drivers/gpu/drm/mediatek/mtk_drm_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015 MediaTek Inc.
   4  * Author: YT SHEN <[email protected]>
   5  */
   6
   7 #include <linux/component.h>
   8 #include <linux/iommu.h>
   9 #include <linux/module.h>
  10 #include <linux/of_address.h>
  11 #include <linux/of_platform.h>
  12 #include <linux/pm_runtime.h>
  13 #include <linux/soc/mediatek/mtk-mmsys.h>
  14 #include <linux/dma-mapping.h>
  15
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_drv.h>
  19 #include <drm/drm_fb_helper.h>
  20 #include <drm/drm_fourcc.h>
  21 #include <drm/drm_gem.h>
  22 #include <drm/drm_gem_cma_helper.h>
  23 #include <drm/drm_gem_framebuffer_helper.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_probe_helper.h>
  26 #include <drm/drm_vblank.h>
  27
  28 #include "mtk_drm_crtc.h"
  29 #include "mtk_drm_ddp.h"
  30 #include "mtk_drm_ddp.h"
  31 #include "mtk_drm_ddp_comp.h"
  32 #include "mtk_drm_drv.h"
  33 #include "mtk_drm_gem.h"
  34
  35 #define DRIVER_NAME "mediatek"
  36 #define DRIVER_DESC "Mediatek SoC DRM"
  37 #define DRIVER_DATE "20150513"
  38 #define DRIVER_MAJOR 1
  39 #define DRIVER_MINOR 0
  40
  41 static const struct drm_mode_config_helper_funcs mtk_drm_mode_config_helpers = {
  42         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
  43 };
  44
  45 static struct drm_framebuffer *
  46 mtk_drm_mode_fb_create(struct drm_device *dev,
  47                        struct drm_file *file,
  48                        const struct drm_mode_fb_cmd2 *cmd)
  49 {
  50         const struct drm_format_info *info = drm_get_format_info(dev, cmd);
  51
  52         if (info->num_planes != 1)
  53                 return ERR_PTR(-EINVAL);
  54
  55         return drm_gem_fb_create(dev, file, cmd);
  56 }
  57
  58 static const struct drm_mode_config_funcs mtk_drm_mode_config_funcs = {
  59         .fb_create = mtk_drm_mode_fb_create,
  60         .atomic_check = drm_atomic_helper_check,
  61         .atomic_commit = drm_atomic_helper_commit,
  62 };
  63
  64 static const enum mtk_ddp_comp_id mt2701_mtk_ddp_main[] = {
  65         DDP_COMPONENT_OVL0,
  66         DDP_COMPONENT_RDMA0,
  67         DDP_COMPONENT_COLOR0,
  68         DDP_COMPONENT_BLS,
  69         DDP_COMPONENT_DSI0,
  70 };
  71
  72 static const enum mtk_ddp_comp_id mt2701_mtk_ddp_ext[] = {
  73         DDP_COMPONENT_RDMA1,
  74         DDP_COMPONENT_DPI0,
  75 };
  76
  77 static const enum mtk_ddp_comp_id mt2712_mtk_ddp_main[] = {
  78         DDP_COMPONENT_OVL0,
  79         DDP_COMPONENT_COLOR0,
  80         DDP_COMPONENT_AAL0,
  81         DDP_COMPONENT_OD0,
  82         DDP_COMPONENT_RDMA0,
  83         DDP_COMPONENT_DPI0,
  84         DDP_COMPONENT_PWM0,
  85 };
  86
  87 static const enum mtk_ddp_comp_id mt2712_mtk_ddp_ext[] = {
  88         DDP_COMPONENT_OVL1,
  89         DDP_COMPONENT_COLOR1,
  90         DDP_COMPONENT_AAL1,
  91         DDP_COMPONENT_OD1,
  92         DDP_COMPONENT_RDMA1,
  93         DDP_COMPONENT_DPI1,
  94         DDP_COMPONENT_PWM1,
  95 };
  96
  97 static const enum mtk_ddp_comp_id mt2712_mtk_ddp_third[] = {
  98         DDP_COMPONENT_RDMA2,
  99         DDP_COMPONENT_DSI3,
 100         DDP_COMPONENT_PWM2,
 101 };
 102
 103 static const enum mtk_ddp_comp_id mt8173_mtk_ddp_main[] = {
