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1/*
2 * drm kms/fb cma (contiguous memory allocator) helper functions
3 *
4 * Copyright (C) 2012 Analog Device Inc.
5 * Author: Lars-Peter Clausen <lars@metafoo.de>
6 *
7 * Based on udl_fbdev.c
8 * Copyright (C) 2012 Red Hat
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#include <drm/drmP.h>
21#include <drm/drm_atomic.h>
22#include <drm/drm_crtc.h>
23#include <drm/drm_fb_helper.h>
24#include <drm/drm_crtc_helper.h>
25#include <drm/drm_gem_cma_helper.h>
26#include <drm/drm_fb_cma_helper.h>
27#include <linux/dma-buf.h>
28#include <linux/dma-mapping.h>
29#include <linux/module.h>
30#include <linux/reservation.h>
31
32#define DEFAULT_FBDEFIO_DELAY_MS 50
33
34struct drm_fb_cma {
35 struct drm_framebuffer fb;
36 struct drm_gem_cma_object *obj[4];
37};
38
39struct drm_fbdev_cma {
40 struct drm_fb_helper fb_helper;
41 struct drm_fb_cma *fb;
42};
43
44/**
45 * DOC: framebuffer cma helper functions
46 *
47 * Provides helper functions for creating a cma (contiguous memory allocator)
48 * backed framebuffer.
49 *
50 * drm_fb_cma_create() is used in the &drm_mode_config_funcs ->fb_create
51 * callback function to create a cma backed framebuffer.
52 *
53 * An fbdev framebuffer backed by cma is also available by calling
54 * drm_fbdev_cma_init(). drm_fbdev_cma_fini() tears it down.
55 * If the &drm_framebuffer_funcs ->dirty callback is set, fb_deferred_io
56 * will be set up automatically. dirty() is called by
57 * drm_fb_helper_deferred_io() in process context (struct delayed_work).
58 *
59 * Example fbdev deferred io code::
60 *
61 * static int driver_fbdev_fb_dirty(struct drm_framebuffer *fb,
62 * struct drm_file *file_priv,
63 * unsigned flags, unsigned color,
64 * struct drm_clip_rect *clips,
65 * unsigned num_clips)
66 * {
67 * struct drm_gem_cma_object *cma = drm_fb_cma_get_gem_obj(fb, 0);
68 * ... push changes ...
69 * return 0;
70 * }
71 *
72 * static struct drm_framebuffer_funcs driver_fbdev_fb_funcs = {
73 * .destroy = drm_fb_cma_destroy,
74 * .create_handle = drm_fb_cma_create_handle,
75 * .dirty = driver_fbdev_fb_dirty,
76 * };
77 *
78 * static int driver_fbdev_create(struct drm_fb_helper *helper,
79 * struct drm_fb_helper_surface_size *sizes)
80 * {
81 * return drm_fbdev_cma_create_with_funcs(helper, sizes,
82 * &driver_fbdev_fb_funcs);
83 * }
84 *
85 * static const struct drm_fb_helper_funcs driver_fb_helper_funcs = {
86 * .fb_probe = driver_fbdev_create,
87 * };
88 *
89 * Initialize:
90 * fbdev = drm_fbdev_cma_init_with_funcs(dev, 16,
91 * dev->mode_config.num_crtc,
92 * dev->mode_config.num_connector,
93 * &driver_fb_helper_funcs);
94 *
95 */
96
97static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
98{
99 return container_of(helper, struct drm_fbdev_cma, fb_helper);
100}
101
102static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
103{
104 return container_of(fb, struct drm_fb_cma, fb);
105}
106
107void drm_fb_cma_destroy(struct drm_framebuffer *fb)
108{
109 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
110 int i;
111
112 for (i = 0; i < 4; i++) {
113 if (fb_cma->obj[i])
114 drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
115 }
116
117 drm_framebuffer_cleanup(fb);
118 kfree(fb_cma);
119}
120EXPORT_SYMBOL(drm_fb_cma_destroy);
121
122int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
123 struct drm_file *file_priv, unsigned int *handle)
124{
125 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
126
127 return drm_gem_handle_create(file_priv,
128 &fb_cma->obj[0]->base, handle);
129}
130EXPORT_SYMBOL(drm_fb_cma_create_handle);
131
132static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
133 .destroy = drm_fb_cma_destroy,
134 .create_handle = drm_fb_cma_create_handle,
135};
136
