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 int intel_fbdev_blank(int blank, struct fb_info *info)
  75 {
  76         struct drm_fb_helper *fb_helper = info->par;
  77         struct intel_fbdev *ifbdev =
  78                 container_of(fb_helper, struct intel_fbdev, helper);
  79         int ret;
  80
  81         ret = drm_fb_helper_blank(blank, info);
  82
  83         if (ret == 0) {
  84                 /*
  85                  * FIXME: fbdev presumes that all callbacks also work from
  86                  * atomic contexts and relies on that for emergency oops
  87                  * printing. KMS totally doesn't do that and the locking here is
  88                  * by far not the only place this goes wrong.  Ignore this for
  89                  * now until we solve this for real.
  90                  */
  91                 mutex_lock(&fb_helper->dev->struct_mutex);
  92                 intel_fb_obj_invalidate(ifbdev->fb->obj, NULL, ORIGIN_GTT);
  93                 mutex_unlock(&fb_helper->dev->struct_mutex);
  94         }
  95
  96         return ret;
  97 }
  98
  99 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 100                                    struct fb_info *info)
 101 {
 102         struct drm_fb_helper *fb_helper = info->par;
 103         struct intel_fbdev *ifbdev =
 104                 container_of(fb_helper, struct intel_fbdev, helper);
 105
 106         int ret;
 107         ret = drm_fb_helper_pan_display(var, info);
 108
 109         if (ret == 0) {
 110                 /*
 111                  * FIXME: fbdev presumes that all callbacks also work from
 112                  * atomic contexts and relies on that for emergency oops
 113                  * printing. KMS totally doesn't do that and the locking here is
 114                  * by far not the only place this goes wrong.  Ignore this for
 115                  * now until we solve this for real.
 116                  */
 117                 mutex_lock(&fb_helper->dev->struct_mutex);
 118                 intel_fb_obj_invalidate(ifbdev->fb->obj, NULL, ORIGIN_GTT);
 119                 mutex_unlock(&fb_helper->dev->struct_mutex);
 120         }
 121
 122         return ret;
 123 }
 124
 125 static struct fb_ops intelfb_ops = {
 126         .owner = THIS_MODULE,
 127         .fb_check_var = drm_fb_helper_check_var,
 128         .fb_set_par = intel_fbdev_set_par,
 129         .fb_fillrect = cfb_fillrect,
 130         .fb_copyarea = cfb_copyarea,
 131         .fb_imageblit = cfb_imageblit,
 132         .fb_pan_display = intel_fbdev_pan_display,
 133         .fb_blank = intel_fbdev_blank,
 134         .fb_setcmap = drm_fb_helper_setcmap,
 135         .fb_debug_enter = drm_fb_helper_debug_enter,
 136         .fb_debug_leave = drm_fb_helper_debug_leave,
 137 };
 138
 139 static int intelfb_alloc(struct drm_fb_helper *helper,
 140                          struct drm_fb_helper_surface_size *sizes)
 141 {
 142         struct intel_fbdev *ifbdev =
 143                 container_of(helper, struct intel_fbdev, helper);
 144         struct drm_framebuffer *fb;
 145         struct drm_device *dev = helper->dev;
 146         struct drm_mode_fb_cmd2 mode_cmd = {};
 147         struct drm_i915_gem_object *obj;
 148         int size, ret;
 149
 150         /* we don't do packed 24bpp */
 151         if (sizes->surface_bpp == 24)
 152                 sizes->surface_bpp = 32;
 153
 154         mode_cmd.width = sizes->surface_width;
 155         mode_cmd.height = sizes->surface_height;
 156
 157         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 158                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 159         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 160                                                           sizes->surface_depth);
 161
 162         size = mode_cmd.pitches[0] * mode_cmd.height;
 163         size = PAGE_ALIGN(size);
 164         obj = i915_gem_object_create_stolen(dev, size);
 165         if (obj == NULL)
 166                 obj = i915_gem_alloc_object(dev, size);
 167         if (!obj) {
 168                 DRM_ERROR("failed to allocate framebuffer\n");
 169                 ret = -ENOMEM;
 170                 goto out;
 171         }
 172
 173         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 174         if (IS_ERR(fb)) {
 175                 ret = PTR_ERR(fb);
 176                 goto out_unref;
