summaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/exynos4-is/fimc-isp-video.c
blob: c0816728cbfe1d2be7c6eb5c987a4ac3b8213a74 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
/*
 * Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver
 *
 * FIMC-IS ISP video input and video output DMA interface driver
 *
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
 *
 * The hardware handling code derived from a driver written by
 * Younghwan Joo <yhwan.joo@samsung.com>.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/printk.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-dma-contig.h>
#include <media/drv-intf/exynos-fimc.h>

#include "common.h"
#include "media-dev.h"
#include "fimc-is.h"
#include "fimc-isp-video.h"
#include "fimc-is-param.h"

static int isp_video_capture_queue_setup(struct vb2_queue *vq,
			unsigned int *num_buffers, unsigned int *num_planes,
			unsigned int sizes[], void *allocators[])
{
	struct fimc_isp *isp = vb2_get_drv_priv(vq);
	struct v4l2_pix_format_mplane *vid_fmt = &isp->video_capture.pixfmt;
	const struct fimc_fmt *fmt = isp->video_capture.format;
	unsigned int wh, i;

	wh = vid_fmt->width * vid_fmt->height;

	if (fmt == NULL)
		return -EINVAL;

	*num_buffers = clamp_t(u32, *num_buffers, FIMC_ISP_REQ_BUFS_MIN,
						FIMC_ISP_REQ_BUFS_MAX);
	if (*num_planes) {
		if (*num_planes != fmt->memplanes)
			return -EINVAL;
		for (i = 0; i < *num_planes; i++) {
			if (sizes[i] < (wh * fmt->depth[i]) / 8)
				return -EINVAL;
			allocators[i] = isp->alloc_ctx;
		}
		return 0;
	}

	*num_planes = fmt->memplanes;

	for (i = 0; i < fmt->memplanes; i++) {
		sizes[i] = (wh * fmt->depth[i]) / 8;
		allocators[i] = isp->alloc_ctx;
	}

	return 0;
}

static inline struct param_dma_output *__get_isp_dma2(struct fimc_is *is)
{
	return &__get_curr_is_config(is)->isp.dma2_output;
}

static int isp_video_capture_start_streaming(struct vb2_queue *q,
						unsigned int count)
{
	struct fimc_isp *isp = vb2_get_drv_priv(q);
	struct fimc_is *is = fimc_isp_to_is(isp);
	struct param_dma_output *dma = __get_isp_dma2(is);
	struct fimc_is_video *video = &isp->video_capture;
	int ret;

	if (!test_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state) ||
	    test_bit(ST_ISP_VID_CAP_STREAMING, &isp->state))
		return 0;


	dma->cmd = DMA_OUTPUT_COMMAND_ENABLE;
	dma->notify_dma_done = DMA_OUTPUT_NOTIFY_DMA_DONE_ENABLE;
	dma->buffer_address = is->is_dma_p_region +
				DMA2_OUTPUT_ADDR_ARRAY_OFFS;
	dma->buffer_number = video->reqbufs_count;
	dma->dma_out_mask = video->buf_mask;

	isp_dbg(2, &video->ve.vdev,
		"buf_count: %d, planes: %d, dma addr table: %#x\n",
		video->buf_count, video->format->memplanes,
		dma->buffer_address);

	fimc_is_mem_barrier();

	fimc_is_set_param_bit(is, PARAM_ISP_DMA2_OUTPUT);
	__fimc_is_hw_update_param(is, PARAM_ISP_DMA2_OUTPUT);

	ret = fimc_is_itf_s_param(is, false);
	if (ret < 0)
		return ret;

	ret = fimc_pipeline_call(&video->ve, set_stream, 1);
	if (ret < 0)
		return ret;

	set_bit(ST_ISP_VID_CAP_STREAMING, &isp->state);
	return ret;
}

static void isp_video_capture_stop_streaming(struct vb2_queue *q)
{
	struct fimc_isp *isp = vb2_get_drv_priv(q);
	struct fimc_is *is = fimc_isp_to_is(isp);
	struct param_dma_output *dma = __get_isp_dma2(is);
	int ret;

	ret = fimc_pipeline_call(&isp->video_capture.ve, set_stream, 0);
	if (ret < 0)
		return;

	dma->cmd = DMA_OUTPUT_COMMAND_DISABLE;
	dma->notify_dma_done = DMA_OUTPUT_NOTIFY_DMA_DONE_DISABLE;
	dma->buffer_number = 0;
	dma->buffer_address = 0;
	dma->dma_out_mask = 0;

