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_hgt.h"
  36 #include "vsp1_pipe.h"
  37 #include "vsp1_rwpf.h"
  38 #include "vsp1_uds.h"
  39 #include "vsp1_video.h"
  40
  41 #define VSP1_VIDEO_DEF_FORMAT           V4L2_PIX_FMT_YUYV
  42 #define VSP1_VIDEO_DEF_WIDTH            1024
  43 #define VSP1_VIDEO_DEF_HEIGHT           768
  44
  45 #define VSP1_VIDEO_MIN_WIDTH            2U
  46 #define VSP1_VIDEO_MAX_WIDTH            8190U
  47 #define VSP1_VIDEO_MIN_HEIGHT           2U
  48 #define VSP1_VIDEO_MAX_HEIGHT           8190U
  49
  50 /* -----------------------------------------------------------------------------
  51  * Helper functions
  52  */
  53
  54 static struct v4l2_subdev *
  55 vsp1_video_remote_subdev(struct media_pad *local, u32 *pad)
  56 {
  57         struct media_pad *remote;
  58
  59         remote = media_entity_remote_pad(local);
  60         if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
  61                 return NULL;
  62
  63         if (pad)
  64                 *pad = remote->index;
  65
  66         return media_entity_to_v4l2_subdev(remote->entity);
  67 }
  68
  69 static int vsp1_video_verify_format(struct vsp1_video *video)
  70 {
  71         struct v4l2_subdev_format fmt;
  72         struct v4l2_subdev *subdev;
  73         int ret;
  74
  75         subdev = vsp1_video_remote_subdev(&video->pad, &fmt.pad);
  76         if (subdev == NULL)
  77                 return -EINVAL;
  78
  79         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
  80         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
  81         if (ret < 0)
  82                 return ret == -ENOIOCTLCMD ? -EINVAL : ret;
  83
  84         if (video->rwpf->fmtinfo->mbus != fmt.format.code ||
  85             video->rwpf->format.height != fmt.format.height ||
  86             video->rwpf->format.width != fmt.format.width)
  87                 return -EINVAL;
  88
  89         return 0;
  90 }
  91
  92 static int __vsp1_video_try_format(struct vsp1_video *video,
  93                                    struct v4l2_pix_format_mplane *pix,
  94                                    const struct vsp1_format_info **fmtinfo)
  95 {
  96         static const u32 xrgb_formats[][2] = {
  97                 { V4L2_PIX_FMT_RGB444, V4L2_PIX_FMT_XRGB444 },
  98                 { V4L2_PIX_FMT_RGB555, V4L2_PIX_FMT_XRGB555 },
  99                 { V4L2_PIX_FMT_BGR32, V4L2_PIX_FMT_XBGR32 },
 100                 { V4L2_PIX_FMT_RGB32, V4L2_PIX_FMT_XRGB32 },
 101         };
 102
 103         const struct vsp1_format_info *info;
 104         unsigned int width = pix->width;
 105         unsigned int height = pix->height;
 106         unsigned int i;
 107
 108         /*
 109          * Backward compatibility: replace deprecated RGB formats by their XRGB
 110          * equivalent. This selects the format older userspace applications want
 111          * while still exposing the new format.
 112          */
 113         for (i = 0; i < ARRAY_SIZE(xrgb_formats); ++i) {
 114                 if (xrgb_formats[i][0] == pix->pixelformat) {
 115                         pix->pixelformat = xrgb_formats[i][1];
 116                         break;
 117                 }
 118         }
 119
 120         /*
 121          * Retrieve format information and select the default format if the
 122          * requested format isn't supported.
 123          */
 124         info = vsp1_get_format_info(video->vsp1, pix->pixelformat);
 125         if (info == NULL)
 126                 info = vsp1_get_format_info(video->vsp1, VSP1_VIDEO_DEF_FORMAT);
 127
 128         pix->pixelformat = info->fourcc;
 129         pix->colorspace = V4L2_COLORSPACE_SRGB;
 130         pix->field = V4L2_FIELD_NONE;
 131
 132         if (info->fourcc == V4L2_PIX_FMT_HSV24 ||
 133             info->fourcc == V4L2_PIX_FMT_HSV32)
 134                 pix->hsv_enc = V4L2_HSV_ENC_256;
 135
 136         memset(pix->reserved, 0, sizeof(pix->reserved));
 137
 138         /* Align the width and height for YUV 4:2:2 and 4:2:0 formats. */
 139         width = round_down(width, info->hsub);
 140         height = round_down(height, info->vsub);
 141
 142         /* Clamp the width and height. */
 143         pix->width = clamp(width, VSP1_VIDEO_MIN_WIDTH, VSP1_VIDEO_MAX_WIDTH);
 144         pix->height = clamp(height, VSP1_VIDEO_MIN_HEIGHT,
 145                             VSP1_VIDEO_MAX_HEIGHT);
 146
 147         /*
 148          * Compute and clamp the stride and image size. While not documented in
 149          * the datasheet, strides not aligned to a multiple of 128 bytes result
 150          * in image corruption.
