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_video_device(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[], struct device *alloc_devs[])
 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         *count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
 346
 347         return 0;
 348 }
 349
 350 static int isp_video_buffer_prepare(struct vb2_buffer *buf)
 351 {
 352         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(buf);
 353         struct isp_video_fh *vfh = vb2_get_drv_priv(buf->vb2_queue);
 354         struct isp_buffer *buffer = to_isp_buffer(vbuf);
 355         struct isp_video *video = vfh->video;
 356         dma_addr_t addr;
 357
 358         /* Refuse to prepare the buffer is the video node has registered an
 359          * error. We don't need to take any lock here as the operation is
 360          * inherently racy. The authoritative check will be performed in the
 361          * queue handler, which can't return an error, this check is just a best
 362          * effort to notify userspace as early as possible.
 363          */
 364         if (unlikely(video->error))
 365                 return -EIO;
 366
 367         addr = vb2_dma_contig_plane_dma_addr(buf, 0);
 368         if (!IS_ALIGNED(addr, 32)) {
 369                 dev_dbg(video->isp->dev,
 370                         "Buffer address must be aligned to 32 bytes boundary.\n");
 371                 return -EINVAL;
 372         }
 373
 374         vb2_set_plane_payload(&buffer->vb.vb2_buf, 0,
 375                               vfh->format.fmt.pix.sizeimage);
 376         buffer->dma = addr;
 377
 378         return 0;
 379 }
 380
 381 /*
 382  * isp_video_buffer_queue - Add buffer to streaming queue
 383  * @buf: Video buffer
 384  *
 385  * In memory-to-memory mode, start streaming on the pipeline if buffers are
 386  * queued on both the input and the output, if the pipeline isn't already busy.
 387  * If the pipeline is busy, it will be restarted in the output module interrupt
 388  * handler.
 389  */
 390 static void isp_video_buffer_queue(struct vb2_buffer *buf)
 391 {
 392         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(buf);
 393         struct isp_video_fh *vfh = vb2_get_drv_priv(buf->vb2_queue);
 394         struct isp_buffer *buffer = to_isp_buffer(vbuf);
 395         struct isp_video *video = vfh->video;
 396         struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
 397         enum isp_pipeline_state state;
 398         unsigned long flags;
 399         unsigned int empty;
 400         unsigned int start;
 401
 402         spin_lock_irqsave(&video->irqlock, flags);
 403
 404         if (unlikely(video->error)) {
 405                 vb2_buffer_done(&buffer->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 406                 spin_unlock_irqrestore(&video->irqlock, flags);
 407                 return;
 408         }
 409
 410         empty = list_empty(&video->dmaqueue);
 411         list_add_tail(&buffer->irqlist, &video->dmaqueue);
 412
 413         spin_unlock_irqrestore(&video->irqlock, flags);
 414
 415         if (empty) {
 416                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 417                         state = ISP_PIPELINE_QUEUE_OUTPUT;
 418                 else
 419                         state = ISP_PIPELINE_QUEUE_INPUT;
 420
 421                 spin_lock_irqsave(&pipe->lock, flags);
 422                 pipe->state |= state;
 423                 video->ops->queue(video, buffer);
 424                 video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;
 425
 426                 start = isp_pipeline_ready(pipe);
 427                 if (start)
 428                         pipe->state |= ISP_PIPELINE_STREAM;
 429                 spin_unlock_irqrestore(&pipe->lock, flags);
 430
 431                 if (start)
 432                         omap3isp_pipeline_set_stream(pipe,
 433                                                 ISP_PIPELINE_STREAM_SINGLESHOT);
 434         }
 435 }
 436
 437 /*
 438  * omap3isp_video_return_buffers - Return all queued buffers to videobuf2
 439  * @video: ISP video object
 440  * @state: new state for the returned buffers
 441  *
 442  * Return all buffers queued on the video node to videobuf2 in the given state.
 443  * The buffer state should be VB2_BUF_STATE_QUEUED if called due to an error
 444  * when starting the stream, or VB2_BUF_STATE_ERROR otherwise.
 445  *
 446  * The function must be called with the video irqlock held.
 447  */
 448 static void omap3isp_video_return_buffers(struct isp_video *video,
 449                                           enum vb2_buffer_state state)
 450 {
 451         while (!list_empty(&video->dmaqueue)) {
 452                 struct isp_buffer *buf;
 453
 454                 buf = list_first_entry(&video->dmaqueue,
 455                                        struct isp_buffer, irqlist);
 456                 list_del(&buf->irqlist);
 457                 vb2_buffer_done(&buf->vb.vb2_buf, state);
 458         }
 459 }
 460
 461 static int isp_video_start_streaming(struct vb2_queue *queue,
 462                                      unsigned int count)
 463 {
 464         struct isp_video_fh *vfh = vb2_get_drv_priv(queue);
 465         struct isp_video *video = vfh->video;
 466         struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
 467         unsigned long flags;
 468         int ret;
 469
 470         /* In sensor-to-memory mode, the stream can be started synchronously
 471          * to the stream on command. In memory-to-memory mode, it will be
 472          * started when buffers are queued on both the input and output.
