drivers/gpu/drm/rcar-du/rcar_du_kms.c

   1 /*
   2  * rcar_du_kms.c  --  R-Car Display Unit Mode Setting
   3  *
   4  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <drm/drmP.h>
  15 #include <drm/drm_atomic.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21
  22 #include <linux/of_graph.h>
  23 #include <linux/wait.h>
  24
  25 #include "rcar_du_crtc.h"
  26 #include "rcar_du_drv.h"
  27 #include "rcar_du_encoder.h"
  28 #include "rcar_du_kms.h"
  29 #include "rcar_du_lvdsenc.h"
  30 #include "rcar_du_regs.h"
  31
  32 /* -----------------------------------------------------------------------------
  33  * Format helpers
  34  */
  35
  36 static const struct rcar_du_format_info rcar_du_format_infos[] = {
  37         {
  38                 .fourcc = DRM_FORMAT_RGB565,
  39                 .bpp = 16,
  40                 .planes = 1,
  41                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  42                 .edf = PnDDCR4_EDF_NONE,
  43         }, {
  44                 .fourcc = DRM_FORMAT_ARGB1555,
  45                 .bpp = 16,
  46                 .planes = 1,
  47                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  48                 .edf = PnDDCR4_EDF_NONE,
  49         }, {
  50                 .fourcc = DRM_FORMAT_XRGB1555,
  51                 .bpp = 16,
  52                 .planes = 1,
  53                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  54                 .edf = PnDDCR4_EDF_NONE,
  55         }, {
  56                 .fourcc = DRM_FORMAT_XRGB8888,
  57                 .bpp = 32,
  58                 .planes = 1,
  59                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  60                 .edf = PnDDCR4_EDF_RGB888,
  61         }, {
  62                 .fourcc = DRM_FORMAT_ARGB8888,
  63                 .bpp = 32,
  64                 .planes = 1,
  65                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_16BPP,
  66                 .edf = PnDDCR4_EDF_ARGB8888,
  67         }, {
  68                 .fourcc = DRM_FORMAT_UYVY,
  69                 .bpp = 16,
  70                 .planes = 1,
  71                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  72                 .edf = PnDDCR4_EDF_NONE,
  73         }, {
  74                 .fourcc = DRM_FORMAT_YUYV,
  75                 .bpp = 16,
  76                 .planes = 1,
  77                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  78                 .edf = PnDDCR4_EDF_NONE,
  79         }, {
  80                 .fourcc = DRM_FORMAT_NV12,
  81                 .bpp = 12,
  82                 .planes = 2,
  83                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  84                 .edf = PnDDCR4_EDF_NONE,
  85         }, {
  86                 .fourcc = DRM_FORMAT_NV21,
  87                 .bpp = 12,
  88                 .planes = 2,
  89                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  90                 .edf = PnDDCR4_EDF_NONE,
  91         }, {
  92                 /* In YUV 4:2:2, only NV16 is supported (NV61 isn't) */
  93                 .fourcc = DRM_FORMAT_NV16,
  94                 .bpp = 16,
  95                 .planes = 2,
  96                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  97                 .edf = PnDDCR4_EDF_NONE,
  98         },
  99 };
 100
 101 const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
 102 {
 103         unsigned int i;
 104
 105         for (i = 0; i < ARRAY_SIZE(rcar_du_format_infos); ++i) {
 106                 if (rcar_du_format_infos[i].fourcc == fourcc)
 107                         return &rcar_du_format_infos[i];
 108         }
 109
 110         return NULL;
 111 }
 112
 113 /* -----------------------------------------------------------------------------
 114  * Frame buffer
 115  */
 116
 117 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 118                         struct drm_mode_create_dumb *args)
 119 {
 120         struct rcar_du_device *rcdu = dev->dev_private;
 121         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 122         unsigned int align;
 123
 124         /* The R8A7779 DU requires a 16 pixels pitch alignment as documented,
 125          * but the R8A7790 DU seems to require a 128 bytes pitch alignment.
