drivers/media/platform/omap3isp/ispvideo.c

   1 /*
   2  * ispvideo.c
   3  *
   4  * TI OMAP3 ISP - Generic video node
   5  *
   6  * Copyright (C) 2009-2010 Nokia Corporation
   7  *
   8  * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   9  *           Sakari Ailus <sakari.ailus@iki.fi>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <asm/cacheflush.h>
  17 #include <linux/clk.h>
  18 #include <linux/mm.h>
  19 #include <linux/module.h>
  20 #include <linux/pagemap.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/sched.h>
  23 #include <linux/slab.h>
  24 #include <linux/vmalloc.h>
  25
  26 #include <media/v4l2-dev.h>
  27 #include <media/v4l2-ioctl.h>
  28 #include <media/v4l2-mc.h>
  29 #include <media/videobuf2-dma-contig.h>
  30
  31 #include "ispvideo.h"
  32 #include "isp.h"
  33
  34
  35 /* -----------------------------------------------------------------------------
  36  * Helper functions
  37  */
  38
  39 /*
  40  * NOTE: When adding new media bus codes, always remember to add
  41  * corresponding in-memory formats to the table below!!!
  42  */
  43 static struct isp_format_info formats[] = {
  44         { MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
  45           MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
  46           V4L2_PIX_FMT_GREY, 8, 1, },
  47         { MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
  48           MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
  49           V4L2_PIX_FMT_Y10, 10, 2, },
  50         { MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
  51           MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
  52           V4L2_PIX_FMT_Y12, 12, 2, },
  53         { MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
  54           MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
  55           V4L2_PIX_FMT_SBGGR8, 8, 1, },
  56         { MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
  57           MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
  58           V4L2_PIX_FMT_SGBRG8, 8, 1, },
  59         { MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
  60           MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
  61           V4L2_PIX_FMT_SGRBG8, 8, 1, },
  62         { MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
  63           MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
  64           V4L2_PIX_FMT_SRGGB8, 8, 1, },
  65         { MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8, MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
  66           MEDIA_BUS_FMT_SBGGR10_1X10, 0,
  67           V4L2_PIX_FMT_SBGGR10DPCM8, 8, 1, },
  68         { MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8, MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
  69           MEDIA_BUS_FMT_SGBRG10_1X10, 0,
  70           V4L2_PIX_FMT_SGBRG10DPCM8, 8, 1, },
  71         { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
  72           MEDIA_BUS_FMT_SGRBG10_1X10, 0,
  73           V4L2_PIX_FMT_SGRBG10DPCM8, 8, 1, },
  74         { MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8, MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
  75           MEDIA_BUS_FMT_SRGGB10_1X10, 0,
  76           V4L2_PIX_FMT_SRGGB10DPCM8, 8, 1, },
  77         { MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
  78           MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
  79           V4L2_PIX_FMT_SBGGR10, 10, 2, },
  80         { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
  81           MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
  82           V4L2_PIX_FMT_SGBRG10, 10, 2, },
  83         { MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
  84           MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
  85           V4L2_PIX_FMT_SGRBG10, 10, 2, },
  86         { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
  87           MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
  88           V4L2_PIX_FMT_SRGGB10, 10, 2, },
  89         { MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
  90           MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
  91           V4L2_PIX_FMT_SBGGR12, 12, 2, },
  92         { MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
  93           MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
  94           V4L2_PIX_FMT_SGBRG12, 12, 2, },
  95         { MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
  96           MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
  97           V4L2_PIX_FMT_SGRBG12, 12, 2, },
  98         { MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
  99           MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
 100           V4L2_PIX_FMT_SRGGB12, 12, 2, },
 101         { MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
 102           MEDIA_BUS_FMT_UYVY8_1X16, 0,
 103           V4L2_PIX_FMT_UYVY, 16, 2, },
 104         { MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
 105           MEDIA_BUS_FMT_YUYV8_1X16, 0,
 106           V4L2_PIX_FMT_YUYV, 16, 2, },
 107         { MEDIA_BUS_FMT_UYVY8_2X8, MEDIA_BUS_FMT_UYVY8_2X8,
 108           MEDIA_BUS_FMT_UYVY8_2X8, 0,
 109           V4L2_PIX_FMT_UYVY, 8, 2, },
 110         { MEDIA_BUS_FMT_YUYV8_2X8, MEDIA_BUS_FMT_YUYV8_2X8,
 111           MEDIA_BUS_FMT_YUYV8_2X8, 0,
 112           V4L2_PIX_FMT_YUYV, 8, 2, },
 113         /* Empty entry to catch the unsupported pixel code (0) used by the CCDC
 114          * module and avoid NULL pointer dereferences.
 115          */
 116         { 0, }
 117 };
 118
 119 const struct isp_format_info *omap3isp_video_format_info(u32 code)
 120 {
 121         unsigned int i;
 122
 123         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
 124                 if (formats[i].code == code)
 125                         return &formats[i];
 126         }
 127
 128         return NULL;
 129 }
 130
 131 /*
 132  * isp_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
 133  * @video: ISP video instance
 134  * @mbus: v4l2_mbus_framefmt format (input)
 135  * @pix: v4l2_pix_format format (output)
 136  *
 137  * Fill the output pix structure with information from the input mbus format.
 138  * The bytesperline and sizeimage fields are computed from the requested bytes
 139  * per line value in the pix format and information from the video instance.
 140  *
 141  * Return the number of padding bytes at end of line.
 142  */
 143 static unsigned int isp_video_mbus_to_pix(const struct isp_video *video,
 144                                           const struct v4l2_mbus_framefmt *mbus,
 145                                           struct v4l2_pix_format *pix)
 146 {
 147         unsigned int bpl = pix->bytesperline;
 148         unsigned int min_bpl;
 149         unsigned int i;
 150
 151         memset(pix, 0, sizeof(*pix));
 152         pix->width = mbus->width;
 153         pix->height = mbus->height;
 154
 155         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
 156                 if (formats[i].code == mbus->code)
 157                         break;
 158         }
 159
 160         if (WARN_ON(i == ARRAY_SIZE(formats)))
 161                 return 0;
 162
 163         min_bpl = pix->width * formats[i].bpp;
 164
 165         /* Clamp the requested bytes per line value. If the maximum bytes per
 166          * line value is zero, the module doesn't support user configurable line
 167          * sizes. Override the requested value with the minimum in that case.