 104         DDP_COMPONENT_OVL0,
 105         DDP_COMPONENT_COLOR0,
 106         DDP_COMPONENT_AAL0,
 107         DDP_COMPONENT_OD0,
 108         DDP_COMPONENT_RDMA0,
 109         DDP_COMPONENT_UFOE,
 110         DDP_COMPONENT_DSI0,
 111         DDP_COMPONENT_PWM0,
 112 };
 113
 114 static const enum mtk_ddp_comp_id mt8173_mtk_ddp_ext[] = {
 115         DDP_COMPONENT_OVL1,
 116         DDP_COMPONENT_COLOR1,
 117         DDP_COMPONENT_GAMMA,
 118         DDP_COMPONENT_RDMA1,
 119         DDP_COMPONENT_DPI0,
 120 };
 121
 122 static const struct mtk_mmsys_driver_data mt2701_mmsys_driver_data = {
 123         .main_path = mt2701_mtk_ddp_main,
 124         .main_len = ARRAY_SIZE(mt2701_mtk_ddp_main),
 125         .ext_path = mt2701_mtk_ddp_ext,
 126         .ext_len = ARRAY_SIZE(mt2701_mtk_ddp_ext),
 127         .shadow_register = true,
 128 };
 129
 130 static const struct mtk_mmsys_driver_data mt2712_mmsys_driver_data = {
 131         .main_path = mt2712_mtk_ddp_main,
 132         .main_len = ARRAY_SIZE(mt2712_mtk_ddp_main),
 133         .ext_path = mt2712_mtk_ddp_ext,
 134         .ext_len = ARRAY_SIZE(mt2712_mtk_ddp_ext),
 135         .third_path = mt2712_mtk_ddp_third,
 136         .third_len = ARRAY_SIZE(mt2712_mtk_ddp_third),
 137 };
 138
 139 static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
 140         .main_path = mt8173_mtk_ddp_main,
 141         .main_len = ARRAY_SIZE(mt8173_mtk_ddp_main),
 142         .ext_path = mt8173_mtk_ddp_ext,
 143         .ext_len = ARRAY_SIZE(mt8173_mtk_ddp_ext),
 144 };
 145
 146 static int mtk_drm_kms_init(struct drm_device *drm)
 147 {
 148         struct mtk_drm_private *private = drm->dev_private;
 149         struct platform_device *pdev;
 150         struct device_node *np;
 151         struct device *dma_dev;
 152         int ret;
 153
 154         if (!iommu_present(&platform_bus_type))
 155                 return -EPROBE_DEFER;
 156
 157         pdev = of_find_device_by_node(private->mutex_node);
 158         if (!pdev) {
 159                 dev_err(drm->dev, "Waiting for disp-mutex device %pOF\n",
 160                         private->mutex_node);
 161                 of_node_put(private->mutex_node);
 162                 return -EPROBE_DEFER;
 163         }
 164         private->mutex_dev = &pdev->dev;
 165
 166         ret = drmm_mode_config_init(drm);
 167         if (ret)
 168                 return ret;
 169
 170         drm->mode_config.min_width = 64;
 171         drm->mode_config.min_height = 64;
 172
 173         /*
 174          * set max width and height as default value(4096x4096).
 175          * this value would be used to check framebuffer size limitation
 176          * at drm_mode_addfb().
 177          */
 178         drm->mode_config.max_width = 4096;
 179         drm->mode_config.max_height = 4096;
 180         drm->mode_config.funcs = &mtk_drm_mode_config_funcs;
 181         drm->mode_config.helper_private = &mtk_drm_mode_config_helpers;
 182
 183         ret = component_bind_all(drm->dev, drm);
 184         if (ret)
 185                 return ret;
 186
 187         /*
 188          * We currently support two fixed data streams, each optional,
 189          * and each statically assigned to a crtc:
 190          * OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0 ...