137static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
138 const struct drm_mode_fb_cmd2 *mode_cmd,
139 struct drm_gem_cma_object **obj,
140 unsigned int num_planes, const struct drm_framebuffer_funcs *funcs)
141{
142 struct drm_fb_cma *fb_cma;
143 int ret;
144 int i;
145
146 fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
147 if (!fb_cma)
148 return ERR_PTR(-ENOMEM);
149
150 drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);
151
152 for (i = 0; i < num_planes; i++)
153 fb_cma->obj[i] = obj[i];
154
155 ret = drm_framebuffer_init(dev, &fb_cma->fb, funcs);
156 if (ret) {
157 dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
158 kfree(fb_cma);
159 return ERR_PTR(ret);
160 }
161
162 return fb_cma;
163}
164
165/**
166 * drm_fb_cma_create_with_funcs() - helper function for the
167 * &drm_mode_config_funcs ->fb_create
168 * callback function
169 * @dev: DRM device
170 * @file_priv: drm file for the ioctl call
171 * @mode_cmd: metadata from the userspace fb creation request
172 * @funcs: vtable to be used for the new framebuffer object
173 *
174 * This can be used to set &drm_framebuffer_funcs for drivers that need the
175 * dirty() callback. Use drm_fb_cma_create() if you don't need to change
176 * &drm_framebuffer_funcs.
177 */
178struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device *dev,
179 struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
180 const struct drm_framebuffer_funcs *funcs)
181{
182 const struct drm_format_info *info;
183 struct drm_fb_cma *fb_cma;
184 struct drm_gem_cma_object *objs[4];
185 struct drm_gem_object *obj;
186 int ret;
187 int i;
188
189 info = drm_format_info(mode_cmd->pixel_format);
190 if (!info)
191 return ERR_PTR(-EINVAL);
192
193 for (i = 0; i < info->num_planes; i++) {
194 unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
195 unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
196 unsigned int min_size;
197
198 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
199 if (!obj) {
200 dev_err(dev->dev, "Failed to lookup GEM object\n");
201 ret = -ENXIO;
202 goto err_gem_object_unreference;
203 }
204
205 min_size = (height - 1) * mode_cmd->pitches[i]
206 + width * info->cpp[i]
207 + mode_cmd->offsets[i];
208
209 if (obj->size < min_size) {
210 drm_gem_object_unreference_unlocked(obj);
211 ret = -EINVAL;
212 goto err_gem_object_unreference;
213 }
214 objs[i] = to_drm_gem_cma_obj(obj);
215 }
216
217 fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i, funcs);
218 if (IS_ERR(fb_cma)) {
219 ret = PTR_ERR(fb_cma);
220 goto err_gem_object_unreference;
221 }
222
223 return &fb_cma->fb;
224
225err_gem_object_unreference:
226 for (i--; i >= 0; i--)
227 drm_gem_object_unreference_unlocked(&objs[i]->base);
228 return ERR_PTR(ret);
229}
230EXPORT_SYMBOL_GPL(drm_fb_cma_create_with_funcs);
231
232/**
233 * drm_fb_cma_create() - &drm_mode_config_funcs ->fb_create callback function
234 * @dev: DRM device
235 * @file_priv: drm file for the ioctl call
236 * @mode_cmd: metadata from the userspace fb creation request
237 *
238 * If your hardware has special alignment or pitch requirements these should be
239 * checked before calling this function. Use drm_fb_cma_create_with_funcs() if
240 * you need to set &drm_framebuffer_funcs ->dirty.
241 */
242struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
243 struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
244{
245 return drm_fb_cma_create_with_funcs(dev, file_priv, mode_cmd,
246 &drm_fb_cma_funcs);
247}
248EXPORT_SYMBOL_GPL(drm_fb_cma_create);
249
250/**
251 * drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
252 * @fb: The framebuffer
253 * @plane: Which plane
254 *
255 * Return the CMA GEM object for given framebuffer.
256 *
257 * This function will usually be called from the CRTC callback functions.
