drivers/media/platform/vsp1/vsp1_video.c

   1 /*
   2  * vsp1_video.c  --  R-Car VSP1 Video Node
   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 <linux/list.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/slab.h>
  18 #include <linux/v4l2-mediabus.h>
  19 #include <linux/videodev2.h>
  20 #include <linux/wait.h>
  21
  22 #include <media/media-entity.h>
  23 #include <media/v4l2-dev.h>
  24 #include <media/v4l2-fh.h>
  25 #include <media/v4l2-ioctl.h>
  26 #include <media/v4l2-subdev.h>
  27 #include <media/videobuf2-v4l2.h>
  28 #include <media/videobuf2-dma-contig.h>
  29
  30 #include "vsp1.h"
  31 #include "vsp1_bru.h"
  32 #include "vsp1_dl.h"
  33 #include "vsp1_entity.h"
  34 #include "vsp1_hgo.h"
  35 #include "vsp1_pipe.h"
  36 #include "vsp1_rwpf.h"
  37 #include "vsp1_uds.h"
  38 #include "vsp1_video.h"
  39
  40 #define VSP1_VIDEO_DEF_FORMAT           V4L2_PIX_FMT_YUYV
  41 #define VSP1_VIDEO_DEF_WIDTH            1024
  42 #define VSP1_VIDEO_DEF_HEIGHT           768
  43
  44 #define VSP1_VIDEO_MIN_WIDTH            2U
  45 #define VSP1_VIDEO_MAX_WIDTH            8190U
  46 #define VSP1_VIDEO_MIN_HEIGHT           2U
  47 #define VSP1_VIDEO_MAX_HEIGHT           8190U
  48
  49 /* -----------------------------------------------------------------------------
  50  * Helper functions
  51  */
  52
  53 static struct v4l2_subdev *
  54 vsp1_video_remote_subdev(struct media_pad *local, u32 *pad)
  55 {
  56         struct media_pad *remote;
  57
  58         remote = media_entity_remote_pad(local);
  59         if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
  60                 return NULL;
  61
  62         if (pad)
  63                 *pad = remote->index;
  64
  65         return media_entity_to_v4l2_subdev(remote->entity);
  66 }
  67
  68 static int vsp1_video_verify_format(struct vsp1_video *video)
  69 {
  70         struct v4l2_subdev_format fmt;
  71         struct v4l2_subdev *subdev;
  72         int ret;
  73
  74         subdev = vsp1_video_remote_subdev(&video->pad, &fmt.pad);
  75         if (subdev == NULL)
  76                 return -EINVAL;
  77
  78         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
  79         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
  80         if (ret < 0)
  81                 return ret == -ENOIOCTLCMD ? -EINVAL : ret;
  82
  83         if (video->rwpf->fmtinfo->mbus != fmt.format.code ||
  84             video->rwpf->format.height != fmt.format.height ||
  85             video->rwpf->format.width != fmt.format.width)
  86                 return -EINVAL;
  87
  88         return 0;
  89 }
  90
  91 static int __vsp1_video_try_format(struct vsp1_video *video,
  92                                    struct v4l2_pix_format_mplane *pix,
  93                                    const struct vsp1_format_info **fmtinfo)
  94 {
  95         static const u32 xrgb_formats[][2] = {
  96                 { V4L2_PIX_FMT_RGB444, V4L2_PIX_FMT_XRGB444 },
  97                 { V4L2_PIX_FMT_RGB555, V4L2_PIX_FMT_XRGB555 },
  98                 { V4L2_PIX_FMT_BGR32, V4L2_PIX_FMT_XBGR32 },
  99                 { V4L2_PIX_FMT_RGB32, V4L2_PIX_FMT_XRGB32 },
 100         };
 101
 102         const struct vsp1_format_info *info;
 103         unsigned int width = pix->width;
 104         unsigned int height = pix->height;
 105         unsigned int i;
 106
 107         /*
 108          * Backward compatibility: replace deprecated RGB formats by their XRGB
 109          * equivalent. This selects the format older userspace applications want
 110          * while still exposing the new format.
 111          */
 112         for (i = 0; i < ARRAY_SIZE(xrgb_formats); ++i) {
 113                 if (xrgb_formats[i][0] == pix->pixelformat) {
 114                         pix->pixelformat = xrgb_formats[i][1];
 115                         break;
 116                 }
 117         }
 118
 119         /*
 120          * Retrieve format information and select the default format if the
 121          * requested format isn't supported.
 122          */
 123         info = vsp1_get_format_info(video->vsp1, pix->pixelformat);
 124         if (info == NULL)
 125                 info = vsp1_get_format_info(video->vsp1, VSP1_VIDEO_DEF_FORMAT);
 126
 127         pix->pixelformat = info->fourcc;
 128         pix->colorspace = V4L2_COLORSPACE_SRGB;
 129         pix->field = V4L2_FIELD_NONE;
 130
 131         if (info->fourcc == V4L2_PIX_FMT_HSV24 ||
 132             info->fourcc == V4L2_PIX_FMT_HSV32)
 133                 pix->hsv_enc = V4L2_HSV_ENC_256;
 134
 135         memset(pix->reserved, 0, sizeof(pix->reserved));
 136
 137         /* Align the width and height for YUV 4:2:2 and 4:2:0 formats. */
 138         width = round_down(width, info->hsub);
 139         height = round_down(height, info->vsub);
 140
 141         /* Clamp the width and height. */
 142         pix->width = clamp(width, VSP1_VIDEO_MIN_WIDTH, VSP1_VIDEO_MAX_WIDTH);
 143         pix->height = clamp(height, VSP1_VIDEO_MIN_HEIGHT,
 144                             VSP1_VIDEO_MAX_HEIGHT);
 145
 146         /*
 147          * Compute and clamp the stride and image size. While not documented in
 148          * the datasheet, strides not aligned to a multiple of 128 bytes result
 149          * in image corruption.
