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_pipe.h"
  35 #include "vsp1_rwpf.h"
  36 #include "vsp1_uds.h"
  37 #include "vsp1_video.h"
  38
  39 #define VSP1_VIDEO_DEF_FORMAT           V4L2_PIX_FMT_YUYV
  40 #define VSP1_VIDEO_DEF_WIDTH            1024
  41 #define VSP1_VIDEO_DEF_HEIGHT           768
  42
  43 #define VSP1_VIDEO_MIN_WIDTH            2U
  44 #define VSP1_VIDEO_MAX_WIDTH            8190U
  45 #define VSP1_VIDEO_MIN_HEIGHT           2U
  46 #define VSP1_VIDEO_MAX_HEIGHT           8190U
  47
  48 /* -----------------------------------------------------------------------------
  49  * Helper functions
  50  */
  51
  52 static struct v4l2_subdev *
  53 vsp1_video_remote_subdev(struct media_pad *local, u32 *pad)
  54 {
  55         struct media_pad *remote;
  56
  57         remote = media_entity_remote_pad(local);
  58         if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
  59                 return NULL;
  60
  61         if (pad)
  62                 *pad = remote->index;
  63
  64         return media_entity_to_v4l2_subdev(remote->entity);
  65 }
  66
  67 static int vsp1_video_verify_format(struct vsp1_video *video)
  68 {
  69         struct v4l2_subdev_format fmt;
  70         struct v4l2_subdev *subdev;
  71         int ret;
  72
  73         subdev = vsp1_video_remote_subdev(&video->pad, &fmt.pad);
  74         if (subdev == NULL)
  75                 return -EINVAL;
  76
  77         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
  78         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
  79         if (ret < 0)
  80                 return ret == -ENOIOCTLCMD ? -EINVAL : ret;
  81
  82         if (video->rwpf->fmtinfo->mbus != fmt.format.code ||
  83             video->rwpf->format.height != fmt.format.height ||
  84             video->rwpf->format.width != fmt.format.width)
  85                 return -EINVAL;
  86
  87         return 0;
  88 }
  89
  90 static int __vsp1_video_try_format(struct vsp1_video *video,
  91                                    struct v4l2_pix_format_mplane *pix,
  92                                    const struct vsp1_format_info **fmtinfo)
  93 {
  94         static const u32 xrgb_formats[][2] = {
  95                 { V4L2_PIX_FMT_RGB444, V4L2_PIX_FMT_XRGB444 },
  96                 { V4L2_PIX_FMT_RGB555, V4L2_PIX_FMT_XRGB555 },
  97                 { V4L2_PIX_FMT_BGR32, V4L2_PIX_FMT_XBGR32 },
  98                 { V4L2_PIX_FMT_RGB32, V4L2_PIX_FMT_XRGB32 },
  99         };
 100
 101         const struct vsp1_format_info *info;
 102         unsigned int width = pix->width;
 103         unsigned int height = pix->height;
 104         unsigned int i;
 105
 106         /* Backward compatibility: replace deprecated RGB formats by their XRGB
 107          * equivalent. This selects the format older userspace applications want
 108          * while still exposing the new format.
 109          */
 110         for (i = 0; i < ARRAY_SIZE(xrgb_formats); ++i) {
 111                 if (xrgb_formats[i][0] == pix->pixelformat) {
 112                         pix->pixelformat = xrgb_formats[i][1];
 113                         break;
 114                 }
 115         }
 116
 117         /* Retrieve format information and select the default format if the
 118          * requested format isn't supported.
 119          */
 120         info = vsp1_get_format_info(video->vsp1, pix->pixelformat);
 121         if (info == NULL)
 122                 info = vsp1_get_format_info(video->vsp1, VSP1_VIDEO_DEF_FORMAT);
 123
 124         pix->pixelformat = info->fourcc;
 125         pix->colorspace = V4L2_COLORSPACE_SRGB;
 126         pix->field = V4L2_FIELD_NONE;
 127         memset(pix->reserved, 0, sizeof(pix->reserved));
 128
 129         /* Align the width and height for YUV 4:2:2 and 4:2:0 formats. */
 130         width = round_down(width, info->hsub);
 131         height = round_down(height, info->vsub);
 132
 133         /* Clamp the width and height. */
 134         pix->width = clamp(width, VSP1_VIDEO_MIN_WIDTH, VSP1_VIDEO_MAX_WIDTH);
 135         pix->height = clamp(height, VSP1_VIDEO_MIN_HEIGHT,
 136                             VSP1_VIDEO_MAX_HEIGHT);
 137
 138         /* Compute and clamp the stride and image size. While not documented in
 139          * the datasheet, strides not aligned to a multiple of 128 bytes result
 140          * in image corruption.
