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_fillrect = drm_fb_helper_cfb_fillrect,
128 	.fb_copyarea = drm_fb_helper_cfb_copyarea,
129 	.fb_imageblit = drm_fb_helper_cfb_imageblit,
130 	.fb_pan_display = intel_fbdev_pan_display,
131 	.fb_blank = intel_fbdev_blank,
132 };
133 
134 static int intelfb_alloc(struct drm_fb_helper *helper,
135 			 struct drm_fb_helper_surface_size *sizes)
136 {
137 	struct intel_fbdev *ifbdev =
138 		container_of(helper, struct intel_fbdev, helper);
139 	struct drm_framebuffer *fb;
140 	struct drm_device *dev = helper->dev;
141 	struct drm_i915_private *dev_priv = to_i915(dev);
142 	struct drm_mode_fb_cmd2 mode_cmd = {};
143 	struct drm_i915_gem_object *obj;
144 	int size;
145 
146 	/* we don't do packed 24bpp */
147 	if (sizes->surface_bpp == 24)
148 		sizes->surface_bpp = 32;
149 
150 	mode_cmd.width = sizes->surface_width;
151 	mode_cmd.height = sizes->surface_height;
152 
153 	mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
154 				    DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
155 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
156 							  sizes->surface_depth);
157 
158 	size = mode_cmd.pitches[0] * mode_cmd.height;
159 	size = PAGE_ALIGN(size);
160 
161 	obj = ERR_PTR(-ENODEV);
162 	if (HAS_LMEM(dev_priv)) {
163 		obj = i915_gem_object_create_lmem(dev_priv, size,
164 						  I915_BO_ALLOC_CONTIGUOUS);
165 	} else {
166 		/*
167 		 * If the FB is too big, just don't use it since fbdev is not very
168 		 * important and we should probably use that space with FBC or other
169 		 * features.
170 		 */
171 		if (size * 2 < dev_priv->stolen_usable_size)
172 			obj = i915_gem_object_create_stolen(dev_priv, size);
173 		if (IS_ERR(obj))
174 			obj = i915_gem_object_create_shmem(dev_priv, size);
175 	}
176 
177 	if (IS_ERR(obj)) {
178 		drm_err(&dev_priv->drm, "failed to allocate framebuffer\n");
179 		return PTR_ERR(obj);
180 	}
181 
182 	fb = intel_framebuffer_create(obj, &mode_cmd);
183 	i915_gem_object_put(obj);
184 	if (IS_ERR(fb))
185 		return PTR_ERR(fb);
186 
187 	ifbdev->fb = to_intel_framebuffer(fb);
188 	return 0;
189 }
190 
191 static int intelfb_create(struct drm_fb_helper *helper,
192 			  struct drm_fb_helper_surface_size *sizes)
193 {
194 	struct intel_fbdev *ifbdev =
195 		container_of(helper, struct intel_fbdev, helper);
196 	struct intel_framebuffer *intel_fb = ifbdev->fb;
197 	struct drm_device *dev = helper->dev;
198 	struct drm_i915_private *dev_priv = to_i915(dev);
199 	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
200 	struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
201 	const struct i915_ggtt_view view = {
202 		.type = I915_GGTT_VIEW_NORMAL,
203 	};
204 	intel_wakeref_t wakeref;
205 	struct fb_info *info;
206 	struct i915_vma *vma;
207 	unsigned long flags = 0;
208 	bool prealloc = false;
209 	void __iomem *vaddr;
210 	struct drm_i915_gem_object *obj;
211 	int ret;
212 
213 	if (intel_fb &&
214 	    (sizes->fb_width > intel_fb->base.width ||
215 	     sizes->fb_height > intel_fb->base.height)) {
216 		drm_dbg_kms(&dev_priv->drm,
217 			    "BIOS fb too small (%dx%d), we require (%dx%d),"
218 			    " releasing it\n",
219 			    intel_fb->base.width, intel_fb->base.height,
220 			    sizes->fb_width, sizes->fb_height);
221 		drm_framebuffer_put(&intel_fb->base);
222 		intel_fb = ifbdev->fb = NULL;
223 	}
224 	if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
225 		drm_dbg_kms(&dev_priv->drm,
226 			    "no BIOS fb, allocating a new one\n");
227 		ret = intelfb_alloc(helper, sizes);
228 		if (ret)
229 			return ret;
230 		intel_fb = ifbdev->fb;
231 	} else {
232 		drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
233 		prealloc = true;
234 		sizes->fb_width = intel_fb->base.width;
235 		sizes->fb_height = intel_fb->base.height;
236 	}
237 
238 	wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
239 
240 	/* Pin the GGTT vma for our access via info->screen_base.
