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) 2013-2015 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 #include "rcar_du_vsp.h"
  32
  33 /* -----------------------------------------------------------------------------
  34  * Format helpers
  35  */
  36
  37 static const struct rcar_du_format_info rcar_du_format_infos[] = {
  38         {
  39                 .fourcc = DRM_FORMAT_RGB565,
  40                 .bpp = 16,
  41                 .planes = 1,
  42                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  43                 .edf = PnDDCR4_EDF_NONE,
  44         }, {
  45                 .fourcc = DRM_FORMAT_ARGB1555,
  46                 .bpp = 16,
  47                 .planes = 1,
  48                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  49                 .edf = PnDDCR4_EDF_NONE,
  50         }, {
  51                 .fourcc = DRM_FORMAT_XRGB1555,
  52                 .bpp = 16,
  53                 .planes = 1,
  54                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  55                 .edf = PnDDCR4_EDF_NONE,
  56         }, {
  57                 .fourcc = DRM_FORMAT_XRGB8888,
  58                 .bpp = 32,
  59                 .planes = 1,
  60                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  61                 .edf = PnDDCR4_EDF_RGB888,
  62         }, {
  63                 .fourcc = DRM_FORMAT_ARGB8888,
  64                 .bpp = 32,
  65                 .planes = 1,
  66                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_16BPP,
  67                 .edf = PnDDCR4_EDF_ARGB8888,
  68         }, {
  69                 .fourcc = DRM_FORMAT_UYVY,
  70                 .bpp = 16,
  71                 .planes = 1,
  72                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  73                 .edf = PnDDCR4_EDF_NONE,
  74         }, {
  75                 .fourcc = DRM_FORMAT_YUYV,
  76                 .bpp = 16,
  77                 .planes = 1,
  78                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  79                 .edf = PnDDCR4_EDF_NONE,
  80         }, {
  81                 .fourcc = DRM_FORMAT_NV12,
  82                 .bpp = 12,
  83                 .planes = 2,
  84                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  85                 .edf = PnDDCR4_EDF_NONE,
  86         }, {
  87                 .fourcc = DRM_FORMAT_NV21,
  88                 .bpp = 12,
  89                 .planes = 2,
  90                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  91                 .edf = PnDDCR4_EDF_NONE,
  92         }, {
  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         /* The following formats are not supported on Gen2 and thus have no
 100          * associated .pnmr or .edf settings.
 101          */
 102         {
 103                 .fourcc = DRM_FORMAT_NV61,
 104                 .bpp = 16,
 105                 .planes = 2,
 106         }, {
 107                 .fourcc = DRM_FORMAT_YUV420,
 108                 .bpp = 12,
 109                 .planes = 3,
 110         }, {
 111                 .fourcc = DRM_FORMAT_YVU420,
 112                 .bpp = 12,
 113                 .planes = 3,
 114         }, {
 115                 .fourcc = DRM_FORMAT_YUV422,
 116                 .bpp = 16,
 117                 .planes = 3,
 118         }, {
 119                 .fourcc = DRM_FORMAT_YVU422,
 120                 .bpp = 16,
 121                 .planes = 3,
 122         }, {
 123                 .fourcc = DRM_FORMAT_YUV444,
 124                 .bpp = 24,
 125                 .planes = 3,
 126         }, {
 127                 .fourcc = DRM_FORMAT_YVU444,
 128                 .bpp = 24,
 129                 .planes = 3,
 130         },
 131 };
 132
 133 const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
 134 {
 135         unsigned int i;
 136
 137         for (i = 0; i < ARRAY_SIZE(rcar_du_format_infos); ++i) {
 138                 if (rcar_du_format_infos[i].fourcc == fourcc)
 139                         return &rcar_du_format_infos[i];
 140         }
 141
 142         return NULL;
 143 }
 144
 145 /* -----------------------------------------------------------------------------
 146  * Frame buffer
 147  */
 148
 149 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 150                         struct drm_mode_create_dumb *args)
 151 {
 152         struct rcar_du_device *rcdu = dev->dev_private;
 153         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 154         unsigned int align;
 155
 156         /* The R8A7779 DU requires a 16 pixels pitch alignment as documented,
 157          * but the R8A7790 DU seems to require a 128 bytes pitch alignment.
