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_put(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 drm_atomic_state_get(state); 258 if (nonblock) 259 schedule_work(&commit->work); 260 else 261 exynos_atomic_commit_complete(commit); 262 263 return 0; 264 } 265 266 int exynos_atomic_check(struct drm_device *dev, 267 struct drm_atomic_state *state) 268 { 269 int ret; 270 271 ret = drm_atomic_helper_check_modeset(dev, state); 272 if (ret) 273 return ret; 274 275 ret = drm_atomic_normalize_zpos(dev, state); 276 if (ret) 277 return ret; 278 279 ret = drm_atomic_helper_check_planes(dev, state); 280 if (ret) 281 return ret; 282 283 return ret; 284 } 285 286 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file) 287 { 288 struct drm_exynos_file_private *file_priv; 289 int ret; 290 291 file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL); 292 if (!file_priv) 293 return -ENOMEM; 294 295 file->driver_priv = file_priv; 296 297 ret = exynos_drm_subdrv_open(dev, file); 298 if (ret) 299 goto err_file_priv_free; 300 301 return ret; 302 303 err_file_priv_free: 304 kfree(file_priv); 305 file->driver_priv = NULL; 306 return ret; 307 } 308 309 static void exynos_drm_preclose(struct drm_device *dev, 310 struct drm_file *file) 311 { 312 struct drm_crtc *crtc; 313 314 exynos_drm_subdrv_close(dev, file); 315 316 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) 317 exynos_drm_crtc_cancel_page_flip(crtc, file); 318 } 319 320 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file) 321 { 322 kfree(file->driver_priv); 323 file->driver_priv = NULL; 324 } 325 326 static void exynos_drm_lastclose(struct drm_device *dev) 327 { 328 exynos_drm_fbdev_restore_mode(dev); 329 } 330 331 static const struct vm_operations_struct exynos_drm_gem_vm_ops = { 332 .fault = exynos_drm_gem_fault, 333 .open = drm_gem_vm_open, 334 .close = drm_gem_vm_close, 335 }; 336 337 static const struct drm_ioctl_desc exynos_ioctls[] = { 338 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl, 339 DRM_AUTH | DRM_RENDER_ALLOW), 340 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl, 341 DRM_AUTH | DRM_RENDER_ALLOW), 342 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl, 343 DRM_RENDER_ALLOW), 344 DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl, 345 DRM_AUTH), 346 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl, 347 DRM_AUTH | DRM_RENDER_ALLOW), 348 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl, 349 DRM_AUTH | DRM_RENDER_ALLOW), 350 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl, 351 DRM_AUTH | DRM_RENDER_ALLOW), 352 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property, 353 DRM_AUTH | DRM_RENDER_ALLOW), 354 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property, 355 DRM_AUTH | DRM_RENDER_ALLOW), 356 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf, 357 DRM_AUTH | DRM_RENDER_ALLOW), 358 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl, 359 DRM_AUTH | DRM_RENDER_ALLOW), 360 }; 361 362 static const struct file_operations exynos_drm_driver_fops = { 363 .owner = THIS_MODULE, 364 .open = drm_open, 365 .mmap = exynos_drm_gem_mmap, 366 .poll = drm_poll, 367 .read = drm_read, 368 .unlocked_ioctl = drm_ioctl, 369 .compat_ioctl = drm_compat_ioctl, 370 .release = drm_release, 371 }; 372 373 static struct drm_driver exynos_drm_driver = { 374 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME 375 | DRIVER_ATOMIC | DRIVER_RENDER, 376 .load = exynos_drm_load, 377 .unload = exynos_drm_unload, 378 .open = exynos_drm_open, 379 .preclose = exynos_drm_preclose, 380 .lastclose = exynos_drm_lastclose, 381 .postclose = exynos_drm_postclose, 382 .get_vblank_counter = drm_vblank_no_hw_counter, 383 .enable_vblank = exynos_drm_crtc_enable_vblank, 384 .disable_vblank = exynos_drm_crtc_disable_vblank, 385 .gem_free_object_unlocked = exynos_drm_gem_free_object, 386 .gem_vm_ops = &exynos_drm_gem_vm_ops, 387 .dumb_create = exynos_drm_gem_dumb_create, 388 .dumb_map_offset = exynos_drm_gem_dumb_map_offset, 389 .dumb_destroy = drm_gem_dumb_destroy, 390 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 391 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 392 .gem_prime_export = drm_gem_prime_export, 393 .gem_prime_import = drm_gem_prime_import, 394 .