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 static LIST_HEAD(rockchip_drm_subdrv_list);
  44 static DEFINE_MUTEX(subdrv_list_mutex);
  45
  46 /*
  47  * Attach a (component) device to the shared drm dma mapping from master drm
  48  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  49  * mapping.
  50  */
  51 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  52                                    struct device *dev)
  53 {
  54         struct rockchip_drm_private *private = drm_dev->dev_private;
  55         struct iommu_domain *domain = private->domain;
  56         int ret;
  57
  58         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
  59         if (ret)
  60                 return ret;
  61
  62         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
  63         ret = iommu_attach_device(domain, dev);
  64         if (ret) {
  65                 dev_err(dev, "Failed to attach iommu device\n");
  66                 return ret;
  67         }
  68
  69         if (!common_iommu_setup_dma_ops(dev, 0x10000000, SZ_2G, domain->ops)) {
  70                 dev_err(dev, "Failed to set dma_ops\n");
  71                 iommu_detach_device(domain, dev);
  72                 ret = -ENODEV;
  73         }
  74
  75         return ret;
  76 }
  77
  78 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  79                                     struct device *dev)
  80 {
  81         struct rockchip_drm_private *private = drm_dev->dev_private;
  82         struct iommu_domain *domain = private->domain;
  83
  84         iommu_detach_device(domain, dev);
  85 }
  86
  87 int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
  88                                  const struct rockchip_crtc_funcs *crtc_funcs)
  89 {
  90         int pipe = drm_crtc_index(crtc);
  91         struct rockchip_drm_private *priv = crtc->dev->dev_private;
  92
  93         if (pipe > ROCKCHIP_MAX_CRTC)
  94                 return -EINVAL;
  95
  96         priv->crtc_funcs[pipe] = crtc_funcs;
  97
  98         return 0;
  99 }
 100
 101 void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
 102 {
 103         int pipe = drm_crtc_index(crtc);
 104         struct rockchip_drm_private *priv = crtc->dev->dev_private;
 105
 106         if (pipe > ROCKCHIP_MAX_CRTC)
 107                 return;
 108
 109         priv->crtc_funcs[pipe] = NULL;
 110 }
 111
 112 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
 113                                                 int pipe)
 114 {
 115         struct drm_crtc *crtc;
 116         int i = 0;
 117
 118         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 119                 if (i++ == pipe)
 120                         return crtc;
 121
 122         return NULL;
 123 }
 124
 125 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
 126                                            unsigned int pipe)
 127 {
 128         struct rockchip_drm_private *priv = dev->dev_private;
 129         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 130
 131         if (crtc && priv->crtc_funcs[pipe] &&
 132             priv->crtc_funcs[pipe]->enable_vblank)
 133                 return priv->crtc_funcs[pipe]->enable_vblank(crtc);
 134
 135         return 0;
 136 }
 137
 138 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
 139                                              unsigned int pipe)
 140 {
 141         struct rockchip_drm_private *priv = dev->dev_private;
 142         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 143
 144         if (crtc && priv->crtc_funcs[pipe] &&
 145             priv->crtc_funcs[pipe]->enable_vblank)
 146                 priv->crtc_funcs[pipe]->disable_vblank(crtc);
 147 }
 148
 149 static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
 150 {
 151         struct rockchip_drm_private *private;
 152         struct device *dev = drm_dev->dev;
 153         struct drm_connector *connector;
 154         struct iommu_group *group;
 155         int ret;
 156
 157         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 158         if (!private)
 159                 return -ENOMEM;
 160
 161         mutex_init(&private->commit.lock);
 162         INIT_WORK(&private->commit.work, rockchip_drm_atomic_work);
 163
 164         drm_dev->dev_private = private;
 165
 166 #ifdef CONFIG_DRM_DMA_SYNC
 167         private->cpu_fence_context = fence_context_alloc(1);
 168         atomic_set(&private->cpu_fence_seqno, 0);
 169 #endif
 170
 171         drm_mode_config_init(drm_dev);
 172
 173         rockchip_drm_mode_config_init(drm_dev);
 174
 175         dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 176                                       GFP_KERNEL);
 177         if (!dev->dma_parms) {
 178                 ret = -ENOMEM;
 179                 goto err_config_cleanup;
 180         }
 181
 182         private->domain = iommu_domain_alloc(&platform_bus_type);
 183         if (!private->domain)
 184                 return -ENOMEM;
 185
 186         ret = iommu_get_dma_cookie(private->domain);
 187         if (ret)
 188                 goto err_free_domain;
 189
 190         group = iommu_group_get(dev);
 191         if (!group) {
 192                 group = iommu_group_alloc();
 193                 if (IS_ERR(group)) {
 194                         dev_err(dev, "Failed to allocate IOMMU group\n");
 195                         goto err_put_cookie;
 196                 }
 197
 198                 ret = iommu_group_add_device(group, dev);
 199                 iommu_group_put(group);
 200                 if (ret) {
 201                         dev_err(dev, "failed to add device to IOMMU group\n");
 202                         goto err_put_cookie;
 203                 }
 204         }
 205         /*
 206          * Attach virtual iommu device, sub iommu device can share the same
 207          * mapping with it.