	fimc_is_set_param_bit(is, PARAM_ISP_DMA2_OUTPUT);
	__fimc_is_hw_update_param(is, PARAM_ISP_DMA2_OUTPUT);

	ret = fimc_is_itf_s_param(is, false);
	if (ret < 0)
		dev_warn(&is->pdev->dev, "%s: DMA stop failed\n", __func__);

	fimc_is_hw_set_isp_buf_mask(is, 0);

	clear_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state);
	clear_bit(ST_ISP_VID_CAP_STREAMING, &isp->state);

	isp->video_capture.buf_count = 0;
}

static int isp_video_capture_buffer_prepare(struct vb2_buffer *vb)
{
	struct fimc_isp *isp = vb2_get_drv_priv(vb->vb2_queue);
	struct fimc_is_video *video = &isp->video_capture;
	int i;

	if (video->format == NULL)
		return -EINVAL;

	for (i = 0; i < video->format->memplanes; i++) {
		unsigned long size = video->pixfmt.plane_fmt[i].sizeimage;

		if (vb2_plane_size(vb, i) < size) {
			v4l2_err(&video->ve.vdev,
				 "User buffer too small (%ld < %ld)\n",
				 vb2_plane_size(vb, i), size);
			return -EINVAL;
		}
		vb2_set_plane_payload(vb, i, size);
	}

	/* Check if we get one of the already known buffers. */
	if (test_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state)) {
		dma_addr_t dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
		int i;

		for (i = 0; i < video->buf_count; i++)
			if (video->buffers[i]->dma_addr[0] == dma_addr)
				return 0;
		return -ENXIO;
	}

	return 0;
}

static void isp_video_capture_buffer_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct fimc_isp *isp = vb2_get_drv_priv(vb->vb2_queue);
	struct fimc_is_video *video = &isp->video_capture;
	struct fimc_is *is = fimc_isp_to_is(isp);
	struct isp_video_buf *ivb = to_isp_video_buf(vbuf);
	unsigned long flags;
	unsigned int i;

	if (test_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state)) {
		spin_lock_irqsave(&is->slock, flags);
		video->buf_mask |= BIT(ivb->index);
		spin_unlock_irqrestore(&is->slock, flags);
	} else {
		unsigned int num_planes = video->format->memplanes;

		ivb->index = video->buf_count;
		video->buffers[ivb->index] = ivb;

		for (i = 0; i < num_planes; i++) {
			int buf_index = ivb->index * num_planes + i;

			ivb->dma_addr[i] = vb2_dma_contig_plane_dma_addr(vb, i);
			is->is_p_region->shared[32 + buf_index] =
							ivb->dma_addr[i];

			isp_dbg(2, &video->ve.vdev,
				"dma_buf %d (%d/%d/%d) addr: %pad\n",
				buf_index, ivb->index, i, vb->index,
				&ivb->dma_addr[i]);
		}

		if (++video->buf_count < video->reqbufs_count)
			return;

		video->buf_mask = (1UL << video->buf_count) - 1;
		set_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state);
	}

	if (!test_bit(ST_ISP_VID_CAP_STREAMING, &isp->state))
		isp_video_capture_start_streaming(vb->vb2_queue, 0);
}

/*
 * FIMC-IS ISP input and output DMA interface interrupt handler.
 * Locking: called with is->slock spinlock held.
 */
void fimc_isp_video_irq_handler(struct fimc_is *is)
{
	struct fimc_is_video *video = &is->isp.video_capture;
	struct vb2_v4l2_buffer *vbuf;
	int buf_index;

	/* TODO: Ensure the DMA is really stopped in stop_streaming callback */
	if (!test_bit(ST_ISP_VID_CAP_STREAMING, &is->isp.state))
		return;

	buf_index = (is->i2h_cmd.args[1] - 1) % video->buf_count;
	vbuf = &video->buffers[buf_index]->vb;

	vbuf->vb2_buf.timestamp = ktime_get_ns();
	vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);

	video->buf_mask &= ~BIT(buf_index);
	fimc_is_hw_set_isp_buf_mask(is, video->buf_mask);
}

