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 "i915_drv.h"
45 #include "intel_display_types.h"
46 #include "intel_fbdev.h"
47 #include "intel_frontbuffer.h"
48 
49 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
50 {
51 	return ifbdev->fb->frontbuffer;
52 }
53 
54 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
55 {
56 	intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
57 }
58 
59 static int intel_fbdev_set_par(struct fb_info *info)
60 {
61 	struct drm_fb_helper *fb_helper = info->par;
62 	struct intel_fbdev *ifbdev =
63 		container_of(fb_helper, struct intel_fbdev, helper);
64 	int ret;
65 
66 	ret = drm_fb_helper_set_par(info);
67 	if (ret == 0)
68 		intel_fbdev_invalidate(ifbdev);
69 
70 	return ret;
71 }
72 
73 static int intel_fbdev_blank(int blank, struct fb_info *info)
74 {
75 	struct drm_fb_helper *fb_helper = info->par;
76 	struct intel_fbdev *ifbdev =
77 		container_of(fb_helper, struct intel_fbdev, helper);
78 	int ret;
79 
80 	ret = drm_fb_helper_blank(blank, info);
81 	if (ret == 0)
82 		intel_fbdev_invalidate(ifbdev);
83 
84 	return ret;
85 }
86 
87 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
88 				   struct fb_info *info)
89 {
90 	struct drm_fb_helper *fb_helper = info->par;
91 	struct intel_fbdev *ifbdev =
92 		container_of(fb_helper, struct intel_fbdev, helper);
93 	int ret;
94 
95 	ret = drm_fb_helper_pan_display(var, info);
96 	if (ret == 0)
97 		intel_fbdev_invalidate(ifbdev);
98 
99 	return ret;
100 }
101 
102 static const struct fb_ops intelfb_ops = {
103 	.owner = THIS_MODULE,
104 	DRM_FB_HELPER_DEFAULT_OPS,
105 	.fb_set_par = intel_fbdev_set_par,
106 	.fb_fillrect = drm_fb_helper_cfb_fillrect,
107 	.fb_copyarea = drm_fb_helper_cfb_copyarea,
108 	.fb_imageblit = drm_fb_helper_cfb_imageblit,
109 	.fb_pan_display = intel_fbdev_pan_display,
110 	.fb_blank = intel_fbdev_blank,
111 };
112 
113 static int intelfb_alloc(struct drm_fb_helper *helper,
114 			 struct drm_fb_helper_surface_size *sizes)
115 {
116 	struct intel_fbdev *ifbdev =
117 		container_of(helper, struct intel_fbdev, helper);
118 	struct drm_framebuffer *fb;
119 	struct drm_device *dev = helper->dev;
120 	struct drm_i915_private *dev_priv = to_i915(dev);
121 	struct drm_mode_fb_cmd2 mode_cmd = {};
122 	struct drm_i915_gem_object *obj;
123 	int size;
124 
125 	/* we don't do packed 24bpp */
126 	if (sizes->surface_bpp == 24)
127 		sizes->surface_bpp = 32;
128 
129 	mode_cmd.width = sizes->surface_width;
130 	mode_cmd.height = sizes->surface_height;
131 
132 	mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
133 				    DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
134 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
135 							  sizes->surface_depth);
136 
137 	size = mode_cmd.pitches[0] * mode_cmd.height;
138 	size = PAGE_ALIGN(size);
139 
140 	/* If the FB is too big, just don't use it since fbdev is not very
141 	 * important and we should probably use that space with FBC or other
142 	 * features. */
143 	obj = ERR_PTR(-ENODEV);
144 	if (size * 2 < dev_priv->stolen_usable_size)
145 		obj = i915_gem_object_create_stolen(dev_priv, size);
146 	if (IS_ERR(obj))
147 		obj = i915_gem_object_create_shmem(dev_priv, size);
148 	if (IS_ERR(obj)) {
149 		drm_err(&dev_priv->drm, "failed to allocate framebuffer\n");
150 		return PTR_ERR(obj);
151 	}
152 
153 	fb = intel_framebuffer_create(obj, &mode_cmd);
154 	i915_gem_object_put(obj);
155 	if (IS_ERR(fb))
