drivers/gpu/drm/i915/display/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/console.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/init.h>
  32 #include <linux/kernel.h>
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/string.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/tty.h>
  38 #include <linux/vga_switcheroo.h>
  39
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include <drm/drm_fourcc.h>
  43
  44 #include "gem/i915_gem_lmem.h"
  45
  46 #include "i915_drv.h"
  47 #include "intel_display_types.h"
  48 #include "intel_fb.h"
  49 #include "intel_fb_pin.h"
  50 #include "intel_fbdev.h"
  51 #include "intel_frontbuffer.h"
  52
  53 struct intel_fbdev {
  54         struct drm_fb_helper helper;
  55         struct intel_framebuffer *fb;
  56         struct i915_vma *vma;
  57         unsigned long vma_flags;
  58         async_cookie_t cookie;
  59         int preferred_bpp;
  60
  61         /* Whether or not fbdev hpd processing is temporarily suspended */
  62         bool hpd_suspended: 1;
  63         /* Set when a hotplug was received while HPD processing was suspended */
  64         bool hpd_waiting: 1;
  65
  66         /* Protects hpd_suspended */
  67         struct mutex hpd_lock;
  68 };
  69
  70 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
  71 {
  72         return ifbdev->fb->frontbuffer;
  73 }
  74
  75 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  76 {
  77         intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
  78 }
  79
  80 static int intel_fbdev_set_par(struct fb_info *info)
  81 {
  82         struct drm_fb_helper *fb_helper = info->par;
  83         struct intel_fbdev *ifbdev =
  84                 container_of(fb_helper, struct intel_fbdev, helper);
  85         int ret;
  86
  87         ret = drm_fb_helper_set_par(info);
  88         if (ret == 0)
  89                 intel_fbdev_invalidate(ifbdev);
  90
  91         return ret;
  92 }
  93
  94 static int intel_fbdev_blank(int blank, struct fb_info *info)
  95 {
  96         struct drm_fb_helper *fb_helper = info->par;
  97         struct intel_fbdev *ifbdev =
  98                 container_of(fb_helper, struct intel_fbdev, helper);
  99         int ret;
 100
 101         ret = drm_fb_helper_blank(blank, info);
 102         if (ret == 0)
 103                 intel_fbdev_invalidate(ifbdev);
 104
 105         return ret;
 106 }
 107
 108 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 109                                    struct fb_info *info)
 110 {
 111         struct drm_fb_helper *fb_helper = info->par;
 112         struct intel_fbdev *ifbdev =
 113                 container_of(fb_helper, struct intel_fbdev, helper);
 114         int ret;
 115
 116         ret = drm_fb_helper_pan_display(var, info);
 117         if (ret == 0)
 118                 intel_fbdev_invalidate(ifbdev);
 119
 120         return ret;
 121 }
 122
 123 static const struct fb_ops intelfb_ops = {
 124         .owner = THIS_MODULE,
 125         DRM_FB_HELPER_DEFAULT_OPS,
 126         .fb_set_par = intel_fbdev_set_par,
 127         .fb_read = drm_fb_helper_cfb_read,
 128         .fb_write = drm_fb_helper_cfb_write,
 129         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 130         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 131         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 132         .fb_pan_display = intel_fbdev_pan_display,
 133         .fb_blank = intel_fbdev_blank,
 134 };
 135
 136 static int intelfb_alloc(struct drm_fb_helper *helper,
 137                          struct drm_fb_helper_surface_size *sizes)
 138 {
 139         struct intel_fbdev *ifbdev =
 140                 container_of(helper, struct intel_fbdev, helper);
 141         struct drm_framebuffer *fb;
 142         struct drm_device *dev = helper->dev;
 143         struct drm_i915_private *dev_priv = to_i915(dev);
 144         struct drm_mode_fb_cmd2 mode_cmd = {};
 145         struct drm_i915_gem_object *obj;
 146         int size;
 147
 148         /* we don't do packed 24bpp */
 149         if (sizes->surface_bpp == 24)
 150                 sizes->surface_bpp = 32;
 151
 152         mode_cmd.width = sizes->surface_width;
 153         mode_cmd.height = sizes->surface_height;
 154
 155         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 156                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 157         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 158                                                           sizes->surface_depth);
 159
 160         size = mode_cmd.pitches[0] * mode_cmd.height;
 161         size = PAGE_ALIGN(size);
 162
 163         obj = ERR_PTR(-ENODEV);
 164         if (HAS_LMEM(dev_priv)) {
 165                 obj = i915_gem_object_create_lmem(dev_priv, size,
 166                                                   I915_BO_ALLOC_CONTIGUOUS);
 167         } else {
 168                 /*
 169                  * If the FB is too big, just don't use it since fbdev is not very
 170                  * important and we should probably use that space with FBC or other
 171                  * features.