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table, 395 .gem_prime_import_sg_table = exynos_drm_gem_prime_import_sg_table, 396 .gem_prime_vmap = exynos_drm_gem_prime_vmap, 397 .gem_prime_vunmap = exynos_drm_gem_prime_vunmap, 398 .gem_prime_mmap = exynos_drm_gem_prime_mmap, 399 .ioctls = exynos_ioctls, 400 .num_ioctls = ARRAY_SIZE(exynos_ioctls), 401 .fops = &exynos_drm_driver_fops, 402 .name = DRIVER_NAME, 403 .desc = DRIVER_DESC, 404 .date = DRIVER_DATE, 405 .major = DRIVER_MAJOR, 406 .minor = DRIVER_MINOR, 407 }; 408 409 #ifdef CONFIG_PM_SLEEP 410 static int exynos_drm_suspend(struct device *dev) 411 { 412 struct drm_device *drm_dev = dev_get_drvdata(dev); 413 struct drm_connector *connector; 414 415 if (pm_runtime_suspended(dev) || !drm_dev) 416 return 0; 417 418 drm_modeset_lock_all(drm_dev); 419 drm_for_each_connector(connector, drm_dev) { 420 int old_dpms = connector->dpms; 421 422 if (connector->funcs->dpms) 423 connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF); 424 425 /* Set the old mode back to the connector for resume */ 426 connector->dpms = old_dpms; 427 } 428 drm_modeset_unlock_all(drm_dev); 429 430 return 0; 431 } 432 433 static int exynos_drm_resume(struct device *dev) 434 { 435 struct drm_device *drm_dev = dev_get_drvdata(dev); 436 struct drm_connector *connector; 437 438 if (pm_runtime_suspended(dev) || !drm_dev) 439 return 0; 440 441 drm_modeset_lock_all(drm_dev); 442 drm_for_each_connector(connector, drm_dev) { 443 if (connector->funcs->dpms) { 444 int dpms = connector->dpms; 445 446 connector->dpms = DRM_MODE_DPMS_OFF; 447 connector->funcs->dpms(connector, dpms); 448 } 449 } 450 drm_modeset_unlock_all(drm_dev); 451 452 return 0; 453 } 454 #endif 455 456 static const struct dev_pm_ops exynos_drm_pm_ops = { 457 SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume) 458 }; 459 460 /* forward declaration */ 461 static struct platform_driver exynos_drm_platform_driver; 462 463 struct exynos_drm_driver_info { 464 struct platform_driver *driver; 465 unsigned int flags; 466 }; 467 468 #define DRM_COMPONENT_DRIVER BIT(0) /* supports component framework */ 469 #define DRM_VIRTUAL_DEVICE BIT(1) /* create virtual platform device */ 470 #define DRM_DMA_DEVICE BIT(2) /* can be used for dma allocations */ 471 472 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL) 473 474 /* 475 * Connector drivers should not be placed before associated crtc drivers, 476 * because connector requires pipe number of its crtc during initialization. 477 */ 478 static struct exynos_drm_driver_info exynos_drm_drivers[] = { 479 { 480 DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD), 481 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 482 }, { 483 DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON), 484 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 485 }, { 486 DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON), 487 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 488 }, { 489 DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER), 490 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 491 }, { 492 DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC), 493 DRM_COMPONENT_DRIVER 494 }, { 495 DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP), 496 DRM_COMPONENT_DRIVER 497 }, { 498 DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI), 499 DRM_COMPONENT_DRIVER 500 }, { 501 DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI), 502 DRM_COMPONENT_DRIVER 503 }, { 504 DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI), 505 DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE 506 }, { 507 DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D), 508 }, { 509 DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC), 510 }, { 511 DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR), 512 }, { 513 DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC), 514 }, { 515 DRV_PTR(ipp_driver, CONFIG_DRM_EXYNOS_IPP), 516 DRM_VIRTUAL_DEVICE 517 }, { 518 &exynos_drm_platform_driver, 519 DRM_VIRTUAL_DEVICE 520 } 521 }; 522 523 static int compare_dev(struct device *dev, void *data) 524 { 525 return dev == (struct device *)data; 526 } 527 528 static struct component_match *exynos_drm_match_add(struct device *dev) 529 { 530 struct component_match *match = NULL; 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 struct device *p = NULL, *d; 536 537 if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER)) 538 continue; 539 540 while ((d = bus_find_device(&platform_bus_type, p, 541 &info->driver->driver, 542 (void *)platform_bus_type.match))) { 543 put_device(p); 544 