drivers/gpu/drm/exynos/exynos_drm_drv.c

   1 /*
   2  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   3  * Authors:
   4  *      Inki Dae <inki.dae@samsung.com>
   5  *      Joonyoung Shim <jy0922.shim@samsung.com>
   6  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/pm_runtime.h>
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_crtc_helper.h>
  19
  20 #include <linux/component.h>
  21
  22 #include <drm/exynos_drm.h>
  23
  24 #include "exynos_drm_drv.h"
  25 #include "exynos_drm_fbdev.h"
  26 #include "exynos_drm_fb.h"
  27 #include "exynos_drm_gem.h"
  28 #include "exynos_drm_plane.h"
  29 #include "exynos_drm_vidi.h"
  30 #include "exynos_drm_g2d.h"
  31 #include "exynos_drm_ipp.h"
  32 #include "exynos_drm_iommu.h"
  33
  34 #define DRIVER_NAME     "exynos"
  35 #define DRIVER_DESC     "Samsung SoC DRM"
  36 #define DRIVER_DATE     "20110530"
  37 #define DRIVER_MAJOR    1
  38 #define DRIVER_MINOR    0
  39
  40 static struct device *exynos_drm_get_dma_device(void);
  41
  42 int exynos_atomic_check(struct drm_device *dev,
  43                         struct drm_atomic_state *state)
  44 {
  45         int ret;
  46
  47         ret = drm_atomic_helper_check_modeset(dev, state);
  48         if (ret)
  49                 return ret;
  50
  51         ret = drm_atomic_normalize_zpos(dev, state);
  52         if (ret)
  53                 return ret;
  54
  55         ret = drm_atomic_helper_check_planes(dev, state);
  56         if (ret)
  57                 return ret;
  58
  59         return ret;
  60 }
  61
  62 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
  63 {
  64         struct drm_exynos_file_private *file_priv;
  65         int ret;
  66
  67         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
  68         if (!file_priv)
  69                 return -ENOMEM;
  70
  71         file->driver_priv = file_priv;
  72
  73         ret = exynos_drm_subdrv_open(dev, file);
  74         if (ret)
  75                 goto err_file_priv_free;
  76
  77         return ret;
  78
  79 err_file_priv_free:
  80         kfree(file_priv);
  81         file->driver_priv = NULL;
  82         return ret;
  83 }
  84
  85 static void exynos_drm_preclose(struct drm_device *dev,
  86                                         struct drm_file *file)
  87 {
  88         exynos_drm_subdrv_close(dev, file);
  89 }
  90
  91 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
  92 {
  93         kfree(file->driver_priv);
  94         file->driver_priv = NULL;
  95 }
  96
  97 static void exynos_drm_lastclose(struct drm_device *dev)
  98 {
  99         exynos_drm_fbdev_restore_mode(dev);
 100 }
 101
 102 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 103         .fault = exynos_drm_gem_fault,
 104         .open = drm_gem_vm_open,
 105         .close = drm_gem_vm_close,
 106 };
 107
 108 static const struct drm_ioctl_desc exynos_ioctls[] = {
 109         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
 110                         DRM_AUTH | DRM_RENDER_ALLOW),
 111         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
 112                         DRM_AUTH | DRM_RENDER_ALLOW),
 113         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
 114                         DRM_RENDER_ALLOW),
 115         DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
 116                         DRM_AUTH),
 117         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
 118                         DRM_AUTH | DRM_RENDER_ALLOW),
 119         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
 120                         DRM_AUTH | DRM_RENDER_ALLOW),
 121         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
 122                         DRM_AUTH | DRM_RENDER_ALLOW),
 123         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property,
 124                         DRM_AUTH | DRM_RENDER_ALLOW),
 125         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property,
 126                         DRM_AUTH | DRM_RENDER_ALLOW),
 127         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf,
 128                         DRM_AUTH | DRM_RENDER_ALLOW),
 129         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl,
 130                         DRM_AUTH | DRM_RENDER_ALLOW),
 131 };
 132
 133 static const struct file_operations exynos_drm_driver_fops = {
 134         .owner          = THIS_MODULE,
 135         .open           = drm_open,
