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_crtc_vblank_off(crtc);
  75         }
  76
  77         if (manager->ops->dpms)
  78                 manager->ops->dpms(manager, mode);
  79
  80         exynos_crtc->dpms = mode;
  81
  82         if (mode == DRM_MODE_DPMS_ON)
  83                 drm_crtc_vblank_on(crtc);
  84 }
  85
  86 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
  87 {
  88         /* drm framework doesn't check NULL. */
  89 }
  90
  91 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
  92 {
  93         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  94         struct exynos_drm_manager *manager = exynos_crtc->manager;
  95
  96         exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
  97
  98         exynos_plane_commit(crtc->primary);
  99
 100         if (manager->ops->commit)
 101                 manager->ops->commit(manager);
 102
 103         exynos_plane_dpms(crtc->primary, DRM_MODE_DPMS_ON);
 104 }
 105
 106 static bool
 107 exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 108                             const struct drm_display_mode *mode,
 109                             struct drm_display_mode *adjusted_mode)
 110 {
 111         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 112         struct exynos_drm_manager *manager = exynos_crtc->manager;
 113
 114         if (manager->ops->mode_fixup)
 115                 return manager->ops->mode_fixup(manager, mode, adjusted_mode);
 116
 117         return true;
 118 }
 119
 120 static int
 121 exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 122                           struct drm_display_mode *adjusted_mode, int x, int y,
 123                           struct drm_framebuffer *old_fb)
 124 {
 125         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 126         struct exynos_drm_manager *manager = exynos_crtc->manager;
 127         struct drm_framebuffer *fb = crtc->primary->fb;
 128         unsigned int crtc_w;
 129         unsigned int crtc_h;
 130
 131         /*
 132          * copy the mode data adjusted by mode_fixup() into crtc->mode
 133          * so that hardware can be seet to proper mode.
 134          */
 135         memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
 136
 137         crtc_w = fb->width - x;
 138         crtc_h = fb->height - y;
 139
 140         if (manager->ops->mode_set)
 141                 manager->ops->mode_set(manager, &crtc->mode);
 142
 143         return exynos_plane_mode_set(crtc->primary, crtc, fb, 0, 0,
 144                                      crtc_w, crtc_h, x, y, crtc_w, crtc_h);
 145 }
 146
 147 static int exynos_drm_crtc_mode_set_commit(struct drm_crtc *crtc, int x, int y,
 148                                           struct drm_framebuffer *old_fb)
 149 {
 150         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 151         struct drm_framebuffer *fb = crtc->primary->fb;
 152         unsigned int crtc_w;
 153         unsigned int crtc_h;
 154         int ret;
 155
 156         /* when framebuffer changing is requested, crtc's dpms should be on */
 157         if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 158                 DRM_ERROR("failed framebuffer changing request.\n");
 159                 return -EPERM;
 160         }
 161
 162         crtc_w = fb->width - x;
 163         crtc_h = fb->height - y;
 164
 165         ret = exynos_plane_mode_set(crtc->primary, crtc, fb, 0, 0,
 166                                     crtc_w, crtc_h, x, y, crtc_w, crtc_h);
 167         if (ret)
 168                 return ret;
 169
 170         exynos_drm_crtc_commit(crtc);
 171
 172         return 0;
 173 }
 174
 175 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 176                                           struct drm_framebuffer *old_fb)
 177 {
 178         return exynos_drm_crtc_mode_set_commit(crtc, x, y, old_fb);
 179 }
 180
 181 static void exynos_drm_crtc_disable(struct drm_crtc *crtc)
 182 {
 183         struct drm_plane *plane;
 184         int ret;
 185
 186         exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 187
 188         drm_for_each_legacy_plane(plane, &crtc->dev->mode_config.plane_list) {
 189                 if (plane->crtc != crtc)
