kernel/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                 mutex_lock(&fb_helper->dev->struct_mutex);
  59                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  60                 mutex_unlock(&fb_helper->dev->struct_mutex);
  61         }
  62
  63         return ret;
  64 }
  65
  66 static int intel_fbdev_blank(int blank, struct fb_info *info)
  67 {
  68         struct drm_fb_helper *fb_helper = info->par;
  69         struct intel_fbdev *ifbdev =
  70                 container_of(fb_helper, struct intel_fbdev, helper);
  71         int ret;
  72
  73         ret = drm_fb_helper_blank(blank, info);
  74
  75         if (ret == 0) {
  76                 mutex_lock(&fb_helper->dev->struct_mutex);
  77                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  78                 mutex_unlock(&fb_helper->dev->struct_mutex);
  79         }
  80
  81         return ret;
  82 }
  83
  84 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  85                                    struct fb_info *info)
  86 {
  87         struct drm_fb_helper *fb_helper = info->par;
  88         struct intel_fbdev *ifbdev =
  89                 container_of(fb_helper, struct intel_fbdev, helper);
  90
  91         int ret;
  92         ret = drm_fb_helper_pan_display(var, info);
  93
  94         if (ret == 0) {
  95                 mutex_lock(&fb_helper->dev->struct_mutex);
  96                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  97                 mutex_unlock(&fb_helper->dev->struct_mutex);
  98         }
  99
 100         return ret;
 101 }
 102
 103 static struct fb_ops intelfb_ops = {
 104         .owner = THIS_MODULE,
 105         .fb_check_var = drm_fb_helper_check_var,
 106         .fb_set_par = intel_fbdev_set_par,
 107         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 108         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 109         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 110         .fb_pan_display = intel_fbdev_pan_display,
 111         .fb_blank = intel_fbdev_blank,
 112         .fb_setcmap = drm_fb_helper_setcmap,
 113         .fb_debug_enter = drm_fb_helper_debug_enter,
 114         .fb_debug_leave = drm_fb_helper_debug_leave,
 115 };
 116
 117 static int intelfb_alloc(struct drm_fb_helper *helper,
 118                          struct drm_fb_helper_surface_size *sizes)
 119 {
 120         struct intel_fbdev *ifbdev =
 121                 container_of(helper, struct intel_fbdev, helper);
 122         struct drm_framebuffer *fb;
 123         struct drm_device *dev = helper->dev;
 124         struct drm_i915_private *dev_priv = to_i915(dev);
 125         struct drm_mode_fb_cmd2 mode_cmd = {};
 126         struct drm_i915_gem_object *obj = NULL;
 127         int size, ret;
 128
 129         /* we don't do packed 24bpp */
 130         if (sizes->surface_bpp == 24)
 131                 sizes->surface_bpp = 32;
 132
 133         mode_cmd.width = sizes->surface_width;
 134         mode_cmd.height = sizes->surface_height;
 135
 136         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 137                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 138         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 139                                                           sizes->surface_depth);
 140
 141         size = mode_cmd.pitches[0] * mode_cmd.height;
 142         size = PAGE_ALIGN(size);
 143
 144         /* If the FB is too big, just don't use it since fbdev is not very
 145          * important and we should probably use that space with FBC or other
 146          * features. */
 147         if (size * 2 < dev_priv->gtt.stolen_usable_size)
 148                 obj = i915_gem_object_create_stolen(dev, size);
 149         if (obj == NULL)
 150                 obj = i915_gem_alloc_object(dev, size);
 151         if (!obj) {
 152                 DRM_ERROR("failed to allocate framebuffer\n");
 153                 ret = -ENOMEM;
 154                 goto out;
 155         }
 156
 157         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 158         if (IS_ERR(fb)) {