 168          */
 169         if (video->bpl_max)
 170                 bpl = clamp(bpl, min_bpl, video->bpl_max);
 171         else
 172                 bpl = min_bpl;
 173
 174         if (!video->bpl_zero_padding || bpl != min_bpl)
 175                 bpl = ALIGN(bpl, video->bpl_alignment);
 176
 177         pix->pixelformat = formats[i].pixelformat;
 178         pix->bytesperline = bpl;
 179         pix->sizeimage = pix->bytesperline * pix->height;
 180         pix->colorspace = mbus->colorspace;
 181         pix->field = mbus->field;
 182
 183         return bpl - min_bpl;
 184 }
 185
 186 static void isp_video_pix_to_mbus(const struct v4l2_pix_format *pix,
 187                                   struct v4l2_mbus_framefmt *mbus)
 188 {
 189         unsigned int i;
 190
 191         memset(mbus, 0, sizeof(*mbus));
 192         mbus->width = pix->width;
 193         mbus->height = pix->height;
 194
 195         /* Skip the last format in the loop so that it will be selected if no
 196          * match is found.
 197          */
 198         for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
 199                 if (formats[i].pixelformat == pix->pixelformat)
 200                         break;
 201         }
 202
 203         mbus->code = formats[i].code;
 204         mbus->colorspace = pix->colorspace;
 205         mbus->field = pix->field;
 206 }
 207
 208 static struct v4l2_subdev *
 209 isp_video_remote_subdev(struct isp_video *video, u32 *pad)
 210 {
 211         struct media_pad *remote;
 212
 213         remote = media_entity_remote_pad(&video->pad);
 214
 215         if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
 216                 return NULL;
 217
 218         if (pad)
 219                 *pad = remote->index;
 220
 221         return media_entity_to_v4l2_subdev(remote->entity);
 222 }
 223
 224 /* Return a pointer to the ISP video instance at the far end of the pipeline. */
 225 static int isp_video_get_graph_data(struct isp_video *video,
 226                                     struct isp_pipeline *pipe)
 227 {
 228         struct media_entity_graph graph;
 229         struct media_entity *entity = &video->video.entity;
 230         struct media_device *mdev = entity->graph_obj.mdev;
 231         struct isp_video *far_end = NULL;
 232         int ret;
 233
 234         mutex_lock(&mdev->graph_mutex);
 235         ret = media_entity_graph_walk_init(&graph, entity->graph_obj.mdev);
 236         if (ret) {
 237                 mutex_unlock(&mdev->graph_mutex);
 238                 return ret;
 239         }
 240
 241         media_entity_graph_walk_start(&graph, entity);
 242
 243         while ((entity = media_entity_graph_walk_next(&graph))) {
 244                 struct isp_video *__video;
 245
 246                 media_entity_enum_set(&pipe->ent_enum, entity);
 247
 248                 if (far_end != NULL)
 249                         continue;
 250
 251                 if (entity == &video->video.entity)
 252                         continue;
 253
 254                 if (!is_media_entity_v4l2_io(entity))
 255                         continue;
 256
 257                 __video = to_isp_video(media_entity_to_video_device(entity));
 258                 if (__video->type != video->type)
 259                         far_end = __video;
 260         }
 261
 262         mutex_unlock(&mdev->graph_mutex);
 263
 264         media_entity_graph_walk_cleanup(&graph);
 265
 266         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 267                 pipe->input = far_end;
 268                 pipe->output = video;
 269         } else {
 270                 if (far_end == NULL)
 271                         return -EPIPE;
 272
 273                 pipe->input = video;
 274                 pipe->output = far_end;
 275         }
 276
 277         return 0;
 278 }
 279
 280 static int
 281 __isp_video_get_format(struct isp_video *video, struct v4l2_format *format)
 282 {
 283         struct v4l2_subdev_format fmt;
 284         struct v4l2_subdev *subdev;
 285         u32 pad;
 286         int ret;
 287
 288         subdev = isp_video_remote_subdev(video, &pad);
 289         if (subdev == NULL)
 290                 return -EINVAL;
 291
 292         fmt.pad = pad;
 293         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 294
 295         mutex_lock(&video->mutex);
 296         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 297         mutex_unlock(&video->mutex);
 298
 299         if (ret)
 300                 return ret;
 301
 302         format->type = video->type;
 303         return isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
 304 }
 305
 306 static int
 307 isp_video_check_format(struct isp_video *video, struct isp_video_fh *vfh)
 308 {
 309         struct v4l2_format format;
 310         int ret;
 311
 312         memcpy(&format, &vfh->format, sizeof(format));
 313         ret = __isp_video_get_format(video, &format);
 314         if (ret < 0)
 315                 return ret;
 316
 317         if (vfh->format.fmt.pix.pixelformat != format.fmt.pix.pixelformat ||
 318             vfh->format.fmt.pix.height != format.fmt.pix.height ||
 319             vfh->format.fmt.pix.width != format.fmt.pix.width ||
 320             vfh->format.fmt.pix.bytesperline != format.fmt.pix.bytesperline ||
 321             vfh->format.fmt.pix.sizeimage != format.fmt.pix.sizeimage ||
 322             vfh->format.fmt.pix.field != format.fmt.pix.field)
 323                 return -EINVAL;
 324
 325         return 0;
 326 }
 327
 328 /* -----------------------------------------------------------------------------
 329  * Video queue operations
 330  */
 331
 332 static int isp_video_queue_setup(struct vb2_queue *queue,
 333                                  unsigned int *count, unsigned int *num_planes,
 334                                  unsigned int sizes[], void *alloc_ctxs[])
 335 {
 336         struct isp_video_fh *vfh = vb2_get_drv_priv(queue);
 337         struct isp_video *video = vfh->video;
 338
 339         *num_planes = 1;
 340
 341         sizes[0] = vfh->format.fmt.pix.sizeimage;
 342         if (sizes[0] == 0)
 343                 return -EINVAL;
 344
 345         alloc_ctxs[0] = video->alloc_ctx;
 346
 347         *count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
 348
 349         return 0;
 350 }
 351
 352 static int isp_video_buffer_prepare(struct vb2_buffer *buf)
 353 {
 354         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(buf);
 355         struct isp_video_fh *vfh = vb2_get_drv_priv(buf->vb2_queue);
 356         struct isp_buffer *buffer = to_isp_buffer(vbuf);
 357         struct isp_video *video = vfh->video;
 358         dma_addr_t addr;
 359
 360         /* Refuse to prepare the buffer is the video node has registered an
 361          * error. We don't need to take any lock here as the operation is
 362          * inherently racy. The authoritative check will be performed in the
 363          * queue handler, which can't return an error, this check is just a best
 364          * effort to notify userspace as early as possible.