 150          */
 151         for (i = 0; i < min(info->planes, 2U); ++i) {
 152                 unsigned int hsub = i > 0 ? info->hsub : 1;
 153                 unsigned int vsub = i > 0 ? info->vsub : 1;
 154                 unsigned int align = 128;
 155                 unsigned int bpl;
 156
 157                 bpl = clamp_t(unsigned int, pix->plane_fmt[i].bytesperline,
 158                               pix->width / hsub * info->bpp[i] / 8,
 159                               round_down(65535U, align));
 160
 161                 pix->plane_fmt[i].bytesperline = round_up(bpl, align);
 162                 pix->plane_fmt[i].sizeimage = pix->plane_fmt[i].bytesperline
 163                                             * pix->height / vsub;
 164         }
 165
 166         if (info->planes == 3) {
 167                 /* The second and third planes must have the same stride. */
 168                 pix->plane_fmt[2].bytesperline = pix->plane_fmt[1].bytesperline;
 169                 pix->plane_fmt[2].sizeimage = pix->plane_fmt[1].sizeimage;
 170         }
 171
 172         pix->num_planes = info->planes;
 173
 174         if (fmtinfo)
 175                 *fmtinfo = info;
 176
 177         return 0;
 178 }
 179
 180 /* -----------------------------------------------------------------------------
 181  * VSP1 Partition Algorithm support
 182  */
 183
 184 static void vsp1_video_pipeline_setup_partitions(struct vsp1_pipeline *pipe)
 185 {
 186         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 187         const struct v4l2_mbus_framefmt *format;
 188         struct vsp1_entity *entity;
 189         unsigned int div_size;
 190
 191         /*
 192          * Partitions are computed on the size before rotation, use the format
 193          * at the WPF sink.
 194          */
 195         format = vsp1_entity_get_pad_format(&pipe->output->entity,
 196                                             pipe->output->entity.config,
 197                                             RWPF_PAD_SINK);
 198         div_size = format->width;
 199
 200         /* Gen2 hardware doesn't require image partitioning. */
 201         if (vsp1->info->gen == 2) {
 202                 pipe->div_size = div_size;
 203                 pipe->partitions = 1;
 204                 return;
 205         }
 206
 207         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 208                 unsigned int entity_max = VSP1_VIDEO_MAX_WIDTH;
 209
 210                 if (entity->ops->max_width) {
 211                         entity_max = entity->ops->max_width(entity, pipe);
 212                         if (entity_max)
 213                                 div_size = min(div_size, entity_max);
 214                 }
 215         }
 216
 217         pipe->div_size = div_size;
 218         pipe->partitions = DIV_ROUND_UP(format->width, div_size);
 219 }
 220
 221 /**
 222  * vsp1_video_partition - Calculate the active partition output window
 223  *
 224  * @div_size: pre-determined maximum partition division size
 225  * @index: partition index
 226  *
 227  * Returns a v4l2_rect describing the partition window.
 228  */
 229 static struct v4l2_rect vsp1_video_partition(struct vsp1_pipeline *pipe,
 230                                              unsigned int div_size,
 231                                              unsigned int index)
 232 {
 233         const struct v4l2_mbus_framefmt *format;
 234         struct v4l2_rect partition;
 235         unsigned int modulus;
 236
 237         /*
 238          * Partitions are computed on the size before rotation, use the format
 239          * at the WPF sink.
 240          */
 241         format = vsp1_entity_get_pad_format(&pipe->output->entity,
 242                                             pipe->output->entity.config,
 243                                             RWPF_PAD_SINK);
 244
 245         /* A single partition simply processes the output size in full. */
 246         if (pipe->partitions <= 1) {
 247                 partition.left = 0;
 248                 partition.top = 0;
 249                 partition.width = format->width;
 250                 partition.height = format->height;
 251                 return partition;
 252         }
 253
 254         /* Initialise the partition with sane starting conditions. */
 255         partition.left = index * div_size;
 256         partition.top = 0;
 257         partition.width = div_size;
 258         partition.height = format->height;
 259
 260         modulus = format->width % div_size;
 261
 262         /*
 263          * We need to prevent the last partition from being smaller than the
 264          * *minimum* width of the hardware capabilities.
 265          *
 266          * If the modulus is less than half of the partition size,
 267          * the penultimate partition is reduced to half, which is added
 268          * to the final partition: |1234|1234|1234|12|341|
 269          * to prevents this:       |1234|1234|1234|1234|1|.
 270          */
 271         if (modulus) {
 272                 /*
 273                  * pipe->partitions is 1 based, whilst index is a 0 based index.
 274                  * Normalise this locally.
 275                  */
 276                 unsigned int partitions = pipe->partitions - 1;
 277
 278                 if (modulus < div_size / 2) {
 279                         if (index == partitions - 1) {
 280                                 /* Halve the penultimate partition. */
 281                                 partition.width = div_size / 2;
 282                         } else if (index == partitions) {
 283                                 /* Increase the final partition. */
 284                                 partition.width = (div_size / 2) + modulus;
 285                                 partition.left -= div_size / 2;
 286                         }
 287                 } else if (index == partitions) {
 288                         partition.width = modulus;
 289                 }
 290         }
 291
 292         return partition;
 293 }
 294
 295 /* -----------------------------------------------------------------------------
 296  * Pipeline Management
 297  */
 298
 299 /*
 300  * vsp1_video_complete_buffer - Complete the current buffer
 301  * @video: the video node
 302  *
 303  * This function completes the current buffer by filling its sequence number,
 304  * time stamp and payload size, and hands it back to the videobuf core.
