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 ([email protected])
   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(dev, state);
 235         if (ret < 0)
 236                 return ret;
 237
 238         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
 239                 return 0;
 240
 241         return rcar_du_atomic_check_planes(dev, state);
 242 }
 243
 244 struct rcar_du_commit {
 245         struct work_struct work;
 246         struct drm_device *dev;
 247         struct drm_atomic_state *state;
 248         u32 crtcs;
 249 };
 250
 251 static void rcar_du_atomic_complete(struct rcar_du_commit *commit)
 252 {
 253         struct drm_device *dev = commit->dev;
 254         struct rcar_du_device *rcdu = dev->dev_private;
 255         struct drm_atomic_state *old_state = commit->state;
 256
 257         /* Apply the atomic update. */
 258         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 259         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 260         drm_atomic_helper_commit_planes(dev, old_state,
 261                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
 262
 263         drm_atomic_helper_wait_for_vblanks(dev, old_state);
 264
 265         drm_atomic_helper_cleanup_planes(dev, old_state);
 266
 267         drm_atomic_state_free(old_state);
 268
 269         /* Complete the commit, wake up any waiter. */
 270         spin_lock(&rcdu->commit.wait.lock);
 271         rcdu->commit.pending &= ~commit->crtcs;
 272         wake_up_all_locked(&rcdu->commit.wait);
 273         spin_unlock(&rcdu->commit.wait.lock);
 274
 275         kfree(commit);
 276 }
 277
 278 static void rcar_du_atomic_work(struct work_struct *work)
 279 {
 280         struct rcar_du_commit *commit =
 281                 container_of(work, struct rcar_du_commit, work);
 282
 283         rcar_du_atomic_complete(commit);
 284 }
 285
 286 static int rcar_du_atomic_commit(struct drm_device *dev,
 287                                  struct drm_atomic_state *state,
 288                                  bool nonblock)
 289 {
 290         struct rcar_du_device *rcdu = dev->dev_private;
 291         struct rcar_du_commit *commit;
 292         struct drm_crtc *crtc;
 293         struct drm_crtc_state *crtc_state;
 294         unsigned int i;
 295         int ret;
 296
 297         ret = drm_atomic_helper_prepare_planes(dev, state);
 298         if (ret)
 299                 return ret;
 300
 301         /* Allocate the commit object. */
 302         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
 303         if (commit == NULL) {
 304                 ret = -ENOMEM;
 305                 goto error;
 306         }
 307
 308         INIT_WORK(&commit->work, rcar_du_atomic_work);
 309         commit->dev = dev;
 310         commit->state = state;
 311
 312         /* Wait until all affected CRTCs have completed previous commits and
 313          * mark them as pending.
 314          */
 315         for_each_crtc_in_state(state, crtc, crtc_state, i)
 316                 commit->crtcs |= drm_crtc_mask(crtc);
 317
 318         spin_lock(&rcdu->commit.wait.lock);
 319         ret = wait_event_interruptible_locked(rcdu->commit.wait,
 320                         !(rcdu->commit.pending & commit->crtcs));
 321         if (ret == 0)
 322                 rcdu->commit.pending |= commit->crtcs;
 323         spin_unlock(&rcdu->commit.wait.lock);
 324
 325         if (ret) {
 326                 kfree(commit);
 327                 goto error;
 328         }
 329
 330         /* Swap the state, this is the point of no return. */
 331         drm_atomic_helper_swap_state(state, true);
 332
 333         if (nonblock)
 334                 schedule_work(&commit->work);
 335         else
 336                 rcar_du_atomic_complete(commit);
 337
 338         return 0;
 339
 340 error:
 341         drm_atomic_helper_cleanup_planes(dev, state);
 342         return ret;
 343 }
 344
 345 /* -----------------------------------------------------------------------------
 346  * Initialization
 347  */
 348
 349 static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
 350         .fb_create = rcar_du_fb_create,
 351         .output_poll_changed = rcar_du_output_poll_changed,
 352         .atomic_check = rcar_du_atomic_check,
 353         .atomic_commit = rcar_du_atomic_commit,
 354 };
 355
 356 static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 357                                      enum rcar_du_output output,
 358                                      struct of_endpoint *ep)
 359 {
 360         static const struct {
 361                 const char *compatible;
 362                 enum rcar_du_encoder_type type;
 363         } encoders[] = {
 364                 { "adi,adv7123", RCAR_DU_ENCODER_VGA },
 365                 { "adi,adv7511w", RCAR_DU_ENCODER_HDMI },
 366                 { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
 367         };
 368
 369         enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
 370         struct device_node *connector = NULL;
 371         struct device_node *encoder = NULL;
 372         struct device_node *ep_node = NULL;
 373         struct device_node *entity_ep_node;
 374         struct device_node *entity;
 375         int ret;
 376
 377         /*
 378          * Locate the connected entity and infer its type from the number of
 379          * endpoints.