 172                  */
 173                 if (size * 2 < dev_priv->stolen_usable_size)
 174                         obj = i915_gem_object_create_stolen(dev_priv, size);
 175                 if (IS_ERR(obj))
 176                         obj = i915_gem_object_create_shmem(dev_priv, size);
 177         }
 178
 179         if (IS_ERR(obj)) {
 180                 drm_err(&dev_priv->drm, "failed to allocate framebuffer (%pe)\n", obj);
 181                 return PTR_ERR(obj);
 182         }
 183
 184         fb = intel_framebuffer_create(obj, &mode_cmd);
 185         i915_gem_object_put(obj);
 186         if (IS_ERR(fb))
 187                 return PTR_ERR(fb);
 188
 189         ifbdev->fb = to_intel_framebuffer(fb);
 190         return 0;
 191 }
 192
 193 static int intelfb_create(struct drm_fb_helper *helper,
 194                           struct drm_fb_helper_surface_size *sizes)
 195 {
 196         struct intel_fbdev *ifbdev =
 197                 container_of(helper, struct intel_fbdev, helper);
 198         struct intel_framebuffer *intel_fb = ifbdev->fb;
 199         struct drm_device *dev = helper->dev;
 200         struct drm_i915_private *dev_priv = to_i915(dev);
 201         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 202         struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
 203         const struct i915_gtt_view view = {
 204                 .type = I915_GTT_VIEW_NORMAL,
 205         };
 206         intel_wakeref_t wakeref;
 207         struct fb_info *info;
 208         struct i915_vma *vma;
 209         unsigned long flags = 0;
 210         bool prealloc = false;
 211         void __iomem *vaddr;
 212         struct drm_i915_gem_object *obj;
 213         int ret;
 214
 215         mutex_lock(&ifbdev->hpd_lock);
 216         ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
 217         mutex_unlock(&ifbdev->hpd_lock);
 218         if (ret)
 219                 return ret;
 220
 221         if (intel_fb &&
 222             (sizes->fb_width > intel_fb->base.width ||
 223              sizes->fb_height > intel_fb->base.height)) {
 224                 drm_dbg_kms(&dev_priv->drm,
 225                             "BIOS fb too small (%dx%d), we require (%dx%d),"
 226                             " releasing it\n",
 227                             intel_fb->base.width, intel_fb->base.height,
 228                             sizes->fb_width, sizes->fb_height);
 229                 drm_framebuffer_put(&intel_fb->base);
 230                 intel_fb = ifbdev->fb = NULL;
 231         }
 232         if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
 233                 drm_dbg_kms(&dev_priv->drm,
 234                             "no BIOS fb, allocating a new one\n");
 235                 ret = intelfb_alloc(helper, sizes);
 236                 if (ret)
 237                         return ret;
 238                 intel_fb = ifbdev->fb;
 239         } else {
 240                 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 241                 prealloc = true;
 242                 sizes->fb_width = intel_fb->base.width;
 243                 sizes->fb_height = intel_fb->base.height;
 244         }
 245
 246         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 247
 248         /* Pin the GGTT vma for our access via info->screen_base.
 249          * This also validates that any existing fb inherited from the
 250          * BIOS is suitable for own access.
 251          */
 252         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
 253                                          &view, false, &flags);
 254         if (IS_ERR(vma)) {
 255                 ret = PTR_ERR(vma);
 256                 goto out_unlock;
 257         }
 258
 259         info = drm_fb_helper_alloc_info(helper);
 260         if (IS_ERR(info)) {
 261                 drm_err(&dev_priv->drm, "Failed to allocate fb_info (%pe)\n", info);
 262                 ret = PTR_ERR(info);
 263                 goto out_unpin;
 264         }
 265
 266         ifbdev->helper.fb = &ifbdev->fb->base;
 267
 268         info->fbops = &intelfb_ops;
 269
 270         obj = intel_fb_obj(&intel_fb->base);
 271         if (i915_gem_object_is_lmem(obj)) {
 272                 struct intel_memory_region *mem = obj->mm.region;
 273
 274                 /* Use fbdev's framebuffer from lmem for discrete */
 275                 info->fix.smem_start =
 276                         (unsigned long)(mem->io_start +
 277                                         i915_gem_object_get_dma_address(obj, 0));
 278                 info->fix.smem_len = obj->base.size;
 279         } else {
 280                 /* Our framebuffer is the entirety of fbdev's system memory */
 281                 info->fix.smem_start =
 282                         (unsigned long)(ggtt->gmadr.start + vma->node.start);
 283                 info->fix.smem_len = vma->size;
 284         }
 285
 286         vaddr = i915_vma_pin_iomap(vma);
 287         if (IS_ERR(vaddr)) {
 288                 drm_err(&dev_priv->drm,
 289                         "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
 290                 ret = PTR_ERR(vaddr);
 291                 goto out_unpin;
 292         }
 293         info->screen_base = vaddr;
 294         info->screen_size = vma->size;
 295
 296         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 297
 298         /* If the object is shmemfs backed, it will have given us zeroed pages.
