drivers/gpu/drm/exynos/exynos_drm_crtc.c

   1 /* exynos_drm_crtc.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_crtc_helper.h>
  17
  18 #include "exynos_drm_crtc.h"
  19 #include "exynos_drm_drv.h"
  20 #include "exynos_drm_encoder.h"
  21 #include "exynos_drm_plane.h"
  22
  23 #define to_exynos_crtc(x)       container_of(x, struct exynos_drm_crtc,\
  24                                 drm_crtc)
  25
  26 enum exynos_crtc_mode {
  27         CRTC_MODE_NORMAL,       /* normal mode */
  28         CRTC_MODE_BLANK,        /* The private plane of crtc is blank */
  29 };
  30
  31 /*
  32  * Exynos specific crtc structure.
  33  *
  34  * @drm_crtc: crtc object.
  35  * @manager: the manager associated with this crtc
  36  * @pipe: a crtc index created at load() with a new crtc object creation
  37  *      and the crtc object would be set to private->crtc array
  38  *      to get a crtc object corresponding to this pipe from private->crtc
  39  *      array when irq interrupt occurred. the reason of using this pipe is that
  40  *      drm framework doesn't support multiple irq yet.
  41  *      we can refer to the crtc to current hardware interrupt occurred through
  42  *      this pipe value.
  43  * @dpms: store the crtc dpms value
  44  * @mode: store the crtc mode value
  45  */
  46 struct exynos_drm_crtc {
  47         struct drm_crtc                 drm_crtc;
  48         struct exynos_drm_manager       *manager;
  49         unsigned int                    pipe;
  50         unsigned int                    dpms;
  51         enum exynos_crtc_mode           mode;
  52         wait_queue_head_t               pending_flip_queue;
  53         atomic_t                        pending_flip;
  54 };
  55
  56 static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
  57 {
  58         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  59         struct exynos_drm_manager *manager = exynos_crtc->manager;
  60
  61         DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);
  62
  63         if (exynos_crtc->dpms == mode) {
  64                 DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
  65                 return;
  66         }
  67
  68         if (mode > DRM_MODE_DPMS_ON) {
  69                 /* wait for the completion of page flip. */
  70                 if (!wait_event_timeout(exynos_crtc->pending_flip_queue,
  71                                 !atomic_read(&exynos_crtc->pending_flip),
  72                                 HZ/20))
  73                         atomic_set(&exynos_crtc->pending_flip, 0);
  74                 drm_vblank_off(crtc->dev, exynos_crtc->pipe);
  75         }
  76
  77         if (manager->ops->dpms)
  78                 manager->ops->dpms(manager, mode);
  79
  80         exynos_crtc->dpms = mode;
  81 }
  82
  83 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
  84 {
  85         /* drm framework doesn't check NULL. */
  86 }
  87
  88 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
  89 {
  90         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  91         struct exynos_drm_manager *manager = exynos_crtc->manager;
  92
  93         exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
  94
  95         exynos_plane_commit(crtc->primary);
  96
  97         if (manager->ops->commit)
  98                 manager->ops->commit(manager);
  99
 100         exynos_plane_dpms(crtc->primary, DRM_MODE_DPMS_ON);
 101 }
 102
 103 static bool
 104 exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 105                             const struct drm_display_mode *mode,
 106                             struct drm_display_mode *adjusted_mode)
 107 {
 108         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 109         struct exynos_drm_manager *manager = exynos_crtc->manager;
 110
 111         if (manager->ops->mode_fixup)
 112                 return manager->ops->mode_fixup(manager, mode, adjusted_mode);
 113
 114         return true;
 115 }
 116
 117 static int
 118 exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 119                           struct drm_display_mode *adjusted_mode, int x, int y,
 120                           struct drm_framebuffer *old_fb)
 121 {
 122         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 123         struct exynos_drm_manager *manager = exynos_crtc->manager;
 124         struct drm_framebuffer *fb = crtc->primary->fb;
 125         unsigned int crtc_w;
 126         unsigned int crtc_h;
 127
 128         /*
 129          * copy the mode data adjusted by mode_fixup() into crtc->mode
 130          * so that hardware can be seet to proper mode.
