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 = -ENOENT;
 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_get_gem_addr() - Get physical address for framebuffer
 264  * @fb: The framebuffer
 265  * @state: Which state of drm plane
 266  * @plane: Which plane
 267  * Return the CMA GEM address for given framebuffer.
 268  *
 269  * This function will usually be called from the PLANE callback functions.
 270  */
 271 dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
 272                                    struct drm_plane_state *state,
 273                                    unsigned int plane)
 274 {
 275         struct drm_fb_cma *fb_cma = to_fb_cma(fb);
 276         dma_addr_t paddr;
 277
 278         if (plane >= 4)
 279                 return 0;
 280
 281         paddr = fb_cma->obj[plane]->paddr + fb->offsets[plane];
 282         paddr += fb->format->cpp[plane] * (state->src_x >> 16);
 283         paddr += fb->pitches[plane] * (state->src_y >> 16);
 284
 285         return paddr;
 286 }
 287 EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
 288
 289 /**
 290  * drm_fb_cma_prepare_fb() - Prepare CMA framebuffer
 291  * @plane: Which plane
 292  * @state: Plane state attach fence to
 293  *
 294  * This should be set as the &struct drm_plane_helper_funcs.prepare_fb hook.
 295  *
 296  * This function checks if the plane FB has an dma-buf attached, extracts
 297  * the exclusive fence and attaches it to plane state for the atomic helper
 298  * to wait on.
 299  *
 300  * There is no need for cleanup_fb for CMA based framebuffer drivers.
 301  */
 302 int drm_fb_cma_prepare_fb(struct drm_plane *plane,
 303                           struct drm_plane_state *state)
 304 {
 305         struct dma_buf *dma_buf;
 306         struct dma_fence *fence;
 307
 308         if ((plane->state->fb == state->fb) || !state->fb)
 309                 return 0;
 310
 311         dma_buf = drm_fb_cma_get_gem_obj(state->fb, 0)->base.dma_buf;
 312         if (dma_buf) {
 313                 fence = reservation_object_get_excl_rcu(dma_buf->resv);
 314                 drm_atomic_set_fence_for_plane(state, fence);
 315         }
 316
 317         return 0;
 318 }
 319 EXPORT_SYMBOL_GPL(drm_fb_cma_prepare_fb);
 320
 321 #ifdef CONFIG_DEBUG_FS
 322 static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
 323 {
 324         struct drm_fb_cma *fb_cma = to_fb_cma(fb);
 325         int i;
 326
 327         seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
 328                         (char *)&fb->format->format);
 329
 330         for (i = 0; i < fb->format->num_planes; i++) {
 331                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 332                                 i, fb->offsets[i], fb->pitches[i]);
 333                 drm_gem_cma_describe(fb_cma->obj[i], m);
 334         }
 335 }
 336
 337 /**
 338  * drm_fb_cma_debugfs_show() - Helper to list CMA framebuffer objects
 339  *                             in debugfs.
 340  * @m: output file
 341  * @arg: private data for the callback
 342  */
 343 int drm_fb_cma_debugfs_show(struct seq_file *m, void *arg)
 344 {
 345         struct drm_info_node *node = (struct drm_info_node *) m->private;
 346         struct drm_device *dev = node->minor->dev;
 347         struct drm_framebuffer *fb;
 348
 349         mutex_lock(&dev->mode_config.fb_lock);
 350         drm_for_each_fb(fb, dev)
 351                 drm_fb_cma_describe(fb, m);
 352         mutex_unlock(&dev->mode_config.fb_lock);
 353
 354         return 0;
 355 }
 356 EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
 357 #endif
 358
 359 static int drm_fb_cma_mmap(struct fb_info *info, struct vm_area_struct *vma)
 360 {
 361         return dma_mmap_writecombine(info->device, vma, info->screen_base,
 362                                      info->fix.smem_start, info->fix.smem_len);
 363 }
 364
 365 static struct fb_ops drm_fbdev_cma_ops = {
 366         .owner          = THIS_MODULE,
 367         DRM_FB_HELPER_DEFAULT_OPS,
 368         .fb_fillrect    = drm_fb_helper_sys_fillrect,
 369         .fb_copyarea    = drm_fb_helper_sys_copyarea,
 370         .fb_imageblit   = drm_fb_helper_sys_imageblit,
 371         .fb_mmap        = drm_fb_cma_mmap,
 372 };
 373
 374 static int drm_fbdev_cma_deferred_io_mmap(struct fb_info *info,
 375                                           struct vm_area_struct *vma)
 376 {
 377         fb_deferred_io_mmap(info, vma);
 378         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 379
 380         return 0;
 381 }
 382
 383 static int drm_fbdev_cma_defio_init(struct fb_info *fbi,
 384                                     struct drm_gem_cma_object *cma_obj)
 385 {
 386         struct fb_deferred_io *fbdefio;