241 	 * This also validates that any existing fb inherited from the
242 	 * BIOS is suitable for own access.
243 	 */
244 	vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
245 					 &view, false, &flags);
246 	if (IS_ERR(vma)) {
247 		ret = PTR_ERR(vma);
248 		goto out_unlock;
249 	}
250 
251 	info = drm_fb_helper_alloc_fbi(helper);
252 	if (IS_ERR(info)) {
253 		drm_err(&dev_priv->drm, "Failed to allocate fb_info\n");
254 		ret = PTR_ERR(info);
255 		goto out_unpin;
256 	}
257 
258 	ifbdev->helper.fb = &ifbdev->fb->base;
259 
260 	info->fbops = &intelfb_ops;
261 
262 	/* setup aperture base/size for vesafb takeover */
263 	obj = intel_fb_obj(&intel_fb->base);
264 	if (i915_gem_object_is_lmem(obj)) {
265 		struct intel_memory_region *mem = obj->mm.region;
266 
267 		info->apertures->ranges[0].base = mem->io_start;
268 		info->apertures->ranges[0].size = mem->io_size;
269 
270 		/* Use fbdev's framebuffer from lmem for discrete */
271 		info->fix.smem_start =
272 			(unsigned long)(mem->io_start +
273 					i915_gem_object_get_dma_address(obj, 0));
274 		info->fix.smem_len = obj->base.size;
275 	} else {
276 		info->apertures->ranges[0].base = ggtt->gmadr.start;
277 		info->apertures->ranges[0].size = ggtt->mappable_end;
278 
279 		/* Our framebuffer is the entirety of fbdev's system memory */
280 		info->fix.smem_start =
281 			(unsigned long)(ggtt->gmadr.start + vma->node.start);
282 		info->fix.smem_len = vma->node.size;
283 	}
284 
285 	vaddr = i915_vma_pin_iomap(vma);
286 	if (IS_ERR(vaddr)) {
287 		drm_err(&dev_priv->drm,
288 			"Failed to remap framebuffer into virtual memory\n");
289 		ret = PTR_ERR(vaddr);
290 		goto out_unpin;
291 	}
292 	info->screen_base = vaddr;
293 	info->screen_size = vma->node.size;
294 
295 	drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
296 
297 	/* If the object is shmemfs backed, it will have given us zeroed pages.
298 	 * If the object is stolen however, it will be full of whatever
299 	 * garbage was left in there.
300 	 */
301 	if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
302 		memset_io(info->screen_base, 0, info->screen_size);
303 
304 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
305 
306 	drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
307 		    ifbdev->fb->base.width, ifbdev->fb->base.height,
308 		    i915_ggtt_offset(vma));
309 	ifbdev->vma = vma;
310 	ifbdev->vma_flags = flags;
311 
312 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
313 	vga_switcheroo_client_fb_set(pdev, info);
314 	return 0;
315 
316 out_unpin:
317 	intel_unpin_fb_vma(vma, flags);
318 out_unlock:
319 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
320 	return ret;
321 }
322 
323 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
324 	.fb_probe = intelfb_create,
325 };
326 
327 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
328 {
329 	/* We rely on the object-free to release the VMA pinning for
330 	 * the info->screen_base mmaping. Leaking the VMA is simpler than
331 	 * trying to rectify all the possible error paths leading here.