 158          */
 159         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 160                 align = 128;
 161         else
 162                 align = 16 * args->bpp / 8;
 163
 164         args->pitch = roundup(min_pitch, align);
 165
 166         return drm_gem_cma_dumb_create_internal(file, dev, args);
 167 }
 168
 169 static struct drm_framebuffer *
 170 rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 171                   const struct drm_mode_fb_cmd2 *mode_cmd)
 172 {
 173         struct rcar_du_device *rcdu = dev->dev_private;
 174         const struct rcar_du_format_info *format;
 175         unsigned int max_pitch;
 176         unsigned int align;
 177         unsigned int bpp;
 178         unsigned int i;
 179
 180         format = rcar_du_format_info(mode_cmd->pixel_format);
 181         if (format == NULL) {
 182                 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
 183                         mode_cmd->pixel_format);
 184                 return ERR_PTR(-EINVAL);
 185         }
 186
 187         /*
 188          * The pitch and alignment constraints are expressed in pixels on the
 189          * hardware side and in bytes in the DRM API.
 190          */
 191         bpp = format->planes == 1 ? format->bpp / 8 : 1;
 192         max_pitch =  4096 * bpp;
 193
 194         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 195                 align = 128;
 196         else
 197                 align = 16 * bpp;
 198
 199         if (mode_cmd->pitches[0] & (align - 1) ||
 200             mode_cmd->pitches[0] >= max_pitch) {
 201                 dev_dbg(dev->dev, "invalid pitch value %u\n",
 202                         mode_cmd->pitches[0]);
 203                 return ERR_PTR(-EINVAL);
 204         }
 205
 206         for (i = 1; i < format->planes; ++i) {
 207                 if (mode_cmd->pitches[i] != mode_cmd->pitches[0]) {
 208                         dev_dbg(dev->dev,
 209                                 "luma and chroma pitches do not match\n");
 210                         return ERR_PTR(-EINVAL);
 211                 }
 212         }
 213
 214         return drm_fb_cma_create(dev, file_priv, mode_cmd);
 215 }
 216
 217 static void rcar_du_output_poll_changed(struct drm_device *dev)
 218 {
 219         struct rcar_du_device *rcdu = dev->dev_private;
 220
 221         drm_fbdev_cma_hotplug_event(rcdu->fbdev);
 222 }
 223
 224 /* -----------------------------------------------------------------------------
 225  * Atomic Check and Update
 226  */
 227
 228 static int rcar_du_atomic_check(struct drm_device *dev,
 229                                 struct drm_atomic_state *state)
 230 {
 231         struct rcar_du_device *rcdu = dev->dev_private;
 232         int ret;
 233
 234         ret = drm_atomic_helper_check_modeset(dev, state);
 235         if (ret)
 236                 return ret;
 237
 238         ret = drm_atomic_normalize_zpos(dev, state);
 239         if (ret)
 240                 return ret;
 241
 242         ret = drm_atomic_helper_check_planes(dev, state);
 243         if (ret)
 244                 return ret;
 245
 246         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
 247                 return 0;
 248
 249         return rcar_du_atomic_check_planes(dev, state);
 250 }
 251
 252 struct rcar_du_commit {
 253         struct work_struct work;
 254         struct drm_device *dev;
 255         struct drm_atomic_state *state;
 256         u32 crtcs;
 257 };
 258
 259 static void rcar_du_atomic_complete(struct rcar_du_commit *commit)
 260 {
 261         struct drm_device *dev = commit->dev;
 262         struct rcar_du_device *rcdu = dev->dev_private;
 263         struct drm_atomic_state *old_state = commit->state;
 264
 265         /* Apply the atomic update. */
 266         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 267         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 268         drm_atomic_helper_commit_planes(dev, old_state,
 269                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
 270
 271         drm_atomic_helper_wait_for_vblanks(dev, old_state);
 272
 273         drm_atomic_helper_cleanup_planes(dev, old_state);
 274
 275         drm_atomic_state_put(old_state);
 276
 277         /* Complete the commit, wake up any waiter. */
 278         spin_lock(&rcdu->commit.wait.lock);
 279         rcdu->commit.pending &= ~commit->crtcs;
 280         wake_up_all_locked(&rcdu->commit.wait);
 281         spin_unlock(&rcdu->commit.wait.lock);
 282
 283         kfree(commit);
 284 }
 285
 286 static void rcar_du_atomic_work(struct work_struct *work)
 287 {
 288         struct rcar_du_commit *commit =
 289                 container_of(work, struct rcar_du_commit, work);
 290
 291         rcar_du_atomic_complete(commit);
 292 }
 293
 294 static int rcar_du_atomic_commit(struct drm_device *dev,
 295                                  struct drm_atomic_state *state,
 296                                  bool nonblock)
 297 {
 298         struct rcar_du_device *rcdu = dev->dev_private;
 299         struct rcar_du_commit *commit;
 300         struct drm_crtc *crtc;
 301         struct drm_crtc_state *crtc_state;
 302         unsigned int i;
 303         int ret;
 304
 305         ret = drm_atomic_helper_prepare_planes(dev, state);
 306         if (ret)
 307                 return ret;
 308
 309         /* Allocate the commit object. */
 310         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
 311         if (commit == NULL) {
 312                 ret = -ENOMEM;
 313                 goto error;
 314         }
 315
 316         INIT_WORK(&commit->work, rcar_du_atomic_work);
 317         commit->dev = dev;
 318         commit->state = state;
 319
 320         /* Wait until all affected CRTCs have completed previous commits and
 321          * mark them as pending.