 305  *
 306  * When operating in DU output mode (deep pipeline to the DU through the LIF),
 307  * the VSP1 needs to constantly supply frames to the display. In that case, if
 308  * no other buffer is queued, reuse the one that has just been processed instead
 309  * of handing it back to the videobuf core.
 310  *
 311  * Return the next queued buffer or NULL if the queue is empty.
 312  */
 313 static struct vsp1_vb2_buffer *
 314 vsp1_video_complete_buffer(struct vsp1_video *video)
 315 {
 316         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 317         struct vsp1_vb2_buffer *next = NULL;
 318         struct vsp1_vb2_buffer *done;
 319         unsigned long flags;
 320         unsigned int i;
 321
 322         spin_lock_irqsave(&video->irqlock, flags);
 323
 324         if (list_empty(&video->irqqueue)) {
 325                 spin_unlock_irqrestore(&video->irqlock, flags);
 326                 return NULL;
 327         }
 328
 329         done = list_first_entry(&video->irqqueue,
 330                                 struct vsp1_vb2_buffer, queue);
 331
 332         /* In DU output mode reuse the buffer if the list is singular. */
 333         if (pipe->lif && list_is_singular(&video->irqqueue)) {
 334                 spin_unlock_irqrestore(&video->irqlock, flags);
 335                 return done;
 336         }
 337
 338         list_del(&done->queue);
 339
 340         if (!list_empty(&video->irqqueue))
 341                 next = list_first_entry(&video->irqqueue,
 342                                         struct vsp1_vb2_buffer, queue);
 343
 344         spin_unlock_irqrestore(&video->irqlock, flags);
 345
 346         done->buf.sequence = pipe->sequence;
 347         done->buf.vb2_buf.timestamp = ktime_get_ns();
 348         for (i = 0; i < done->buf.vb2_buf.num_planes; ++i)
 349                 vb2_set_plane_payload(&done->buf.vb2_buf, i,
 350                                       vb2_plane_size(&done->buf.vb2_buf, i));
 351         vb2_buffer_done(&done->buf.vb2_buf, VB2_BUF_STATE_DONE);
 352
 353         return next;
 354 }
 355
 356 static void vsp1_video_frame_end(struct vsp1_pipeline *pipe,
 357                                  struct vsp1_rwpf *rwpf)
 358 {
 359         struct vsp1_video *video = rwpf->video;
 360         struct vsp1_vb2_buffer *buf;
 361
 362         buf = vsp1_video_complete_buffer(video);
 363         if (buf == NULL)
 364                 return;
 365
 366         video->rwpf->mem = buf->mem;
 367         pipe->buffers_ready |= 1 << video->pipe_index;
 368 }
 369
 370 static void vsp1_video_pipeline_run_partition(struct vsp1_pipeline *pipe,
 371                                               struct vsp1_dl_list *dl)
 372 {
 373         struct vsp1_entity *entity;
 374
 375         pipe->partition = vsp1_video_partition(pipe, pipe->div_size,
 376                                                pipe->current_partition);
 377
 378         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 379                 if (entity->ops->configure)
 380                         entity->ops->configure(entity, pipe, dl,
 381                                                VSP1_ENTITY_PARAMS_PARTITION);
 382         }
 383 }
 384
 385 static void vsp1_video_pipeline_run(struct vsp1_pipeline *pipe)
 386 {
 387         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 388         struct vsp1_entity *entity;
 389
 390         if (!pipe->dl)
 391                 pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
 392
 393         /*
 394          * Start with the runtime parameters as the configure operation can
 395          * compute/cache information needed when configuring partitions. This
 396          * is the case with flipping in the WPF.
 397          */
 398         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 399                 if (entity->ops->configure)
 400                         entity->ops->configure(entity, pipe, pipe->dl,
 401                                                VSP1_ENTITY_PARAMS_RUNTIME);
 402         }
 403
 404         /* Run the first partition */
 405         pipe->current_partition = 0;
 406         vsp1_video_pipeline_run_partition(pipe, pipe->dl);
 407
 408         /* Process consecutive partitions as necessary */
 409         for (pipe->current_partition = 1;
 410              pipe->current_partition < pipe->partitions;
 411              pipe->current_partition++) {
 412                 struct vsp1_dl_list *dl;
 413
 414                 /*
 415                  * Partition configuration operations will utilise
 416                  * the pipe->current_partition variable to determine
 417                  * the work they should complete.
 418                  */
 419                 dl = vsp1_dl_list_get(pipe->output->dlm);
 420
 421                 /*
 422                  * An incomplete chain will still function, but output only
 423                  * the partitions that had a dl available. The frame end
 424                  * interrupt will be marked on the last dl in the chain.
 425                  */
 426                 if (!dl) {
 427                         dev_err(vsp1->dev, "Failed to obtain a dl list. Frame will be incomplete\n");
 428                         break;
 429                 }
 430
 431                 vsp1_video_pipeline_run_partition(pipe, dl);
 432                 vsp1_dl_list_add_chain(pipe->dl, dl);
 433         }
 434
 435         /* Complete, and commit the head display list. */
 436         vsp1_dl_list_commit(pipe->dl);
 437         pipe->dl = NULL;
 438
 439         vsp1_pipeline_run(pipe);
 440 }
 441
 442 static void vsp1_video_pipeline_frame_end(struct vsp1_pipeline *pipe)
 443 {
 444         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 445         enum vsp1_pipeline_state state;
 446         unsigned long flags;
 447         unsigned int i;
 448
 449         spin_lock_irqsave(&pipe->irqlock, flags);
 450
 451         /* Complete buffers on all video nodes. */
 452         for (i = 0; i < vsp1->info->rpf_count; ++i) {
 453                 if (!pipe->inputs[i])
 454                         continue;
 455
 456                 vsp1_video_frame_end(pipe, pipe->inputs[i]);
 457         }
 458
 459         vsp1_video_frame_end(pipe, pipe->output);
 460
 461         state = pipe->state;
 462         pipe->state = VSP1_PIPELINE_STOPPED;
 463
 464         /*
 465          * If a stop has been requested, mark the pipeline as stopped and
 466          * return. Otherwise restart the pipeline if ready.