static const struct vb2_ops isp_video_capture_qops = {
	.queue_setup	 = isp_video_capture_queue_setup,
	.buf_prepare	 = isp_video_capture_buffer_prepare,
	.buf_queue	 = isp_video_capture_buffer_queue,
	.wait_prepare	 = vb2_ops_wait_prepare,
	.wait_finish	 = vb2_ops_wait_finish,
	.start_streaming = isp_video_capture_start_streaming,
	.stop_streaming	 = isp_video_capture_stop_streaming,
};

static int isp_video_open(struct file *file)
{
	struct fimc_isp *isp = video_drvdata(file);
	struct exynos_video_entity *ve = &isp->video_capture.ve;
	struct media_entity *me = &ve->vdev.entity;
	int ret;

	if (mutex_lock_interruptible(&isp->video_lock))
		return -ERESTARTSYS;

	ret = v4l2_fh_open(file);
	if (ret < 0)
		goto unlock;

	ret = pm_runtime_get_sync(&isp->pdev->dev);
	if (ret < 0)
		goto rel_fh;

	if (v4l2_fh_is_singular_file(file)) {
		mutex_lock(&me->graph_obj.mdev->graph_mutex);

		ret = fimc_pipeline_call(ve, open, me, true);

		/* Mark the video pipeline as in use. */
		if (ret == 0)
			me->use_count++;

		mutex_unlock(&me->graph_obj.mdev->graph_mutex);
	}
	if (!ret)
		goto unlock;
rel_fh:
	v4l2_fh_release(file);
unlock:
	mutex_unlock(&isp->video_lock);
	return ret;
}

static int isp_video_release(struct file *file)
{
	struct fimc_isp *isp = video_drvdata(file);
	struct fimc_is_video *ivc = &isp->video_capture;
	struct media_entity *entity = &ivc->ve.vdev.entity;
	struct media_device *mdev = entity->graph_obj.mdev;

	mutex_lock(&isp->video_lock);

	if (v4l2_fh_is_singular_file(file) && ivc->streaming) {
		media_entity_pipeline_stop(entity);
		ivc->streaming = 0;
	}

	vb2_fop_release(file);

	if (v4l2_fh_is_singular_file(file)) {
		fimc_pipeline_call(&ivc->ve, close);

		mutex_lock(&mdev->graph_mutex);
		entity->use_count--;
		mutex_unlock(&mdev->graph_mutex);
	}

	pm_runtime_put(&isp->pdev->dev);
	mutex_unlock(&isp->video_lock);

	return 0;
}

static const struct v4l2_file_operations isp_video_fops = {
	.owner		= THIS_MODULE,
	.open		= isp_video_open,
	.release	= isp_video_release,
	.poll		= vb2_fop_poll,
	.unlocked_ioctl	= video_ioctl2,
	.mmap		= vb2_fop_mmap,
};

/*
 * Video node ioctl operations
 */
static int isp_video_querycap(struct file *file, void *priv,
					struct v4l2_capability *cap)
{
	struct fimc_isp *isp = video_drvdata(file);

	__fimc_vidioc_querycap(&isp->pdev->dev, cap, V4L2_CAP_STREAMING);
	return 0;
}

static int isp_video_enum_fmt_mplane(struct file *file, void *priv,
					struct v4l2_fmtdesc *f)
{
	const struct fimc_fmt *fmt;

	if (f->index >= FIMC_ISP_NUM_FORMATS)
		return -EINVAL;

	fmt = fimc_isp_find_format(NULL, NULL, f->index);
	if (WARN_ON(fmt == NULL))
		return -EINVAL;

	strlcpy(f->description, fmt->name, sizeof(f->description));
	f->pixelformat = fmt->fourcc;

	return 0;
}

static int isp_video_g_fmt_mplane(struct file *file, void *fh,
					struct v4l2_format *f)
{
	struct fimc_isp *isp = video_drvdata(file);

	f->fmt.pix_mp = isp->video_capture.pixfmt;
	return 0;
}

static void __isp_video_try_fmt(struct fimc_isp *isp,
				struct v4l2_pix_format_mplane *pixm,
				const struct fimc_fmt **fmt)
{
	*fmt = fimc_isp_find_format(&pixm->pixelformat, NULL, 2);

	pixm->colorspace = V4L2_COLORSPACE_SRGB;
	pixm->field = V4L2_FIELD_NONE;
	pixm->num_planes = (*fmt)->memplanes;
	pixm->pixelformat = (*fmt)->fourcc;
	/*
	 * TODO: double check with the docmentation these width/height
	 * constraints are correct.
	 */
	v4l_bound_align_image(&pixm->width, FIMC_ISP_SOURCE_WIDTH_MIN,
			      FIMC_ISP_SOURCE_WIDTH_MAX, 3,
			      &pixm->height, FIMC_ISP_SOURCE_HEIGHT_MIN,
			      FIMC_ISP_SOURCE_HEIGHT_MAX, 0, 0);
}

static int isp_video_try_fmt_mplane(struct file *file, void *fh,
					struct v4l2_format *f)
{
	struct fimc_isp *isp = video_drvdata(file);