 473          */
 474         if (pipe->input)
 475                 return 0;
 476
 477         ret = omap3isp_pipeline_set_stream(pipe,
 478                                            ISP_PIPELINE_STREAM_CONTINUOUS);
 479         if (ret < 0) {
 480                 spin_lock_irqsave(&video->irqlock, flags);
 481                 omap3isp_video_return_buffers(video, VB2_BUF_STATE_QUEUED);
 482                 spin_unlock_irqrestore(&video->irqlock, flags);
 483                 return ret;
 484         }
 485
 486         spin_lock_irqsave(&video->irqlock, flags);
 487         if (list_empty(&video->dmaqueue))
 488                 video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
 489         spin_unlock_irqrestore(&video->irqlock, flags);
 490
 491         return 0;
 492 }
 493
 494 static const struct vb2_ops isp_video_queue_ops = {
 495         .queue_setup = isp_video_queue_setup,
 496         .buf_prepare = isp_video_buffer_prepare,
 497         .buf_queue = isp_video_buffer_queue,
 498         .start_streaming = isp_video_start_streaming,
 499 };
 500
 501 /*
 502  * omap3isp_video_buffer_next - Complete the current buffer and return the next
 503  * @video: ISP video object
 504  *
 505  * Remove the current video buffer from the DMA queue and fill its timestamp and
 506  * field count before handing it back to videobuf2.
 507  *
 508  * For capture video nodes the buffer state is set to VB2_BUF_STATE_DONE if no
 509  * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
 510  * For video output nodes the buffer state is always set to VB2_BUF_STATE_DONE.
 511  *
 512  * The DMA queue is expected to contain at least one buffer.
 513  *
 514  * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
 515  * empty.
 516  */
 517 struct isp_buffer *omap3isp_video_buffer_next(struct isp_video *video)
 518 {
 519         struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
 520         enum vb2_buffer_state vb_state;
 521         struct isp_buffer *buf;
 522         unsigned long flags;
 523
 524         spin_lock_irqsave(&video->irqlock, flags);
 525         if (WARN_ON(list_empty(&video->dmaqueue))) {
 526                 spin_unlock_irqrestore(&video->irqlock, flags);
 527                 return NULL;
 528         }
 529
 530         buf = list_first_entry(&video->dmaqueue, struct isp_buffer,
 531                                irqlist);
 532         list_del(&buf->irqlist);
 533         spin_unlock_irqrestore(&video->irqlock, flags);
 534
 535         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 536
 537         /* Do frame number propagation only if this is the output video node.
 538          * Frame number either comes from the CSI receivers or it gets
 539          * incremented here if H3A is not active.
 540          * Note: There is no guarantee that the output buffer will finish
 541          * first, so the input number might lag behind by 1 in some cases.
 542          */
 543         if (video == pipe->output && !pipe->do_propagation)
 544                 buf->vb.sequence =
 545                         atomic_inc_return(&pipe->frame_number);
 546         else
 547                 buf->vb.sequence = atomic_read(&pipe->frame_number);
 548
 549         if (pipe->field != V4L2_FIELD_NONE)
 550                 buf->vb.sequence /= 2;
 551
 552         buf->vb.field = pipe->field;
 553
 554         /* Report pipeline errors to userspace on the capture device side. */
 555         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->error) {
 556                 vb_state = VB2_BUF_STATE_ERROR;
 557                 pipe->error = false;
 558         } else {
 559                 vb_state = VB2_BUF_STATE_DONE;
 560         }
 561
 562         vb2_buffer_done(&buf->vb.vb2_buf, vb_state);
 563
 564         spin_lock_irqsave(&video->irqlock, flags);
 565
 566         if (list_empty(&video->dmaqueue)) {
 567                 enum isp_pipeline_state state;
 568
 569                 spin_unlock_irqrestore(&video->irqlock, flags);
 570
 571                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 572                         state = ISP_PIPELINE_QUEUE_OUTPUT
 573                               | ISP_PIPELINE_STREAM;
 574                 else
 575                         state = ISP_PIPELINE_QUEUE_INPUT
 576                               | ISP_PIPELINE_STREAM;
 577
 578                 spin_lock_irqsave(&pipe->lock, flags);
 579                 pipe->state &= ~state;
 580                 if (video->pipe.stream_state == ISP_PIPELINE_STREAM_CONTINUOUS)
 581                         video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
 582                 spin_unlock_irqrestore(&pipe->lock, flags);
 583                 return NULL;
 584         }
 585
 586         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
 587                 spin_lock(&pipe->lock);
 588                 pipe->state &= ~ISP_PIPELINE_STREAM;
 589                 spin_unlock(&pipe->lock);
 590         }
 591
 592         buf = list_first_entry(&video->dmaqueue, struct isp_buffer,
 593                                irqlist);
 594
 595         spin_unlock_irqrestore(&video->irqlock, flags);
 596
 597         return buf;
 598 }
 599
 600 /*
 601  * omap3isp_video_cancel_stream - Cancel stream on a video node
 602  * @video: ISP video object
 603  *
 604  * Cancelling a stream returns all buffers queued on the video node to videobuf2
 605  * in the erroneous state and makes sure no new buffer can be queued.
