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 /* setup aperture base/size for vesafb takeover */ 271 obj = intel_fb_obj(&intel_fb->base); 272 if (i915_gem_object_is_lmem(obj)) { 273 struct intel_memory_region *mem = obj->mm.region; 274 275 info->apertures->ranges[0].base = mem->io_start; 276 info->apertures->ranges[0].size = mem->io_size; 277 278 /* Use fbdev's framebuffer from lmem for discrete */ 279 info->fix.smem_start = 280 (unsigned long)(mem->io_start + 281 i915_gem_object_get_dma_address(obj, 0)); 282 info->fix.smem_len = obj->base.size; 283 } else { 284 info->apertures->ranges[0].base = ggtt->gmadr.start; 285 info->apertures->ranges[0].size = ggtt->mappable_end; 286 287 /* Our framebuffer is the entirety of fbdev's system memory */ 288 info->fix.smem_start = 289 (unsigned long)(ggtt->gmadr.start + vma->node.start); 290 info->fix.smem_len = vma->size; 291 } 292 293 vaddr = i915_vma_pin_iomap(vma); 294 if (IS_ERR(vaddr)) { 295 drm_err(&dev_priv->drm, 296 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr); 297 ret = PTR_ERR(vaddr); 298 goto out_unpin; 299 } 300 info->screen_base = vaddr; 301 info->screen_size = vma->size; 302 303 drm_fb_helper_fill_info(info, &ifbdev->helper, sizes); 304 305 /* If the object is shmemfs backed, it will have given us zeroed pages. 306 * If the object is stolen however, it will be full of whatever 307 * garbage was left in there. 308 */ 309 if (!i915_gem_object_is_shmem(vma->obj) && !prealloc) 310 memset_io(info->screen_base, 0, info->screen_size); 311 312 /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */ 313 314 drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n", 315 ifbdev->fb->base.width, ifbdev->fb->base.height, 316 i915_ggtt_offset(vma)); 317 ifbdev->vma = vma; 318 ifbdev->vma_flags = flags; 319 320 intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref); 321 vga_switcheroo_client_fb_set(pdev, info); 322 return 0; 323 324 out_unpin: 325 intel_unpin_fb_vma(vma, flags); 326 out_unlock: 327 intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref); 328 return ret; 329 } 330 331 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = { 332 .fb_probe = intelfb_create, 333 }; 334 335 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev) 336 { 337 /* We rely on the object-free to release the VMA pinning for 338 * the info->screen_base mmaping. Leaking the VMA is simpler than 339 * trying to rectify all the possible error paths leading here. 340 */ 341 342 drm_fb_helper_fini(&ifbdev->helper); 343 344 if (ifbdev->vma) 345 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags); 346 347 if (ifbdev->fb) 348 drm_framebuffer_remove(&ifbdev->fb->base); 349 350 kfree(ifbdev); 351 } 352 353 /* 354 * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible. 355 * The core display code will have read out the current plane configuration, 356 * so we use that to figure out if there's an object for us to use as the 357 * fb, and if so, we re-use it for the fbdev configuration. 358 * 359 * Note we only support a single fb shared across pipes for boot (mostly for 360 * fbcon), so we just find the biggest and use that. 361 */ 362 static bool intel_fbdev_init_bios(struct drm_device *dev, 363 struct intel_fbdev *ifbdev) 364 { 365 struct drm_i915_private *i915 = to_i915(dev); 366 struct intel_framebuffer *fb = NULL; 367 struct intel_crtc *crtc; 368 unsigned int max_size = 0; 369 370 /* Find the largest fb */ 371 for_each_intel_crtc(dev, crtc) { 372 struct intel_crtc_state *crtc_state = 373 to_intel_crtc_state(crtc->base.state); 374 struct intel_plane *plane = 375 to_intel_plane(crtc->base.primary); 376 struct intel_plane_state *plane_state = 377 to_intel_plane_state(plane->base.state); 378 struct drm_i915_gem_object *obj = 379 intel_fb_obj(plane_state->uapi.fb); 380 381 if (!crtc_state->uapi.active) { 382 drm_dbg_kms(&i915->drm, 383 "[CRTC:%d:%s] not active, skipping\n", 384 crtc->base.base.id, crtc->base.name); 385 continue; 386 } 387 388 if (!obj) { 389 drm_dbg_kms(&i915->drm, 390 "[PLANE:%d:%s] no fb, skipping\n", 391 plane->base.base.id, plane->base.name); 392 continue; 393 } 394 395 if (obj->base.size > max_size) { 396 drm_dbg_kms(&i915->drm, 397 "found possible fb from [PLANE:%d:%s]\n", 398 plane->base.base.id, plane->base.name); 399 fb = to_intel_framebuffer(plane_state->uapi.fb); 400 max_size = obj->base.size; 401 } 402 } 403 404 if (!fb) { 405 drm_dbg_kms(&i915->drm, 406 "no active fbs found, not using BIOS