 387         struct fb_ops *fbops;
 388
 389         /*
 390          * Per device structures are needed because:
 391          * fbops: fb_deferred_io_cleanup() clears fbops.fb_mmap
 392          * fbdefio: individual delays
 393          */
 394         fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL);
 395         fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
 396         if (!fbdefio || !fbops) {
 397                 kfree(fbdefio);
 398                 kfree(fbops);
 399                 return -ENOMEM;
 400         }
 401
 402         /* can't be offset from vaddr since dirty() uses cma_obj */
 403         fbi->screen_buffer = cma_obj->vaddr;
 404         /* fb_deferred_io_fault() needs a physical address */
 405         fbi->fix.smem_start = page_to_phys(virt_to_page(fbi->screen_buffer));
 406
 407         *fbops = *fbi->fbops;
 408         fbi->fbops = fbops;
 409
 410         fbdefio->delay = msecs_to_jiffies(DEFAULT_FBDEFIO_DELAY_MS);
 411         fbdefio->deferred_io = drm_fb_helper_deferred_io;
 412         fbi->fbdefio = fbdefio;
 413         fb_deferred_io_init(fbi);
 414         fbi->fbops->fb_mmap = drm_fbdev_cma_deferred_io_mmap;
 415
 416         return 0;
 417 }
 418
 419 static void drm_fbdev_cma_defio_fini(struct fb_info *fbi)
 420 {
 421         if (!fbi->fbdefio)
 422                 return;
 423
 424         fb_deferred_io_cleanup(fbi);
 425         kfree(fbi->fbdefio);
 426         kfree(fbi->fbops);
 427 }
 428
 429 static int
 430 drm_fbdev_cma_create(struct drm_fb_helper *helper,
 431         struct drm_fb_helper_surface_size *sizes)
 432 {
 433         struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
 434         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 435         struct drm_device *dev = helper->dev;
 436         struct drm_gem_cma_object *obj;
 437         struct drm_framebuffer *fb;
 438         unsigned int bytes_per_pixel;
 439         unsigned long offset;
 440         struct fb_info *fbi;
 441         size_t size;
 442         int ret;
 443
 444         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
 445                         sizes->surface_width, sizes->surface_height,
 446                         sizes->surface_bpp);
 447
 448         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 449
 450         mode_cmd.width = sizes->surface_width;
 451         mode_cmd.height = sizes->surface_height;
 452         mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
 453         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 454                 sizes->surface_depth);
 455
 456         size = mode_cmd.pitches[0] * mode_cmd.height;
 457         obj = drm_gem_cma_create(dev, size);
 458         if (IS_ERR(obj))
 459                 return -ENOMEM;
 460
 461         fbi = drm_fb_helper_alloc_fbi(helper);
 462         if (IS_ERR(fbi)) {
 463                 ret = PTR_ERR(fbi);
 464                 goto err_gem_free_object;
 465         }
 466
 467         fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1,
 468                                          fbdev_cma->fb_funcs);
 469         if (IS_ERR(fbdev_cma->fb)) {
 470                 dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
 471                 ret = PTR_ERR(fbdev_cma->fb);
 472                 goto err_fb_info_destroy;
 473         }
 474
 475         fb = &fbdev_cma->fb->fb;
 476         helper->fb = fb;
 477
 478         fbi->par = helper;
 479         fbi->flags = FBINFO_FLAG_DEFAULT;
 480         fbi->fbops = &drm_fbdev_cma_ops;
 481
 482         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
 483         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 484
 485         offset = fbi->var.xoffset * bytes_per_pixel;
 486         offset += fbi->var.yoffset * fb->pitches[0];
 487
 488         dev->mode_config.fb_base = (resource_size_t)obj->paddr;
 489         fbi->screen_base = obj->vaddr + offset;
 490         fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
 491         fbi->screen_size = size;
 492         fbi->fix.smem_len = size;
 493
 494         if (fbdev_cma->fb_funcs->dirty) {
 495                 ret = drm_fbdev_cma_defio_init(fbi, obj);
 496                 if (ret)
 497                         goto err_cma_destroy;
 498         }
 499
 500         return 0;
 501
 502 err_cma_destroy:
 503         drm_framebuffer_remove(&fbdev_cma->fb->fb);
 504 err_fb_info_destroy:
 505         drm_fb_helper_fini(helper);
 506 err_gem_free_object:
 507         drm_gem_object_put_unlocked(&obj->base);
 508         return ret;
 509 }
 510
 511 static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
 512         .fb_probe = drm_fbdev_cma_create,
 513 };
 514