 299          * If the object is stolen however, it will be full of whatever
 300          * garbage was left in there.
 301          */
 302         if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
 303                 memset_io(info->screen_base, 0, info->screen_size);
 304
 305         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 306
 307         drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
 308                     ifbdev->fb->base.width, ifbdev->fb->base.height,
 309                     i915_ggtt_offset(vma));
 310         ifbdev->vma = vma;
 311         ifbdev->vma_flags = flags;
 312
 313         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 314         vga_switcheroo_client_fb_set(pdev, info);
 315         return 0;
 316
 317 out_unpin:
 318         intel_unpin_fb_vma(vma, flags);
 319 out_unlock:
 320         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 321         return ret;
 322 }
 323
 324 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 325         .fb_probe = intelfb_create,
 326 };
 327
 328 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 329 {
 330         /* We rely on the object-free to release the VMA pinning for
 331          * the info->screen_base mmaping. Leaking the VMA is simpler than
 332          * trying to rectify all the possible error paths leading here.
 333          */
 334
 335         drm_fb_helper_fini(&ifbdev->helper);
 336
 337         if (ifbdev->vma)
 338                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 339
 340         if (ifbdev->fb)
 341                 drm_framebuffer_remove(&ifbdev->fb->base);
 342
 343         kfree(ifbdev);
 344 }
 345
 346 /*
 347  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 348  * The core display code will have read out the current plane configuration,
 349  * so we use that to figure out if there's an object for us to use as the
 350  * fb, and if so, we re-use it for the fbdev configuration.
 351  *
 352  * Note we only support a single fb shared across pipes for boot (mostly for
 353  * fbcon), so we just find the biggest and use that.
 354  */
 355 static bool intel_fbdev_init_bios(struct drm_device *dev,
 356                                   struct intel_fbdev *ifbdev)
 357 {
 358         struct drm_i915_private *i915 = to_i915(dev);
 359         struct intel_framebuffer *fb = NULL;
 360         struct intel_crtc *crtc;
 361         unsigned int max_size = 0;
 362
 363         /* Find the largest fb */
 364         for_each_intel_crtc(dev, crtc) {
 365                 struct intel_crtc_state *crtc_state =
 366                         to_intel_crtc_state(crtc->base.state);
 367                 struct intel_plane *plane =
 368                         to_intel_plane(crtc->base.primary);
 369                 struct intel_plane_state *plane_state =
 370                         to_intel_plane_state(plane->base.state);
 371                 struct drm_i915_gem_object *obj =
 372                         intel_fb_obj(plane_state->uapi.fb);
 373
 374                 if (!crtc_state->uapi.active) {
 375                         drm_dbg_kms(&i915->drm,
 376                                     "[CRTC:%d:%s] not active, skipping\n",
 377                                     crtc->base.base.id, crtc->base.name);
 378                         continue;
 379                 }
 380
 381                 if (!obj) {
 382                         drm_dbg_kms(&i915->drm,
 383                                     "[PLANE:%d:%s] no fb, skipping\n",
 384                                     plane->base.base.id, plane->base.name);
 385                         continue;
 386                 }
 387
 388                 if (obj->base.size > max_size) {
 389                         drm_dbg_kms(&i915->drm,
 390                                     "found possible fb from [PLANE:%d:%s]\n",
 391                                     plane->base.base.id, plane->base.name);
 392                         fb = to_intel_framebuffer(plane_state->uapi.fb);
 393                         max_size = obj->base.size;
 394                 }
 395         }
 396
 397         if (!fb) {
 398                 drm_dbg_kms(&i915->drm,
 399                             "no active fbs found, not using BIOS config\n");
 400                 goto out;
 401         }
 402
 403         /* Now make sure all the pipes will fit into it */
 404         for_each_intel_crtc(dev, crtc) {
 405                 struct intel_crtc_state *crtc_state =
 406                         to_intel_crtc_state(crtc->base.state);
 407                 struct intel_plane *plane =
 408                         to_intel_plane(crtc->base.primary);
 409                 unsigned int cur_size;
 410
 411                 if (!crtc_state->uapi.active) {
 412                         drm_dbg_kms(&i915->drm,
 413                                     "[CRTC:%d:%s] not active, skipping\n",
 414                                     crtc->base.base.id, crtc->base.name);
 415                         continue;
 416                 }
 417
 418                 drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
 419                             plane->base.base.id, plane->base.name);
 420
 421                 /*
 422                  * See if the plane fb we found above will fit on this
 423                  * pipe.  Note we need to use the selected fb's pitch and bpp
 424                  * rather than the current pipe's, since they differ.