 365          */
 366         if (unlikely(video->error))
 367                 return -EIO;
 368
 369         addr = vb2_dma_contig_plane_dma_addr(buf, 0);
 370         if (!IS_ALIGNED(addr, 32)) {
 371                 dev_dbg(video->isp->dev,
 372                         "Buffer address must be aligned to 32 bytes boundary.\n");
 373                 return -EINVAL;
 374         }
 375
 376         vb2_set_plane_payload(&buffer->vb.vb2_buf, 0,
 377                               vfh->format.fmt.pix.sizeimage);
 378         buffer->dma = addr;
 379
 380         return 0;
 381 }
 382
 383 /*
 384  * isp_video_buffer_queue - Add buffer to streaming queue
 385  * @buf: Video buffer
 386  *
 387  * In memory-to-memory mode, start streaming on the pipeline if buffers are
 388  * queued on both the input and the output, if the pipeline isn't already busy.
 389  * If the pipeline is busy, it will be restarted in the output module interrupt
 390  * handler.
 391  */
 392 static void isp_video_buffer_queue(struct vb2_buffer *buf)
 393 {
 394         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(buf);
 395         struct isp_video_fh *vfh = vb2_get_drv_priv(buf->vb2_queue);
 396         struct isp_buffer *buffer = to_isp_buffer(vbuf);
 397         struct isp_video *video = vfh->video;
 398         struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
 399         enum isp_pipeline_state state;
 400         unsigned long flags;
 401         unsigned int empty;
 402         unsigned int start;
 403
 404         spin_lock_irqsave(&video->irqlock, flags);
 405
 406         if (unlikely(video->error)) {
 407                 vb2_buffer_done(&buffer->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 408                 spin_unlock_irqrestore(&video->irqlock, flags);
 409                 return;
 410         }
 411
 412         empty = list_empty(&video->dmaqueue);
 413         list_add_tail(&buffer->irqlist, &video->dmaqueue);
 414
 415         spin_unlock_irqrestore(&video->irqlock, flags);
 416
 417         if (empty) {
 418                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 419                         state = ISP_PIPELINE_QUEUE_OUTPUT;
 420                 else
 421                         state = ISP_PIPELINE_QUEUE_INPUT;
 422
 423                 spin_lock_irqsave(&pipe->lock, flags);
 424                 pipe->state |= state;
 425                 video->ops->queue(video, buffer);
 426                 video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;
 427
 428                 start = isp_pipeline_ready(pipe);
 429                 if (start)
 430                         pipe->state |= ISP_PIPELINE_STREAM;
 431                 spin_unlock_irqrestore(&pipe->lock, flags);
 432
 433                 if (start)
 434                         omap3isp_pipeline_set_stream(pipe,
 435                                                 ISP_PIPELINE_STREAM_SINGLESHOT);
 436         }
 437 }
 438
 439 /*
 440  * omap3isp_video_return_buffers - Return all queued buffers to videobuf2
 441  * @video: ISP video object
 442  * @state: new state for the returned buffers
 443  *
 444  * Return all buffers queued on the video node to videobuf2 in the given state.
 445  * The buffer state should be VB2_BUF_STATE_QUEUED if called due to an error
 446  * when starting the stream, or VB2_BUF_STATE_ERROR otherwise.
 447  *
 448  * The function must be called with the video irqlock held.
 449  */
 450 static void omap3isp_video_return_buffers(struct isp_video *video,
 451                                           enum vb2_buffer_state state)
 452 {
 453         while (!list_empty(&video->dmaqueue)) {
 454                 struct isp_buffer *buf;
 455
 456                 buf = list_first_entry(&video->dmaqueue,
 457                                        struct isp_buffer, irqlist);
 458                 list_del(&buf->irqlist);
 459                 vb2_buffer_done(&buf->vb.vb2_buf, state);
 460         }
 461 }
 462
 463 static int isp_video_start_streaming(struct vb2_queue *queue,
 464                                      unsigned int count)
 465 {
 466         struct isp_video_fh *vfh = vb2_get_drv_priv(queue);
 467         struct isp_video *video = vfh->video;
 468         struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
 469         unsigned long flags;
 470         int ret;
 471
 472         /* In sensor-to-memory mode, the stream can be started synchronously
 473          * to the stream on command. In memory-to-memory mode, it will be
 474          * started when buffers are queued on both the input and output.
 475          */
 476         if (pipe->input)
 477                 return 0;
 478
 479         ret = omap3isp_pipeline_set_stream(pipe,
 480                                            ISP_PIPELINE_STREAM_CONTINUOUS);
 481         if (ret < 0) {
 482                 spin_lock_irqsave(&video->irqlock, flags);
 483                 omap3isp_video_return_buffers(video, VB2_BUF_STATE_QUEUED);
 484                 spin_unlock_irqrestore(&video->irqlock, flags);
 485                 return ret;
 486         }
 487
 488         spin_lock_irqsave(&video->irqlock, flags);
 489         if (list_empty(&video->dmaqueue))
 490                 video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
 491         spin_unlock_irqrestore(&video->irqlock, flags);
 492
 493         return 0;
 494 }
 495
 496 static const struct vb2_ops isp_video_queue_ops = {
 497         .queue_setup = isp_video_queue_setup,
 498         .buf_prepare = isp_video_buffer_prepare,
 499         .buf_queue = isp_video_buffer_queue,
 500         .start_streaming = isp_video_start_streaming,
 501 };
 502
 503 /*
 504  * omap3isp_video_buffer_next - Complete the current buffer and return the next
 505  * @video: ISP video object
 506  *
 507  * Remove the current video buffer from the DMA queue and fill its timestamp and
 508  * field count before handing it back to videobuf2.
 509  *
 510  * For capture video nodes the buffer state is set to VB2_BUF_STATE_DONE if no
 511  * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
 512  * For video output nodes the buffer state is always set to VB2_BUF_STATE_DONE.
 513  *
 514  * The DMA queue is expected to contain at least one buffer.
 515  *
 516  * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
 517  * empty.
 518  */
 519 struct isp_buffer *omap3isp_video_buffer_next(struct isp_video *video)
 520 {
 521         struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
 522         enum vb2_buffer_state vb_state;
 523         struct isp_buffer *buf;
 524         unsigned long flags;
 525
 526         spin_lock_irqsave(&video->irqlock, flags);
 527         if (WARN_ON(list_empty(&video->dmaqueue))) {
 528                 spin_unlock_irqrestore(&video->irqlock, flags);
 529                 return NULL;
 530         }
 531
 532         buf = list_first_entry(&video->dmaqueue, struct isp_buffer,
 533                                irqlist);
 534         list_del(&buf->irqlist);
 535         spin_unlock_irqrestore(&video->irqlock, flags);
 536
 537         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 538
 539         /* Do frame number propagation only if this is the output video node.