 322          */
 323         for_each_crtc_in_state(state, crtc, crtc_state, i)
 324                 commit->crtcs |= drm_crtc_mask(crtc);
 325
 326         spin_lock(&rcdu->commit.wait.lock);
 327         ret = wait_event_interruptible_locked(rcdu->commit.wait,
 328                         !(rcdu->commit.pending & commit->crtcs));
 329         if (ret == 0)
 330                 rcdu->commit.pending |= commit->crtcs;
 331         spin_unlock(&rcdu->commit.wait.lock);
 332
 333         if (ret) {
 334                 kfree(commit);
 335                 goto error;
 336         }
 337
 338         /* Swap the state, this is the point of no return. */
 339         drm_atomic_helper_swap_state(state, true);
 340
 341         drm_atomic_state_get(state);
 342         if (nonblock)
 343                 schedule_work(&commit->work);
 344         else
 345                 rcar_du_atomic_complete(commit);
 346
 347         return 0;
 348
 349 error:
 350         drm_atomic_helper_cleanup_planes(dev, state);
 351         return ret;
 352 }
 353
 354 /* -----------------------------------------------------------------------------
 355  * Initialization
 356  */
 357
 358 static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
 359         .fb_create = rcar_du_fb_create,
 360         .output_poll_changed = rcar_du_output_poll_changed,
 361         .atomic_check = rcar_du_atomic_check,
 362         .atomic_commit = rcar_du_atomic_commit,
 363 };
 364
 365 static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 366                                      enum rcar_du_output output,
 367                                      struct of_endpoint *ep)
 368 {
 369         static const struct {
 370                 const char *compatible;
 371                 enum rcar_du_encoder_type type;
 372         } encoders[] = {
 373                 { "adi,adv7123", RCAR_DU_ENCODER_VGA },
 374                 { "adi,adv7511w", RCAR_DU_ENCODER_HDMI },
 375                 { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
 376         };
 377
 378         enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
 379         struct device_node *connector = NULL;
 380         struct device_node *encoder = NULL;
 381         struct device_node *ep_node = NULL;
 382         struct device_node *entity_ep_node;
 383         struct device_node *entity;
 384         int ret;
 385
 386         /*
 387          * Locate the connected entity and infer its type from the number of
 388          * endpoints.
 389          */
 390         entity = of_graph_get_remote_port_parent(ep->local_node);
 391         if (!entity) {
 392                 dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n",
 393                         ep->local_node->full_name);
 394                 return -ENODEV;
 395         }
 396
 397         entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);
 398
 399         for_each_endpoint_of_node(entity, ep_node) {
 400                 if (ep_node == entity_ep_node)
 401                         continue;
 402
 403                 /*
 404                  * We've found one endpoint other than the input, this must
 405                  * be an encoder. Locate the connector.
 406                  */
 407                 encoder = entity;
 408                 connector = of_graph_get_remote_port_parent(ep_node);
 409                 of_node_put(ep_node);
 410
 411                 if (!connector) {
 412                         dev_warn(rcdu->dev,
 413                                  "no connector for encoder %s, skipping\n",
 414                                  encoder->full_name);
 415                         of_node_put(entity_ep_node);
 416                         of_node_put(encoder);
 417                         return -ENODEV;
 418                 }
 419
 420                 break;
 421         }
 422
 423         of_node_put(entity_ep_node);
 424
 425         if (encoder) {
 426                 /*
 427                  * If an encoder has been found, get its type based on its
 428                  * compatible string.