 131          */
 132         memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
 133
 134         crtc_w = fb->width - x;
 135         crtc_h = fb->height - y;
 136
 137         if (manager->ops->mode_set)
 138                 manager->ops->mode_set(manager, &crtc->mode);
 139
 140         return exynos_plane_mode_set(crtc->primary, crtc, fb, 0, 0,
 141                                      crtc_w, crtc_h, x, y, crtc_w, crtc_h);
 142 }
 143
 144 static int exynos_drm_crtc_mode_set_commit(struct drm_crtc *crtc, int x, int y,
 145                                           struct drm_framebuffer *old_fb)
 146 {
 147         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 148         struct drm_framebuffer *fb = crtc->primary->fb;
 149         unsigned int crtc_w;
 150         unsigned int crtc_h;
 151         int ret;
 152
 153         /* when framebuffer changing is requested, crtc's dpms should be on */
 154         if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 155                 DRM_ERROR("failed framebuffer changing request.\n");
 156                 return -EPERM;
 157         }
 158
 159         crtc_w = fb->width - x;
 160         crtc_h = fb->height - y;
 161
 162         ret = exynos_plane_mode_set(crtc->primary, crtc, fb, 0, 0,
 163                                     crtc_w, crtc_h, x, y, crtc_w, crtc_h);
 164         if (ret)
 165                 return ret;
 166
 167         exynos_drm_crtc_commit(crtc);
 168
 169         return 0;
 170 }
 171
 172 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 173                                           struct drm_framebuffer *old_fb)
 174 {
 175         return exynos_drm_crtc_mode_set_commit(crtc, x, y, old_fb);
 176 }
 177
 178 static void exynos_drm_crtc_disable(struct drm_crtc *crtc)
 179 {
 180         struct drm_plane *plane;
 181         int ret;
 182
 183         exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 184
 185         drm_for_each_legacy_plane(plane, &crtc->dev->mode_config.plane_list) {
 186                 if (plane->crtc != crtc)
 187                         continue;
 188
 189                 ret = plane->funcs->disable_plane(plane);
 190                 if (ret)
 191                         DRM_ERROR("Failed to disable plane %d\n", ret);
 192         }
 193 }
 194
 195 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 196         .dpms           = exynos_drm_crtc_dpms,
 197         .prepare        = exynos_drm_crtc_prepare,
 198         .commit         = exynos_drm_crtc_commit,
 199         .mode_fixup     = exynos_drm_crtc_mode_fixup,
 200         .mode_set       = exynos_drm_crtc_mode_set,
 201         .mode_set_base  = exynos_drm_crtc_mode_set_base,
 202         .disable        = exynos_drm_crtc_disable,
 203 };
 204
 205 static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 206                                      struct drm_framebuffer *fb,
 207                                      struct drm_pending_vblank_event *event,
 208                                      uint32_t page_flip_flags)
 209 {
 210         struct drm_device *dev = crtc->dev;
 211         struct exynos_drm_private *dev_priv = dev->dev_private;
 212         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 213         struct drm_framebuffer *old_fb = crtc->primary->fb;
 214         int ret = -EINVAL;
 215
 216         /* when the page flip is requested, crtc's dpms should be on */
 217         if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 218                 DRM_ERROR("failed page flip request.\n");
 219                 return -EINVAL;
 220         }
 221
 222         mutex_lock(&dev->struct_mutex);
 223
 224         if (event) {
 225                 /*
 226                  * the pipe from user always is 0 so we can set pipe number
 227                  * of current owner to event.