 425                  */
 426                 cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
 427                 cur_size = cur_size * fb->base.format->cpp[0];
 428                 if (fb->base.pitches[0] < cur_size) {
 429                         drm_dbg_kms(&i915->drm,
 430                                     "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
 431                                     plane->base.base.id, plane->base.name,
 432                                     cur_size, fb->base.pitches[0]);
 433                         fb = NULL;
 434                         break;
 435                 }
 436
 437                 cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
 438                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 439                 cur_size *= fb->base.pitches[0];
 440                 drm_dbg_kms(&i915->drm,
 441                             "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
 442                             crtc->base.base.id, crtc->base.name,
 443                             crtc_state->uapi.adjusted_mode.crtc_hdisplay,
 444                             crtc_state->uapi.adjusted_mode.crtc_vdisplay,
 445                             fb->base.format->cpp[0] * 8,
 446                             cur_size);
 447
 448                 if (cur_size > max_size) {
 449                         drm_dbg_kms(&i915->drm,
 450                                     "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
 451                                     plane->base.base.id, plane->base.name,
 452                                     cur_size, max_size);
 453                         fb = NULL;
 454                         break;
 455                 }
 456
 457                 drm_dbg_kms(&i915->drm,
 458                             "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
 459                             plane->base.base.id, plane->base.name,
 460                             max_size, cur_size);
 461         }
 462
 463         if (!fb) {
 464                 drm_dbg_kms(&i915->drm,
 465                             "BIOS fb not suitable for all pipes, not using\n");
 466                 goto out;
 467         }
 468
 469         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 470         ifbdev->fb = fb;
 471
 472         drm_framebuffer_get(&ifbdev->fb->base);
 473
 474         /* Final pass to check if any active pipes don't have fbs */
 475         for_each_intel_crtc(dev, crtc) {
 476                 struct intel_crtc_state *crtc_state =
 477                         to_intel_crtc_state(crtc->base.state);
 478                 struct intel_plane *plane =
 479                         to_intel_plane(crtc->base.primary);
 480                 struct intel_plane_state *plane_state =
 481                         to_intel_plane_state(plane->base.state);
 482
 483                 if (!crtc_state->uapi.active)
 484                         continue;
 485
 486                 drm_WARN(dev, !plane_state->uapi.fb,
 487                          "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
 488                          plane->base.base.id, plane->base.name);
 489         }
 490
 491
 492         drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
 493         return true;
 494
 495 out:
 496
 497         return false;
 498 }
 499
 500 static void intel_fbdev_suspend_worker(struct work_struct *work)
 501 {
 502         intel_fbdev_set_suspend(&container_of(work,
 503                                               struct drm_i915_private,
 504                                               display.fbdev.suspend_work)->drm,
 505                                 FBINFO_STATE_RUNNING,
 506                                 true);
 507 }
 508
 509 int intel_fbdev_init(struct drm_device *dev)
 510 {
 511         struct drm_i915_private *dev_priv = to_i915(dev);
 512         struct intel_fbdev *ifbdev;
 513         int ret;
 514
 515         if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
 516                 return -ENODEV;
 517
 518         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 519         if (ifbdev == NULL)
 520                 return -ENOMEM;
 521
 522         mutex_init(&ifbdev->hpd_lock);
 523         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 524
 525         if (!intel_fbdev_init_bios(dev, ifbdev))
 526                 ifbdev->preferred_bpp = 32;
 527
 528         ret = drm_fb_helper_init(dev, &ifbdev->helper);
 529         if (ret) {
 530                 kfree(ifbdev);
 531                 return ret;
 532         }
 533
 534         dev_priv->display.fbdev.fbdev = ifbdev;
 535         INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
 536
 537         return 0;
 538 }
 539
 540 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 541 {
 542         struct intel_fbdev *ifbdev = data;
 543
 544         /* Due to peculiar init order wrt to hpd handling this is separate. */
 545         if (drm_fb_helper_initial_config(&ifbdev->helper,
 546                                          ifbdev->preferred_bpp))
 547                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 548 }
 549
 550 void intel_fbdev_initial_config_async(struct drm_device *dev)
 551 {
 552         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 553
 554         if (!ifbdev)
 555                 return;
 556
 557         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 558 }
 559
 560 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 561 {
 562         if (!ifbdev->cookie)
 563                 return;
 564
 565         /* Only serialises with all preceding async calls, hence +1 */
 566         async_synchronize_cookie(ifbdev->cookie + 1);
 567         ifbdev->cookie = 0;
 568 }
 569
 570 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 571 {
 572         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 573
 574         if (!ifbdev)
 575                 return;
 576
 577         intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
 578
 579         if (!current_is_async())
 580                 intel_fbdev_sync(ifbdev);
 581
 582         drm_fb_helper_unregister_info(&ifbdev->helper);
 583 }
 584
 585 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 586 {
 587         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
 588
 589         if (!ifbdev)
 590                 return;
 591
 592         intel_fbdev_destroy(ifbdev);
 593 }
 594
 595 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 596  * processing, fbdev will perform a full connector reprobe if a hotplug event
 597  * was received while HPD was suspended.
