drivers/media/platform/renesas/vsp1/vsp1_wpf.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * vsp1_wpf.c  --  R-Car VSP1 Write Pixel Formatter
   4  *
   5  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   6  *
   7  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8  */
   9
  10 #include <linux/device.h>
  11
  12 #include <media/v4l2-subdev.h>
  13
  14 #include "vsp1.h"
  15 #include "vsp1_dl.h"
  16 #include "vsp1_pipe.h"
  17 #include "vsp1_rwpf.h"
  18 #include "vsp1_video.h"
  19
  20 #define WPF_GEN2_MAX_WIDTH                      2048U
  21 #define WPF_GEN2_MAX_HEIGHT                     2048U
  22 #define WPF_GEN3_MAX_WIDTH                      8190U
  23 #define WPF_GEN3_MAX_HEIGHT                     8190U
  24
  25 /* -----------------------------------------------------------------------------
  26  * Device Access
  27  */
  28
  29 static inline void vsp1_wpf_write(struct vsp1_rwpf *wpf,
  30                                   struct vsp1_dl_body *dlb, u32 reg, u32 data)
  31 {
  32         vsp1_dl_body_write(dlb, reg + wpf->entity.index * VI6_WPF_OFFSET, data);
  33 }
  34
  35 /* -----------------------------------------------------------------------------
  36  * Controls
  37  */
  38
  39 enum wpf_flip_ctrl {
  40         WPF_CTRL_VFLIP = 0,
  41         WPF_CTRL_HFLIP = 1,
  42 };
  43
  44 static int vsp1_wpf_set_rotation(struct vsp1_rwpf *wpf, unsigned int rotation)
  45 {
  46         struct vsp1_video *video = wpf->video;
  47         struct v4l2_mbus_framefmt *sink_format;
  48         struct v4l2_mbus_framefmt *source_format;
  49         bool rotate;
  50         int ret = 0;
  51
  52         /*
  53          * Only consider the 0°/180° from/to 90°/270° modifications, the rest
  54          * is taken care of by the flipping configuration.
  55          */
  56         rotate = rotation == 90 || rotation == 270;
  57         if (rotate == wpf->flip.rotate)
  58                 return 0;
  59
  60         /* Changing rotation isn't allowed when buffers are allocated. */
  61         mutex_lock(&video->lock);
  62
  63         if (vb2_is_busy(&video->queue)) {
  64                 ret = -EBUSY;
  65                 goto done;
  66         }
  67
  68         sink_format = vsp1_entity_get_pad_format(&wpf->entity,
  69                                                  wpf->entity.config,
  70                                                  RWPF_PAD_SINK);
  71         source_format = vsp1_entity_get_pad_format(&wpf->entity,
  72                                                    wpf->entity.config,
  73                                                    RWPF_PAD_SOURCE);
  74
  75         mutex_lock(&wpf->entity.lock);
  76
  77         if (rotate) {
  78                 source_format->width = sink_format->height;
  79                 source_format->height = sink_format->width;
  80         } else {
  81                 source_format->width = sink_format->width;
  82                 source_format->height = sink_format->height;
  83         }
  84
  85         wpf->flip.rotate = rotate;
  86
  87         mutex_unlock(&wpf->entity.lock);
  88
  89 done:
  90         mutex_unlock(&video->lock);
  91         return ret;
  92 }
  93
  94 static int vsp1_wpf_s_ctrl(struct v4l2_ctrl *ctrl)
  95 {
  96         struct vsp1_rwpf *wpf =
  97                 container_of(ctrl->handler, struct vsp1_rwpf, ctrls);
  98         unsigned int rotation;
  99         u32 flip = 0;
 100         int ret;
 101
 102         /* Update the rotation. */
 103         rotation = wpf->flip.ctrls.rotate ? wpf->flip.ctrls.rotate->val : 0;
 104         ret = vsp1_wpf_set_rotation(wpf, rotation);
 105         if (ret < 0)
 106                 return ret;
 107
 108         /*
 109          * Compute the flip value resulting from all three controls, with
 110          * rotation by 180° flipping the image in both directions. Store the
 111          * result in the pending flip field for the next frame that will be
 112          * processed.