component_match_add(dev, &match, compare_dev, d); 545 p = d; 546 } 547 put_device(p); 548 } 549 550 return match ?: ERR_PTR(-ENODEV); 551 } 552 553 static int exynos_drm_bind(struct device *dev) 554 { 555 return drm_platform_init(&exynos_drm_driver, to_platform_device(dev)); 556 } 557 558 static void exynos_drm_unbind(struct device *dev) 559 { 560 drm_put_dev(dev_get_drvdata(dev)); 561 } 562 563 static const struct component_master_ops exynos_drm_ops = { 564 .bind = exynos_drm_bind, 565 .unbind = exynos_drm_unbind, 566 }; 567 568 static int exynos_drm_platform_probe(struct platform_device *pdev) 569 { 570 struct component_match *match; 571 572 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 573 exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls); 574 575 match = exynos_drm_match_add(&pdev->dev); 576 if (IS_ERR(match)) 577 return PTR_ERR(match); 578 579 return component_master_add_with_match(&pdev->dev, &exynos_drm_ops, 580 match); 581 } 582 583 static int exynos_drm_platform_remove(struct platform_device *pdev) 584 { 585 component_master_del(&pdev->dev, &exynos_drm_ops); 586 return 0; 587 } 588 589 static struct platform_driver exynos_drm_platform_driver = { 590 .probe = exynos_drm_platform_probe, 591 .remove = exynos_drm_platform_remove, 592 .driver = { 593 .name = "exynos-drm", 594 .pm = &exynos_drm_pm_ops, 595 }, 596 }; 597 598 static struct device *exynos_drm_get_dma_device(void) 599 { 600 int i; 601 602 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 603 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 604 struct device *dev; 605 606 if (!info->driver || !(info->flags & DRM_DMA_DEVICE)) 607 continue; 608 609 while ((dev = bus_find_device(&platform_bus_type, NULL, 610 &info->driver->driver, 611 (void *)platform_bus_type.match))) { 612 put_device(dev); 613 return dev; 614 } 615 } 616 return NULL; 617 } 618 619 static void exynos_drm_unregister_devices(void) 620 { 621 int i; 622 623 for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) { 624 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 625 struct device *dev; 626 627 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE)) 628 continue; 629 630 while ((dev = bus_find_device(&platform_bus_type, NULL, 631 &info->driver->driver, 632 (void *)platform_bus_type.match))) { 633 put_device(dev); 634 platform_device_unregister(to_platform_device(dev)); 635 } 636 } 637 } 638 639 static int exynos_drm_register_devices(void) 640 { 641 struct platform_device *pdev; 642 int i; 643 644 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 645 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 646 647 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE)) 648 continue; 649 650 pdev = platform_device_register_simple( 651 info->driver->driver.name, -1, NULL, 0); 652 if (IS_ERR(pdev)) 653 goto fail; 654 } 655 656 return 0; 657 fail: 658 exynos_drm_unregister_devices(); 659 return PTR_ERR(pdev); 660 } 661 662 static void exynos_drm_unregister_drivers(void) 663 { 664 int i; 665 666 for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) { 667 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 668 669 if (!info->driver) 670 continue; 671 672 platform_driver_unregister(info->driver); 673 } 674 } 675 676 static int exynos_drm_register_drivers(void) 677 { 678 int i, ret; 679 680 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 681 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 682 683 if (!info->driver) 684 continue; 685 686 ret = platform_driver_register(info->driver); 687 if (ret) 688 goto fail; 689 } 690 return 0; 691 fail: 692 exynos_drm_unregister_drivers(); 693 return ret; 694 } 695 696 static int exynos_drm_init(void) 697 { 698 int ret; 699 700 ret = exynos_drm_register_devices(); 701 if (ret) 702 return ret; 703 704 ret = exynos_drm_register_drivers(); 705 if (ret) 706 goto err_unregister_pdevs; 707 708 return 0; 709 710 err_unregister_pdevs: 711 exynos_drm_unregister_devices(); 712 713 return ret; 714 } 715 716 static void exynos_drm_exit(void) 717 { 718 exynos_drm_unregister_drivers(); 719 exynos_drm_unregister_devices(); 720 } 721 722 module_init(exynos_drm_init); 723 module_exit(exynos_drm_exit); 724 725 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>"); 726 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 727 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>"); 728 MODULE_DESCRIPTION("Samsung SoC DRM Driver"); 729 MODULE_LICENSE("GPL"); 730