 159                 ret = PTR_ERR(fb);
 160                 goto out_unref;
 161         }
 162
 163         /* Flush everything out, we'll be doing GTT only from now on */
 164         ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL, NULL, NULL);
 165         if (ret) {
 166                 DRM_ERROR("failed to pin obj: %d\n", ret);
 167                 goto out_fb;
 168         }
 169
 170         ifbdev->fb = to_intel_framebuffer(fb);
 171
 172         return 0;
 173
 174 out_fb:
 175         drm_framebuffer_remove(fb);
 176 out_unref:
 177         drm_gem_object_unreference(&obj->base);
 178 out:
 179         return ret;
 180 }
 181
 182 static int intelfb_create(struct drm_fb_helper *helper,
 183                           struct drm_fb_helper_surface_size *sizes)
 184 {
 185         struct intel_fbdev *ifbdev =
 186                 container_of(helper, struct intel_fbdev, helper);
 187         struct intel_framebuffer *intel_fb = ifbdev->fb;
 188         struct drm_device *dev = helper->dev;
 189         struct drm_i915_private *dev_priv = dev->dev_private;
 190         struct fb_info *info;
 191         struct drm_framebuffer *fb;
 192         struct drm_i915_gem_object *obj;
 193         int size, ret;
 194         bool prealloc = false;
 195
 196         mutex_lock(&dev->struct_mutex);
 197
 198         if (intel_fb &&
 199             (sizes->fb_width > intel_fb->base.width ||
 200              sizes->fb_height > intel_fb->base.height)) {
 201                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 202                               " releasing it\n",
 203                               intel_fb->base.width, intel_fb->base.height,
 204                               sizes->fb_width, sizes->fb_height);
 205                 drm_framebuffer_unreference(&intel_fb->base);
 206                 intel_fb = ifbdev->fb = NULL;
 207         }
 208         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 209                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 210                 ret = intelfb_alloc(helper, sizes);
 211                 if (ret)
 212                         goto out_unlock;
 213                 intel_fb = ifbdev->fb;
 214         } else {
 215                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 216                 prealloc = true;
 217                 sizes->fb_width = intel_fb->base.width;
 218                 sizes->fb_height = intel_fb->base.height;
 219         }
 220
 221         obj = intel_fb->obj;
 222         size = obj->base.size;
 223
 224         info = drm_fb_helper_alloc_fbi(helper);
 225         if (IS_ERR(info)) {
 226                 ret = PTR_ERR(info);
 227                 goto out_unpin;
 228         }
 229
 230         info->par = helper;
 231
 232         fb = &ifbdev->fb->base;
 233
 234         ifbdev->helper.fb = fb;
 235
 236         strcpy(info->fix.id, "inteldrmfb");
 237
 238         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 239         info->fbops = &intelfb_ops;
 240
 241         /* setup aperture base/size for vesafb takeover */
 242         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 243         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 244
 245         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 246         info->fix.smem_len = size;
 247
 248         info->screen_base =
 249                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 250                            size);
 251         if (!info->screen_base) {
 252                 ret = -ENOSPC;
 253                 goto out_destroy_fbi;
 254         }
 255         info->screen_size = size;
 256
 257         /* This driver doesn't need a VT switch to restore the mode on resume */
 258         info->skip_vt_switch = true;
 259
 260         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 261         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 262
 263         /* If the object is shmemfs backed, it will have given us zeroed pages.
 264          * If the object is stolen however, it will be full of whatever
 265          * garbage was left in there.
