drivers/gpu/drm/drm_fb_cma_helper.c

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