 540          * Frame number either comes from the CSI receivers or it gets
 541          * incremented here if H3A is not active.
 542          * Note: There is no guarantee that the output buffer will finish
 543          * first, so the input number might lag behind by 1 in some cases.
 544          */
 545         if (video == pipe->output && !pipe->do_propagation)
 546                 buf->vb.sequence =
 547                         atomic_inc_return(&pipe->frame_number);
 548         else
 549                 buf->vb.sequence = atomic_read(&pipe->frame_number);
 550
 551         if (pipe->field != V4L2_FIELD_NONE)
 552                 buf->vb.sequence /= 2;
 553
 554         buf->vb.field = pipe->field;
 555
 556         /* Report pipeline errors to userspace on the capture device side. */
 557         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->error) {
 558                 vb_state = VB2_BUF_STATE_ERROR;
 559                 pipe->error = false;
 560         } else {
 561                 vb_state = VB2_BUF_STATE_DONE;
 562         }
 563
 564         vb2_buffer_done(&buf->vb.vb2_buf, vb_state);
 565
 566         spin_lock_irqsave(&video->irqlock, flags);
 567
 568         if (list_empty(&video->dmaqueue)) {
 569                 enum isp_pipeline_state state;
 570
 571                 spin_unlock_irqrestore(&video->irqlock, flags);
 572
 573                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 574                         state = ISP_PIPELINE_QUEUE_OUTPUT
 575                               | ISP_PIPELINE_STREAM;
 576                 else
 577                         state = ISP_PIPELINE_QUEUE_INPUT
 578                               | ISP_PIPELINE_STREAM;
 579
 580                 spin_lock_irqsave(&pipe->lock, flags);
 581                 pipe->state &= ~state;
 582                 if (video->pipe.stream_state == ISP_PIPELINE_STREAM_CONTINUOUS)
 583                         video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
 584                 spin_unlock_irqrestore(&pipe->lock, flags);
 585                 return NULL;
 586         }
 587
 588         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
 589                 spin_lock(&pipe->lock);
 590                 pipe->state &= ~ISP_PIPELINE_STREAM;
 591                 spin_unlock(&pipe->lock);
 592         }
 593
 594         buf = list_first_entry(&video->dmaqueue, struct isp_buffer,
 595                                irqlist);
 596
 597         spin_unlock_irqrestore(&video->irqlock, flags);
 598
 599         return buf;
 600 }
 601
 602 /*
 603  * omap3isp_video_cancel_stream - Cancel stream on a video node
 604  * @video: ISP video object
 605  *
 606  * Cancelling a stream returns all buffers queued on the video node to videobuf2
 607  * in the erroneous state and makes sure no new buffer can be queued.
 608  */
 609 void omap3isp_video_cancel_stream(struct isp_video *video)
 610 {
 611         unsigned long flags;
 612
 613         spin_lock_irqsave(&video->irqlock, flags);
 614         omap3isp_video_return_buffers(video, VB2_BUF_STATE_ERROR);
 615         video->error = true;
 616         spin_unlock_irqrestore(&video->irqlock, flags);
 617 }
 618
 619 /*
 620  * omap3isp_video_resume - Perform resume operation on the buffers
 621  * @video: ISP video object
 622  * @continuous: Pipeline is in single shot mode if 0 or continuous mode otherwise
 623  *
 624  * This function is intended to be used on suspend/resume scenario. It
 625  * requests video queue layer to discard buffers marked as DONE if it's in
 626  * continuous mode and requests ISP modules to queue again the ACTIVE buffer
 627  * if there's any.
 628  */
 629 void omap3isp_video_resume(struct isp_video *video, int continuous)
 630 {
 631         struct isp_buffer *buf = NULL;
 632
 633         if (continuous && video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 634                 mutex_lock(&video->queue_lock);
 635                 vb2_discard_done(video->queue);
 636                 mutex_unlock(&video->queue_lock);
 637         }
 638
 639         if (!list_empty(&video->dmaqueue)) {
 640                 buf = list_first_entry(&video->dmaqueue,
 641                                        struct isp_buffer, irqlist);
 642                 video->ops->queue(video, buf);
 643                 video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;
 644         } else {
 645                 if (continuous)
 646                         video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
 647         }
 648 }
 649
 650 /* -----------------------------------------------------------------------------
 651  * V4L2 ioctls
 652  */
 653
 654 static int
 655 isp_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 656 {
 657         struct isp_video *video = video_drvdata(file);
 658
 659         strlcpy(cap->driver, ISP_VIDEO_DRIVER_NAME, sizeof(cap->driver));
 660         strlcpy(cap->card, video->video.name, sizeof(cap->card));
 661         strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
 662
 663         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
 664                 | V4L2_CAP_STREAMING | V4L2_CAP_DEVICE_CAPS;
 665
 666         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 667                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 668         else
 669                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 670
 671         return 0;
 672 }
 673
 674 static int
 675 isp_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
 676 {
 677         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 678         struct isp_video *video = video_drvdata(file);
 679
 680         if (format->type != video->type)
 681                 return -EINVAL;
 682
 683         mutex_lock(&video->mutex);
 684         *format = vfh->format;
 685         mutex_unlock(&video->mutex);
 686
 687         return 0;
 688 }
 689
 690 static int
 691 isp_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
 692 {
 693         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 694         struct isp_video *video = video_drvdata(file);
 695         struct v4l2_mbus_framefmt fmt;
 696
 697         if (format->type != video->type)
 698                 return -EINVAL;
 699
 700         /* Replace unsupported field orders with sane defaults. */
 701         switch (format->fmt.pix.field) {
 702         case V4L2_FIELD_NONE:
 703                 /* Progressive is supported everywhere. */
 704                 break;
 705         case V4L2_FIELD_ALTERNATE:
 706                 /* ALTERNATE is not supported on output nodes. */
 707                 if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 708                         format->fmt.pix.field = V4L2_FIELD_NONE;
 709                 break;
 710         case V4L2_FIELD_INTERLACED:
 711                 /* The ISP has no concept of video standard, select the
 712                  * top-bottom order when the unqualified interlaced order is
 713                  * requested.