config\n"); 407 goto out; 408 } 409 410 /* Now make sure all the pipes will fit into it */ 411 for_each_intel_crtc(dev, crtc) { 412 struct intel_crtc_state *crtc_state = 413 to_intel_crtc_state(crtc->base.state); 414 struct intel_plane *plane = 415 to_intel_plane(crtc->base.primary); 416 unsigned int cur_size; 417 418 if (!crtc_state->uapi.active) { 419 drm_dbg_kms(&i915->drm, 420 "[CRTC:%d:%s] not active, skipping\n", 421 crtc->base.base.id, crtc->base.name); 422 continue; 423 } 424 425 drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n", 426 plane->base.base.id, plane->base.name); 427 428 /* 429 * See if the plane fb we found above will fit on this 430 * pipe. Note we need to use the selected fb's pitch and bpp 431 * rather than the current pipe's, since they differ. 432 */ 433 cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay; 434 cur_size = cur_size * fb->base.format->cpp[0]; 435 if (fb->base.pitches[0] < cur_size) { 436 drm_dbg_kms(&i915->drm, 437 "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n", 438 plane->base.base.id, plane->base.name, 439 cur_size, fb->base.pitches[0]); 440 fb = NULL; 441 break; 442 } 443 444 cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay; 445 cur_size = intel_fb_align_height(&fb->base, 0, cur_size); 446 cur_size *= fb->base.pitches[0]; 447 drm_dbg_kms(&i915->drm, 448 "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n", 449 crtc->base.base.id, crtc->base.name, 450 crtc_state->uapi.adjusted_mode.crtc_hdisplay, 451 crtc_state->uapi.adjusted_mode.crtc_vdisplay, 452 fb->base.format->cpp[0] * 8, 453 cur_size); 454 455 if (cur_size > max_size) { 456 drm_dbg_kms(&i915->drm, 457 "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n", 458 plane->base.base.id, plane->base.name, 459 cur_size, max_size); 460 fb = NULL; 461 break; 462 } 463 464 drm_dbg_kms(&i915->drm, 465 "fb big enough [PLANE:%d:%s] (%d >= %d)\n", 466 plane->base.base.id, plane->base.name, 467 max_size, cur_size); 468 } 469 470 if (!fb) { 471 drm_dbg_kms(&i915->drm, 472 "BIOS fb not suitable for all pipes, not using\n"); 473 goto out; 474 } 475 476 ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8; 477 ifbdev->fb = fb; 478 479 drm_framebuffer_get(&ifbdev->fb->base); 480 481 /* Final pass to check if any active pipes don't have fbs */ 482 for_each_intel_crtc(dev, crtc) { 483 struct intel_crtc_state *crtc_state = 484 to_intel_crtc_state(crtc->base.state); 485 struct intel_plane *plane = 486 to_intel_plane(crtc->base.primary); 487 struct intel_plane_state *plane_state = 488 to_intel_plane_state(plane->base.state); 489 490 if (!crtc_state->uapi.active) 491 continue; 492 493 drm_WARN(dev, !plane_state->uapi.fb, 494 "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n", 495 plane->base.base.id, plane->base.name); 496 } 497 498 499 drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n"); 500 return true; 501 502 out: 503 504 return false; 505 } 506 507 static void intel_fbdev_suspend_worker(struct work_struct *work) 508 { 509 intel_fbdev_set_suspend(&container_of(work, 510 struct drm_i915_private, 511 display.fbdev.suspend_work)->drm, 512 FBINFO_STATE_RUNNING, 513 true); 514 } 515 516 int intel_fbdev_init(struct drm_device *dev) 517 { 518 struct drm_i915_private *dev_priv = to_i915(dev); 519 struct intel_fbdev *ifbdev; 520 int ret; 521 522 if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv))) 523 return -ENODEV; 524 525 ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL); 526 if (ifbdev == NULL) 527 return -ENOMEM; 528 529 mutex_init(&ifbdev->hpd_lock); 530 drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs); 531 532 if (!intel_fbdev_init_bios(dev, ifbdev)) 533 ifbdev->preferred_bpp = 32; 534 535 ret = drm_fb_helper_init(dev, &ifbdev->helper); 536 if (ret) { 537 kfree(ifbdev); 538 return ret; 539 } 540 541 dev_priv->display.fbdev.fbdev = ifbdev; 542 INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker); 543 544 return 0; 545 } 546 547 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie) 548 { 549 struct intel_fbdev *ifbdev = data; 550 551 /* Due to peculiar init order wrt to hpd handling this is separate. */ 552 if (drm_fb_helper_initial_config(&ifbdev->helper, 553 ifbdev->preferred_bpp)) 554 intel_fbdev_unregister(to_i915(ifbdev->helper.dev)); 555 } 556 557 void intel_fbdev_initial_config_async(struct drm_device *dev) 558 { 559 struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev; 560 561 if (!ifbdev) 562 return; 