 151          */
 152         for (i = 0; i < min(info->planes, 2U); ++i) {
 153                 unsigned int hsub = i > 0 ? info->hsub : 1;
 154                 unsigned int vsub = i > 0 ? info->vsub : 1;
 155                 unsigned int align = 128;
 156                 unsigned int bpl;
 157
 158                 bpl = clamp_t(unsigned int, pix->plane_fmt[i].bytesperline,
 159                               pix->width / hsub * info->bpp[i] / 8,
 160                               round_down(65535U, align));
 161
 162                 pix->plane_fmt[i].bytesperline = round_up(bpl, align);
 163                 pix->plane_fmt[i].sizeimage = pix->plane_fmt[i].bytesperline
 164                                             * pix->height / vsub;
 165         }
 166
 167         if (info->planes == 3) {
 168                 /* The second and third planes must have the same stride. */
 169                 pix->plane_fmt[2].bytesperline = pix->plane_fmt[1].bytesperline;
 170                 pix->plane_fmt[2].sizeimage = pix->plane_fmt[1].sizeimage;
 171         }
 172
 173         pix->num_planes = info->planes;
 174
 175         if (fmtinfo)
 176                 *fmtinfo = info;
 177
 178         return 0;
 179 }
 180
 181 /* -----------------------------------------------------------------------------
 182  * VSP1 Partition Algorithm support
 183  */
 184
 185 /**
 186  * vsp1_video_calculate_partition - Calculate the active partition output window
 187  *
 188  * @pipe: the pipeline
 189  * @partition: partition that will hold the calculated values
 190  * @div_size: pre-determined maximum partition division size
 191  * @index: partition index
 192  */
 193 static void vsp1_video_calculate_partition(struct vsp1_pipeline *pipe,
 194                                            struct vsp1_partition *partition,
 195                                            unsigned int div_size,
 196                                            unsigned int index)
 197 {
 198         const struct v4l2_mbus_framefmt *format;
 199         struct vsp1_partition_window window;
 200         unsigned int modulus;
 201
 202         /*
 203          * Partitions are computed on the size before rotation, use the format
 204          * at the WPF sink.
 205          */
 206         format = vsp1_entity_get_pad_format(&pipe->output->entity,
 207                                             pipe->output->entity.config,
 208                                             RWPF_PAD_SINK);
 209
 210         /* A single partition simply processes the output size in full. */
 211         if (pipe->partitions <= 1) {
 212                 window.left = 0;
 213                 window.width = format->width;
 214
 215                 vsp1_pipeline_propagate_partition(pipe, partition, index,
 216                                                   &window);
 217                 return;
 218         }
 219
 220         /* Initialise the partition with sane starting conditions. */
 221         window.left = index * div_size;
 222         window.width = div_size;
 223
 224         modulus = format->width % div_size;
 225
 226         /*
 227          * We need to prevent the last partition from being smaller than the
 228          * *minimum* width of the hardware capabilities.
 229          *
 230          * If the modulus is less than half of the partition size,
 231          * the penultimate partition is reduced to half, which is added
 232          * to the final partition: |1234|1234|1234|12|341|
 233          * to prevents this:       |1234|1234|1234|1234|1|.
 234          */
 235         if (modulus) {
 236                 /*
 237                  * pipe->partitions is 1 based, whilst index is a 0 based index.
 238                  * Normalise this locally.
 239                  */
 240                 unsigned int partitions = pipe->partitions - 1;
 241
 242                 if (modulus < div_size / 2) {
 243                         if (index == partitions - 1) {
 244                                 /* Halve the penultimate partition. */
 245                                 window.width = div_size / 2;
 246                         } else if (index == partitions) {
 247                                 /* Increase the final partition. */
 248                                 window.width = (div_size / 2) + modulus;
 249                                 window.left -= div_size / 2;
 250                         }
 251                 } else if (index == partitions) {
 252                         window.width = modulus;
 253                 }
 254         }
 255
 256         vsp1_pipeline_propagate_partition(pipe, partition, index, &window);
 257 }
 258
 259 static int vsp1_video_pipeline_setup_partitions(struct vsp1_pipeline *pipe)
 260 {
 261         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 262         const struct v4l2_mbus_framefmt *format;
 263         struct vsp1_entity *entity;
 264         unsigned int div_size;
 265         unsigned int i;
 266
 267         /*
 268          * Partitions are computed on the size before rotation, use the format
 269          * at the WPF sink.
 270          */
 271         format = vsp1_entity_get_pad_format(&pipe->output->entity,
 272                                             pipe->output->entity.config,
 273                                             RWPF_PAD_SINK);
 274         div_size = format->width;
 275
 276         /*
 277          * Only Gen3 hardware requires image partitioning, Gen2 will operate
 278          * with a single partition that covers the whole output.
 279          */
 280         if (vsp1->info->gen == 3) {
 281                 list_for_each_entry(entity, &pipe->entities, list_pipe) {
 282                         unsigned int entity_max;
 283
 284                         if (!entity->ops->max_width)
 285                                 continue;
 286
 287                         entity_max = entity->ops->max_width(entity, pipe);
 288                         if (entity_max)
 289                                 div_size = min(div_size, entity_max);
 290                 }
 291         }
 292
 293         pipe->partitions = DIV_ROUND_UP(format->width, div_size);
 294         pipe->part_table = kcalloc(pipe->partitions, sizeof(*pipe->part_table),
 295                                    GFP_KERNEL);
 296         if (!pipe->part_table)
 297                 return -ENOMEM;
 298
 299         for (i = 0; i < pipe->partitions; ++i)
 300                 vsp1_video_calculate_partition(pipe, &pipe->part_table[i],
 301                                                div_size, i);
 302
 303         return 0;
 304 }
 305
 306 /* -----------------------------------------------------------------------------
 307  * Pipeline Management
 308  */
 309
 310 /*
 311  * vsp1_video_complete_buffer - Complete the current buffer
 312  * @video: the video node
 313  *
 314  * This function completes the current buffer by filling its sequence number,
 315  * time stamp and payload size, and hands it back to the videobuf core.
 316  *
 317  * When operating in DU output mode (deep pipeline to the DU through the LIF),
 318  * the VSP1 needs to constantly supply frames to the display. In that case, if
 319  * no other buffer is queued, reuse the one that has just been processed instead
 320  * of handing it back to the videobuf core.
 321  *
 322  * Return the next queued buffer or NULL if the queue is empty.
