kernel/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_du_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_du_plane_state(state->plane_states[i]);
 288
 289                 /* If the plane is being disabled we don't need to go through
 290                  * the full reallocation procedure. Just mark the hardware
 291                  * plane(s) as freed.
 292                  */
 293                 if (!plane_state->format) {
 294                         index = plane - plane->group->planes.planes;
 295                         group_freed_planes[plane->group->index] |= 1 << index;
 296                         plane_state->hwindex = -1;
 297                         continue;
 298                 }
 299
 300                 /* If the plane needs to be reallocated mark it as such, and
 301                  * mark the hardware plane(s) as free.
 302                  */
 303                 if (rcar_du_plane_needs_realloc(plane, plane_state)) {
 304                         groups |= 1 << plane->group->index;
 305                         needs_realloc = true;
 306
 307                         index = plane - plane->group->planes.planes;
 308                         group_freed_planes[plane->group->index] |= 1 << index;
 309                         plane_state->hwindex = -1;
 310                 }
 311         }
 312
 313         if (!needs_realloc)
 314                 return 0;
 315
 316         /* Grab all plane states for the groups that need reallocation to ensure
 317          * locking and avoid racy updates. This serializes the update operation,
 318          * but there's not much we can do about it as that's the hardware
 319          * design.
 320          *
 321          * Compute the used planes mask for each group at the same time to avoid
 322          * looping over the planes separately later.
 323          */
 324         while (groups) {
 325                 unsigned int index = ffs(groups) - 1;
 326                 struct rcar_du_group *group = &rcdu->groups[index];
 327                 unsigned int used_planes = 0;
 328
 329                 for (i = 0; i < RCAR_DU_NUM_KMS_PLANES; ++i) {
 330                         struct rcar_du_plane *plane = &group->planes.planes[i];
 331                         struct rcar_du_plane_state *plane_state;
 332                         struct drm_plane_state *s;
 333
 334                         s = drm_atomic_get_plane_state(state, &plane->plane);
 335                         if (IS_ERR(s))
 336                                 return PTR_ERR(s);
 337
 338                         /* If the plane has been freed in the above loop its
 339                          * hardware planes must not be added to the used planes
 340                          * bitmask. However, the current state doesn't reflect
 341                          * the free state yet, as we've modified the new state
 342                          * above. Use the local freed planes list to check for
 343                          * that condition instead.
 344                          */
 345                         if (group_freed_planes[index] & (1 << i))
 346                                 continue;
 347
 348                         plane_state = to_rcar_du_plane_state(plane->plane.state);
 349                         used_planes |= rcar_du_plane_hwmask(plane_state);
 350                 }
 351
 352                 group_free_planes[index] = 0xff & ~used_planes;
 353                 groups &= ~(1 << index);
 354         }
 355
 356         /* Reallocate hardware planes for each plane that needs it. */
 357         for (i = 0; i < dev->mode_config.num_total_plane; ++i) {
 358                 struct rcar_du_plane_state *plane_state;
 359                 struct rcar_du_plane *plane;
 360                 int idx;
 361
 362                 if (!state->planes[i])
 363                         continue;
 364
 365                 plane = to_rcar_plane(state->planes[i]);
 366                 plane_state = to_rcar_du_plane_state(state->plane_states[i]);
 367
 368                 /* Skip planes that are being disabled or don't need to be
 369                  * reallocated.