258 */
259struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
260 unsigned int plane)
261{
262 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
263
264 if (plane >= 4)
265 return NULL;
266
267 return fb_cma->obj[plane];
268}
269EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
270
271/**
272 * drm_fb_cma_prepare_fb() - Prepare CMA framebuffer
273 * @plane: Which plane
274 * @state: Plane state attach fence to
275 *
276 * This should be put into prepare_fb hook of struct &drm_plane_helper_funcs .
277 *
278 * This function checks if the plane FB has an dma-buf attached, extracts
279 * the exclusive fence and attaches it to plane state for the atomic helper
280 * to wait on.
281 *
282 * There is no need for cleanup_fb for CMA based framebuffer drivers.
283 */
284int drm_fb_cma_prepare_fb(struct drm_plane *plane,
285 struct drm_plane_state *state)
286{
287 struct dma_buf *dma_buf;
288 struct dma_fence *fence;
289
290 if ((plane->state->fb == state->fb) || !state->fb)
291 return 0;
292
293 dma_buf = drm_fb_cma_get_gem_obj(state->fb, 0)->base.dma_buf;
294 if (dma_buf) {
295 fence = reservation_object_get_excl_rcu(dma_buf->resv);
296 drm_atomic_set_fence_for_plane(state, fence);
297 }
298
299 return 0;
300}
301EXPORT_SYMBOL_GPL(drm_fb_cma_prepare_fb);
302
303#ifdef CONFIG_DEBUG_FS
304static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
305{
306 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
307 const struct drm_format_info *info;
308 int i;
309
310 seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
311 (char *)&fb->pixel_format);
312
313 info = drm_format_info(fb->pixel_format);
314
315 for (i = 0; i < info->num_planes; i++) {
316 seq_printf(m, " %d: offset=%d pitch=%d, obj: ",
317 i, fb->offsets[i], fb->pitches[i]);
318 drm_gem_cma_describe(fb_cma->obj[i], m);
319 }
320}
321
322/**
323 * drm_fb_cma_debugfs_show() - Helper to list CMA framebuffer objects
324 * in debugfs.
325 * @m: output file
326 * @arg: private data for the callback
327 */
328int drm_fb_cma_debugfs_show(struct seq_file *m, void *arg)
329{
330 struct drm_info_node *node = (struct drm_info_node *) m->private;
331 struct drm_device *dev = node->minor->dev;
332 struct drm_framebuffer *fb;
333
334 mutex_lock(&dev->mode_config.fb_lock);
335 drm_for_each_fb(fb, dev)
336 drm_fb_cma_describe(fb, m);
337 mutex_unlock(&dev->mode_config.fb_lock);
338
339 return 0;
340}
341EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
342#endif
343
344static int drm_fb_cma_mmap(struct fb_info *info, struct vm_area_struct *vma)
345{
346 return dma_mmap_writecombine(info->device, vma, info->screen_base,
347 info->fix.smem_start, info->fix.smem_len);
348}
349
350static struct fb_ops drm_fbdev_cma_ops = {
351 .owner = THIS_MODULE,
352 DRM_FB_HELPER_DEFAULT_OPS,
353 .fb_fillrect = drm_fb_helper_sys_fillrect,
354 .fb_copyarea = drm_fb_helper_sys_copyarea,
355 .fb_imageblit = drm_fb_helper_sys_imageblit,
356 .fb_mmap = drm_fb_cma_mmap,
357};
358
359static int drm_fbdev_cma_deferred_io_mmap(struct fb_info *info,
360 struct vm_area_struct *vma)
361{
362 fb_deferred_io_mmap(info, vma);
363 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
364
365 return 0;
366}
367
368static int drm_fbdev_cma_defio_init(struct fb_info *fbi,
369 struct drm_gem_cma_object *cma_obj)
370{
371 struct fb_deferred_io *fbdefio;
372 struct fb_ops *fbops;
373
374 /*
375 * Per device structures are needed because:
376 * fbops: fb_deferred_io_cleanup() clears fbops.fb_mmap
377 * fbdefio: individual delays
378 */
379 fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL);
380 fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
381 if (!fbdefio || !fbops) {
382 kfree(fbdefio);
383 kfree(fbops);
384 return -ENOMEM;
385 }
386
387 /* can't be offset from vaddr since dirty() uses cma_obj */
388 fbi->screen_buffer = cma_obj->vaddr;
389 /* fb_deferred_io_fault() needs a physical address */
390 fbi->fix.smem_start = page_to_phys(virt_to_page(fbi->screen_buffer));
391
392 *fbops = *fbi->fbops;