 323  */
 324 static struct vsp1_vb2_buffer *
 325 vsp1_video_complete_buffer(struct vsp1_video *video)
 326 {
 327         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 328         struct vsp1_vb2_buffer *next = NULL;
 329         struct vsp1_vb2_buffer *done;
 330         unsigned long flags;
 331         unsigned int i;
 332
 333         spin_lock_irqsave(&video->irqlock, flags);
 334
 335         if (list_empty(&video->irqqueue)) {
 336                 spin_unlock_irqrestore(&video->irqlock, flags);
 337                 return NULL;
 338         }
 339
 340         done = list_first_entry(&video->irqqueue,
 341                                 struct vsp1_vb2_buffer, queue);
 342
 343         /* In DU output mode reuse the buffer if the list is singular. */
 344         if (pipe->lif && list_is_singular(&video->irqqueue)) {
 345                 spin_unlock_irqrestore(&video->irqlock, flags);
 346                 return done;
 347         }
 348
 349         list_del(&done->queue);
 350
 351         if (!list_empty(&video->irqqueue))
 352                 next = list_first_entry(&video->irqqueue,
 353                                         struct vsp1_vb2_buffer, queue);
 354
 355         spin_unlock_irqrestore(&video->irqlock, flags);
 356
 357         done->buf.sequence = pipe->sequence;
 358         done->buf.vb2_buf.timestamp = ktime_get_ns();
 359         for (i = 0; i < done->buf.vb2_buf.num_planes; ++i)
 360                 vb2_set_plane_payload(&done->buf.vb2_buf, i,
 361                                       vb2_plane_size(&done->buf.vb2_buf, i));
 362         vb2_buffer_done(&done->buf.vb2_buf, VB2_BUF_STATE_DONE);
 363
 364         return next;
 365 }
 366
 367 static void vsp1_video_frame_end(struct vsp1_pipeline *pipe,
 368                                  struct vsp1_rwpf *rwpf)
 369 {
 370         struct vsp1_video *video = rwpf->video;
 371         struct vsp1_vb2_buffer *buf;
 372
 373         buf = vsp1_video_complete_buffer(video);
 374         if (buf == NULL)
 375                 return;
 376
 377         video->rwpf->mem = buf->mem;
 378         pipe->buffers_ready |= 1 << video->pipe_index;
 379 }
 380
 381 static void vsp1_video_pipeline_run_partition(struct vsp1_pipeline *pipe,
 382                                               struct vsp1_dl_list *dl,
 383                                               unsigned int partition)
 384 {
 385         struct vsp1_entity *entity;
 386
 387         pipe->partition = &pipe->part_table[partition];
 388
 389         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 390                 if (entity->ops->configure)
 391                         entity->ops->configure(entity, pipe, dl,
 392                                                VSP1_ENTITY_PARAMS_PARTITION);
 393         }
 394 }
 395
 396 static void vsp1_video_pipeline_run(struct vsp1_pipeline *pipe)
 397 {
 398         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 399         struct vsp1_entity *entity;
 400         unsigned int partition;
 401
 402         if (!pipe->dl)
 403                 pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
 404
 405         /*
 406          * Start with the runtime parameters as the configure operation can
 407          * compute/cache information needed when configuring partitions. This
 408          * is the case with flipping in the WPF.
 409          */
 410         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 411                 if (entity->ops->configure)
 412                         entity->ops->configure(entity, pipe, pipe->dl,
 413                                                VSP1_ENTITY_PARAMS_RUNTIME);
 414         }
 415
 416         /* Run the first partition */
 417         vsp1_video_pipeline_run_partition(pipe, pipe->dl, 0);
 418
 419         /* Process consecutive partitions as necessary */
 420         for (partition = 1; partition < pipe->partitions; ++partition) {
 421                 struct vsp1_dl_list *dl;
 422
 423                 dl = vsp1_dl_list_get(pipe->output->dlm);
 424
 425                 /*
 426                  * An incomplete chain will still function, but output only
 427                  * the partitions that had a dl available. The frame end
 428                  * interrupt will be marked on the last dl in the chain.
 429                  */
 430                 if (!dl) {
 431                         dev_err(vsp1->dev, "Failed to obtain a dl list. Frame will be incomplete\n");
 432                         break;
 433                 }
 434
 435                 vsp1_video_pipeline_run_partition(pipe, dl, partition);
 436                 vsp1_dl_list_add_chain(pipe->dl, dl);
 437         }
 438
 439         /* Complete, and commit the head display list. */
 440         vsp1_dl_list_commit(pipe->dl);
 441         pipe->dl = NULL;
 442
 443         vsp1_pipeline_run(pipe);
 444 }
 445
 446 static void vsp1_video_pipeline_frame_end(struct vsp1_pipeline *pipe,
 447                                           bool completed)
 448 {
 449         struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
 450         enum vsp1_pipeline_state state;
 451         unsigned long flags;
 452         unsigned int i;
 453
 454         /* M2M Pipelines should never call here with an incomplete frame. */
 455         WARN_ON_ONCE(!completed);
 456
 457         spin_lock_irqsave(&pipe->irqlock, flags);
 458
 459         /* Complete buffers on all video nodes. */
 460         for (i = 0; i < vsp1->info->rpf_count; ++i) {
 461                 if (!pipe->inputs[i])
 462                         continue;
 463
 464                 vsp1_video_frame_end(pipe, pipe->inputs[i]);
 465         }
 466
 467         vsp1_video_frame_end(pipe, pipe->output);
 468
 469         state = pipe->state;
 470         pipe->state = VSP1_PIPELINE_STOPPED;
 471
 472         /*
 473          * If a stop has been requested, mark the pipeline as stopped and
 474          * return. Otherwise restart the pipeline if ready.