156 		return PTR_ERR(fb);
157 
158 	ifbdev->fb = to_intel_framebuffer(fb);
159 	return 0;
160 }
161 
162 static int intelfb_create(struct drm_fb_helper *helper,
163 			  struct drm_fb_helper_surface_size *sizes)
164 {
165 	struct intel_fbdev *ifbdev =
166 		container_of(helper, struct intel_fbdev, helper);
167 	struct intel_framebuffer *intel_fb = ifbdev->fb;
168 	struct drm_device *dev = helper->dev;
169 	struct drm_i915_private *dev_priv = to_i915(dev);
170 	struct pci_dev *pdev = dev_priv->drm.pdev;
171 	struct i915_ggtt *ggtt = &dev_priv->ggtt;
172 	const struct i915_ggtt_view view = {
173 		.type = I915_GGTT_VIEW_NORMAL,
174 	};
175 	intel_wakeref_t wakeref;
176 	struct fb_info *info;
177 	struct i915_vma *vma;
178 	unsigned long flags = 0;
179 	bool prealloc = false;
180 	void __iomem *vaddr;
181 	int ret;
182 
183 	if (intel_fb &&
184 	    (sizes->fb_width > intel_fb->base.width ||
185 	     sizes->fb_height > intel_fb->base.height)) {
186 		drm_dbg_kms(&dev_priv->drm,
187 			    "BIOS fb too small (%dx%d), we require (%dx%d),"
188 			    " releasing it\n",
189 			    intel_fb->base.width, intel_fb->base.height,
190 			    sizes->fb_width, sizes->fb_height);
191 		drm_framebuffer_put(&intel_fb->base);
192 		intel_fb = ifbdev->fb = NULL;
193 	}
194 	if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
195 		drm_dbg_kms(&dev_priv->drm,
196 			    "no BIOS fb, allocating a new one\n");
197 		ret = intelfb_alloc(helper, sizes);
198 		if (ret)
199 			return ret;
200 		intel_fb = ifbdev->fb;
201 	} else {
202 		drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
203 		prealloc = true;
204 		sizes->fb_width = intel_fb->base.width;
205 		sizes->fb_height = intel_fb->base.height;
206 	}
207 
208 	wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
209 
210 	/* Pin the GGTT vma for our access via info->screen_base.
211 	 * This also validates that any existing fb inherited from the
212 	 * BIOS is suitable for own access.
213 	 */
214 	vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base,
215 					 &view, false, &flags);
216 	if (IS_ERR(vma)) {
217 		ret = PTR_ERR(vma);
218 		goto out_unlock;
219 	}
220 
221 	intel_frontbuffer_flush(to_frontbuffer(ifbdev), ORIGIN_DIRTYFB);
222 
223 	info = drm_fb_helper_alloc_fbi(helper);
224 	if (IS_ERR(info)) {
225 		drm_err(&dev_priv->drm, "Failed to allocate fb_info\n");
226 		ret = PTR_ERR(info);
227 		goto out_unpin;
228 	}
229 
230 	ifbdev->helper.fb = &ifbdev->fb->base;
231 
232 	info->fbops = &intelfb_ops;
233 
234 	/* setup aperture base/size for vesafb takeover */
235 	info->apertures->ranges[0].base = ggtt->gmadr.start;
236 	info->apertures->ranges[0].size = ggtt->mappable_end;
237 
238 	/* Our framebuffer is the entirety of fbdev's system memory */
239 	info->fix.smem_start =
240 		(unsigned long)(ggtt->gmadr.start + vma->node.start);
241 	info->fix.smem_len = vma->node.size;
242 
243 	vaddr = i915_vma_pin_iomap(vma);
244 	if (IS_ERR(vaddr)) {
245 		drm_err(&dev_priv->drm,
246 			"Failed to remap framebuffer into virtual memory\n");
247 		ret = PTR_ERR(vaddr);
248 		goto out_unpin;
249 	}
250 	info->screen_base = vaddr;
251 	info->screen_size = vma->node.size;
252 
253 	drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
254 
255 	/* If the object is shmemfs backed, it will have given us zeroed pages.
256 	 * If the object is stolen however, it will be full of whatever
257 	 * garbage was left in there.