 208          */
 209         ret = rockchip_drm_dma_attach_device(drm_dev, dev);
 210         if (ret)
 211                 goto err_group_remove_device;
 212
 213         /* Try to bind all sub drivers. */
 214         ret = component_bind_all(dev, drm_dev);
 215         if (ret)
 216                 goto err_detach_device;
 217
 218         /*
 219          * All components are now added, we can publish the connector sysfs
 220          * entries to userspace.  This will generate hotplug events and so
 221          * userspace will expect to be able to access DRM at this point.
 222          */
 223         list_for_each_entry(connector, &drm_dev->mode_config.connector_list,
 224                         head) {
 225                 ret = drm_connector_register(connector);
 226                 if (ret) {
 227                         dev_err(drm_dev->dev,
 228                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
 229                                 connector->base.id,
 230                                 connector->name, ret);
 231                         goto err_unbind;
 232                 }
 233         }
 234
 235         /* init kms poll for handling hpd */
 236         drm_kms_helper_poll_init(drm_dev);
 237
 238         /*
 239          * enable drm irq mode.
 240          * - with irq_enabled = true, we can use the vblank feature.
 241          */
 242         drm_dev->irq_enabled = true;
 243
 244         ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
 245         if (ret)
 246                 goto err_kms_helper_poll_fini;
 247
 248         /*
 249          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 250          * by drm timer once a current process gives up ownership of
 251          * vblank event.(after drm_vblank_put function is called)
 252          */
 253         drm_dev->vblank_disable_allowed = true;
 254
 255         drm_mode_config_reset(drm_dev);
 256
 257         ret = rockchip_drm_fbdev_init(drm_dev);
 258         if (ret)
 259                 goto err_vblank_cleanup;
 260
 261         return 0;
 262 err_vblank_cleanup:
 263         drm_vblank_cleanup(drm_dev);
 264 err_kms_helper_poll_fini:
 265         drm_kms_helper_poll_fini(drm_dev);
 266 err_unbind:
 267         component_unbind_all(dev, drm_dev);
 268 err_detach_device:
 269         rockchip_drm_dma_detach_device(drm_dev, dev);
 270 err_group_remove_device:
 271         iommu_group_remove_device(dev);
 272 err_put_cookie:
 273         iommu_put_dma_cookie(private->domain);
 274 err_free_domain:
 275         iommu_domain_free(private->domain);
 276 err_config_cleanup:
 277         drm_mode_config_cleanup(drm_dev);
 278         drm_dev->dev_private = NULL;
 279         return ret;
 280 }
 281
 282 static int rockchip_drm_unload(struct drm_device *drm_dev)
 283 {
 284         struct device *dev = drm_dev->dev;
 285         struct rockchip_drm_private *private = drm_dev->dev_private;
 286
 287         rockchip_drm_fbdev_fini(drm_dev);
 288         drm_vblank_cleanup(drm_dev);
 289         drm_kms_helper_poll_fini(drm_dev);
 290         component_unbind_all(dev, drm_dev);
 291         rockchip_drm_dma_detach_device(drm_dev, dev);
 292         iommu_group_remove_device(dev);
 293         iommu_put_dma_cookie(private->domain);
 294         iommu_domain_free(private->domain);
 295         drm_mode_config_cleanup(drm_dev);
 296         drm_dev->dev_private = NULL;
 297
 298         return 0;
 299 }
 300
 301 static void rockchip_drm_crtc_cancel_pending_vblank(struct drm_crtc *crtc,
 302                                                     struct drm_file *file_priv)
 303 {
 304         struct rockchip_drm_private *priv = crtc->dev->dev_private;
 305         int pipe = drm_crtc_index(crtc);
 306
 307         if (pipe < ROCKCHIP_MAX_CRTC &&
 308             priv->crtc_funcs[pipe] &&
 309             priv->crtc_funcs[pipe]->cancel_pending_vblank)
 310                 priv->crtc_funcs[pipe]->cancel_pending_vblank(crtc, file_priv);
 311 }
 312
 313 int rockchip_drm_register_subdrv(struct drm_rockchip_subdrv *subdrv)