 191          */
 192         ret = mtk_drm_crtc_create(drm, private->data->main_path,
 193                                   private->data->main_len);
 194         if (ret < 0)
 195                 goto err_component_unbind;
 196         /* ... and OVL1 -> COLOR1 -> GAMMA -> RDMA1 -> DPI0. */
 197         ret = mtk_drm_crtc_create(drm, private->data->ext_path,
 198                                   private->data->ext_len);
 199         if (ret < 0)
 200                 goto err_component_unbind;
 201
 202         ret = mtk_drm_crtc_create(drm, private->data->third_path,
 203                                   private->data->third_len);
 204         if (ret < 0)
 205                 goto err_component_unbind;
 206
 207         /* Use OVL device for all DMA memory allocations */
 208         np = private->comp_node[private->data->main_path[0]] ?:
 209              private->comp_node[private->data->ext_path[0]];
 210         pdev = of_find_device_by_node(np);
 211         if (!pdev) {
 212                 ret = -ENODEV;
 213                 dev_err(drm->dev, "Need at least one OVL device\n");
 214                 goto err_component_unbind;
 215         }
 216
 217         dma_dev = &pdev->dev;
 218         private->dma_dev = dma_dev;
 219
 220         /*
 221          * Configure the DMA segment size to make sure we get contiguous IOVA
 222          * when importing PRIME buffers.
 223          */
 224         if (!dma_dev->dma_parms) {
 225                 private->dma_parms_allocated = true;
 226                 dma_dev->dma_parms =
 227                         devm_kzalloc(drm->dev, sizeof(*dma_dev->dma_parms),
 228                                      GFP_KERNEL);
 229         }
 230         if (!dma_dev->dma_parms) {
 231                 ret = -ENOMEM;
 232                 goto err_component_unbind;
 233         }
 234
 235         ret = dma_set_max_seg_size(dma_dev, (unsigned int)DMA_BIT_MASK(32));
 236         if (ret) {
 237                 dev_err(dma_dev, "Failed to set DMA segment size\n");
 238                 goto err_unset_dma_parms;
 239         }
 240
 241         /*
 242          * We don't use the drm_irq_install() helpers provided by the DRM
 243          * core, so we need to set this manually in order to allow the
 244          * DRM_IOCTL_WAIT_VBLANK to operate correctly.
 245          */
 246         drm->irq_enabled = true;
 247         ret = drm_vblank_init(drm, MAX_CRTC);
 248         if (ret < 0)
 249                 goto err_unset_dma_parms;
 250
 251         drm_kms_helper_poll_init(drm);
 252         drm_mode_config_reset(drm);
 253
 254         return 0;
 255
 256 err_unset_dma_parms:
 257         if (private->dma_parms_allocated)
 258                 dma_dev->dma_parms = NULL;
 259 err_component_unbind:
 260         component_unbind_all(drm->dev, drm);
 261
 262         return ret;
 263 }
 264
 265 static void mtk_drm_kms_deinit(struct drm_device *drm)
 266 {
 267         struct mtk_drm_private *private = drm->dev_private;
 268
 269         drm_kms_helper_poll_fini(drm);
 270         drm_atomic_helper_shutdown(drm);
 271
 272         if (private->dma_parms_allocated)
 273                 private->dma_dev->dma_parms = NULL;
 274
 275         component_unbind_all(drm->dev, drm);
 276 }
 277
 278 static const struct file_operations mtk_drm_fops = {
 279         .owner = THIS_MODULE,
 280         .open = drm_open,
 281         .release = drm_release,
 282         .unlocked_ioctl = drm_ioctl,
 283         .mmap = mtk_drm_gem_mmap,
 284         .poll = drm_poll,
 285         .read = drm_read,
 286         .compat_ioctl = drm_compat_ioctl,
 287 };
 288
 289 /*
 290  * We need to override this because the device used to import the memory is
 291  * not dev->dev, as drm_gem_prime_import() expects.