 380          */
 381         entity = of_graph_get_remote_port_parent(ep->local_node);
 382         if (!entity) {
 383                 dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n",
 384                         ep->local_node->full_name);
 385                 return -ENODEV;
 386         }
 387
 388         entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);
 389
 390         for_each_endpoint_of_node(entity, ep_node) {
 391                 if (ep_node == entity_ep_node)
 392                         continue;
 393
 394                 /*
 395                  * We've found one endpoint other than the input, this must
 396                  * be an encoder. Locate the connector.
 397                  */
 398                 encoder = entity;
 399                 connector = of_graph_get_remote_port_parent(ep_node);
 400                 of_node_put(ep_node);
 401
 402                 if (!connector) {
 403                         dev_warn(rcdu->dev,
 404                                  "no connector for encoder %s, skipping\n",
 405                                  encoder->full_name);
 406                         of_node_put(entity_ep_node);
 407                         of_node_put(encoder);
 408                         return -ENODEV;
 409                 }
 410
 411                 break;
 412         }
 413
 414         of_node_put(entity_ep_node);
 415
 416         if (encoder) {
 417                 /*
 418                  * If an encoder has been found, get its type based on its
 419                  * compatible string.
 420                  */
 421                 unsigned int i;
 422
 423                 for (i = 0; i < ARRAY_SIZE(encoders); ++i) {
 424                         if (of_device_is_compatible(encoder,
 425                                                     encoders[i].compatible)) {
 426                                 enc_type = encoders[i].type;
 427                                 break;
 428                         }
 429                 }
 430
 431                 if (i == ARRAY_SIZE(encoders)) {
 432                         dev_warn(rcdu->dev,
 433                                  "unknown encoder type for %s, skipping\n",
 434                                  encoder->full_name);
 435                         of_node_put(encoder);
 436                         of_node_put(connector);
 437                         return -EINVAL;
 438                 }
 439         } else {
 440                 /*
 441                  * If no encoder has been found the entity must be the
 442                  * connector.
 443                  */
 444                 connector = entity;
 445         }
 446
 447         ret = rcar_du_encoder_init(rcdu, enc_type, output, encoder, connector);
 448         of_node_put(encoder);
 449         of_node_put(connector);
 450
 451         if (ret && ret != -EPROBE_DEFER)
 452                 dev_warn(rcdu->dev,
 453                          "failed to initialize encoder %s (%d), skipping\n",
 454                          encoder->full_name, ret);
 455
 456         return ret;
 457 }
 458
 459 static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 460 {
 461         struct device_node *np = rcdu->dev->of_node;
 462         struct device_node *ep_node;
 463         unsigned int num_encoders = 0;
 464
 465         /*
 466          * Iterate over the endpoints and create one encoder for each output
 467          * pipeline.
 468          */
 469         for_each_endpoint_of_node(np, ep_node) {
 470                 enum rcar_du_output output;
 471                 struct of_endpoint ep;
 472                 unsigned int i;
 473                 int ret;
 474
 475                 ret = of_graph_parse_endpoint(ep_node, &ep);
 476                 if (ret < 0) {
 477                         of_node_put(ep_node);
 478                         return ret;
 479                 }
 480
 481                 /* Find the output route corresponding to the port number. */
 482                 for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
 483                         if (rcdu->info->routes[i].possible_crtcs &&
 484                             rcdu->info->routes[i].port == ep.port) {
 485                                 output = i;
 486                                 break;
 487                         }
 488                 }
 489
 490                 if (i == RCAR_DU_OUTPUT_MAX) {
 491                         dev_warn(rcdu->dev,
 492                                  "port %u references unexisting output, skipping\n",
 493                                  ep.port);
 494                         continue;
 495                 }
 496
 497                 /* Process the output pipeline. */
 498                 ret = rcar_du_encoders_init_one(rcdu, output, &ep);
 499                 if (ret < 0) {
 500                         if (ret == -EPROBE_DEFER) {
 501                                 of_node_put(ep_node);
 502                                 return ret;
 503                         }
 504
 505                         continue;
 506                 }
 507
 508                 num_encoders++;
 509         }
 510
 511         return num_encoders;
 512 }
 513
 514 static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 515 {
 516         rcdu->props.alpha =
 517                 drm_property_create_range(rcdu->ddev, 0, "alpha", 0, 255);
 518         if (rcdu->props.alpha == NULL)
 519                 return -ENOMEM;
 520
 521         /* The color key is expressed as an RGB888 triplet stored in a 32-bit
 522          * integer in XRGB8888 format. Bit 24 is used as a flag to disable (0)
 523          * or enable source color keying (1).