 190                         continue;
 191
 192                 ret = plane->funcs->disable_plane(plane);
 193                 if (ret)
 194                         DRM_ERROR("Failed to disable plane %d\n", ret);
 195         }
 196 }
 197
 198 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 199         .dpms           = exynos_drm_crtc_dpms,
 200         .prepare        = exynos_drm_crtc_prepare,
 201         .commit         = exynos_drm_crtc_commit,
 202         .mode_fixup     = exynos_drm_crtc_mode_fixup,
 203         .mode_set       = exynos_drm_crtc_mode_set,
 204         .mode_set_base  = exynos_drm_crtc_mode_set_base,
 205         .disable        = exynos_drm_crtc_disable,
 206 };
 207
 208 static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 209                                      struct drm_framebuffer *fb,
 210                                      struct drm_pending_vblank_event *event,
 211                                      uint32_t page_flip_flags)
 212 {
 213         struct drm_device *dev = crtc->dev;
 214         struct exynos_drm_private *dev_priv = dev->dev_private;
 215         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 216         struct drm_framebuffer *old_fb = crtc->primary->fb;
 217         int ret = -EINVAL;
 218
 219         /* when the page flip is requested, crtc's dpms should be on */
 220         if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 221                 DRM_ERROR("failed page flip request.\n");
 222                 return -EINVAL;
 223         }
 224
 225         mutex_lock(&dev->struct_mutex);
 226
 227         if (event) {
 228                 /*
 229                  * the pipe from user always is 0 so we can set pipe number
 230                  * of current owner to event.
 231                  */
 232                 event->pipe = exynos_crtc->pipe;
 233
 234                 ret = drm_vblank_get(dev, exynos_crtc->pipe);
 235                 if (ret) {
 236                         DRM_DEBUG("failed to acquire vblank counter\n");
 237
 238                         goto out;
 239                 }
 240
 241                 spin_lock_irq(&dev->event_lock);
 242                 list_add_tail(&event->base.link,
 243                                 &dev_priv->pageflip_event_list);
 244                 atomic_set(&exynos_crtc->pending_flip, 1);
 245                 spin_unlock_irq(&dev->event_lock);
 246
 247                 crtc->primary->fb = fb;
 248                 ret = exynos_drm_crtc_mode_set_commit(crtc, crtc->x, crtc->y,
 249                                                     NULL);
 250                 if (ret) {
 251                         crtc->primary->fb = old_fb;
 252
 253                         spin_lock_irq(&dev->event_lock);
 254                         drm_vblank_put(dev, exynos_crtc->pipe);
 255                         list_del(&event->base.link);
 256                         atomic_set(&exynos_crtc->pending_flip, 0);
 257                         spin_unlock_irq(&dev->event_lock);
 258
 259                         goto out;
 260                 }
 261         }
 262 out:
 263         mutex_unlock(&dev->struct_mutex);
 264         return ret;
 265 }
 266
 267 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
 268 {
 269         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 270         struct exynos_drm_private *private = crtc->dev->dev_private;
 271
 272         private->crtc[exynos_crtc->pipe] = NULL;
 273
 274         drm_crtc_cleanup(crtc);
 275         kfree(exynos_crtc);
 276 }
 277
 278 static int exynos_drm_crtc_set_property(struct drm_crtc *crtc,
 279                                         struct drm_property *property,
 280                                         uint64_t val)
 281 {
 282         struct drm_device *dev = crtc->dev;
 283         struct exynos_drm_private *dev_priv = dev->dev_private;
 284         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 285
 286         if (property == dev_priv->crtc_mode_property) {
 287                 enum exynos_crtc_mode mode = val;
 288
 289                 if (mode == exynos_crtc->mode)
 290                         return 0;
 291
 292                 exynos_crtc->mode = mode;