 113          */
 114         if (wpf->flip.ctrls.vflip->val)
 115                 flip |= BIT(WPF_CTRL_VFLIP);
 116
 117         if (wpf->flip.ctrls.hflip && wpf->flip.ctrls.hflip->val)
 118                 flip |= BIT(WPF_CTRL_HFLIP);
 119
 120         if (rotation == 180 || rotation == 270)
 121                 flip ^= BIT(WPF_CTRL_VFLIP) | BIT(WPF_CTRL_HFLIP);
 122
 123         spin_lock_irq(&wpf->flip.lock);
 124         wpf->flip.pending = flip;
 125         spin_unlock_irq(&wpf->flip.lock);
 126
 127         return 0;
 128 }
 129
 130 static const struct v4l2_ctrl_ops vsp1_wpf_ctrl_ops = {
 131         .s_ctrl = vsp1_wpf_s_ctrl,
 132 };
 133
 134 static int wpf_init_controls(struct vsp1_rwpf *wpf)
 135 {
 136         struct vsp1_device *vsp1 = wpf->entity.vsp1;
 137         unsigned int num_flip_ctrls;
 138
 139         spin_lock_init(&wpf->flip.lock);
 140
 141         if (wpf->entity.index != 0) {
 142                 /* Only WPF0 supports flipping. */
 143                 num_flip_ctrls = 0;
 144         } else if (vsp1_feature(vsp1, VSP1_HAS_WPF_HFLIP)) {
 145                 /*
 146                  * When horizontal flip is supported the WPF implements three
 147                  * controls (horizontal flip, vertical flip and rotation).
 148                  */
 149                 num_flip_ctrls = 3;
 150         } else if (vsp1_feature(vsp1, VSP1_HAS_WPF_VFLIP)) {
 151                 /*
 152                  * When only vertical flip is supported the WPF implements a
 153                  * single control (vertical flip).
 154                  */
 155                 num_flip_ctrls = 1;
 156         } else {
 157                 /* Otherwise flipping is not supported. */
 158                 num_flip_ctrls = 0;
 159         }
 160
 161         vsp1_rwpf_init_ctrls(wpf, num_flip_ctrls);
 162
 163         if (num_flip_ctrls >= 1) {
 164                 wpf->flip.ctrls.vflip =
 165                         v4l2_ctrl_new_std(&wpf->ctrls, &vsp1_wpf_ctrl_ops,
 166                                           V4L2_CID_VFLIP, 0, 1, 1, 0);
 167         }
 168
 169         if (num_flip_ctrls == 3) {
 170                 wpf->flip.ctrls.hflip =
 171                         v4l2_ctrl_new_std(&wpf->ctrls, &vsp1_wpf_ctrl_ops,
 172                                           V4L2_CID_HFLIP, 0, 1, 1, 0);
 173                 wpf->flip.ctrls.rotate =
 174                         v4l2_ctrl_new_std(&wpf->ctrls, &vsp1_wpf_ctrl_ops,
 175                                           V4L2_CID_ROTATE, 0, 270, 90, 0);
 176                 v4l2_ctrl_cluster(3, &wpf->flip.ctrls.vflip);
 177         }
 178
 179         if (wpf->ctrls.error) {
 180                 dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
 181                         wpf->entity.index);
 182                 return wpf->ctrls.error;
 183         }
 184
 185         return 0;
 186 }
 187
 188 /* -----------------------------------------------------------------------------
 189  * VSP1 Entity Operations
 190  */
 191
 192 void vsp1_wpf_stop(struct vsp1_rwpf *wpf)
 193 {
 194         struct vsp1_device *vsp1 = wpf->entity.vsp1;
 195
 196         /*
 197          * Write to registers directly when stopping the stream as there will be
 198          * no pipeline run to apply the display list.
