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_crtc.h" 26 #include "exynos_drm_fbdev.h" 27 #include "exynos_drm_fb.h" 28 #include "exynos_drm_gem.h" 29 #include "exynos_drm_plane.h" 30 #include "exynos_drm_vidi.h" 31 #include "exynos_drm_g2d.h" 32 #include "exynos_drm_ipp.h" 33 #include "exynos_drm_iommu.h" 34 35 #define DRIVER_NAME "exynos" 36 #define DRIVER_DESC "Samsung SoC DRM" 37 #define DRIVER_DATE "20110530" 38 #define DRIVER_MAJOR 1 39 #define DRIVER_MINOR 0 40 41 struct exynos_atomic_commit { 42 struct work_struct work; 43 struct drm_device *dev; 44 struct drm_atomic_state *state; 45 u32 crtcs; 46 }; 47 48 static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit) 49 { 50 struct drm_device *dev = commit->dev; 51 struct exynos_drm_private *priv = dev->dev_private; 52 struct drm_atomic_state *state = commit->state; 53 54 drm_atomic_helper_commit_modeset_disables(dev, state); 55 56 drm_atomic_helper_commit_modeset_enables(dev, state); 57 58 /* 59 * Exynos can't update planes with CRTCs and encoders disabled, 60 * its updates routines, specially for FIMD, requires the clocks 61 * to be enabled. So it is necessary to handle the modeset operations 62 * *before* the commit_planes() step, this way it will always 63 * have the relevant clocks enabled to perform the update. 64 */ 65 66 drm_atomic_helper_commit_planes(dev, state, 0); 67 68 drm_atomic_helper_wait_for_vblanks(dev, state); 69 70 drm_atomic_helper_cleanup_planes(dev, state); 71 72 drm_atomic_state_free(state); 73 74 spin_lock(&priv->lock); 75 priv->pending &= ~commit->crtcs; 76 spin_unlock(&priv->lock); 77 78 wake_up_all(&priv->wait); 79 80 kfree(commit); 81 } 82 83 static void exynos_drm_atomic_work(struct work_struct *work) 84 { 85 struct exynos_atomic_commit *commit = container_of(work, 86 struct exynos_atomic_commit, work); 87 88 exynos_atomic_commit_complete(commit); 89 } 90 91 static struct device *exynos_drm_get_dma_device(void); 92 93 static int exynos_drm_load(struct drm_device *dev, unsigned long flags) 94 { 95 struct exynos_drm_private *private; 96 struct drm_encoder *encoder; 97 unsigned int clone_mask; 98 int cnt, ret; 99 100 private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL); 101 if (!private) 102 return -ENOMEM; 103 104 init_waitqueue_head(&private->wait); 105 spin_lock_init(&private->lock); 106 107 dev_set_drvdata(dev->dev, dev); 108 dev->dev_private = (void *)private; 109 110 /* the first real CRTC device is used for all dma mapping operations */ 111 private->dma_dev = exynos_drm_get_dma_device(); 112 if (!private->dma_dev) { 113 DRM_ERROR("no device found for DMA mapping operations.\n"); 114 ret = -ENODEV; 115 goto err_free_private; 116 } 117 DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n", 118 dev_name(private->dma_dev)); 119 120 /* create common IOMMU mapping for all devices attached to Exynos DRM */ 121 ret = drm_create_iommu_mapping(dev); 122 if (ret < 0) { 123 DRM_ERROR("failed to create iommu mapping.\n"); 124 goto err_free_private; 125 } 126 127 drm_mode_config_init(dev); 128 129 exynos_drm_mode_config_init(dev); 130 131 /* setup possible_clones. */ 132 cnt = 0; 133 clone_mask = 0; 134 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 135 clone_mask |= (1 << (cnt++)); 136 137 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 138 encoder->possible_clones = clone_mask; 139 140 platform_set_drvdata(dev->platformdev, dev); 141 142 /* Try to bind all sub drivers. */ 143 ret = component_bind_all(dev->dev, dev); 144 if (ret) 145 goto err_mode_config_cleanup; 146 147 ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 148 if (ret) 149 goto err_unbind_all; 150 151 /* Probe non kms sub drivers and virtual display driver. */ 152 ret = exynos_drm_device_subdrv_probe(dev); 153 if (ret) 154 goto err_cleanup_vblank; 155 156 drm_mode_config_reset(dev); 157 158 /* 159 * enable drm irq mode. 160 * - with irq_enabled = true, we can use the vblank feature. 