Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

Linux/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_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_wait_for_commit(struct drm_atomic_state *state)
 49 {
 50         struct drm_crtc_state *crtc_state;
 51         struct drm_crtc *crtc;
 52         int i, ret;
 53 
 54         for_each_crtc_in_state(state, crtc, crtc_state, i) {
 55                 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 56 
 57                 if (!crtc->state->enable)
 58                         continue;
 59 
 60                 ret = drm_crtc_vblank_get(crtc);
 61                 if (ret)
 62                         continue;
 63 
 64                 exynos_drm_crtc_wait_pending_update(exynos_crtc);
 65                 drm_crtc_vblank_put(crtc);
 66         }
 67 }
 68 
 69 static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit)
 70 {
 71         struct drm_device *dev = commit->dev;
 72         struct exynos_drm_private *priv = dev->dev_private;
 73         struct drm_atomic_state *state = commit->state;
 74         struct drm_plane *plane;
 75         struct drm_crtc *crtc;
 76         struct drm_plane_state *plane_state;
 77         struct drm_crtc_state *crtc_state;
 78         int i;
 79 
 80         drm_atomic_helper_commit_modeset_disables(dev, state);
 81 
 82         drm_atomic_helper_commit_modeset_enables(dev, state);
 83 
 84         /*
 85          * Exynos can't update planes with CRTCs and encoders disabled,
 86          * its updates routines, specially for FIMD, requires the clocks
 87          * to be enabled. So it is necessary to handle the modeset operations
 88          * *before* the commit_planes() step, this way it will always
 89          * have the relevant clocks enabled to perform the update.
 90          */
 91 
 92         for_each_crtc_in_state(state, crtc, crtc_state, i) {
 93                 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 94 
 95                 atomic_set(&exynos_crtc->pending_update, 0);
 96         }
 97 
 98         for_each_plane_in_state(state, plane, plane_state, i) {
 99                 struct exynos_drm_crtc *exynos_crtc =
100                                                 to_exynos_crtc(plane->crtc);
101 
102                 if (!plane->crtc)
103                         continue;
104 
105                 atomic_inc(&exynos_crtc->pending_update);
106         }
107 
108         drm_atomic_helper_commit_planes(dev, state, false);
109 
110         exynos_atomic_wait_for_commit(state);
111 
112         drm_atomic_helper_cleanup_planes(dev, state);
113 
114         drm_atomic_state_free(state);
115 
116         spin_lock(&priv->lock);
117         priv->pending &= ~commit->crtcs;
118         spin_unlock(&priv->lock);
119 
120         wake_up_all(&priv->wait);
121 
122         kfree(commit);
123 }
124 
125 static void exynos_drm_atomic_work(struct work_struct *work)
126 {
127         struct exynos_atomic_commit *commit = container_of(work,
128                                 struct exynos_atomic_commit, work);
129 
130         exynos_atomic_commit_complete(commit);
131 }
132 
133 static struct device *exynos_drm_get_dma_device(void);
134 
135 static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
136 {
137         struct exynos_drm_private *private;
138         struct drm_encoder *encoder;
139         unsigned int clone_mask;
140         int cnt, ret;
141 
142         private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL);
143         if (!private)
144                 return -ENOMEM;
145 
146         init_waitqueue_head(&private->wait);
147         spin_lock_init(&private->lock);
148 
149         dev_set_drvdata(dev->dev, dev);
150         dev->dev_private = (void *)private;
151 
152         /* the first real CRTC device is used for all dma mapping operations */
153         private->dma_dev = exynos_drm_get_dma_device();
154         if (!private->dma_dev) {
155                 DRM_ERROR("no device found for DMA mapping operations.\n");
156                 ret = -ENODEV;
157                 goto err_free_private;
158         }
159         DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
160                  dev_name(private->dma_dev));
161 
162         /*
163          * create mapping to manage iommu table and set a pointer to iommu
164          * mapping structure to iommu_mapping of private data.
165          * also this iommu_mapping can be used to check if iommu is supported
166          * or not.