 266          */
 267         if (ifbdev->fb->obj->stolen && !prealloc)
 268                 memset_io(info->screen_base, 0, info->screen_size);
 269
 270         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 271
 272         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08llx, bo %p\n",
 273                       fb->width, fb->height,
 274                       i915_gem_obj_ggtt_offset(obj), obj);
 275
 276         mutex_unlock(&dev->struct_mutex);
 277         vga_switcheroo_client_fb_set(dev->pdev, info);
 278         return 0;
 279
 280 out_destroy_fbi:
 281         drm_fb_helper_release_fbi(helper);
 282 out_unpin:
 283         i915_gem_object_ggtt_unpin(obj);
 284         drm_gem_object_unreference(&obj->base);
 285 out_unlock:
 286         mutex_unlock(&dev->struct_mutex);
 287         return ret;
 288 }
 289
 290 /** Sets the color ramps on behalf of RandR */
 291 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 292                                     u16 blue, int regno)
 293 {
 294         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 295
 296         intel_crtc->lut_r[regno] = red >> 8;
 297         intel_crtc->lut_g[regno] = green >> 8;
 298         intel_crtc->lut_b[regno] = blue >> 8;
 299 }
 300
 301 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 302                                     u16 *blue, int regno)
 303 {
 304         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 305
 306         *red = intel_crtc->lut_r[regno] << 8;
 307         *green = intel_crtc->lut_g[regno] << 8;
 308         *blue = intel_crtc->lut_b[regno] << 8;
 309 }
 310
 311 static struct drm_fb_helper_crtc *
 312 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 313 {
 314         int i;
 315
 316         for (i = 0; i < fb_helper->crtc_count; i++)
 317                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 318                         return &fb_helper->crtc_info[i];
 319
 320         return NULL;
 321 }
 322
 323 /*
 324  * Try to read the BIOS display configuration and use it for the initial
 325  * fb configuration.
 326  *
 327  * The BIOS or boot loader will generally create an initial display
 328  * configuration for us that includes some set of active pipes and displays.
 329  * This routine tries to figure out which pipes and connectors are active
 330  * and stuffs them into the crtcs and modes array given to us by the
 331  * drm_fb_helper code.
 332  *
 333  * The overall sequence is:
 334  *   intel_fbdev_init - from driver load
 335  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 336  *     drm_fb_helper_init - build fb helper structs
 337  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 338  *   intel_fbdev_initial_config - apply the config
 339  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 340  *         drm_setup_crtcs - build crtc config for fbdev
 341  *           intel_fb_initial_config - find active connectors etc
 342  *         drm_fb_helper_single_fb_probe - set up fbdev
 343  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 344  *
 345  * Note that we don't make special consideration whether we could actually
 346  * switch to the selected modes without a full modeset. E.g. when the display
 347  * is in VGA mode we need to recalculate watermarks and set a new high-res
 348  * framebuffer anyway.
 349  */
 350 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 351                                     struct drm_fb_helper_crtc **crtcs,
 352                                     struct drm_display_mode **modes,
 353                                     struct drm_fb_offset *offsets,
 354                                     bool *enabled, int width, int height)
 355 {
 356         struct drm_device *dev = fb_helper->dev;
 357         int i, j;
 358         bool *save_enabled;
 359         bool fallback = true;
 360         int num_connectors_enabled = 0;
 361         int num_connectors_detected = 0;
 362         uint64_t conn_configured = 0, mask;
 363         int pass = 0;
 364
 365         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 366                                GFP_KERNEL);
 367         if (!save_enabled)
 368                 return false;
 369
 370         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 371         mask = (1 << fb_helper->connector_count) - 1;
 372 retry:
 373         for (i = 0; i < fb_helper->connector_count; i++) {
 374                 struct drm_fb_helper_connector *fb_conn;
 375                 struct drm_connector *connector;
 376                 struct drm_encoder *encoder;
 377                 struct drm_fb_helper_crtc *new_crtc;
 378
 379                 fb_conn = fb_helper->connector_info[i];
 380                 connector = fb_conn->connector;
 381
 382                 if (conn_configured & (1 << i))
 383                         continue;
 384
 385                 if (pass == 0 && !connector->has_tile)
 386                         continue;
 387
 388                 if (connector->status == connector_status_connected)
 389                         num_connectors_detected++;
 390
 391                 if (!enabled[i]) {
 392                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 393                                       connector->name);
 394                         conn_configured |= (1 << i);
 395                         continue;
 396                 }
 397
 398                 if (connector->force == DRM_FORCE_OFF) {
 399                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 400                                       connector->name);
 401                         enabled[i] = false;
 402                         continue;
 403                 }
 404
 405                 encoder = connector->encoder;
 406                 if (!encoder || WARN_ON(!encoder->crtc)) {
 407                         if (connector->force > DRM_FORCE_OFF)
 408                                 goto bail;
 409
 410                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 411                                       connector->name);
 412                         enabled[i] = false;
 413                         conn_configured |= (1 << i);
 414                         continue;
 415                 }
 416
 417                 num_connectors_enabled++;
 418
 419                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 420
 421                 /*
 422                  * Make sure we're not trying to drive multiple connectors
 423                  * with a single CRTC, since our cloning support may not
 424                  * match the BIOS.