 314 {
 315         if (!subdrv)
 316                 return -EINVAL;
 317
 318         mutex_lock(&subdrv_list_mutex);
 319         list_add_tail(&subdrv->list, &rockchip_drm_subdrv_list);
 320         mutex_unlock(&subdrv_list_mutex);
 321
 322         return 0;
 323 }
 324 EXPORT_SYMBOL_GPL(rockchip_drm_register_subdrv);
 325
 326 int rockchip_drm_unregister_subdrv(struct drm_rockchip_subdrv *subdrv)
 327 {
 328         if (!subdrv)
 329                 return -EINVAL;
 330
 331         mutex_lock(&subdrv_list_mutex);
 332         list_del(&subdrv->list);
 333         mutex_unlock(&subdrv_list_mutex);
 334
 335         return 0;
 336 }
 337 EXPORT_SYMBOL_GPL(rockchip_drm_unregister_subdrv);
 338
 339 static int rockchip_drm_open(struct drm_device *dev, struct drm_file *file)
 340 {
 341         struct rockchip_drm_file_private *file_priv;
 342         struct drm_rockchip_subdrv *subdrv;
 343         int ret = 0;
 344
 345         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
 346         if (!file_priv)
 347                 return -ENOMEM;
 348         INIT_LIST_HEAD(&file_priv->gem_cpu_acquire_list);
 349
 350         file->driver_priv = file_priv;
 351
 352         mutex_lock(&subdrv_list_mutex);
 353         list_for_each_entry(subdrv, &rockchip_drm_subdrv_list, list) {
 354                 ret = subdrv->open(dev, subdrv->dev, file);
 355                 if (ret) {
 356                         mutex_unlock(&subdrv_list_mutex);
 357                         goto err_free_file_priv;
 358                 }
 359         }
 360         mutex_unlock(&subdrv_list_mutex);
 361
 362         return 0;
 363
 364 err_free_file_priv:
 365         kfree(file_priv);
 366         file_priv = NULL;
 367
 368         return ret;
 369 }
 370
 371 static void rockchip_drm_preclose(struct drm_device *dev,
 372                                   struct drm_file *file_priv)
 373 {
 374         struct rockchip_drm_file_private *file_private = file_priv->driver_priv;
 375         struct rockchip_gem_object_node *cur, *d;
 376         struct drm_rockchip_subdrv *subdrv;
 377         struct drm_crtc *crtc;
 378
 379         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 380                 rockchip_drm_crtc_cancel_pending_vblank(crtc, file_priv);
 381
 382         mutex_lock(&dev->struct_mutex);
 383         list_for_each_entry_safe(cur, d,
 384                         &file_private->gem_cpu_acquire_list, list) {
 385 #ifdef CONFIG_DRM_DMA_SYNC
 386                 BUG_ON(!cur->rockchip_gem_obj->acquire_fence);
 387                 drm_fence_signal_and_put(&cur->rockchip_gem_obj->acquire_fence);
 388 #endif
 389                 drm_gem_object_unreference(&cur->rockchip_gem_obj->base);
 390                 kfree(cur);
 391         }
 392         /* since we are deleting the whole list, just initialize the header
 393          * instead of calling list_del for every element
 394          */
 395         INIT_LIST_HEAD(&file_private->gem_cpu_acquire_list);
 396         mutex_unlock(&dev->struct_mutex);
 397
 398         mutex_lock(&subdrv_list_mutex);
 399         list_for_each_entry(subdrv, &rockchip_drm_subdrv_list, list)
 400                 subdrv->close(dev, subdrv->dev, file_priv);
 401         mutex_unlock(&subdrv_list_mutex);
 402 }
 403
 404 static void rockchip_drm_postclose(struct drm_device *dev, struct drm_file *file)
 405 {
 406         kfree(file->driver_priv);
 407         file->driver_priv = NULL;
 408 }
 409
 410 void rockchip_drm_lastclose(struct drm_device *dev)
 411 {
 412         struct rockchip_drm_private *priv = dev->dev_private;
 413
 414         drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 415 }
 416
 417 static const struct drm_ioctl_desc rockchip_ioctls[] = {
 418         DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_CREATE, rockchip_gem_create_ioctl,
 419                           DRM_UNLOCKED | DRM_AUTH),
 420         DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_MAP_OFFSET,
 421                           rockchip_gem_map_offset_ioctl,
