drivers/gpu/drm/rockchip/rockchip_drm_drv.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:Mark Yao <mark.yao@rock-chips.com>
   4  *
   5  * based on exynos_drm_drv.c
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/dma-iommu.h>
  18
  19 #include <drm/drmP.h>
  20 #include <drm/drm_crtc_helper.h>
  21 #include <drm/drm_fb_helper.h>
  22 #include <drm/drm_sync_helper.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/module.h>
  26 #include <linux/of_graph.h>
  27 #include <linux/component.h>
  28 #include <linux/fence.h>
  29
  30 #include <drm/rockchip_drm.h>
  31
  32 #include "rockchip_drm_drv.h"
  33 #include "rockchip_drm_fb.h"
  34 #include "rockchip_drm_fbdev.h"
  35 #include "rockchip_drm_gem.h"
  36
  37 #define DRIVER_NAME     "rockchip"
  38 #define DRIVER_DESC     "RockChip Soc DRM"
  39 #define DRIVER_DATE     "20140818"
  40 #define DRIVER_MAJOR    1
  41 #define DRIVER_MINOR    0
  42
  43 /*
  44  * Attach a (component) device to the shared drm dma mapping from master drm
  45  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  46  * mapping.
  47  */
  48 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  49                                    struct device *dev)
  50 {
  51         struct rockchip_drm_private *private = drm_dev->dev_private;
  52         struct iommu_domain *domain = private->domain;
  53         int ret;
  54
  55         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
  56         if (ret)
  57                 return ret;
  58
  59         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
  60         ret = iommu_attach_device(domain, dev);
  61         if (ret) {
  62                 dev_err(dev, "Failed to attach iommu device\n");
  63                 return ret;
  64         }
  65
  66         if (!common_iommu_setup_dma_ops(dev, 0x10000000, SZ_2G, domain->ops)) {
  67                 dev_err(dev, "Failed to set dma_ops\n");
  68                 iommu_detach_device(domain, dev);
  69                 ret = -ENODEV;
  70         }
  71
  72         return ret;
  73 }
  74
  75 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  76                                     struct device *dev)
  77 {
  78         struct rockchip_drm_private *private = drm_dev->dev_private;
  79         struct iommu_domain *domain = private->domain;
  80
  81         iommu_detach_device(domain, dev);
  82 }
  83
  84 int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
  85                                  const struct rockchip_crtc_funcs *crtc_funcs)
  86 {
  87         int pipe = drm_crtc_index(crtc);
  88         struct rockchip_drm_private *priv = crtc->dev->dev_private;
  89
  90         if (pipe > ROCKCHIP_MAX_CRTC)
  91                 return -EINVAL;
  92
  93         priv->crtc_funcs[pipe] = crtc_funcs;
  94
  95         return 0;
  96 }
  97
  98 void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
  99 {
 100         int pipe = drm_crtc_index(crtc);
 101         struct rockchip_drm_private *priv = crtc->dev->dev_private;
 102
 103         if (pipe > ROCKCHIP_MAX_CRTC)
 104                 return;
 105
 106         priv->crtc_funcs[pipe] = NULL;
 107 }
 108
 109 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
 110                                                 int pipe)
 111 {
 112         struct drm_crtc *crtc;
 113         int i = 0;
 114
 115         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 116                 if (i++ == pipe)
 117                         return crtc;
 118
 119         return NULL;
 120 }
 121
 122 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
 123                                            unsigned int pipe)
 124 {
 125         struct rockchip_drm_private *priv = dev->dev_private;
 126         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 127
 128         if (crtc && priv->crtc_funcs[pipe] &&
 129             priv->crtc_funcs[pipe]->enable_vblank)
 130                 return priv->crtc_funcs[pipe]->enable_vblank(crtc);
 131