161 * 162 * P.S. note that we wouldn't use drm irq handler but 163 * just specific driver own one instead because 164 * drm framework supports only one irq handler. 165 */ 166 dev->irq_enabled = true; 167 168 /* init kms poll for handling hpd */ 169 drm_kms_helper_poll_init(dev); 170 171 /* force connectors detection */ 172 drm_helper_hpd_irq_event(dev); 173 174 return 0; 175 176 err_cleanup_vblank: 177 drm_vblank_cleanup(dev); 178 err_unbind_all: 179 component_unbind_all(dev->dev, dev); 180 err_mode_config_cleanup: 181 drm_mode_config_cleanup(dev); 182 drm_release_iommu_mapping(dev); 183 err_free_private: 184 kfree(private); 185 186 return ret; 187 } 188 189 static int exynos_drm_unload(struct drm_device *dev) 190 { 191 exynos_drm_device_subdrv_remove(dev); 192 193 exynos_drm_fbdev_fini(dev); 194 drm_kms_helper_poll_fini(dev); 195 196 drm_vblank_cleanup(dev); 197 component_unbind_all(dev->dev, dev); 198 drm_mode_config_cleanup(dev); 199 drm_release_iommu_mapping(dev); 200 201 kfree(dev->dev_private); 202 dev->dev_private = NULL; 203 204 return 0; 205 } 206 207 static int commit_is_pending(struct exynos_drm_private *priv, u32 crtcs) 208 { 209 bool pending; 210 211 spin_lock(&priv->lock); 212 pending = priv->pending & crtcs; 213 spin_unlock(&priv->lock); 214 215 return pending; 216 } 217 218 int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state, 219 bool nonblock) 220 { 221 struct exynos_drm_private *priv = dev->dev_private; 222 struct exynos_atomic_commit *commit; 223 struct drm_crtc *crtc; 224 struct drm_crtc_state *crtc_state; 225 int i, ret; 226 227 commit = kzalloc(sizeof(*commit), GFP_KERNEL); 228 if (!commit) 229 return -ENOMEM; 230 231 ret = drm_atomic_helper_prepare_planes(dev, state); 232 if (ret) { 233 kfree(commit); 234 return ret; 235 } 236 237 /* This is the point of no return */ 238 239 INIT_WORK(&commit->work, exynos_drm_atomic_work); 240 commit->dev = dev; 241 commit->state = state; 242 243 /* Wait until all affected CRTCs have completed previous commits and 244 * mark them as pending. 245 */ 246 for_each_crtc_in_state(state, crtc, crtc_state, i) 247 commit->crtcs |= drm_crtc_mask(crtc); 248 249 wait_event(priv->wait, !commit_is_pending(priv, commit->crtcs)); 250 251 spin_lock(&priv->lock); 252 priv->pending |= commit->crtcs; 253 spin_unlock(&priv->lock); 254 255 drm_atomic_helper_swap_state(state, true); 256 257 if (nonblock) 258 schedule_work(&commit->work); 259 else 260 exynos_atomic_commit_complete(commit); 261 262 return 0; 263 } 264 265 int exynos_atomic_check(struct drm_device *dev, 266 struct drm_atomic_state *state) 267 { 268 int ret; 269 270 ret = drm_atomic_helper_check_modeset(dev, state); 271 if (ret) 272 return ret; 273 274 ret = drm_atomic_normalize_zpos(dev, state); 275 if (ret) 276 return ret; 277 278 ret = drm_atomic_helper_check_planes(dev, state); 279 if (ret) 280 return ret; 281 282 return ret; 283 } 284 285 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file) 286 { 287 struct drm_exynos_file_private *file_priv; 288 int ret; 289 290 file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL); 291 if (!file_priv) 292 return -ENOMEM; 293 294 file->driver_priv = file_priv; 295 296 ret = exynos_drm_subdrv_open(dev, file); 297 if (ret) 298 goto err_file_priv_free; 299 300 return ret; 301 302 err_file_priv_free: 303 kfree(file_priv); 304 file->driver_priv = NULL; 305 return ret; 306 } 307 308 static void exynos_drm_preclose(struct drm_device *dev, 309 struct drm_file *file) 310 { 311 struct drm_crtc *crtc; 312 313 exynos_drm_subdrv_close(dev, file); 314 315 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) 316 exynos_drm_crtc_cancel_page_flip(crtc, file); 317 } 318 319 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file) 320 { 321 kfree(file->driver_priv); 322 file->driver_priv = NULL; 323 } 324 325 static void exynos_drm_lastclose(struct drm_device *dev) 326 { 327 