 293
 294                 switch (mode) {
 295                 case CRTC_MODE_NORMAL:
 296                         exynos_drm_crtc_commit(crtc);
 297                         break;
 298                 case CRTC_MODE_BLANK:
 299                         exynos_plane_dpms(crtc->primary, DRM_MODE_DPMS_OFF);
 300                         break;
 301                 default:
 302                         break;
 303                 }
 304
 305                 return 0;
 306         }
 307
 308         return -EINVAL;
 309 }
 310
 311 static struct drm_crtc_funcs exynos_crtc_funcs = {
 312         .set_config     = drm_crtc_helper_set_config,
 313         .page_flip      = exynos_drm_crtc_page_flip,
 314         .destroy        = exynos_drm_crtc_destroy,
 315         .set_property   = exynos_drm_crtc_set_property,
 316 };
 317
 318 static const struct drm_prop_enum_list mode_names[] = {
 319         { CRTC_MODE_NORMAL, "normal" },
 320         { CRTC_MODE_BLANK, "blank" },
 321 };
 322
 323 static void exynos_drm_crtc_attach_mode_property(struct drm_crtc *crtc)
 324 {
 325         struct drm_device *dev = crtc->dev;
 326         struct exynos_drm_private *dev_priv = dev->dev_private;
 327         struct drm_property *prop;
 328
 329         prop = dev_priv->crtc_mode_property;
 330         if (!prop) {
 331                 prop = drm_property_create_enum(dev, 0, "mode", mode_names,
 332                                                 ARRAY_SIZE(mode_names));
 333                 if (!prop)
 334                         return;
 335
 336                 dev_priv->crtc_mode_property = prop;
 337         }
 338
 339         drm_object_attach_property(&crtc->base, prop, 0);
 340 }
 341
 342 int exynos_drm_crtc_create(struct exynos_drm_manager *manager)
 343 {
 344         struct exynos_drm_crtc *exynos_crtc;
 345         struct drm_plane *plane;
 346         struct exynos_drm_private *private = manager->drm_dev->dev_private;
 347         struct drm_crtc *crtc;
 348         int ret;
 349
 350         exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 351         if (!exynos_crtc)
 352                 return -ENOMEM;
 353
 354         init_waitqueue_head(&exynos_crtc->pending_flip_queue);
 355         atomic_set(&exynos_crtc->pending_flip, 0);
 356
 357         exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
 358         exynos_crtc->manager = manager;
 359         exynos_crtc->pipe = manager->pipe;
 360         plane = exynos_plane_init(manager->drm_dev, 1 << manager->pipe,
 361                                   DRM_PLANE_TYPE_PRIMARY);
 362         if (IS_ERR(plane)) {
 363                 ret = PTR_ERR(plane);
 364                 goto err_plane;
 365         }
 366
 367         manager->crtc = &exynos_crtc->drm_crtc;
 368         crtc = &exynos_crtc->drm_crtc;
 369
 370         private->crtc[manager->pipe] = crtc;
 371
 372         ret = drm_crtc_init_with_planes(manager->drm_dev, crtc, plane, NULL,
 373                                         &exynos_crtc_funcs);
 374         if (ret < 0)
 375                 goto err_crtc;
 376
 377         drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
 378
 379         exynos_drm_crtc_attach_mode_property(crtc);
 380
 381         return 0;
 382
 383 err_crtc:
 384         plane->funcs->destroy(plane);
 385 err_plane:
 386         kfree(exynos_crtc);
 387         return ret;
 388 }
 389
 390 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int pipe)
 391 {
 392         struct exynos_drm_private *private = dev->dev_private;
 393         struct exynos_drm_crtc *exynos_crtc =
 394                 to_exynos_crtc(private->crtc[pipe]);
 395         struct exynos_drm_manager *manager = exynos_crtc->manager;
 396
 397         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 398                 return -EPERM;
 399
 400         if (manager->ops->enable_vblank)
 401                 manager->ops->enable_vblank(manager);
 402
 403         return 0;
 404 }
 405
 406 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int pipe)
 407 {
 408         struct exynos_drm_private *private = dev->dev_private;
 409         struct exynos_drm_crtc *exynos_crtc =
 410                 to_exynos_crtc(private->crtc[pipe]);