 126          */
 127         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 128                 align = 128;
 129         else
 130                 align = 16 * args->bpp / 8;
 131
 132         args->pitch = roundup(min_pitch, align);
 133
 134         return drm_gem_cma_dumb_create_internal(file, dev, args);
 135 }
 136
 137 static struct drm_framebuffer *
 138 rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 139                   struct drm_mode_fb_cmd2 *mode_cmd)
 140 {
 141         struct rcar_du_device *rcdu = dev->dev_private;
 142         const struct rcar_du_format_info *format;
 143         unsigned int max_pitch;
 144         unsigned int align;
 145         unsigned int bpp;
 146
 147         format = rcar_du_format_info(mode_cmd->pixel_format);
 148         if (format == NULL) {
 149                 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
 150                         mode_cmd->pixel_format);
 151                 return ERR_PTR(-EINVAL);
 152         }
 153
 154         /*
 155          * The pitch and alignment constraints are expressed in pixels on the
 156          * hardware side and in bytes in the DRM API.
 157          */
 158         bpp = format->planes == 2 ? 1 : format->bpp / 8;
 159         max_pitch =  4096 * bpp;
 160
 161         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 162                 align = 128;
 163         else
 164                 align = 16 * bpp;
 165
 166         if (mode_cmd->pitches[0] & (align - 1) ||
 167             mode_cmd->pitches[0] >= max_pitch) {
 168                 dev_dbg(dev->dev, "invalid pitch value %u\n",
 169                         mode_cmd->pitches[0]);
 170                 return ERR_PTR(-EINVAL);
 171         }
 172
 173         if (format->planes == 2) {
 174                 if (mode_cmd->pitches[1] != mode_cmd->pitches[0]) {
 175                         dev_dbg(dev->dev,
 176                                 "luma and chroma pitches do not match\n");
 177                         return ERR_PTR(-EINVAL);
 178                 }
 179         }
 180
 181         return drm_fb_cma_create(dev, file_priv, mode_cmd);
 182 }
 183
 184 static void rcar_du_output_poll_changed(struct drm_device *dev)
 185 {
 186         struct rcar_du_device *rcdu = dev->dev_private;
 187
 188         drm_fbdev_cma_hotplug_event(rcdu->fbdev);
 189 }
 190
 191 /* -----------------------------------------------------------------------------
 192  * Atomic Check and Update
 193  */
 194
 195 /*
 196  * Atomic hardware plane allocator
 197  *
 198  * The hardware plane allocator is solely based on the atomic plane states
 199  * without keeping any external state to avoid races between .atomic_check()
 200  * and .atomic_commit().
 201  *
 202  * The core idea is to avoid using a free planes bitmask that would need to be
 203  * shared between check and commit handlers with a collective knowledge based on
 204  * the allocated hardware plane(s) for each KMS plane. The allocator then loops
 205  * over all plane states to compute the free planes bitmask, allocates hardware
 206  * planes based on that bitmask, and stores the result back in the plane states.
 207  *
 208  * For this to work we need to access the current state of planes not touched by
 209  * the atomic update. To ensure that it won't be modified, we need to lock all
 210  * planes using drm_atomic_get_plane_state(). This effectively serializes atomic
 211  * updates from .atomic_check() up to completion (when swapping the states if
 212  * the check step has succeeded) or rollback (when freeing the states if the
 213  * check step has failed).
 214  *
 215  * Allocation is performed in the .atomic_check() handler and applied
 216  * automatically when the core swaps the old and new states.
 217  */
 218
 219 static bool rcar_du_plane_needs_realloc(struct rcar_du_plane *plane,
 220                                         struct rcar_du_plane_state *state)
 221 {
 222         const struct rcar_du_format_info *cur_format;
 223
 224         cur_format = to_rcar_plane_state(plane->plane.state)->format;
 225
 226         /* Lowering the number of planes doesn't strictly require reallocation
 227          * as the extra hardware plane will be freed when committing, but doing
 228          * so could lead to more fragmentation.