332 	 */
333 
334 	drm_fb_helper_fini(&ifbdev->helper);
335 
336 	if (ifbdev->vma)
337 		intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
338 
339 	if (ifbdev->fb)
340 		drm_framebuffer_remove(&ifbdev->fb->base);
341 
342 	kfree(ifbdev);
343 }
344 
345 /*
346  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
347  * The core display code will have read out the current plane configuration,
348  * so we use that to figure out if there's an object for us to use as the
349  * fb, and if so, we re-use it for the fbdev configuration.
350  *
351  * Note we only support a single fb shared across pipes for boot (mostly for
352  * fbcon), so we just find the biggest and use that.
353  */
354 static bool intel_fbdev_init_bios(struct drm_device *dev,
355 				  struct intel_fbdev *ifbdev)
356 {
357 	struct drm_i915_private *i915 = to_i915(dev);
358 	struct intel_framebuffer *fb = NULL;
359 	struct intel_crtc *crtc;
360 	unsigned int max_size = 0;
361 
362 	/* Find the largest fb */
363 	for_each_intel_crtc(dev, crtc) {
364 		struct intel_crtc_state *crtc_state =
365 			to_intel_crtc_state(crtc->base.state);
366 		struct intel_plane *plane =
367 			to_intel_plane(crtc->base.primary);
368 		struct intel_plane_state *plane_state =
369 			to_intel_plane_state(plane->base.state);
370 		struct drm_i915_gem_object *obj =
371 			intel_fb_obj(plane_state->uapi.fb);
372 
373 		if (!crtc_state->uapi.active) {
374 			drm_dbg_kms(&i915->drm,
375 				    "[CRTC:%d:%s] not active, skipping\n",
376 				    crtc->base.base.id, crtc->base.name);
377 			continue;
378 		}
379 
380 		if (!obj) {
381 			drm_dbg_kms(&i915->drm,
382 				    "[PLANE:%d:%s] no fb, skipping\n",
383 				    plane->base.base.id, plane->base.name);
384 			continue;
385 		}
386 
387 		if (obj->base.size > max_size) {
388 			drm_dbg_kms(&i915->drm,
389 				    "found possible fb from [PLANE:%d:%s]\n",
390 				    plane->base.base.id, plane->base.name);
391 			fb = to_intel_framebuffer(plane_state->uapi.fb);
392 			max_size = obj->base.size;
393 		}
394 	}
395 
396 	if (!fb) {
397 		drm_dbg_kms(&i915->drm,
398 			    "no active fbs found, not using BIOS config\n");
399 		goto out;
400 	}
401 
402 	/* Now make sure all the pipes will fit into it */
403 	for_each_intel_crtc(dev, crtc) {
404 		struct intel_crtc_state *crtc_state =
405 			to_intel_crtc_state(crtc->base.state);
406 		struct intel_plane *plane =
407 			to_intel_plane(crtc->base.primary);
408 		unsigned int cur_size;
409 
410 		if (!crtc_state->uapi.active) {
411 			drm_dbg_kms(&i915->drm,
412 				    "[CRTC:%d:%s] not active, skipping\n",
413 				    crtc->base.base.id, crtc->base.name);
414 			continue;
415 		}
416 
417 		drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
418 			    plane->base.base.id, plane->base.name);
419 
420 		/*
421 		 * See if the plane fb we found above will fit on this
422 		 * pipe.  Note we need to use the selected fb's pitch and bpp
423 		 * rather than the current pipe's, since they differ.
