Version:  2.0.40 2.2.26 2.4.37 3.9 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

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         /*
216          * with vblank_disable_allowed = true, vblank interrupt will be disabled
217          * by drm timer once a current process gives up ownership of
218          * vblank event.(after drm_vblank_put function is called)
219          */
220         dev->vblank_disable_allowed = true;
221 
222         /* init kms poll for handling hpd */
223         drm_kms_helper_poll_init(dev);
224 
225         /* force connectors detection */
226         drm_helper_hpd_irq_event(dev);
227 
228         return 0;
229 
230 err_cleanup_vblank:
231         drm_vblank_cleanup(dev);
232 err_unbind_all:
233         component_unbind_all(dev->dev, dev);
234 err_mode_config_cleanup:
235         drm_mode_config_cleanup(dev);
236         drm_release_iommu_mapping(dev);
237 err_free_private:
238         kfree(private);
239 
240         return ret;
241 }
242 
243 static int exynos_drm_unload(struct drm_device *dev)
244 {
245         exynos_drm_device_subdrv_remove(dev);
246 
247         exynos_drm_fbdev_fini(dev);
248         drm_kms_helper_poll_fini(dev);
249 
250         drm_vblank_cleanup(dev);
251         component_unbind_all(dev->dev, dev);
252         drm_mode_config_cleanup(dev);
253         drm_release_iommu_mapping(dev);
254 
255         kfree(dev->dev_private);
256         dev->dev_private = NULL;
257 
258         return 0;
259 }
260 
261 static int commit_is_pending(struct exynos_drm_private *priv, u32 crtcs)
262 {
263         bool pending;
264 
265         spin_lock(&priv->lock);
266         pending = priv->pending & crtcs;
267         spin_unlock(&priv->lock);
268 
269         return pending;
270 }
271 
272 int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state,
273                          bool async)
274 {
275         struct exynos_drm_private *priv = dev->dev_private;
276         struct exynos_atomic_commit *commit;
277         int i, ret;
278 
279         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
280         if (!commit)
281                 return -ENOMEM;
282 
283         ret = drm_atomic_helper_prepare_planes(dev, state);
284         if (ret) {
285                 kfree(commit);
286                 return ret;
287         }
288 
289         /* This is the point of no return */
290 
291         INIT_WORK(&commit->work, exynos_drm_atomic_work);
292         commit->dev = dev;
293         commit->state = state;
294 
295         /* Wait until all affected CRTCs have completed previous commits and
296          * mark them as pending.
297          */
298         for (i = 0; i < dev->mode_config.num_crtc; ++i) {
299                 if (state->crtcs[i])
300                         commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]);
301         }
302 
303         wait_event(priv->wait, !commit_is_pending(priv, commit->crtcs));
304 
305         spin_lock(&priv->lock);
306         priv->pending |= commit->crtcs;
307         spin_unlock(&priv->lock);
308 
309         drm_atomic_helper_swap_state(dev, state);
310 
311         if (async)
312                 schedule_work(&commit->work);
313         else
314                 exynos_atomic_commit_complete(commit);
315 
316         return 0;
317 }
318 
319 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
320 {
321         struct drm_exynos_file_private *file_priv;
322         int ret;
323 
324         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
325         if (!file_priv)
326                 return -ENOMEM;
327 
328         file->driver_priv = file_priv;
329 
330         ret = exynos_drm_subdrv_open(dev, file);
331         if (ret)
332                 goto err_file_priv_free;
333 
334         return ret;
335 
336 err_file_priv_free:
337         kfree(file_priv);
338         file->driver_priv = NULL;
339         return ret;
340 }
341 
342 static void exynos_drm_preclose(struct drm_device *dev,
343                                         struct drm_file *file)
344 {
345         struct drm_crtc *crtc;
346 
347         exynos_drm_subdrv_close(dev, file);
348 
349         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
350                 exynos_drm_crtc_cancel_page_flip(crtc, file);
351 }
352 
353 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
354 {
355         kfree(file->driver_priv);
356         file->driver_priv = NULL;
357 }
358 
359 static void exynos_drm_lastclose(struct drm_device *dev)
360 {
361         exynos_drm_fbdev_restore_mode(dev);
362 }
363 
364 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
365         .fault = exynos_drm_gem_fault,
366         .open = drm_gem_vm_open,
367         .close = drm_gem_vm_close,
368 };
369 
370 static const struct drm_ioctl_desc exynos_ioctls[] = {
371         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
372                         DRM_AUTH | DRM_RENDER_ALLOW),
373         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