 429                  */
 430                 unsigned int i;
 431
 432                 for (i = 0; i < ARRAY_SIZE(encoders); ++i) {
 433                         if (of_device_is_compatible(encoder,
 434                                                     encoders[i].compatible)) {
 435                                 enc_type = encoders[i].type;
 436                                 break;
 437                         }
 438                 }
 439
 440                 if (i == ARRAY_SIZE(encoders)) {
 441                         dev_warn(rcdu->dev,
 442                                  "unknown encoder type for %s, skipping\n",
 443                                  encoder->full_name);
 444                         of_node_put(encoder);
 445                         of_node_put(connector);
 446                         return -EINVAL;
 447                 }
 448         } else {
 449                 /*
 450                  * If no encoder has been found the entity must be the
 451                  * connector.
 452                  */
 453                 connector = entity;
 454         }
 455
 456         ret = rcar_du_encoder_init(rcdu, enc_type, output, encoder, connector);
 457         if (ret && ret != -EPROBE_DEFER)
 458                 dev_warn(rcdu->dev,
 459                          "failed to initialize encoder %s on output %u (%d), skipping\n",
 460                          of_node_full_name(encoder), output, ret);
 461
 462         of_node_put(encoder);
 463         of_node_put(connector);
 464
 465         return ret;
 466 }
 467
 468 static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 469 {
 470         struct device_node *np = rcdu->dev->of_node;
 471         struct device_node *ep_node;
 472         unsigned int num_encoders = 0;
 473
 474         /*
 475          * Iterate over the endpoints and create one encoder for each output
 476          * pipeline.
 477          */
 478         for_each_endpoint_of_node(np, ep_node) {
 479                 enum rcar_du_output output;
 480                 struct of_endpoint ep;
 481                 unsigned int i;
 482                 int ret;
 483
 484                 ret = of_graph_parse_endpoint(ep_node, &ep);
 485                 if (ret < 0) {
 486                         of_node_put(ep_node);
 487                         return ret;
 488                 }
 489
 490                 /* Find the output route corresponding to the port number. */
 491                 for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
 492                         if (rcdu->info->routes[i].possible_crtcs &&
 493                             rcdu->info->routes[i].port == ep.port) {
 494                                 output = i;
 495                                 break;
 496                         }
 497                 }
 498
 499                 if (i == RCAR_DU_OUTPUT_MAX) {
 500                         dev_warn(rcdu->dev,
 501                                  "port %u references unexisting output, skipping\n",
 502                                  ep.port);
 503                         continue;
 504                 }
 505
 506                 /* Process the output pipeline. */
 507                 ret = rcar_du_encoders_init_one(rcdu, output, &ep);
 508                 if (ret < 0) {
 509                         if (ret == -EPROBE_DEFER) {
 510                                 of_node_put(ep_node);
 511                                 return ret;
 512                         }
 513
 514                         continue;
 515                 }
 516
 517                 num_encoders++;
 518         }
 519
 520         return num_encoders;
 521 }
 522
 523 static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 524 {
 525         rcdu->props.alpha =
 526                 drm_property_create_range(rcdu->ddev, 0, "alpha", 0, 255);
 527         if (rcdu->props.alpha == NULL)
 528                 return -ENOMEM;
 529
 530         /* The color key is expressed as an RGB888 triplet stored in a 32-bit
 531          * integer in XRGB8888 format. Bit 24 is used as a flag to disable (0)
 532          * or enable source color keying (1).
 533          */
 534         rcdu->props.colorkey =
 535                 drm_property_create_range(rcdu->ddev, 0, "colorkey",
 536                                           0, 0x01ffffff);
 537         if (rcdu->props.colorkey == NULL)
 538                 return -ENOMEM;
 539
 540         return 0;
 541 }
 542
 543 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 544 {
 545         static const unsigned int mmio_offsets[] = {
 546                 DU0_REG_OFFSET, DU2_REG_OFFSET
 547         };
 548
 549         struct drm_device *dev = rcdu->ddev;
 550         struct drm_encoder *encoder;
 551         struct drm_fbdev_cma *fbdev;
 552         unsigned int num_encoders;
 553         unsigned int num_groups;
 554         unsigned int i;
 555         int ret;
 556
 557         drm_mode_config_init(dev);
 558
 559         dev->mode_config.min_width = 0;
 560         dev->mode_config.min_height = 0;
 561         dev->mode_config.max_width = 4095;
 562         dev->mode_config.max_height = 2047;
 563         dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 564
 565         rcdu->num_crtcs = rcdu->info->num_crtcs;
 566
 567         ret = rcar_du_properties_init(rcdu);
 568         if (ret < 0)
 569                 return ret;
 570
 571         /* Initialize vertical blanking interrupts handling. Start with vblank
 572          * disabled for all CRTCs.