 141          */
 142         for (i = 0; i < min(info->planes, 2U); ++i) {
 143                 unsigned int hsub = i > 0 ? info->hsub : 1;
 144                 unsigned int vsub = i > 0 ? info->vsub : 1;
 145                 unsigned int align = 128;
 146                 unsigned int bpl;
 147
 148                 bpl = clamp_t(unsigned int, pix->plane_fmt[i].bytesperline,
 149                               pix->width / hsub * info->bpp[i] / 8,
 150                               round_down(65535U, align));
 151
 152                 pix->plane_fmt[i].bytesperline = round_up(bpl, align);
 153                 pix->plane_fmt[i].sizeimage = pix->plane_fmt[i].bytesperline
 154                                             * pix->height / vsub;
 155         }
 156
 157         if (info->planes == 3) {
 158                 /* The second and third planes must have the same stride. */
 159                 pix->plane_fmt[2].bytesperline = pix->plane_fmt[1].bytesperline;
 160                 pix->plane_fmt[2].sizeimage = pix->plane_fmt[1].sizeimage;
 161         }
 162
 163         pix->num_planes = info->planes;
 164
 165         if (fmtinfo)
 166                 *fmtinfo = info;
 167
 168         return 0;
 169 }
 170
 171 /* -----------------------------------------------------------------------------
 172  * VSP1 Partition Algorithm support
 173  */
 174
 175 static void vsp1_video_pipeline_setup_partitions(struct vsp1_pipeline *pipe)
 176 {
 177         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 178         const struct v4l2_mbus_framefmt *format;
 179         struct vsp1_entity *entity;
 180         unsigned int div_size;
 181
 182         format = vsp1_entity_get_pad_format(&pipe->output->entity,
 183                                             pipe->output->entity.config,
 184                                             RWPF_PAD_SOURCE);
 185         div_size = format->width;
 186
 187         /* Gen2 hardware doesn't require image partitioning. */
 188         if (vsp1->info->gen == 2) {
 189                 pipe->div_size = div_size;
 190                 pipe->partitions = 1;
 191                 return;
 192         }
 193
 194         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 195                 unsigned int entity_max = VSP1_VIDEO_MAX_WIDTH;
 196
 197                 if (entity->ops->max_width) {
 198                         entity_max = entity->ops->max_width(entity, pipe);
 199                         if (entity_max)
 200                                 div_size = min(div_size, entity_max);
 201                 }
 202         }
 203
 204         pipe->div_size = div_size;
 205         pipe->partitions = DIV_ROUND_UP(format->width, div_size);
 206 }
 207
 208 /**
 209  * vsp1_video_partition - Calculate the active partition output window
 210  *
 211  * @div_size: pre-determined maximum partition division size
 212  * @index: partition index
 213  *
 214  * Returns a v4l2_rect describing the partition window.
 215  */
 216 static struct v4l2_rect vsp1_video_partition(struct vsp1_pipeline *pipe,
 217                                              unsigned int div_size,
 218                                              unsigned int index)
 219 {
 220         const struct v4l2_mbus_framefmt *format;
 221         struct v4l2_rect partition;
 222         unsigned int modulus;
 223
 224         format = vsp1_entity_get_pad_format(&pipe->output->entity,
 225                                             pipe->output->entity.config,
 226                                             RWPF_PAD_SOURCE);
 227
 228         /* A single partition simply processes the output size in full. */
 229         if (pipe->partitions <= 1) {
 230                 partition.left = 0;
 231                 partition.top = 0;
 232                 partition.width = format->width;
 233                 partition.height = format->height;
 234                 return partition;
 235         }
 236
 237         /* Initialise the partition with sane starting conditions. */
 238         partition.left = index * div_size;
 239         partition.top = 0;
 240         partition.width = div_size;
 241         partition.height = format->height;
 242
 243         modulus = format->width % div_size;
 244
 245         /*
 246          * We need to prevent the last partition from being smaller than the
 247          * *minimum* width of the hardware capabilities.
 248          *
 249          * If the modulus is less than half of the partition size,
 250          * the penultimate partition is reduced to half, which is added
 251          * to the final partition: |1234|1234|1234|12|341|
 252          * to prevents this:       |1234|1234|1234|1234|1|.
 253          */
 254         if (modulus) {
 255                 /*
 256                  * pipe->partitions is 1 based, whilst index is a 0 based index.
 257                  * Normalise this locally.
 258                  */
 259                 unsigned int partitions = pipe->partitions - 1;
 260
 261                 if (modulus < div_size / 2) {
 262                         if (index == partitions - 1) {
 263                                 /* Halve the penultimate partition. */
 264                                 partition.width = div_size / 2;
 265                         } else if (index == partitions) {
 266                                 /* Increase the final partition. */
 267                                 partition.width = (div_size / 2) + modulus;
 268                                 partition.left -= div_size / 2;
 269                         }
 270                 } else if (index == partitions) {
 271                         partition.width = modulus;
 272                 }
 273         }
 274
 275         return partition;
 276 }
 277
 278 /* -----------------------------------------------------------------------------
 279  * Pipeline Management
 280  */
 281
 282 /*
 283  * vsp1_video_complete_buffer - Complete the current buffer
 284  * @video: the video node
 285  *
 286  * This function completes the current buffer by filling its sequence number,
 287  * time stamp and payload size, and hands it back to the videobuf core.
 288  *
 289  * When operating in DU output mode (deep pipeline to the DU through the LIF),
 290  * the VSP1 needs to constantly supply frames to the display. In that case, if
 291  * no other buffer is queued, reuse the one that has just been processed instead
 292  * of handing it back to the videobuf core.
 293  *
 294  * Return the next queued buffer or NULL if the queue is empty.