563 564 ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev); 565 } 566 567 static void intel_fbdev_sync(struct intel_fbdev *ifbdev) 568 { 569 if (!ifbdev->cookie) 570 return; 571 572 /* Only serialises with all preceding async calls, hence +1 */ 573 async_synchronize_cookie(ifbdev->cookie + 1); 574 ifbdev->cookie = 0; 575 } 576 577 void intel_fbdev_unregister(struct drm_i915_private *dev_priv) 578 { 579 struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev; 580 581 if (!ifbdev) 582 return; 583 584 intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true); 585 586 if (!current_is_async()) 587 intel_fbdev_sync(ifbdev); 588 589 drm_fb_helper_unregister_info(&ifbdev->helper); 590 } 591 592 void intel_fbdev_fini(struct drm_i915_private *dev_priv) 593 { 594 struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev); 595 596 if (!ifbdev) 597 return; 598 599 intel_fbdev_destroy(ifbdev); 600 } 601 602 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD 603 * processing, fbdev will perform a full connector reprobe if a hotplug event 604 * was received while HPD was suspended. 605 */ 606 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state) 607 { 608 struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev; 609 bool send_hpd = false; 610 611 mutex_lock(&ifbdev->hpd_lock); 612 ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED; 613 send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting; 614 ifbdev->hpd_waiting = false; 615 mutex_unlock(&ifbdev->hpd_lock); 616 617 if (send_hpd) { 618 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n"); 619 drm_fb_helper_hotplug_event(&ifbdev->helper); 620 } 621 } 622 623 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous) 624 { 625 struct drm_i915_private *dev_priv = to_i915(dev); 626 struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev; 627 struct fb_info *info; 628 629 if (!ifbdev || !ifbdev->vma) 630 goto set_suspend; 631 632 info = ifbdev->helper.info; 633 634 if (synchronous) { 635 /* Flush any pending work to turn the console on, and then 636 * wait to turn it off. It must be synchronous as we are 637 * about to suspend or unload the driver. 638 * 639 * Note that from within the work-handler, we cannot flush 640 * ourselves, so only flush outstanding work upon suspend! 641 */ 642 if (state != FBINFO_STATE_RUNNING) 643 flush_work(&dev_priv->display.fbdev.suspend_work); 644 645 console_lock(); 646 } else { 647 /* 648 * The console lock can be pretty contented on resume due 649 * to all the printk activity. Try to keep it out of the hot 650 * path of resume if possible. 651 */ 652 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING); 653 if (!console_trylock()) { 654 /* Don't block our own workqueue as this can 655 * be run in parallel with other i915.ko tasks. 656 */ 657 schedule_work(&dev_priv->display.fbdev.suspend_work); 658 return; 659 } 660 } 661 662 /* On resume from hibernation: If the object is shmemfs backed, it has 663 * been restored from swap. If the object is stolen however, it will be 664 * full of whatever garbage was left in there. 665 */ 666 if (state == FBINFO_STATE_RUNNING && 667 !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base))) 668 memset_io(info->screen_base, 0, info->screen_size); 669 670 drm_fb_helper_set_suspend(&ifbdev->helper, state); 671 console_unlock(); 672 673 set_suspend: 674 intel_fbdev_hpd_set_suspend(dev_priv, state); 675 } 676 677 void intel_fbdev_output_poll_changed(struct drm_device *dev) 678 { 679 struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev; 680 bool send_hpd; 681 682 if (!ifbdev) 683 return; 684 685 intel_fbdev_sync(ifbdev); 686 687 mutex_lock(&ifbdev->hpd_lock); 688 send_hpd = !ifbdev->hpd_suspended; 689 ifbdev->hpd_waiting = true; 690 mutex_unlock(&ifbdev->hpd_lock); 691 692 if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup)) 693 drm_fb_helper_hotplug_event(&ifbdev->helper); 694 } 695 696 void intel_fbdev_restore_mode(struct drm_device *dev) 697 { 698 struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev; 699 700 if (!ifbdev) 701 return; 702 703 intel_fbdev_sync(ifbdev); 704 if (!ifbdev->vma) 705 return; 706 707 if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0) 708 intel_fbdev_invalidate(ifbdev); 709 } 710 711 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev) 712 { 713 if (!fbdev || !fbdev->helper.fb) 714 return NULL; 715 716 return to_intel_framebuffer(fbdev->helper.fb); 717 } 718