 199          */
 200         vsp1_write(vsp1, VI6_WPF_IRQ_ENB(wpf->entity.index), 0);
 201         vsp1_write(vsp1, wpf->entity.index * VI6_WPF_OFFSET +
 202                    VI6_WPF_SRCRPF, 0);
 203 }
 204
 205 static void vsp1_wpf_destroy(struct vsp1_entity *entity)
 206 {
 207         struct vsp1_rwpf *wpf = entity_to_rwpf(entity);
 208
 209         vsp1_dlm_destroy(wpf->dlm);
 210 }
 211
 212 static int wpf_configure_writeback_chain(struct vsp1_rwpf *wpf,
 213                                          struct vsp1_dl_list *dl)
 214 {
 215         unsigned int index = wpf->entity.index;
 216         struct vsp1_dl_list *dl_next;
 217         struct vsp1_dl_body *dlb;
 218
 219         dl_next = vsp1_dl_list_get(wpf->dlm);
 220         if (!dl_next) {
 221                 dev_err(wpf->entity.vsp1->dev,
 222                         "Failed to obtain a dl list, disabling writeback\n");
 223                 return -ENOMEM;
 224         }
 225
 226         dlb = vsp1_dl_list_get_body0(dl_next);
 227         vsp1_dl_body_write(dlb, VI6_WPF_WRBCK_CTRL(index), 0);
 228         vsp1_dl_list_add_chain(dl, dl_next);
 229
 230         return 0;
 231 }
 232
 233 static void wpf_configure_stream(struct vsp1_entity *entity,
 234                                  struct vsp1_pipeline *pipe,
 235                                  struct vsp1_dl_list *dl,
 236                                  struct vsp1_dl_body *dlb)
 237 {
 238         struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
 239         struct vsp1_device *vsp1 = wpf->entity.vsp1;
 240         const struct v4l2_mbus_framefmt *source_format;
 241         const struct v4l2_mbus_framefmt *sink_format;
 242         unsigned int index = wpf->entity.index;
 243         unsigned int i;
 244         u32 outfmt = 0;
 245         u32 srcrpf = 0;
 246         int ret;
 247
 248         sink_format = vsp1_entity_get_pad_format(&wpf->entity,
 249                                                  wpf->entity.config,
 250                                                  RWPF_PAD_SINK);
 251         source_format = vsp1_entity_get_pad_format(&wpf->entity,
 252                                                    wpf->entity.config,
 253                                                    RWPF_PAD_SOURCE);
 254
 255         /* Format */
 256         if (!pipe->lif || wpf->writeback) {
 257                 const struct v4l2_pix_format_mplane *format = &wpf->format;
 258                 const struct vsp1_format_info *fmtinfo = wpf->fmtinfo;
 259
 260                 outfmt = fmtinfo->hwfmt << VI6_WPF_OUTFMT_WRFMT_SHIFT;
 261
 262                 if (wpf->flip.rotate)
 263                         outfmt |= VI6_WPF_OUTFMT_ROT;
 264
 265                 if (fmtinfo->alpha)
 266                         outfmt |= VI6_WPF_OUTFMT_PXA;
 267                 if (fmtinfo->swap_yc)
 268                         outfmt |= VI6_WPF_OUTFMT_SPYCS;
 269                 if (fmtinfo->swap_uv)
 270                         outfmt |= VI6_WPF_OUTFMT_SPUVS;
 271
 272                 /* Destination stride and byte swapping. */
 273                 vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_STRIDE_Y,
 274                                format->plane_fmt[0].bytesperline);
 275                 if (format->num_planes > 1)
 276                         vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_STRIDE_C,
 277                                        format->plane_fmt[1].bytesperline);
 278
 279                 vsp1_wpf_write(wpf, dlb, VI6_WPF_DSWAP, fmtinfo->swap);
 280
 281                 if (vsp1_feature(vsp1, VSP1_HAS_WPF_HFLIP) && index == 0)
 282                         vsp1_wpf_write(wpf, dlb, VI6_WPF_ROT_CTRL,
 283                                        VI6_WPF_ROT_CTRL_LN16 |
 284                                        (256 << VI6_WPF_ROT_CTRL_LMEM_WD_SHIFT));
 285         }
 286
 287         if (sink_format->code != source_format->code)
 288                 outfmt |= VI6_WPF_OUTFMT_CSC;
 289
 290         wpf->outfmt = outfmt;
 291
 292         vsp1_dl_body_write(dlb, VI6_DPR_WPF_FPORCH(index),
 293                            VI6_DPR_WPF_FPORCH_FP_WPFN);
 294
 295         /*
 296          * Sources. If the pipeline has a single input and BRx is not used,
 297          * configure it as the master layer. Otherwise configure all
 298          * inputs as sub-layers and select the virtual RPF as the master
 299          * layer.