 229          */
 230         return !cur_format || cur_format->planes != state->format->planes;
 231 }
 232
 233 static unsigned int rcar_du_plane_hwmask(struct rcar_du_plane_state *state)
 234 {
 235         unsigned int mask;
 236
 237         if (state->hwindex == -1)
 238                 return 0;
 239
 240         mask = 1 << state->hwindex;
 241         if (state->format->planes == 2)
 242                 mask |= 1 << ((state->hwindex + 1) % 8);
 243
 244         return mask;
 245 }
 246
 247 static int rcar_du_plane_hwalloc(unsigned int num_planes, unsigned int free)
 248 {
 249         unsigned int i;
 250
 251         for (i = 0; i < RCAR_DU_NUM_HW_PLANES; ++i) {
 252                 if (!(free & (1 << i)))
 253                         continue;
 254
 255                 if (num_planes == 1 || free & (1 << ((i + 1) % 8)))
 256                         break;
 257         }
 258
 259         return i == RCAR_DU_NUM_HW_PLANES ? -EBUSY : i;
 260 }
 261
 262 static int rcar_du_atomic_check(struct drm_device *dev,
 263                                 struct drm_atomic_state *state)
 264 {
 265         struct rcar_du_device *rcdu = dev->dev_private;
 266         unsigned int group_freed_planes[RCAR_DU_MAX_GROUPS] = { 0, };
 267         unsigned int group_free_planes[RCAR_DU_MAX_GROUPS] = { 0, };
 268         bool needs_realloc = false;
 269         unsigned int groups = 0;
 270         unsigned int i;
 271         int ret;
 272
 273         ret = drm_atomic_helper_check(dev, state);
 274         if (ret < 0)
 275                 return ret;
 276
 277         /* Check if hardware planes need to be reallocated. */
 278         for (i = 0; i < dev->mode_config.num_total_plane; ++i) {
 279                 struct rcar_du_plane_state *plane_state;
 280                 struct rcar_du_plane *plane;
 281                 unsigned int index;
 282
 283                 if (!state->planes[i])
 284                         continue;
 285
 286                 plane = to_rcar_plane(state->planes[i]);
 287                 plane_state = to_rcar_plane_state(state->plane_states[i]);
 288
 289                 dev_dbg(rcdu->dev, "%s: checking plane (%u,%u)\n", __func__,
 290                         plane->group->index, plane - plane->group->planes);
 291
 292                 /* If the plane is being disabled we don't need to go through
 293                  * the full reallocation procedure. Just mark the hardware
 294                  * plane(s) as freed.
 295                  */
 296                 if (!plane_state->format) {
 297                         dev_dbg(rcdu->dev, "%s: plane is being disabled\n",
 298                                 __func__);
 299                         index = plane - plane->group->planes;
 300                         group_freed_planes[plane->group->index] |= 1 << index;
 301                         plane_state->hwindex = -1;
 302                         continue;
 303                 }
 304
 305                 /* If the plane needs to be reallocated mark it as such, and
 306                  * mark the hardware plane(s) as free.
 307                  */
 308                 if (rcar_du_plane_needs_realloc(plane, plane_state)) {
 309                         dev_dbg(rcdu->dev, "%s: plane needs reallocation\n",
 310                                 __func__);
 311                         groups |= 1 << plane->group->index;
 312                         needs_realloc = true;
 313
 314                         index = plane - plane->group->planes;
 315                         group_freed_planes[plane->group->index] |= 1 << index;
 316                         plane_state->hwindex = -1;
 317                 }
 318         }
 319
 320         if (!needs_realloc)
 321                 return 0;
 322
 323         /* Grab all plane states for the groups that need reallocation to ensure
 324          * locking and avoid racy updates. This serializes the update operation,
 325          * but there's not much we can do about it as that's the hardware
 326          * design.
 327          *
 328          * Compute the used planes mask for each group at the same time to avoid
 329          * looping over the planes separately later.
 330          */
 331         while (groups) {
 332                 unsigned int index = ffs(groups) - 1;
 333                 struct rcar_du_group *group = &rcdu->groups[index];
 334                 unsigned int used_planes = 0;
 335
 336                 dev_dbg(rcdu->dev, "%s: finding free planes for group %u\n",
 337                         __func__, index);
 338
 339                 for (i = 0; i < group->num_planes; ++i) {
 340                         struct rcar_du_plane *plane = &group->planes[i];
 341                         struct rcar_du_plane_state *plane_state;
 342                         struct drm_plane_state *s;
 343
 344                         s = drm_atomic_get_plane_state(state, &plane->plane);
 345                         if (IS_ERR(s))
 346                                 return PTR_ERR(s);
 347
 348                         /* If the plane has been freed in the above loop its
 349                          * hardware planes must not be added to the used planes
 350                          * bitmask. However, the current state doesn't reflect
 351                          * the free state yet, as we've modified the new state
 352                          * above. Use the local freed planes list to check for
 353                          * that condition instead.
