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 #include <drm/i915_drm.h>
44 
45 #include "i915_drv.h"
46 #include "intel_display_types.h"
47 #include "intel_fbdev.h"
48 #include "intel_frontbuffer.h"
49 
50 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
51 {
52 	return ifbdev->fb->frontbuffer;
53 }
54 
55 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
56 {
57 	intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
58 }
59 
60 static int intel_fbdev_set_par(struct fb_info *info)
61 {
62 	struct drm_fb_helper *fb_helper = info->par;
63 	struct intel_fbdev *ifbdev =
64 		container_of(fb_helper, struct intel_fbdev, helper);
65 	int ret;
66 
67 	ret = drm_fb_helper_set_par(info);
68 	if (ret == 0)
69 		intel_fbdev_invalidate(ifbdev);
70 
71 	return ret;
72 }
73 
74 static int intel_fbdev_blank(int blank, struct fb_info *info)
75 {
76 	struct drm_fb_helper *fb_helper = info->par;
77 	struct intel_fbdev *ifbdev =
78 		container_of(fb_helper, struct intel_fbdev, helper);
79 	int ret;
80 
81 	ret = drm_fb_helper_blank(blank, info);
82 	if (ret == 0)
83 		intel_fbdev_invalidate(ifbdev);
84 
85 	return ret;
86 }
87 
88 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
89 				   struct fb_info *info)
90 {
91 	struct drm_fb_helper *fb_helper = info->par;
92 	struct intel_fbdev *ifbdev =
93 		container_of(fb_helper, struct intel_fbdev, helper);
94 	int ret;
95 
96 	ret = drm_fb_helper_pan_display(var, info);
97 	if (ret == 0)
98 		intel_fbdev_invalidate(ifbdev);
99 
100 	return ret;
101 }
102 
103 static struct fb_ops intelfb_ops = {
104 	.owner = THIS_MODULE,
105 	DRM_FB_HELPER_DEFAULT_OPS,
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 };
113 
114 static int intelfb_alloc(struct drm_fb_helper *helper,
115 			 struct drm_fb_helper_surface_size *sizes)
116 {
117 	struct intel_fbdev *ifbdev =
118 		container_of(helper, struct intel_fbdev, helper);
119 	struct drm_framebuffer *fb;
120 	struct drm_device *dev = helper->dev;
121 	struct drm_i915_private *dev_priv = to_i915(dev);
122 	struct drm_mode_fb_cmd2 mode_cmd = {};
123 	struct drm_i915_gem_object *obj;
124 	int size;
125 
126 	/* we don't do packed 24bpp */
127 	if (sizes->surface_bpp == 24)
128 		sizes->surface_bpp = 32;
129 
130 	mode_cmd.width = sizes->surface_width;
131 	mode_cmd.height = sizes->surface_height;
132 
133 	mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
134 				    DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
135 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
136 							  sizes->surface_depth);
137 
138 	size = mode_cmd.pitches[0] * mode_cmd.height;
139 	size = PAGE_ALIGN(size);
140 
141 	/* If the FB is too big, just don't use it since fbdev is not very
142 	 * important and we should probably use that space with FBC or other
143 	 * features. */
144 	obj = ERR_PTR(-ENODEV);
145 	if (size * 2 < dev_priv->stolen_usable_size)
146 		obj = i915_gem_object_create_stolen(dev_priv, size);
147 	if (IS_ERR(obj))
148 		obj = i915_gem_object_create_shmem(dev_priv, size);
149 	if (IS_ERR(obj)) {
150 		DRM_ERROR("failed to allocate framebuffer\n");
151 		return PTR_ERR(obj);
152 	}
153 