 422                           DRM_UNLOCKED | DRM_AUTH),
 423         DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_CPU_ACQUIRE,
 424                           rockchip_gem_cpu_acquire_ioctl,
 425                           DRM_UNLOCKED | DRM_AUTH),
 426         DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_CPU_RELEASE,
 427                           rockchip_gem_cpu_release_ioctl,
 428                           DRM_UNLOCKED | DRM_AUTH),
 429 };
 430
 431 static const struct file_operations rockchip_drm_driver_fops = {
 432         .owner = THIS_MODULE,
 433         .open = drm_open,
 434         .mmap = rockchip_gem_mmap,
 435         .poll = drm_poll,
 436         .read = drm_read,
 437         .unlocked_ioctl = drm_ioctl,
 438 #ifdef CONFIG_COMPAT
 439         .compat_ioctl = drm_compat_ioctl,
 440 #endif
 441         .release = drm_release,
 442 };
 443
 444 const struct vm_operations_struct rockchip_drm_vm_ops = {
 445         .open = drm_gem_vm_open,
 446         .close = drm_gem_vm_close,
 447 };
 448
 449 static struct drm_driver rockchip_drm_driver = {
 450         .driver_features        = DRIVER_MODESET | DRIVER_GEM |
 451                                   DRIVER_PRIME | DRIVER_ATOMIC,
 452         .load                   = rockchip_drm_load,
 453         .unload                 = rockchip_drm_unload,
 454         .preclose               = rockchip_drm_preclose,
 455         .lastclose              = rockchip_drm_lastclose,
 456         .get_vblank_counter     = drm_vblank_no_hw_counter,
 457         .open                   = rockchip_drm_open,
 458         .postclose              = rockchip_drm_postclose,
 459         .enable_vblank          = rockchip_drm_crtc_enable_vblank,
 460         .disable_vblank         = rockchip_drm_crtc_disable_vblank,
 461         .gem_vm_ops             = &rockchip_drm_vm_ops,
 462         .gem_free_object        = rockchip_gem_free_object,
 463         .dumb_create            = rockchip_gem_dumb_create,
 464         .dumb_map_offset        = rockchip_gem_dumb_map_offset,
 465         .dumb_destroy           = drm_gem_dumb_destroy,
 466         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 467         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 468         .gem_prime_import       = drm_gem_prime_import,
 469         .gem_prime_export       = drm_gem_prime_export,
 470         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 471         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 472         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 473         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 474         .ioctls                 = rockchip_ioctls,
 475         .num_ioctls             = ARRAY_SIZE(rockchip_ioctls),
 476         .fops                   = &rockchip_drm_driver_fops,
 477         .name   = DRIVER_NAME,
 478         .desc   = DRIVER_DESC,
 479         .date   = DRIVER_DATE,
 480         .major  = DRIVER_MAJOR,
 481         .minor  = DRIVER_MINOR,
 482 };
 483
 484 #ifdef CONFIG_PM_SLEEP
 485 static int rockchip_drm_sys_suspend(struct device *dev)
 486 {
 487         struct drm_device *drm = dev_get_drvdata(dev);
 488         struct drm_connector *connector;
 489
 490         if (!drm)
 491                 return 0;
 492
 493         drm_modeset_lock_all(drm);
 494         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 495                 int old_dpms = connector->dpms;
 496
 497                 if (connector->funcs->dpms)
 498                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 499
 500                 /* Set the old mode back to the connector for resume */
 501                 connector->dpms = old_dpms;
 502         }
 503         drm_modeset_unlock_all(drm);
 504
 505         return 0;
 506 }
 507
 508 static int rockchip_drm_sys_resume(struct device *dev)
 509 {
 510         struct drm_device *drm = dev_get_drvdata(dev);
 511         struct drm_connector *connector;
 512         enum drm_connector_status status;
 513         bool changed = false;
 514
 515         if (!drm)