167          */
168         ret = drm_create_iommu_mapping(dev);
169         if (ret < 0) {
170                 DRM_ERROR("failed to create iommu mapping.\n");
171                 goto err_free_private;
172         }
173 
174         drm_mode_config_init(dev);
175 
176         exynos_drm_mode_config_init(dev);
177 
178         /* setup possible_clones. */
179         cnt = 0;
180         clone_mask = 0;
181         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
182                 clone_mask |= (1 << (cnt++));
183 
184         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
185                 encoder->possible_clones = clone_mask;
186 
187         platform_set_drvdata(dev->platformdev, dev);
188 
189         /* Try to bind all sub drivers. */
190         ret = component_bind_all(dev->dev, dev);
191         if (ret)
192                 goto err_mode_config_cleanup;
193 
194         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
195         if (ret)
196                 goto err_unbind_all;
197 
198         /* Probe non kms sub drivers and virtual display driver. */
199         ret = exynos_drm_device_subdrv_probe(dev);
200         if (ret)
201                 goto err_cleanup_vblank;
202 
203         drm_mode_config_reset(dev);
204 
205         /*
206          * enable drm irq mode.
207          * - with irq_enabled = true, we can use the vblank feature.
208          *
209          * P.S. note that we wouldn't use drm irq handler but
210          *      just specific driver own one instead because
211          *      drm framework supports only one irq handler.
212          */
213         dev->irq_enabled = true;
214 
215         /* init kms poll for handling hpd */
216         drm_kms_helper_poll_init(dev);
217 
218         /* force connectors detection */
219         drm_helper_hpd_irq_event(dev);
220 
221         return 0;
222 
223 err_cleanup_vblank:
224         drm_vblank_cleanup(dev);
225 err_unbind_all:
226         component_unbind_all(dev->dev, dev);
227 err_mode_config_cleanup:
228         drm_mode_config_cleanup(dev);
229         drm_release_iommu_mapping(dev);
230 err_free_private:
231         kfree(private);
232 
233         return ret;
234 }
235 
236 static int exynos_drm_unload(struct drm_device *dev)
237 {
238         exynos_drm_device_subdrv_remove(dev);
239 
240         exynos_drm_fbdev_fini(dev);
241         drm_kms_helper_poll_fini(dev);
242 
243         drm_vblank_cleanup(dev);
244         component_unbind_all(dev->dev, dev);
245         drm_mode_config_cleanup(dev);
246         drm_release_iommu_mapping(dev);
247 
248         kfree(dev->dev_private);
249         dev->dev_private = NULL;
250 
251         return 0;
252 }
253 
254 static int commit_is_pending(struct exynos_drm_private *priv, u32 crtcs)
255 {
256         bool pending;
257 
258         spin_lock(&priv->lock);
259         pending = priv->pending & crtcs;
260         spin_unlock(&priv->lock);
261 
262         return pending;
263 }
264 
265 int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state,
266                          bool nonblock)
267 {
268         struct exynos_drm_private *priv = dev->dev_private;
269         struct exynos_atomic_commit *commit;
270         int i, ret;
271 
272         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
273         if (!commit)
274                 return -ENOMEM;
275 
276         ret = drm_atomic_helper_prepare_planes(dev, state);
277         if (ret) {
278                 kfree(commit);
279                 return ret;
280         }
281 
282         /* This is the point of no return */
283 
284         INIT_WORK(&commit->work, exynos_drm_atomic_work);
285         commit->dev = dev;
286         commit->state = state;
287 
288         /* Wait until all affected CRTCs have completed previous commits and
289          * mark them as pending.