 475          */
 476         if (state == VSP1_PIPELINE_STOPPING)
 477                 wake_up(&pipe->wq);
 478         else if (vsp1_pipeline_ready(pipe))
 479                 vsp1_video_pipeline_run(pipe);
 480
 481         spin_unlock_irqrestore(&pipe->irqlock, flags);
 482 }
 483
 484 static int vsp1_video_pipeline_build_branch(struct vsp1_pipeline *pipe,
 485                                             struct vsp1_rwpf *input,
 486                                             struct vsp1_rwpf *output)
 487 {
 488         struct media_entity_enum ent_enum;
 489         struct vsp1_entity *entity;
 490         struct media_pad *pad;
 491         struct vsp1_bru *bru = NULL;
 492         int ret;
 493
 494         ret = media_entity_enum_init(&ent_enum, &input->entity.vsp1->media_dev);
 495         if (ret < 0)
 496                 return ret;
 497
 498         /*
 499          * The main data path doesn't include the HGO or HGT, use
 500          * vsp1_entity_remote_pad() to traverse the graph.
 501          */
 502
 503         pad = vsp1_entity_remote_pad(&input->entity.pads[RWPF_PAD_SOURCE]);
 504
 505         while (1) {
 506                 if (pad == NULL) {
 507                         ret = -EPIPE;
 508                         goto out;
 509                 }
 510
 511                 /* We've reached a video node, that shouldn't have happened. */
 512                 if (!is_media_entity_v4l2_subdev(pad->entity)) {
 513                         ret = -EPIPE;
 514                         goto out;
 515                 }
 516
 517                 entity = to_vsp1_entity(
 518                         media_entity_to_v4l2_subdev(pad->entity));
 519
 520                 /*
 521                  * A BRU or BRS is present in the pipeline, store its input pad
 522                  * number in the input RPF for use when configuring the RPF.
 523                  */
 524                 if (entity->type == VSP1_ENTITY_BRU ||
 525                     entity->type == VSP1_ENTITY_BRS) {
 526                         /* BRU and BRS can't be chained. */
 527                         if (bru) {
 528                                 ret = -EPIPE;
 529                                 goto out;
 530                         }
 531
 532                         bru = to_bru(&entity->subdev);
 533                         bru->inputs[pad->index].rpf = input;
 534                         input->bru_input = pad->index;
 535                 }
 536
 537                 /* We've reached the WPF, we're done. */
 538                 if (entity->type == VSP1_ENTITY_WPF)
 539                         break;
 540
 541                 /* Ensure the branch has no loop. */
 542                 if (media_entity_enum_test_and_set(&ent_enum,
 543                                                    &entity->subdev.entity)) {
 544                         ret = -EPIPE;
 545                         goto out;
 546                 }
 547
 548                 /* UDS can't be chained. */
 549                 if (entity->type == VSP1_ENTITY_UDS) {
 550                         if (pipe->uds) {
 551                                 ret = -EPIPE;
 552                                 goto out;
 553                         }
 554
 555                         pipe->uds = entity;
 556                         pipe->uds_input = bru ? &bru->entity : &input->entity;
 557                 }
 558
 559                 /* Follow the source link, ignoring any HGO or HGT. */
 560                 pad = &entity->pads[entity->source_pad];
 561                 pad = vsp1_entity_remote_pad(pad);
 562         }
 563
 564         /* The last entity must be the output WPF. */
 565         if (entity != &output->entity)
 566                 ret = -EPIPE;
 567
 568 out:
 569         media_entity_enum_cleanup(&ent_enum);
 570
 571         return ret;
 572 }
 573
 574 static int vsp1_video_pipeline_build(struct vsp1_pipeline *pipe,
 575                                      struct vsp1_video *video)
 576 {
 577         struct media_graph graph;
 578         struct media_entity *entity = &video->video.entity;
 579         struct media_device *mdev = entity->graph_obj.mdev;
 580         unsigned int i;
 581         int ret;
 582
 583         /* Walk the graph to locate the entities and video nodes. */
 584         ret = media_graph_walk_init(&graph, mdev);
 585         if (ret)
 586                 return ret;
 587
 588         media_graph_walk_start(&graph, entity);
 589
 590         while ((entity = media_graph_walk_next(&graph))) {
 591                 struct v4l2_subdev *subdev;
 592                 struct vsp1_rwpf *rwpf;
 593                 struct vsp1_entity *e;
 594
 595                 if (!is_media_entity_v4l2_subdev(entity))
 596                         continue;
 597
 598                 subdev = media_entity_to_v4l2_subdev(entity);
 599                 e = to_vsp1_entity(subdev);
 600                 list_add_tail(&e->list_pipe, &pipe->entities);
 601
 602                 switch (e->type) {
 603                 case VSP1_ENTITY_RPF:
 604                         rwpf = to_rwpf(subdev);
 605                         pipe->inputs[rwpf->entity.index] = rwpf;
 606                         rwpf->video->pipe_index = ++pipe->num_inputs;
 607                         rwpf->pipe = pipe;
 608                         break;
 609
 610                 case VSP1_ENTITY_WPF:
 611                         rwpf = to_rwpf(subdev);
 612                         pipe->output = rwpf;
 613                         rwpf->video->pipe_index = 0;
 614                         rwpf->pipe = pipe;
 615                         break;
 616
 617                 case VSP1_ENTITY_LIF:
 618                         pipe->lif = e;
 619                         break;
 620
 621                 case VSP1_ENTITY_BRU:
 622                 case VSP1_ENTITY_BRS:
 623                         pipe->bru = e;
 624                         break;
 625
 626                 case VSP1_ENTITY_HGO:
 627                         pipe->hgo = e;
 628                         to_hgo(subdev)->histo.pipe = pipe;
 629                         break;
 630
 631                 case VSP1_ENTITY_HGT:
 632                         pipe->hgt = e;
 633                         to_hgt(subdev)->histo.pipe = pipe;
 634                         break;
 635
 636                 default:
 637                         break;
 638                 }
 639         }
 640
 641         media_graph_walk_cleanup(&graph);
 642
 643         /* We need one output and at least one input. */
 644         if (pipe->num_inputs == 0 || !pipe->output)
 645                 return -EPIPE;
 646
 647         /*
 648          * Follow links downstream for each input and make sure the graph
 649          * contains no loop and that all branches end at the output WPF.