374                         DRM_AUTH | DRM_RENDER_ALLOW),
375         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
376                         DRM_RENDER_ALLOW),
377         DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
378                         DRM_AUTH),
379         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
380                         DRM_AUTH | DRM_RENDER_ALLOW),
381         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
382                         DRM_AUTH | DRM_RENDER_ALLOW),
383         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
384                         DRM_AUTH | DRM_RENDER_ALLOW),
385         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property,
386                         DRM_AUTH | DRM_RENDER_ALLOW),
387         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property,
388                         DRM_AUTH | DRM_RENDER_ALLOW),
389         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf,
390                         DRM_AUTH | DRM_RENDER_ALLOW),
391         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl,
392                         DRM_AUTH | DRM_RENDER_ALLOW),
393 };
394 
395 static const struct file_operations exynos_drm_driver_fops = {
396         .owner          = THIS_MODULE,
397         .open           = drm_open,
398         .mmap           = exynos_drm_gem_mmap,
399         .poll           = drm_poll,
400         .read           = drm_read,
401         .unlocked_ioctl = drm_ioctl,
402 #ifdef CONFIG_COMPAT
403         .compat_ioctl = drm_compat_ioctl,
404 #endif
405         .release        = drm_release,
406 };
407 
408 static struct drm_driver exynos_drm_driver = {
409         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
410                                   | DRIVER_ATOMIC | DRIVER_RENDER,
411         .load                   = exynos_drm_load,
412         .unload                 = exynos_drm_unload,
413         .open                   = exynos_drm_open,
414         .preclose               = exynos_drm_preclose,
415         .lastclose              = exynos_drm_lastclose,
416         .postclose              = exynos_drm_postclose,
417         .set_busid              = drm_platform_set_busid,
418         .get_vblank_counter     = drm_vblank_no_hw_counter,
419         .enable_vblank          = exynos_drm_crtc_enable_vblank,
420         .disable_vblank         = exynos_drm_crtc_disable_vblank,
421         .gem_free_object        = exynos_drm_gem_free_object,
422         .gem_vm_ops             = &exynos_drm_gem_vm_ops,
423         .dumb_create            = exynos_drm_gem_dumb_create,
424         .dumb_map_offset        = exynos_drm_gem_dumb_map_offset,
425         .dumb_destroy           = drm_gem_dumb_destroy,
426         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
427         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
428         .gem_prime_export       = drm_gem_prime_export,
429         .gem_prime_import       = drm_gem_prime_import,
430         .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table,
431         .gem_prime_import_sg_table      = exynos_drm_gem_prime_import_sg_table,
432         .gem_prime_vmap         = exynos_drm_gem_prime_vmap,
433         .gem_prime_vunmap       = exynos_drm_gem_prime_vunmap,
434         .ioctls                 = exynos_ioctls,
435         .num_ioctls             = ARRAY_SIZE(exynos_ioctls),
436         .fops                   = &exynos_drm_driver_fops,
437         .name   = DRIVER_NAME,
438         .desc   = DRIVER_DESC,
439         .date   = DRIVER_DATE,
440         .major  = DRIVER_MAJOR,
441         .minor  = DRIVER_MINOR,
442 };
443 
444 #ifdef CONFIG_PM_SLEEP
445 static int exynos_drm_suspend(struct device *dev)
446 {
447         struct drm_device *drm_dev = dev_get_drvdata(dev);
448         struct drm_connector *connector;
449 
450         if (pm_runtime_suspended(dev) || !drm_dev)
451                 return 0;
452 
453         drm_modeset_lock_all(drm_dev);
454         drm_for_each_connector(connector, drm_dev) {
455                 int old_dpms = connector->dpms;
456 
457                 if (connector->funcs->dpms)
458                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
459 
460                 /* Set the old mode back to the connector for resume */
461                 connector->dpms = old_dpms;
462         }
463         drm_modeset_unlock_all(drm_dev);
464 
465         return 0;
466 }
467 
468 static int exynos_drm_resume(struct device *dev)
469 {
470         struct drm_device *drm_dev = dev_get_drvdata(dev);
471         struct drm_connector *connector;
472 
473         if (pm_runtime_suspended(dev) || !drm_dev)
474                 return 0;
475 
476         drm_modeset_lock_all(drm_dev);
477         drm_for_each_connector(connector, drm_dev) {
478                 if (connector->funcs->dpms) {
479                         int dpms = connector->dpms;
480 