 516                 return 0;
 517
 518         drm_modeset_lock_all(drm);
 519         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 520                 int desired_mode = connector->dpms;
 521
 522                 /*
 523                  * at suspend time, we save dpms to connector->dpms,
 524                  * restore the old_dpms, and at current time, the connector
 525                  * dpms status must be DRM_MODE_DPMS_OFF.
 526                  */
 527                 connector->dpms = DRM_MODE_DPMS_OFF;
 528
 529                 /*
 530                  * If the connector has been disconnected during suspend,
 531                  * disconnect it from the encoder and leave it off. We'll notify
 532                  * userspace at the end.
 533                  */
 534                 if (desired_mode == DRM_MODE_DPMS_ON) {
 535                         status = connector->funcs->detect(connector, true);
 536                         if (status == connector_status_disconnected) {
 537                                 connector->encoder = NULL;
 538                                 connector->status = status;
 539                                 changed = true;
 540                                 continue;
 541                         }
 542                 }
 543                 if (connector->funcs->dpms)
 544                         connector->funcs->dpms(connector, desired_mode);
 545         }
 546         drm_modeset_unlock_all(drm);
 547
 548         drm_helper_resume_force_mode(drm);
 549
 550         if (changed)
 551                 drm_kms_helper_hotplug_event(drm);
 552
 553         return 0;
 554 }
 555 #endif
 556
 557 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 558         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 559                                 rockchip_drm_sys_resume)
 560 };
 561
 562 /*
 563  * @node: device tree node containing encoder input ports
 564  * @encoder: drm_encoder
 565  */
 566 int rockchip_drm_encoder_get_mux_id(struct device_node *node,
 567                                     struct drm_encoder *encoder)
 568 {
 569         struct device_node *ep;
 570         struct drm_crtc *crtc = encoder->crtc;
 571         struct of_endpoint endpoint;
 572         struct device_node *port;
 573         int ret;
 574
 575         if (!node || !crtc)
 576                 return -EINVAL;
 577
 578         for_each_endpoint_of_node(node, ep) {
 579                 port = of_graph_get_remote_port(ep);
 580                 of_node_put(port);
 581                 if (port == crtc->port) {
 582                         ret = of_graph_parse_endpoint(ep, &endpoint);
 583                         of_node_put(ep);
 584                         return ret ?: endpoint.id;
 585                 }
 586         }
 587
 588         return -EINVAL;
 589 }
 590 EXPORT_SYMBOL_GPL(rockchip_drm_encoder_get_mux_id);
 591
 592 static int compare_of(struct device *dev, void *data)
 593 {
 594         struct device_node *np = data;
 595
 596         return dev->of_node == np;
 597 }
 598
 599 static void rockchip_add_endpoints(struct device *dev,
 600                                    struct component_match **match,
 601                                    struct device_node *port)
 602 {
 603         struct device_node *ep, *remote;
 604
 605         for_each_child_of_node(port, ep) {
 606                 remote = of_graph_get_remote_port_parent(ep);
 607                 if (!remote || !of_device_is_available(remote)) {
 608                         of_node_put(remote);
 609                         continue;
 610                 } else if (!of_device_is_available(remote->parent)) {
 611                         dev_warn(dev, "parent device of %s is not available\n",
 612                                  remote->full_name);
 613                         of_node_put(remote);
 614                         continue;
 615                 }
 616
 617                 component_match_add(dev, match, compare_of, remote);
 618                 of_node_put(remote);
 619         }
 620 }
 621