 606  */
 607 void omap3isp_video_cancel_stream(struct isp_video *video)
 608 {
 609         unsigned long flags;
 610
 611         spin_lock_irqsave(&video->irqlock, flags);
 612         omap3isp_video_return_buffers(video, VB2_BUF_STATE_ERROR);
 613         video->error = true;
 614         spin_unlock_irqrestore(&video->irqlock, flags);
 615 }
 616
 617 /*
 618  * omap3isp_video_resume - Perform resume operation on the buffers
 619  * @video: ISP video object
 620  * @continuous: Pipeline is in single shot mode if 0 or continuous mode otherwise
 621  *
 622  * This function is intended to be used on suspend/resume scenario. It
 623  * requests video queue layer to discard buffers marked as DONE if it's in
 624  * continuous mode and requests ISP modules to queue again the ACTIVE buffer
 625  * if there's any.
 626  */
 627 void omap3isp_video_resume(struct isp_video *video, int continuous)
 628 {
 629         struct isp_buffer *buf = NULL;
 630
 631         if (continuous && video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 632                 mutex_lock(&video->queue_lock);
 633                 vb2_discard_done(video->queue);
 634                 mutex_unlock(&video->queue_lock);
 635         }
 636
 637         if (!list_empty(&video->dmaqueue)) {
 638                 buf = list_first_entry(&video->dmaqueue,
 639                                        struct isp_buffer, irqlist);
 640                 video->ops->queue(video, buf);
 641                 video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;
 642         } else {
 643                 if (continuous)
 644                         video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
 645         }
 646 }
 647
 648 /* -----------------------------------------------------------------------------
 649  * V4L2 ioctls
 650  */
 651
 652 static int
 653 isp_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 654 {
 655         struct isp_video *video = video_drvdata(file);
 656
 657         strlcpy(cap->driver, ISP_VIDEO_DRIVER_NAME, sizeof(cap->driver));
 658         strlcpy(cap->card, video->video.name, sizeof(cap->card));
 659         strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
 660
 661         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
 662                 | V4L2_CAP_STREAMING | V4L2_CAP_DEVICE_CAPS;
 663
 664         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 665                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 666         else
 667                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 668
 669         return 0;
 670 }
 671
 672 static int
 673 isp_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
 674 {
 675         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 676         struct isp_video *video = video_drvdata(file);
 677
 678         if (format->type != video->type)
 679                 return -EINVAL;
 680
 681         mutex_lock(&video->mutex);
 682         *format = vfh->format;
 683         mutex_unlock(&video->mutex);
 684
 685         return 0;
 686 }
 687
 688 static int
 689 isp_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
 690 {
 691         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 692         struct isp_video *video = video_drvdata(file);
 693         struct v4l2_mbus_framefmt fmt;
 694
 695         if (format->type != video->type)
 696                 return -EINVAL;
 697
 698         /* Replace unsupported field orders with sane defaults. */
 699         switch (format->fmt.pix.field) {
 700         case V4L2_FIELD_NONE:
 701                 /* Progressive is supported everywhere. */
 702                 break;
 703         case V4L2_FIELD_ALTERNATE:
 704                 /* ALTERNATE is not supported on output nodes. */
 705                 if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 706                         format->fmt.pix.field = V4L2_FIELD_NONE;
 707                 break;
 708         case V4L2_FIELD_INTERLACED:
 709                 /* The ISP has no concept of video standard, select the
 710                  * top-bottom order when the unqualified interlaced order is
 711                  * requested.
 712                  */
 713                 format->fmt.pix.field = V4L2_FIELD_INTERLACED_TB;
 714                 /* Fall-through */
 715         case V4L2_FIELD_INTERLACED_TB:
 716         case V4L2_FIELD_INTERLACED_BT:
 717                 /* Interlaced orders are only supported at the CCDC output. */
 718                 if (video != &video->isp->isp_ccdc.video_out)
 719                         format->fmt.pix.field = V4L2_FIELD_NONE;
 720                 break;
 721         case V4L2_FIELD_TOP:
 722         case V4L2_FIELD_BOTTOM:
 723         case V4L2_FIELD_SEQ_TB:
 724         case V4L2_FIELD_SEQ_BT:
 725         default:
 726                 /* All other field orders are currently unsupported, default to
 727                  * progressive.
 728                  */
 729                 format->fmt.pix.field = V4L2_FIELD_NONE;
 730                 break;
 731         }
 732
 733         /* Fill the bytesperline and sizeimage fields by converting to media bus
 734          * format and back to pixel format.