 228                  */
 229                 event->pipe = exynos_crtc->pipe;
 230
 231                 ret = drm_vblank_get(dev, exynos_crtc->pipe);
 232                 if (ret) {
 233                         DRM_DEBUG("failed to acquire vblank counter\n");
 234
 235                         goto out;
 236                 }
 237
 238                 spin_lock_irq(&dev->event_lock);
 239                 list_add_tail(&event->base.link,
 240                                 &dev_priv->pageflip_event_list);
 241                 atomic_set(&exynos_crtc->pending_flip, 1);
 242                 spin_unlock_irq(&dev->event_lock);
 243
 244                 crtc->primary->fb = fb;
 245                 ret = exynos_drm_crtc_mode_set_commit(crtc, crtc->x, crtc->y,
 246                                                     NULL);
 247                 if (ret) {
 248                         crtc->primary->fb = old_fb;
 249
 250                         spin_lock_irq(&dev->event_lock);
 251                         drm_vblank_put(dev, exynos_crtc->pipe);
 252                         list_del(&event->base.link);
 253                         atomic_set(&exynos_crtc->pending_flip, 0);
 254                         spin_unlock_irq(&dev->event_lock);
 255
 256                         goto out;
 257                 }
 258         }
 259 out:
 260         mutex_unlock(&dev->struct_mutex);
 261         return ret;
 262 }
 263
 264 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
 265 {
 266         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 267         struct exynos_drm_private *private = crtc->dev->dev_private;
 268
 269         private->crtc[exynos_crtc->pipe] = NULL;
 270
 271         drm_crtc_cleanup(crtc);
 272         kfree(exynos_crtc);
 273 }
 274
 275 static int exynos_drm_crtc_set_property(struct drm_crtc *crtc,
 276                                         struct drm_property *property,
 277                                         uint64_t val)
 278 {
 279         struct drm_device *dev = crtc->dev;
 280         struct exynos_drm_private *dev_priv = dev->dev_private;
 281         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 282
 283         if (property == dev_priv->crtc_mode_property) {
 284                 enum exynos_crtc_mode mode = val;
 285
 286                 if (mode == exynos_crtc->mode)
 287                         return 0;
 288
 289                 exynos_crtc->mode = mode;
 290
 291                 switch (mode) {
 292                 case CRTC_MODE_NORMAL:
 293                         exynos_drm_crtc_commit(crtc);
 294                         break;
 295                 case CRTC_MODE_BLANK:
 296                         exynos_plane_dpms(crtc->primary, DRM_MODE_DPMS_OFF);
 297                         break;
 298                 default:
 299                         break;
 300                 }
 301
 302                 return 0;
 303         }
 304
 305         return -EINVAL;
 306 }
 307
 308 static struct drm_crtc_funcs exynos_crtc_funcs = {
 309         .set_config     = drm_crtc_helper_set_config,
 310         .page_flip      = exynos_drm_crtc_page_flip,
 311         .destroy        = exynos_drm_crtc_destroy,
 312         .set_property   = exynos_drm_crtc_set_property,
 313 };
 314
 315 static const struct drm_prop_enum_list mode_names[] = {
 316         { CRTC_MODE_NORMAL, "normal" },
 317         { CRTC_MODE_BLANK, "blank" },
 318 };
 319
 320 static void exynos_drm_crtc_attach_mode_property(struct drm_crtc *crtc)
 321 {
 322         struct drm_device *dev = crtc->dev;
 323         struct exynos_drm_private *dev_priv = dev->dev_private;
 324         struct drm_property *prop;
 325
 326         prop = dev_priv->crtc_mode_property;
 327         if (!prop) {
 328                 prop = drm_property_create_enum(dev, 0, "mode", mode_names,
 329                                                 ARRAY_SIZE(mode_names));
 330                 if (!prop)
 331                         return;
 332
 333                 dev_priv->crtc_mode_property = prop;
 334         }
 335
 336         drm_object_attach_property(&crtc->base, prop, 0);
 337 }
 338
 339 int exynos_drm_crtc_create(struct exynos_drm_manager *manager)
 340 {
 341         struct exynos_drm_crtc *exynos_crtc;
 342         struct drm_plane *plane;
 343         struct exynos_drm_private *private = manager->drm_dev->dev_private;
 344         struct drm_crtc *crtc;
 345         int ret;
 346
 347         exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 348         if (!exynos_crtc)
 349                 return -ENOMEM;
 350
 351         init_waitqueue_head(&exynos_crtc->pending_flip_queue);
 352         atomic_set(&exynos_crtc->pending_flip, 0);
 353
 354         exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
 355         exynos_crtc->manager = manager;
 356         exynos_crtc->pipe = manager->pipe;
 357         plane = exynos_plane_init(manager->drm_dev, 1 << manager->pipe,
 358                                   DRM_PLANE_TYPE_PRIMARY);
 359         if (IS_ERR(plane)) {
 360                 ret = PTR_ERR(plane);
 361                 goto err_plane;
 362         }
 363
 364         manager->crtc = &exynos_crtc->drm_crtc;
 365         crtc = &exynos_crtc->drm_crtc;
 366
 367         private->crtc[manager->pipe] = crtc;
 368
 369         ret = drm_crtc_init_with_planes(manager->drm_dev, crtc, plane, NULL,
 370                                         &exynos_crtc_funcs);