 714                  */
 715                 format->fmt.pix.field = V4L2_FIELD_INTERLACED_TB;
 716                 /* Fall-through */
 717         case V4L2_FIELD_INTERLACED_TB:
 718         case V4L2_FIELD_INTERLACED_BT:
 719                 /* Interlaced orders are only supported at the CCDC output. */
 720                 if (video != &video->isp->isp_ccdc.video_out)
 721                         format->fmt.pix.field = V4L2_FIELD_NONE;
 722                 break;
 723         case V4L2_FIELD_TOP:
 724         case V4L2_FIELD_BOTTOM:
 725         case V4L2_FIELD_SEQ_TB:
 726         case V4L2_FIELD_SEQ_BT:
 727         default:
 728                 /* All other field orders are currently unsupported, default to
 729                  * progressive.
 730                  */
 731                 format->fmt.pix.field = V4L2_FIELD_NONE;
 732                 break;
 733         }
 734
 735         /* Fill the bytesperline and sizeimage fields by converting to media bus
 736          * format and back to pixel format.
 737          */
 738         isp_video_pix_to_mbus(&format->fmt.pix, &fmt);
 739         isp_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
 740
 741         mutex_lock(&video->mutex);
 742         vfh->format = *format;
 743         mutex_unlock(&video->mutex);
 744
 745         return 0;
 746 }
 747
 748 static int
 749 isp_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
 750 {
 751         struct isp_video *video = video_drvdata(file);
 752         struct v4l2_subdev_format fmt;
 753         struct v4l2_subdev *subdev;
 754         u32 pad;
 755         int ret;
 756
 757         if (format->type != video->type)
 758                 return -EINVAL;
 759
 760         subdev = isp_video_remote_subdev(video, &pad);
 761         if (subdev == NULL)
 762                 return -EINVAL;
 763
 764         isp_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
 765
 766         fmt.pad = pad;
 767         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 768         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 769         if (ret)
 770                 return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 771
 772         isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
 773         return 0;
 774 }
 775
 776 static int
 777 isp_video_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropcap)
 778 {
 779         struct isp_video *video = video_drvdata(file);
 780         struct v4l2_subdev *subdev;
 781         int ret;
 782
 783         subdev = isp_video_remote_subdev(video, NULL);
 784         if (subdev == NULL)
 785                 return -EINVAL;
 786
 787         mutex_lock(&video->mutex);
 788         ret = v4l2_subdev_call(subdev, video, cropcap, cropcap);
 789         mutex_unlock(&video->mutex);
 790
 791         return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 792 }
 793
 794 static int
 795 isp_video_get_crop(struct file *file, void *fh, struct v4l2_crop *crop)
 796 {
 797         struct isp_video *video = video_drvdata(file);
 798         struct v4l2_subdev_format format;
 799         struct v4l2_subdev *subdev;
 800         u32 pad;
 801         int ret;
 802
 803         subdev = isp_video_remote_subdev(video, &pad);
 804         if (subdev == NULL)
 805                 return -EINVAL;
 806
 807         /* Try the get crop operation first and fallback to get format if not
 808          * implemented.
 809          */
 810         ret = v4l2_subdev_call(subdev, video, g_crop, crop);
 811         if (ret != -ENOIOCTLCMD)
 812                 return ret;
 813
 814         format.pad = pad;
 815         format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 816         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
 817         if (ret < 0)
 818                 return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 819
 820         crop->c.left = 0;
 821         crop->c.top = 0;
 822         crop->c.width = format.format.width;
 823         crop->c.height = format.format.height;
 824
 825         return 0;
 826 }
 827
 828 static int
 829 isp_video_set_crop(struct file *file, void *fh, const struct v4l2_crop *crop)
 830 {
 831         struct isp_video *video = video_drvdata(file);
 832         struct v4l2_subdev *subdev;
 833         int ret;
 834
 835         subdev = isp_video_remote_subdev(video, NULL);
 836         if (subdev == NULL)
 837                 return -EINVAL;
 838
 839         mutex_lock(&video->mutex);
 840         ret = v4l2_subdev_call(subdev, video, s_crop, crop);
 841         mutex_unlock(&video->mutex);
 842
 843         return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 844 }
 845
 846 static int
 847 isp_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 848 {
 849         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 850         struct isp_video *video = video_drvdata(file);
 851
 852         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 853             video->type != a->type)
 854                 return -EINVAL;
 855
 856         memset(a, 0, sizeof(*a));
 857         a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 858         a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 859         a->parm.output.timeperframe = vfh->timeperframe;
 860
 861         return 0;
 862 }
 863
 864 static int
 865 isp_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 866 {
 867         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 868         struct isp_video *video = video_drvdata(file);
 869
 870         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 871             video->type != a->type)
 872                 return -EINVAL;
 873
 874         if (a->parm.output.timeperframe.denominator == 0)
 875                 a->parm.output.timeperframe.denominator = 1;
 876
 877         vfh->timeperframe = a->parm.output.timeperframe;
 878
 879         return 0;
 880 }
 881
 882 static int
 883 isp_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
 884 {
 885         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 886         struct isp_video *video = video_drvdata(file);
 887         int ret;
 888
 889         mutex_lock(&video->queue_lock);
 890         ret = vb2_reqbufs(&vfh->queue, rb);
 891         mutex_unlock(&video->queue_lock);
 892
 893         return ret;
 894 }
 895
 896 static int
 897 isp_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
 898 {
 899         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 900         struct isp_video *video = video_drvdata(file);
 901         int ret;
 902
 903         mutex_lock(&video->queue_lock);
 904         ret = vb2_querybuf(&vfh->queue, b);
 905         mutex_unlock(&video->queue_lock);
 906
 907         return ret;
 908 }
 909
 910 static int
 911 isp_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 912 {
 913         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 914         struct isp_video *video = video_drvdata(file);
 915         int ret;
 916
 917         mutex_lock(&video->queue_lock);
 918         ret = vb2_qbuf(&vfh->queue, b);
 919         mutex_unlock(&video->queue_lock);
 920
 921         return ret;
 922 }
 923
 924 static int
 925 isp_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 926 {
 927         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 928         struct isp_video *video = video_drvdata(file);
 929         int ret;
 930
 931         mutex_lock(&video->queue_lock);
 932         ret = vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
 933         mutex_unlock(&video->queue_lock);
 934
 935         return ret;
 936 }
 937
 938 static int isp_video_check_external_subdevs(struct isp_video *video,
 939                                             struct isp_pipeline *pipe)