 735          */
 736         isp_video_pix_to_mbus(&format->fmt.pix, &fmt);
 737         isp_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
 738
 739         mutex_lock(&video->mutex);
 740         vfh->format = *format;
 741         mutex_unlock(&video->mutex);
 742
 743         return 0;
 744 }
 745
 746 static int
 747 isp_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
 748 {
 749         struct isp_video *video = video_drvdata(file);
 750         struct v4l2_subdev_format fmt;
 751         struct v4l2_subdev *subdev;
 752         u32 pad;
 753         int ret;
 754
 755         if (format->type != video->type)
 756                 return -EINVAL;
 757
 758         subdev = isp_video_remote_subdev(video, &pad);
 759         if (subdev == NULL)
 760                 return -EINVAL;
 761
 762         isp_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
 763
 764         fmt.pad = pad;
 765         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 766         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 767         if (ret)
 768                 return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 769
 770         isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
 771         return 0;
 772 }
 773
 774 static int
 775 isp_video_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropcap)
 776 {
 777         struct isp_video *video = video_drvdata(file);
 778         struct v4l2_subdev *subdev;
 779         int ret;
 780
 781         subdev = isp_video_remote_subdev(video, NULL);
 782         if (subdev == NULL)
 783                 return -EINVAL;
 784
 785         mutex_lock(&video->mutex);
 786         ret = v4l2_subdev_call(subdev, video, cropcap, cropcap);
 787         mutex_unlock(&video->mutex);
 788
 789         return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 790 }
 791
 792 static int
 793 isp_video_get_crop(struct file *file, void *fh, struct v4l2_crop *crop)
 794 {
 795         struct isp_video *video = video_drvdata(file);
 796         struct v4l2_subdev_format format;
 797         struct v4l2_subdev *subdev;
 798         u32 pad;
 799         int ret;
 800
 801         subdev = isp_video_remote_subdev(video, &pad);
 802         if (subdev == NULL)
 803                 return -EINVAL;
 804
 805         /* Try the get crop operation first and fallback to get format if not
 806          * implemented.
 807          */
 808         ret = v4l2_subdev_call(subdev, video, g_crop, crop);
 809         if (ret != -ENOIOCTLCMD)
 810                 return ret;
 811
 812         format.pad = pad;
 813         format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 814         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
 815         if (ret < 0)
 816                 return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 817
 818         crop->c.left = 0;
 819         crop->c.top = 0;
 820         crop->c.width = format.format.width;
 821         crop->c.height = format.format.height;
 822
 823         return 0;
 824 }
 825
 826 static int
 827 isp_video_set_crop(struct file *file, void *fh, const struct v4l2_crop *crop)
 828 {
 829         struct isp_video *video = video_drvdata(file);
 830         struct v4l2_subdev *subdev;
 831         int ret;
 832
 833         subdev = isp_video_remote_subdev(video, NULL);
 834         if (subdev == NULL)
 835                 return -EINVAL;
 836
 837         mutex_lock(&video->mutex);
 838         ret = v4l2_subdev_call(subdev, video, s_crop, crop);
 839         mutex_unlock(&video->mutex);
 840
 841         return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 842 }
 843
 844 static int
 845 isp_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 846 {
 847         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 848         struct isp_video *video = video_drvdata(file);
 849
 850         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 851             video->type != a->type)
 852                 return -EINVAL;
 853
 854         memset(a, 0, sizeof(*a));
 855         a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 856         a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 857         a->parm.output.timeperframe = vfh->timeperframe;
 858
 859         return 0;
 860 }
 861
 862 static int
 863 isp_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 864 {
 865         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 866         struct isp_video *video = video_drvdata(file);
 867
 868         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 869             video->type != a->type)
 870                 return -EINVAL;
 871
 872         if (a->parm.output.timeperframe.denominator == 0)
 873                 a->parm.output.timeperframe.denominator = 1;
 874
 875         vfh->timeperframe = a->parm.output.timeperframe;
 876
 877         return 0;
 878 }
 879
 880 static int
 881 isp_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
 882 {
 883         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 884         struct isp_video *video = video_drvdata(file);
 885         int ret;
 886
 887         mutex_lock(&video->queue_lock);
 888         ret = vb2_reqbufs(&vfh->queue, rb);
 889         mutex_unlock(&video->queue_lock);
 890
 891         return ret;
 892 }
 893
 894 static int
 895 isp_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
 896 {
 897         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 898         struct isp_video *video = video_drvdata(file);
 899         int ret;
 900
 901         mutex_lock(&video->queue_lock);
 902         ret = vb2_querybuf(&vfh->queue, b);
 903         mutex_unlock(&video->queue_lock);
 904
 905         return ret;
 906 }
 907
 908 static int
 909 isp_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 910 {
 911         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 912         struct isp_video *video = video_drvdata(file);
 913         int ret;
 914