 300          */
 301         for (i = 0; i < vsp1->info->rpf_count; ++i) {
 302                 struct vsp1_rwpf *input = pipe->inputs[i];
 303
 304                 if (!input)
 305                         continue;
 306
 307                 srcrpf |= (!pipe->brx && pipe->num_inputs == 1)
 308                         ? VI6_WPF_SRCRPF_RPF_ACT_MST(input->entity.index)
 309                         : VI6_WPF_SRCRPF_RPF_ACT_SUB(input->entity.index);
 310         }
 311
 312         if (pipe->brx)
 313                 srcrpf |= pipe->brx->type == VSP1_ENTITY_BRU
 314                         ? VI6_WPF_SRCRPF_VIRACT_MST
 315                         : VI6_WPF_SRCRPF_VIRACT2_MST;
 316
 317         vsp1_wpf_write(wpf, dlb, VI6_WPF_SRCRPF, srcrpf);
 318
 319         /* Enable interrupts. */
 320         vsp1_dl_body_write(dlb, VI6_WPF_IRQ_STA(index), 0);
 321         vsp1_dl_body_write(dlb, VI6_WPF_IRQ_ENB(index),
 322                            VI6_WPF_IRQ_ENB_DFEE);
 323
 324         /*
 325          * Configure writeback for display pipelines (the wpf writeback flag is
 326          * never set for memory-to-memory pipelines). Start by adding a chained
 327          * display list to disable writeback after a single frame, and process
 328          * to enable writeback. If the display list allocation fails don't
 329          * enable writeback as we wouldn't be able to safely disable it,
 330          * resulting in possible memory corruption.
 331          */
 332         if (wpf->writeback) {
 333                 ret = wpf_configure_writeback_chain(wpf, dl);
 334                 if (ret < 0)
 335                         wpf->writeback = false;
 336         }
 337
 338         vsp1_dl_body_write(dlb, VI6_WPF_WRBCK_CTRL(index),
 339                            wpf->writeback ? VI6_WPF_WRBCK_CTRL_WBMD : 0);
 340 }
 341
 342 static void wpf_configure_frame(struct vsp1_entity *entity,
 343                                 struct vsp1_pipeline *pipe,
 344                                 struct vsp1_dl_list *dl,
 345                                 struct vsp1_dl_body *dlb)
 346 {
 347         const unsigned int mask = BIT(WPF_CTRL_VFLIP)
 348                                 | BIT(WPF_CTRL_HFLIP);
 349         struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
 350         unsigned long flags;
 351         u32 outfmt;
 352
 353         spin_lock_irqsave(&wpf->flip.lock, flags);
 354         wpf->flip.active = (wpf->flip.active & ~mask)
 355                          | (wpf->flip.pending & mask);
 356         spin_unlock_irqrestore(&wpf->flip.lock, flags);
 357
 358         outfmt = (wpf->alpha << VI6_WPF_OUTFMT_PDV_SHIFT) | wpf->outfmt;
 359
 360         if (wpf->flip.active & BIT(WPF_CTRL_VFLIP))
 361                 outfmt |= VI6_WPF_OUTFMT_FLP;
 362         if (wpf->flip.active & BIT(WPF_CTRL_HFLIP))
 363                 outfmt |= VI6_WPF_OUTFMT_HFLP;
 364
 365         vsp1_wpf_write(wpf, dlb, VI6_WPF_OUTFMT, outfmt);
 366 }
 367
 368 static void wpf_configure_partition(struct vsp1_entity *entity,
 369                                     struct vsp1_pipeline *pipe,
 370                                     struct vsp1_dl_list *dl,
 371                                     struct vsp1_dl_body *dlb)
 372 {
 373         struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
 374         struct vsp1_device *vsp1 = wpf->entity.vsp1;
 375         struct vsp1_rwpf_memory mem = wpf->mem;
 376         const struct v4l2_mbus_framefmt *sink_format;
 377         const struct v4l2_pix_format_mplane *format = &wpf->format;
 378         const struct vsp1_format_info *fmtinfo = wpf->fmtinfo;
 379         unsigned int width;
 380         unsigned int height;
 381         unsigned int left;
 382         unsigned int offset;
 383         unsigned int flip;
 384         unsigned int i;
 385
 386         sink_format = vsp1_entity_get_pad_format(&wpf->entity,
 387                                                  wpf->entity.config,
 388                                                  RWPF_PAD_SINK);
 389         width = sink_format->width;
 390         height = sink_format->height;
 391         left = 0;
 392
 393         /*
 394          * Cropping. The partition algorithm can split the image into
 395          * multiple slices.