424 		 */
425 		cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
426 		cur_size = cur_size * fb->base.format->cpp[0];
427 		if (fb->base.pitches[0] < cur_size) {
428 			drm_dbg_kms(&i915->drm,
429 				    "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
430 				    plane->base.base.id, plane->base.name,
431 				    cur_size, fb->base.pitches[0]);
432 			fb = NULL;
433 			break;
434 		}
435 
436 		cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
437 		cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
438 		cur_size *= fb->base.pitches[0];
439 		drm_dbg_kms(&i915->drm,
440 			    "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
441 			    crtc->base.base.id, crtc->base.name,
442 			    crtc_state->uapi.adjusted_mode.crtc_hdisplay,
443 			    crtc_state->uapi.adjusted_mode.crtc_vdisplay,
444 			    fb->base.format->cpp[0] * 8,
445 			    cur_size);
446 
447 		if (cur_size > max_size) {
448 			drm_dbg_kms(&i915->drm,
449 				    "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
450 				    plane->base.base.id, plane->base.name,
451 				    cur_size, max_size);
452 			fb = NULL;
453 			break;
454 		}
455 
456 		drm_dbg_kms(&i915->drm,
457 			    "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
458 			    plane->base.base.id, plane->base.name,
459 			    max_size, cur_size);
460 	}
461 
462 	if (!fb) {
463 		drm_dbg_kms(&i915->drm,
464 			    "BIOS fb not suitable for all pipes, not using\n");
465 		goto out;
466 	}
467 
468 	ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
469 	ifbdev->fb = fb;
470 
471 	drm_framebuffer_get(&ifbdev->fb->base);
472 
473 	/* Final pass to check if any active pipes don't have fbs */
474 	for_each_intel_crtc(dev, crtc) {
475 		struct intel_crtc_state *crtc_state =
476 			to_intel_crtc_state(crtc->base.state);
477 		struct intel_plane *plane =
478 			to_intel_plane(crtc->base.primary);
479 		struct intel_plane_state *plane_state =
480 			to_intel_plane_state(plane->base.state);
481 
482 		if (!crtc_state->uapi.active)
483 			continue;
484 
485 		drm_WARN(dev, !plane_state->uapi.fb,
486 			 "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
487 			 plane->base.base.id, plane->base.name);
488 	}
489 
490 
491 	drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
492 	return true;
493 
494 out:
495 
496 	return false;
497 }
498 
499 static void intel_fbdev_suspend_worker(struct work_struct *work)
500 {
501 	intel_fbdev_set_suspend(&container_of(work,
502 					      struct drm_i915_private,
503 					      fbdev_suspend_work)->drm,
504 				FBINFO_STATE_RUNNING,
505 				true);
506 }
507 
508 int intel_fbdev_init(struct drm_device *dev)
509 {
510 	struct drm_i915_private *dev_priv = to_i915(dev);
511 	struct intel_fbdev *ifbdev;
512 	int ret;
513 
514 	if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
515 		return -ENODEV;
516 
517 	ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
518 	if (ifbdev == NULL)
519 		return -ENOMEM;
520 
521 	mutex_init(&ifbdev->hpd_lock);
522 	drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
523 
524 	if (!intel_fbdev_init_bios(dev, ifbdev))
525 		ifbdev->preferred_bpp = 32;
526 
527 	ret = drm_fb_helper_init(dev, &ifbdev->helper);
528 	if (ret) {
529 		kfree(ifbdev);
530 		return ret;
531 	}
532 
533 	dev_priv->fbdev = ifbdev;
534 	INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
535 
536 	return 0;
537 }
538 
539 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
540 {
541 	struct intel_fbdev *ifbdev = data;
542 
543 	/* Due to peculiar init order wrt to hpd handling this is separate. */
544 	if (drm_fb_helper_initial_config(&ifbdev->helper,
545 					 ifbdev->preferred_bpp))
546 		intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
547 }
548 
549 void intel_fbdev_initial_config_async(struct drm_device *dev)
550 {
551 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
552 
553 	if (!ifbdev)
554 		return;
555 
556 	ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
557 }
558 
559 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
560 {
561 	if (!ifbdev->cookie)
562 		return;
563 
564 	/* Only serialises with all preceding async calls, hence +1 */
565 	async_synchronize_cookie(ifbdev->cookie + 1);
566 	ifbdev->cookie = 0;
567 }
568 
569 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
570 {
571 	struct intel_fbdev *ifbdev = dev_priv->fbdev;
572 
573 	if (!ifbdev)
574 		return;
575 
576 	cancel_work_sync(&dev_priv->fbdev_suspend_work);
577 	if (!current_is_async())
578 		intel_fbdev_sync(ifbdev);
579 
580 	drm_fb_helper_unregister_fbi(&ifbdev->helper);
581 }
582 
583 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
584 {
585 	struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
586 
587 	if (!ifbdev)
588 		return;
589 
590 	intel_fbdev_destroy(ifbdev);
591 }
592 
593 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
594  * processing, fbdev will perform a full connector reprobe if a hotplug event
595  * was received while HPD was suspended.