 467          */
 468         if (state == VSP1_PIPELINE_STOPPING)
 469                 wake_up(&pipe->wq);
 470         else if (vsp1_pipeline_ready(pipe))
 471                 vsp1_video_pipeline_run(pipe);
 472
 473         spin_unlock_irqrestore(&pipe->irqlock, flags);
 474 }
 475
 476 static int vsp1_video_pipeline_build_branch(struct vsp1_pipeline *pipe,
 477                                             struct vsp1_rwpf *input,
 478                                             struct vsp1_rwpf *output)
 479 {
 480         struct media_entity_enum ent_enum;
 481         struct vsp1_entity *entity;
 482         struct media_pad *pad;
 483         bool bru_found = false;
 484         int ret;
 485
 486         ret = media_entity_enum_init(&ent_enum, &input->entity.vsp1->media_dev);
 487         if (ret < 0)
 488                 return ret;
 489
 490         /*
 491          * The main data path doesn't include the HGO or HGT, use
 492          * vsp1_entity_remote_pad() to traverse the graph.
 493          */
 494
 495         pad = vsp1_entity_remote_pad(&input->entity.pads[RWPF_PAD_SOURCE]);
 496
 497         while (1) {
 498                 if (pad == NULL) {
 499                         ret = -EPIPE;
 500                         goto out;
 501                 }
 502
 503                 /* We've reached a video node, that shouldn't have happened. */
 504                 if (!is_media_entity_v4l2_subdev(pad->entity)) {
 505                         ret = -EPIPE;
 506                         goto out;
 507                 }
 508
 509                 entity = to_vsp1_entity(
 510                         media_entity_to_v4l2_subdev(pad->entity));
 511
 512                 /*
 513                  * A BRU is present in the pipeline, store the BRU input pad
 514                  * number in the input RPF for use when configuring the RPF.
 515                  */
 516                 if (entity->type == VSP1_ENTITY_BRU) {
 517                         struct vsp1_bru *bru = to_bru(&entity->subdev);
 518
 519                         bru->inputs[pad->index].rpf = input;
 520                         input->bru_input = pad->index;
 521
 522                         bru_found = true;
 523                 }
 524
 525                 /* We've reached the WPF, we're done. */
 526                 if (entity->type == VSP1_ENTITY_WPF)
 527                         break;
 528
 529                 /* Ensure the branch has no loop. */
 530                 if (media_entity_enum_test_and_set(&ent_enum,
 531                                                    &entity->subdev.entity)) {
 532                         ret = -EPIPE;
 533                         goto out;
 534                 }
 535
 536                 /* UDS can't be chained. */
 537                 if (entity->type == VSP1_ENTITY_UDS) {
 538                         if (pipe->uds) {
 539                                 ret = -EPIPE;
 540                                 goto out;
 541                         }
 542
 543                         pipe->uds = entity;
 544                         pipe->uds_input = bru_found ? pipe->bru
 545                                         : &input->entity;
 546                 }
 547
 548                 /* Follow the source link, ignoring any HGO or HGT. */
 549                 pad = &entity->pads[entity->source_pad];
 550                 pad = vsp1_entity_remote_pad(pad);
 551         }
 552
 553         /* The last entity must be the output WPF. */
 554         if (entity != &output->entity)
 555                 ret = -EPIPE;
 556
 557 out:
 558         media_entity_enum_cleanup(&ent_enum);
 559
 560         return ret;
 561 }
 562
 563 static int vsp1_video_pipeline_build(struct vsp1_pipeline *pipe,
 564                                      struct vsp1_video *video)
 565 {
 566         struct media_graph graph;
 567         struct media_entity *entity = &video->video.entity;
 568         struct media_device *mdev = entity->graph_obj.mdev;
 569         unsigned int i;
 570         int ret;
 571
 572         /* Walk the graph to locate the entities and video nodes. */
 573         ret = media_graph_walk_init(&graph, mdev);
 574         if (ret)
 575                 return ret;
 576
 577         media_graph_walk_start(&graph, entity);
 578
 579         while ((entity = media_graph_walk_next(&graph))) {
 580                 struct v4l2_subdev *subdev;
 581                 struct vsp1_rwpf *rwpf;
 582                 struct vsp1_entity *e;
 583
 584                 if (!is_media_entity_v4l2_subdev(entity))
 585                         continue;
 586
 587                 subdev = media_entity_to_v4l2_subdev(entity);
 588                 e = to_vsp1_entity(subdev);
 589                 list_add_tail(&e->list_pipe, &pipe->entities);
 590
 591                 if (e->type == VSP1_ENTITY_RPF) {
 592                         rwpf = to_rwpf(subdev);
 593                         pipe->inputs[rwpf->entity.index] = rwpf;
 594                         rwpf->video->pipe_index = ++pipe->num_inputs;
 595                         rwpf->pipe = pipe;
 596                 } else if (e->type == VSP1_ENTITY_WPF) {
 597                         rwpf = to_rwpf(subdev);
 598                         pipe->output = rwpf;
 599                         rwpf->video->pipe_index = 0;
 600                         rwpf->pipe = pipe;
 601                 } else if (e->type == VSP1_ENTITY_LIF) {
 602                         pipe->lif = e;
 603                 } else if (e->type == VSP1_ENTITY_BRU) {
 604                         pipe->bru = e;
 605                 } else if (e->type == VSP1_ENTITY_HGO) {
 606                         struct vsp1_hgo *hgo = to_hgo(subdev);
 607
 608                         pipe->hgo = e;
 609                         hgo->histo.pipe = pipe;
 610                 }
 611         }
 612
 613         media_graph_walk_cleanup(&graph);
 614
 615         /* We need one output and at least one input. */
 616         if (pipe->num_inputs == 0 || !pipe->output)
 617                 return -EPIPE;
 618
 619         /*
 620          * Follow links downstream for each input and make sure the graph
 621          * contains no loop and that all branches end at the output WPF.