 370                  */
 371                 if (!plane_state->format ||
 372                     !rcar_du_plane_needs_realloc(plane, plane_state))
 373                         continue;
 374
 375                 idx = rcar_du_plane_hwalloc(plane_state->format->planes,
 376                                         group_free_planes[plane->group->index]);
 377                 if (idx < 0) {
 378                         dev_dbg(rcdu->dev, "%s: no available hardware plane\n",
 379                                 __func__);
 380                         return idx;
 381                 }
 382
 383                 plane_state->hwindex = idx;
 384
 385                 group_free_planes[plane->group->index] &=
 386                         ~rcar_du_plane_hwmask(plane_state);
 387         }
 388
 389         return 0;
 390 }
 391
 392 struct rcar_du_commit {
 393         struct work_struct work;
 394         struct drm_device *dev;
 395         struct drm_atomic_state *state;
 396         u32 crtcs;
 397 };
 398
 399 static void rcar_du_atomic_complete(struct rcar_du_commit *commit)
 400 {
 401         struct drm_device *dev = commit->dev;
 402         struct rcar_du_device *rcdu = dev->dev_private;
 403         struct drm_atomic_state *old_state = commit->state;
 404
 405         /* Apply the atomic update. */
 406         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 407         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 408         drm_atomic_helper_commit_planes(dev, old_state);
 409
 410         drm_atomic_helper_wait_for_vblanks(dev, old_state);
 411
 412         drm_atomic_helper_cleanup_planes(dev, old_state);
 413
 414         drm_atomic_state_free(old_state);
 415
 416         /* Complete the commit, wake up any waiter. */
 417         spin_lock(&rcdu->commit.wait.lock);
 418         rcdu->commit.pending &= ~commit->crtcs;
 419         wake_up_all_locked(&rcdu->commit.wait);
 420         spin_unlock(&rcdu->commit.wait.lock);
 421
 422         kfree(commit);
 423 }
 424
 425 static void rcar_du_atomic_work(struct work_struct *work)
 426 {
 427         struct rcar_du_commit *commit =
 428                 container_of(work, struct rcar_du_commit, work);
 429
 430         rcar_du_atomic_complete(commit);
 431 }
 432
 433 static int rcar_du_atomic_commit(struct drm_device *dev,
 434                                  struct drm_atomic_state *state, bool async)
 435 {
 436         struct rcar_du_device *rcdu = dev->dev_private;
 437         struct rcar_du_commit *commit;
 438         unsigned int i;
 439         int ret;
 440
 441         ret = drm_atomic_helper_prepare_planes(dev, state);
 442         if (ret)
 443                 return ret;
 444
 445         /* Allocate the commit object. */
 446         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
 447         if (commit == NULL)
 448                 return -ENOMEM;
 449
 450         INIT_WORK(&commit->work, rcar_du_atomic_work);
 451         commit->dev = dev;
 452         commit->state = state;
 453
 454         /* Wait until all affected CRTCs have completed previous commits and
 455          * mark them as pending.
 456          */
 457         for (i = 0; i < dev->mode_config.num_crtc; ++i) {
 458                 if (state->crtcs[i])
 459                         commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]);
 460         }
 461
 462         spin_lock(&rcdu->commit.wait.lock);
 463         ret = wait_event_interruptible_locked(rcdu->commit.wait,
 464                         !(rcdu->commit.pending & commit->crtcs));
 465         if (ret == 0)
 466                 rcdu->commit.pending |= commit->crtcs;
 467         spin_unlock(&rcdu->commit.wait.lock);
 468
 469         if (ret) {
 470                 kfree(commit);
 471                 return ret;
 472         }
 473
 474         /* Swap the state, this is the point of no return. */
 475         drm_atomic_helper_swap_state(dev, state);
 476
 477         if (async)
 478                 schedule_work(&commit->work);
 479         else
 480                 rcar_du_atomic_complete(commit);
 481
 482         return 0;
 483 }
 484
 485 /* -----------------------------------------------------------------------------
 486  * Initialization
 487  */
 488
 489 static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
 490         .fb_create = rcar_du_fb_create,
 491         .output_poll_changed = rcar_du_output_poll_changed,
 492         .atomic_check = rcar_du_atomic_check,
 493         .atomic_commit = rcar_du_atomic_commit,
 494 };
 495
 496 static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 497                                      enum rcar_du_output output,
 498                                      struct of_endpoint *ep)
 499 {
 500         static const struct {
 501                 const char *compatible;
 502                 enum rcar_du_encoder_type type;
 503         } encoders[] = {
 504                 { "adi,adv7123", RCAR_DU_ENCODER_VGA },
 505                 { "adi,adv7511w", RCAR_DU_ENCODER_HDMI },
 506                 { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
 507         };
 508
 509         enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
 510         struct device_node *connector = NULL;
 511         struct device_node *encoder = NULL;
 512         struct device_node *ep_node = NULL;
 513         struct device_node *entity_ep_node;
 514         struct device_node *entity;
 515         int ret;
 516
 517         /*
 518          * Locate the connected entity and infer its type from the number of
 519          * endpoints.