290          */
291         for (i = 0; i < dev->mode_config.num_crtc; ++i) {
292                 if (state->crtcs[i])
293                         commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]);
294         }
295 
296         wait_event(priv->wait, !commit_is_pending(priv, commit->crtcs));
297 
298         spin_lock(&priv->lock);
299         priv->pending |= commit->crtcs;
300         spin_unlock(&priv->lock);
301 
302         drm_atomic_helper_swap_state(dev, state);
303 
304         if (nonblock)
305                 schedule_work(&commit->work);
306         else
307                 exynos_atomic_commit_complete(commit);
308 
309         return 0;
310 }
311 
312 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
313 {
314         struct drm_exynos_file_private *file_priv;
315         int ret;
316 
317         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
318         if (!file_priv)
319                 return -ENOMEM;
320 
321         file->driver_priv = file_priv;
322 
323         ret = exynos_drm_subdrv_open(dev, file);
324         if (ret)
325                 goto err_file_priv_free;
326 
327         return ret;
328 
329 err_file_priv_free:
330         kfree(file_priv);
331         file->driver_priv = NULL;
332         return ret;
333 }
334 
335 static void exynos_drm_preclose(struct drm_device *dev,
336                                         struct drm_file *file)
337 {
338         struct drm_crtc *crtc;
339 
340         exynos_drm_subdrv_close(dev, file);
341 
342         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
343                 exynos_drm_crtc_cancel_page_flip(crtc, file);
344 }
345 
346 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
347 {
348         kfree(file->driver_priv);
349         file->driver_priv = NULL;
350 }
351 
352 static void exynos_drm_lastclose(struct drm_device *dev)
353 {
354         exynos_drm_fbdev_restore_mode(dev);
355 }
356 
357 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
358         .fault = exynos_drm_gem_fault,
359         .open = drm_gem_vm_open,
360         .close = drm_gem_vm_close,
361 };
362 
363 static const struct drm_ioctl_desc exynos_ioctls[] = {
364         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
365                         DRM_AUTH | DRM_RENDER_ALLOW),
366         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
367                         DRM_AUTH | DRM_RENDER_ALLOW),
368         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
369                         DRM_RENDER_ALLOW),
370         DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
371                         DRM_AUTH),
372         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
373                         DRM_AUTH | DRM_RENDER_ALLOW),
374         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
375                         DRM_AUTH | DRM_RENDER_ALLOW),
376         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
377                         DRM_AUTH | DRM_RENDER_ALLOW),
378         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property,
379                         DRM_AUTH | DRM_RENDER_ALLOW),
380         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property,
381                         DRM_AUTH | DRM_RENDER_ALLOW),
382         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf,
383                         DRM_AUTH | DRM_RENDER_ALLOW),
384         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl,
385                         DRM_AUTH | DRM_RENDER_ALLOW),
386 };
387 
388 static const struct file_operations exynos_drm_driver_fops = {
389         .owner          = THIS_MODULE,
390         .open           = drm_open,
391         .mmap           = exynos_drm_gem_mmap,
392         .poll           = drm_poll,
393         .read           = drm_read,
394         .unlocked_ioctl = drm_ioctl,
395 #ifdef CONFIG_COMPAT
396         .compat_ioctl = drm_compat_ioctl,
397 #endif
398         .release        = drm_release,
399 };
400 
401 static struct drm_driver exynos_drm_driver = {
402         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
403                                   | DRIVER_ATOMIC | DRIVER_RENDER,
404         .load                   = exynos_drm_load,
405         .unload                 = exynos_drm_unload,
406         .open                   = exynos_drm_open,
407         .preclose               = exynos_drm_preclose,
408         .lastclose              = exynos_drm_lastclose,
409         .postclose              = exynos_drm_postclose,
410         .set_busid              = drm_platform_set_busid,
411         .get_vblank_counter     = drm_vblank_no_hw_counter,
412         .enable_vblank          = exynos_drm_crtc_enable_vblank,
413         .disable_vblank         = exynos_drm_crtc_disable_vblank,
414         .gem_free_object_unlocked = exynos_drm_gem_free_object,
415         .gem_vm_ops             = &exynos_drm_gem_vm_ops,
416         .dumb_create            = exynos_drm_gem_dumb_create,
417         .dumb_map_offset        = exynos_drm_gem_dumb_map_offset,
418         .dumb_destroy           = drm_gem_dumb_destroy,
419         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
420         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
421         .gem_prime_export       = drm_gem_prime_export,
422         .gem_prime_import       = drm_gem_prime_import,
423         .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table,
424         .gem_prime_import_sg_table      = exynos_drm_gem_prime_import_sg_table,
425         .gem_prime_vmap         = exynos_drm_gem_prime_vmap,
426         .gem_prime_vunmap       = exynos_drm_gem_prime_vunmap,
427         .gem_prime_mmap         = exynos_drm_gem_prime_mmap,
428         .ioctls                 = exynos_ioctls,