 371         if (ret < 0)
 372                 goto err_crtc;
 373
 374         drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
 375
 376         exynos_drm_crtc_attach_mode_property(crtc);
 377
 378         return 0;
 379
 380 err_crtc:
 381         plane->funcs->destroy(plane);
 382 err_plane:
 383         kfree(exynos_crtc);
 384         return ret;
 385 }
 386
 387 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int pipe)
 388 {
 389         struct exynos_drm_private *private = dev->dev_private;
 390         struct exynos_drm_crtc *exynos_crtc =
 391                 to_exynos_crtc(private->crtc[pipe]);
 392         struct exynos_drm_manager *manager = exynos_crtc->manager;
 393
 394         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 395                 return -EPERM;
 396
 397         if (manager->ops->enable_vblank)
 398                 manager->ops->enable_vblank(manager);
 399
 400         return 0;
 401 }
 402
 403 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int pipe)
 404 {
 405         struct exynos_drm_private *private = dev->dev_private;
 406         struct exynos_drm_crtc *exynos_crtc =
 407                 to_exynos_crtc(private->crtc[pipe]);
 408         struct exynos_drm_manager *manager = exynos_crtc->manager;
 409
 410         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 411                 return;
 412
 413         if (manager->ops->disable_vblank)
 414                 manager->ops->disable_vblank(manager);
 415 }
 416
 417 void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int pipe)
 418 {
 419         struct exynos_drm_private *dev_priv = dev->dev_private;
 420         struct drm_pending_vblank_event *e, *t;
 421         struct drm_crtc *drm_crtc = dev_priv->crtc[pipe];
 422         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(drm_crtc);
 423         unsigned long flags;
 424
 425         spin_lock_irqsave(&dev->event_lock, flags);
 426
 427         list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list,
 428                         base.link) {
 429                 /* if event's pipe isn't same as crtc then ignore it. */
 430                 if (pipe != e->pipe)
 431                         continue;
 432
 433                 list_del(&e->base.link);
 434                 drm_send_vblank_event(dev, -1, e);
 435                 drm_vblank_put(dev, pipe);
 436                 atomic_set(&exynos_crtc->pending_flip, 0);
 437                 wake_up(&exynos_crtc->pending_flip_queue);
 438         }
 439
 440         spin_unlock_irqrestore(&dev->event_lock, flags);
 441 }
 442
 443 void exynos_drm_crtc_plane_mode_set(struct drm_crtc *crtc,
 444                         struct exynos_drm_overlay *overlay)
 445 {
 446         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 447
 448         if (manager->ops->win_mode_set)
 449                 manager->ops->win_mode_set(manager, overlay);
 450 }
 451
 452 void exynos_drm_crtc_plane_commit(struct drm_crtc *crtc, int zpos)
 453 {
 454         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 455
 456         if (manager->ops->win_commit)
 457                 manager->ops->win_commit(manager, zpos);
 458 }
 459
 460 void exynos_drm_crtc_plane_enable(struct drm_crtc *crtc, int zpos)
 461 {
 462         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 463
 464         if (manager->ops->win_enable)
 465                 manager->ops->win_enable(manager, zpos);
 466 }
 467
 468 void exynos_drm_crtc_plane_disable(struct drm_crtc *crtc, int zpos)
 469 {
 470         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 471
 472         if (manager->ops->win_disable)
 473                 manager->ops->win_disable(manager, zpos);
 474 }
 475
 476 void exynos_drm_crtc_complete_scanout(struct drm_framebuffer *fb)
 477 {
 478         struct exynos_drm_manager *manager;
 479         struct drm_device *dev = fb->dev;
 480         struct drm_crtc *crtc;
 481
 482         /*
 483          * make sure that overlay data are updated to real hardware
 484          * for all encoders.
 485          */
 486         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 487                 manager = to_exynos_crtc(crtc)->manager;
 488
 489                 /*
 490                  * wait for vblank interrupt
 491                  * - this makes sure that overlay data are updated to
 492                  *      real hardware.
 493                  */
 494                 if (manager->ops->wait_for_vblank)
 495                         manager->ops->wait_for_vblank(manager);
 496         }
 497 }
 498
 499 int exynos_drm_crtc_get_pipe_from_type(struct drm_device *drm_dev,
 500                                         unsigned int out_type)
 501 {
 502         struct drm_crtc *crtc;
 503
 504         list_for_each_entry(crtc, &drm_dev->mode_config.crtc_list, head) {
 505                 struct exynos_drm_crtc *exynos_crtc;
 506
 507                 exynos_crtc = to_exynos_crtc(crtc);
 508                 if (exynos_crtc->manager->type == out_type)
 509                         return exynos_crtc->manager->pipe;
 510         }
 511
 512         return -EPERM;
 513 }
 514
 515 void exynos_drm_crtc_te_handler(struct drm_crtc *crtc)
 516 {
 517         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 518
 519         if (manager->ops->te_handler)
 520                 manager->ops->te_handler(manager);
 521 }