 354                          */
 355                         if (group_freed_planes[index] & (1 << i)) {
 356                                 dev_dbg(rcdu->dev,
 357                                         "%s: plane (%u,%u) has been freed, skipping\n",
 358                                         __func__, plane->group->index,
 359                                         plane - plane->group->planes);
 360                                 continue;
 361                         }
 362
 363                         plane_state = to_rcar_plane_state(plane->plane.state);
 364                         used_planes |= rcar_du_plane_hwmask(plane_state);
 365
 366                         dev_dbg(rcdu->dev,
 367                                 "%s: plane (%u,%u) uses %u hwplanes (index %d)\n",
 368                                 __func__, plane->group->index,
 369                                 plane - plane->group->planes,
 370                                 plane_state->format ?
 371                                 plane_state->format->planes : 0,
 372                                 plane_state->hwindex);
 373                 }
 374
 375                 group_free_planes[index] = 0xff & ~used_planes;
 376                 groups &= ~(1 << index);
 377
 378                 dev_dbg(rcdu->dev, "%s: group %u free planes mask 0x%02x\n",
 379                         __func__, index, group_free_planes[index]);
 380         }
 381
 382         /* Reallocate hardware planes for each plane that needs it. */
 383         for (i = 0; i < dev->mode_config.num_total_plane; ++i) {
 384                 struct rcar_du_plane_state *plane_state;
 385                 struct rcar_du_plane *plane;
 386                 unsigned int crtc_planes;
 387                 unsigned int free;
 388                 int idx;
 389
 390                 if (!state->planes[i])
 391                         continue;
 392
 393                 plane = to_rcar_plane(state->planes[i]);
 394                 plane_state = to_rcar_plane_state(state->plane_states[i]);
 395
 396                 dev_dbg(rcdu->dev, "%s: allocating plane (%u,%u)\n", __func__,
 397                         plane->group->index, plane - plane->group->planes);
 398
 399                 /* Skip planes that are being disabled or don't need to be
 400                  * reallocated.
 401                  */
 402                 if (!plane_state->format ||
 403                     !rcar_du_plane_needs_realloc(plane, plane_state))
 404                         continue;
 405
 406                 /* Try to allocate the plane from the free planes currently
 407                  * associated with the target CRTC to avoid restarting the CRTC
 408                  * group and thus minimize flicker. If it fails fall back to
 409                  * allocating from all free planes.
 410                  */
 411                 crtc_planes = to_rcar_crtc(plane_state->state.crtc)->index % 2
 412                             ? plane->group->dptsr_planes
 413                             : ~plane->group->dptsr_planes;
 414                 free = group_free_planes[plane->group->index];
 415
 416                 idx = rcar_du_plane_hwalloc(plane_state->format->planes,
 417                                             free & crtc_planes);
 418                 if (idx < 0)
 419                         idx = rcar_du_plane_hwalloc(plane_state->format->planes,
 420                                                     free);
 421                 if (idx < 0) {
 422                         dev_dbg(rcdu->dev, "%s: no available hardware plane\n",
 423                                 __func__);
 424                         return idx;
 425                 }
 426
 427                 dev_dbg(rcdu->dev, "%s: allocated %u hwplanes (index %u)\n",
 428                         __func__, plane_state->format->planes, idx);
 429
 430                 plane_state->hwindex = idx;
 431
 432                 group_free_planes[plane->group->index] &=
 433                         ~rcar_du_plane_hwmask(plane_state);
 434
 435                 dev_dbg(rcdu->dev, "%s: group %u free planes mask 0x%02x\n",
 436                         __func__, plane->group->index,
 437                         group_free_planes[plane->group->index]);
 438         }
 439
 440         return 0;
 441 }
 442
 443 struct rcar_du_commit {
 444         struct work_struct work;
 445         struct drm_device *dev;
 446         struct drm_atomic_state *state;
 447         u32 crtcs;
 448 };
 449
 450 static void rcar_du_atomic_complete(struct rcar_du_commit *commit)
 451 {
 452         struct drm_device *dev = commit->dev;
 453         struct rcar_du_device *rcdu = dev->dev_private;
 454         struct drm_atomic_state *old_state = commit->state;
 455
 456         /* Apply the atomic update. */