258 	 */
259 	if (vma->obj->stolen && !prealloc)
260 		memset_io(info->screen_base, 0, info->screen_size);
261 
262 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
263 
264 	drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
265 		    ifbdev->fb->base.width, ifbdev->fb->base.height,
266 		    i915_ggtt_offset(vma));
267 	ifbdev->vma = vma;
268 	ifbdev->vma_flags = flags;
269 
270 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
271 	vga_switcheroo_client_fb_set(pdev, info);
272 	return 0;
273 
274 out_unpin:
275 	intel_unpin_fb_vma(vma, flags);
276 out_unlock:
277 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
278 	return ret;
279 }
280 
281 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
282 	.fb_probe = intelfb_create,
283 };
284 
285 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
286 {
287 	/* We rely on the object-free to release the VMA pinning for
288 	 * the info->screen_base mmaping. Leaking the VMA is simpler than
289 	 * trying to rectify all the possible error paths leading here.
290 	 */
291 
292 	drm_fb_helper_fini(&ifbdev->helper);
293 
294 	if (ifbdev->vma)
295 		intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
296 
297 	if (ifbdev->fb)
298 		drm_framebuffer_remove(&ifbdev->fb->base);
299 
300 	kfree(ifbdev);
301 }
302 
303 /*
304  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
305  * The core display code will have read out the current plane configuration,
306  * so we use that to figure out if there's an object for us to use as the
307  * fb, and if so, we re-use it for the fbdev configuration.
308  *
309  * Note we only support a single fb shared across pipes for boot (mostly for
310  * fbcon), so we just find the biggest and use that.
311  */
312 static bool intel_fbdev_init_bios(struct drm_device *dev,
313 				 struct intel_fbdev *ifbdev)
314 {
315 	struct drm_i915_private *i915 = to_i915(dev);
316 	struct intel_framebuffer *fb = NULL;
317 	struct drm_crtc *crtc;
318 	struct intel_crtc *intel_crtc;
319 	unsigned int max_size = 0;
320 
321 	/* Find the largest fb */
322 	for_each_crtc(dev, crtc) {
323 		struct drm_i915_gem_object *obj =
324 			intel_fb_obj(crtc->primary->state->fb);
325 		intel_crtc = to_intel_crtc(crtc);
326 
327 		if (!crtc->state->active || !obj) {
328 			drm_dbg_kms(&i915->drm,
329 				    "pipe %c not active or no fb, skipping\n",
330 				    pipe_name(intel_crtc->pipe));
331 			continue;
332 		}
333 
334 		if (obj->base.size > max_size) {
335 			drm_dbg_kms(&i915->drm,
336 				    "found possible fb from plane %c\n",
337 				    pipe_name(intel_crtc->pipe));
338 			fb = to_intel_framebuffer(crtc->primary->state->fb);
339 			max_size = obj->base.size;
340 		}
341 	}
342 
343 	if (!fb) {
344 		drm_dbg_kms(&i915->drm,
345 			    "no active fbs found, not using BIOS config\n");
346 		goto out;
347 	}
348 
349 	/* Now make sure all the pipes will fit into it */
350 	for_each_crtc(dev, crtc) {
351 		unsigned int cur_size;
352 
353 		intel_crtc = to_intel_crtc(crtc);
354 
355 		if (!crtc->state->active) {
356 			drm_dbg_kms(&i915->drm,
357 				    "pipe %c not active, skipping\n",
358 				    pipe_name(intel_crtc->pipe));
359 			continue;
360 		}
361 
362 		drm_dbg_kms(&i915->drm, "checking plane %c for BIOS fb\n",
363 			    pipe_name(intel_crtc->pipe));
364 
365 		/*
366 		 * See if the plane fb we found above will fit on this
367 		 * pipe.  Note we need to use the selected fb's pitch and bpp
368 		 * rather than the current pipe's, since they differ.