 295  */
 296 static struct vsp1_vb2_buffer *
 297 vsp1_video_complete_buffer(struct vsp1_video *video)
 298 {
 299         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 300         struct vsp1_vb2_buffer *next = NULL;
 301         struct vsp1_vb2_buffer *done;
 302         unsigned long flags;
 303         unsigned int i;
 304
 305         spin_lock_irqsave(&video->irqlock, flags);
 306
 307         if (list_empty(&video->irqqueue)) {
 308                 spin_unlock_irqrestore(&video->irqlock, flags);
 309                 return NULL;
 310         }
 311
 312         done = list_first_entry(&video->irqqueue,
 313                                 struct vsp1_vb2_buffer, queue);
 314
 315         /* In DU output mode reuse the buffer if the list is singular. */
 316         if (pipe->lif && list_is_singular(&video->irqqueue)) {
 317                 spin_unlock_irqrestore(&video->irqlock, flags);
 318                 return done;
 319         }
 320
 321         list_del(&done->queue);
 322
 323         if (!list_empty(&video->irqqueue))
 324                 next = list_first_entry(&video->irqqueue,
 325                                         struct vsp1_vb2_buffer, queue);
 326
 327         spin_unlock_irqrestore(&video->irqlock, flags);
 328
 329         done->buf.sequence = pipe->sequence;
 330         done->buf.vb2_buf.timestamp = ktime_get_ns();
 331         for (i = 0; i < done->buf.vb2_buf.num_planes; ++i)
 332                 vb2_set_plane_payload(&done->buf.vb2_buf, i,
 333                                       vb2_plane_size(&done->buf.vb2_buf, i));
 334         vb2_buffer_done(&done->buf.vb2_buf, VB2_BUF_STATE_DONE);
 335
 336         return next;
 337 }
 338
 339 static void vsp1_video_frame_end(struct vsp1_pipeline *pipe,
 340                                  struct vsp1_rwpf *rwpf)
 341 {
 342         struct vsp1_video *video = rwpf->video;
 343         struct vsp1_vb2_buffer *buf;
 344
 345         buf = vsp1_video_complete_buffer(video);
 346         if (buf == NULL)
 347                 return;
 348
 349         video->rwpf->mem = buf->mem;
 350         pipe->buffers_ready |= 1 << video->pipe_index;
 351 }
 352
 353 static void vsp1_video_pipeline_run_partition(struct vsp1_pipeline *pipe,
 354                                               struct vsp1_dl_list *dl)
 355 {
 356         struct vsp1_entity *entity;
 357
 358         pipe->partition = vsp1_video_partition(pipe, pipe->div_size,
 359                                                pipe->current_partition);
 360
 361         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 362                 if (entity->ops->configure)
 363                         entity->ops->configure(entity, pipe, dl,
 364                                                VSP1_ENTITY_PARAMS_PARTITION);
 365         }
 366 }
 367
 368 static void vsp1_video_pipeline_run(struct vsp1_pipeline *pipe)
 369 {
 370         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 371         struct vsp1_entity *entity;
 372
 373         if (!pipe->dl)
 374                 pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
 375
 376         /*
 377          * Start with the runtime parameters as the configure operation can
 378          * compute/cache information needed when configuring partitions. This
 379          * is the case with flipping in the WPF.
 380          */
 381         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 382                 if (entity->ops->configure)
 383                         entity->ops->configure(entity, pipe, pipe->dl,
 384                                                VSP1_ENTITY_PARAMS_RUNTIME);
 385         }
 386
 387         /* Run the first partition */
 388         pipe->current_partition = 0;
 389         vsp1_video_pipeline_run_partition(pipe, pipe->dl);
 390
 391         /* Process consecutive partitions as necessary */
 392         for (pipe->current_partition = 1;
 393              pipe->current_partition < pipe->partitions;
 394              pipe->current_partition++) {
 395                 struct vsp1_dl_list *dl;
 396
 397                 /*
 398                  * Partition configuration operations will utilise
 399                  * the pipe->current_partition variable to determine
 400                  * the work they should complete.
 401                  */
 402                 dl = vsp1_dl_list_get(pipe->output->dlm);
 403
 404                 /*
 405                  * An incomplete chain will still function, but output only
 406                  * the partitions that had a dl available. The frame end
 407                  * interrupt will be marked on the last dl in the chain.
 408                  */
 409                 if (!dl) {
 410                         dev_err(vsp1->dev, "Failed to obtain a dl list. Frame will be incomplete\n");
 411                         break;
 412                 }
 413
 414                 vsp1_video_pipeline_run_partition(pipe, dl);
 415                 vsp1_dl_list_add_chain(pipe->dl, dl);
 416         }
 417
 418         /* Complete, and commit the head display list. */
 419         vsp1_dl_list_commit(pipe->dl);
 420         pipe->dl = NULL;
 421
 422         vsp1_pipeline_run(pipe);
 423 }
 424
 425 static void vsp1_video_pipeline_frame_end(struct vsp1_pipeline *pipe)
 426 {
 427         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 428         enum vsp1_pipeline_state state;
 429         unsigned long flags;
 430         unsigned int i;
 431
 432         spin_lock_irqsave(&pipe->irqlock, flags);
 433
 434         /* Complete buffers on all video nodes. */
 435         for (i = 0; i < vsp1->info->rpf_count; ++i) {
 436                 if (!pipe->inputs[i])
 437                         continue;
 438
 439                 vsp1_video_frame_end(pipe, pipe->inputs[i]);
 440         }
 441
 442         vsp1_video_frame_end(pipe, pipe->output);
 443
 444         state = pipe->state;
 445         pipe->state = VSP1_PIPELINE_STOPPED;
 446
 447         /* If a stop has been requested, mark the pipeline as stopped and
 448          * return. Otherwise restart the pipeline if ready.