 136         .mmap           = exynos_drm_gem_mmap,
 137         .poll           = drm_poll,
 138         .read           = drm_read,
 139         .unlocked_ioctl = drm_ioctl,
 140         .compat_ioctl = drm_compat_ioctl,
 141         .release        = drm_release,
 142 };
 143
 144 static struct drm_driver exynos_drm_driver = {
 145         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
 146                                   | DRIVER_ATOMIC | DRIVER_RENDER,
 147         .open                   = exynos_drm_open,
 148         .preclose               = exynos_drm_preclose,
 149         .lastclose              = exynos_drm_lastclose,
 150         .postclose              = exynos_drm_postclose,
 151         .gem_free_object_unlocked = exynos_drm_gem_free_object,
 152         .gem_vm_ops             = &exynos_drm_gem_vm_ops,
 153         .dumb_create            = exynos_drm_gem_dumb_create,
 154         .dumb_map_offset        = exynos_drm_gem_dumb_map_offset,
 155         .dumb_destroy           = drm_gem_dumb_destroy,
 156         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 157         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 158         .gem_prime_export       = drm_gem_prime_export,
 159         .gem_prime_import       = drm_gem_prime_import,
 160         .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table,
 161         .gem_prime_import_sg_table      = exynos_drm_gem_prime_import_sg_table,
 162         .gem_prime_vmap         = exynos_drm_gem_prime_vmap,
 163         .gem_prime_vunmap       = exynos_drm_gem_prime_vunmap,
 164         .gem_prime_mmap         = exynos_drm_gem_prime_mmap,
 165         .ioctls                 = exynos_ioctls,
 166         .num_ioctls             = ARRAY_SIZE(exynos_ioctls),
 167         .fops                   = &exynos_drm_driver_fops,
 168         .name   = DRIVER_NAME,
 169         .desc   = DRIVER_DESC,
 170         .date   = DRIVER_DATE,
 171         .major  = DRIVER_MAJOR,
 172         .minor  = DRIVER_MINOR,
 173 };
 174
 175 #ifdef CONFIG_PM_SLEEP
 176 static int exynos_drm_suspend(struct device *dev)
 177 {
 178         struct drm_device *drm_dev = dev_get_drvdata(dev);
 179         struct drm_connector *connector;
 180
 181         if (pm_runtime_suspended(dev) || !drm_dev)
 182                 return 0;
 183
 184         drm_modeset_lock_all(drm_dev);
 185         drm_for_each_connector(connector, drm_dev) {
 186                 int old_dpms = connector->dpms;
 187
 188                 if (connector->funcs->dpms)
 189                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 190
 191                 /* Set the old mode back to the connector for resume */
 192                 connector->dpms = old_dpms;
 193         }
 194         drm_modeset_unlock_all(drm_dev);
 195
 196         return 0;
 197 }
 198
 199 static int exynos_drm_resume(struct device *dev)
 200 {
 201         struct drm_device *drm_dev = dev_get_drvdata(dev);
 202         struct drm_connector *connector;
 203
 204         if (pm_runtime_suspended(dev) || !drm_dev)
 205                 return 0;
 206
 207         drm_modeset_lock_all(drm_dev);
 208         drm_for_each_connector(connector, drm_dev) {
 209                 if (connector->funcs->dpms) {
 210                         int dpms = connector->dpms;
 211
 212                         connector->dpms = DRM_MODE_DPMS_OFF;
 213                         connector->funcs->dpms(connector, dpms);
 214                 }
 215         }
 216         drm_modeset_unlock_all(drm_dev);
 217
 218         return 0;
 219 }
 220 #endif
 221
 222 static const struct dev_pm_ops exynos_drm_pm_ops = {
 223         SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume)
 224 };
 225
 226 /* forward declaration */
 227 static struct platform_driver exynos_drm_platform_driver;
 228
 229 struct exynos_drm_driver_info {
 230         struct platform_driver *driver;
 231         unsigned int flags;
 232 };
 233
 234 #define DRM_COMPONENT_DRIVER    BIT(0)  /* supports component framework */
 235 #define DRM_VIRTUAL_DEVICE      BIT(1)  /* create virtual platform device */
 236 #define DRM_DMA_DEVICE          BIT(2)  /* can be used for dma allocations */
 237
 238 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
 239
 240 /*
 241  * Connector drivers should not be placed before associated crtc drivers,
 242  * because connector requires pipe number of its crtc during initialization.