369 		 */
370 		cur_size = crtc->state->adjusted_mode.crtc_hdisplay;
371 		cur_size = cur_size * fb->base.format->cpp[0];
372 		if (fb->base.pitches[0] < cur_size) {
373 			drm_dbg_kms(&i915->drm,
374 				    "fb not wide enough for plane %c (%d vs %d)\n",
375 				    pipe_name(intel_crtc->pipe),
376 				    cur_size, fb->base.pitches[0]);
377 			fb = NULL;
378 			break;
379 		}
380 
381 		cur_size = crtc->state->adjusted_mode.crtc_vdisplay;
382 		cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
383 		cur_size *= fb->base.pitches[0];
384 		drm_dbg_kms(&i915->drm,
385 			    "pipe %c area: %dx%d, bpp: %d, size: %d\n",
386 			    pipe_name(intel_crtc->pipe),
387 			    crtc->state->adjusted_mode.crtc_hdisplay,
388 			    crtc->state->adjusted_mode.crtc_vdisplay,
389 			    fb->base.format->cpp[0] * 8,
390 			    cur_size);
391 
392 		if (cur_size > max_size) {
393 			drm_dbg_kms(&i915->drm,
394 				    "fb not big enough for plane %c (%d vs %d)\n",
395 				    pipe_name(intel_crtc->pipe),
396 				    cur_size, max_size);
397 			fb = NULL;
398 			break;
399 		}
400 
401 		drm_dbg_kms(&i915->drm,
402 			    "fb big enough for plane %c (%d >= %d)\n",
403 			    pipe_name(intel_crtc->pipe),
404 			    max_size, cur_size);
405 	}
406 
407 	if (!fb) {
408 		drm_dbg_kms(&i915->drm,
409 			    "BIOS fb not suitable for all pipes, not using\n");
410 		goto out;
411 	}
412 
413 	ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
414 	ifbdev->fb = fb;
415 
416 	drm_framebuffer_get(&ifbdev->fb->base);
417 
418 	/* Final pass to check if any active pipes don't have fbs */
419 	for_each_crtc(dev, crtc) {
420 		intel_crtc = to_intel_crtc(crtc);
421 
422 		if (!crtc->state->active)
423 			continue;
424 
425 		drm_WARN(dev, !crtc->primary->state->fb,
426 			 "re-used BIOS config but lost an fb on crtc %d\n",
427 			 crtc->base.id);
428 	}
429 
430 
431 	drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
432 	return true;
433 
434 out:
435 
436 	return false;
437 }
438 
439 static void intel_fbdev_suspend_worker(struct work_struct *work)
440 {
441 	intel_fbdev_set_suspend(&container_of(work,
442 					      struct drm_i915_private,
443 					      fbdev_suspend_work)->drm,
444 				FBINFO_STATE_RUNNING,
445 				true);
446 }
447 
448 int intel_fbdev_init(struct drm_device *dev)
449 {
450 	struct drm_i915_private *dev_priv = to_i915(dev);
451 	struct intel_fbdev *ifbdev;
452 	int ret;
453 
454 	if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
455 		return -ENODEV;
456 
457 	ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
458 	if (ifbdev == NULL)
459 		return -ENOMEM;
460 
461 	mutex_init(&ifbdev->hpd_lock);
462 	drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
463 
464 	if (!intel_fbdev_init_bios(dev, ifbdev))
465 		ifbdev->preferred_bpp = 32;
466 
467 	ret = drm_fb_helper_init(dev, &ifbdev->helper);
468 	if (ret) {
469 		kfree(ifbdev);
470 		return ret;
471 	}
472 
473 	dev_priv->fbdev = ifbdev;
474 	INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
475 
476 	return 0;
477 }
478 
479 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
480 {
481 	struct intel_fbdev *ifbdev = data;
482 
483 	/* Due to peculiar init order wrt to hpd handling this is separate. */
484 	if (drm_fb_helper_initial_config(&ifbdev->helper,
485 					 ifbdev->preferred_bpp))
486 		intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
487 }
488 
489 void intel_fbdev_initial_config_async(struct drm_device *dev)
490 {
491 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
492 
493 	if (!ifbdev)
494 		return;
495 
496 	ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
497 }
498 
499 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
500 {
501 	if (!ifbdev->cookie)
502 		return;
503 
504 	/* Only serialises with all preceding async calls, hence +1 */
505 	async_synchronize_cookie(ifbdev->cookie + 1);
506 	ifbdev->cookie = 0;
507 }
508 
509 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
510 {
511 	struct intel_fbdev *ifbdev = dev_priv->fbdev;
512 
513 	if (!ifbdev)
514 		return;
515 
516 	cancel_work_sync(&dev_priv->fbdev_suspend_work);
517 	if (!current_is_async())
518 		intel_fbdev_sync(ifbdev);
519 
520 	drm_fb_helper_unregister_fbi(&ifbdev->helper);
521 }
522 
523 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
524 {
525 	struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
526 
527 	if (!ifbdev)
528 		return;
529 
530 	intel_fbdev_destroy(ifbdev);
531 }
532 
533 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
534  * processing, fbdev will perform a full connector reprobe if a hotplug event
535  * was received while HPD was suspended.