	__isp_video_try_fmt(isp, &f->fmt.pix_mp, NULL);
	return 0;
}

static int isp_video_s_fmt_mplane(struct file *file, void *priv,
					struct v4l2_format *f)
{
	struct fimc_isp *isp = video_drvdata(file);
	struct fimc_is *is = fimc_isp_to_is(isp);
	struct v4l2_pix_format_mplane *pixm = &f->fmt.pix_mp;
	const struct fimc_fmt *ifmt = NULL;
	struct param_dma_output *dma = __get_isp_dma2(is);

	__isp_video_try_fmt(isp, pixm, &ifmt);

	if (WARN_ON(ifmt == NULL))
		return -EINVAL;

	dma->format = DMA_OUTPUT_FORMAT_BAYER;
	dma->order = DMA_OUTPUT_ORDER_GB_BG;
	dma->plane = ifmt->memplanes;
	dma->bitwidth = ifmt->depth[0];
	dma->width = pixm->width;
	dma->height = pixm->height;

	fimc_is_mem_barrier();

	isp->video_capture.format = ifmt;
	isp->video_capture.pixfmt = *pixm;

	return 0;
}

/*
 * Check for source/sink format differences at each link.
 * Return 0 if the formats match or -EPIPE otherwise.
 */
static int isp_video_pipeline_validate(struct fimc_isp *isp)
{
	struct v4l2_subdev *sd = &isp->subdev;
	struct v4l2_subdev_format sink_fmt, src_fmt;
	struct media_pad *pad;
	int ret;

	while (1) {
		/* Retrieve format at the sink pad */
		pad = &sd->entity.pads[0];
		if (!(pad->flags & MEDIA_PAD_FL_SINK))
			break;
		sink_fmt.pad = pad->index;
		sink_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
		ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &sink_fmt);
		if (ret < 0 && ret != -ENOIOCTLCMD)
			return -EPIPE;

		/* Retrieve format at the source pad */
		pad = media_entity_remote_pad(pad);
		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
			break;

		sd = media_entity_to_v4l2_subdev(pad->entity);
		src_fmt.pad = pad->index;
		src_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
		ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &src_fmt);
		if (ret < 0 && ret != -ENOIOCTLCMD)
			return -EPIPE;

		if (src_fmt.format.width != sink_fmt.format.width ||
		    src_fmt.format.height != sink_fmt.format.height ||
		    src_fmt.format.code != sink_fmt.format.code)
			return -EPIPE;
	}

	return 0;
}

static int isp_video_streamon(struct file *file, void *priv,
				      enum v4l2_buf_type type)
{
	struct fimc_isp *isp = video_drvdata(file);
	struct exynos_video_entity *ve = &isp->video_capture.ve;
	struct media_entity *me = &ve->vdev.entity;
	int ret;

	ret = media_entity_pipeline_start(me, &ve->pipe->mp);
	if (ret < 0)
		return ret;

	ret = isp_video_pipeline_validate(isp);
	if (ret < 0)
		goto p_stop;

	ret = vb2_ioctl_streamon(file, priv, type);
	if (ret < 0)
		goto p_stop;

	isp->video_capture.streaming = 1;
	return 0;
p_stop:
	media_entity_pipeline_stop(me);
	return ret;
}

static int isp_video_streamoff(struct file *file, void *priv,
					enum v4l2_buf_type type)
{
	struct fimc_isp *isp = video_drvdata(file);
	struct fimc_is_video *video = &isp->video_capture;
	int ret;

	ret = vb2_ioctl_streamoff(file, priv, type);
	if (ret < 0)
		return ret;

	media_entity_pipeline_stop(&video->ve.vdev.entity);
	video->streaming = 0;
	return 0;
}

static int isp_video_reqbufs(struct file *file, void *priv,
				struct v4l2_requestbuffers *rb)
{
	struct fimc_isp *isp = video_drvdata(file);
	int ret;