 177         }
 178
 179         /* Flush everything out, we'll be doing GTT only from now on */
 180         ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL, NULL);
 181         if (ret) {
 182                 DRM_ERROR("failed to pin obj: %d\n", ret);
 183                 goto out_fb;
 184         }
 185
 186         ifbdev->fb = to_intel_framebuffer(fb);
 187
 188         return 0;
 189
 190 out_fb:
 191         drm_framebuffer_remove(fb);
 192 out_unref:
 193         drm_gem_object_unreference(&obj->base);
 194 out:
 195         return ret;
 196 }
 197
 198 static int intelfb_create(struct drm_fb_helper *helper,
 199                           struct drm_fb_helper_surface_size *sizes)
 200 {
 201         struct intel_fbdev *ifbdev =
 202                 container_of(helper, struct intel_fbdev, helper);
 203         struct intel_framebuffer *intel_fb = ifbdev->fb;
 204         struct drm_device *dev = helper->dev;
 205         struct drm_i915_private *dev_priv = dev->dev_private;
 206         struct fb_info *info;
 207         struct drm_framebuffer *fb;
 208         struct drm_i915_gem_object *obj;
 209         int size, ret;
 210         bool prealloc = false;
 211
 212         mutex_lock(&dev->struct_mutex);
 213
 214         if (intel_fb &&
 215             (sizes->fb_width > intel_fb->base.width ||
 216              sizes->fb_height > intel_fb->base.height)) {
 217                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 218                               " releasing it\n",
 219                               intel_fb->base.width, intel_fb->base.height,
 220                               sizes->fb_width, sizes->fb_height);
 221                 drm_framebuffer_unreference(&intel_fb->base);
 222                 intel_fb = ifbdev->fb = NULL;
 223         }
 224         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 225                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 226                 ret = intelfb_alloc(helper, sizes);
 227                 if (ret)
 228                         goto out_unlock;
 229                 intel_fb = ifbdev->fb;
 230         } else {
 231                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 232                 prealloc = true;
 233                 sizes->fb_width = intel_fb->base.width;
 234                 sizes->fb_height = intel_fb->base.height;
 235         }
 236
 237         obj = intel_fb->obj;
 238         size = obj->base.size;
 239
 240         info = framebuffer_alloc(0, &dev->pdev->dev);
 241         if (!info) {
 242                 ret = -ENOMEM;
 243                 goto out_unpin;
 244         }
 245
 246         info->par = helper;
 247
 248         fb = &ifbdev->fb->base;
 249
 250         ifbdev->helper.fb = fb;
 251         ifbdev->helper.fbdev = info;
 252
 253         strcpy(info->fix.id, "inteldrmfb");
 254
 255         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 256         info->fbops = &intelfb_ops;
 257
 258         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 259         if (ret) {
 260                 ret = -ENOMEM;
 261                 goto out_unpin;
 262         }
 263         /* setup aperture base/size for vesafb takeover */
 264         info->apertures = alloc_apertures(1);
 265         if (!info->apertures) {
 266                 ret = -ENOMEM;
 267                 goto out_unpin;
 268         }
 269         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 270         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 271
 272         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 273         info->fix.smem_len = size;
 274
 275         info->screen_base =
 276                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 277                            size);
 278         if (!info->screen_base) {
 279                 ret = -ENOSPC;
 280                 goto out_unpin;
 281         }
 282         info->screen_size = size;
 283
 284         /* This driver doesn't need a VT switch to restore the mode on resume */
 285         info->skip_vt_switch = true;
 286
 287         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 288         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 289
 290         /* If the object is shmemfs backed, it will have given us zeroed pages.
 291          * If the object is stolen however, it will be full of whatever
 292          * garbage was left in there.