 622          */
 623         for (i = 0; i < video->vsp1->info->rpf_count; ++i) {
 624                 if (!pipe->inputs[i])
 625                         continue;
 626
 627                 ret = vsp1_video_pipeline_build_branch(pipe, pipe->inputs[i],
 628                                                        pipe->output);
 629                 if (ret < 0)
 630                         return ret;
 631         }
 632
 633         return 0;
 634 }
 635
 636 static int vsp1_video_pipeline_init(struct vsp1_pipeline *pipe,
 637                                     struct vsp1_video *video)
 638 {
 639         vsp1_pipeline_init(pipe);
 640
 641         pipe->frame_end = vsp1_video_pipeline_frame_end;
 642
 643         return vsp1_video_pipeline_build(pipe, video);
 644 }
 645
 646 static struct vsp1_pipeline *vsp1_video_pipeline_get(struct vsp1_video *video)
 647 {
 648         struct vsp1_pipeline *pipe;
 649         int ret;
 650
 651         /*
 652          * Get a pipeline object for the video node. If a pipeline has already
 653          * been allocated just increment its reference count and return it.
 654          * Otherwise allocate a new pipeline and initialize it, it will be freed
 655          * when the last reference is released.
 656          */
 657         if (!video->rwpf->pipe) {
 658                 pipe = kzalloc(sizeof(*pipe), GFP_KERNEL);
 659                 if (!pipe)
 660                         return ERR_PTR(-ENOMEM);
 661
 662                 ret = vsp1_video_pipeline_init(pipe, video);
 663                 if (ret < 0) {
 664                         vsp1_pipeline_reset(pipe);
 665                         kfree(pipe);
 666                         return ERR_PTR(ret);
 667                 }
 668         } else {
 669                 pipe = video->rwpf->pipe;
 670                 kref_get(&pipe->kref);
 671         }
 672
 673         return pipe;
 674 }
 675
 676 static void vsp1_video_pipeline_release(struct kref *kref)
 677 {
 678         struct vsp1_pipeline *pipe = container_of(kref, typeof(*pipe), kref);
 679
 680         vsp1_pipeline_reset(pipe);
 681         kfree(pipe);
 682 }
 683
 684 static void vsp1_video_pipeline_put(struct vsp1_pipeline *pipe)
 685 {
 686         struct media_device *mdev = &pipe->output->entity.vsp1->media_dev;
 687
 688         mutex_lock(&mdev->graph_mutex);
 689         kref_put(&pipe->kref, vsp1_video_pipeline_release);
 690         mutex_unlock(&mdev->graph_mutex);
 691 }
 692
 693 /* -----------------------------------------------------------------------------
 694  * videobuf2 Queue Operations
 695  */
 696
 697 static int
 698 vsp1_video_queue_setup(struct vb2_queue *vq,
 699                        unsigned int *nbuffers, unsigned int *nplanes,
 700                        unsigned int sizes[], struct device *alloc_devs[])
 701 {
 702         struct vsp1_video *video = vb2_get_drv_priv(vq);
 703         const struct v4l2_pix_format_mplane *format = &video->rwpf->format;
 704         unsigned int i;
 705
 706         if (*nplanes) {
 707                 if (*nplanes != format->num_planes)
 708                         return -EINVAL;
 709
 710                 for (i = 0; i < *nplanes; i++)
 711                         if (sizes[i] < format->plane_fmt[i].sizeimage)
 712                                 return -EINVAL;
 713                 return 0;
 714         }
 715
 716         *nplanes = format->num_planes;
 717
 718         for (i = 0; i < format->num_planes; ++i)
 719                 sizes[i] = format->plane_fmt[i].sizeimage;
 720
 721         return 0;
 722 }
 723
 724 static int vsp1_video_buffer_prepare(struct vb2_buffer *vb)
 725 {
 726         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 727         struct vsp1_video *video = vb2_get_drv_priv(vb->vb2_queue);
 728         struct vsp1_vb2_buffer *buf = to_vsp1_vb2_buffer(vbuf);
 729         const struct v4l2_pix_format_mplane *format = &video->rwpf->format;
 730         unsigned int i;
 731
 732         if (vb->num_planes < format->num_planes)
 733                 return -EINVAL;
 734
 735         for (i = 0; i < vb->num_planes; ++i) {
 736                 buf->mem.addr[i] = vb2_dma_contig_plane_dma_addr(vb, i);
 737
 738                 if (vb2_plane_size(vb, i) < format->plane_fmt[i].sizeimage)
 739                         return -EINVAL;
 740         }
 741
 742         for ( ; i < 3; ++i)
 743                 buf->mem.addr[i] = 0;
 744
 745         return 0;
 746 }
 747
 748 static void vsp1_video_buffer_queue(struct vb2_buffer *vb)
 749 {
 750         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 751         struct vsp1_video *video = vb2_get_drv_priv(vb->vb2_queue);
 752         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 753         struct vsp1_vb2_buffer *buf = to_vsp1_vb2_buffer(vbuf);
 754         unsigned long flags;
 755         bool empty;
 756
 757         spin_lock_irqsave(&video->irqlock, flags);
 758         empty = list_empty(&video->irqqueue);
 759         list_add_tail(&buf->queue, &video->irqqueue);
 760         spin_unlock_irqrestore(&video->irqlock, flags);
 761
 762         if (!empty)
 763                 return;
 764
 765         spin_lock_irqsave(&pipe->irqlock, flags);
 766
 767         video->rwpf->mem = buf->mem;
 768         pipe->buffers_ready |= 1 << video->pipe_index;
 769
 770         if (vb2_is_streaming(&video->queue) &&
 771             vsp1_pipeline_ready(pipe))
 772                 vsp1_video_pipeline_run(pipe);
 773
 774         spin_unlock_irqrestore(&pipe->irqlock, flags);
 775 }
 776
 777 static int vsp1_video_setup_pipeline(struct vsp1_pipeline *pipe)
 778 {
 779         struct vsp1_entity *entity;
 780
 781         /* Determine this pipelines sizes for image partitioning support. */
 782         vsp1_video_pipeline_setup_partitions(pipe);
 783
 784         /* Prepare the display list. */
 785         pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
 786         if (!pipe->dl)
 787                 return -ENOMEM;
 788
 789         if (pipe->uds) {
 790                 struct vsp1_uds *uds = to_uds(&pipe->uds->subdev);
 791
 792                 /*
 793                  * If a BRU is present in the pipeline before the UDS, the alpha
 794                  * component doesn't need to be scaled as the BRU output alpha
 795                  * value is fixed to 255. Otherwise we need to scale the alpha
 796                  * component only when available at the input RPF.