 292  */
 293 struct drm_gem_object *mtk_drm_gem_prime_import(struct drm_device *dev,
 294                                                 struct dma_buf *dma_buf)
 295 {
 296         struct mtk_drm_private *private = dev->dev_private;
 297
 298         return drm_gem_prime_import_dev(dev, dma_buf, private->dma_dev);
 299 }
 300
 301 static struct drm_driver mtk_drm_driver = {
 302         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 303
 304         .gem_free_object_unlocked = mtk_drm_gem_free_object,
 305         .gem_vm_ops = &drm_gem_cma_vm_ops,
 306         .dumb_create = mtk_drm_gem_dumb_create,
 307
 308         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 309         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 310         .gem_prime_import = mtk_drm_gem_prime_import,
 311         .gem_prime_get_sg_table = mtk_gem_prime_get_sg_table,
 312         .gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
 313         .gem_prime_mmap = mtk_drm_gem_mmap_buf,
 314         .gem_prime_vmap = mtk_drm_gem_prime_vmap,
 315         .gem_prime_vunmap = mtk_drm_gem_prime_vunmap,
 316         .fops = &mtk_drm_fops,
 317
 318         .name = DRIVER_NAME,
 319         .desc = DRIVER_DESC,
 320         .date = DRIVER_DATE,
 321         .major = DRIVER_MAJOR,
 322         .minor = DRIVER_MINOR,
 323 };
 324
 325 static int compare_of(struct device *dev, void *data)
 326 {
 327         return dev->of_node == data;
 328 }
 329
 330 static int mtk_drm_bind(struct device *dev)
 331 {
 332         struct mtk_drm_private *private = dev_get_drvdata(dev);
 333         struct drm_device *drm;
 334         int ret;
 335
 336         drm = drm_dev_alloc(&mtk_drm_driver, dev);
 337         if (IS_ERR(drm))
 338                 return PTR_ERR(drm);
 339
 340         drm->dev_private = private;
 341         private->drm = drm;
 342
 343         ret = mtk_drm_kms_init(drm);
 344         if (ret < 0)
 345                 goto err_free;
 346
 347         ret = drm_dev_register(drm, 0);
 348         if (ret < 0)
 349                 goto err_deinit;
 350
 351         drm_fbdev_generic_setup(drm, 32);
 352
 353         return 0;
 354
 355 err_deinit:
 356         mtk_drm_kms_deinit(drm);
 357 err_free:
 358         drm_dev_put(drm);
 359         return ret;
 360 }
 361
 362 static void mtk_drm_unbind(struct device *dev)
 363 {
 364         struct mtk_drm_private *private = dev_get_drvdata(dev);
 365
 366         drm_dev_unregister(private->drm);
 367         mtk_drm_kms_deinit(private->drm);
 368         drm_dev_put(private->drm);
 369         private->num_pipes = 0;
 370         private->drm = NULL;
 371 }
 372
 373 static const struct component_master_ops mtk_drm_ops = {
 374         .bind           = mtk_drm_bind,
 375         .unbind         = mtk_drm_unbind,
 376 };
 377
 378 static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
 379         { .compatible = "mediatek,mt2701-disp-ovl",
 380           .data = (void *)MTK_DISP_OVL },
 381         { .compatible = "mediatek,mt8173-disp-ovl",
 382           .data = (void *)MTK_DISP_OVL },
 383         { .compatible = "mediatek,mt2701-disp-rdma",
 384           .data = (void *)MTK_DISP_RDMA },
 385         { .compatible = "mediatek,mt8173-disp-rdma",
 386           .data = (void *)MTK_DISP_RDMA },
 387         { .compatible = "mediatek,mt8173-disp-wdma",
 388           .data = (void *)MTK_DISP_WDMA },
 389         { .compatible = "mediatek,mt2701-disp-color",
 390           .data = (void *)MTK_DISP_COLOR },
 391         { .compatible = "mediatek,mt8173-disp-color",
 392           .data = (void *)MTK_DISP_COLOR },
 393         { .compatible = "mediatek,mt8173-disp-aal",
 394           .data = (void *)MTK_DISP_AAL},
 395         { .compatible = "mediatek,mt8173-disp-gamma",
 396           .data = (void *)MTK_DISP_GAMMA, },
 397         { .compatible = "mediatek,mt8173-disp-ufoe",
 398           .data = (void *)MTK_DISP_UFOE },