 622 static int rockchip_drm_bind(struct device *dev)
 623 {
 624         struct drm_device *drm;
 625         int ret;
 626
 627         drm = drm_dev_alloc(&rockchip_drm_driver, dev);
 628         if (!drm)
 629                 return -ENOMEM;
 630
 631         ret = drm_dev_set_unique(drm, "%s", dev_name(dev));
 632         if (ret)
 633                 goto err_free;
 634
 635         ret = drm_dev_register(drm, 0);
 636         if (ret)
 637                 goto err_free;
 638
 639         dev_set_drvdata(dev, drm);
 640
 641         return 0;
 642
 643 err_free:
 644         drm_dev_unref(drm);
 645         return ret;
 646 }
 647
 648 static void rockchip_drm_unbind(struct device *dev)
 649 {
 650         struct drm_device *drm = dev_get_drvdata(dev);
 651
 652         drm_dev_unregister(drm);
 653         drm_dev_unref(drm);
 654         dev_set_drvdata(dev, NULL);
 655 }
 656
 657 static const struct component_master_ops rockchip_drm_ops = {
 658         .bind = rockchip_drm_bind,
 659         .unbind = rockchip_drm_unbind,
 660 };
 661
 662 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 663 {
 664         struct device *dev = &pdev->dev;
 665         struct component_match *match = NULL;
 666         struct device_node *np = dev->of_node;
 667         struct device_node *port;
 668         int i;
 669
 670         if (!np)
 671                 return -ENODEV;
 672         /*
 673          * Bind the crtc ports first, so that
 674          * drm_of_find_possible_crtcs called from encoder .bind callbacks
 675          * works as expected.
 676          */
 677         for (i = 0;; i++) {
 678                 port = of_parse_phandle(np, "ports", i);
 679                 if (!port)
 680                         break;
 681
 682                 if (!of_device_is_available(port->parent)) {
 683                         of_node_put(port);
 684                         continue;
 685                 }
 686
 687                 component_match_add(dev, &match, compare_of, port->parent);
 688                 of_node_put(port);
 689         }
 690
 691         if (i == 0) {
 692                 dev_err(dev, "missing 'ports' property\n");
 693                 return -ENODEV;
 694         }
 695
 696         if (!match) {
 697                 dev_err(dev, "No available vop found for display-subsystem.\n");
 698                 return -ENODEV;
 699         }
 700         /*
 701          * For each bound crtc, bind the encoders attached to its
 702          * remote endpoint.
 703          */
 704         for (i = 0;; i++) {
 705                 port = of_parse_phandle(np, "ports", i);
 706                 if (!port)
 707                         break;
 708
 709                 if (!of_device_is_available(port->parent)) {
 710                         of_node_put(port);
 711                         continue;
 712                 }
 713
 714                 rockchip_add_endpoints(dev, &match, port);
 715                 of_node_put(port);
 716         }
 717
 718         return component_master_add_with_match(dev, &rockchip_drm_ops, match);
 719 }
 720
 721 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 722 {
 723         component_master_del(&pdev->dev, &rockchip_drm_ops);
 724
 725         return 0;
 726 }
 727
 728 static const struct of_device_id rockchip_drm_dt_ids[] = {
 729         { .compatible = "rockchip,display-subsystem", },
 730         { /* sentinel */ },
 731 };
 732 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 733
 734 static struct platform_driver rockchip_drm_platform_driver = {
 735         .probe = rockchip_drm_platform_probe,
 736         .remove = rockchip_drm_platform_remove,
 737         .driver = {
 738                 .name = "rockchip-drm",
 739                 .of_match_table = rockchip_drm_dt_ids,
 740                 .pm = &rockchip_drm_pm_ops,
 741         },
 742 };
 743
 744 module_platform_driver(rockchip_drm_platform_driver);
 745
 746 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 747 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 748 MODULE_LICENSE("GPL v2");