429         .num_ioctls             = ARRAY_SIZE(exynos_ioctls),
430         .fops                   = &exynos_drm_driver_fops,
431         .name   = DRIVER_NAME,
432         .desc   = DRIVER_DESC,
433         .date   = DRIVER_DATE,
434         .major  = DRIVER_MAJOR,
435         .minor  = DRIVER_MINOR,
436 };
437 
438 #ifdef CONFIG_PM_SLEEP
439 static int exynos_drm_suspend(struct device *dev)
440 {
441         struct drm_device *drm_dev = dev_get_drvdata(dev);
442         struct drm_connector *connector;
443 
444         if (pm_runtime_suspended(dev) || !drm_dev)
445                 return 0;
446 
447         drm_modeset_lock_all(drm_dev);
448         drm_for_each_connector(connector, drm_dev) {
449                 int old_dpms = connector->dpms;
450 
451                 if (connector->funcs->dpms)
452                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
453 
454                 /* Set the old mode back to the connector for resume */
455                 connector->dpms = old_dpms;
456         }
457         drm_modeset_unlock_all(drm_dev);
458 
459         return 0;
460 }
461 
462 static int exynos_drm_resume(struct device *dev)
463 {
464         struct drm_device *drm_dev = dev_get_drvdata(dev);
465         struct drm_connector *connector;
466 
467         if (pm_runtime_suspended(dev) || !drm_dev)
468                 return 0;
469 
470         drm_modeset_lock_all(drm_dev);
471         drm_for_each_connector(connector, drm_dev) {
472                 if (connector->funcs->dpms) {
473                         int dpms = connector->dpms;
474 
475                         connector->dpms = DRM_MODE_DPMS_OFF;
476                         connector->funcs->dpms(connector, dpms);
477                 }
478         }
479         drm_modeset_unlock_all(drm_dev);
480 
481         return 0;
482 }
483 #endif
484 
485 static const struct dev_pm_ops exynos_drm_pm_ops = {
486         SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume)
487 };
488 
489 /* forward declaration */
490 static struct platform_driver exynos_drm_platform_driver;
491 
492 struct exynos_drm_driver_info {
493         struct platform_driver *driver;
494         unsigned int flags;
495 };
496 
497 #define DRM_COMPONENT_DRIVER    BIT(0)  /* supports component framework */
498 #define DRM_VIRTUAL_DEVICE      BIT(1)  /* create virtual platform device */
499 #define DRM_DMA_DEVICE          BIT(2)  /* can be used for dma allocations */
500 
501 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
502 
503 /*
504  * Connector drivers should not be placed before associated crtc drivers,
505  * because connector requires pipe number of its crtc during initialization.
506  */
507 static struct exynos_drm_driver_info exynos_drm_drivers[] = {
508         {
509                 DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD),
510                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
511         }, {
512                 DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON),
513                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
514         }, {
515                 DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON),
516                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
517         }, {
518                 DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
519                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
520         }, {
521                 DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
522                 DRM_COMPONENT_DRIVER
523         }, {
524                 DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP),
525                 DRM_COMPONENT_DRIVER
526         }, {
527                 DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI),
528                 DRM_COMPONENT_DRIVER
529         }, {
530                 DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI),
531                 DRM_COMPONENT_DRIVER
532         }, {
533                 DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI),
534                 DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE
535         }, {
536                 DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D),
537         }, {
538                 DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC),
539         }, {
540                 DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR),
541         }, {
542                 DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC),
543         }, {
544                 DRV_PTR(ipp_driver, CONFIG_DRM_EXYNOS_IPP),
545                 DRM_VIRTUAL_DEVICE
546         }, {
547                 &exynos_drm_platform_driver,
548                 DRM_VIRTUAL_DEVICE
549         }
550 };
551 
552 static int compare_dev(struct device *dev, void *data)
553 {
554         return dev == (struct device *)data;
555 }
556 
557 static struct component_match *exynos_drm_match_add(struct device *dev)
558 {
559         struct component_match *match = NULL;
560         int i;
561 
562         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
563                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
564                 struct device *p = NULL, *d;
565 
566                 if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
567                         continue;
568 
569                 while ((d = bus_find_device(&platform_bus_type, p,
570                                             &info->driver->driver,
571                                             (void *)platform_bus_type.match))) {
572                         put_device(p);
573                         component_match_add(dev, &match, compare_dev, d);
574                         p = d;
575                 }
576                 put_device(p);