 524          */
 525         rcdu->props.colorkey =
 526                 drm_property_create_range(rcdu->ddev, 0, "colorkey",
 527                                           0, 0x01ffffff);
 528         if (rcdu->props.colorkey == NULL)
 529                 return -ENOMEM;
 530
 531         return 0;
 532 }
 533
 534 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 535 {
 536         static const unsigned int mmio_offsets[] = {
 537                 DU0_REG_OFFSET, DU2_REG_OFFSET
 538         };
 539
 540         struct drm_device *dev = rcdu->ddev;
 541         struct drm_encoder *encoder;
 542         struct drm_fbdev_cma *fbdev;
 543         unsigned int num_encoders;
 544         unsigned int num_groups;
 545         unsigned int i;
 546         int ret;
 547
 548         drm_mode_config_init(dev);
 549
 550         dev->mode_config.min_width = 0;
 551         dev->mode_config.min_height = 0;
 552         dev->mode_config.max_width = 4095;
 553         dev->mode_config.max_height = 2047;
 554         dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 555
 556         rcdu->num_crtcs = rcdu->info->num_crtcs;
 557
 558         ret = rcar_du_properties_init(rcdu);
 559         if (ret < 0)
 560                 return ret;
 561
 562         /* Initialize the groups. */
 563         num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
 564
 565         for (i = 0; i < num_groups; ++i) {
 566                 struct rcar_du_group *rgrp = &rcdu->groups[i];
 567
 568                 mutex_init(&rgrp->lock);
 569
 570                 rgrp->dev = rcdu;
 571                 rgrp->mmio_offset = mmio_offsets[i];
 572                 rgrp->index = i;
 573                 rgrp->num_crtcs = min(rcdu->num_crtcs - 2 * i, 2U);
 574
 575                 /* If we have more than one CRTCs in this group pre-associate
 576                  * the low-order planes with CRTC 0 and the high-order planes
 577                  * with CRTC 1 to minimize flicker occurring when the
 578                  * association is changed.
 579                  */
 580                 rgrp->dptsr_planes = rgrp->num_crtcs > 1
 581                                    ? (rcdu->info->gen >= 3 ? 0x04 : 0xf0)
 582                                    : 0;
 583
 584                 if (!rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
 585                         ret = rcar_du_planes_init(rgrp);
 586                         if (ret < 0)
 587                                 return ret;
 588                 }
 589         }
 590
 591         /* Initialize the compositors. */
 592         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
 593                 for (i = 0; i < rcdu->num_crtcs; ++i) {
 594                         struct rcar_du_vsp *vsp = &rcdu->vsps[i];
 595
 596                         vsp->index = i;
 597                         vsp->dev = rcdu;
 598                         rcdu->crtcs[i].vsp = vsp;
 599
 600                         ret = rcar_du_vsp_init(vsp);
 601                         if (ret < 0)
 602                                 return ret;
 603                 }
 604         }
 605
 606         /* Create the CRTCs. */
 607         for (i = 0; i < rcdu->num_crtcs; ++i) {
 608                 struct rcar_du_group *rgrp = &rcdu->groups[i / 2];
 609
 610                 ret = rcar_du_crtc_create(rgrp, i);
 611                 if (ret < 0)
 612                         return ret;
 613         }
 614
 615         /* Initialize the encoders. */
 616         ret = rcar_du_lvdsenc_init(rcdu);
 617         if (ret < 0)
 618                 return ret;
 619
 620         ret = rcar_du_encoders_init(rcdu);
 621         if (ret < 0)
 622                 return ret;
 623
 624         if (ret == 0) {
 625                 dev_err(rcdu->dev, "error: no encoder could be initialized\n");
 626                 return -EINVAL;
 627         }
 628
 629         num_encoders = ret;
 630
 631         /* Set the possible CRTCs and possible clones. There's always at least
 632          * one way for all encoders to clone each other, set all bits in the
 633          * possible clones field.
 634          */
 635         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 636                 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 637                 const struct rcar_du_output_routing *route =
 638                         &rcdu->info->routes[renc->output];
 639
 640                 encoder->possible_crtcs = route->possible_crtcs;
 641                 encoder->possible_clones = (1 << num_encoders) - 1;
 642         }
 643
 644         drm_mode_config_reset(dev);
 645
 646         drm_kms_helper_poll_init(dev);
 647
 648         if (dev->mode_config.num_connector) {
 649                 fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
 650                                            dev->mode_config.num_connector);
 651                 if (IS_ERR(fbdev))
 652                         return PTR_ERR(fbdev);
 653
 654                 rcdu->fbdev = fbdev;
 655         } else {
 656                 dev_info(rcdu->dev,
 657                          "no connector found, disabling fbdev emulation\n");
 658         }
 659
 660         return 0;
 661 }