154 	fb = intel_framebuffer_create(obj, &mode_cmd);
155 	i915_gem_object_put(obj);
156 	if (IS_ERR(fb))
157 		return PTR_ERR(fb);
158 
159 	ifbdev->fb = to_intel_framebuffer(fb);
160 	return 0;
161 }
162 
163 static int intelfb_create(struct drm_fb_helper *helper,
164 			  struct drm_fb_helper_surface_size *sizes)
165 {
166 	struct intel_fbdev *ifbdev =
167 		container_of(helper, struct intel_fbdev, helper);
168 	struct intel_framebuffer *intel_fb = ifbdev->fb;
169 	struct drm_device *dev = helper->dev;
170 	struct drm_i915_private *dev_priv = to_i915(dev);
171 	struct pci_dev *pdev = dev_priv->drm.pdev;
172 	struct i915_ggtt *ggtt = &dev_priv->ggtt;
173 	const struct i915_ggtt_view view = {
174 		.type = I915_GGTT_VIEW_NORMAL,
175 	};
176 	intel_wakeref_t wakeref;
177 	struct fb_info *info;
178 	struct i915_vma *vma;
179 	unsigned long flags = 0;
180 	bool prealloc = false;
181 	void __iomem *vaddr;
182 	int ret;
183 
184 	if (intel_fb &&
185 	    (sizes->fb_width > intel_fb->base.width ||
186 	     sizes->fb_height > intel_fb->base.height)) {
187 		DRM_DEBUG_KMS("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 || WARN_ON(!intel_fb_obj(&intel_fb->base))) {
195 		DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
196 		ret = intelfb_alloc(helper, sizes);
197 		if (ret)
198 			return ret;
199 		intel_fb = ifbdev->fb;
200 	} else {
201 		DRM_DEBUG_KMS("re-using BIOS fb\n");
202 		prealloc = true;
203 		sizes->fb_width = intel_fb->base.width;
204 		sizes->fb_height = intel_fb->base.height;
205 	}
206 
207 	wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
208 
209 	/* Pin the GGTT vma for our access via info->screen_base.
210 	 * This also validates that any existing fb inherited from the
211 	 * BIOS is suitable for own access.
212 	 */
213 	vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base,
214 					 &view, false, &flags);
215 	if (IS_ERR(vma)) {
216 		ret = PTR_ERR(vma);
217 		goto out_unlock;
218 	}
219 
220 	intel_frontbuffer_flush(to_frontbuffer(ifbdev), ORIGIN_DIRTYFB);
221 
222 	info = drm_fb_helper_alloc_fbi(helper);
223 	if (IS_ERR(info)) {
224 		DRM_ERROR("Failed to allocate fb_info\n");
225 		ret = PTR_ERR(info);
226 		goto out_unpin;
227 	}
228 
229 	ifbdev->helper.fb = &ifbdev->fb->base;
230 
231 	info->fbops = &intelfb_ops;
232 
233 	/* setup aperture base/size for vesafb takeover */
234 	info->apertures->ranges[0].base = ggtt->gmadr.start;
235 	info->apertures->ranges[0].size = ggtt->mappable_end;
236 
237 	/* Our framebuffer is the entirety of fbdev's system memory */
238 	info->fix.smem_start =
239 		(unsigned long)(ggtt->gmadr.start + vma->node.start);
240 	info->fix.smem_len = vma->node.size;
241 
242 	vaddr = i915_vma_pin_iomap(vma);
243 	if (IS_ERR(vaddr)) {
244 		DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
245 		ret = PTR_ERR(vaddr);
246 		goto out_unpin;
247 	}
248 	info->screen_base = vaddr;
249 	info->screen_size = vma->node.size;
250 
251 	drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
252 
253 	/* If the object is shmemfs backed, it will have given us zeroed pages.
254 	 * If the object is stolen however, it will be full of whatever
255 	 * garbage was left in there.