536  */
537 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
538 {
539 	struct intel_fbdev *ifbdev = i915->fbdev;
540 	bool send_hpd = false;
541 
542 	mutex_lock(&ifbdev->hpd_lock);
543 	ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
544 	send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
545 	ifbdev->hpd_waiting = false;
546 	mutex_unlock(&ifbdev->hpd_lock);
547 
548 	if (send_hpd) {
549 		drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
550 		drm_fb_helper_hotplug_event(&ifbdev->helper);
551 	}
552 }
553 
554 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
555 {
556 	struct drm_i915_private *dev_priv = to_i915(dev);
557 	struct intel_fbdev *ifbdev = dev_priv->fbdev;
558 	struct fb_info *info;
559 
560 	if (!ifbdev || !ifbdev->vma)
561 		return;
562 
563 	info = ifbdev->helper.fbdev;
564 
565 	if (synchronous) {
566 		/* Flush any pending work to turn the console on, and then
567 		 * wait to turn it off. It must be synchronous as we are
568 		 * about to suspend or unload the driver.
569 		 *
570 		 * Note that from within the work-handler, we cannot flush
571 		 * ourselves, so only flush outstanding work upon suspend!
572 		 */
573 		if (state != FBINFO_STATE_RUNNING)
574 			flush_work(&dev_priv->fbdev_suspend_work);
575 
576 		console_lock();
577 	} else {
578 		/*
579 		 * The console lock can be pretty contented on resume due
580 		 * to all the printk activity.  Try to keep it out of the hot
581 		 * path of resume if possible.
582 		 */
583 		drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
584 		if (!console_trylock()) {
585 			/* Don't block our own workqueue as this can
586 			 * be run in parallel with other i915.ko tasks.
587 			 */
588 			schedule_work(&dev_priv->fbdev_suspend_work);
589 			return;
590 		}
591 	}
592 
593 	/* On resume from hibernation: If the object is shmemfs backed, it has
594 	 * been restored from swap. If the object is stolen however, it will be
595 	 * full of whatever garbage was left in there.
596 	 */
597 	if (state == FBINFO_STATE_RUNNING &&
598 	    intel_fb_obj(&ifbdev->fb->base)->stolen)
599 		memset_io(info->screen_base, 0, info->screen_size);
600 
601 	drm_fb_helper_set_suspend(&ifbdev->helper, state);
602 	console_unlock();
603 
604 	intel_fbdev_hpd_set_suspend(dev_priv, state);
605 }
606 
607 void intel_fbdev_output_poll_changed(struct drm_device *dev)
608 {
609 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
610 	bool send_hpd;
611 
612 	if (!ifbdev)
613 		return;
614 
615 	intel_fbdev_sync(ifbdev);
616 
617 	mutex_lock(&ifbdev->hpd_lock);
618 	send_hpd = !ifbdev->hpd_suspended;
619 	ifbdev->hpd_waiting = true;
620 	mutex_unlock(&ifbdev->hpd_lock);
621 
622 	if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
623 		drm_fb_helper_hotplug_event(&ifbdev->helper);
624 }
625 
626 void intel_fbdev_restore_mode(struct drm_device *dev)
627 {
628 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
629 
630 	if (!ifbdev)
631 		return;
632 
633 	intel_fbdev_sync(ifbdev);
634 	if (!ifbdev->vma)
635 		return;
636 
637 	if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
638 		intel_fbdev_invalidate(ifbdev);
639 }
640