481                         connector->dpms = DRM_MODE_DPMS_OFF;
482                         connector->funcs->dpms(connector, dpms);
483                 }
484         }
485         drm_modeset_unlock_all(drm_dev);
486 
487         return 0;
488 }
489 #endif
490 
491 static const struct dev_pm_ops exynos_drm_pm_ops = {
492         SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume)
493 };
494 
495 /* forward declaration */
496 static struct platform_driver exynos_drm_platform_driver;
497 
498 struct exynos_drm_driver_info {
499         struct platform_driver *driver;
500         unsigned int flags;
501 };
502 
503 #define DRM_COMPONENT_DRIVER    BIT(0)  /* supports component framework */
504 #define DRM_VIRTUAL_DEVICE      BIT(1)  /* create virtual platform device */
505 #define DRM_DMA_DEVICE          BIT(2)  /* can be used for dma allocations */
506 
507 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
508 
509 /*
510  * Connector drivers should not be placed before associated crtc drivers,
511  * because connector requires pipe number of its crtc during initialization.
512  */
513 static struct exynos_drm_driver_info exynos_drm_drivers[] = {
514         {
515                 DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD),
516                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
517         }, {
518                 DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON),
519                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
520         }, {
521                 DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON),
522                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
523         }, {
524                 DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
525                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
526         }, {
527                 DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
528                 DRM_COMPONENT_DRIVER
529         }, {
530                 DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP),
531                 DRM_COMPONENT_DRIVER
532         }, {
533                 DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI),
534                 DRM_COMPONENT_DRIVER
535         }, {
536                 DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI),
537                 DRM_COMPONENT_DRIVER
538         }, {
539                 DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI),
540                 DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE
541         }, {
542                 DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D),
543         }, {
544                 DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC),
545         }, {
546                 DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR),
547         }, {
548                 DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC),
549         }, {
550                 DRV_PTR(ipp_driver, CONFIG_DRM_EXYNOS_IPP),
551                 DRM_VIRTUAL_DEVICE
552         }, {
553                 &exynos_drm_platform_driver,
554                 DRM_VIRTUAL_DEVICE
555         }
556 };
557 
558 static int compare_dev(struct device *dev, void *data)
559 {
560         return dev == (struct device *)data;
561 }
562 
563 static struct component_match *exynos_drm_match_add(struct device *dev)
564 {
565         struct component_match *match = NULL;
566         int i;
567 
568         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
569                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
570                 struct device *p = NULL, *d;
571 
572                 if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
573                         continue;
574 
575                 while ((d = bus_find_device(&platform_bus_type, p,
576                                             &info->driver->driver,
577                                             (void *)platform_bus_type.match))) {
578                         put_device(p);
579                         component_match_add(dev, &match, compare_dev, d);
580                         p = d;
581                 }
582                 put_device(p);
583         }
584 
585         return match ?: ERR_PTR(-ENODEV);
586 }
587 
588 static int exynos_drm_bind(struct device *dev)
589 {
590         return drm_platform_init(&exynos_drm_driver, to_platform_device(dev));
591 }
592 
593 static void exynos_drm_unbind(struct device *dev)
594 {
595         drm_put_dev(dev_get_drvdata(dev));
596 }
597 
598 static const struct component_master_ops exynos_drm_ops = {
599         .bind           = exynos_drm_bind,
600         .unbind         = exynos_drm_unbind,
601 };
602 
603 static int exynos_drm_platform_probe(struct platform_device *pdev)
604 {
605         struct component_match *match;
606 
607         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
608         exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls);
609 