 293          */
 294         if (ifbdev->fb->obj->stolen && !prealloc)
 295                 memset_io(info->screen_base, 0, info->screen_size);
 296
 297         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 298
 299         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 300                       fb->width, fb->height,
 301                       i915_gem_obj_ggtt_offset(obj), obj);
 302
 303         mutex_unlock(&dev->struct_mutex);
 304         vga_switcheroo_client_fb_set(dev->pdev, info);
 305         return 0;
 306
 307 out_unpin:
 308         i915_gem_object_ggtt_unpin(obj);
 309         drm_gem_object_unreference(&obj->base);
 310 out_unlock:
 311         mutex_unlock(&dev->struct_mutex);
 312         return ret;
 313 }
 314
 315 /** Sets the color ramps on behalf of RandR */
 316 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 317                                     u16 blue, int regno)
 318 {
 319         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 320
 321         intel_crtc->lut_r[regno] = red >> 8;
 322         intel_crtc->lut_g[regno] = green >> 8;
 323         intel_crtc->lut_b[regno] = blue >> 8;
 324 }
 325
 326 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 327                                     u16 *blue, int regno)
 328 {
 329         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 330
 331         *red = intel_crtc->lut_r[regno] << 8;
 332         *green = intel_crtc->lut_g[regno] << 8;
 333         *blue = intel_crtc->lut_b[regno] << 8;
 334 }
 335
 336 static struct drm_fb_helper_crtc *
 337 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 338 {
 339         int i;
 340
 341         for (i = 0; i < fb_helper->crtc_count; i++)
 342                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 343                         return &fb_helper->crtc_info[i];
 344
 345         return NULL;
 346 }
 347
 348 /*
 349  * Try to read the BIOS display configuration and use it for the initial
 350  * fb configuration.
 351  *
 352  * The BIOS or boot loader will generally create an initial display
 353  * configuration for us that includes some set of active pipes and displays.
 354  * This routine tries to figure out which pipes and connectors are active
 355  * and stuffs them into the crtcs and modes array given to us by the
 356  * drm_fb_helper code.
 357  *
 358  * The overall sequence is:
 359  *   intel_fbdev_init - from driver load
 360  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 361  *     drm_fb_helper_init - build fb helper structs
 362  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 363  *   intel_fbdev_initial_config - apply the config
 364  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 365  *         drm_setup_crtcs - build crtc config for fbdev
 366  *           intel_fb_initial_config - find active connectors etc
 367  *         drm_fb_helper_single_fb_probe - set up fbdev
 368  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 369  *
 370  * Note that we don't make special consideration whether we could actually
 371  * switch to the selected modes without a full modeset. E.g. when the display
 372  * is in VGA mode we need to recalculate watermarks and set a new high-res
 373  * framebuffer anyway.
 374  */
 375 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 376                                     struct drm_fb_helper_crtc **crtcs,
 377                                     struct drm_display_mode **modes,
 378                                     struct drm_fb_offset *offsets,
 379                                     bool *enabled, int width, int height)
 380 {
 381         struct drm_device *dev = fb_helper->dev;
 382         int i, j;
 383         bool *save_enabled;
 384         bool fallback = true;
 385         int num_connectors_enabled = 0;
 386         int num_connectors_detected = 0;
 387         uint64_t conn_configured = 0, mask;
 388         int pass = 0;
 389
 390         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 391                                GFP_KERNEL);
 392         if (!save_enabled)
 393                 return false;
 394
 395         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 396         mask = (1 << fb_helper->connector_count) - 1;
 397 retry:
 398         for (i = 0; i < fb_helper->connector_count; i++) {
 399                 struct drm_fb_helper_connector *fb_conn;
 400                 struct drm_connector *connector;
 401                 struct drm_encoder *encoder;
 402                 struct drm_fb_helper_crtc *new_crtc;
 403
 404                 fb_conn = fb_helper->connector_info[i];
 405                 connector = fb_conn->connector;
 406
 407                 if (conn_configured & (1 << i))
 408                         continue;
 409
 410                 if (pass == 0 && !connector->has_tile)
 411                         continue;
 412
 413                 if (connector->status == connector_status_connected)
 414                         num_connectors_detected++;
 415
 416                 if (!enabled[i]) {
 417                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 418                                       connector->name);
 419                         conn_configured |= (1 << i);
 420                         continue;
 421                 }
 422
 423                 if (connector->force == DRM_FORCE_OFF) {
 424                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 425                                       connector->name);
 426                         enabled[i] = false;
 427                         continue;
 428                 }
 429
 430                 encoder = connector->encoder;
 431                 if (!encoder || WARN_ON(!encoder->crtc)) {
 432                         if (connector->force > DRM_FORCE_OFF)
 433                                 goto bail;
 434
 435                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 436                                       connector->name);
 437                         enabled[i] = false;
 438                         conn_configured |= (1 << i);
 439                         continue;
 440                 }
 441
 442                 num_connectors_enabled++;
 443
 444                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 445
 446                 /*
 447                  * Make sure we're not trying to drive multiple connectors
 448                  * with a single CRTC, since our cloning support may not
 449                  * match the BIOS.
