Re: [linux-sunxi] [PATCH v6 4/8] media: platform: Add Cedrus VPU decoder driver

[Jernej Åkrabec]

Hi!

Dne sreda, 25. julij 2018 ob 12:02:52 CEST je Paul Kocialkowski napisal(a):
> This introduces the Cedrus VPU driver that supports the VPU found in
> Allwinner SoCs, also known as Video Engine. It is implemented through
> a v4l2 m2m decoder device and a media device (used for media requests).
> So far, it only supports MPEG2 decoding.
> 
> Since this VPU is stateless, synchronization with media requests is
> required in order to ensure consistency between frame headers that
> contain metadata about the frame to process and the raw slice data that
> is used to generate the frame.
> 
> This driver was made possible thanks to the long-standing effort
> carried out by the linux-sunxi community in the interest of reverse
> engineering, documenting and implementing support for Allwinner VPU.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
> ---

<snip>

> +void cedrus_dst_format_set(struct cedrus_dev *dev,
> +			   struct v4l2_pix_format_mplane *fmt)
> +{
> +	unsigned int width = fmt->width;
> +	unsigned int height = fmt->height;
> +	u32 chroma_size;
> +	u32 reg;
> +
> +	switch (fmt->pixelformat) {
> +	case V4L2_PIX_FMT_NV12:
> +		chroma_size = ALIGN(width, 32) * ALIGN(height / 2, 32);

After some testing, it turns out that right aligment for untiled format is 16.

> +
> +		reg = VE_PRIMARY_OUT_FMT_NV12 |
> +		      VE_SECONDARY_SPECIAL_OUT_FMT_NV12;
> +		cedrus_write(dev, VE_PRIMARY_OUT_FMT, reg);
> +
> +		reg = VE_CHROMA_BUF_LEN_SDRT(chroma_size / 2) |
> +		      VE_SECONDARY_OUT_FMT_SPECIAL;
> +		cedrus_write(dev, VE_CHROMA_BUF_LEN, reg);
> +
> +		reg = chroma_size / 2;
> +		cedrus_write(dev, VE_PRIMARY_CHROMA_BUF_LEN, reg);
> +
> +		reg = VE_PRIMARY_FB_LINE_STRIDE_LUMA(ALIGN(width, 32)) |

^ that one should be aligned to 16

> +		      VE_PRIMARY_FB_LINE_STRIDE_CHROMA(ALIGN(width / 2, 16));
> +		cedrus_write(dev, VE_PRIMARY_FB_LINE_STRIDE, reg);
> +
> +		break;
> +	case V4L2_PIX_FMT_MB32_NV12:
> +	default:
> +		reg = VE_PRIMARY_OUT_FMT_MB32_NV12;
> +		cedrus_write(dev, VE_PRIMARY_OUT_FMT, reg);
> +
> +		reg = VE_SECONDARY_OUT_FMT_MB32_NV12;
> +		cedrus_write(dev, VE_CHROMA_BUF_LEN, reg);
> +
> +		break;
> +	}
> +}

<snip>

> +static void cedrus_prepare_plane_format(struct cedrus_format *fmt,
> +					struct v4l2_format *f,
> +					unsigned int i)
> +{
> +	struct v4l2_plane_pix_format *plane_fmt = &f->fmt.pix_mp.plane_fmt[i];
> +	unsigned int width = f->fmt.pix_mp.width;
> +	unsigned int height = f->fmt.pix_mp.height;
> +	unsigned int sizeimage = plane_fmt->sizeimage;
> +	unsigned int bytesperline = plane_fmt->bytesperline;
> +
> +	switch (fmt->pixelformat) {
> +	case V4L2_PIX_FMT_MPEG2_SLICE:
> +		/* Zero bytes per line. */
> +		bytesperline = 0;
> +		break;
> +
> +	case V4L2_PIX_FMT_MB32_NV12:
> +		/* 32-aligned stride. */
> +		bytesperline = ALIGN(width, 32);
> +
> +		/* 32-aligned (luma) height. */
> +		height = ALIGN(height, 32);
> +
> +		if (i == 0)
> +			/* 32-aligned luma size. */
> +			sizeimage = bytesperline * height;
> +		else if (i == 1)
> +			/* 32-aligned chroma size with 2x2 sub-sampling. */
> +			sizeimage = bytesperline * ALIGN(height / 2, 32);
> +
> +		break;
> +
> +	case V4L2_PIX_FMT_NV12:
> +		/* 32-aligned stride. */
> +		bytesperline = ALIGN(width, 32);

^ and that one should be aligned to 16 too.

This partially fixes some MPEG2 videos I have tested with Kodi. I think there 
are other aligment issues, but I have to find them first.