393 fbi->fbops = fbops;
394
395 fbdefio->delay = msecs_to_jiffies(DEFAULT_FBDEFIO_DELAY_MS);
396 fbdefio->deferred_io = drm_fb_helper_deferred_io;
397 fbi->fbdefio = fbdefio;
398 fb_deferred_io_init(fbi);
399 fbi->fbops->fb_mmap = drm_fbdev_cma_deferred_io_mmap;
400
401 return 0;
402}
403
404static void drm_fbdev_cma_defio_fini(struct fb_info *fbi)
405{
406 if (!fbi->fbdefio)
407 return;
408
409 fb_deferred_io_cleanup(fbi);
410 kfree(fbi->fbdefio);
411 kfree(fbi->fbops);
412}
413
414/*
415 * For use in a (struct drm_fb_helper_funcs *)->fb_probe callback function that
416 * needs custom struct drm_framebuffer_funcs, like dirty() for deferred_io use.
417 */
418int drm_fbdev_cma_create_with_funcs(struct drm_fb_helper *helper,
419 struct drm_fb_helper_surface_size *sizes,
420 const struct drm_framebuffer_funcs *funcs)
421{
422 struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
423 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
424 struct drm_device *dev = helper->dev;
425 struct drm_gem_cma_object *obj;
426 struct drm_framebuffer *fb;
427 unsigned int bytes_per_pixel;
428 unsigned long offset;
429 struct fb_info *fbi;
430 size_t size;
431 int ret;
432
433 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
434 sizes->surface_width, sizes->surface_height,
435 sizes->surface_bpp);
436
437 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
438
439 mode_cmd.width = sizes->surface_width;
440 mode_cmd.height = sizes->surface_height;
441 mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
442 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
443 sizes->surface_depth);
444
445 size = mode_cmd.pitches[0] * mode_cmd.height;
446 obj = drm_gem_cma_create(dev, size);
447 if (IS_ERR(obj))
448 return -ENOMEM;
449
450 fbi = drm_fb_helper_alloc_fbi(helper);
451 if (IS_ERR(fbi)) {
452 ret = PTR_ERR(fbi);
453 goto err_gem_free_object;
454 }
455
456 fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1, funcs);
457 if (IS_ERR(fbdev_cma->fb)) {
458 dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
459 ret = PTR_ERR(fbdev_cma->fb);
460 goto err_fb_info_destroy;
461 }
462
463 fb = &fbdev_cma->fb->fb;
464 helper->fb = fb;
465
466 fbi->par = helper;
467 fbi->flags = FBINFO_FLAG_DEFAULT;
468 fbi->fbops = &drm_fbdev_cma_ops;
469
470 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
471 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
472
473 offset = fbi->var.xoffset * bytes_per_pixel;
474 offset += fbi->var.yoffset * fb->pitches[0];
475
476 dev->mode_config.fb_base = (resource_size_t)obj->paddr;
477 fbi->screen_base = obj->vaddr + offset;
478 fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
479 fbi->screen_size = size;
480 fbi->fix.smem_len = size;
481
482 if (funcs->dirty) {
483 ret = drm_fbdev_cma_defio_init(fbi, obj);
484 if (ret)
485 goto err_cma_destroy;
486 }
487
488 return 0;
489
490err_cma_destroy:
491 drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);
492 drm_fb_cma_destroy(&fbdev_cma->fb->fb);
493err_fb_info_destroy:
494 drm_fb_helper_release_fbi(helper);
495err_gem_free_object:
496 drm_gem_object_unreference_unlocked(&obj->base);
497 return ret;
498}
499EXPORT_SYMBOL(drm_fbdev_cma_create_with_funcs);
500
501static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
502 struct drm_fb_helper_surface_size *sizes)
503{
504 return drm_fbdev_cma_create_with_funcs(helper, sizes, &drm_fb_cma_funcs);
505}
506
507static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
508 .fb_probe = drm_fbdev_cma_create,
509};
510
511/**
512 * drm_fbdev_cma_init_with_funcs() - Allocate and initializes a drm_fbdev_cma struct
513 * @dev: DRM device
514 * @preferred_bpp: Preferred bits per pixel for the device
515 * @num_crtc: Number of CRTCs
516 * @max_conn_count: Maximum number of connectors
517 * @funcs: fb helper functions, in particular fb_probe()
518 *
519 * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
520 */
521struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