 457         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 458         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 459         drm_atomic_helper_commit_planes(dev, old_state);
 460
 461         drm_atomic_helper_wait_for_vblanks(dev, old_state);
 462
 463         drm_atomic_helper_cleanup_planes(dev, old_state);
 464
 465         drm_atomic_state_free(old_state);
 466
 467         /* Complete the commit, wake up any waiter. */
 468         spin_lock(&rcdu->commit.wait.lock);
 469         rcdu->commit.pending &= ~commit->crtcs;
 470         wake_up_all_locked(&rcdu->commit.wait);
 471         spin_unlock(&rcdu->commit.wait.lock);
 472
 473         kfree(commit);
 474 }
 475
 476 static void rcar_du_atomic_work(struct work_struct *work)
 477 {
 478         struct rcar_du_commit *commit =
 479                 container_of(work, struct rcar_du_commit, work);
 480
 481         rcar_du_atomic_complete(commit);
 482 }
 483
 484 static int rcar_du_atomic_commit(struct drm_device *dev,
 485                                  struct drm_atomic_state *state, bool async)
 486 {
 487         struct rcar_du_device *rcdu = dev->dev_private;
 488         struct rcar_du_commit *commit;
 489         unsigned int i;
 490         int ret;
 491
 492         ret = drm_atomic_helper_prepare_planes(dev, state);
 493         if (ret)
 494                 return ret;
 495
 496         /* Allocate the commit object. */
 497         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
 498         if (commit == NULL)
 499                 return -ENOMEM;
 500
 501         INIT_WORK(&commit->work, rcar_du_atomic_work);
 502         commit->dev = dev;
 503         commit->state = state;
 504
 505         /* Wait until all affected CRTCs have completed previous commits and
 506          * mark them as pending.
 507          */
 508         for (i = 0; i < dev->mode_config.num_crtc; ++i) {
 509                 if (state->crtcs[i])
 510                         commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]);
 511         }
 512
 513         spin_lock(&rcdu->commit.wait.lock);
 514         ret = wait_event_interruptible_locked(rcdu->commit.wait,
 515                         !(rcdu->commit.pending & commit->crtcs));
 516         if (ret == 0)
 517                 rcdu->commit.pending |= commit->crtcs;
 518         spin_unlock(&rcdu->commit.wait.lock);
 519
 520         if (ret) {
 521                 kfree(commit);
 522                 return ret;
 523         }
 524
 525         /* Swap the state, this is the point of no return. */
 526         drm_atomic_helper_swap_state(dev, state);
 527
 528         if (async)
 529                 schedule_work(&commit->work);
 530         else
 531                 rcar_du_atomic_complete(commit);
 532
 533         return 0;
 534 }
 535
 536 /* -----------------------------------------------------------------------------
 537  * Initialization
 538  */
 539
 540 static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
 541         .fb_create = rcar_du_fb_create,
 542         .output_poll_changed = rcar_du_output_poll_changed,
 543         .atomic_check = rcar_du_atomic_check,
 544         .atomic_commit = rcar_du_atomic_commit,
 545 };
 546
 547 static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 548                                      enum rcar_du_output output,
 549                                      struct of_endpoint *ep)
 550 {
 551         static const struct {
 552                 const char *compatible;
 553                 enum rcar_du_encoder_type type;
 554         } encoders[] = {
 555                 { "adi,adv7123", RCAR_DU_ENCODER_VGA },
 556                 { "adi,adv7511w", RCAR_DU_ENCODER_HDMI },
 557                 { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
 558         };
 559
 560         enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
 561         struct device_node *connector = NULL;
 562         struct device_node *encoder = NULL;
 563         struct device_node *ep_node = NULL;
 564         struct device_node *entity_ep_node;
 565         struct device_node *entity;
 566         int ret;
 567
 568         /*
 569          * Locate the connected entity and infer its type from the number of
 570          * endpoints.
 571          */
 572         entity = of_graph_get_remote_port_parent(ep->local_node);
 573         if (!entity) {
 574                 dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n",
 575                         ep->local_node->full_name);
 576                 return 0;
 577         }
 578
 579         entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);
 580
 581         for_each_endpoint_of_node(entity, ep_node) {
 582                 if (ep_node == entity_ep_node)
 583                         continue;
 584
 585                 /*
 586                  * We've found one endpoint other than the input, this must
 587                  * be an encoder. Locate the connector.