 243  */
 244 static struct exynos_drm_driver_info exynos_drm_drivers[] = {
 245         {
 246                 DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD),
 247                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
 248         }, {
 249                 DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON),
 250                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
 251         }, {
 252                 DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON),
 253                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
 254         }, {
 255                 DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
 256                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
 257         }, {
 258                 DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
 259                 DRM_COMPONENT_DRIVER
 260         }, {
 261                 DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP),
 262                 DRM_COMPONENT_DRIVER
 263         }, {
 264                 DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI),
 265                 DRM_COMPONENT_DRIVER
 266         }, {
 267                 DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI),
 268                 DRM_COMPONENT_DRIVER
 269         }, {
 270                 DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI),
 271                 DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE
 272         }, {
 273                 DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D),
 274         }, {
 275                 DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC),
 276         }, {
 277                 DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR),
 278         }, {
 279                 DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC),
 280         }, {
 281                 DRV_PTR(ipp_driver, CONFIG_DRM_EXYNOS_IPP),
 282                 DRM_VIRTUAL_DEVICE
 283         }, {
 284                 &exynos_drm_platform_driver,
 285                 DRM_VIRTUAL_DEVICE
 286         }
 287 };
 288
 289 static int compare_dev(struct device *dev, void *data)
 290 {
 291         return dev == (struct device *)data;
 292 }
 293
 294 static struct component_match *exynos_drm_match_add(struct device *dev)
 295 {
 296         struct component_match *match = NULL;
 297         int i;
 298
 299         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
 300                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 301                 struct device *p = NULL, *d;
 302
 303                 if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
 304                         continue;
 305
 306                 while ((d = bus_find_device(&platform_bus_type, p,
 307                                             &info->driver->driver,
 308                                             (void *)platform_bus_type.match))) {
 309                         put_device(p);
 310                         component_match_add(dev, &match, compare_dev, d);
 311                         p = d;
 312                 }
 313                 put_device(p);
 314         }
 315
 316         return match ?: ERR_PTR(-ENODEV);
 317 }
 318
 319 static int exynos_drm_bind(struct device *dev)
 320 {
 321         struct exynos_drm_private *private;
 322         struct drm_encoder *encoder;
 323         struct drm_device *drm;
 324         unsigned int clone_mask;
 325         int cnt, ret;
 326
 327         drm = drm_dev_alloc(&exynos_drm_driver, dev);
 328         if (IS_ERR(drm))
 329                 return PTR_ERR(drm);
 330
 331         private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL);
 332         if (!private) {
 333                 ret = -ENOMEM;
 334                 goto err_free_drm;
 335         }
 336
 337         init_waitqueue_head(&private->wait);
 338         spin_lock_init(&private->lock);
 339
 340         dev_set_drvdata(dev, drm);
 341         drm->dev_private = (void *)private;
 342
 343         /* the first real CRTC device is used for all dma mapping operations */
 344         private->dma_dev = exynos_drm_get_dma_device();
 345         if (!private->dma_dev) {
 346                 DRM_ERROR("no device found for DMA mapping operations.\n");
 347                 ret = -ENODEV;
 348                 goto err_free_private;
 349         }