 396          */
 397         if (pipe->partitions > 1) {
 398                 width = pipe->partition->wpf.width;
 399                 left = pipe->partition->wpf.left;
 400         }
 401
 402         vsp1_wpf_write(wpf, dlb, VI6_WPF_HSZCLIP, VI6_WPF_SZCLIP_EN |
 403                        (0 << VI6_WPF_SZCLIP_OFST_SHIFT) |
 404                        (width << VI6_WPF_SZCLIP_SIZE_SHIFT));
 405         vsp1_wpf_write(wpf, dlb, VI6_WPF_VSZCLIP, VI6_WPF_SZCLIP_EN |
 406                        (0 << VI6_WPF_SZCLIP_OFST_SHIFT) |
 407                        (height << VI6_WPF_SZCLIP_SIZE_SHIFT));
 408
 409         /*
 410          * For display pipelines without writeback enabled there's no memory
 411          * address to configure, return now.
 412          */
 413         if (pipe->lif && !wpf->writeback)
 414                 return;
 415
 416         /*
 417          * Update the memory offsets based on flipping configuration.
 418          * The destination addresses point to the locations where the
 419          * VSP starts writing to memory, which can be any corner of the
 420          * image depending on the combination of flipping and rotation.
 421          */
 422
 423         /*
 424          * First take the partition left coordinate into account.
 425          * Compute the offset to order the partitions correctly on the
 426          * output based on whether flipping is enabled. Consider
 427          * horizontal flipping when rotation is disabled but vertical
 428          * flipping when rotation is enabled, as rotating the image
 429          * switches the horizontal and vertical directions. The offset
 430          * is applied horizontally or vertically accordingly.
 431          */
 432         flip = wpf->flip.active;
 433
 434         if (flip & BIT(WPF_CTRL_HFLIP) && !wpf->flip.rotate)
 435                 offset = format->width - left - width;
 436         else if (flip & BIT(WPF_CTRL_VFLIP) && wpf->flip.rotate)
 437                 offset = format->height - left - width;
 438         else
 439                 offset = left;
 440
 441         for (i = 0; i < format->num_planes; ++i) {
 442                 unsigned int hsub = i > 0 ? fmtinfo->hsub : 1;
 443                 unsigned int vsub = i > 0 ? fmtinfo->vsub : 1;
 444
 445                 if (wpf->flip.rotate)
 446                         mem.addr[i] += offset / vsub
 447                                      * format->plane_fmt[i].bytesperline;
 448                 else
 449                         mem.addr[i] += offset / hsub
 450                                      * fmtinfo->bpp[i] / 8;
 451         }
 452
 453         if (flip & BIT(WPF_CTRL_VFLIP)) {
 454                 /*
 455                  * When rotating the output (after rotation) image
 456                  * height is equal to the partition width (before
 457                  * rotation). Otherwise it is equal to the output
 458                  * image height.
 459                  */
 460                 if (wpf->flip.rotate)
 461                         height = width;
 462                 else
 463                         height = format->height;
 464
 465                 mem.addr[0] += (height - 1)
 466                              * format->plane_fmt[0].bytesperline;
 467
 468                 if (format->num_planes > 1) {
 469                         offset = (height / fmtinfo->vsub - 1)
 470                                * format->plane_fmt[1].bytesperline;
 471                         mem.addr[1] += offset;
 472                         mem.addr[2] += offset;
 473                 }
 474         }
 475
 476         if (wpf->flip.rotate && !(flip & BIT(WPF_CTRL_HFLIP))) {
 477                 unsigned int hoffset = max(0, (int)format->width - 16);
 478
 479                 /*
 480                  * Compute the output coordinate. The partition
 481                  * horizontal (left) offset becomes a vertical offset.