 650          */
 651         for (i = 0; i < video->vsp1->info->rpf_count; ++i) {
 652                 if (!pipe->inputs[i])
 653                         continue;
 654
 655                 ret = vsp1_video_pipeline_build_branch(pipe, pipe->inputs[i],
 656                                                        pipe->output);
 657                 if (ret < 0)
 658                         return ret;
 659         }
 660
 661         return 0;
 662 }
 663
 664 static int vsp1_video_pipeline_init(struct vsp1_pipeline *pipe,
 665                                     struct vsp1_video *video)
 666 {
 667         vsp1_pipeline_init(pipe);
 668
 669         pipe->frame_end = vsp1_video_pipeline_frame_end;
 670
 671         return vsp1_video_pipeline_build(pipe, video);
 672 }
 673
 674 static struct vsp1_pipeline *vsp1_video_pipeline_get(struct vsp1_video *video)
 675 {
 676         struct vsp1_pipeline *pipe;
 677         int ret;
 678
 679         /*
 680          * Get a pipeline object for the video node. If a pipeline has already
 681          * been allocated just increment its reference count and return it.
 682          * Otherwise allocate a new pipeline and initialize it, it will be freed
 683          * when the last reference is released.
 684          */
 685         if (!video->rwpf->pipe) {
 686                 pipe = kzalloc(sizeof(*pipe), GFP_KERNEL);
 687                 if (!pipe)
 688                         return ERR_PTR(-ENOMEM);
 689
 690                 ret = vsp1_video_pipeline_init(pipe, video);
 691                 if (ret < 0) {
 692                         vsp1_pipeline_reset(pipe);
 693                         kfree(pipe);
 694                         return ERR_PTR(ret);
 695                 }
 696         } else {
 697                 pipe = video->rwpf->pipe;
 698                 kref_get(&pipe->kref);
 699         }
 700
 701         return pipe;
 702 }
 703
 704 static void vsp1_video_pipeline_release(struct kref *kref)
 705 {
 706         struct vsp1_pipeline *pipe = container_of(kref, typeof(*pipe), kref);
 707
 708         vsp1_pipeline_reset(pipe);
 709         kfree(pipe);
 710 }
 711
 712 static void vsp1_video_pipeline_put(struct vsp1_pipeline *pipe)
 713 {
 714         struct media_device *mdev = &pipe->output->entity.vsp1->media_dev;
 715
 716         mutex_lock(&mdev->graph_mutex);
 717         kref_put(&pipe->kref, vsp1_video_pipeline_release);
 718         mutex_unlock(&mdev->graph_mutex);
 719 }
 720
 721 /* -----------------------------------------------------------------------------
 722  * videobuf2 Queue Operations
 723  */
 724
 725 static int
 726 vsp1_video_queue_setup(struct vb2_queue *vq,
 727                        unsigned int *nbuffers, unsigned int *nplanes,
 728                        unsigned int sizes[], struct device *alloc_devs[])
 729 {
 730         struct vsp1_video *video = vb2_get_drv_priv(vq);
 731         const struct v4l2_pix_format_mplane *format = &video->rwpf->format;
 732         unsigned int i;
 733
 734         if (*nplanes) {
 735                 if (*nplanes != format->num_planes)
 736                         return -EINVAL;
 737
 738                 for (i = 0; i < *nplanes; i++)
 739                         if (sizes[i] < format->plane_fmt[i].sizeimage)
 740                                 return -EINVAL;
 741                 return 0;
 742         }
 743
 744         *nplanes = format->num_planes;
 745
 746         for (i = 0; i < format->num_planes; ++i)
 747                 sizes[i] = format->plane_fmt[i].sizeimage;
 748
 749         return 0;
 750 }
 751
 752 static int vsp1_video_buffer_prepare(struct vb2_buffer *vb)
 753 {
 754         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 755         struct vsp1_video *video = vb2_get_drv_priv(vb->vb2_queue);
 756         struct vsp1_vb2_buffer *buf = to_vsp1_vb2_buffer(vbuf);
 757         const struct v4l2_pix_format_mplane *format = &video->rwpf->format;
 758         unsigned int i;
 759
 760         if (vb->num_planes < format->num_planes)
 761                 return -EINVAL;
 762
 763         for (i = 0; i < vb->num_planes; ++i) {
 764                 buf->mem.addr[i] = vb2_dma_contig_plane_dma_addr(vb, i);
 765
 766                 if (vb2_plane_size(vb, i) < format->plane_fmt[i].sizeimage)
 767                         return -EINVAL;
 768         }
 769
 770         for ( ; i < 3; ++i)
 771                 buf->mem.addr[i] = 0;
 772
 773         return 0;
 774 }
 775
 776 static void vsp1_video_buffer_queue(struct vb2_buffer *vb)
 777 {
 778         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 779         struct vsp1_video *video = vb2_get_drv_priv(vb->vb2_queue);
 780         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 781         struct vsp1_vb2_buffer *buf = to_vsp1_vb2_buffer(vbuf);
 782         unsigned long flags;
 783         bool empty;
 784
 785         spin_lock_irqsave(&video->irqlock, flags);
 786         empty = list_empty(&video->irqqueue);
 787         list_add_tail(&buf->queue, &video->irqqueue);
 788         spin_unlock_irqrestore(&video->irqlock, flags);
 789
 790         if (!empty)
 791                 return;
 792
 793         spin_lock_irqsave(&pipe->irqlock, flags);
 794
 795         video->rwpf->mem = buf->mem;
 796         pipe->buffers_ready |= 1 << video->pipe_index;
 797
 798         if (vb2_is_streaming(&video->queue) &&
 799             vsp1_pipeline_ready(pipe))
 800                 vsp1_video_pipeline_run(pipe);
 801
 802         spin_unlock_irqrestore(&pipe->irqlock, flags);
 803 }
 804
 805 static int vsp1_video_setup_pipeline(struct vsp1_pipeline *pipe)
 806 {
 807         struct vsp1_entity *entity;
 808         int ret;
 809
 810         /* Determine this pipelines sizes for image partitioning support. */
 811         ret = vsp1_video_pipeline_setup_partitions(pipe);
 812         if (ret < 0)
 813                 return ret;
 814
 815         /* Prepare the display list. */
 816         pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
 817         if (!pipe->dl)
 818                 return -ENOMEM;
 819
 820         if (pipe->uds) {
 821                 struct vsp1_uds *uds = to_uds(&pipe->uds->subdev);
 822
 823                 /*
 824                  * If a BRU or BRS is present in the pipeline before the UDS,
 825                  * the alpha component doesn't need to be scaled as the BRU and
 826                  * BRS output alpha value is fixed to 255. Otherwise we need to
 827                  * scale the alpha component only when available at the input
 828                  * RPF.