 449          */
 450         if (state == VSP1_PIPELINE_STOPPING)
 451                 wake_up(&pipe->wq);
 452         else if (vsp1_pipeline_ready(pipe))
 453                 vsp1_video_pipeline_run(pipe);
 454
 455         spin_unlock_irqrestore(&pipe->irqlock, flags);
 456 }
 457
 458 static int vsp1_video_pipeline_build_branch(struct vsp1_pipeline *pipe,
 459                                             struct vsp1_rwpf *input,
 460                                             struct vsp1_rwpf *output)
 461 {
 462         struct media_entity_enum ent_enum;
 463         struct vsp1_entity *entity;
 464         struct media_pad *pad;
 465         bool bru_found = false;
 466         int ret;
 467
 468         ret = media_entity_enum_init(&ent_enum, &input->entity.vsp1->media_dev);
 469         if (ret < 0)
 470                 return ret;
 471
 472         pad = media_entity_remote_pad(&input->entity.pads[RWPF_PAD_SOURCE]);
 473
 474         while (1) {
 475                 if (pad == NULL) {
 476                         ret = -EPIPE;
 477                         goto out;
 478                 }
 479
 480                 /* We've reached a video node, that shouldn't have happened. */
 481                 if (!is_media_entity_v4l2_subdev(pad->entity)) {
 482                         ret = -EPIPE;
 483                         goto out;
 484                 }
 485
 486                 entity = to_vsp1_entity(
 487                         media_entity_to_v4l2_subdev(pad->entity));
 488
 489                 /* A BRU is present in the pipeline, store the BRU input pad
 490                  * number in the input RPF for use when configuring the RPF.
 491                  */
 492                 if (entity->type == VSP1_ENTITY_BRU) {
 493                         struct vsp1_bru *bru = to_bru(&entity->subdev);
 494
 495                         bru->inputs[pad->index].rpf = input;
 496                         input->bru_input = pad->index;
 497
 498                         bru_found = true;
 499                 }
 500
 501                 /* We've reached the WPF, we're done. */
 502                 if (entity->type == VSP1_ENTITY_WPF)
 503                         break;
 504
 505                 /* Ensure the branch has no loop. */
 506                 if (media_entity_enum_test_and_set(&ent_enum,
 507                                                    &entity->subdev.entity)) {
 508                         ret = -EPIPE;
 509                         goto out;
 510                 }
 511
 512                 /* UDS can't be chained. */
 513                 if (entity->type == VSP1_ENTITY_UDS) {
 514                         if (pipe->uds) {
 515                                 ret = -EPIPE;
 516                                 goto out;
 517                         }
 518
 519                         pipe->uds = entity;
 520                         pipe->uds_input = bru_found ? pipe->bru
 521                                         : &input->entity;
 522                 }
 523
 524                 /* Follow the source link. The link setup operations ensure
 525                  * that the output fan-out can't be more than one, there is thus
 526                  * no need to verify here that only a single source link is
 527                  * activated.
 528                  */
 529                 pad = &entity->pads[entity->source_pad];
 530                 pad = media_entity_remote_pad(pad);
 531         }
 532
 533         /* The last entity must be the output WPF. */
 534         if (entity != &output->entity)
 535                 ret = -EPIPE;
 536
 537 out:
 538         media_entity_enum_cleanup(&ent_enum);
 539
 540         return ret;
 541 }
 542
 543 static int vsp1_video_pipeline_build(struct vsp1_pipeline *pipe,
 544                                      struct vsp1_video *video)
 545 {
 546         struct media_entity_graph graph;
 547         struct media_entity *entity = &video->video.entity;
 548         struct media_device *mdev = entity->graph_obj.mdev;
 549         unsigned int i;
 550         int ret;
 551
 552         /* Walk the graph to locate the entities and video nodes. */
 553         ret = media_entity_graph_walk_init(&graph, mdev);
 554         if (ret)
 555                 return ret;
 556
 557         media_entity_graph_walk_start(&graph, entity);
 558
 559         while ((entity = media_entity_graph_walk_next(&graph))) {
 560                 struct v4l2_subdev *subdev;
 561                 struct vsp1_rwpf *rwpf;
 562                 struct vsp1_entity *e;
 563
 564                 if (!is_media_entity_v4l2_subdev(entity))
 565                         continue;
 566
 567                 subdev = media_entity_to_v4l2_subdev(entity);
 568                 e = to_vsp1_entity(subdev);
 569                 list_add_tail(&e->list_pipe, &pipe->entities);
 570
 571                 if (e->type == VSP1_ENTITY_RPF) {
 572                         rwpf = to_rwpf(subdev);
 573                         pipe->inputs[rwpf->entity.index] = rwpf;
 574                         rwpf->video->pipe_index = ++pipe->num_inputs;
 575                         rwpf->pipe = pipe;
 576                 } else if (e->type == VSP1_ENTITY_WPF) {
 577                         rwpf = to_rwpf(subdev);
 578                         pipe->output = rwpf;
 579                         rwpf->video->pipe_index = 0;
 580                         rwpf->pipe = pipe;
 581                 } else if (e->type == VSP1_ENTITY_LIF) {
 582                         pipe->lif = e;
 583                 } else if (e->type == VSP1_ENTITY_BRU) {
 584                         pipe->bru = e;
 585                 }
 586         }
 587
 588         media_entity_graph_walk_cleanup(&graph);
 589
 590         /* We need one output and at least one input. */
 591         if (pipe->num_inputs == 0 || !pipe->output)
 592                 return -EPIPE;
 593
 594         /* Follow links downstream for each input and make sure the graph
 595          * contains no loop and that all branches end at the output WPF.