 132         return 0;
 133 }
 134
 135 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
 136                                              unsigned int pipe)
 137 {
 138         struct rockchip_drm_private *priv = dev->dev_private;
 139         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 140
 141         if (crtc && priv->crtc_funcs[pipe] &&
 142             priv->crtc_funcs[pipe]->enable_vblank)
 143                 priv->crtc_funcs[pipe]->disable_vblank(crtc);
 144 }
 145
 146 static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
 147 {
 148         struct rockchip_drm_private *private;
 149         struct device *dev = drm_dev->dev;
 150         struct drm_connector *connector;
 151         struct iommu_group *group;
 152         int ret;
 153
 154         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 155         if (!private)
 156                 return -ENOMEM;
 157
 158         mutex_init(&private->commit.lock);
 159         INIT_WORK(&private->commit.work, rockchip_drm_atomic_work);
 160
 161         drm_dev->dev_private = private;
 162
 163 #ifdef CONFIG_DRM_DMA_SYNC
 164         private->cpu_fence_context = fence_context_alloc(1);
 165         atomic_set(&private->cpu_fence_seqno, 0);
 166 #endif
 167
 168         drm_mode_config_init(drm_dev);
 169
 170         rockchip_drm_mode_config_init(drm_dev);
 171
 172         dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 173                                       GFP_KERNEL);
 174         if (!dev->dma_parms) {
 175                 ret = -ENOMEM;
 176                 goto err_config_cleanup;
 177         }
 178
 179         private->domain = iommu_domain_alloc(&platform_bus_type);
 180         if (!private->domain)
 181                 return -ENOMEM;
 182
 183         ret = iommu_get_dma_cookie(private->domain);
 184         if (ret)
 185                 goto err_free_domain;
 186
 187         group = iommu_group_get(dev);
 188         if (!group) {
 189                 group = iommu_group_alloc();
 190                 if (IS_ERR(group)) {
 191                         dev_err(dev, "Failed to allocate IOMMU group\n");
 192                         goto err_put_cookie;
 193                 }
 194
 195                 ret = iommu_group_add_device(group, dev);
 196                 iommu_group_put(group);
 197                 if (ret) {
 198                         dev_err(dev, "failed to add device to IOMMU group\n");
 199                         goto err_put_cookie;
 200                 }
 201         }
 202         /*
 203          * Attach virtual iommu device, sub iommu device can share the same
 204          * mapping with it.
 205          */
 206         ret = rockchip_drm_dma_attach_device(drm_dev, dev);
 207         if (ret)
 208                 goto err_group_remove_device;
 209
 210         /* Try to bind all sub drivers. */
 211         ret = component_bind_all(dev, drm_dev);
 212         if (ret)
 213                 goto err_detach_device;
 214
 215         /*
 216          * All components are now added, we can publish the connector sysfs
 217          * entries to userspace.  This will generate hotplug events and so
 218          * userspace will expect to be able to access DRM at this point.
 219          */
 220         list_for_each_entry(connector, &drm_dev->mode_config.connector_list,
 221                         head) {
 222                 ret = drm_connector_register(connector);
 223                 if (ret) {
 224                         dev_err(drm_dev->dev,
 225                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
 226                                 connector->base.id,
 227                                 connector->name, ret);
 228                         goto err_unbind;
 229                 }
 230         }
 231
 232         /* init kms poll for handling hpd */
 233         drm_kms_helper_poll_init(drm_dev);
 234
 235         /*
 236          * enable drm irq mode.
 237          * - with irq_enabled = true, we can use the vblank feature.