610         match = exynos_drm_match_add(&pdev->dev);
611         if (IS_ERR(match))
612                 return PTR_ERR(match);
613 
614         return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
615                                                match);
616 }
617 
618 static int exynos_drm_platform_remove(struct platform_device *pdev)
619 {
620         component_master_del(&pdev->dev, &exynos_drm_ops);
621         return 0;
622 }
623 
624 static struct platform_driver exynos_drm_platform_driver = {
625         .probe  = exynos_drm_platform_probe,
626         .remove = exynos_drm_platform_remove,
627         .driver = {
628                 .name   = "exynos-drm",
629                 .pm     = &exynos_drm_pm_ops,
630         },
631 };
632 
633 static struct device *exynos_drm_get_dma_device(void)
634 {
635         int i;
636 
637         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
638                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
639                 struct device *dev;
640 
641                 if (!info->driver || !(info->flags & DRM_DMA_DEVICE))
642                         continue;
643 
644                 while ((dev = bus_find_device(&platform_bus_type, NULL,
645                                             &info->driver->driver,
646                                             (void *)platform_bus_type.match))) {
647                         put_device(dev);
648                         return dev;
649                 }
650         }
651         return NULL;
652 }
653 
654 static void exynos_drm_unregister_devices(void)
655 {
656         int i;
657 
658         for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
659                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
660                 struct device *dev;
661 
662                 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
663                         continue;
664 
665                 while ((dev = bus_find_device(&platform_bus_type, NULL,
666                                             &info->driver->driver,
667                                             (void *)platform_bus_type.match))) {
668                         put_device(dev);
669                         platform_device_unregister(to_platform_device(dev));
670                 }
671         }
672 }
673 
674 static int exynos_drm_register_devices(void)
675 {
676         struct platform_device *pdev;
677         int i;
678 
679         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
680                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
681 
682                 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
683                         continue;
684 
685                 pdev = platform_device_register_simple(
686                                         info->driver->driver.name, -1, NULL, 0);
687                 if (IS_ERR(pdev))
688                         goto fail;
689         }
690 
691         return 0;
692 fail:
693         exynos_drm_unregister_devices();
694         return PTR_ERR(pdev);
695 }
696 
697 static void exynos_drm_unregister_drivers(void)
698 {
699         int i;
700 
701         for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
702                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
703 
704                 if (!info->driver)
705                         continue;
706 
707                 platform_driver_unregister(info->driver);
708         }
709 }
710 
711 static int exynos_drm_register_drivers(void)
712 {
713         int i, ret;
714 
715         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
716                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
717 
718                 if (!info->driver)
719                         continue;
720 
721                 ret = platform_driver_register(info->driver);
722                 if (ret)
723                         goto fail;
724         }
725         return 0;
726 fail:
727         exynos_drm_unregister_drivers();
728         return ret;
729 }
730 
731 static int exynos_drm_init(void)
732 {
733         int ret;
734 
735         ret = exynos_drm_register_devices();
736         if (ret)
737                 return ret;
738 
739         ret = exynos_drm_register_drivers();
740         if (ret)
741                 goto err_unregister_pdevs;
742 
743         return 0;
744 
745 err_unregister_pdevs:
746         exynos_drm_unregister_devices();
747 
748         return ret;
749 }
750 
751 static void exynos_drm_exit(void)
752 {
753         exynos_drm_unregister_drivers();
754         exynos_drm_unregister_devices();
755 }
756 
757 module_init(exynos_drm_init);
758 module_exit(exynos_drm_exit);
759 
760 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
761 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
762 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
763 MODULE_DESCRIPTION("Samsung SoC DRM Driver");
764 MODULE_LICENSE("GPL");
765 

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