 915         mutex_lock(&video->queue_lock);
 916         ret = vb2_qbuf(&vfh->queue, b);
 917         mutex_unlock(&video->queue_lock);
 918
 919         return ret;
 920 }
 921
 922 static int
 923 isp_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 924 {
 925         struct isp_video_fh *vfh = to_isp_video_fh(fh);
 926         struct isp_video *video = video_drvdata(file);
 927         int ret;
 928
 929         mutex_lock(&video->queue_lock);
 930         ret = vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
 931         mutex_unlock(&video->queue_lock);
 932
 933         return ret;
 934 }
 935
 936 static int isp_video_check_external_subdevs(struct isp_video *video,
 937                                             struct isp_pipeline *pipe)
 938 {
 939         struct isp_device *isp = video->isp;
 940         struct media_entity *ents[] = {
 941                 &isp->isp_csi2a.subdev.entity,
 942                 &isp->isp_csi2c.subdev.entity,
 943                 &isp->isp_ccp2.subdev.entity,
 944                 &isp->isp_ccdc.subdev.entity
 945         };
 946         struct media_pad *source_pad;
 947         struct media_entity *source = NULL;
 948         struct media_entity *sink;
 949         struct v4l2_subdev_format fmt;
 950         struct v4l2_ext_controls ctrls;
 951         struct v4l2_ext_control ctrl;
 952         unsigned int i;
 953         int ret;
 954
 955         /* Memory-to-memory pipelines have no external subdev. */
 956         if (pipe->input != NULL)
 957                 return 0;
 958
 959         for (i = 0; i < ARRAY_SIZE(ents); i++) {
 960                 /* Is the entity part of the pipeline? */
 961                 if (!media_entity_enum_test(&pipe->ent_enum, ents[i]))
 962                         continue;
 963
 964                 /* ISP entities have always sink pad == 0. Find source. */
 965                 source_pad = media_entity_remote_pad(&ents[i]->pads[0]);
 966                 if (source_pad == NULL)
 967                         continue;
 968
 969                 source = source_pad->entity;
 970                 sink = ents[i];
 971                 break;
 972         }
 973
 974         if (!source) {
 975                 dev_warn(isp->dev, "can't find source, failing now\n");
 976                 return -EINVAL;
 977         }
 978
 979         if (!is_media_entity_v4l2_subdev(source))
 980                 return 0;
 981
 982         pipe->external = media_entity_to_v4l2_subdev(source);
 983
 984         fmt.pad = source_pad->index;
 985         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 986         ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(sink),
 987                                pad, get_fmt, NULL, &fmt);
 988         if (unlikely(ret < 0)) {
 989                 dev_warn(isp->dev, "get_fmt returned null!\n");
 990                 return ret;
 991         }
 992
 993         pipe->external_width =
 994                 omap3isp_video_format_info(fmt.format.code)->width;
 995
 996         memset(&ctrls, 0, sizeof(ctrls));
 997         memset(&ctrl, 0, sizeof(ctrl));
 998
 999         ctrl.id = V4L2_CID_PIXEL_RATE;
1000
1001         ctrls.count = 1;
1002         ctrls.controls = &ctrl;
1003
1004         ret = v4l2_g_ext_ctrls(pipe->external->ctrl_handler, &ctrls);
1005         if (ret < 0) {
1006                 dev_warn(isp->dev, "no pixel rate control in subdev %s\n",
1007                          pipe->external->name);
1008                 return ret;
1009         }
1010
1011         pipe->external_rate = ctrl.value64;
1012
1013         if (media_entity_enum_test(&pipe->ent_enum,
1014                                    &isp->isp_ccdc.subdev.entity)) {
1015                 unsigned int rate = UINT_MAX;
1016                 /*
1017                  * Check that maximum allowed CCDC pixel rate isn't
1018                  * exceeded by the pixel rate.
1019                  */
1020                 omap3isp_ccdc_max_rate(&isp->isp_ccdc, &rate);
1021                 if (pipe->external_rate > rate)
1022                         return -ENOSPC;
1023         }
1024
1025         return 0;
1026 }
1027
1028 /*
1029  * Stream management
1030  *
1031  * Every ISP pipeline has a single input and a single output. The input can be
1032  * either a sensor or a video node. The output is always a video node.
1033  *
1034  * As every pipeline has an output video node, the ISP video objects at the
1035  * pipeline output stores the pipeline state. It tracks the streaming state of
1036  * both the input and output, as well as the availability of buffers.
1037  *
1038  * In sensor-to-memory mode, frames are always available at the pipeline input.
1039  * Starting the sensor usually requires I2C transfers and must be done in
1040  * interruptible context. The pipeline is started and stopped synchronously
1041  * to the stream on/off commands. All modules in the pipeline will get their
1042  * subdev set stream handler called. The module at the end of the pipeline must
1043  * delay starting the hardware until buffers are available at its output.
1044  *
1045  * In memory-to-memory mode, starting/stopping the stream requires
1046  * synchronization between the input and output. ISP modules can't be stopped
1047  * in the middle of a frame, and at least some of the modules seem to become
1048  * busy as soon as they're started, even if they don't receive a frame start
1049  * event. For that reason frames need to be processed in single-shot mode. The
1050  * driver needs to wait until a frame is completely processed and written to
1051  * memory before restarting the pipeline for the next frame. Pipelined
1052  * processing might be possible but requires more testing.
1053  *
1054  * Stream start must be delayed until buffers are available at both the input
1055  * and output. The pipeline must be started in the videobuf queue callback with
1056  * the buffers queue spinlock held. The modules subdev set stream operation must
1057  * not sleep.