 829                  */
 830                 if (pipe->uds_input->type == VSP1_ENTITY_BRU ||
 831                     pipe->uds_input->type == VSP1_ENTITY_BRS) {
 832                         uds->scale_alpha = false;
 833                 } else {
 834                         struct vsp1_rwpf *rpf =
 835                                 to_rwpf(&pipe->uds_input->subdev);
 836
 837                         uds->scale_alpha = rpf->fmtinfo->alpha;
 838                 }
 839         }
 840
 841         list_for_each_entry(entity, &pipe->entities, list_pipe) {
 842                 vsp1_entity_route_setup(entity, pipe, pipe->dl);
 843
 844                 if (entity->ops->configure)
 845                         entity->ops->configure(entity, pipe, pipe->dl,
 846                                                VSP1_ENTITY_PARAMS_INIT);
 847         }
 848
 849         return 0;
 850 }
 851
 852 static void vsp1_video_cleanup_pipeline(struct vsp1_pipeline *pipe)
 853 {
 854         struct vsp1_video *video = pipe->output->video;
 855         struct vsp1_vb2_buffer *buffer;
 856         unsigned long flags;
 857
 858         /* Remove all buffers from the IRQ queue. */
 859         spin_lock_irqsave(&video->irqlock, flags);
 860         list_for_each_entry(buffer, &video->irqqueue, queue)
 861                 vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR);
 862         INIT_LIST_HEAD(&video->irqqueue);
 863         spin_unlock_irqrestore(&video->irqlock, flags);
 864
 865         /* Release our partition table allocation */
 866         mutex_lock(&pipe->lock);
 867         kfree(pipe->part_table);
 868         pipe->part_table = NULL;
 869         mutex_unlock(&pipe->lock);
 870 }
 871
 872 static int vsp1_video_start_streaming(struct vb2_queue *vq, unsigned int count)
 873 {
 874         struct vsp1_video *video = vb2_get_drv_priv(vq);
 875         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 876         bool start_pipeline = false;
 877         unsigned long flags;
 878         int ret;
 879
 880         mutex_lock(&pipe->lock);
 881         if (pipe->stream_count == pipe->num_inputs) {
 882                 ret = vsp1_video_setup_pipeline(pipe);
 883                 if (ret < 0) {
 884                         mutex_unlock(&pipe->lock);
 885                         vsp1_video_cleanup_pipeline(pipe);
 886                         return ret;
 887                 }
 888
 889                 start_pipeline = true;
 890         }
 891
 892         pipe->stream_count++;
 893         mutex_unlock(&pipe->lock);
 894
 895         /*
 896          * vsp1_pipeline_ready() is not sufficient to establish that all streams
 897          * are prepared and the pipeline is configured, as multiple streams
 898          * can race through streamon with buffers already queued; Therefore we
 899          * don't even attempt to start the pipeline until the last stream has
 900          * called through here.
 901          */
 902         if (!start_pipeline)
 903                 return 0;
 904
 905         spin_lock_irqsave(&pipe->irqlock, flags);
 906         if (vsp1_pipeline_ready(pipe))
 907                 vsp1_video_pipeline_run(pipe);
 908         spin_unlock_irqrestore(&pipe->irqlock, flags);
 909
 910         return 0;
 911 }
 912
 913 static void vsp1_video_stop_streaming(struct vb2_queue *vq)
 914 {
 915         struct vsp1_video *video = vb2_get_drv_priv(vq);
 916         struct vsp1_pipeline *pipe = video->rwpf->pipe;
 917         unsigned long flags;
 918         int ret;
 919
 920         /*
 921          * Clear the buffers ready flag to make sure the device won't be started
 922          * by a QBUF on the video node on the other side of the pipeline.