 596          */
 597         for (i = 0; i < video->vsp1->info->rpf_count; ++i) {
 598                 if (!pipe->inputs[i])
 599                         continue;
 600
 601                 ret = vsp1_video_pipeline_build_branch(pipe, pipe->inputs[i],
 602                                                        pipe->output);
 603                 if (ret < 0)
 604                         return ret;
 605         }
 606
 607         return 0;
 608 }
 609
 610 static int vsp1_video_pipeline_init(struct vsp1_pipeline *pipe,
 611                                     struct vsp1_video *video)
 612 {
 613         vsp1_pipeline_init(pipe);
 614
 615         pipe->frame_end = vsp1_video_pipeline_frame_end;
 616
 617         return vsp1_video_pipeline_build(pipe, video);
 618 }
 619
 620 static struct vsp1_pipeline *vsp1_video_pipeline_get(struct vsp1_video *video)
 621 {
 622         struct vsp1_pipeline *pipe;
 623         int ret;
 624
 625         /* Get a pipeline object for the video node. If a pipeline has already
 626          * been allocated just increment its reference count and return it.
 627          * Otherwise allocate a new pipeline and initialize it, it will be freed
 628          * when the last reference is released.
 629          */
 630         if (!video->rwpf->pipe) {
 631                 pipe = kzalloc(sizeof(*pipe), GFP_KERNEL);
 632                 if (!pipe)
 633                         return ERR_PTR(-ENOMEM);
 634
 635                 ret = vsp1_video_pipeline_init(pipe, video);
 636                 if (ret < 0) {
 637                         vsp1_pipeline_reset(pipe);
 638                         kfree(pipe);
 639                         return ERR_PTR(ret);
 640                 }
 641         } else {
 642                 pipe = video->rwpf->pipe;
 643                 kref_get(&pipe->kref);
 644         }
 645
 646         return pipe;
 647 }
 648
 649 static void vsp1_video_pipeline_release(struct kref *kref)
 650 {
 651         struct vsp1_pipeline *pipe = container_of(kref, typeof(*pipe), kref);
 652
 653         vsp1_pipeline_reset(pipe);
 654         kfree(pipe);
 655 }
 656
 657 static void vsp1_video_pipeline_put(struct vsp1_pipeline *pipe)
 658 {
 659         struct media_device *mdev = &pipe->output->entity.vsp1->media_dev;
 660
 661         mutex_lock(&mdev->graph_mutex);
 662         kref_put(&pipe->kref, vsp1_video_pipeline_release);
 663         mutex_unlock(&mdev->graph_mutex);
 664 }
 665
 666 /* -----------------------------------------------------------------------------
 667  * videobuf2 Queue Operations
 668  */
 669
 670 static int
 671 vsp1_video_queue_setup(struct vb2_queue *vq,
 672                        unsigned int *nbuffers, unsigned int *nplanes,
 673                        unsigned int sizes[], struct device *alloc_devs[])
 674 {
 675         struct vsp1_video *video = vb2_get_drv_priv(vq);
 676         const struct v4l2_pix_format_mplane *format = &video->rwpf->format;
 677         unsigned int i;
 678
 679         if (*nplanes) {
 680                 if (*nplanes != format->num_planes)
 681                         return -EINVAL;
 682
 683                 for (i = 0; i < *nplanes; i++)
 684                         if (sizes[i] < format->plane_fmt[i].sizeimage)
 685                                 return -EINVAL;
 686                 return 0;
 687         }
 688
 689         *nplanes = format->num_planes;
 690
 691         for (i = 0; i < format->num_planes; ++i)
 692                 sizes[i] = format->plane_fmt[i].sizeimage;
 693
 694         return 0;
 695 }
 696
 697 static int vsp1_video_buffer_prepare(struct vb2_buffer *vb)
 698 {
 699         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 700         struct vsp1_video *video = vb2_get_drv_priv(vb->vb2_queue);
 701         struct vsp1_vb2_buffer *buf = to_vsp1_vb2_buffer(vbuf);
 702         const struct v4l2_pix_format_mplane *format = &video->rwpf->format;
 703         unsigned int i;
 704
 705         if (vb->num_planes < format->num_planes)
 706                 return -EINVAL;
 707
 708         for (i = 0; i < vb->num_planes; ++i) {
 709                 buf->mem.addr[i] = vb2_dma_contig_plane_dma_addr(vb, i);
 710
 711                 if (vb2_plane_size(vb, i) < format->plane_fmt[i].sizeimage)
 712                         return -EINVAL;
 713         }
 714
 715         for ( ; i < 3; ++i)
 716                 buf->mem.addr[i] = 0;
 717
 718         return 0;
 719 }
 720
 721 static void vsp1_video_buffer_queue(struct vb2_buffer *vb)
 722 {
 723         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 724         struct vsp1_video *video = vb2_get_drv_priv(vb->vb2_queue);
 725         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 726         struct vsp1_vb2_buffer *buf = to_vsp1_vb2_buffer(vbuf);
 727         unsigned long flags;
 728         bool empty;
 729
 730         spin_lock_irqsave(&video->irqlock, flags);
 731         empty = list_empty(&video->irqqueue);
 732         list_add_tail(&buf->queue, &video->irqqueue);
 733         spin_unlock_irqrestore(&video->irqlock, flags);
 734
 735         if (!empty)
 736                 return;
 737
 738         spin_lock_irqsave(&pipe->irqlock, flags);
 739
 740         video->rwpf->mem = buf->mem;
 741         pipe->buffers_ready |= 1 << video->pipe_index;
 742
 743         if (vb2_is_streaming(&video->queue) &&
 744             vsp1_pipeline_ready(pipe))
 745                 vsp1_video_pipeline_run(pipe);
 746
 747         spin_unlock_irqrestore(&pipe->irqlock, flags);
 748 }
 749
 750 static int vsp1_video_setup_pipeline(struct vsp1_pipeline *pipe)
 751 {
 752         struct vsp1_entity *entity;
 753
 754         /* Determine this pipelines sizes for image partitioning support. */
 755         vsp1_video_pipeline_setup_partitions(pipe);
 756
 757         /* Prepare the display list. */
 758         pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
 759         if (!pipe->dl)
 760                 return -ENOMEM;
 761
 762         if (pipe->uds) {
 763                 struct vsp1_uds *uds = to_uds(&pipe->uds->subdev);
 764
 765                 /* If a BRU is present in the pipeline before the UDS, the alpha
 766                  * component doesn't need to be scaled as the BRU output alpha
 767                  * value is fixed to 255. Otherwise we need to scale the alpha
 768                  * component only when available at the input RPF.