 350         DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
 351                  dev_name(private->dma_dev));
 352
 353         /* create common IOMMU mapping for all devices attached to Exynos DRM */
 354         ret = drm_create_iommu_mapping(drm);
 355         if (ret < 0) {
 356                 DRM_ERROR("failed to create iommu mapping.\n");
 357                 goto err_free_private;
 358         }
 359
 360         drm_mode_config_init(drm);
 361
 362         exynos_drm_mode_config_init(drm);
 363
 364         /* setup possible_clones. */
 365         cnt = 0;
 366         clone_mask = 0;
 367         list_for_each_entry(encoder, &drm->mode_config.encoder_list, head)
 368                 clone_mask |= (1 << (cnt++));
 369
 370         list_for_each_entry(encoder, &drm->mode_config.encoder_list, head)
 371                 encoder->possible_clones = clone_mask;
 372
 373         /* Try to bind all sub drivers. */
 374         ret = component_bind_all(drm->dev, drm);
 375         if (ret)
 376                 goto err_mode_config_cleanup;
 377
 378         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 379         if (ret)
 380                 goto err_unbind_all;
 381
 382         /* Probe non kms sub drivers and virtual display driver. */
 383         ret = exynos_drm_device_subdrv_probe(drm);
 384         if (ret)
 385                 goto err_cleanup_vblank;
 386
 387         drm_mode_config_reset(drm);
 388
 389         /*
 390          * enable drm irq mode.
 391          * - with irq_enabled = true, we can use the vblank feature.
 392          *
 393          * P.S. note that we wouldn't use drm irq handler but
 394          *      just specific driver own one instead because
 395          *      drm framework supports only one irq handler.
 396          */
 397         drm->irq_enabled = true;
 398
 399         /* init kms poll for handling hpd */
 400         drm_kms_helper_poll_init(drm);
 401
 402         /* force connectors detection */
 403         drm_helper_hpd_irq_event(drm);
 404
 405         /* register the DRM device */
 406         ret = drm_dev_register(drm, 0);
 407         if (ret < 0)
 408                 goto err_cleanup_fbdev;
 409
 410         return 0;
 411
 412 err_cleanup_fbdev:
 413         exynos_drm_fbdev_fini(drm);
 414         drm_kms_helper_poll_fini(drm);
 415         exynos_drm_device_subdrv_remove(drm);
 416 err_cleanup_vblank:
 417         drm_vblank_cleanup(drm);
 418 err_unbind_all:
 419         component_unbind_all(drm->dev, drm);
 420 err_mode_config_cleanup:
 421         drm_mode_config_cleanup(drm);
 422         drm_release_iommu_mapping(drm);
 423 err_free_private:
 424         kfree(private);
 425 err_free_drm:
 426         drm_dev_unref(drm);
 427
 428         return ret;
 429 }
 430
 431 static void exynos_drm_unbind(struct device *dev)
 432 {
 433         struct drm_device *drm = dev_get_drvdata(dev);
 434
 435         drm_dev_unregister(drm);
 436
 437         exynos_drm_device_subdrv_remove(drm);
 438
 439         exynos_drm_fbdev_fini(drm);
 440         drm_kms_helper_poll_fini(drm);
 441
 442         component_unbind_all(drm->dev, drm);
 443         drm_mode_config_cleanup(drm);
 444         drm_release_iommu_mapping(drm);
 445
 446         kfree(drm->dev_private);
 447         drm->dev_private = NULL;
 448
 449         drm_dev_unref(drm);
 450 }
 451
 452 static const struct component_master_ops exynos_drm_ops = {
 453         .bind           = exynos_drm_bind,
 454         .unbind         = exynos_drm_unbind,
 455 };
 456
 457 static int exynos_drm_platform_probe(struct platform_device *pdev)
 458 {
 459         struct component_match *match;
 460
 461         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 462         exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls);
 463
 464         match = exynos_drm_match_add(&pdev->dev);
 465         if (IS_ERR(match))
 466                 return PTR_ERR(match);
 467
 468         return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
 469                                                match);
 470 }
 471
 472 static int exynos_drm_platform_remove(struct platform_device *pdev)
 473 {
 474         component_master_del(&pdev->dev, &exynos_drm_ops);
 475         return 0;
 476 }
 477
 478 static struct platform_driver exynos_drm_platform_driver = {
 479         .probe  = exynos_drm_platform_probe,
 480         .remove = exynos_drm_platform_remove,