 923          */
 924         spin_lock_irqsave(&video->irqlock, flags);
 925         pipe->buffers_ready &= ~(1 << video->pipe_index);
 926         spin_unlock_irqrestore(&video->irqlock, flags);
 927
 928         mutex_lock(&pipe->lock);
 929         if (--pipe->stream_count == pipe->num_inputs) {
 930                 /* Stop the pipeline. */
 931                 ret = vsp1_pipeline_stop(pipe);
 932                 if (ret == -ETIMEDOUT)
 933                         dev_err(video->vsp1->dev, "pipeline stop timeout\n");
 934
 935                 vsp1_dl_list_put(pipe->dl);
 936                 pipe->dl = NULL;
 937         }
 938         mutex_unlock(&pipe->lock);
 939
 940         media_pipeline_stop(&video->video.entity);
 941         vsp1_video_cleanup_pipeline(pipe);
 942         vsp1_video_pipeline_put(pipe);
 943 }
 944
 945 static const struct vb2_ops vsp1_video_queue_qops = {
 946         .queue_setup = vsp1_video_queue_setup,
 947         .buf_prepare = vsp1_video_buffer_prepare,
 948         .buf_queue = vsp1_video_buffer_queue,
 949         .wait_prepare = vb2_ops_wait_prepare,
 950         .wait_finish = vb2_ops_wait_finish,
 951         .start_streaming = vsp1_video_start_streaming,
 952         .stop_streaming = vsp1_video_stop_streaming,
 953 };
 954
 955 /* -----------------------------------------------------------------------------
 956  * V4L2 ioctls
 957  */
 958
 959 static int
 960 vsp1_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 961 {
 962         struct v4l2_fh *vfh = file->private_data;
 963         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 964
 965         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 966                           | V4L2_CAP_VIDEO_CAPTURE_MPLANE
 967                           | V4L2_CAP_VIDEO_OUTPUT_MPLANE;
 968
 969         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
 970                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE
 971                                  | V4L2_CAP_STREAMING;
 972         else
 973                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT_MPLANE
 974                                  | V4L2_CAP_STREAMING;
 975
 976         strlcpy(cap->driver, "vsp1", sizeof(cap->driver));
 977         strlcpy(cap->card, video->video.name, sizeof(cap->card));
 978         snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
 979                  dev_name(video->vsp1->dev));
 980
 981         return 0;
 982 }
 983
 984 static int
 985 vsp1_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
 986 {
 987         struct v4l2_fh *vfh = file->private_data;
 988         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
 989
 990         if (format->type != video->queue.type)
 991                 return -EINVAL;
 992
 993         mutex_lock(&video->lock);
 994         format->fmt.pix_mp = video->rwpf->format;
 995         mutex_unlock(&video->lock);
 996
 997         return 0;
 998 }
 999
1000 static int
1001 vsp1_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
1002 {
1003         struct v4l2_fh *vfh = file->private_data;
1004         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
1005
1006         if (format->type != video->queue.type)
1007                 return -EINVAL;
1008
1009         return __vsp1_video_try_format(video, &format->fmt.pix_mp, NULL);
1010 }
1011
1012 static int
1013 vsp1_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
1014 {
1015         struct v4l2_fh *vfh = file->private_data;
1016         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
1017         const struct vsp1_format_info *info;
1018         int ret;
1019
1020         if (format->type != video->queue.type)
1021                 return -EINVAL;
1022
1023         ret = __vsp1_video_try_format(video, &format->fmt.pix_mp, &info);
1024         if (ret < 0)
1025                 return ret;
1026
1027         mutex_lock(&video->lock);
1028
1029         if (vb2_is_busy(&video->queue)) {
1030                 ret = -EBUSY;
1031                 goto done;
1032         }
1033
1034         video->rwpf->format = format->fmt.pix_mp;
1035         video->rwpf->fmtinfo = info;
1036
1037 done:
1038         mutex_unlock(&video->lock);
1039         return ret;
1040 }
1041
1042 static int
1043 vsp1_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
1044 {
1045         struct v4l2_fh *vfh = file->private_data;
1046         struct vsp1_video *video = to_vsp1_video(vfh->vdev);
1047         struct media_device *mdev = &video->vsp1->media_dev;
1048         struct vsp1_pipeline *pipe;
1049         int ret;
1050
1051         if (video->queue.owner && video->queue.owner != file->private_data)
1052                 return -EBUSY;
1053
1054         /*
1055          * Get a pipeline for the video node and start streaming on it. No link
1056          * touching an entity in the pipeline can be activated or deactivated
1057          * once streaming is started.
1058          */
1059         mutex_lock(&mdev->graph_mutex);
1060
1061         pipe = vsp1_video_pipeline_get(video);
1062         if (IS_ERR(pipe)) {
1063                 mutex_unlock(&mdev->graph_mutex);
1064                 return PTR_ERR(pipe);
1065         }
1066
1067         ret = __media_pipeline_start(&video->video.entity, &pipe->pipe);
1068         if (ret < 0) {
1069                 mutex_unlock(&mdev->graph_mutex);
1070                 goto err_pipe;
1071         }
1072
1073         mutex_unlock(&mdev->graph_mutex);
1074
1075         /*
1076          * Verify that the configured format matches the output of the connected
1077          * subdev.