 588                  */
 589                 encoder = entity;
 590                 connector = of_graph_get_remote_port_parent(ep_node);
 591                 of_node_put(ep_node);
 592
 593                 if (!connector) {
 594                         dev_warn(rcdu->dev,
 595                                  "no connector for encoder %s, skipping\n",
 596                                  encoder->full_name);
 597                         of_node_put(entity_ep_node);
 598                         of_node_put(encoder);
 599                         return 0;
 600                 }
 601
 602                 break;
 603         }
 604
 605         of_node_put(entity_ep_node);
 606
 607         if (encoder) {
 608                 /*
 609                  * If an encoder has been found, get its type based on its
 610                  * compatible string.
 611                  */
 612                 unsigned int i;
 613
 614                 for (i = 0; i < ARRAY_SIZE(encoders); ++i) {
 615                         if (of_device_is_compatible(encoder,
 616                                                     encoders[i].compatible)) {
 617                                 enc_type = encoders[i].type;
 618                                 break;
 619                         }
 620                 }
 621
 622                 if (i == ARRAY_SIZE(encoders)) {
 623                         dev_warn(rcdu->dev,
 624                                  "unknown encoder type for %s, skipping\n",
 625                                  encoder->full_name);
 626                         of_node_put(encoder);
 627                         of_node_put(connector);
 628                         return 0;
 629                 }
 630         } else {
 631                 /*
 632                  * If no encoder has been found the entity must be the
 633                  * connector.
 634                  */
 635                 connector = entity;
 636         }
 637
 638         ret = rcar_du_encoder_init(rcdu, enc_type, output, encoder, connector);
 639         of_node_put(encoder);
 640         of_node_put(connector);
 641
 642         return ret < 0 ? ret : 1;
 643 }
 644
 645 static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 646 {
 647         struct device_node *np = rcdu->dev->of_node;
 648         struct device_node *ep_node;
 649         unsigned int num_encoders = 0;
 650
 651         /*
 652          * Iterate over the endpoints and create one encoder for each output
 653          * pipeline.
 654          */
 655         for_each_endpoint_of_node(np, ep_node) {
 656                 enum rcar_du_output output;
 657                 struct of_endpoint ep;
 658                 unsigned int i;
 659                 int ret;
 660
 661                 ret = of_graph_parse_endpoint(ep_node, &ep);
 662                 if (ret < 0) {
 663                         of_node_put(ep_node);
 664                         return ret;
 665                 }
 666
 667                 /* Find the output route corresponding to the port number. */
 668                 for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
 669                         if (rcdu->info->routes[i].possible_crtcs &&
 670                             rcdu->info->routes[i].port == ep.port) {
 671                                 output = i;
 672                                 break;
 673                         }
 674                 }
 675
 676                 if (i == RCAR_DU_OUTPUT_MAX) {
 677                         dev_warn(rcdu->dev,
 678                                  "port %u references unexisting output, skipping\n",
 679                                  ep.port);
 680                         continue;
 681                 }
 682
 683                 /* Process the output pipeline. */
 684                 ret = rcar_du_encoders_init_one(rcdu, output, &ep);
 685                 if (ret < 0) {
 686                         if (ret == -EPROBE_DEFER) {
 687                                 of_node_put(ep_node);
 688                                 return ret;
 689                         }
 690
 691                         dev_info(rcdu->dev,
 692                                  "encoder initialization failed, skipping\n");
 693                         continue;
 694                 }
 695
 696                 num_encoders += ret;
 697         }
 698
 699         return num_encoders;
 700 }
 701
 702 static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 703 {
 704         rcdu->props.alpha =
 705                 drm_property_create_range(rcdu->ddev, 0, "alpha", 0, 255);
 706         if (rcdu->props.alpha == NULL)
 707                 return -ENOMEM;
 708
 709         /* The color key is expressed as an RGB888 triplet stored in a 32-bit
 710          * integer in XRGB8888 format. Bit 24 is used as a flag to disable (0)
 711          * or enable source color keying (1).