	ret = vb2_ioctl_reqbufs(file, priv, rb);
	if (ret < 0)
		return ret;

	if (rb->count && rb->count < FIMC_ISP_REQ_BUFS_MIN) {
		rb->count = 0;
		vb2_ioctl_reqbufs(file, priv, rb);
		ret = -ENOMEM;
	}

	isp->video_capture.reqbufs_count = rb->count;
	return ret;
}

static const struct v4l2_ioctl_ops isp_video_ioctl_ops = {
	.vidioc_querycap		= isp_video_querycap,
	.vidioc_enum_fmt_vid_cap_mplane	= isp_video_enum_fmt_mplane,
	.vidioc_try_fmt_vid_cap_mplane	= isp_video_try_fmt_mplane,
	.vidioc_s_fmt_vid_cap_mplane	= isp_video_s_fmt_mplane,
	.vidioc_g_fmt_vid_cap_mplane	= isp_video_g_fmt_mplane,
	.vidioc_reqbufs			= isp_video_reqbufs,
	.vidioc_querybuf		= vb2_ioctl_querybuf,
	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
	.vidioc_qbuf			= vb2_ioctl_qbuf,
	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
	.vidioc_streamon		= isp_video_streamon,
	.vidioc_streamoff		= isp_video_streamoff,
};

int fimc_isp_video_device_register(struct fimc_isp *isp,
				   struct v4l2_device *v4l2_dev,
				   enum v4l2_buf_type type)
{
	struct vb2_queue *q = &isp->video_capture.vb_queue;
	struct fimc_is_video *iv;
	struct video_device *vdev;
	int ret;

	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
		iv = &isp->video_capture;
	else
		return -ENOSYS;

	mutex_init(&isp->video_lock);
	INIT_LIST_HEAD(&iv->pending_buf_q);
	INIT_LIST_HEAD(&iv->active_buf_q);
	iv->format = fimc_isp_find_format(NULL, NULL, 0);
	iv->pixfmt.width = IS_DEFAULT_WIDTH;
	iv->pixfmt.height = IS_DEFAULT_HEIGHT;
	iv->pixfmt.pixelformat = iv->format->fourcc;
	iv->pixfmt.colorspace = V4L2_COLORSPACE_SRGB;
	iv->reqbufs_count = 0;

	memset(q, 0, sizeof(*q));
	q->type = type;
	q->io_modes = VB2_MMAP | VB2_USERPTR;
	q->ops = &isp_video_capture_qops;
	q->mem_ops = &vb2_dma_contig_memops;
	q->buf_struct_size = sizeof(struct isp_video_buf);
	q->drv_priv = isp;
	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	q->lock = &isp->video_lock;

	ret = vb2_queue_init(q);
	if (ret < 0)
		return ret;

	vdev = &iv->ve.vdev;
	memset(vdev, 0, sizeof(*vdev));
	snprintf(vdev->name, sizeof(vdev->name), "fimc-is-isp.%s",
			type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ?
			"capture" : "output");
	vdev->queue = q;
	vdev->fops = &isp_video_fops;
	vdev->ioctl_ops = &isp_video_ioctl_ops;
	vdev->v4l2_dev = v4l2_dev;
	vdev->minor = -1;
	vdev->release = video_device_release_empty;
	vdev->lock = &isp->video_lock;

	iv->pad.flags = MEDIA_PAD_FL_SINK;
	ret = media_entity_pads_init(&vdev->entity, 1, &iv->pad);
	if (ret < 0)
		return ret;

	video_set_drvdata(vdev, isp);

	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
	if (ret < 0) {
		media_entity_cleanup(&vdev->entity);
		return ret;
	}

	v4l2_info(v4l2_dev, "Registered %s as /dev/%s\n",
		  vdev->name, video_device_node_name(vdev));

	return 0;
}

void fimc_isp_video_device_unregister(struct fimc_isp *isp,
				      enum v4l2_buf_type type)
{
	struct exynos_video_entity *ve;

	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
		ve = &isp->video_capture.ve;
	else
		return;

	mutex_lock(&isp->video_lock);

	if (video_is_registered(&ve->vdev)) {
		video_unregister_device(&ve->vdev);
		media_entity_cleanup(&ve->vdev.entity);
		ve->pipe = NULL;
	}

	mutex_unlock(&isp->video_lock);
}