 399         { .compatible = "mediatek,mt2701-dsi",
 400           .data = (void *)MTK_DSI },
 401         { .compatible = "mediatek,mt8173-dsi",
 402           .data = (void *)MTK_DSI },
 403         { .compatible = "mediatek,mt2701-dpi",
 404           .data = (void *)MTK_DPI },
 405         { .compatible = "mediatek,mt8173-dpi",
 406           .data = (void *)MTK_DPI },
 407         { .compatible = "mediatek,mt2701-disp-mutex",
 408           .data = (void *)MTK_DISP_MUTEX },
 409         { .compatible = "mediatek,mt2712-disp-mutex",
 410           .data = (void *)MTK_DISP_MUTEX },
 411         { .compatible = "mediatek,mt8173-disp-mutex",
 412           .data = (void *)MTK_DISP_MUTEX },
 413         { .compatible = "mediatek,mt2701-disp-pwm",
 414           .data = (void *)MTK_DISP_BLS },
 415         { .compatible = "mediatek,mt8173-disp-pwm",
 416           .data = (void *)MTK_DISP_PWM },
 417         { .compatible = "mediatek,mt8173-disp-od",
 418           .data = (void *)MTK_DISP_OD },
 419         { }
 420 };
 421
 422 static const struct of_device_id mtk_drm_of_ids[] = {
 423         { .compatible = "mediatek,mt2701-mmsys",
 424           .data = &mt2701_mmsys_driver_data},
 425         { .compatible = "mediatek,mt2712-mmsys",
 426           .data = &mt2712_mmsys_driver_data},
 427         { .compatible = "mediatek,mt8173-mmsys",
 428           .data = &mt8173_mmsys_driver_data},
 429         { }
 430 };
 431
 432 static int mtk_drm_probe(struct platform_device *pdev)
 433 {
 434         struct device *dev = &pdev->dev;
 435         struct device_node *phandle = dev->parent->of_node;
 436         const struct of_device_id *of_id;
 437         struct mtk_drm_private *private;
 438         struct device_node *node;
 439         struct component_match *match = NULL;
 440         int ret;
 441         int i;
 442
 443         private = devm_kzalloc(dev, sizeof(*private), GFP_KERNEL);
 444         if (!private)
 445                 return -ENOMEM;
 446
 447         private->mmsys_dev = dev->parent;
 448         if (!private->mmsys_dev) {
 449                 dev_err(dev, "Failed to get MMSYS device\n");
 450                 return -ENODEV;
 451         }
 452
 453         of_id = of_match_node(mtk_drm_of_ids, phandle);
 454         if (!of_id)
 455                 return -ENODEV;
 456
 457         private->data = of_id->data;
 458
 459         /* Iterate over sibling DISP function blocks */
 460         for_each_child_of_node(phandle->parent, node) {
 461                 const struct of_device_id *of_id;
 462                 enum mtk_ddp_comp_type comp_type;
 463                 int comp_id;
 464
 465                 of_id = of_match_node(mtk_ddp_comp_dt_ids, node);
 466                 if (!of_id)
 467                         continue;
 468
 469                 if (!of_device_is_available(node)) {
 470                         dev_dbg(dev, "Skipping disabled component %pOF\n",
 471                                 node);
 472                         continue;
 473                 }
 474
 475                 comp_type = (enum mtk_ddp_comp_type)of_id->data;
 476
 477                 if (comp_type == MTK_DISP_MUTEX) {
 478                         private->mutex_node = of_node_get(node);
 479                         continue;
 480                 }
 481
 482                 comp_id = mtk_ddp_comp_get_id(node, comp_type);
 483                 if (comp_id < 0) {
 484                         dev_warn(dev, "Skipping unknown component %pOF\n",
 485                                  node);
 486                         continue;
 487                 }
 488
 489                 private->comp_node[comp_id] = of_node_get(node);
 490
 491                 /*
 492                  * Currently only the COLOR, OVL, RDMA, DSI, and DPI blocks have
 493                  * separate component platform drivers and initialize their own
 494                  * DDP component structure. The others are initialized here.