 940 {
 941         struct isp_device *isp = video->isp;
 942         struct media_entity *ents[] = {
 943                 &isp->isp_csi2a.subdev.entity,
 944                 &isp->isp_csi2c.subdev.entity,
 945                 &isp->isp_ccp2.subdev.entity,
 946                 &isp->isp_ccdc.subdev.entity
 947         };
 948         struct media_pad *source_pad;
 949         struct media_entity *source = NULL;
 950         struct media_entity *sink;
 951         struct v4l2_subdev_format fmt;
 952         struct v4l2_ext_controls ctrls;
 953         struct v4l2_ext_control ctrl;
 954         unsigned int i;
 955         int ret;
 956
 957         /* Memory-to-memory pipelines have no external subdev. */
 958         if (pipe->input != NULL)
 959                 return 0;
 960
 961         for (i = 0; i < ARRAY_SIZE(ents); i++) {
 962                 /* Is the entity part of the pipeline? */
 963                 if (!media_entity_enum_test(&pipe->ent_enum, ents[i]))
 964                         continue;
 965
 966                 /* ISP entities have always sink pad == 0. Find source. */
 967                 source_pad = media_entity_remote_pad(&ents[i]->pads[0]);
 968                 if (source_pad == NULL)
 969                         continue;
 970
 971                 source = source_pad->entity;
 972                 sink = ents[i];
 973                 break;
 974         }
 975
 976         if (!source) {
 977                 dev_warn(isp->dev, "can't find source, failing now\n");
 978                 return -EINVAL;
 979         }
 980
 981         if (!is_media_entity_v4l2_subdev(source))
 982                 return 0;
 983
 984         pipe->external = media_entity_to_v4l2_subdev(source);
 985
 986         fmt.pad = source_pad->index;
 987         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 988         ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(sink),
 989                                pad, get_fmt, NULL, &fmt);
 990         if (unlikely(ret < 0)) {
 991                 dev_warn(isp->dev, "get_fmt returned null!\n");
 992                 return ret;
 993         }
 994
 995         pipe->external_width =
 996                 omap3isp_video_format_info(fmt.format.code)->width;
 997
 998         memset(&ctrls, 0, sizeof(ctrls));
 999         memset(&ctrl, 0, sizeof(ctrl));
1000
1001         ctrl.id = V4L2_CID_PIXEL_RATE;
1002
1003         ctrls.count = 1;
1004         ctrls.controls = &ctrl;
1005
1006         ret = v4l2_g_ext_ctrls(pipe->external->ctrl_handler, &ctrls);
1007         if (ret < 0) {
1008                 dev_warn(isp->dev, "no pixel rate control in subdev %s\n",
1009                          pipe->external->name);
1010                 return ret;
1011         }
1012
1013         pipe->external_rate = ctrl.value64;
1014
1015         if (media_entity_enum_test(&pipe->ent_enum,
1016                                    &isp->isp_ccdc.subdev.entity)) {
1017                 unsigned int rate = UINT_MAX;
1018                 /*
1019                  * Check that maximum allowed CCDC pixel rate isn't
1020                  * exceeded by the pixel rate.
1021                  */
1022                 omap3isp_ccdc_max_rate(&isp->isp_ccdc, &rate);
1023                 if (pipe->external_rate > rate)
1024                         return -ENOSPC;
1025         }
1026
1027         return 0;
1028 }
1029
1030 /*
1031  * Stream management
1032  *
1033  * Every ISP pipeline has a single input and a single output. The input can be
1034  * either a sensor or a video node. The output is always a video node.
1035  *
1036  * As every pipeline has an output video node, the ISP video objects at the
1037  * pipeline output stores the pipeline state. It tracks the streaming state of
1038  * both the input and output, as well as the availability of buffers.
1039  *
1040  * In sensor-to-memory mode, frames are always available at the pipeline input.
1041  * Starting the sensor usually requires I2C transfers and must be done in
1042  * interruptible context. The pipeline is started and stopped synchronously
1043  * to the stream on/off commands. All modules in the pipeline will get their
1044  * subdev set stream handler called. The module at the end of the pipeline must
1045  * delay starting the hardware until buffers are available at its output.
1046  *
1047  * In memory-to-memory mode, starting/stopping the stream requires
1048  * synchronization between the input and output. ISP modules can't be stopped
1049  * in the middle of a frame, and at least some of the modules seem to become
1050  * busy as soon as they're started, even if they don't receive a frame start
1051  * event. For that reason frames need to be processed in single-shot mode. The
1052  * driver needs to wait until a frame is completely processed and written to
1053  * memory before restarting the pipeline for the next frame. Pipelined
1054  * processing might be possible but requires more testing.
1055  *
1056  * Stream start must be delayed until buffers are available at both the input
1057  * and output. The pipeline must be started in the videobuf queue callback with
1058  * the buffers queue spinlock held. The modules subdev set stream operation must
1059  * not sleep.
1060  */
1061 static int
1062 isp_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
1063 {
1064         struct isp_video_fh *vfh = to_isp_video_fh(fh);
1065         struct isp_video *video = video_drvdata(file);
1066         enum isp_pipeline_state state;
1067         struct isp_pipeline *pipe;
1068         unsigned long flags;
1069         int ret;
1070
1071         if (type != video->type)
1072                 return -EINVAL;
1073
1074         mutex_lock(&video->stream_lock);
1075
1076         /* Start streaming on the pipeline. No link touching an entity in the
1077          * pipeline can be activated or deactivated once streaming is started.
1078          */
1079         pipe = video->video.entity.pipe
1080              ? to_isp_pipeline(&video->video.entity) : &video->pipe;
1081
1082         ret = media_entity_enum_init(&pipe->ent_enum, &video->isp->media_dev);
1083         if (ret)
1084                 goto err_enum_init;
1085
1086         /* TODO: Implement PM QoS */
1087         pipe->l3_ick = clk_get_rate(video->isp->clock[ISP_CLK_L3_ICK]);
1088         pipe->max_rate = pipe->l3_ick;
1089
1090         ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
1091         if (ret < 0)
1092                 goto err_pipeline_start;
1093
1094         /* Verify that the currently configured format matches the output of
1095          * the connected subdev.
1096          */
1097         ret = isp_video_check_format(video, vfh);
1098         if (ret < 0)
1099                 goto err_check_format;
1100
1101         video->bpl_padding = ret;
1102         video->bpl_value = vfh->format.fmt.pix.bytesperline;
1103
1104         ret = isp_video_get_graph_data(video, pipe);
1105         if (ret < 0)
1106                 goto err_check_format;
1107
1108         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1109                 state = ISP_PIPELINE_STREAM_OUTPUT | ISP_PIPELINE_IDLE_OUTPUT;
1110         else
1111                 state = ISP_PIPELINE_STREAM_INPUT | ISP_PIPELINE_IDLE_INPUT;
1112
1113         ret = isp_video_check_external_subdevs(video, pipe);
1114         if (ret < 0)
1115                 goto err_check_format;
1116
1117         pipe->error = false;
1118
1119         spin_lock_irqsave(&pipe->lock, flags);
1120         pipe->state &= ~ISP_PIPELINE_STREAM;
1121         pipe->state |= state;
1122         spin_unlock_irqrestore(&pipe->lock, flags);
1123
1124         /* Set the maximum time per frame as the value requested by userspace.