 482                  */
 483                 for (i = 0; i < format->num_planes; ++i) {
 484                         unsigned int hsub = i > 0 ? fmtinfo->hsub : 1;
 485
 486                         mem.addr[i] += hoffset / hsub
 487                                      * fmtinfo->bpp[i] / 8;
 488                 }
 489         }
 490
 491         /*
 492          * On Gen3+ hardware the SPUVS bit has no effect on 3-planar
 493          * formats. Swap the U and V planes manually in that case.
 494          */
 495         if (vsp1->info->gen >= 3 && format->num_planes == 3 &&
 496             fmtinfo->swap_uv)
 497                 swap(mem.addr[1], mem.addr[2]);
 498
 499         vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_ADDR_Y, mem.addr[0]);
 500         vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_ADDR_C0, mem.addr[1]);
 501         vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_ADDR_C1, mem.addr[2]);
 502
 503         /*
 504          * Writeback operates in single-shot mode and lasts for a single frame,
 505          * reset the writeback flag to false for the next frame.
 506          */
 507         wpf->writeback = false;
 508 }
 509
 510 static unsigned int wpf_max_width(struct vsp1_entity *entity,
 511                                   struct vsp1_pipeline *pipe)
 512 {
 513         struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
 514
 515         return wpf->flip.rotate ? 256 : wpf->max_width;
 516 }
 517
 518 static void wpf_partition(struct vsp1_entity *entity,
 519                           struct vsp1_pipeline *pipe,
 520                           struct vsp1_partition *partition,
 521                           unsigned int partition_idx,
 522                           struct vsp1_partition_window *window)
 523 {
 524         partition->wpf = *window;
 525 }
 526
 527 static const struct vsp1_entity_operations wpf_entity_ops = {
 528         .destroy = vsp1_wpf_destroy,
 529         .configure_stream = wpf_configure_stream,
 530         .configure_frame = wpf_configure_frame,
 531         .configure_partition = wpf_configure_partition,
 532         .max_width = wpf_max_width,
 533         .partition = wpf_partition,
 534 };
 535
 536 /* -----------------------------------------------------------------------------
 537  * Initialization and Cleanup
 538  */
 539
 540 struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index)
 541 {
 542         struct vsp1_rwpf *wpf;
 543         char name[6];
 544         int ret;
 545
 546         wpf = devm_kzalloc(vsp1->dev, sizeof(*wpf), GFP_KERNEL);
 547         if (wpf == NULL)
 548                 return ERR_PTR(-ENOMEM);
 549
 550         if (vsp1->info->gen == 2) {
 551                 wpf->max_width = WPF_GEN2_MAX_WIDTH;
 552                 wpf->max_height = WPF_GEN2_MAX_HEIGHT;
 553         } else {
 554                 wpf->max_width = WPF_GEN3_MAX_WIDTH;
 555                 wpf->max_height = WPF_GEN3_MAX_HEIGHT;
 556         }
 557
 558         wpf->entity.ops = &wpf_entity_ops;
 559         wpf->entity.type = VSP1_ENTITY_WPF;
 560         wpf->entity.index = index;
 561
 562         sprintf(name, "wpf.%u", index);
 563         ret = vsp1_entity_init(vsp1, &wpf->entity, name, 2, &vsp1_rwpf_subdev_ops,
 564                                MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
 565         if (ret < 0)
 566                 return ERR_PTR(ret);
 567
 568         /* Initialize the display list manager. */
 569         wpf->dlm = vsp1_dlm_create(vsp1, index, 64);
 570         if (!wpf->dlm) {
 571                 ret = -ENOMEM;
 572                 goto error;
 573         }
 574
 575         /* Initialize the control handler. */
 576         ret = wpf_init_controls(wpf);
 577         if (ret < 0) {
 578                 dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
 579                         index);
 580                 goto error;
 581         }
 582
 583         v4l2_ctrl_handler_setup(&wpf->ctrls);
 584
 585         return wpf;
 586
 587 error:
 588         vsp1_entity_destroy(&wpf->entity);
 589         return ERR_PTR(ret);
 590 }