 425                  */
 426                 for (j = 0; j < fb_helper->connector_count; j++) {
 427                         if (crtcs[j] == new_crtc) {
 428                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 429                                 goto bail;
 430                         }
 431                 }
 432
 433                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 434                               connector->name);
 435
 436                 /* go for command line mode first */
 437                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 438
 439                 /* try for preferred next */
 440                 if (!modes[i]) {
 441                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 442                                       connector->name, connector->has_tile);
 443                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 444                                                           height);
 445                 }
 446
 447                 /* No preferred mode marked by the EDID? Are there any modes? */
 448                 if (!modes[i] && !list_empty(&connector->modes)) {
 449                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 450                                       connector->name);
 451                         modes[i] = list_first_entry(&connector->modes,
 452                                                     struct drm_display_mode,
 453                                                     head);
 454                 }
 455
 456                 /* last resort: use current mode */
 457                 if (!modes[i]) {
 458                         /*
 459                          * IMPORTANT: We want to use the adjusted mode (i.e.
 460                          * after the panel fitter upscaling) as the initial
 461                          * config, not the input mode, which is what crtc->mode
 462                          * usually contains. But since our current
 463                          * code puts a mode derived from the post-pfit timings
 464                          * into crtc->mode this works out correctly.
 465                          */
 466                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 467                                       connector->name);
 468                         modes[i] = &encoder->crtc->mode;
 469                 }
 470                 crtcs[i] = new_crtc;
 471
 472                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 473                               connector->name,
 474                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
 475                               encoder->crtc->base.id,
 476                               modes[i]->hdisplay, modes[i]->vdisplay,
 477                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 478
 479                 fallback = false;
 480                 conn_configured |= (1 << i);
 481         }
 482
 483         if ((conn_configured & mask) != mask) {
 484                 pass++;
 485                 goto retry;
 486         }
 487
 488         /*
 489          * If the BIOS didn't enable everything it could, fall back to have the
 490          * same user experiencing of lighting up as much as possible like the
 491          * fbdev helper library.
 492          */
 493         if (num_connectors_enabled != num_connectors_detected &&
 494             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 495                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 496                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 497                               num_connectors_detected);
 498                 fallback = true;
 499         }
 500
 501         if (fallback) {
 502 bail:
 503                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 504                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 505                 kfree(save_enabled);
 506                 return false;
 507         }
 508
 509         kfree(save_enabled);
 510         return true;
 511 }
 512
 513 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 514         .initial_config = intel_fb_initial_config,
 515         .gamma_set = intel_crtc_fb_gamma_set,
 516         .gamma_get = intel_crtc_fb_gamma_get,
 517         .fb_probe = intelfb_create,
 518 };
 519
 520 static void intel_fbdev_destroy(struct drm_device *dev,
 521                                 struct intel_fbdev *ifbdev)
 522 {
 523
 524         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 525         drm_fb_helper_release_fbi(&ifbdev->helper);
 526
 527         drm_fb_helper_fini(&ifbdev->helper);
 528
 529         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 530         drm_framebuffer_remove(&ifbdev->fb->base);
 531 }
 532
 533 /*
 534  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 535  * The core display code will have read out the current plane configuration,
 536  * so we use that to figure out if there's an object for us to use as the
 537  * fb, and if so, we re-use it for the fbdev configuration.
 538  *
 539  * Note we only support a single fb shared across pipes for boot (mostly for
 540  * fbcon), so we just find the biggest and use that.