 520          */
 521         entity = of_graph_get_remote_port_parent(ep->local_node);
 522         if (!entity) {
 523                 dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n",
 524                         ep->local_node->full_name);
 525                 return 0;
 526         }
 527
 528         entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);
 529
 530         for_each_endpoint_of_node(entity, ep_node) {
 531                 if (ep_node == entity_ep_node)
 532                         continue;
 533
 534                 /*
 535                  * We've found one endpoint other than the input, this must
 536                  * be an encoder. Locate the connector.
 537                  */
 538                 encoder = entity;
 539                 connector = of_graph_get_remote_port_parent(ep_node);
 540                 of_node_put(ep_node);
 541
 542                 if (!connector) {
 543                         dev_warn(rcdu->dev,
 544                                  "no connector for encoder %s, skipping\n",
 545                                  encoder->full_name);
 546                         of_node_put(entity_ep_node);
 547                         of_node_put(encoder);
 548                         return 0;
 549                 }
 550
 551                 break;
 552         }
 553
 554         of_node_put(entity_ep_node);
 555
 556         if (encoder) {
 557                 /*
 558                  * If an encoder has been found, get its type based on its
 559                  * compatible string.
 560                  */
 561                 unsigned int i;
 562
 563                 for (i = 0; i < ARRAY_SIZE(encoders); ++i) {
 564                         if (of_device_is_compatible(encoder,
 565                                                     encoders[i].compatible)) {
 566                                 enc_type = encoders[i].type;
 567                                 break;
 568                         }
 569                 }
 570
 571                 if (i == ARRAY_SIZE(encoders)) {
 572                         dev_warn(rcdu->dev,
 573                                  "unknown encoder type for %s, skipping\n",
 574                                  encoder->full_name);
 575                         of_node_put(encoder);
 576                         of_node_put(connector);
 577                         return 0;
 578                 }
 579         } else {
 580                 /*
 581                  * If no encoder has been found the entity must be the
 582                  * connector.
 583                  */
 584                 connector = entity;
 585         }
 586
 587         ret = rcar_du_encoder_init(rcdu, enc_type, output, encoder, connector);
 588         of_node_put(encoder);
 589         of_node_put(connector);
 590
 591         return ret < 0 ? ret : 1;
 592 }
 593
 594 static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 595 {
 596         struct device_node *np = rcdu->dev->of_node;
 597         struct device_node *ep_node;
 598         unsigned int num_encoders = 0;
 599
 600         /*
 601          * Iterate over the endpoints and create one encoder for each output
 602          * pipeline.