 450                  */
 451                 for (j = 0; j < fb_helper->connector_count; j++) {
 452                         if (crtcs[j] == new_crtc) {
 453                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 454                                 goto bail;
 455                         }
 456                 }
 457
 458                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 459                               connector->name);
 460
 461                 /* go for command line mode first */
 462                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 463
 464                 /* try for preferred next */
 465                 if (!modes[i]) {
 466                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 467                                       connector->name, connector->has_tile);
 468                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 469                                                           height);
 470                 }
 471
 472                 /* No preferred mode marked by the EDID? Are there any modes? */
 473                 if (!modes[i] && !list_empty(&connector->modes)) {
 474                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 475                                       connector->name);
 476                         modes[i] = list_first_entry(&connector->modes,
 477                                                     struct drm_display_mode,
 478                                                     head);
 479                 }
 480
 481                 /* last resort: use current mode */
 482                 if (!modes[i]) {
 483                         /*
 484                          * IMPORTANT: We want to use the adjusted mode (i.e.
 485                          * after the panel fitter upscaling) as the initial
 486                          * config, not the input mode, which is what crtc->mode
 487                          * usually contains. But since our current fastboot
 488                          * code puts a mode derived from the post-pfit timings
 489                          * into crtc->mode this works out correctly. We don't
 490                          * use hwmode anywhere right now, so use it for this
 491                          * since the fb helper layer wants a pointer to
 492                          * something we own.
 493                          */
 494                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 495                                       connector->name);
 496                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
 497                                                     to_intel_crtc(encoder->crtc)->config);
 498                         modes[i] = &encoder->crtc->hwmode;
 499                 }
 500                 crtcs[i] = new_crtc;
 501
 502                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 503                               connector->name,
 504                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
 505                               encoder->crtc->base.id,
 506                               modes[i]->hdisplay, modes[i]->vdisplay,
 507                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 508
 509                 fallback = false;
 510                 conn_configured |= (1 << i);
 511         }
 512
 513         if ((conn_configured & mask) != mask) {
 514                 pass++;
 515                 goto retry;
 516         }
 517
 518         /*
 519          * If the BIOS didn't enable everything it could, fall back to have the
 520          * same user experiencing of lighting up as much as possible like the
 521          * fbdev helper library.
 522          */
 523         if (num_connectors_enabled != num_connectors_detected &&
 524             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 525                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 526                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 527                               num_connectors_detected);
 528                 fallback = true;
 529         }
 530
 531         if (fallback) {
 532 bail:
 533                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 534                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 535                 kfree(save_enabled);
 536                 return false;
 537         }
 538
 539         kfree(save_enabled);
 540         return true;
 541 }
 542
 543 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 544         .initial_config = intel_fb_initial_config,
 545         .gamma_set = intel_crtc_fb_gamma_set,
 546         .gamma_get = intel_crtc_fb_gamma_get,
 547         .fb_probe = intelfb_create,
 548 };
 549
 550 static void intel_fbdev_destroy(struct drm_device *dev,
 551                                 struct intel_fbdev *ifbdev)
 552 {
 553         if (ifbdev->helper.fbdev) {
 554                 struct fb_info *info = ifbdev->helper.fbdev;
 555
 556                 unregister_framebuffer(info);
 557                 iounmap(info->screen_base);
 558                 if (info->cmap.len)
 559                         fb_dealloc_cmap(&info->cmap);
 560
 561                 framebuffer_release(info);
 562         }
 563
 564         drm_fb_helper_fini(&ifbdev->helper);
 565
 566         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 567         drm_framebuffer_remove(&ifbdev->fb->base);
 568 }
 569
 570 /*
 571  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 572  * The core display code will have read out the current plane configuration,
 573  * so we use that to figure out if there's an object for us to use as the
 574  * fb, and if so, we re-use it for the fbdev configuration.