522 unsigned int preferred_bpp, unsigned int num_crtc,
523 unsigned int max_conn_count, const struct drm_fb_helper_funcs *funcs)
524{
525 struct drm_fbdev_cma *fbdev_cma;
526 struct drm_fb_helper *helper;
527 int ret;
528
529 fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
530 if (!fbdev_cma) {
531 dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
532 return ERR_PTR(-ENOMEM);
533 }
534
535 helper = &fbdev_cma->fb_helper;
536
537 drm_fb_helper_prepare(dev, helper, funcs);
538
539 ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
540 if (ret < 0) {
541 dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
542 goto err_free;
543 }
544
545 ret = drm_fb_helper_single_add_all_connectors(helper);
546 if (ret < 0) {
547 dev_err(dev->dev, "Failed to add connectors.\n");
548 goto err_drm_fb_helper_fini;
549
550 }
551
552 ret = drm_fb_helper_initial_config(helper, preferred_bpp);
553 if (ret < 0) {
554 dev_err(dev->dev, "Failed to set initial hw configuration.\n");
555 goto err_drm_fb_helper_fini;
556 }
557
558 return fbdev_cma;
559
560err_drm_fb_helper_fini:
561 drm_fb_helper_fini(helper);
562err_free:
563 kfree(fbdev_cma);
564
565 return ERR_PTR(ret);
566}
567EXPORT_SYMBOL_GPL(drm_fbdev_cma_init_with_funcs);
568
569/**
570 * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
571 * @dev: DRM device
572 * @preferred_bpp: Preferred bits per pixel for the device
573 * @num_crtc: Number of CRTCs
574 * @max_conn_count: Maximum number of connectors
575 *
576 * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
577 */
578struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
579 unsigned int preferred_bpp, unsigned int num_crtc,
580 unsigned int max_conn_count)
581{
582 return drm_fbdev_cma_init_with_funcs(dev, preferred_bpp, num_crtc,
583 max_conn_count, &drm_fb_cma_helper_funcs);
584}
585EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
586
587/**
588 * drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
589 * @fbdev_cma: The drm_fbdev_cma struct
590 */
591void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
592{
593 drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
594 if (fbdev_cma->fb_helper.fbdev)
595 drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
596 drm_fb_helper_release_fbi(&fbdev_cma->fb_helper);
597
598 if (fbdev_cma->fb) {
599 drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);
600 drm_fb_cma_destroy(&fbdev_cma->fb->fb);
601 }
602
603 drm_fb_helper_fini(&fbdev_cma->fb_helper);
604 kfree(fbdev_cma);
605}
606EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);
607
608/**
609 * drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
610 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
611 *
612 * This function is usually called from the DRM drivers lastclose callback.
613 */
614void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
615{
616 if (fbdev_cma)
617 drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev_cma->fb_helper);
618}
619EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);
620
621/**
622 * drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
623 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
624 *
625 * This function is usually called from the DRM drivers output_poll_changed
626 * callback.
627 */
628void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
629{
630 if (fbdev_cma)
631 drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
632}
633EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);
634
635/**
636 * drm_fbdev_cma_set_suspend - wrapper around drm_fb_helper_set_suspend
637 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
638 * @state: desired state, zero to resume, non-zero to suspend
639 *
640 * Calls drm_fb_helper_set_suspend, which is a wrapper around
641 * fb_set_suspend implemented by fbdev core.
642 */
643void drm_fbdev_cma_set_suspend(struct drm_fbdev_cma *fbdev_cma, int state)
644{
645 if (fbdev_cma)
646 drm_fb_helper_set_suspend(&fbdev_cma->fb_helper, state);
647}
648EXPORT_SYMBOL(drm_fbdev_cma_set_suspend);