 603          */
 604         for_each_endpoint_of_node(np, ep_node) {
 605                 enum rcar_du_output output;
 606                 struct of_endpoint ep;
 607                 unsigned int i;
 608                 int ret;
 609
 610                 ret = of_graph_parse_endpoint(ep_node, &ep);
 611                 if (ret < 0) {
 612                         of_node_put(ep_node);
 613                         return ret;
 614                 }
 615
 616                 /* Find the output route corresponding to the port number. */
 617                 for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
 618                         if (rcdu->info->routes[i].possible_crtcs &&
 619                             rcdu->info->routes[i].port == ep.port) {
 620                                 output = i;
 621                                 break;
 622                         }
 623                 }
 624
 625                 if (i == RCAR_DU_OUTPUT_MAX) {
 626                         dev_warn(rcdu->dev,
 627                                  "port %u references unexisting output, skipping\n",
 628                                  ep.port);
 629                         continue;
 630                 }
 631
 632                 /* Process the output pipeline. */
 633                 ret = rcar_du_encoders_init_one(rcdu, output, &ep);
 634                 if (ret < 0) {
 635                         if (ret == -EPROBE_DEFER) {
 636                                 of_node_put(ep_node);
 637                                 return ret;
 638                         }
 639
 640                         dev_info(rcdu->dev,
 641                                  "encoder initialization failed, skipping\n");
 642                         continue;
 643                 }
 644
 645                 num_encoders += ret;
 646         }
 647
 648         return num_encoders;
 649 }
 650
 651 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 652 {
 653         static const unsigned int mmio_offsets[] = {
 654                 DU0_REG_OFFSET, DU2_REG_OFFSET
 655         };
 656
 657         struct drm_device *dev = rcdu->ddev;
 658         struct drm_encoder *encoder;
 659         struct drm_fbdev_cma *fbdev;
 660         unsigned int num_encoders;
 661         unsigned int num_groups;
 662         unsigned int i;
 663         int ret;
 664
 665         drm_mode_config_init(dev);
 666
 667         dev->mode_config.min_width = 0;
 668         dev->mode_config.min_height = 0;
 669         dev->mode_config.max_width = 4095;
 670         dev->mode_config.max_height = 2047;
 671         dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 672
 673         rcdu->num_crtcs = rcdu->info->num_crtcs;
 674
 675         /* Initialize the groups. */
 676         num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
 677
 678         for (i = 0; i < num_groups; ++i) {
 679                 struct rcar_du_group *rgrp = &rcdu->groups[i];
 680
 681                 mutex_init(&rgrp->lock);
 682
 683                 rgrp->dev = rcdu;
 684                 rgrp->mmio_offset = mmio_offsets[i];
 685                 rgrp->index = i;
 686
 687                 ret = rcar_du_planes_init(rgrp);
 688                 if (ret < 0)
 689                         return ret;
 690         }
 691
 692         /* Create the CRTCs. */
 693         for (i = 0; i < rcdu->num_crtcs; ++i) {
 694                 struct rcar_du_group *rgrp = &rcdu->groups[i / 2];
 695
 696                 ret = rcar_du_crtc_create(rgrp, i);
 697                 if (ret < 0)
 698                         return ret;
 699         }
 700
 701         /* Initialize the encoders. */
 702         ret = rcar_du_lvdsenc_init(rcdu);
 703         if (ret < 0)
 704                 return ret;
 705
 706         ret = rcar_du_encoders_init(rcdu);
 707         if (ret < 0)
 708                 return ret;
 709
 710         if (ret == 0) {
 711                 dev_err(rcdu->dev, "error: no encoder could be initialized\n");
 712                 return -EINVAL;
 713         }
 714
 715         num_encoders = ret;
 716
 717         /* Set the possible CRTCs and possible clones. There's always at least
 718          * one way for all encoders to clone each other, set all bits in the
 719          * possible clones field.
 720          */
 721         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 722                 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 723                 const struct rcar_du_output_routing *route =
 724                         &rcdu->info->routes[renc->output];
 725
 726                 encoder->possible_crtcs = route->possible_crtcs;
 727                 encoder->possible_clones = (1 << num_encoders) - 1;
 728         }
 729
 730         drm_mode_config_reset(dev);
 731
 732         drm_kms_helper_poll_init(dev);
 733
 734         if (dev->mode_config.num_connector) {
 735                 fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
 736                                            dev->mode_config.num_connector);
 737                 if (IS_ERR(fbdev))
 738                         return PTR_ERR(fbdev);
 739
 740                 rcdu->fbdev = fbdev;
 741         } else {
 742                 dev_info(rcdu->dev,
 743                          "no connector found, disabling fbdev emulation\n");
 744         }
 745
 746         return 0;
 747 }