 575  *
 576  * Note we only support a single fb shared across pipes for boot (mostly for
 577  * fbcon), so we just find the biggest and use that.
 578  */
 579 static bool intel_fbdev_init_bios(struct drm_device *dev,
 580                                  struct intel_fbdev *ifbdev)
 581 {
 582         struct intel_framebuffer *fb = NULL;
 583         struct drm_crtc *crtc;
 584         struct intel_crtc *intel_crtc;
 585         struct intel_initial_plane_config *plane_config = NULL;
 586         unsigned int max_size = 0;
 587
 588         if (!i915.fastboot)
 589                 return false;
 590
 591         /* Find the largest fb */
 592         for_each_crtc(dev, crtc) {
 593                 intel_crtc = to_intel_crtc(crtc);
 594
 595                 if (!intel_crtc->active || !crtc->primary->fb) {
 596                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 597                                       pipe_name(intel_crtc->pipe));
 598                         continue;
 599                 }
 600
 601                 if (intel_crtc->plane_config.size > max_size) {
 602                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 603                                       pipe_name(intel_crtc->pipe));
 604                         plane_config = &intel_crtc->plane_config;
 605                         fb = to_intel_framebuffer(crtc->primary->fb);
 606                         max_size = plane_config->size;
 607                 }
 608         }
 609
 610         if (!fb) {
 611                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 612                 goto out;
 613         }
 614
 615         /* Now make sure all the pipes will fit into it */
 616         for_each_crtc(dev, crtc) {
 617                 unsigned int cur_size;
 618
 619                 intel_crtc = to_intel_crtc(crtc);
 620
 621                 if (!intel_crtc->active) {
 622                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 623                                       pipe_name(intel_crtc->pipe));
 624                         continue;
 625                 }
 626
 627                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 628                               pipe_name(intel_crtc->pipe));
 629
 630                 /*
 631                  * See if the plane fb we found above will fit on this
 632                  * pipe.  Note we need to use the selected fb's pitch and bpp
 633                  * rather than the current pipe's, since they differ.
 634                  */
 635                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 636                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 637                 if (fb->base.pitches[0] < cur_size) {
 638                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 639                                       pipe_name(intel_crtc->pipe),
 640                                       cur_size, fb->base.pitches[0]);
 641                         plane_config = NULL;
 642                         fb = NULL;
 643                         break;
 644                 }
 645
 646                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 647                 cur_size = intel_fb_align_height(dev, cur_size,
 648                                                  fb->base.pixel_format,
 649                                                  fb->base.modifier[0]);
 650                 cur_size *= fb->base.pitches[0];
 651                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 652                               pipe_name(intel_crtc->pipe),
 653                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 654                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 655                               fb->base.bits_per_pixel,
 656                               cur_size);
 657
 658                 if (cur_size > max_size) {
 659                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 660                                       pipe_name(intel_crtc->pipe),
 661                                       cur_size, max_size);
 662                         plane_config = NULL;
 663                         fb = NULL;
 664                         break;
 665                 }
 666
 667                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 668                               pipe_name(intel_crtc->pipe),
 669                               max_size, cur_size);
 670         }
 671
 672         if (!fb) {
 673                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 674                 goto out;
 675         }
 676
 677         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 678         ifbdev->fb = fb;
 679
 680         drm_framebuffer_reference(&ifbdev->fb->base);
 681
 682         /* Final pass to check if any active pipes don't have fbs */
 683         for_each_crtc(dev, crtc) {
 684                 intel_crtc = to_intel_crtc(crtc);
 685
 686                 if (!intel_crtc->active)
 687                         continue;
 688
 689                 WARN(!crtc->primary->fb,
 690                      "re-used BIOS config but lost an fb on crtc %d\n",
 691                      crtc->base.id);
 692         }
 693
 694