 541  */
 542 static bool intel_fbdev_init_bios(struct drm_device *dev,
 543                                  struct intel_fbdev *ifbdev)
 544 {
 545         struct intel_framebuffer *fb = NULL;
 546         struct drm_crtc *crtc;
 547         struct intel_crtc *intel_crtc;
 548         unsigned int max_size = 0;
 549
 550         /* Find the largest fb */
 551         for_each_crtc(dev, crtc) {
 552                 struct drm_i915_gem_object *obj =
 553                         intel_fb_obj(crtc->primary->state->fb);
 554                 intel_crtc = to_intel_crtc(crtc);
 555
 556                 if (!crtc->state->active || !obj) {
 557                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 558                                       pipe_name(intel_crtc->pipe));
 559                         continue;
 560                 }
 561
 562                 if (obj->base.size > max_size) {
 563                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 564                                       pipe_name(intel_crtc->pipe));
 565                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 566                         max_size = obj->base.size;
 567                 }
 568         }
 569
 570         if (!fb) {
 571                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 572                 goto out;
 573         }
 574
 575         /* Now make sure all the pipes will fit into it */
 576         for_each_crtc(dev, crtc) {
 577                 unsigned int cur_size;
 578
 579                 intel_crtc = to_intel_crtc(crtc);
 580
 581                 if (!crtc->state->active) {
 582                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 583                                       pipe_name(intel_crtc->pipe));
 584                         continue;
 585                 }
 586
 587                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 588                               pipe_name(intel_crtc->pipe));
 589
 590                 /*
 591                  * See if the plane fb we found above will fit on this
 592                  * pipe.  Note we need to use the selected fb's pitch and bpp
 593                  * rather than the current pipe's, since they differ.
 594                  */
 595                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 596                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 597                 if (fb->base.pitches[0] < cur_size) {
 598                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 599                                       pipe_name(intel_crtc->pipe),
 600                                       cur_size, fb->base.pitches[0]);
 601                         fb = NULL;
 602                         break;
 603                 }
 604
 605                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 606                 cur_size = intel_fb_align_height(dev, cur_size,
 607                                                  fb->base.pixel_format,
 608                                                  fb->base.modifier[0]);
 609                 cur_size *= fb->base.pitches[0];
 610                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 611                               pipe_name(intel_crtc->pipe),
 612                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 613                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 614                               fb->base.bits_per_pixel,
 615                               cur_size);
 616
 617                 if (cur_size > max_size) {
 618                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 619                                       pipe_name(intel_crtc->pipe),
 620                                       cur_size, max_size);
 621                         fb = NULL;
 622                         break;
 623                 }
 624
 625                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 626                               pipe_name(intel_crtc->pipe),
 627                               max_size, cur_size);
 628         }
 629
 630         if (!fb) {
 631                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 632                 goto out;
 633         }
 634
 635         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 636         ifbdev->fb = fb;
 637
 638         drm_framebuffer_reference(&ifbdev->fb->base);
 639
 640         /* Final pass to check if any active pipes don't have fbs */
 641         for_each_crtc(dev, crtc) {
 642                 intel_crtc = to_intel_crtc(crtc);
 643
 644                 if (!crtc->state->active)
 645                         continue;
 646
 647                 WARN(!crtc->primary->fb,
 648                      "re-used BIOS config but lost an fb on crtc %d\n",
 649                      crtc->base.id);
 650         }
 651
 652
 653         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 654         return true;
 655
 656 out:
 657
 658         return false;
 659 }
 660
 661 static void intel_fbdev_suspend_worker(struct work_struct *work)
 662 {
 663         intel_fbdev_set_suspend(container_of(work,
 664                                              struct drm_i915_private,
 665                                              fbdev_suspend_work)->dev,