 712          */
 713         rcdu->props.colorkey =
 714                 drm_property_create_range(rcdu->ddev, 0, "colorkey",
 715                                           0, 0x01ffffff);
 716         if (rcdu->props.colorkey == NULL)
 717                 return -ENOMEM;
 718
 719         rcdu->props.zpos =
 720                 drm_property_create_range(rcdu->ddev, 0, "zpos", 1, 7);
 721         if (rcdu->props.zpos == NULL)
 722                 return -ENOMEM;
 723
 724         return 0;
 725 }
 726
 727 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 728 {
 729         static const unsigned int mmio_offsets[] = {
 730                 DU0_REG_OFFSET, DU2_REG_OFFSET
 731         };
 732
 733         struct drm_device *dev = rcdu->ddev;
 734         struct drm_encoder *encoder;
 735         struct drm_fbdev_cma *fbdev;
 736         unsigned int num_encoders;
 737         unsigned int num_groups;
 738         unsigned int i;
 739         int ret;
 740
 741         drm_mode_config_init(dev);
 742
 743         dev->mode_config.min_width = 0;
 744         dev->mode_config.min_height = 0;
 745         dev->mode_config.max_width = 4095;
 746         dev->mode_config.max_height = 2047;
 747         dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 748
 749         rcdu->num_crtcs = rcdu->info->num_crtcs;
 750
 751         ret = rcar_du_properties_init(rcdu);
 752         if (ret < 0)
 753                 return ret;
 754
 755         /* Initialize the groups. */
 756         num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
 757
 758         for (i = 0; i < num_groups; ++i) {
 759                 struct rcar_du_group *rgrp = &rcdu->groups[i];
 760
 761                 mutex_init(&rgrp->lock);
 762
 763                 rgrp->dev = rcdu;
 764                 rgrp->mmio_offset = mmio_offsets[i];
 765                 rgrp->index = i;
 766                 rgrp->num_crtcs = min(rcdu->num_crtcs - 2 * i, 2U);
 767
 768                 /* If we have more than one CRTCs in this group pre-associate
 769                  * planes 0-3 with CRTC 0 and planes 4-7 with CRTC 1 to minimize
 770                  * flicker occurring when the association is changed.
 771                  */
 772                 rgrp->dptsr_planes = rgrp->num_crtcs > 1 ? 0xf0 : 0;
 773
 774                 ret = rcar_du_planes_init(rgrp);
 775                 if (ret < 0)
 776                         return ret;
 777         }
 778
 779         /* Create the CRTCs. */
 780         for (i = 0; i < rcdu->num_crtcs; ++i) {
 781                 struct rcar_du_group *rgrp = &rcdu->groups[i / 2];
 782
 783                 ret = rcar_du_crtc_create(rgrp, i);
 784                 if (ret < 0)
 785                         return ret;
 786         }
 787
 788         /* Initialize the encoders. */
 789         ret = rcar_du_lvdsenc_init(rcdu);
 790         if (ret < 0)
 791                 return ret;
 792
 793         ret = rcar_du_encoders_init(rcdu);
 794         if (ret < 0)
 795                 return ret;
 796
 797         if (ret == 0) {
 798                 dev_err(rcdu->dev, "error: no encoder could be initialized\n");
 799                 return -EINVAL;
 800         }
 801
 802         num_encoders = ret;
 803
 804         /* Set the possible CRTCs and possible clones. There's always at least
 805          * one way for all encoders to clone each other, set all bits in the
 806          * possible clones field.
 807          */
 808         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 809                 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 810                 const struct rcar_du_output_routing *route =
 811                         &rcdu->info->routes[renc->output];
 812
 813                 encoder->possible_crtcs = route->possible_crtcs;
 814                 encoder->possible_clones = (1 << num_encoders) - 1;
 815         }
 816
 817         drm_mode_config_reset(dev);
 818
 819         drm_kms_helper_poll_init(dev);
 820
 821         if (dev->mode_config.num_connector) {
 822                 fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
 823                                            dev->mode_config.num_connector);
 824                 if (IS_ERR(fbdev))
 825                         return PTR_ERR(fbdev);
 826
 827                 rcdu->fbdev = fbdev;
 828         } else {
 829                 dev_info(rcdu->dev,
 830                          "no connector found, disabling fbdev emulation\n");
 831         }
 832
 833         return 0;
 834 }