1058  */
1059 static int
1060 isp_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
1061 {
1062         struct isp_video_fh *vfh = to_isp_video_fh(fh);
1063         struct isp_video *video = video_drvdata(file);
1064         enum isp_pipeline_state state;
1065         struct isp_pipeline *pipe;
1066         unsigned long flags;
1067         int ret;
1068
1069         if (type != video->type)
1070                 return -EINVAL;
1071
1072         mutex_lock(&video->stream_lock);
1073
1074         /* Start streaming on the pipeline. No link touching an entity in the
1075          * pipeline can be activated or deactivated once streaming is started.
1076          */
1077         pipe = video->video.entity.pipe
1078              ? to_isp_pipeline(&video->video.entity) : &video->pipe;
1079
1080         ret = media_entity_enum_init(&pipe->ent_enum, &video->isp->media_dev);
1081         if (ret)
1082                 goto err_enum_init;
1083
1084         /* TODO: Implement PM QoS */
1085         pipe->l3_ick = clk_get_rate(video->isp->clock[ISP_CLK_L3_ICK]);
1086         pipe->max_rate = pipe->l3_ick;
1087
1088         ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
1089         if (ret < 0)
1090                 goto err_pipeline_start;
1091
1092         /* Verify that the currently configured format matches the output of
1093          * the connected subdev.
1094          */
1095         ret = isp_video_check_format(video, vfh);
1096         if (ret < 0)
1097                 goto err_check_format;
1098
1099         video->bpl_padding = ret;
1100         video->bpl_value = vfh->format.fmt.pix.bytesperline;
1101
1102         ret = isp_video_get_graph_data(video, pipe);
1103         if (ret < 0)
1104                 goto err_check_format;
1105
1106         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1107                 state = ISP_PIPELINE_STREAM_OUTPUT | ISP_PIPELINE_IDLE_OUTPUT;
1108         else
1109                 state = ISP_PIPELINE_STREAM_INPUT | ISP_PIPELINE_IDLE_INPUT;
1110
1111         ret = isp_video_check_external_subdevs(video, pipe);
1112         if (ret < 0)
1113                 goto err_check_format;
1114
1115         pipe->error = false;
1116
1117         spin_lock_irqsave(&pipe->lock, flags);
1118         pipe->state &= ~ISP_PIPELINE_STREAM;
1119         pipe->state |= state;
1120         spin_unlock_irqrestore(&pipe->lock, flags);
1121
1122         /* Set the maximum time per frame as the value requested by userspace.
1123          * This is a soft limit that can be overridden if the hardware doesn't
1124          * support the request limit.
1125          */
1126         if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1127                 pipe->max_timeperframe = vfh->timeperframe;
1128
1129         video->queue = &vfh->queue;
1130         INIT_LIST_HEAD(&video->dmaqueue);
1131         atomic_set(&pipe->frame_number, -1);
1132         pipe->field = vfh->format.fmt.pix.field;
1133
1134         mutex_lock(&video->queue_lock);
1135         ret = vb2_streamon(&vfh->queue, type);
1136         mutex_unlock(&video->queue_lock);
1137         if (ret < 0)
1138                 goto err_check_format;
1139
1140         mutex_unlock(&video->stream_lock);
1141
1142         return 0;
1143
1144 err_check_format:
1145         media_entity_pipeline_stop(&video->video.entity);
1146 err_pipeline_start:
1147         /* TODO: Implement PM QoS */
1148         /* The DMA queue must be emptied here, otherwise CCDC interrupts that
1149          * will get triggered the next time the CCDC is powered up will try to
1150          * access buffers that might have been freed but still present in the
1151          * DMA queue. This can easily get triggered if the above
1152          * omap3isp_pipeline_set_stream() call fails on a system with a
1153          * free-running sensor.