 666                                 FBINFO_STATE_RUNNING,
 667                                 true);
 668 }
 669
 670 int intel_fbdev_init(struct drm_device *dev)
 671 {
 672         struct intel_fbdev *ifbdev;
 673         struct drm_i915_private *dev_priv = dev->dev_private;
 674         int ret;
 675
 676         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 677                 return -ENODEV;
 678
 679         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 680         if (ifbdev == NULL)
 681                 return -ENOMEM;
 682
 683         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 684
 685         if (!intel_fbdev_init_bios(dev, ifbdev))
 686                 ifbdev->preferred_bpp = 32;
 687
 688         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 689                                  INTEL_INFO(dev)->num_pipes, 4);
 690         if (ret) {
 691                 kfree(ifbdev);
 692                 return ret;
 693         }
 694
 695         ifbdev->helper.atomic = true;
 696
 697         dev_priv->fbdev = ifbdev;
 698         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 699
 700         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 701
 702         return 0;
 703 }
 704
 705 void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 706 {
 707         struct drm_i915_private *dev_priv = data;
 708         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 709
 710         /* Due to peculiar init order wrt to hpd handling this is separate. */
 711         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 712 }
 713
 714 void intel_fbdev_fini(struct drm_device *dev)
 715 {
 716         struct drm_i915_private *dev_priv = dev->dev_private;
 717         if (!dev_priv->fbdev)
 718                 return;
 719
 720         flush_work(&dev_priv->fbdev_suspend_work);
 721
 722         async_synchronize_full();
 723         intel_fbdev_destroy(dev, dev_priv->fbdev);
 724         kfree(dev_priv->fbdev);
 725         dev_priv->fbdev = NULL;
 726 }
 727
 728 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 729 {
 730         struct drm_i915_private *dev_priv = dev->dev_private;
 731         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 732         struct fb_info *info;
 733
 734         if (!ifbdev)
 735                 return;
 736
 737         info = ifbdev->helper.fbdev;
 738
 739         if (synchronous) {
 740                 /* Flush any pending work to turn the console on, and then
 741                  * wait to turn it off. It must be synchronous as we are
 742                  * about to suspend or unload the driver.
 743                  *
 744                  * Note that from within the work-handler, we cannot flush
 745                  * ourselves, so only flush outstanding work upon suspend!
 746                  */
 747                 if (state != FBINFO_STATE_RUNNING)
 748                         flush_work(&dev_priv->fbdev_suspend_work);
 749                 console_lock();
 750         } else {
 751                 /*
 752                  * The console lock can be pretty contented on resume due
 753                  * to all the printk activity.  Try to keep it out of the hot
 754                  * path of resume if possible.
 755                  */
 756                 WARN_ON(state != FBINFO_STATE_RUNNING);
 757                 if (!console_trylock()) {
 758                         /* Don't block our own workqueue as this can
 759                          * be run in parallel with other i915.ko tasks.
 760                          */
 761                         schedule_work(&dev_priv->fbdev_suspend_work);
 762                         return;
 763                 }
 764         }
 765
 766         /* On resume from hibernation: If the object is shmemfs backed, it has
 767          * been restored from swap. If the object is stolen however, it will be
 768          * full of whatever garbage was left in there.
 769          */
 770         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 771                 memset_io(info->screen_base, 0, info->screen_size);
 772
 773         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 774         console_unlock();
 775 }
 776
 777 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 778 {
 779         struct drm_i915_private *dev_priv = dev->dev_private;
 780         if (dev_priv->fbdev)
 781                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 782 }
 783
 784 void intel_fbdev_restore_mode(struct drm_device *dev)
 785 {
 786         int ret;
 787         struct drm_i915_private *dev_priv = dev->dev_private;
 788         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 789         struct drm_fb_helper *fb_helper;
 790
 791         if (!ifbdev)
 792                 return;
 793
 794         fb_helper = &ifbdev->helper;
 795
 796         ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 797         if (ret) {
 798                 DRM_DEBUG("failed to restore crtc mode\n");
 799         } else {
 800                 mutex_lock(&fb_helper->dev->struct_mutex);
 801                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 802                 mutex_unlock(&fb_helper->dev->struct_mutex);
 803         }
 804 }