 797                  */
 798                 if (pipe->uds_input->type == VSP1_ENTITY_BRU) {
 799                         uds->scale_alpha = false;
 800                 } else {
 801                         struct vsp1_rwpf *rpf =
 802                                 to_rwpf(&pipe->uds_input->subdev);
 803
 804                         uds->scale_alpha = rpf->fmtinfo->alpha;
 805                 }
 806         }
 807
 808         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 809                 vsp1_entity_route_setup(entity, pipe, pipe->dl);
 810
 811                 if (entity->ops->configure)
 812                         entity->ops->configure(entity, pipe, pipe->dl,
 813                                                VSP1_ENTITY_PARAMS_INIT);
 814         }
 815
 816         return 0;
 817 }
 818
 819 static int vsp1_video_start_streaming(struct vb2_queue *vq, unsigned int count)
 820 {
 821         struct vsp1_video *video = vb2_get_drv_priv(vq);
 822         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 823         bool start_pipeline = false;
 824         unsigned long flags;
 825         int ret;
 826
 827         mutex_lock(&pipe->lock);
 828         if (pipe->stream_count == pipe->num_inputs) {
 829                 ret = vsp1_video_setup_pipeline(pipe);
 830                 if (ret < 0) {
 831                         mutex_unlock(&pipe->lock);
 832                         return ret;
 833                 }
 834
 835                 start_pipeline = true;
 836         }
 837
 838         pipe->stream_count++;
 839         mutex_unlock(&pipe->lock);
 840
 841         /*
 842          * vsp1_pipeline_ready() is not sufficient to establish that all streams
 843          * are prepared and the pipeline is configured, as multiple streams
 844          * can race through streamon with buffers already queued; Therefore we
 845          * don't even attempt to start the pipeline until the last stream has
 846          * called through here.
 847          */
 848         if (!start_pipeline)
 849                 return 0;
 850
 851         spin_lock_irqsave(&pipe->irqlock, flags);
 852         if (vsp1_pipeline_ready(pipe))
 853                 vsp1_video_pipeline_run(pipe);
 854         spin_unlock_irqrestore(&pipe->irqlock, flags);
 855
 856         return 0;
 857 }
 858
 859 static void vsp1_video_stop_streaming(struct vb2_queue *vq)
 860 {
 861         struct vsp1_video *video = vb2_get_drv_priv(vq);
 862         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 863         struct vsp1_vb2_buffer *buffer;
 864         unsigned long flags;
 865         int ret;
 866
 867         /*
 868          * Clear the buffers ready flag to make sure the device won't be started
 869          * by a QBUF on the video node on the other side of the pipeline.