 238          */
 239         drm_dev->irq_enabled = true;
 240
 241         ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
 242         if (ret)
 243                 goto err_kms_helper_poll_fini;
 244
 245         /*
 246          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 247          * by drm timer once a current process gives up ownership of
 248          * vblank event.(after drm_vblank_put function is called)
 249          */
 250         drm_dev->vblank_disable_allowed = true;
 251
 252         drm_mode_config_reset(drm_dev);
 253
 254         ret = rockchip_drm_fbdev_init(drm_dev);
 255         if (ret)
 256                 goto err_vblank_cleanup;
 257
 258         return 0;
 259 err_vblank_cleanup:
 260         drm_vblank_cleanup(drm_dev);
 261 err_kms_helper_poll_fini:
 262         drm_kms_helper_poll_fini(drm_dev);
 263 err_unbind:
 264         component_unbind_all(dev, drm_dev);
 265 err_detach_device:
 266         rockchip_drm_dma_detach_device(drm_dev, dev);
 267 err_group_remove_device:
 268         iommu_group_remove_device(dev);
 269 err_put_cookie:
 270         iommu_put_dma_cookie(private->domain);
 271 err_free_domain:
 272         iommu_domain_free(private->domain);
 273 err_config_cleanup:
 274         drm_mode_config_cleanup(drm_dev);
 275         drm_dev->dev_private = NULL;
 276         return ret;
 277 }
 278
 279 static int rockchip_drm_unload(struct drm_device *drm_dev)
 280 {
 281         struct device *dev = drm_dev->dev;
 282         struct rockchip_drm_private *private = drm_dev->dev_private;
 283
 284         rockchip_drm_fbdev_fini(drm_dev);
 285         drm_vblank_cleanup(drm_dev);
 286         drm_kms_helper_poll_fini(drm_dev);
 287         component_unbind_all(dev, drm_dev);
 288         rockchip_drm_dma_detach_device(drm_dev, dev);
 289         iommu_group_remove_device(dev);
 290         iommu_put_dma_cookie(private->domain);
 291         iommu_domain_free(private->domain);
 292         drm_mode_config_cleanup(drm_dev);
 293         drm_dev->dev_private = NULL;
 294
 295         return 0;
 296 }
 297
 298 static void rockchip_drm_crtc_cancel_pending_vblank(struct drm_crtc *crtc,
 299                                                     struct drm_file *file_priv)
 300 {
 301         struct rockchip_drm_private *priv = crtc->dev->dev_private;
 302         int pipe = drm_crtc_index(crtc);
 303
 304         if (pipe < ROCKCHIP_MAX_CRTC &&
 305             priv->crtc_funcs[pipe] &&
 306             priv->crtc_funcs[pipe]->cancel_pending_vblank)
 307                 priv->crtc_funcs[pipe]->cancel_pending_vblank(crtc, file_priv);
 308 }
 309
 310 static int rockchip_drm_open(struct drm_device *dev, struct drm_file *file)
 311 {
 312         struct rockchip_drm_file_private *file_priv;
 313
 314         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
 315         if (!file_priv)
 316                 return -ENOMEM;
 317         INIT_LIST_HEAD(&file_priv->gem_cpu_acquire_list);
 318
 319         file->driver_priv = file_priv;
 320
 321         return 0;
 322 }
 323
 324 static void rockchip_drm_preclose(struct drm_device *dev,
 325                                   struct drm_file *file_priv)
 326 {
 327         struct rockchip_drm_file_private *file_private = file_priv->driver_priv;
 328         struct rockchip_gem_object_node *cur, *d;
 329         struct drm_crtc *crtc;
 330
 331         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 332                 rockchip_drm_crtc_cancel_pending_vblank(crtc, file_priv);
 333
 334         mutex_lock(&dev->struct_mutex);
 335         list_for_each_entry_safe(cur, d,
 336                         &file_private->gem_cpu_acquire_list, list) {
 337 #ifdef CONFIG_DRM_DMA_SYNC
 338                 BUG_ON(!cur->rockchip_gem_obj->acquire_fence);
 339                 drm_fence_signal_and_put(&cur->rockchip_gem_obj->acquire_fence);
 340 #endif
 341                 drm_gem_object_unreference(&cur->rockchip_gem_obj->base);
 342                 kfree(cur);
 343         }
 344         /* since we are deleting the whole list, just initialize the header
 345          * instead of calling list_del for every element
 346          */
 347         INIT_LIST_HEAD(&file_private->gem_cpu_acquire_list);
 348         mutex_unlock(&dev->struct_mutex);
 349 }
 350
 351 static void rockchip_drm_postclose(struct drm_device *dev, struct drm_file *file)
 352 {
 353         kfree(file->driver_priv);
 354         file->driver_priv = NULL;
 355 }
 356
 357 void rockchip_drm_lastclose(struct drm_device *dev)
 358 {
 359         struct rockchip_drm_private *priv = dev->dev_private;
 360
 361         drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 362 }
 363
 364 static const struct drm_ioctl_desc rockchip_ioctls[] = {