 598  */
 599 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 600 {
 601         struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 602         bool send_hpd = false;
 603
 604         mutex_lock(&ifbdev->hpd_lock);
 605         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 606         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 607         ifbdev->hpd_waiting = false;
 608         mutex_unlock(&ifbdev->hpd_lock);
 609
 610         if (send_hpd) {
 611                 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
 612                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 613         }
 614 }
 615
 616 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 617 {
 618         struct drm_i915_private *dev_priv = to_i915(dev);
 619         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 620         struct fb_info *info;
 621
 622         if (!ifbdev || !ifbdev->vma)
 623                 goto set_suspend;
 624
 625         info = ifbdev->helper.info;
 626
 627         if (synchronous) {
 628                 /* Flush any pending work to turn the console on, and then
 629                  * wait to turn it off. It must be synchronous as we are
 630                  * about to suspend or unload the driver.
 631                  *
 632                  * Note that from within the work-handler, we cannot flush
 633                  * ourselves, so only flush outstanding work upon suspend!
 634                  */
 635                 if (state != FBINFO_STATE_RUNNING)
 636                         flush_work(&dev_priv->display.fbdev.suspend_work);
 637
 638                 console_lock();
 639         } else {
 640                 /*
 641                  * The console lock can be pretty contented on resume due
 642                  * to all the printk activity.  Try to keep it out of the hot
 643                  * path of resume if possible.
 644                  */
 645                 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
 646                 if (!console_trylock()) {
 647                         /* Don't block our own workqueue as this can
 648                          * be run in parallel with other i915.ko tasks.
 649                          */
 650                         schedule_work(&dev_priv->display.fbdev.suspend_work);
 651                         return;
 652                 }
 653         }
 654
 655         /* On resume from hibernation: If the object is shmemfs backed, it has
 656          * been restored from swap. If the object is stolen however, it will be
 657          * full of whatever garbage was left in there.
 658          */
 659         if (state == FBINFO_STATE_RUNNING &&
 660             !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 661                 memset_io(info->screen_base, 0, info->screen_size);
 662
 663         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 664         console_unlock();
 665
 666 set_suspend:
 667         intel_fbdev_hpd_set_suspend(dev_priv, state);
 668 }
 669
 670 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 671 {
 672         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 673         bool send_hpd;
 674
 675         if (!ifbdev)
 676                 return;
 677
 678         intel_fbdev_sync(ifbdev);
 679
 680         mutex_lock(&ifbdev->hpd_lock);
 681         send_hpd = !ifbdev->hpd_suspended;
 682         ifbdev->hpd_waiting = true;
 683         mutex_unlock(&ifbdev->hpd_lock);
 684
 685         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 686                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 687 }
 688
 689 void intel_fbdev_restore_mode(struct drm_device *dev)
 690 {
 691         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 692
 693         if (!ifbdev)
 694                 return;
 695
 696         intel_fbdev_sync(ifbdev);
 697         if (!ifbdev->vma)
 698                 return;
 699
 700         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 701                 intel_fbdev_invalidate(ifbdev);
 702 }
 703
 704 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 705 {
 706         if (!fbdev || !fbdev->helper.fb)
 707                 return NULL;
 708
 709         return to_intel_framebuffer(fbdev->helper.fb);
 710 }