exynos_drm_fbdev_restore_mode(dev); 328 } 329 330 static const struct vm_operations_struct exynos_drm_gem_vm_ops = { 331 .fault = exynos_drm_gem_fault, 332 .open = drm_gem_vm_open, 333 .close = drm_gem_vm_close, 334 }; 335 336 static const struct drm_ioctl_desc exynos_ioctls[] = { 337 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl, 338 DRM_AUTH | DRM_RENDER_ALLOW), 339 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl, 340 DRM_AUTH | DRM_RENDER_ALLOW), 341 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl, 342 DRM_RENDER_ALLOW), 343 DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl, 344 DRM_AUTH), 345 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl, 346 DRM_AUTH | DRM_RENDER_ALLOW), 347 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl, 348 DRM_AUTH | DRM_RENDER_ALLOW), 349 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl, 350 DRM_AUTH | DRM_RENDER_ALLOW), 351 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property, 352 DRM_AUTH | DRM_RENDER_ALLOW), 353 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property, 354 DRM_AUTH | DRM_RENDER_ALLOW), 355 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf, 356 DRM_AUTH | DRM_RENDER_ALLOW), 357 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl, 358 DRM_AUTH | DRM_RENDER_ALLOW), 359 }; 360 361 static const struct file_operations exynos_drm_driver_fops = { 362 .owner = THIS_MODULE, 363 .open = drm_open, 364 .mmap = exynos_drm_gem_mmap, 365 .poll = drm_poll, 366 .read = drm_read, 367 .unlocked_ioctl = drm_ioctl, 368 #ifdef CONFIG_COMPAT 369 .compat_ioctl = drm_compat_ioctl, 370 #endif 371 .release = drm_release, 372 }; 373 374 static struct drm_driver exynos_drm_driver = { 375 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME 376 | DRIVER_ATOMIC | DRIVER_RENDER, 377 .load = exynos_drm_load, 378 .unload = exynos_drm_unload, 379 .open = exynos_drm_open, 380 .preclose = exynos_drm_preclose, 381 .lastclose = exynos_drm_lastclose, 382 .postclose = exynos_drm_postclose, 383 .get_vblank_counter = drm_vblank_no_hw_counter, 384 .enable_vblank = exynos_drm_crtc_enable_vblank, 385 .disable_vblank = exynos_drm_crtc_disable_vblank, 386 .gem_free_object_unlocked = exynos_drm_gem_free_object, 387 .gem_vm_ops = &exynos_drm_gem_vm_ops, 388 .dumb_create = exynos_drm_gem_dumb_create, 389 .dumb_map_offset = exynos_drm_gem_dumb_map_offset, 390 .dumb_destroy = drm_gem_dumb_destroy, 391 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 392 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 393 .gem_prime_export = drm_gem_prime_export, 394 .gem_prime_import = drm_gem_prime_import, 395 .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table, 396 .gem_prime_import_sg_table = exynos_drm_gem_prime_import_sg_table, 397 .gem_prime_vmap = exynos_drm_gem_prime_vmap, 398 .gem_prime_vunmap = exynos_drm_gem_prime_vunmap, 399 .gem_prime_mmap = exynos_drm_gem_prime_mmap, 400 .ioctls = exynos_ioctls, 401 .num_ioctls = ARRAY_SIZE(exynos_ioctls), 402 .fops = &exynos_drm_driver_fops, 403 .name = DRIVER_NAME, 404 .desc = DRIVER_DESC, 405 .date = DRIVER_DATE, 406 .major = DRIVER_MAJOR, 407 .minor = DRIVER_MINOR, 408 }; 409 410 #ifdef CONFIG_PM_SLEEP 411 static int exynos_drm_suspend(struct device *dev) 412 { 413 struct drm_device *drm_dev = dev_get_drvdata(dev); 414 struct drm_connector *connector; 415 416 if (pm_runtime_suspended(dev) || !drm_dev) 417 return 0; 418 419 drm_modeset_lock_all(drm_dev); 420 drm_for_each_connector(connector, drm_dev) { 421 int old_dpms = connector->dpms; 422 423 if (connector->funcs->dpms) 424 connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF); 425 426 /* Set the old mode back to the connector for resume */ 427 connector->dpms = old_dpms; 428 } 429 drm_modeset_unlock_all(drm_dev); 430 431 return 0; 432 } 433 434 static int exynos_drm_resume(struct device *dev) 435 { 436 struct drm_device *drm_dev = dev_get_drvdata(dev); 437 struct