 411         struct exynos_drm_manager *manager = exynos_crtc->manager;
 412
 413         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 414                 return;
 415
 416         if (manager->ops->disable_vblank)
 417                 manager->ops->disable_vblank(manager);
 418 }
 419
 420 void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int pipe)
 421 {
 422         struct exynos_drm_private *dev_priv = dev->dev_private;
 423         struct drm_pending_vblank_event *e, *t;
 424         struct drm_crtc *drm_crtc = dev_priv->crtc[pipe];
 425         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(drm_crtc);
 426         unsigned long flags;
 427
 428         spin_lock_irqsave(&dev->event_lock, flags);
 429
 430         list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list,
 431                         base.link) {
 432                 /* if event's pipe isn't same as crtc then ignore it. */
 433                 if (pipe != e->pipe)
 434                         continue;
 435
 436                 list_del(&e->base.link);
 437                 drm_send_vblank_event(dev, -1, e);
 438                 drm_vblank_put(dev, pipe);
 439                 atomic_set(&exynos_crtc->pending_flip, 0);
 440                 wake_up(&exynos_crtc->pending_flip_queue);
 441         }
 442
 443         spin_unlock_irqrestore(&dev->event_lock, flags);
 444 }
 445
 446 void exynos_drm_crtc_plane_mode_set(struct drm_crtc *crtc,
 447                         struct exynos_drm_overlay *overlay)
 448 {
 449         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 450
 451         if (manager->ops->win_mode_set)
 452                 manager->ops->win_mode_set(manager, overlay);
 453 }
 454
 455 void exynos_drm_crtc_plane_commit(struct drm_crtc *crtc, int zpos)
 456 {
 457         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 458
 459         if (manager->ops->win_commit)
 460                 manager->ops->win_commit(manager, zpos);
 461 }
 462
 463 void exynos_drm_crtc_plane_enable(struct drm_crtc *crtc, int zpos)
 464 {
 465         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 466
 467         if (manager->ops->win_enable)
 468                 manager->ops->win_enable(manager, zpos);
 469 }
 470
 471 void exynos_drm_crtc_plane_disable(struct drm_crtc *crtc, int zpos)
 472 {
 473         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 474
 475         if (manager->ops->win_disable)
 476                 manager->ops->win_disable(manager, zpos);
 477 }
 478
 479 void exynos_drm_crtc_complete_scanout(struct drm_framebuffer *fb)
 480 {
 481         struct exynos_drm_manager *manager;
 482         struct drm_device *dev = fb->dev;
 483         struct drm_crtc *crtc;
 484
 485         /*
 486          * make sure that overlay data are updated to real hardware
 487          * for all encoders.
 488          */
 489         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 490                 manager = to_exynos_crtc(crtc)->manager;
 491
 492                 /*
 493                  * wait for vblank interrupt
 494                  * - this makes sure that overlay data are updated to
 495                  *      real hardware.
 496                  */
 497                 if (manager->ops->wait_for_vblank)
 498                         manager->ops->wait_for_vblank(manager);
 499         }
 500 }
 501
 502 int exynos_drm_crtc_get_pipe_from_type(struct drm_device *drm_dev,
 503                                         unsigned int out_type)
 504 {
 505         struct drm_crtc *crtc;
 506
 507         list_for_each_entry(crtc, &drm_dev->mode_config.crtc_list, head) {
 508                 struct exynos_drm_crtc *exynos_crtc;
 509
 510                 exynos_crtc = to_exynos_crtc(crtc);
 511                 if (exynos_crtc->manager->type == out_type)
 512                         return exynos_crtc->manager->pipe;
 513         }
 514
 515         return -EPERM;
 516 }
 517
 518 void exynos_drm_crtc_te_handler(struct drm_crtc *crtc)
 519 {
 520         struct exynos_drm_manager *manager = to_exynos_crtc(crtc)->manager;
 521
 522         if (manager->ops->te_handler)
 523                 manager->ops->te_handler(manager);
 524 }