 695         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 696         return true;
 697
 698 out:
 699
 700         return false;
 701 }
 702
 703 static void intel_fbdev_suspend_worker(struct work_struct *work)
 704 {
 705         intel_fbdev_set_suspend(container_of(work,
 706                                              struct drm_i915_private,
 707                                              fbdev_suspend_work)->dev,
 708                                 FBINFO_STATE_RUNNING,
 709                                 true);
 710 }
 711
 712 int intel_fbdev_init(struct drm_device *dev)
 713 {
 714         struct intel_fbdev *ifbdev;
 715         struct drm_i915_private *dev_priv = dev->dev_private;
 716         int ret;
 717
 718         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 719                 return -ENODEV;
 720
 721         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 722         if (ifbdev == NULL)
 723                 return -ENOMEM;
 724
 725         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 726
 727         if (!intel_fbdev_init_bios(dev, ifbdev))
 728                 ifbdev->preferred_bpp = 32;
 729
 730         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 731                                  INTEL_INFO(dev)->num_pipes, 4);
 732         if (ret) {
 733                 kfree(ifbdev);
 734                 return ret;
 735         }
 736
 737         dev_priv->fbdev = ifbdev;
 738         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 739
 740         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 741
 742         return 0;
 743 }
 744
 745 void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 746 {
 747         struct drm_i915_private *dev_priv = data;
 748         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 749
 750         /* Due to peculiar init order wrt to hpd handling this is separate. */
 751         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 752 }
 753
 754 void intel_fbdev_fini(struct drm_device *dev)
 755 {
 756         struct drm_i915_private *dev_priv = dev->dev_private;
 757         if (!dev_priv->fbdev)
 758                 return;
 759
 760         flush_work(&dev_priv->fbdev_suspend_work);
 761
 762         async_synchronize_full();
 763         intel_fbdev_destroy(dev, dev_priv->fbdev);
 764         kfree(dev_priv->fbdev);
 765         dev_priv->fbdev = NULL;
 766 }
 767
 768 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 769 {
 770         struct drm_i915_private *dev_priv = dev->dev_private;
 771         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 772         struct fb_info *info;
 773
 774         if (!ifbdev)
 775                 return;
 776
 777         info = ifbdev->helper.fbdev;
 778
 779         if (synchronous) {
 780                 /* Flush any pending work to turn the console on, and then
 781                  * wait to turn it off. It must be synchronous as we are
 782                  * about to suspend or unload the driver.
 783                  *
 784                  * Note that from within the work-handler, we cannot flush
 785                  * ourselves, so only flush outstanding work upon suspend!
 786                  */
 787                 if (state != FBINFO_STATE_RUNNING)
 788                         flush_work(&dev_priv->fbdev_suspend_work);
 789                 console_lock();
 790         } else {
 791                 /*
 792                  * The console lock can be pretty contented on resume due
 793                  * to all the printk activity.  Try to keep it out of the hot
 794                  * path of resume if possible.
 795                  */
 796                 WARN_ON(state != FBINFO_STATE_RUNNING);
 797                 if (!console_trylock()) {
 798                         /* Don't block our own workqueue as this can
 799                          * be run in parallel with other i915.ko tasks.
 800                          */
 801                         schedule_work(&dev_priv->fbdev_suspend_work);
 802                         return;
 803                 }
 804         }
 805
 806         /* On resume from hibernation: If the object is shmemfs backed, it has
 807          * been restored from swap. If the object is stolen however, it will be
 808          * full of whatever garbage was left in there.
 809          */
 810         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 811                 memset_io(info->screen_base, 0, info->screen_size);
 812
 813         fb_set_suspend(info, state);
 814         console_unlock();
 815 }
 816
 817 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 818 {
 819         struct drm_i915_private *dev_priv = dev->dev_private;
 820         if (dev_priv->fbdev)
 821                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 822 }
 823
 824 void intel_fbdev_restore_mode(struct drm_device *dev)
 825 {
 826         int ret;
 827         struct drm_i915_private *dev_priv = dev->dev_private;
 828
 829         if (!dev_priv->fbdev)
 830                 return;
 831
 832         ret = drm_fb_helper_restore_fbdev_mode_unlocked(&dev_priv->fbdev->helper);
 833         if (ret)
 834                 DRM_DEBUG("failed to restore crtc mode\n");
 835 }