drm_connector *connector; 438 439 if (pm_runtime_suspended(dev) || !drm_dev) 440 return 0; 441 442 drm_modeset_lock_all(drm_dev); 443 drm_for_each_connector(connector, drm_dev) { 444 if (connector->funcs->dpms) { 445 int dpms = connector->dpms; 446 447 connector->dpms = DRM_MODE_DPMS_OFF; 448 connector->funcs->dpms(connector, dpms); 449 } 450 } 451 drm_modeset_unlock_all(drm_dev); 452 453 return 0; 454 } 455 #endif 456 457 static const struct dev_pm_ops exynos_drm_pm_ops = { 458 SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume) 459 }; 460 461 /* forward declaration */ 462 static struct platform_driver exynos_drm_platform_driver; 463 464 struct exynos_drm_driver_info { 465 struct platform_driver *driver; 466 unsigned int flags; 467 }; 468 469 #define DRM_COMPONENT_DRIVER BIT(0) /* supports component framework */ 470 #define DRM_VIRTUAL_DEVICE BIT(1) /* create virtual platform device */ 471 #define DRM_DMA_DEVICE BIT(2) /* can be used for dma allocations */ 472 473 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL) 474 475 /* 476 * Connector drivers should not be placed before associated crtc drivers, 477 * because connector requires pipe number of its crtc during initialization. 478 */ 479 static struct exynos_drm_driver_info exynos_drm_drivers[] = { 480 { 481 DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD), 482 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 483 }, { 484 DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON), 485 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 486 }, { 487 DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON), 488 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 489 }, { 490 DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER), 491 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 492 }, { 493 DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC), 494 DRM_COMPONENT_DRIVER 495 }, { 496 DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP), 497 DRM_COMPONENT_DRIVER 498 }, { 499 DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI), 500 DRM_COMPONENT_DRIVER 501 }, { 502 DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI), 503 DRM_COMPONENT_DRIVER 504 }, { 505 DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI), 506 DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE 507 }, { 508 DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D), 509 }, { 510 DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC), 511 }, { 512 DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR), 513 }, { 514 DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC), 515 }, { 516 DRV_PTR(ipp_driver, CONFIG_DRM_EXYNOS_IPP), 517 DRM_VIRTUAL_DEVICE 518 }, { 519 &exynos_drm_platform_driver, 520 DRM_VIRTUAL_DEVICE 521 } 522 }; 523 524 static int compare_dev(struct device *dev, void *data) 525 { 526 return dev == (struct device *)data; 527 } 528 529 static struct component_match *exynos_drm_match_add(struct device *dev) 530 { 531 struct component_match *match = NULL; 532 int i; 533 534 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 535 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 536 struct device *p = NULL, *d; 537 538 if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER)) 539 continue; 540 541 while ((d = bus_find_device(&platform_bus_type, p, 542 &info->driver->driver, 543 (void *)platform_bus_type.match))) { 544 put_device(p); 545 component_match_add(dev, &match, compare_dev, d); 546 p = d; 547 } 548 put_device(p); 549 } 550 551 return match ?: ERR_PTR(-ENODEV); 552 } 553 554 static int exynos_drm_bind(struct device *dev) 555 { 556 return drm_platform_init(&exynos_drm_driver, to_platform_device(dev)); 557 } 558 559 static void exynos_drm_unbind(struct device *dev) 560 { 561 drm_put_dev(dev_get_drvdata(dev)); 562 } 563 564 static const struct component_master_ops exynos_drm_ops = { 565 .bind = exynos_drm_bind, 566 .unbind = exynos_drm_unbind, 