 481         .driver = {
 482                 .name   = "exynos-drm",
 483                 .pm     = &exynos_drm_pm_ops,
 484         },
 485 };
 486
 487 static struct device *exynos_drm_get_dma_device(void)
 488 {
 489         int i;
 490
 491         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
 492                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 493                 struct device *dev;
 494
 495                 if (!info->driver || !(info->flags & DRM_DMA_DEVICE))
 496                         continue;
 497
 498                 while ((dev = bus_find_device(&platform_bus_type, NULL,
 499                                             &info->driver->driver,
 500                                             (void *)platform_bus_type.match))) {
 501                         put_device(dev);
 502                         return dev;
 503                 }
 504         }
 505         return NULL;
 506 }
 507
 508 static void exynos_drm_unregister_devices(void)
 509 {
 510         int i;
 511
 512         for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
 513                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 514                 struct device *dev;
 515
 516                 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
 517                         continue;
 518
 519                 while ((dev = bus_find_device(&platform_bus_type, NULL,
 520                                             &info->driver->driver,
 521                                             (void *)platform_bus_type.match))) {
 522                         put_device(dev);
 523                         platform_device_unregister(to_platform_device(dev));
 524                 }
 525         }
 526 }
 527
 528 static int exynos_drm_register_devices(void)
 529 {
 530         struct platform_device *pdev;
 531         int i;
 532
 533         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
 534                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 535
 536                 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
 537                         continue;
 538
 539                 pdev = platform_device_register_simple(
 540                                         info->driver->driver.name, -1, NULL, 0);
 541                 if (IS_ERR(pdev))
 542                         goto fail;
 543         }
 544
 545         return 0;
 546 fail:
 547         exynos_drm_unregister_devices();
 548         return PTR_ERR(pdev);
 549 }
 550
 551 static void exynos_drm_unregister_drivers(void)
 552 {
 553         int i;
 554
 555         for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
 556                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 557
 558                 if (!info->driver)
 559                         continue;
 560
 561                 platform_driver_unregister(info->driver);
 562         }
 563 }
 564
 565 static int exynos_drm_register_drivers(void)
 566 {
 567         int i, ret;
 568
 569         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
 570                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 571
 572                 if (!info->driver)
 573                         continue;
 574
 575                 ret = platform_driver_register(info->driver);
 576                 if (ret)
 577                         goto fail;
 578         }
 579         return 0;
 580 fail:
 581         exynos_drm_unregister_drivers();
 582         return ret;
 583 }
 584
 585 static int exynos_drm_init(void)
 586 {
 587         int ret;
 588
 589         ret = exynos_drm_register_devices();
 590         if (ret)
 591                 return ret;
 592
 593         ret = exynos_drm_register_drivers();
 594         if (ret)
 595                 goto err_unregister_pdevs;
 596
 597         return 0;
 598
 599 err_unregister_pdevs:
 600         exynos_drm_unregister_devices();
 601
 602         return ret;
 603 }
 604
 605 static void exynos_drm_exit(void)
 606 {
 607         exynos_drm_unregister_drivers();
 608         exynos_drm_unregister_devices();
 609 }
 610
 611 module_init(exynos_drm_init);
 612 module_exit(exynos_drm_exit);
 613
 614 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 615 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 616 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 617 MODULE_DESCRIPTION("Samsung SoC DRM Driver");
 618 MODULE_LICENSE("GPL");