 769                  */
 770                 if (pipe->uds_input->type == VSP1_ENTITY_BRU) {
 771                         uds->scale_alpha = false;
 772                 } else {
 773                         struct vsp1_rwpf *rpf =
 774                                 to_rwpf(&pipe->uds_input->subdev);
 775
 776                         uds->scale_alpha = rpf->fmtinfo->alpha;
 777                 }
 778         }
 779
 780         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 781                 vsp1_entity_route_setup(entity, pipe->dl);
 782
 783                 if (entity->ops->configure)
 784                         entity->ops->configure(entity, pipe, pipe->dl,
 785                                                VSP1_ENTITY_PARAMS_INIT);
 786         }
 787
 788         return 0;
 789 }
 790
 791 static int vsp1_video_start_streaming(struct vb2_queue *vq, unsigned int count)
 792 {
 793         struct vsp1_video *video = vb2_get_drv_priv(vq);
 794         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 795         bool start_pipeline = false;
 796         unsigned long flags;
 797         int ret;
 798
 799         mutex_lock(&pipe->lock);
 800         if (pipe->stream_count == pipe->num_inputs) {
 801                 ret = vsp1_video_setup_pipeline(pipe);
 802                 if (ret < 0) {
 803                         mutex_unlock(&pipe->lock);
 804                         return ret;
 805                 }
 806
 807                 start_pipeline = true;
 808         }
 809
 810         pipe->stream_count++;
 811         mutex_unlock(&pipe->lock);
 812
 813         /*
 814          * vsp1_pipeline_ready() is not sufficient to establish that all streams
 815          * are prepared and the pipeline is configured, as multiple streams
 816          * can race through streamon with buffers already queued; Therefore we
 817          * don't even attempt to start the pipeline until the last stream has
 818          * called through here.
 819          */
 820         if (!start_pipeline)
 821                 return 0;
 822
 823         spin_lock_irqsave(&pipe->irqlock, flags);
 824         if (vsp1_pipeline_ready(pipe))
 825                 vsp1_video_pipeline_run(pipe);
 826         spin_unlock_irqrestore(&pipe->irqlock, flags);
 827
 828         return 0;
 829 }
 830
 831 static void vsp1_video_stop_streaming(struct vb2_queue *vq)
 832 {
 833         struct vsp1_video *video = vb2_get_drv_priv(vq);
 834         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 835         struct vsp1_vb2_buffer *buffer;
 836         unsigned long flags;
 837         int ret;
 838
 839         /*
 840          * Clear the buffers ready flag to make sure the device won't be started
 841          * by a QBUF on the video node on the other side of the pipeline.