 365         DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_CREATE, rockchip_gem_create_ioctl,
 366                           DRM_UNLOCKED | DRM_AUTH),
 367         DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_MAP_OFFSET,
 368                           rockchip_gem_map_offset_ioctl,
 369                           DRM_UNLOCKED | DRM_AUTH),
 370         DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_CPU_ACQUIRE,
 371                           rockchip_gem_cpu_acquire_ioctl,
 372                           DRM_UNLOCKED | DRM_AUTH),
 373         DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_CPU_RELEASE,
 374                           rockchip_gem_cpu_release_ioctl,
 375                           DRM_UNLOCKED | DRM_AUTH),
 376 };
 377
 378 static const struct file_operations rockchip_drm_driver_fops = {
 379         .owner = THIS_MODULE,
 380         .open = drm_open,
 381         .mmap = rockchip_gem_mmap,
 382         .poll = drm_poll,
 383         .read = drm_read,
 384         .unlocked_ioctl = drm_ioctl,
 385 #ifdef CONFIG_COMPAT
 386         .compat_ioctl = drm_compat_ioctl,
 387 #endif
 388         .release = drm_release,
 389 };
 390
 391 const struct vm_operations_struct rockchip_drm_vm_ops = {
 392         .open = drm_gem_vm_open,
 393         .close = drm_gem_vm_close,
 394 };
 395
 396 static struct drm_driver rockchip_drm_driver = {
 397         .driver_features        = DRIVER_MODESET | DRIVER_GEM |
 398                                   DRIVER_PRIME | DRIVER_ATOMIC,
 399         .load                   = rockchip_drm_load,
 400         .unload                 = rockchip_drm_unload,
 401         .preclose               = rockchip_drm_preclose,
 402         .lastclose              = rockchip_drm_lastclose,
 403         .get_vblank_counter     = drm_vblank_no_hw_counter,
 404         .open                   = rockchip_drm_open,
 405         .postclose              = rockchip_drm_postclose,
 406         .enable_vblank          = rockchip_drm_crtc_enable_vblank,
 407         .disable_vblank         = rockchip_drm_crtc_disable_vblank,
 408         .gem_vm_ops             = &rockchip_drm_vm_ops,
 409         .gem_free_object        = rockchip_gem_free_object,
 410         .dumb_create            = rockchip_gem_dumb_create,
 411         .dumb_map_offset        = rockchip_gem_dumb_map_offset,
 412         .dumb_destroy           = drm_gem_dumb_destroy,
 413         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 414         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 415         .gem_prime_import       = drm_gem_prime_import,
 416         .gem_prime_export       = drm_gem_prime_export,
 417         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 418         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 419         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 420         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 421         .ioctls                 = rockchip_ioctls,
 422         .num_ioctls             = ARRAY_SIZE(rockchip_ioctls),
 423         .fops                   = &rockchip_drm_driver_fops,
 424         .name   = DRIVER_NAME,
 425         .desc   = DRIVER_DESC,
 426         .date   = DRIVER_DATE,
 427         .major  = DRIVER_MAJOR,
 428         .minor  = DRIVER_MINOR,
 429 };
 430
 431 #ifdef CONFIG_PM_SLEEP
 432 static int rockchip_drm_sys_suspend(struct device *dev)
 433 {
 434         struct drm_device *drm = dev_get_drvdata(dev);
 435         struct drm_connector *connector;
 436
 437         if (!drm)
 438                 return 0;
 439
 440         drm_modeset_lock_all(drm);
 441         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 442                 int old_dpms = connector->dpms;
 443
 444                 if (connector->funcs->dpms)
 445                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 446
 447                 /* Set the old mode back to the connector for resume */
 448                 connector->dpms = old_dpms;
 449         }
 450         drm_modeset_unlock_all(drm);
 451
 452         return 0;
 453 }
 454
 455 static int rockchip_drm_sys_resume(struct device *dev)
 456 {
 457         struct drm_device *drm = dev_get_drvdata(dev);
 458         struct drm_connector *connector;
 459         enum drm_connector_status status;
 460         bool changed = false;
 461
 462         if (!drm)
 463                 return 0;
 464
 465         drm_modeset_lock_all(drm);
 466         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 467                 int desired_mode = connector->dpms;
 468
 469                 /*
 470                  * at suspend time, we save dpms to connector->dpms,
 471                  * restore the old_dpms, and at current time, the connector
 472                  * dpms status must be DRM_MODE_DPMS_OFF.