 515 /**
 516  * drm_fbdev_cma_init_with_funcs() - Allocate and initializes a drm_fbdev_cma struct
 517  * @dev: DRM device
 518  * @preferred_bpp: Preferred bits per pixel for the device
 519  * @max_conn_count: Maximum number of connectors
 520  * @funcs: fb helper functions, in particular a custom dirty() callback
 521  *
 522  * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
 523  */
 524 struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
 525         unsigned int preferred_bpp, unsigned int max_conn_count,
 526         const struct drm_framebuffer_funcs *funcs)
 527 {
 528         struct drm_fbdev_cma *fbdev_cma;
 529         struct drm_fb_helper *helper;
 530         int ret;
 531
 532         fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
 533         if (!fbdev_cma) {
 534                 dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
 535                 return ERR_PTR(-ENOMEM);
 536         }
 537         fbdev_cma->fb_funcs = funcs;
 538
 539         helper = &fbdev_cma->fb_helper;
 540
 541         drm_fb_helper_prepare(dev, helper, &drm_fb_cma_helper_funcs);
 542
 543         ret = drm_fb_helper_init(dev, helper, max_conn_count);
 544         if (ret < 0) {
 545                 dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
 546                 goto err_free;
 547         }
 548
 549         ret = drm_fb_helper_single_add_all_connectors(helper);
 550         if (ret < 0) {
 551                 dev_err(dev->dev, "Failed to add connectors.\n");
 552                 goto err_drm_fb_helper_fini;
 553
 554         }
 555
 556         ret = drm_fb_helper_initial_config(helper, preferred_bpp);
 557         if (ret < 0) {
 558                 dev_err(dev->dev, "Failed to set initial hw configuration.\n");
 559                 goto err_drm_fb_helper_fini;
 560         }
 561
 562         return fbdev_cma;
 563
 564 err_drm_fb_helper_fini:
 565         drm_fb_helper_fini(helper);
 566 err_free:
 567         kfree(fbdev_cma);
 568
 569         return ERR_PTR(ret);
 570 }
 571 EXPORT_SYMBOL_GPL(drm_fbdev_cma_init_with_funcs);
 572
 573 /**
 574  * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
 575  * @dev: DRM device
 576  * @preferred_bpp: Preferred bits per pixel for the device
 577  * @max_conn_count: Maximum number of connectors
 578  *
 579  * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
 580  */
 581 struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
 582         unsigned int preferred_bpp, unsigned int max_conn_count)
 583 {
 584         return drm_fbdev_cma_init_with_funcs(dev, preferred_bpp,
 585                                              max_conn_count,
 586                                              &drm_fb_cma_funcs);
 587 }
 588 EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
 589
 590 /**
 591  * drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
 592  * @fbdev_cma: The drm_fbdev_cma struct
 593  */
 594 void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
 595 {
 596         drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
 597         if (fbdev_cma->fb_helper.fbdev)
 598                 drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
 599
 600         if (fbdev_cma->fb)
 601                 drm_framebuffer_remove(&fbdev_cma->fb->fb);
 602
 603         drm_fb_helper_fini(&fbdev_cma->fb_helper);
 604         kfree(fbdev_cma);
 605 }
 606 EXPORT_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_driver.lastclose callback.
 613  */
 614 void 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 }
 619 EXPORT_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_mode_config.output_poll_changed
 626  * callback.
 627  */
 628 void 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 }
 633 EXPORT_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  */
 643 void 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 }
 648 EXPORT_SYMBOL(drm_fbdev_cma_set_suspend);
 649
 650 /**
 651  * drm_fbdev_cma_set_suspend_unlocked - wrapper around
 652  *                                      drm_fb_helper_set_suspend_unlocked
 653  * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
 654  * @state: desired state, zero to resume, non-zero to suspend
 655  *
 656  * Calls drm_fb_helper_set_suspend, which is a wrapper around
 657  * fb_set_suspend implemented by fbdev core.
 658  */
 659 void drm_fbdev_cma_set_suspend_unlocked(struct drm_fbdev_cma *fbdev_cma,
 660                                         int state)
 661 {
 662         if (fbdev_cma)
 663                 drm_fb_helper_set_suspend_unlocked(&fbdev_cma->fb_helper,
 664                                                    state);
 665 }
 666 EXPORT_SYMBOL(drm_fbdev_cma_set_suspend_unlocked);