256 	 */
257 	if (vma->obj->stolen && !prealloc)
258 		memset_io(info->screen_base, 0, info->screen_size);
259 
260 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
261 
262 	DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x\n",
263 		      ifbdev->fb->base.width, ifbdev->fb->base.height,
264 		      i915_ggtt_offset(vma));
265 	ifbdev->vma = vma;
266 	ifbdev->vma_flags = flags;
267 
268 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
269 	vga_switcheroo_client_fb_set(pdev, info);
270 	return 0;
271 
272 out_unpin:
273 	intel_unpin_fb_vma(vma, flags);
274 out_unlock:
275 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
276 	return ret;
277 }
278 
279 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
280 	.fb_probe = intelfb_create,
281 };
282 
283 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
284 {
285 	/* We rely on the object-free to release the VMA pinning for
286 	 * the info->screen_base mmaping. Leaking the VMA is simpler than
287 	 * trying to rectify all the possible error paths leading here.
288 	 */
289 
290 	drm_fb_helper_fini(&ifbdev->helper);
291 
292 	if (ifbdev->vma)
293 		intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
294 
295 	if (ifbdev->fb)
296 		drm_framebuffer_remove(&ifbdev->fb->base);
297 
298 	kfree(ifbdev);
299 }
300 
301 /*
302  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
303  * The core display code will have read out the current plane configuration,
304  * so we use that to figure out if there's an object for us to use as the
305  * fb, and if so, we re-use it for the fbdev configuration.
306  *
307  * Note we only support a single fb shared across pipes for boot (mostly for
308  * fbcon), so we just find the biggest and use that.
309  */
310 static bool intel_fbdev_init_bios(struct drm_device *dev,
311 				 struct intel_fbdev *ifbdev)
312 {
313 	struct intel_framebuffer *fb = NULL;
314 	struct drm_crtc *crtc;
315 	struct intel_crtc *intel_crtc;
316 	unsigned int max_size = 0;
317 
318 	/* Find the largest fb */
319 	for_each_crtc(dev, crtc) {
320 		struct drm_i915_gem_object *obj =
321 			intel_fb_obj(crtc->primary->state->fb);
322 		intel_crtc = to_intel_crtc(crtc);
323 
324 		if (!crtc->state->active || !obj) {
325 			DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
326 				      pipe_name(intel_crtc->pipe));
327 			continue;
328 		}
329 
330 		if (obj->base.size > max_size) {
331 			DRM_DEBUG_KMS("found possible fb from plane %c\n",
332 				      pipe_name(intel_crtc->pipe));
333 			fb = to_intel_framebuffer(crtc->primary->state->fb);
334 			max_size = obj->base.size;
335 		}
336 	}
337 
338 	if (!fb) {
339 		DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
340 		goto out;
341 	}
342 
343 	/* Now make sure all the pipes will fit into it */
344 	for_each_crtc(dev, crtc) {
345 		unsigned int cur_size;
346 
347 		intel_crtc = to_intel_crtc(crtc);
348 
349 		if (!crtc->state->active) {
350 			DRM_DEBUG_KMS("pipe %c not active, skipping\n",
351 				      pipe_name(intel_crtc->pipe));
352 			continue;
353 		}
354 
355 		DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
356 			      pipe_name(intel_crtc->pipe));
357 
358 		/*
359 		 * See if the plane fb we found above will fit on this
360 		 * pipe.  Note we need to use the selected fb's pitch and bpp
361 		 * rather than the current pipe's, since they differ.