 473                  */
 474                 connector->dpms = DRM_MODE_DPMS_OFF;
 475
 476                 /*
 477                  * If the connector has been disconnected during suspend,
 478                  * disconnect it from the encoder and leave it off. We'll notify
 479                  * userspace at the end.
 480                  */
 481                 if (desired_mode == DRM_MODE_DPMS_ON) {
 482                         status = connector->funcs->detect(connector, true);
 483                         if (status == connector_status_disconnected) {
 484                                 connector->encoder = NULL;
 485                                 connector->status = status;
 486                                 changed = true;
 487                                 continue;
 488                         }
 489                 }
 490                 if (connector->funcs->dpms)
 491                         connector->funcs->dpms(connector, desired_mode);
 492         }
 493         drm_modeset_unlock_all(drm);
 494
 495         drm_helper_resume_force_mode(drm);
 496
 497         if (changed)
 498                 drm_kms_helper_hotplug_event(drm);
 499
 500         return 0;
 501 }
 502 #endif
 503
 504 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 505         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 506                                 rockchip_drm_sys_resume)
 507 };
 508
 509 /*
 510  * @node: device tree node containing encoder input ports
 511  * @encoder: drm_encoder
 512  */
 513 int rockchip_drm_encoder_get_mux_id(struct device_node *node,
 514                                     struct drm_encoder *encoder)
 515 {
 516         struct device_node *ep;
 517         struct drm_crtc *crtc = encoder->crtc;
 518         struct of_endpoint endpoint;
 519         struct device_node *port;
 520         int ret;
 521
 522         if (!node || !crtc)
 523                 return -EINVAL;
 524
 525         for_each_endpoint_of_node(node, ep) {
 526                 port = of_graph_get_remote_port(ep);
 527                 of_node_put(port);
 528                 if (port == crtc->port) {
 529                         ret = of_graph_parse_endpoint(ep, &endpoint);
 530                         of_node_put(ep);
 531                         return ret ?: endpoint.id;
 532                 }
 533         }
 534
 535         return -EINVAL;
 536 }
 537 EXPORT_SYMBOL_GPL(rockchip_drm_encoder_get_mux_id);
 538
 539 static int compare_of(struct device *dev, void *data)
 540 {
 541         struct device_node *np = data;
 542
 543         return dev->of_node == np;
 544 }
 545
 546 static void rockchip_add_endpoints(struct device *dev,
 547                                    struct component_match **match,
 548                                    struct device_node *port)
 549 {
 550         struct device_node *ep, *remote;
 551
 552         for_each_child_of_node(port, ep) {
 553                 remote = of_graph_get_remote_port_parent(ep);
 554                 if (!remote || !of_device_is_available(remote)) {
 555                         of_node_put(remote);
 556                         continue;
 557                 } else if (!of_device_is_available(remote->parent)) {
 558                         dev_warn(dev, "parent device of %s is not available\n",
 559                                  remote->full_name);
 560                         of_node_put(remote);
 561                         continue;
 562                 }
 563
 564                 component_match_add(dev, match, compare_of, remote);
 565                 of_node_put(remote);
 566         }
 567 }
 568
 569 static int rockchip_drm_bind(struct device *dev)
 570 {
 571         struct drm_device *drm;
 572         int ret;
 573
 574         drm = drm_dev_alloc(&rockchip_drm_driver, dev);
 575         if (!drm)
 576                 return -ENOMEM;