567 }; 568 569 static int exynos_drm_platform_probe(struct platform_device *pdev) 570 { 571 struct component_match *match; 572 573 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 574 exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls); 575 576 match = exynos_drm_match_add(&pdev->dev); 577 if (IS_ERR(match)) 578 return PTR_ERR(match); 579 580 return component_master_add_with_match(&pdev->dev, &exynos_drm_ops, 581 match); 582 } 583 584 static int exynos_drm_platform_remove(struct platform_device *pdev) 585 { 586 component_master_del(&pdev->dev, &exynos_drm_ops); 587 return 0; 588 } 589 590 static struct platform_driver exynos_drm_platform_driver = { 591 .probe = exynos_drm_platform_probe, 592 .remove = exynos_drm_platform_remove, 593 .driver = { 594 .name = "exynos-drm", 595 .pm = &exynos_drm_pm_ops, 596 }, 597 }; 598 599 static struct device *exynos_drm_get_dma_device(void) 600 { 601 int i; 602 603 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 604 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 605 struct device *dev; 606 607 if (!info->driver || !(info->flags & DRM_DMA_DEVICE)) 608 continue; 609 610 while ((dev = bus_find_device(&platform_bus_type, NULL, 611 &info->driver->driver, 612 (void *)platform_bus_type.match))) { 613 put_device(dev); 614 return dev; 615 } 616 } 617 return NULL; 618 } 619 620 static void exynos_drm_unregister_devices(void) 621 { 622 int i; 623 624 for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) { 625 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 626 struct device *dev; 627 628 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE)) 629 continue; 630 631 while ((dev = bus_find_device(&platform_bus_type, NULL, 632 &info->driver->driver, 633 (void *)platform_bus_type.match))) { 634 put_device(dev); 635 platform_device_unregister(to_platform_device(dev)); 636 } 637 } 638 } 639 640 static int exynos_drm_register_devices(void) 641 { 642 struct platform_device *pdev; 643 int i; 644 645 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 646 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 647 648 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE)) 649 continue; 650 651 pdev = platform_device_register_simple( 652 info->driver->driver.name, -1, NULL, 0); 653 if (IS_ERR(pdev)) 654 goto fail; 655 } 656 657 return 0; 658 fail: 659 exynos_drm_unregister_devices(); 660 return PTR_ERR(pdev); 661 } 662 663 static void exynos_drm_unregister_drivers(void) 664 { 665 int i; 666 667 for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) { 668 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 669 670 if (!info->driver) 671 continue; 672 673 platform_driver_unregister(info->driver); 674 } 675 } 676 677 static int exynos_drm_register_drivers(void) 678 { 679 int i, ret; 680 681 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 682 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 683 684 if (!info->driver) 685 continue; 686 687 ret = platform_driver_register(info->driver); 688 if (ret) 689 goto fail; 690 } 691 return 0; 692 fail: 693 exynos_drm_unregister_drivers(); 694 return ret; 695 } 696 697 static int exynos_drm_init(void) 698 { 699 int ret; 700 701 ret = exynos_drm_register_devices(); 702 if (ret) 703 return ret; 704 705 ret = exynos_drm_register_drivers(); 706 if (ret) 707 goto err_unregister_pdevs; 708 709 return 0; 710 711 err_unregister_pdevs: 712 exynos_drm_unregister_devices(); 713 714 return ret; 715 } 716 717 static void exynos_drm_exit(void) 718 { 719 exynos_drm_unregister_drivers(); 720 exynos_drm_unregister_devices(); 721 } 722 723 module_init(exynos_drm_init); 724 module_exit(exynos_drm_exit); 725 726 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>"); 727 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 728 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>"); 729 MODULE_DESCRIPTION("Samsung SoC DRM Driver"); 730 MODULE_LICENSE("GPL"); 731