 842          */
 843         spin_lock_irqsave(&video->irqlock, flags);
 844         pipe->buffers_ready &= ~(1 << video->pipe_index);
 845         spin_unlock_irqrestore(&video->irqlock, flags);
 846
 847         mutex_lock(&pipe->lock);
 848         if (--pipe->stream_count == pipe->num_inputs) {
 849                 /* Stop the pipeline. */
 850                 ret = vsp1_pipeline_stop(pipe);
 851                 if (ret == -ETIMEDOUT)
 852                         dev_err(video->vsp1->dev, "pipeline stop timeout\n");
 853
 854                 vsp1_dl_list_put(pipe->dl);
 855                 pipe->dl = NULL;
 856         }
 857         mutex_unlock(&pipe->lock);
 858
 859         media_entity_pipeline_stop(&video->video.entity);
 860         vsp1_video_pipeline_put(pipe);
 861
 862         /* Remove all buffers from the IRQ queue. */
 863         spin_lock_irqsave(&video->irqlock, flags);
 864         list_for_each_entry(buffer, &video->irqqueue, queue)
 865                 vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR);
 866         INIT_LIST_HEAD(&video->irqqueue);
 867         spin_unlock_irqrestore(&video->irqlock, flags);
 868 }
 869
 870 static const struct vb2_ops vsp1_video_queue_qops = {
 871         .queue_setup = vsp1_video_queue_setup,
 872         .buf_prepare = vsp1_video_buffer_prepare,
 873         .buf_queue = vsp1_video_buffer_queue,
 874         .wait_prepare = vb2_ops_wait_prepare,
 875         .wait_finish = vb2_ops_wait_finish,
 876         .start_streaming = vsp1_video_start_streaming,
 877         .stop_streaming = vsp1_video_stop_streaming,
 878 };
 879
 880 /* -----------------------------------------------------------------------------
 881  * V4L2 ioctls
 882  */
 883
 884 static int
 885 vsp1_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 886 {
 887         struct v4l2_fh *vfh = file->private_data;
 888         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 889
 890         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 891                           | V4L2_CAP_VIDEO_CAPTURE_MPLANE
 892                           | V4L2_CAP_VIDEO_OUTPUT_MPLANE;
 893
 894         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
 895                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE
 896                                  | V4L2_CAP_STREAMING;
 897         else
 898                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT_MPLANE
 899                                  | V4L2_CAP_STREAMING;
 900
 901         strlcpy(cap->driver, "vsp1", sizeof(cap->driver));
 902         strlcpy(cap->card, video->video.name, sizeof(cap->card));
 903         snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
 904                  dev_name(video->vsp1->dev));
 905
 906         return 0;
 907 }
 908
 909 static int
 910 vsp1_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
 911 {
 912         struct v4l2_fh *vfh = file->private_data;
 913         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 914
 915         if (format->type != video->queue.type)
 916                 return -EINVAL;
 917
 918         mutex_lock(&video->lock);
 919         format->fmt.pix_mp = video->rwpf->format;
 920         mutex_unlock(&video->lock);
 921
 922         return 0;
 923 }
 924
 925 static int
 926 vsp1_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
 927 {
 928         struct v4l2_fh *vfh = file->private_data;
 929         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 930
 931         if (format->type != video->queue.type)
 932                 return -EINVAL;
 933
 934         return __vsp1_video_try_format(video, &format->fmt.pix_mp, NULL);
 935 }
 936
 937 static int
 938 vsp1_video_set_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         const struct vsp1_format_info *info;
 943         int ret;
 944
 945         if (format->type != video->queue.type)
 946                 return -EINVAL;
 947
 948         ret = __vsp1_video_try_format(video, &format->fmt.pix_mp, &info);
 949         if (ret < 0)
 950                 return ret;
 951
 952         mutex_lock(&video->lock);
 953
 954         if (vb2_is_busy(&video->queue)) {
 955                 ret = -EBUSY;
 956                 goto done;
 957         }
 958
 959         video->rwpf->format = format->fmt.pix_mp;
 960         video->rwpf->fmtinfo = info;
 961
 962 done:
 963         mutex_unlock(&video->lock);
 964         return ret;
 965 }
 966
 967 static int
 968 vsp1_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 969 {
 970         struct v4l2_fh *vfh = file->private_data;
 971         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 972         struct media_device *mdev = &video->vsp1->media_dev;
 973         struct vsp1_pipeline *pipe;
 974         int ret;
 975
 976         if (video->queue.owner && video->queue.owner != file->private_data)
 977                 return -EBUSY;
 978
 979         /* Get a pipeline for the video node and start streaming on it. No link
 980          * touching an entity in the pipeline can be activated or deactivated
 981          * once streaming is started.
 982          */
 983         mutex_lock(&mdev->graph_mutex);
 984
 985         pipe = vsp1_video_pipeline_get(video);
 986         if (IS_ERR(pipe)) {
 987                 mutex_unlock(&mdev->graph_mutex);
 988                 return PTR_ERR(pipe);
 989         }
 990
 991         ret = __media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
 992         if (ret < 0) {
 993                 mutex_unlock(&mdev->graph_mutex);
 994                 goto err_pipe;
 995         }
 996
 997         mutex_unlock(&mdev->graph_mutex);
 998
 999         /* Verify that the configured format matches the output of the connected
1000          * subdev.
1001          */
1002         ret = vsp1_video_verify_format(video);
1003         if (ret < 0)
1004                 goto err_stop;
1005
1006         /* Start the queue. */
1007         ret = vb2_streamon(&video->queue, type);
1008         if (ret < 0)
1009                 goto err_stop;
1010
1011         return 0;
1012
1013 err_stop:
1014         media_entity_pipeline_stop(&video->video.entity);
1015 err_pipe:
1016         vsp1_video_pipeline_put(pipe);
1017         return ret;
1018 }
1019
1020 static const struct v4l2_ioctl_ops vsp1_video_ioctl_ops = {
1021         .vidioc_querycap                = vsp1_video_querycap,
1022         .vidioc_g_fmt_vid_cap_mplane    = vsp1_video_get_format,