362 		 */
363 		cur_size = crtc->state->adjusted_mode.crtc_hdisplay;
364 		cur_size = cur_size * fb->base.format->cpp[0];
365 		if (fb->base.pitches[0] < cur_size) {
366 			DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
367 				      pipe_name(intel_crtc->pipe),
368 				      cur_size, fb->base.pitches[0]);
369 			fb = NULL;
370 			break;
371 		}
372 
373 		cur_size = crtc->state->adjusted_mode.crtc_vdisplay;
374 		cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
375 		cur_size *= fb->base.pitches[0];
376 		DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
377 			      pipe_name(intel_crtc->pipe),
378 			      crtc->state->adjusted_mode.crtc_hdisplay,
379 			      crtc->state->adjusted_mode.crtc_vdisplay,
380 			      fb->base.format->cpp[0] * 8,
381 			      cur_size);
382 
383 		if (cur_size > max_size) {
384 			DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
385 				      pipe_name(intel_crtc->pipe),
386 				      cur_size, max_size);
387 			fb = NULL;
388 			break;
389 		}
390 
391 		DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
392 			      pipe_name(intel_crtc->pipe),
393 			      max_size, cur_size);
394 	}
395 
396 	if (!fb) {
397 		DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
398 		goto out;
399 	}
400 
401 	ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
402 	ifbdev->fb = fb;
403 
404 	drm_framebuffer_get(&ifbdev->fb->base);
405 
406 	/* Final pass to check if any active pipes don't have fbs */
407 	for_each_crtc(dev, crtc) {
408 		intel_crtc = to_intel_crtc(crtc);
409 
410 		if (!crtc->state->active)
411 			continue;
412 
413 		WARN(!crtc->primary->state->fb,
414 		     "re-used BIOS config but lost an fb on crtc %d\n",
415 		     crtc->base.id);
416 	}
417 
418 
419 	DRM_DEBUG_KMS("using BIOS fb for initial console\n");
420 	return true;
421 
422 out:
423 
424 	return false;
425 }
426 
427 static void intel_fbdev_suspend_worker(struct work_struct *work)
428 {
429 	intel_fbdev_set_suspend(&container_of(work,
430 					      struct drm_i915_private,
431 					      fbdev_suspend_work)->drm,
432 				FBINFO_STATE_RUNNING,
433 				true);
434 }
435 
436 int intel_fbdev_init(struct drm_device *dev)
437 {
438 	struct drm_i915_private *dev_priv = to_i915(dev);
439 	struct intel_fbdev *ifbdev;
440 	int ret;
441 
442 	if (WARN_ON(!HAS_DISPLAY(dev_priv) || !INTEL_DISPLAY_ENABLED(dev_priv)))
443 		return -ENODEV;
444 
445 	ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
446 	if (ifbdev == NULL)
447 		return -ENOMEM;
448 
449 	mutex_init(&ifbdev->hpd_lock);
450 	drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
451 
452 	if (!intel_fbdev_init_bios(dev, ifbdev))
453 		ifbdev->preferred_bpp = 32;
454 
455 	ret = drm_fb_helper_init(dev, &ifbdev->helper, 4);
456 	if (ret) {
457 		kfree(ifbdev);
458 		return ret;
459 	}
460 
461 	dev_priv->fbdev = ifbdev;
462 	INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
463 
464 	drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
465 
466 	return 0;
467 }
468 
469 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
470 {
471 	struct intel_fbdev *ifbdev = data;
472 
473 	/* Due to peculiar init order wrt to hpd handling this is separate. */
474 	if (drm_fb_helper_initial_config(&ifbdev->helper,
475 					 ifbdev->preferred_bpp))
476 		intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
477 }
478 
479 void intel_fbdev_initial_config_async(struct drm_device *dev)
480 {
481 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
482 
483 	if (!ifbdev)
484 		return;
485 
486 	ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
487 }
488 
489 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
490 {
491 	if (!ifbdev->cookie)
492 		return;
493 
494 	/* Only serialises with all preceding async calls, hence +1 */
495 	async_synchronize_cookie(ifbdev->cookie + 1);
496 	ifbdev->cookie = 0;
497 }
498 
499 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
500 {
501 	struct intel_fbdev *ifbdev = dev_priv->fbdev;
502 
503 	if (!ifbdev)
504 		return;
505 
506 	cancel_work_sync(&dev_priv->fbdev_suspend_work);
507 	if (!current_is_async())
508 		intel_fbdev_sync(ifbdev);
509 
510 	drm_fb_helper_unregister_fbi(&ifbdev->helper);
511 }
512 
513 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
514 {
515 	struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
516 
517 	if (!ifbdev)
518 		return;
519 
520 	intel_fbdev_destroy(ifbdev);
521 }
522 
523 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
524  * processing, fbdev will perform a full connector reprobe if a hotplug event
525  * was received while HPD was suspended.