1078          */
1079         ret = vsp1_video_verify_format(video);
1080         if (ret < 0)
1081                 goto err_stop;
1082
1083         /* Start the queue. */
1084         ret = vb2_streamon(&video->queue, type);
1085         if (ret < 0)
1086                 goto err_stop;
1087
1088         return 0;
1089
1090 err_stop:
1091         media_pipeline_stop(&video->video.entity);
1092 err_pipe:
1093         vsp1_video_pipeline_put(pipe);
1094         return ret;
1095 }
1096
1097 static const struct v4l2_ioctl_ops vsp1_video_ioctl_ops = {
1098         .vidioc_querycap                = vsp1_video_querycap,
1099         .vidioc_g_fmt_vid_cap_mplane    = vsp1_video_get_format,
1100         .vidioc_s_fmt_vid_cap_mplane    = vsp1_video_set_format,
1101         .vidioc_try_fmt_vid_cap_mplane  = vsp1_video_try_format,
1102         .vidioc_g_fmt_vid_out_mplane    = vsp1_video_get_format,
1103         .vidioc_s_fmt_vid_out_mplane    = vsp1_video_set_format,
1104         .vidioc_try_fmt_vid_out_mplane  = vsp1_video_try_format,
1105         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
1106         .vidioc_querybuf                = vb2_ioctl_querybuf,
1107         .vidioc_qbuf                    = vb2_ioctl_qbuf,
1108         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
1109         .vidioc_expbuf                  = vb2_ioctl_expbuf,
1110         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
1111         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
1112         .vidioc_streamon                = vsp1_video_streamon,
1113         .vidioc_streamoff               = vb2_ioctl_streamoff,
1114 };
1115
1116 /* -----------------------------------------------------------------------------
1117  * V4L2 File Operations
1118  */
1119
1120 static int vsp1_video_open(struct file *file)
1121 {
1122         struct vsp1_video *video = video_drvdata(file);
1123         struct v4l2_fh *vfh;
1124         int ret = 0;
1125
1126         vfh = kzalloc(sizeof(*vfh), GFP_KERNEL);
1127         if (vfh == NULL)
1128                 return -ENOMEM;
1129
1130         v4l2_fh_init(vfh, &video->video);
1131         v4l2_fh_add(vfh);
1132
1133         file->private_data = vfh;
1134
1135         ret = vsp1_device_get(video->vsp1);
1136         if (ret < 0) {
1137                 v4l2_fh_del(vfh);
1138                 v4l2_fh_exit(vfh);
1139                 kfree(vfh);
1140         }
1141
1142         return ret;
1143 }
1144
1145 static int vsp1_video_release(struct file *file)
1146 {
1147         struct vsp1_video *video = video_drvdata(file);
1148         struct v4l2_fh *vfh = file->private_data;
1149
1150         mutex_lock(&video->lock);
1151         if (video->queue.owner == vfh) {
1152                 vb2_queue_release(&video->queue);
1153                 video->queue.owner = NULL;
1154         }
1155         mutex_unlock(&video->lock);
1156
1157         vsp1_device_put(video->vsp1);
1158
1159         v4l2_fh_release(file);
1160
1161         file->private_data = NULL;
1162
1163         return 0;
1164 }
1165
1166 static const struct v4l2_file_operations vsp1_video_fops = {
1167         .owner = THIS_MODULE,
1168         .unlocked_ioctl = video_ioctl2,
1169         .open = vsp1_video_open,
1170         .release = vsp1_video_release,
1171         .poll = vb2_fop_poll,
1172         .mmap = vb2_fop_mmap,
1173 };
1174
1175 /* -----------------------------------------------------------------------------
1176  * Initialization and Cleanup
1177  */
1178
1179 struct vsp1_video *vsp1_video_create(struct vsp1_device *vsp1,
1180                                      struct vsp1_rwpf *rwpf)
1181 {
1182         struct vsp1_video *video;
1183         const char *direction;
1184         int ret;
1185
1186         video = devm_kzalloc(vsp1->dev, sizeof(*video), GFP_KERNEL);
1187         if (!video)
1188                 return ERR_PTR(-ENOMEM);
1189
1190         rwpf->video = video;
1191
1192         video->vsp1 = vsp1;
1193         video->rwpf = rwpf;
1194
1195         if (rwpf->entity.type == VSP1_ENTITY_RPF) {
1196                 direction = "input";
1197                 video->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
1198                 video->pad.flags = MEDIA_PAD_FL_SOURCE;
1199                 video->video.vfl_dir = VFL_DIR_TX;
1200         } else {
1201                 direction = "output";
1202                 video->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
1203                 video->pad.flags = MEDIA_PAD_FL_SINK;
1204                 video->video.vfl_dir = VFL_DIR_RX;
1205         }
1206
1207         mutex_init(&video->lock);
1208         spin_lock_init(&video->irqlock);
1209         INIT_LIST_HEAD(&video->irqqueue);
1210
1211         /* Initialize the media entity... */
1212         ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
1213         if (ret < 0)
1214                 return ERR_PTR(ret);
1215
1216         /* ... and the format ... */
1217         rwpf->format.pixelformat = VSP1_VIDEO_DEF_FORMAT;
1218         rwpf->format.width = VSP1_VIDEO_DEF_WIDTH;
1219         rwpf->format.height = VSP1_VIDEO_DEF_HEIGHT;
1220         __vsp1_video_try_format(video, &rwpf->format, &rwpf->fmtinfo);
1221
1222         /* ... and the video node... */
1223         video->video.v4l2_dev = &video->vsp1->v4l2_dev;
1224         video->video.fops = &vsp1_video_fops;
1225         snprintf(video->video.name, sizeof(video->video.name), "%s %s",
1226                  rwpf->entity.subdev.name, direction);
1227         video->video.vfl_type = VFL_TYPE_GRABBER;
1228         video->video.release = video_device_release_empty;
1229         video->video.ioctl_ops = &vsp1_video_ioctl_ops;
1230
1231         video_set_drvdata(&video->video, video);
1232
1233         video->queue.type = video->type;
1234         video->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
1235         video->queue.lock = &video->lock;
1236         video->queue.drv_priv = video;
1237         video->queue.buf_struct_size = sizeof(struct vsp1_vb2_buffer);
1238         video->queue.ops = &vsp1_video_queue_qops;
1239         video->queue.mem_ops = &vb2_dma_contig_memops;
1240         video->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
1241         video->queue.dev = video->vsp1->bus_master;
1242         ret = vb2_queue_init(&video->queue);
1243         if (ret < 0) {
1244                 dev_err(video->vsp1->dev, "failed to initialize vb2 queue\n");
1245                 goto error;
1246         }
1247
1248         /* ... and register the video device. */
1249         video->video.queue = &video->queue;
1250         ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1251         if (ret < 0) {
1252                 dev_err(video->vsp1->dev, "failed to register video device\n");
1253                 goto error;
1254         }
1255
1256         return video;
1257
1258 error:
1259         vsp1_video_cleanup(video);
1260         return ERR_PTR(ret);
1261 }
1262
1263 void vsp1_video_cleanup(struct vsp1_video *video)
1264 {
1265         if (video_is_registered(&video->video))
1266                 video_unregister_device(&video->video);
1267
1268         media_entity_cleanup(&video->video.entity);
1269 }