1154          */
1155         INIT_LIST_HEAD(&video->dmaqueue);
1156         video->queue = NULL;
1157
1158         media_entity_enum_cleanup(&pipe->ent_enum);
1159
1160 err_enum_init:
1161         mutex_unlock(&video->stream_lock);
1162
1163         return ret;
1164 }
1165
1166 static int
1167 isp_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
1168 {
1169         struct isp_video_fh *vfh = to_isp_video_fh(fh);
1170         struct isp_video *video = video_drvdata(file);
1171         struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
1172         enum isp_pipeline_state state;
1173         unsigned int streaming;
1174         unsigned long flags;
1175
1176         if (type != video->type)
1177                 return -EINVAL;
1178
1179         mutex_lock(&video->stream_lock);
1180
1181         /* Make sure we're not streaming yet. */
1182         mutex_lock(&video->queue_lock);
1183         streaming = vb2_is_streaming(&vfh->queue);
1184         mutex_unlock(&video->queue_lock);
1185
1186         if (!streaming)
1187                 goto done;
1188
1189         /* Update the pipeline state. */
1190         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1191                 state = ISP_PIPELINE_STREAM_OUTPUT
1192                       | ISP_PIPELINE_QUEUE_OUTPUT;
1193         else
1194                 state = ISP_PIPELINE_STREAM_INPUT
1195                       | ISP_PIPELINE_QUEUE_INPUT;
1196
1197         spin_lock_irqsave(&pipe->lock, flags);
1198         pipe->state &= ~state;
1199         spin_unlock_irqrestore(&pipe->lock, flags);
1200
1201         /* Stop the stream. */
1202         omap3isp_pipeline_set_stream(pipe, ISP_PIPELINE_STREAM_STOPPED);
1203         omap3isp_video_cancel_stream(video);
1204
1205         mutex_lock(&video->queue_lock);
1206         vb2_streamoff(&vfh->queue, type);
1207         mutex_unlock(&video->queue_lock);
1208         video->queue = NULL;
1209         video->error = false;
1210
1211         /* TODO: Implement PM QoS */
1212         media_entity_pipeline_stop(&video->video.entity);
1213
1214         media_entity_enum_cleanup(&pipe->ent_enum);
1215
1216 done:
1217         mutex_unlock(&video->stream_lock);
1218         return 0;
1219 }
1220
1221 static int
1222 isp_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
1223 {
1224         if (input->index > 0)
1225                 return -EINVAL;
1226
1227         strlcpy(input->name, "camera", sizeof(input->name));
1228         input->type = V4L2_INPUT_TYPE_CAMERA;
1229
1230         return 0;
1231 }
1232
1233 static int
1234 isp_video_g_input(struct file *file, void *fh, unsigned int *input)
1235 {
1236         *input = 0;
1237
1238         return 0;
1239 }
1240
1241 static int
1242 isp_video_s_input(struct file *file, void *fh, unsigned int input)
1243 {
1244         return input == 0 ? 0 : -EINVAL;
1245 }
1246
1247 static const struct v4l2_ioctl_ops isp_video_ioctl_ops = {
1248         .vidioc_querycap                = isp_video_querycap,
1249         .vidioc_g_fmt_vid_cap           = isp_video_get_format,
1250         .vidioc_s_fmt_vid_cap           = isp_video_set_format,
1251         .vidioc_try_fmt_vid_cap         = isp_video_try_format,
1252         .vidioc_g_fmt_vid_out           = isp_video_get_format,
1253         .vidioc_s_fmt_vid_out           = isp_video_set_format,
1254         .vidioc_try_fmt_vid_out         = isp_video_try_format,
1255         .vidioc_cropcap                 = isp_video_cropcap,
1256         .vidioc_g_crop                  = isp_video_get_crop,
1257         .vidioc_s_crop                  = isp_video_set_crop,
1258         .vidioc_g_parm                  = isp_video_get_param,
1259         .vidioc_s_parm                  = isp_video_set_param,
1260         .vidioc_reqbufs                 = isp_video_reqbufs,
1261         .vidioc_querybuf                = isp_video_querybuf,
1262         .vidioc_qbuf                    = isp_video_qbuf,
1263         .vidioc_dqbuf                   = isp_video_dqbuf,
1264         .vidioc_streamon                = isp_video_streamon,
1265         .vidioc_streamoff               = isp_video_streamoff,
1266         .vidioc_enum_input              = isp_video_enum_input,
1267         .vidioc_g_input                 = isp_video_g_input,
1268         .vidioc_s_input                 = isp_video_s_input,
1269 };
1270
1271 /* -----------------------------------------------------------------------------
1272  * V4L2 file operations
1273  */
1274
1275 static int isp_video_open(struct file *file)
1276 {
1277         struct isp_video *video = video_drvdata(file);
1278         struct isp_video_fh *handle;
1279         struct vb2_queue *queue;
1280         int ret = 0;
1281
1282         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
1283         if (handle == NULL)
1284                 return -ENOMEM;
1285
1286         v4l2_fh_init(&handle->vfh, &video->video);
1287         v4l2_fh_add(&handle->vfh);
1288
1289         /* If this is the first user, initialise the pipeline. */
1290         if (omap3isp_get(video->isp) == NULL) {
1291                 ret = -EBUSY;
1292                 goto done;
1293         }
1294
1295         ret = v4l2_pipeline_pm_use(&video->video.entity, 1);
1296         if (ret < 0) {
1297                 omap3isp_put(video->isp);
1298                 goto done;
1299         }
1300
1301         queue = &handle->queue;
1302         queue->type = video->type;
1303         queue->io_modes = VB2_MMAP | VB2_USERPTR;
1304         queue->drv_priv = handle;
1305         queue->ops = &isp_video_queue_ops;
1306         queue->mem_ops = &vb2_dma_contig_memops;
