 unsigned int cur_size;
 549
 550                 intel_crtc = to_intel_crtc(crtc);
 551
 552                 if (!intel_crtc->active) {
 553                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 554                                       pipe_name(intel_crtc->pipe));
 555                         continue;
 556                 }
 557
 558                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 559                               pipe_name(intel_crtc->pipe));
 560
 561                 /*
 562                  * See if the plane fb we found above will fit on this
 563                  * pipe.  Note we need to use the selected fb's pitch and bpp
 564                  * rather than the current pipe's, since they differ.
 565                  */
 566                 cur_size = intel_crtc->config.adjusted_mode.crtc_hdisplay;
 567                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 568                 if (fb->base.pitches[0] < cur_size) {
 569                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 570                                       pipe_name(intel_crtc->pipe),
 571                                       cur_size, fb->base.pitches[0]);
 572                         plane_config = NULL;
 573                         fb = NULL;
 574                         break;
 575                 }
 576
 577                 cur_size = intel_crtc->config.adjusted_mode.crtc_vdisplay;
 578                 cur_size = ALIGN(cur_size, plane_config->tiled ? (IS_GEN2(dev) ? 16 : 8) : 1);
 579                 cur_size *= fb->base.pitches[0];
 580                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 581                               pipe_name(intel_crtc->pipe),
 582                               intel_crtc->config.adjusted_mode.crtc_hdisplay,
 583                               intel_crtc->config.adjusted_mode.crtc_vdisplay,
 584                               fb->base.bits_per_pixel,
 585                               cur_size);
 586
 587                 if (cur_size > max_size) {
 588                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 589                                       pipe_name(intel_crtc->pipe),
 590                                       cur_size, max_size);
 591                         plane_config = NULL;
 592                         fb = NULL;
 593                         break;
 594                 }
 595
 596                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 597                               pipe_name(intel_crtc->pipe),
 598                               max_size, cur_size);
 599         }
 600
 601         if (!fb) {
 602                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 603                 goto out;
 604         }
 605
 606         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 607         ifbdev->fb = fb;
 608
 609         drm_framebuffer_reference(&ifbdev->fb->base);
 610
 611         /* Final pass to check if any active pipes don't have fbs */
 612         for_each_crtc(dev, crtc) {
 613                 intel_crtc = to_intel_crtc(crtc);
 614
 615                 if (!intel_crtc->active)
 616                         continue;
 617
 618                 WARN(!crtc->primary->fb,
 619                      "re-used BIOS config but lost an fb on crtc %d\n",
 620                      crtc->base.id);
 621         }
 622
 623
 624         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 625         return true;
 626
 627 out:
 628
 629         return false;
 630 }
 631
 632 static void intel_fbdev_suspend_worker(struct work_struct *work)
 633 {
 634         intel_fbdev_set_suspend(container_of(work,
 635                                              struct drm_i915_private,
 636                                              fbdev_suspend_work)->dev,
 637                                 FBINFO_STATE_RUNNING,
 638                                 true);
 639 }
 640
 641 int intel_fbdev_init(struct drm_device *dev)
 642 {
 643         struct intel_fbdev *ifbdev;
 644         struct drm_i915_private *dev_priv = dev->dev_private;
 645         int ret;
 646
 647         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 648                 return -ENODEV;
 649
 650         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 651         if (ifbdev == NULL)
 652                 return -ENOMEM;
 653
 654         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 655
 656         if (!intel_fbdev_init_bios(dev, ifbdev))
 657                 ifbdev->preferred_bpp = 32;
 658
 659         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 660                                  INTEL_INFO(dev)->num_pipes, 4);
 661         if (ret) {
 662                 kfree(ifbdev);
 663                 return ret;
 664         }
 665
 666         dev_priv->fbdev = ifbdev;
 667         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 668
 669         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 670
 671         return 0;
 672 }
 673
 674 void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 675 {
 676         struct drm_i915_private *dev_priv = data;
 677         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 678
 679         /* Due to peculiar init order wrt to hpd handling this is separate. */
 680         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 681 }
 682
 683 void intel_fbdev_fini(struct drm_device *dev)
 684 {
 685         struct drm_i915_private *dev_priv = dev->dev_private;
 686         if (!dev_priv->fbdev)
 687                 return;
 688
 689         flush_work(&dev_priv->fbdev_suspend_work);
 690
 691         async_synchronize_full();
 692         intel_fbdev_destroy(dev, dev_priv->fbdev);
 693         kfree(dev_priv->fbdev);
 694         dev_priv->fbdev = NULL;
 695 }
 696
 697 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 698 {
 699         struct drm_i915_private *dev_priv = dev->dev_private;
 700         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 701         struct fb_info *info;
 702
 703         if (!ifbdev)
 704                 return;
 705
 706         info = ifbdev->helper.fbdev;
 707
 708         if (synchronous) {
 709                 /* Flush any pending work to turn the console on, and then
 710                  * wait to turn it off. It must be synchronous as we are
 711                  * about to suspend or unload the driver.
 712                  *
 713                  * Note that from within the work-handler, we cannot flush
 714                  * ourselves, so only flush outstanding work upon suspend!
 715                  */
 716                 if (state != FBINFO_STATE_RUNNING)
 717                         flush_work(&dev_priv->fbdev_suspend_work);
 718                 console_lock();
 719         } else {
 720                 /*
 721                  * The console lock can be pretty contented on resume due
 722                  * to all the printk activity.  Try to keep it out of the hot
 723                  * path of resume if possible.
 724                  */
 725                 WARN_ON(state != FBINFO_STATE_RUNNING);
 726                 if (!console_trylock()) {
 727                         /* Don't block our own workqueue as this can
 728                          * be run in parallel with other i915.ko tasks.
 729                          */
 730                         schedule_work(&dev_priv->fbdev_suspend_work);
 731                         return;
 732                 }
 733         }
 734
 735         /* On resume from hibernation: If the object is shmemfs backed, it has
 736          * been restored from swap. If the object is stolen however, it will be
 737          * full of whatever garbage was left in there.
 738          */
 739         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 740                 memset_io(info->screen_base, 0, info->screen_size);
 741
 742         fb_set_suspend(info, state);
 743         console_unlock();
 744 }
 745
 746 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 747 {
 748         struct drm_i915_private *dev_priv = dev->dev_private;
 749         if (dev_priv->fbdev)
 750                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 751 }
 752
 753 void intel_fbdev_restore_mode(struct drm_device *dev)
 754 {
 755         int ret;
 756         struct drm_i915_private *dev_priv = dev->dev_private;
 757
 758         if (!dev_priv->fbdev)
 759                 return;
 760
 761         ret = drm_fb_helper_restore_fbdev_mode_unlocked(&dev_priv->fbdev->helper);
 762         if (ret)
 763                 DRM_DEBUG("failed to restore crtc mode\n");
 764 }