1023         .vidioc_s_fmt_vid_cap_mplane    = vsp1_video_set_format,
1024         .vidioc_try_fmt_vid_cap_mplane  = vsp1_video_try_format,
1025         .vidioc_g_fmt_vid_out_mplane    = vsp1_video_get_format,
1026         .vidioc_s_fmt_vid_out_mplane    = vsp1_video_set_format,
1027         .vidioc_try_fmt_vid_out_mplane  = vsp1_video_try_format,
1028         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
1029         .vidioc_querybuf                = vb2_ioctl_querybuf,
1030         .vidioc_qbuf                    = vb2_ioctl_qbuf,
1031         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
1032         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
1033         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
1034         .vidioc_streamon                = vsp1_video_streamon,
1035         .vidioc_streamoff               = vb2_ioctl_streamoff,
1036 };
1037
1038 /* -----------------------------------------------------------------------------
1039  * V4L2 File Operations
1040  */
1041
1042 static int vsp1_video_open(struct file *file)
1043 {
1044         struct vsp1_video *video = video_drvdata(file);
1045         struct v4l2_fh *vfh;
1046         int ret = 0;
1047
1048         vfh = kzalloc(sizeof(*vfh), GFP_KERNEL);
1049         if (vfh == NULL)
1050                 return -ENOMEM;
1051
1052         v4l2_fh_init(vfh, &video->video);
1053         v4l2_fh_add(vfh);
1054
1055         file->private_data = vfh;
1056
1057         ret = vsp1_device_get(video->vsp1);
1058         if (ret < 0) {
1059                 v4l2_fh_del(vfh);
1060                 kfree(vfh);
1061         }
1062
1063         return ret;
1064 }
1065
1066 static int vsp1_video_release(struct file *file)
1067 {
1068         struct vsp1_video *video = video_drvdata(file);
1069         struct v4l2_fh *vfh = file->private_data;
1070
1071         mutex_lock(&video->lock);
1072         if (video->queue.owner == vfh) {
1073                 vb2_queue_release(&video->queue);
1074                 video->queue.owner = NULL;
1075         }
1076         mutex_unlock(&video->lock);
1077
1078         vsp1_device_put(video->vsp1);
1079
1080         v4l2_fh_release(file);
1081
1082         file->private_data = NULL;
1083
1084         return 0;
1085 }
1086
1087 static const struct v4l2_file_operations vsp1_video_fops = {
1088         .owner = THIS_MODULE,
1089         .unlocked_ioctl = video_ioctl2,
1090         .open = vsp1_video_open,
1091         .release = vsp1_video_release,
1092         .poll = vb2_fop_poll,
1093         .mmap = vb2_fop_mmap,
1094 };
1095
1096 /* -----------------------------------------------------------------------------
1097  * Initialization and Cleanup
1098  */
1099
1100 struct vsp1_video *vsp1_video_create(struct vsp1_device *vsp1,
1101                                      struct vsp1_rwpf *rwpf)
1102 {
1103         struct vsp1_video *video;
1104         const char *direction;
1105         int ret;
1106
1107         video = devm_kzalloc(vsp1->dev, sizeof(*video), GFP_KERNEL);
1108         if (!video)
1109                 return ERR_PTR(-ENOMEM);
1110
1111         rwpf->video = video;
1112
1113         video->vsp1 = vsp1;
1114         video->rwpf = rwpf;
1115
1116         if (rwpf->entity.type == VSP1_ENTITY_RPF) {
1117                 direction = "input";
1118                 video->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
1119                 video->pad.flags = MEDIA_PAD_FL_SOURCE;
1120                 video->video.vfl_dir = VFL_DIR_TX;
1121         } else {
1122                 direction = "output";
1123                 video->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
1124                 video->pad.flags = MEDIA_PAD_FL_SINK;
1125                 video->video.vfl_dir = VFL_DIR_RX;
1126         }
1127
1128         mutex_init(&video->lock);
1129         spin_lock_init(&video->irqlock);
1130         INIT_LIST_HEAD(&video->irqqueue);
1131
1132         /* Initialize the media entity... */
1133         ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
1134         if (ret < 0)
1135                 return ERR_PTR(ret);
1136
1137         /* ... and the format ... */
1138         rwpf->format.pixelformat = VSP1_VIDEO_DEF_FORMAT;
1139         rwpf->format.width = VSP1_VIDEO_DEF_WIDTH;
1140         rwpf->format.height = VSP1_VIDEO_DEF_HEIGHT;
1141         __vsp1_video_try_format(video, &rwpf->format, &rwpf->fmtinfo);
1142
1143         /* ... and the video node... */
1144         video->video.v4l2_dev = &video->vsp1->v4l2_dev;
1145         video->video.fops = &vsp1_video_fops;
1146         snprintf(video->video.name, sizeof(video->video.name), "%s %s",
1147                  rwpf->entity.subdev.name, direction);
1148         video->video.vfl_type = VFL_TYPE_GRABBER;
1149         video->video.release = video_device_release_empty;
1150         video->video.ioctl_ops = &vsp1_video_ioctl_ops;
1151
1152         video_set_drvdata(&video->video, video);
1153
1154         video->queue.type = video->type;
1155         video->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
1156         video->queue.lock = &video->lock;
1157         video->queue.drv_priv = video;
1158         video->queue.buf_struct_size = sizeof(struct vsp1_vb2_buffer);
1159         video->queue.ops = &vsp1_video_queue_qops;
1160         video->queue.mem_ops = &vb2_dma_contig_memops;
1161         video->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
1162         video->queue.dev = video->vsp1->dev;
1163         ret = vb2_queue_init(&video->queue);
1164         if (ret < 0) {
1165                 dev_err(video->vsp1->dev, "failed to initialize vb2 queue\n");
1166                 goto error;
1167         }
1168
1169         /* ... and register the video device. */
1170         video->video.queue = &video->queue;
1171         ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1172         if (ret < 0) {
1173                 dev_err(video->vsp1->dev, "failed to register video device\n");
1174                 goto error;
1175         }
1176
1177         return video;
1178
1179 error:
1180         vsp1_video_cleanup(video);
1181         return ERR_PTR(ret);
1182 }
1183
1184 void vsp1_video_cleanup(struct vsp1_video *video)
1185 {
1186         if (video_is_registered(&video->video))
1187                 video_unregister_device(&video->video);
1188
1189         media_entity_cleanup(&video->video.entity);
1190 }