526  */
527 static void intel_fbdev_hpd_set_suspend(struct intel_fbdev *ifbdev, int state)
528 {
529 	bool send_hpd = false;
530 
531 	mutex_lock(&ifbdev->hpd_lock);
532 	ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
533 	send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
534 	ifbdev->hpd_waiting = false;
535 	mutex_unlock(&ifbdev->hpd_lock);
536 
537 	if (send_hpd) {
538 		DRM_DEBUG_KMS("Handling delayed fbcon HPD event\n");
539 		drm_fb_helper_hotplug_event(&ifbdev->helper);
540 	}
541 }
542 
543 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
544 {
545 	struct drm_i915_private *dev_priv = to_i915(dev);
546 	struct intel_fbdev *ifbdev = dev_priv->fbdev;
547 	struct fb_info *info;
548 
549 	if (!ifbdev || !ifbdev->vma)
550 		return;
551 
552 	info = ifbdev->helper.fbdev;
553 
554 	if (synchronous) {
555 		/* Flush any pending work to turn the console on, and then
556 		 * wait to turn it off. It must be synchronous as we are
557 		 * about to suspend or unload the driver.
558 		 *
559 		 * Note that from within the work-handler, we cannot flush
560 		 * ourselves, so only flush outstanding work upon suspend!
561 		 */
562 		if (state != FBINFO_STATE_RUNNING)
563 			flush_work(&dev_priv->fbdev_suspend_work);
564 
565 		console_lock();
566 	} else {
567 		/*
568 		 * The console lock can be pretty contented on resume due
569 		 * to all the printk activity.  Try to keep it out of the hot
570 		 * path of resume if possible.
571 		 */
572 		WARN_ON(state != FBINFO_STATE_RUNNING);
573 		if (!console_trylock()) {
574 			/* Don't block our own workqueue as this can
575 			 * be run in parallel with other i915.ko tasks.
576 			 */
577 			schedule_work(&dev_priv->fbdev_suspend_work);
578 			return;
579 		}
580 	}
581 
582 	/* On resume from hibernation: If the object is shmemfs backed, it has
583 	 * been restored from swap. If the object is stolen however, it will be
584 	 * full of whatever garbage was left in there.
585 	 */
586 	if (state == FBINFO_STATE_RUNNING &&
587 	    intel_fb_obj(&ifbdev->fb->base)->stolen)
588 		memset_io(info->screen_base, 0, info->screen_size);
589 
590 	drm_fb_helper_set_suspend(&ifbdev->helper, state);
591 	console_unlock();
592 
593 	intel_fbdev_hpd_set_suspend(ifbdev, state);
594 }
595 
596 void intel_fbdev_output_poll_changed(struct drm_device *dev)
597 {
598 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
599 	bool send_hpd;
600 
601 	if (!ifbdev)
602 		return;
603 
604 	intel_fbdev_sync(ifbdev);
605 
606 	mutex_lock(&ifbdev->hpd_lock);
607 	send_hpd = !ifbdev->hpd_suspended;
608 	ifbdev->hpd_waiting = true;
609 	mutex_unlock(&ifbdev->hpd_lock);
610 
611 	if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
612 		drm_fb_helper_hotplug_event(&ifbdev->helper);
613 }
614 
615 void intel_fbdev_restore_mode(struct drm_device *dev)
616 {
617 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
618 
619 	if (!ifbdev)
620 		return;
621 
622 	intel_fbdev_sync(ifbdev);
623 	if (!ifbdev->vma)
624 		return;
625 
626 	if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
627 		intel_fbdev_invalidate(ifbdev);
628 }
629