1125          * This is a soft limit that can be overridden if the hardware doesn't
1126          * support the request limit.
1127          */
1128         if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1129                 pipe->max_timeperframe = vfh->timeperframe;
1130
1131         video->queue = &vfh->queue;
1132         INIT_LIST_HEAD(&video->dmaqueue);
1133         atomic_set(&pipe->frame_number, -1);
1134         pipe->field = vfh->format.fmt.pix.field;
1135
1136         mutex_lock(&video->queue_lock);
1137         ret = vb2_streamon(&vfh->queue, type);
1138         mutex_unlock(&video->queue_lock);
1139         if (ret < 0)
1140                 goto err_check_format;
1141
1142         mutex_unlock(&video->stream_lock);
1143
1144         return 0;
1145
1146 err_check_format:
1147         media_entity_pipeline_stop(&video->video.entity);
1148 err_pipeline_start:
1149         /* TODO: Implement PM QoS */
1150         /* The DMA queue must be emptied here, otherwise CCDC interrupts that
1151          * will get triggered the next time the CCDC is powered up will try to
1152          * access buffers that might have been freed but still present in the
1153          * DMA queue. This can easily get triggered if the above
1154          * omap3isp_pipeline_set_stream() call fails on a system with a
1155          * free-running sensor.
1156          */
1157         INIT_LIST_HEAD(&video->dmaqueue);
1158         video->queue = NULL;
1159
1160         media_entity_enum_cleanup(&pipe->ent_enum);
1161
1162 err_enum_init:
1163         mutex_unlock(&video->stream_lock);
1164
1165         return ret;
1166 }
1167
1168 static int
1169 isp_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
1170 {
1171         struct isp_video_fh *vfh = to_isp_video_fh(fh);
1172         struct isp_video *video = video_drvdata(file);
1173         struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
1174         enum isp_pipeline_state state;
1175         unsigned int streaming;
1176         unsigned long flags;
1177
1178         if (type != video->type)
1179                 return -EINVAL;
1180
1181         mutex_lock(&video->stream_lock);
1182
1183         /* Make sure we're not streaming yet. */
1184         mutex_lock(&video->queue_lock);
1185         streaming = vb2_is_streaming(&vfh->queue);
1186         mutex_unlock(&video->queue_lock);
1187
1188         if (!streaming)
1189                 goto done;
1190
1191         /* Update the pipeline state. */
1192         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1193                 state = ISP_PIPELINE_STREAM_OUTPUT
1194                       | ISP_PIPELINE_QUEUE_OUTPUT;
1195         else
1196                 state = ISP_PIPELINE_STREAM_INPUT
1197                       | ISP_PIPELINE_QUEUE_INPUT;
1198
1199         spin_lock_irqsave(&pipe->lock, flags);
1200         pipe->state &= ~state;
1201         spin_unlock_irqrestore(&pipe->lock, flags);
1202
1203         /* Stop the stream. */
1204         omap3isp_pipeline_set_stream(pipe, ISP_PIPELINE_STREAM_STOPPED);
1205         omap3isp_video_cancel_stream(video);
1206
1207         mutex_lock(&video->queue_lock);
1208         vb2_streamoff(&vfh->queue, type);
1209         mutex_unlock(&video->queue_lock);
1210         video->queue = NULL;
1211         video->error = false;
1212
1213         /* TODO: Implement PM QoS */
1214         media_entity_pipeline_stop(&video->video.entity);
1215
1216         media_entity_enum_cleanup(&pipe->ent_enum);
1217
1218 done:
1219         mutex_unlock(&video->stream_lock);
1220         return 0;
1221 }
1222
1223 static int
1224 isp_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
1225 {
1226         if (input->index > 0)
1227                 return -EINVAL;
1228
1229         strlcpy(input->name, "camera", sizeof(input->name));
1230         input->type = V4L2_INPUT_TYPE_CAMERA;
1231
1232         return 0;
1233 }
1234
1235 static int
1236 isp_video_g_input(struct file *file, void *fh, unsigned int *input)
1237 {
1238         *input = 0;
1239
1240         return 0;
1241 }
1242
1243 static int
1244 isp_video_s_input(struct file *file, void *fh, unsigned int input)
1245 {
1246         return input == 0 ? 0 : -EINVAL;
1247 }
1248
1249 static const struct v4l2_ioctl_ops isp_video_ioctl_ops = {
1250         .vidioc_querycap                = isp_video_querycap,
1251         .vidioc_g_fmt_vid_cap           = isp_video_get_format,
1252         .vidioc_s_fmt_vid_cap           = isp_video_set_format,
1253         .vidioc_try_fmt_vid_cap         = isp_video_try_format,
1254         .vidioc_g_fmt_vid_out           = isp_video_get_format,
1255         .vidioc_s_fmt_vid_out           = isp_video_set_format,
1256         .vidioc_try_fmt_vid_out         = isp_video_try_format,
1257         .vidioc_cropcap                 = isp_video_cropcap,
1258         .vidioc_g_crop                  = isp_video_get_crop,
1259         .vidioc_s_crop                  = isp_video_set_crop,
1260         .vidioc_g_parm                  = isp_video_get_param,
1261         .vidioc_s_parm                  = isp_video_set_param,
1262         .vidioc_reqbufs                 = isp_video_reqbufs,
1263         .vidioc_querybuf                = isp_video_querybuf,
1264         .vidioc_qbuf                    = isp_video_qbuf,
1265         .vidioc_dqbuf                   = isp_video_dqbuf,
1266         .vidioc_streamon                = isp_video_streamon,
1267         .vidioc_streamoff               = isp_video_streamoff,
1268         .vidioc_enum_input              = isp_video_enum_input,
1269         .vidioc_g_input                 = isp_video_g_input,
1270         .vidioc_s_input                 = isp_video_s_input,
1271 };
1272
1273 /* -----------------------------------------------------------------------------
1274  * V4L2 file operations
1275  */
1276
1277 static int isp_video_open(struct file *file)
1278 {
1279         struct isp_video *video = video_drvdata(file);
1280         struct isp_video_fh *handle;
1281         struct vb2_queue *queue;
1282         int ret = 0;
1283
1284         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
1285         if (handle == NULL)
1286                 return -ENOMEM;
1287
1288         v4l2_fh_init(&handle->vfh, &video->video);
1289         v4l2_fh_add(&handle->vfh);
1290
1291         /* If this is the first user, initialise the pipeline. */
1292         if (omap3isp_get(video->isp) == NULL) {