 577
 578         ret = drm_dev_set_unique(drm, "%s", dev_name(dev));
 579         if (ret)
 580                 goto err_free;
 581
 582         ret = drm_dev_register(drm, 0);
 583         if (ret)
 584                 goto err_free;
 585
 586         dev_set_drvdata(dev, drm);
 587
 588         return 0;
 589
 590 err_free:
 591         drm_dev_unref(drm);
 592         return ret;
 593 }
 594
 595 static void rockchip_drm_unbind(struct device *dev)
 596 {
 597         struct drm_device *drm = dev_get_drvdata(dev);
 598
 599         drm_dev_unregister(drm);
 600         drm_dev_unref(drm);
 601         dev_set_drvdata(dev, NULL);
 602 }
 603
 604 static const struct component_master_ops rockchip_drm_ops = {
 605         .bind = rockchip_drm_bind,
 606         .unbind = rockchip_drm_unbind,
 607 };
 608
 609 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 610 {
 611         struct device *dev = &pdev->dev;
 612         struct component_match *match = NULL;
 613         struct device_node *np = dev->of_node;
 614         struct device_node *port;
 615         int i;
 616
 617         if (!np)
 618                 return -ENODEV;
 619         /*
 620          * Bind the crtc ports first, so that
 621          * drm_of_find_possible_crtcs called from encoder .bind callbacks
 622          * works as expected.
 623          */
 624         for (i = 0;; i++) {
 625                 port = of_parse_phandle(np, "ports", i);
 626                 if (!port)
 627                         break;
 628
 629                 if (!of_device_is_available(port->parent)) {
 630                         of_node_put(port);
 631                         continue;
 632                 }
 633
 634                 component_match_add(dev, &match, compare_of, port->parent);
 635                 of_node_put(port);
 636         }
 637
 638         if (i == 0) {
 639                 dev_err(dev, "missing 'ports' property\n");
 640                 return -ENODEV;
 641         }
 642
 643         if (!match) {
 644                 dev_err(dev, "No available vop found for display-subsystem.\n");
 645                 return -ENODEV;
 646         }
 647         /*
 648          * For each bound crtc, bind the encoders attached to its
 649          * remote endpoint.
 650          */
 651         for (i = 0;; i++) {
 652                 port = of_parse_phandle(np, "ports", i);
 653                 if (!port)
 654                         break;
 655
 656                 if (!of_device_is_available(port->parent)) {
 657                         of_node_put(port);
 658                         continue;
 659                 }
 660
 661                 rockchip_add_endpoints(dev, &match, port);
 662                 of_node_put(port);
 663         }
 664
 665         return component_master_add_with_match(dev, &rockchip_drm_ops, match);
 666 }
 667
 668 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 669 {
 670         component_master_del(&pdev->dev, &rockchip_drm_ops);
 671
 672         return 0;
 673 }
 674
 675 static const struct of_device_id rockchip_drm_dt_ids[] = {
 676         { .compatible = "rockchip,display-subsystem", },
 677         { /* sentinel */ },
 678 };
 679 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 680
 681 static struct platform_driver rockchip_drm_platform_driver = {
 682         .probe = rockchip_drm_platform_probe,
 683         .remove = rockchip_drm_platform_remove,
 684         .driver = {
 685                 .name = "rockchip-drm",
 686                 .of_match_table = rockchip_drm_dt_ids,
 687                 .pm = &rockchip_drm_pm_ops,
 688         },
 689 };
 690
 691 module_platform_driver(rockchip_drm_platform_driver);
 692
 693 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 694 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 695 MODULE_LICENSE("GPL v2");