577         }
578 
579         return match ?: ERR_PTR(-ENODEV);
580 }
581 
582 static int exynos_drm_bind(struct device *dev)
583 {
584         return drm_platform_init(&exynos_drm_driver, to_platform_device(dev));
585 }
586 
587 static void exynos_drm_unbind(struct device *dev)
588 {
589         drm_put_dev(dev_get_drvdata(dev));
590 }
591 
592 static const struct component_master_ops exynos_drm_ops = {
593         .bind           = exynos_drm_bind,
594         .unbind         = exynos_drm_unbind,
595 };
596 
597 static int exynos_drm_platform_probe(struct platform_device *pdev)
598 {
599         struct component_match *match;
600 
601         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
602         exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls);
603 
604         match = exynos_drm_match_add(&pdev->dev);
605         if (IS_ERR(match))
606                 return PTR_ERR(match);
607 
608         return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
609                                                match);
610 }
611 
612 static int exynos_drm_platform_remove(struct platform_device *pdev)
613 {
614         component_master_del(&pdev->dev, &exynos_drm_ops);
615         return 0;
616 }
617 
618 static struct platform_driver exynos_drm_platform_driver = {
619         .probe  = exynos_drm_platform_probe,
620         .remove = exynos_drm_platform_remove,
621         .driver = {
622                 .name   = "exynos-drm",
623                 .pm     = &exynos_drm_pm_ops,
624         },
625 };
626 
627 static struct device *exynos_drm_get_dma_device(void)
628 {
629         int i;
630 
631         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
632                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
633                 struct device *dev;
634 
635                 if (!info->driver || !(info->flags & DRM_DMA_DEVICE))
636                         continue;
637 
638                 while ((dev = bus_find_device(&platform_bus_type, NULL,
639                                             &info->driver->driver,
640                                             (void *)platform_bus_type.match))) {
641                         put_device(dev);
642                         return dev;
643                 }
644         }
645         return NULL;
646 }
647 
648 static void exynos_drm_unregister_devices(void)
649 {
650         int i;
651 
652         for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
653                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
654                 struct device *dev;
655 
656                 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
657                         continue;
658 
659                 while ((dev = bus_find_device(&platform_bus_type, NULL,
660                                             &info->driver->driver,
661                                             (void *)platform_bus_type.match))) {
662                         put_device(dev);
663                         platform_device_unregister(to_platform_device(dev));
664                 }
665         }
666 }
667 
668 static int exynos_drm_register_devices(void)
669 {
670         struct platform_device *pdev;
671         int i;
672 
673         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
674                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
675 
676                 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
677                         continue;
678 
679                 pdev = platform_device_register_simple(
680                                         info->driver->driver.name, -1, NULL, 0);
681                 if (IS_ERR(pdev))
682                         goto fail;
683         }
684 
685         return 0;
686 fail:
687         exynos_drm_unregister_devices();
688         return PTR_ERR(pdev);
689 }
690 
691 static void exynos_drm_unregister_drivers(void)
692 {
693         int i;
694 
695         for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
696                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
697 
698                 if (!info->driver)
699                         continue;
700 
701                 platform_driver_unregister(info->driver);
702         }
703 }
704 
705 static int exynos_drm_register_drivers(void)
706 {
707         int i, ret;
708 
709         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
710                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
711 
712                 if (!info->driver)
713                         continue;
714 
715                 ret = platform_driver_register(info->driver);
716                 if (ret)
717                         goto fail;
718         }
719         return 0;
720 fail:
721         exynos_drm_unregister_drivers();
722         return ret;
723 }
724 
725 static int exynos_drm_init(void)
726 {
727         int ret;
728 
729         ret = exynos_drm_register_devices();
730         if (ret)
731                 return ret;
732 
733         ret = exynos_drm_register_drivers();
734         if (ret)
735                 goto err_unregister_pdevs;
736 
737         return 0;
738 
739 err_unregister_pdevs:
740         exynos_drm_unregister_devices();
741 
742         return ret;
743 }
744 
745 static void exynos_drm_exit(void)
746 {
747         exynos_drm_unregister_drivers();
748         exynos_drm_unregister_devices();
749 }
750 
751 module_init(exynos_drm_init);
752 module_exit(exynos_drm_exit);
753 
754 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
755 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
756 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
757 MODULE_DESCRIPTION("Samsung SoC DRM Driver");
758 MODULE_LICENSE("GPL");
759 

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