 573          */
 574         ret = drm_vblank_init(dev, (1 << rcdu->info->num_crtcs) - 1);
 575         if (ret < 0)
 576                 return ret;
 577
 578         /* Initialize the groups. */
 579         num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
 580
 581         for (i = 0; i < num_groups; ++i) {
 582                 struct rcar_du_group *rgrp = &rcdu->groups[i];
 583
 584                 mutex_init(&rgrp->lock);
 585
 586                 rgrp->dev = rcdu;
 587                 rgrp->mmio_offset = mmio_offsets[i];
 588                 rgrp->index = i;
 589                 rgrp->num_crtcs = min(rcdu->num_crtcs - 2 * i, 2U);
 590
 591                 /* If we have more than one CRTCs in this group pre-associate
 592                  * the low-order planes with CRTC 0 and the high-order planes
 593                  * with CRTC 1 to minimize flicker occurring when the
 594                  * association is changed.
 595                  */
 596                 rgrp->dptsr_planes = rgrp->num_crtcs > 1
 597                                    ? (rcdu->info->gen >= 3 ? 0x04 : 0xf0)
 598                                    : 0;
 599
 600                 if (!rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
 601                         ret = rcar_du_planes_init(rgrp);
 602                         if (ret < 0)
 603                                 return ret;
 604                 }
 605         }
 606
 607         /* Initialize the compositors. */
 608         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
 609                 for (i = 0; i < rcdu->num_crtcs; ++i) {
 610                         struct rcar_du_vsp *vsp = &rcdu->vsps[i];
 611
 612                         vsp->index = i;
 613                         vsp->dev = rcdu;
 614                         rcdu->crtcs[i].vsp = vsp;
 615
 616                         ret = rcar_du_vsp_init(vsp);
 617                         if (ret < 0)
 618                                 return ret;
 619                 }
 620         }
 621
 622         /* Create the CRTCs. */
 623         for (i = 0; i < rcdu->num_crtcs; ++i) {
 624                 struct rcar_du_group *rgrp = &rcdu->groups[i / 2];
 625
 626                 ret = rcar_du_crtc_create(rgrp, i);
 627                 if (ret < 0)
 628                         return ret;
 629         }
 630
 631         /* Initialize the encoders. */
 632         ret = rcar_du_lvdsenc_init(rcdu);
 633         if (ret < 0)
 634                 return ret;
 635
 636         ret = rcar_du_encoders_init(rcdu);
 637         if (ret < 0)
 638                 return ret;
 639
 640         if (ret == 0) {
 641                 dev_err(rcdu->dev, "error: no encoder could be initialized\n");
 642                 return -EINVAL;
 643         }
 644
 645         num_encoders = ret;
 646
 647         /* Set the possible CRTCs and possible clones. There's always at least
 648          * one way for all encoders to clone each other, set all bits in the
 649          * possible clones field.
 650          */
 651         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 652                 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 653                 const struct rcar_du_output_routing *route =
 654                         &rcdu->info->routes[renc->output];
 655
 656                 encoder->possible_crtcs = route->possible_crtcs;
 657                 encoder->possible_clones = (1 << num_encoders) - 1;
 658         }
 659
 660         drm_mode_config_reset(dev);
 661
 662         drm_kms_helper_poll_init(dev);
 663
 664         if (dev->mode_config.num_connector) {
 665                 fbdev = drm_fbdev_cma_init(dev, 32,
 666                                            dev->mode_config.num_connector);
 667                 if (IS_ERR(fbdev))
 668                         return PTR_ERR(fbdev);
 669
 670                 rcdu->fbdev = fbdev;
 671         } else {
 672                 dev_info(rcdu->dev,
 673                          "no connector found, disabling fbdev emulation\n");
 674         }
 675
 676         return 0;
 677 }