1293                 ret = -EBUSY;
1294                 goto done;
1295         }
1296
1297         ret = v4l2_pipeline_pm_use(&video->video.entity, 1);
1298         if (ret < 0) {
1299                 omap3isp_put(video->isp);
1300                 goto done;
1301         }
1302
1303         queue = &handle->queue;
1304         queue->type = video->type;
1305         queue->io_modes = VB2_MMAP | VB2_USERPTR;
1306         queue->drv_priv = handle;
1307         queue->ops = &isp_video_queue_ops;
1308         queue->mem_ops = &vb2_dma_contig_memops;
1309         queue->buf_struct_size = sizeof(struct isp_buffer);
1310         queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1311
1312         ret = vb2_queue_init(&handle->queue);
1313         if (ret < 0) {
1314                 omap3isp_put(video->isp);
1315                 goto done;
1316         }
1317
1318         memset(&handle->format, 0, sizeof(handle->format));
1319         handle->format.type = video->type;
1320         handle->timeperframe.denominator = 1;
1321
1322         handle->video = video;
1323         file->private_data = &handle->vfh;
1324
1325 done:
1326         if (ret < 0) {
1327                 v4l2_fh_del(&handle->vfh);
1328                 kfree(handle);
1329         }
1330
1331         return ret;
1332 }
1333
1334 static int isp_video_release(struct file *file)
1335 {
1336         struct isp_video *video = video_drvdata(file);
1337         struct v4l2_fh *vfh = file->private_data;
1338         struct isp_video_fh *handle = to_isp_video_fh(vfh);
1339
1340         /* Disable streaming and free the buffers queue resources. */
1341         isp_video_streamoff(file, vfh, video->type);
1342
1343         mutex_lock(&video->queue_lock);
1344         vb2_queue_release(&handle->queue);
1345         mutex_unlock(&video->queue_lock);
1346
1347         v4l2_pipeline_pm_use(&video->video.entity, 0);
1348
1349         /* Release the file handle. */
1350         v4l2_fh_del(vfh);
1351         kfree(handle);
1352         file->private_data = NULL;
1353
1354         omap3isp_put(video->isp);
1355
1356         return 0;
1357 }
1358
1359 static unsigned int isp_video_poll(struct file *file, poll_table *wait)
1360 {
1361         struct isp_video_fh *vfh = to_isp_video_fh(file->private_data);
1362         struct isp_video *video = video_drvdata(file);
1363         int ret;
1364
1365         mutex_lock(&video->queue_lock);
1366         ret = vb2_poll(&vfh->queue, file, wait);
1367         mutex_unlock(&video->queue_lock);
1368
1369         return ret;
1370 }
1371
1372 static int isp_video_mmap(struct file *file, struct vm_area_struct *vma)
1373 {
1374         struct isp_video_fh *vfh = to_isp_video_fh(file->private_data);
1375
1376         return vb2_mmap(&vfh->queue, vma);
1377 }
1378
1379 static struct v4l2_file_operations isp_video_fops = {
1380         .owner = THIS_MODULE,
1381         .unlocked_ioctl = video_ioctl2,
1382         .open = isp_video_open,
1383         .release = isp_video_release,
1384         .poll = isp_video_poll,
1385         .mmap = isp_video_mmap,
1386 };
1387
1388 /* -----------------------------------------------------------------------------
1389  * ISP video core
1390  */
1391
1392 static const struct isp_video_operations isp_video_dummy_ops = {
1393 };
1394
1395 int omap3isp_video_init(struct isp_video *video, const char *name)
1396 {
1397         const char *direction;
1398         int ret;
1399
1400         switch (video->type) {
1401         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1402                 direction = "output";
1403                 video->pad.flags = MEDIA_PAD_FL_SINK
1404                                    | MEDIA_PAD_FL_MUST_CONNECT;
1405                 break;
1406         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1407                 direction = "input";
1408                 video->pad.flags = MEDIA_PAD_FL_SOURCE
1409                                    | MEDIA_PAD_FL_MUST_CONNECT;
1410                 video->video.vfl_dir = VFL_DIR_TX;
1411                 break;
1412
1413         default:
1414                 return -EINVAL;
1415         }
1416
1417         video->alloc_ctx = vb2_dma_contig_init_ctx(video->isp->dev);
1418         if (IS_ERR(video->alloc_ctx))
1419                 return PTR_ERR(video->alloc_ctx);
1420
1421         ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
1422         if (ret < 0) {
1423                 vb2_dma_contig_cleanup_ctx(video->alloc_ctx);
1424                 return ret;
1425         }
1426
1427         mutex_init(&video->mutex);
1428         atomic_set(&video->active, 0);
1429
1430         spin_lock_init(&video->pipe.lock);
1431         mutex_init(&video->stream_lock);
1432         mutex_init(&video->queue_lock);
1433         spin_lock_init(&video->irqlock);
1434
1435         /* Initialize the video device. */
1436         if (video->ops == NULL)
1437                 video->ops = &isp_video_dummy_ops;
1438
1439         video->video.fops = &isp_video_fops;
1440         snprintf(video->video.name, sizeof(video->video.name),
1441                  "OMAP3 ISP %s %s", name, direction);
1442         video->video.vfl_type = VFL_TYPE_GRABBER;
1443         video->video.release = video_device_release_empty;
1444         video->video.ioctl_ops = &isp_video_ioctl_ops;
1445         video->pipe.stream_state = ISP_PIPELINE_STREAM_STOPPED;
1446
1447         video_set_drvdata(&video->video, video);
1448
1449         return 0;
1450 }
1451
1452 void omap3isp_video_cleanup(struct isp_video *video)
1453 {
1454         vb2_dma_contig_cleanup_ctx(video->alloc_ctx);
1455         media_entity_cleanup(&video->video.entity);
1456         mutex_destroy(&video->queue_lock);
1457         mutex_destroy(&video->stream_lock);
1458         mutex_destroy(&video->mutex);
1459 }
1460
1461 int omap3isp_video_register(struct isp_video *video, struct v4l2_device *vdev)
1462 {
1463         int ret;
1464
1465         video->video.v4l2_dev = vdev;
1466
1467         ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1468         if (ret < 0)
1469                 dev_err(video->isp->dev,
1470                         "%s: could not register video device (%d)\n",
1471                         __func__, ret);
1472
1473         return ret;
1474 }
1475
1476 void omap3isp_video_unregister(struct isp_video *video)
1477 {
1478         if (video_is_registered(&video->video))
1479                 video_unregister_device(&video->video);
1480 }