1307         queue->buf_struct_size = sizeof(struct isp_buffer);
1308         queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1309         queue->dev = video->isp->dev;
1310
1311         ret = vb2_queue_init(&handle->queue);
1312         if (ret < 0) {
1313                 omap3isp_put(video->isp);
1314                 goto done;
1315         }
1316
1317         memset(&handle->format, 0, sizeof(handle->format));
1318         handle->format.type = video->type;
1319         handle->timeperframe.denominator = 1;
1320
1321         handle->video = video;
1322         file->private_data = &handle->vfh;
1323
1324 done:
1325         if (ret < 0) {
1326                 v4l2_fh_del(&handle->vfh);
1327                 kfree(handle);
1328         }
1329
1330         return ret;
1331 }
1332
1333 static int isp_video_release(struct file *file)
1334 {
1335         struct isp_video *video = video_drvdata(file);
1336         struct v4l2_fh *vfh = file->private_data;
1337         struct isp_video_fh *handle = to_isp_video_fh(vfh);
1338
1339         /* Disable streaming and free the buffers queue resources. */
1340         isp_video_streamoff(file, vfh, video->type);
1341
1342         mutex_lock(&video->queue_lock);
1343         vb2_queue_release(&handle->queue);
1344         mutex_unlock(&video->queue_lock);
1345
1346         v4l2_pipeline_pm_use(&video->video.entity, 0);
1347
1348         /* Release the file handle. */
1349         v4l2_fh_del(vfh);
1350         kfree(handle);
1351         file->private_data = NULL;
1352
1353         omap3isp_put(video->isp);
1354
1355         return 0;
1356 }
1357
1358 static unsigned int isp_video_poll(struct file *file, poll_table *wait)
1359 {
1360         struct isp_video_fh *vfh = to_isp_video_fh(file->private_data);
1361         struct isp_video *video = video_drvdata(file);
1362         int ret;
1363
1364         mutex_lock(&video->queue_lock);
1365         ret = vb2_poll(&vfh->queue, file, wait);
1366         mutex_unlock(&video->queue_lock);
1367
1368         return ret;
1369 }
1370
1371 static int isp_video_mmap(struct file *file, struct vm_area_struct *vma)
1372 {
1373         struct isp_video_fh *vfh = to_isp_video_fh(file->private_data);
1374
1375         return vb2_mmap(&vfh->queue, vma);
1376 }
1377
1378 static struct v4l2_file_operations isp_video_fops = {
1379         .owner = THIS_MODULE,
1380         .unlocked_ioctl = video_ioctl2,
1381         .open = isp_video_open,
1382         .release = isp_video_release,
1383         .poll = isp_video_poll,
1384         .mmap = isp_video_mmap,
1385 };
1386
1387 /* -----------------------------------------------------------------------------
1388  * ISP video core
1389  */
1390
1391 static const struct isp_video_operations isp_video_dummy_ops = {
1392 };
1393
1394 int omap3isp_video_init(struct isp_video *video, const char *name)
1395 {
1396         const char *direction;
1397         int ret;
1398
1399         switch (video->type) {
1400         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1401                 direction = "output";
1402                 video->pad.flags = MEDIA_PAD_FL_SINK
1403                                    | MEDIA_PAD_FL_MUST_CONNECT;
1404                 break;
1405         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1406                 direction = "input";
1407                 video->pad.flags = MEDIA_PAD_FL_SOURCE
1408                                    | MEDIA_PAD_FL_MUST_CONNECT;
1409                 video->video.vfl_dir = VFL_DIR_TX;
1410                 break;
1411
1412         default:
1413                 return -EINVAL;
1414         }
1415
1416         ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
1417         if (ret < 0)
1418                 return ret;
1419
1420         mutex_init(&video->mutex);
1421         atomic_set(&video->active, 0);
1422
1423         spin_lock_init(&video->pipe.lock);
1424         mutex_init(&video->stream_lock);
1425         mutex_init(&video->queue_lock);
1426         spin_lock_init(&video->irqlock);
1427
1428         /* Initialize the video device. */
1429         if (video->ops == NULL)
1430                 video->ops = &isp_video_dummy_ops;
1431
1432         video->video.fops = &isp_video_fops;
1433         snprintf(video->video.name, sizeof(video->video.name),
1434                  "OMAP3 ISP %s %s", name, direction);
1435         video->video.vfl_type = VFL_TYPE_GRABBER;
1436         video->video.release = video_device_release_empty;
1437         video->video.ioctl_ops = &isp_video_ioctl_ops;
1438         video->pipe.stream_state = ISP_PIPELINE_STREAM_STOPPED;
1439
1440         video_set_drvdata(&video->video, video);
1441
1442         return 0;
1443 }
1444
1445 void omap3isp_video_cleanup(struct isp_video *video)
1446 {
1447         media_entity_cleanup(&video->video.entity);
1448         mutex_destroy(&video->queue_lock);
1449         mutex_destroy(&video->stream_lock);
1450         mutex_destroy(&video->mutex);
1451 }
1452
1453 int omap3isp_video_register(struct isp_video *video, struct v4l2_device *vdev)
1454 {
1455         int ret;
1456
1457         video->video.v4l2_dev = vdev;
1458
1459         ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1460         if (ret < 0)
1461                 dev_err(video->isp->dev,
1462                         "%s: could not register video device (%d)\n",
1463                         __func__, ret);
1464
1465         return ret;
1466 }
1467
1468 void omap3isp_video_unregister(struct isp_video *video)
1469 {
1470         if (video_is_registered(&video->video))
1471                 video_unregister_device(&video->video);
1472 }