 870          */
 871         spin_lock_irqsave(&video->irqlock, flags);
 872         pipe->buffers_ready &= ~(1 << video->pipe_index);
 873         spin_unlock_irqrestore(&video->irqlock, flags);
 874
 875         mutex_lock(&pipe->lock);
 876         if (--pipe->stream_count == pipe->num_inputs) {
 877                 /* Stop the pipeline. */
 878                 ret = vsp1_pipeline_stop(pipe);
 879                 if (ret == -ETIMEDOUT)
 880                         dev_err(video->vsp1->dev, "pipeline stop timeout\n");
 881
 882                 vsp1_dl_list_put(pipe->dl);
 883                 pipe->dl = NULL;
 884         }
 885         mutex_unlock(&pipe->lock);
 886
 887         media_pipeline_stop(&video->video.entity);
 888         vsp1_video_pipeline_put(pipe);
 889
 890         /* Remove all buffers from the IRQ queue. */
 891         spin_lock_irqsave(&video->irqlock, flags);
 892         list_for_each_entry(buffer, &video->irqqueue, queue)
 893                 vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR);
 894         INIT_LIST_HEAD(&video->irqqueue);
 895         spin_unlock_irqrestore(&video->irqlock, flags);
 896 }
 897
 898 static const struct vb2_ops vsp1_video_queue_qops = {
 899         .queue_setup = vsp1_video_queue_setup,
 900         .buf_prepare = vsp1_video_buffer_prepare,
 901         .buf_queue = vsp1_video_buffer_queue,
 902         .wait_prepare = vb2_ops_wait_prepare,
 903         .wait_finish = vb2_ops_wait_finish,
 904         .start_streaming = vsp1_video_start_streaming,
 905         .stop_streaming = vsp1_video_stop_streaming,
 906 };
 907
 908 /* -----------------------------------------------------------------------------
 909  * V4L2 ioctls
 910  */
 911
 912 static int
 913 vsp1_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 914 {
 915         struct v4l2_fh *vfh = file->private_data;
 916         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 917
 918         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 919                           | V4L2_CAP_VIDEO_CAPTURE_MPLANE
 920                           | V4L2_CAP_VIDEO_OUTPUT_MPLANE;
 921
 922         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
 923                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE
 924                                  | V4L2_CAP_STREAMING;
 925         else
 926                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT_MPLANE
 927                                  | V4L2_CAP_STREAMING;
 928
 929         strlcpy(cap->driver, "vsp1", sizeof(cap->driver));
 930         strlcpy(cap->card, video->video.name, sizeof(cap->card));
 931         snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
 932                  dev_name(video->vsp1->dev));
 933
 934         return 0;
 935 }
 936
 937 static int
 938 vsp1_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
 939 {
 940         struct v4l2_fh *vfh = file->private_data;
 941         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 942
 943         if (format->type != video->queue.type)
 944                 return -EINVAL;
 945
 946         mutex_lock(&video->lock);
 947         format->fmt.pix_mp = video->rwpf->format;
 948         mutex_unlock(&video->lock);
 949
 950         return 0;
 951 }
 952
 953 static int
 954 vsp1_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
 955 {
 956         struct v4l2_fh *vfh = file->private_data;
 957         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 958
 959         if (format->type != video->queue.type)
 960                 return -EINVAL;
 961
 962         return __vsp1_video_try_format(video, &format->fmt.pix_mp, NULL);
 963 }
 964
 965 static int
 966 vsp1_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
 967 {
 968         struct v4l2_fh *vfh = file->private_data;
 969         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 970         const struct vsp1_format_info *info;
 971         int ret;
 972
 973         if (format->type != video->queue.type)
 974                 return -EINVAL;
 975
 976         ret = __vsp1_video_try_format(video, &format->fmt.pix_mp, &info);
 977         if (ret < 0)
 978                 return ret;
 979
 980         mutex_lock(&video->lock);
 981
 982         if (vb2_is_busy(&video->queue)) {
 983                 ret = -EBUSY;
 984                 goto done;
 985         }
 986
 987         video->rwpf->format = format->fmt.pix_mp;
 988         video->rwpf->fmtinfo = info;
 989
 990 done:
 991         mutex_unlock(&video->lock);
 992         return ret;
 993 }
 994
 995 static int
 996 vsp1_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 997 {
 998         struct v4l2_fh *vfh = file->private_data;
 999         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
1000         struct media_device *mdev = &video->vsp1->media_dev;
1001         struct vsp1_pipeline *pipe;
1002         int ret;
1003
1004         if (video->queue.owner && video->queue.owner != file->private_data)
1005                 return -EBUSY;
1006
1007         /*
1008          * Get a pipeline for the video node and start streaming on it. No link
1009          * touching an entity in the pipeline can be activated or deactivated
1010          * once streaming is started.
1011          */
1012         mutex_lock(&mdev->graph_mutex);
1013
1014         pipe = vsp1_video_pipeline_get(video);
1015         if (IS_ERR(pipe)) {
1016                 mutex_unlock(&mdev->graph_mutex);
1017                 return PTR_ERR(pipe);
1018         }
1019
1020         ret = __media_pipeline_start(&video->video.entity, &pipe->pipe);
1021         if (ret < 0) {
1022                 mutex_unlock(&mdev->graph_mutex);
1023                 goto err_pipe;
1024         }
1025
1026         mutex_unlock(&mdev->graph_mutex);
1027
1028         /*
1029          * Verify that the configured format matches the output of the connected
1030          * subdev.