 495                  */
 496                 if (comp_type == MTK_DISP_COLOR ||
 497                     comp_type == MTK_DISP_OVL ||
 498                     comp_type == MTK_DISP_OVL_2L ||
 499                     comp_type == MTK_DISP_RDMA ||
 500                     comp_type == MTK_DSI ||
 501                     comp_type == MTK_DPI) {
 502                         dev_info(dev, "Adding component match for %pOF\n",
 503                                  node);
 504                         drm_of_component_match_add(dev, &match, compare_of,
 505                                                    node);
 506                 } else {
 507                         struct mtk_ddp_comp *comp;
 508
 509                         comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
 510                         if (!comp) {
 511                                 ret = -ENOMEM;
 512                                 of_node_put(node);
 513                                 goto err_node;
 514                         }
 515
 516                         ret = mtk_ddp_comp_init(dev->parent, node, comp,
 517                                                 comp_id, NULL);
 518                         if (ret) {
 519                                 of_node_put(node);
 520                                 goto err_node;
 521                         }
 522
 523                         private->ddp_comp[comp_id] = comp;
 524                 }
 525         }
 526
 527         if (!private->mutex_node) {
 528                 dev_err(dev, "Failed to find disp-mutex node\n");
 529                 ret = -ENODEV;
 530                 goto err_node;
 531         }
 532
 533         pm_runtime_enable(dev);
 534
 535         platform_set_drvdata(pdev, private);
 536
 537         ret = component_master_add_with_match(dev, &mtk_drm_ops, match);
 538         if (ret)
 539                 goto err_pm;
 540
 541         return 0;
 542
 543 err_pm:
 544         pm_runtime_disable(dev);
 545 err_node:
 546         of_node_put(private->mutex_node);
 547         for (i = 0; i < DDP_COMPONENT_ID_MAX; i++)
 548                 of_node_put(private->comp_node[i]);
 549         return ret;
 550 }
 551
 552 static int mtk_drm_remove(struct platform_device *pdev)
 553 {
 554         struct mtk_drm_private *private = platform_get_drvdata(pdev);
 555         int i;
 556
 557         component_master_del(&pdev->dev, &mtk_drm_ops);
 558         pm_runtime_disable(&pdev->dev);
 559         of_node_put(private->mutex_node);
 560         for (i = 0; i < DDP_COMPONENT_ID_MAX; i++)
 561                 of_node_put(private->comp_node[i]);
 562
 563         return 0;
 564 }
 565
 566 #ifdef CONFIG_PM_SLEEP
 567 static int mtk_drm_sys_suspend(struct device *dev)
 568 {
 569         struct mtk_drm_private *private = dev_get_drvdata(dev);
 570         struct drm_device *drm = private->drm;
 571         int ret;
 572
 573         ret = drm_mode_config_helper_suspend(drm);
 574
 575         return ret;
 576 }
 577
 578 static int mtk_drm_sys_resume(struct device *dev)
 579 {
 580         struct mtk_drm_private *private = dev_get_drvdata(dev);
 581         struct drm_device *drm = private->drm;
 582         int ret;
 583
 584         ret = drm_mode_config_helper_resume(drm);
 585
 586         return ret;
 587 }
 588 #endif
 589
 590 static SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend,
 591                          mtk_drm_sys_resume);
 592
 593 static struct platform_driver mtk_drm_platform_driver = {
 594         .probe  = mtk_drm_probe,
 595         .remove = mtk_drm_remove,
 596         .driver = {
 597                 .name   = "mediatek-drm",
 598                 .pm     = &mtk_drm_pm_ops,
 599         },
 600 };
 601
 602 static struct platform_driver * const mtk_drm_drivers[] = {
 603         &mtk_ddp_driver,
 604         &mtk_disp_color_driver,
 605         &mtk_disp_ovl_driver,
 606         &mtk_disp_rdma_driver,
 607         &mtk_dpi_driver,
 608         &mtk_drm_platform_driver,
 609         &mtk_mipi_tx_driver,
 610         &mtk_dsi_driver,
 611 };
 612
 613 static int __init mtk_drm_init(void)
 614 {
 615         return platform_register_drivers(mtk_drm_drivers,
 616                                          ARRAY_SIZE(mtk_drm_drivers));
 617 }
 618
 619 static void __exit mtk_drm_exit(void)
 620 {
 621         platform_unregister_drivers(mtk_drm_drivers,
 622                                     ARRAY_SIZE(mtk_drm_drivers));
 623 }
 624
 625 module_init(mtk_drm_init);
 626 module_exit(mtk_drm_exit);
 627
 628 MODULE_AUTHOR("YT SHEN <[email protected]>");
 629 MODULE_DESCRIPTION("Mediatek SoC DRM driver");
 630 MODULE_LICENSE("GPL v2");