596  */
597 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
598 {
599 	struct intel_fbdev *ifbdev = i915->fbdev;
600 	bool send_hpd = false;
601 
602 	mutex_lock(&ifbdev->hpd_lock);
603 	ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
604 	send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
605 	ifbdev->hpd_waiting = false;
606 	mutex_unlock(&ifbdev->hpd_lock);
607 
608 	if (send_hpd) {
609 		drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
610 		drm_fb_helper_hotplug_event(&ifbdev->helper);
611 	}
612 }
613 
614 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
615 {
616 	struct drm_i915_private *dev_priv = to_i915(dev);
617 	struct intel_fbdev *ifbdev = dev_priv->fbdev;
618 	struct fb_info *info;
619 
620 	if (!ifbdev || !ifbdev->vma)
621 		return;
622 
623 	info = ifbdev->helper.fbdev;
624 
625 	if (synchronous) {
626 		/* Flush any pending work to turn the console on, and then
627 		 * wait to turn it off. It must be synchronous as we are
628 		 * about to suspend or unload the driver.
629 		 *
630 		 * Note that from within the work-handler, we cannot flush
631 		 * ourselves, so only flush outstanding work upon suspend!
632 		 */
633 		if (state != FBINFO_STATE_RUNNING)
634 			flush_work(&dev_priv->fbdev_suspend_work);
635 
636 		console_lock();
637 	} else {
638 		/*
639 		 * The console lock can be pretty contented on resume due
640 		 * to all the printk activity.  Try to keep it out of the hot
641 		 * path of resume if possible.
642 		 */
643 		drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
644 		if (!console_trylock()) {
645 			/* Don't block our own workqueue as this can
646 			 * be run in parallel with other i915.ko tasks.
647 			 */
648 			schedule_work(&dev_priv->fbdev_suspend_work);
649 			return;
650 		}
651 	}
652 
653 	/* On resume from hibernation: If the object is shmemfs backed, it has
654 	 * been restored from swap. If the object is stolen however, it will be
655 	 * full of whatever garbage was left in there.
656 	 */
657 	if (state == FBINFO_STATE_RUNNING &&
658 	    !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
659 		memset_io(info->screen_base, 0, info->screen_size);
660 
661 	drm_fb_helper_set_suspend(&ifbdev->helper, state);
662 	console_unlock();
663 
664 	intel_fbdev_hpd_set_suspend(dev_priv, state);
665 }
666 
667 void intel_fbdev_output_poll_changed(struct drm_device *dev)
668 {
669 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
670 	bool send_hpd;
671 
672 	if (!ifbdev)
673 		return;
674 
675 	intel_fbdev_sync(ifbdev);
676 
677 	mutex_lock(&ifbdev->hpd_lock);
678 	send_hpd = !ifbdev->hpd_suspended;
679 	ifbdev->hpd_waiting = true;
680 	mutex_unlock(&ifbdev->hpd_lock);
681 
682 	if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
683 		drm_fb_helper_hotplug_event(&ifbdev->helper);
684 }
685 
686 void intel_fbdev_restore_mode(struct drm_device *dev)
687 {
688 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
689 
690 	if (!ifbdev)
691 		return;
692 
693 	intel_fbdev_sync(ifbdev);
694 	if (!ifbdev->vma)
695 		return;
696 
697 	if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
698 		intel_fbdev_invalidate(ifbdev);
699 }
700 
701 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
702 {
703 	if (!fbdev || !fbdev->helper.fb)
704 		return NULL;
705 
706 	return to_intel_framebuffer(fbdev->helper.fb);
707 }
708