1031          */
1032         ret = vsp1_video_verify_format(video);
1033         if (ret < 0)
1034                 goto err_stop;
1035
1036         /* Start the queue. */
1037         ret = vb2_streamon(&video->queue, type);
1038         if (ret < 0)
1039                 goto err_stop;
1040
1041         return 0;
1042
1043 err_stop:
1044         media_pipeline_stop(&video->video.entity);
1045 err_pipe:
1046         vsp1_video_pipeline_put(pipe);
1047         return ret;
1048 }
1049
1050 static const struct v4l2_ioctl_ops vsp1_video_ioctl_ops = {
1051         .vidioc_querycap                = vsp1_video_querycap,
1052         .vidioc_g_fmt_vid_cap_mplane    = vsp1_video_get_format,
1053         .vidioc_s_fmt_vid_cap_mplane    = vsp1_video_set_format,
1054         .vidioc_try_fmt_vid_cap_mplane  = vsp1_video_try_format,
1055         .vidioc_g_fmt_vid_out_mplane    = vsp1_video_get_format,
1056         .vidioc_s_fmt_vid_out_mplane    = vsp1_video_set_format,
1057         .vidioc_try_fmt_vid_out_mplane  = vsp1_video_try_format,
1058         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
1059         .vidioc_querybuf                = vb2_ioctl_querybuf,
1060         .vidioc_qbuf                    = vb2_ioctl_qbuf,
1061         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
1062         .vidioc_expbuf                  = vb2_ioctl_expbuf,
1063         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
1064         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
1065         .vidioc_streamon                = vsp1_video_streamon,
1066         .vidioc_streamoff               = vb2_ioctl_streamoff,
1067 };
1068
1069 /* -----------------------------------------------------------------------------
1070  * V4L2 File Operations
1071  */
1072
1073 static int vsp1_video_open(struct file *file)
1074 {
1075         struct vsp1_video *video = video_drvdata(file);
1076         struct v4l2_fh *vfh;
1077         int ret = 0;
1078
1079         vfh = kzalloc(sizeof(*vfh), GFP_KERNEL);
1080         if (vfh == NULL)
1081                 return -ENOMEM;
1082
1083         v4l2_fh_init(vfh, &video->video);
1084         v4l2_fh_add(vfh);
1085
1086         file->private_data = vfh;
1087
1088         ret = vsp1_device_get(video->vsp1);
1089         if (ret < 0) {
1090                 v4l2_fh_del(vfh);
1091                 v4l2_fh_exit(vfh);
1092                 kfree(vfh);
1093         }
1094
1095         return ret;
1096 }
1097
1098 static int vsp1_video_release(struct file *file)
1099 {
1100         struct vsp1_video *video = video_drvdata(file);
1101         struct v4l2_fh *vfh = file->private_data;
1102
1103         mutex_lock(&video->lock);
1104         if (video->queue.owner == vfh) {
1105                 vb2_queue_release(&video->queue);
1106                 video->queue.owner = NULL;
1107         }
1108         mutex_unlock(&video->lock);
1109
1110         vsp1_device_put(video->vsp1);
1111
1112         v4l2_fh_release(file);
1113
1114         file->private_data = NULL;
1115
1116         return 0;
1117 }
1118
1119 static const struct v4l2_file_operations vsp1_video_fops = {
1120         .owner = THIS_MODULE,
1121         .unlocked_ioctl = video_ioctl2,
1122         .open = vsp1_video_open,
1123         .release = vsp1_video_release,
1124         .poll = vb2_fop_poll,
1125         .mmap = vb2_fop_mmap,
1126 };
1127
1128 /* -----------------------------------------------------------------------------
1129  * Initialization and Cleanup
1130  */
1131
1132 struct vsp1_video *vsp1_video_create(struct vsp1_device *vsp1,
1133                                      struct vsp1_rwpf *rwpf)
1134 {
1135         struct vsp1_video *video;
1136         const char *direction;
1137         int ret;
1138
1139         video = devm_kzalloc(vsp1->dev, sizeof(*video), GFP_KERNEL);
1140         if (!video)
1141                 return ERR_PTR(-ENOMEM);
1142
1143         rwpf->video = video;
1144
1145         video->vsp1 = vsp1;
1146         video->rwpf = rwpf;
1147
1148         if (rwpf->entity.type == VSP1_ENTITY_RPF) {
1149                 direction = "input";
1150                 video->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
1151                 video->pad.flags = MEDIA_PAD_FL_SOURCE;
1152                 video->video.vfl_dir = VFL_DIR_TX;
1153         } else {
1154                 direction = "output";
1155                 video->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
1156                 video->pad.flags = MEDIA_PAD_FL_SINK;
1157                 video->video.vfl_dir = VFL_DIR_RX;
1158         }
1159
1160         mutex_init(&video->lock);
1161         spin_lock_init(&video->irqlock);
1162         INIT_LIST_HEAD(&video->irqqueue);
1163
1164         /* Initialize the media entity... */
1165         ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
1166         if (ret < 0)
1167                 return ERR_PTR(ret);
1168
1169         /* ... and the format ... */
1170         rwpf->format.pixelformat = VSP1_VIDEO_DEF_FORMAT;
1171         rwpf->format.width = VSP1_VIDEO_DEF_WIDTH;
1172         rwpf->format.height = VSP1_VIDEO_DEF_HEIGHT;
1173         __vsp1_video_try_format(video, &rwpf->format, &rwpf->fmtinfo);
1174
1175         /* ... and the video node... */
1176         video->video.v4l2_dev = &video->vsp1->v4l2_dev;
1177         video->video.fops = &vsp1_video_fops;
1178         snprintf(video->video.name, sizeof(video->video.name), "%s %s",
1179                  rwpf->entity.subdev.name, direction);
1180         video->video.vfl_type = VFL_TYPE_GRABBER;
1181         video->video.release = video_device_release_empty;
1182         video->video.ioctl_ops = &vsp1_video_ioctl_ops;
1183
1184         video_set_drvdata(&video->video, video);
1185
1186         video->queue.type = video->type;
1187         video->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
1188         video->queue.lock = &video->lock;
1189         video->queue.drv_priv = video;
1190         video->queue.buf_struct_size = sizeof(struct vsp1_vb2_buffer);
1191         video->queue.ops = &vsp1_video_queue_qops;
1192         video->queue.mem_ops = &vb2_dma_contig_memops;
1193         video->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
1194         video->queue.dev = video->vsp1->dev;
1195         ret = vb2_queue_init(&video->queue);
1196         if (ret < 0) {
1197                 dev_err(video->vsp1->dev, "failed to initialize vb2 queue\n");
1198                 goto error;
1199         }
1200
1201         /* ... and register the video device. */
1202         video->video.queue = &video->queue;
1203         ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1204         if (ret < 0) {
1205                 dev_err(video->vsp1->dev, "failed to register video device\n");
1206                 goto error;
1207         }
1208
1209         return video;
1210
1211 error:
1212         vsp1_video_cleanup(video);
1213         return ERR_PTR(ret);
1214 }
1215
1216 void vsp1_video_cleanup(struct vsp1_video *video)
1217 {
1218         if (video_is_registered(&video->video))
1219                 video_unregister_device(&video->video);
1220
1221         media_entity_cleanup(&video->video.entity);
1222 }