Best regards,
Jernej

> +
> +		if (i == 0)
> +			/* Regular luma size. */
> +			sizeimage = bytesperline * height;
> +		else if (i == 1)
> +			/* Regular chroma size with 2x2 sub-sampling. */
> +			sizeimage = bytesperline * height / 2;
> +
> +		break;
> +	}
> +
> +	f->fmt.pix_mp.width = width;
> +	f->fmt.pix_mp.height = height;
> +
> +	plane_fmt->bytesperline = bytesperline;
> +	plane_fmt->sizeimage = sizeimage;
> +}
> +
> +static void cedrus_prepare_format(struct cedrus_format *fmt,
> +				  struct v4l2_format *f)
> +{
> +	unsigned int i;
> +
> +	f->fmt.pix_mp.field = V4L2_FIELD_NONE;
> +	f->fmt.pix_mp.num_planes = fmt->num_planes;
> +
> +	for (i = 0; i < fmt->num_planes; i++)
> +		cedrus_prepare_plane_format(fmt, f, i);
> +}
> +
> +static int cedrus_querycap(struct file *file, void *priv,
> +			   struct v4l2_capability *cap)
> +{
> +	strncpy(cap->driver, CEDRUS_NAME, sizeof(cap->driver) - 1);
> +	strncpy(cap->card, CEDRUS_NAME, sizeof(cap->card) - 1);
> +	snprintf(cap->bus_info, sizeof(cap->bus_info),
> +		 "platform:%s", CEDRUS_NAME);
> +
> +	cap->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
> +	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
> +
> +	return 0;
> +}
> +
> +static int cedrus_enum_fmt(struct file *file, struct v4l2_fmtdesc *f,
> +			   u32 direction)
> +{
> +	struct cedrus_ctx *ctx = cedrus_file2ctx(file);
> +	struct cedrus_dev *dev = ctx->dev;
> +	unsigned int capabilities = dev->capabilities;
> +	struct cedrus_format *fmt;
> +	unsigned int i, index;
> +
> +	/* Index among formats that match the requested direction. */
> +	index = 0;
> +
> +	for (i = 0; i < CEDRUS_FORMATS_COUNT; i++) {
> +		fmt = &cedrus_formats[i];
> +
> +		if (fmt->capabilities && (fmt->capabilities & capabilities) !=
> +		    fmt->capabilities)
> +			continue;
> +
> +		if (!(cedrus_formats[i].directions & direction))
> +			continue;
> +
> +		if (index == f->index)
> +			break;
> +
> +		index++;
> +	}
> +
> +	/* Matched format. */
> +	if (i < CEDRUS_FORMATS_COUNT) {
> +		f->pixelformat = cedrus_formats[i].pixelformat;
> +
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int cedrus_enum_fmt_vid_cap(struct file *file, void *priv,
> +				   struct v4l2_fmtdesc *f)
> +{
> +	return cedrus_enum_fmt(file, f, CEDRUS_DECODE_DST);
> +}
> +
> +static int cedrus_enum_fmt_vid_out(struct file *file, void *priv,
> +				   struct v4l2_fmtdesc *f)
> +{
> +	return cedrus_enum_fmt(file, f, CEDRUS_DECODE_SRC);
> +}
> +
> +static int cedrus_g_fmt_vid_cap(struct file *file, void *priv,
> +				struct v4l2_format *f)
> +{
> +	struct cedrus_ctx *ctx = cedrus_file2ctx(file);
> +
> +	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		return -EINVAL;
> +
> +	f->fmt.pix_mp = ctx->dst_fmt;
> +
> +	return 0;
> +}
> +
> +static int cedrus_g_fmt_vid_out(struct file *file, void *priv,
> +				struct v4l2_format *f)
> +{
> +	struct cedrus_ctx *ctx = cedrus_file2ctx(file);
> +
> +	if (f->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		return -EINVAL;
> +
> +	f->fmt.pix_mp = ctx->src_fmt;
> +
> +	return 0;
> +}
> +
> +static int cedrus_try_fmt_vid_cap(struct file *file, void *priv,
> +				  struct v4l2_format *f)
> +{
> +	struct cedrus_ctx *ctx = cedrus_file2ctx(file);
> +	struct cedrus_dev *dev = ctx->dev;
> +	struct cedrus_format *fmt;
> +
> +	fmt = cedrus_find_format(f->fmt.pix_mp.pixelformat, CEDRUS_DECODE_DST,
> +				 dev->capabilities);
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	cedrus_prepare_format(fmt, f);
> +
> +	/* Limit to hardware min/max. */
> +	f->fmt.pix_mp.width = clamp(f->fmt.pix_mp.width, CEDRUS_MIN_WIDTH,
> +				    CEDRUS_MAX_WIDTH);
> +	f->fmt.pix_mp.height = clamp(f->fmt.pix_mp.height, CEDRUS_MIN_HEIGHT,
> +				     CEDRUS_MAX_HEIGHT);
> +
> +	return 0;
> +}
> +
> +static int cedrus_try_fmt_vid_out(struct file *file, void *priv,
> +				  struct v4l2_format *f)
> +{
> +	struct cedrus_ctx *ctx = cedrus_file2ctx(file);
> +	struct cedrus_dev *dev = ctx->dev;
> +	struct cedrus_format *fmt;
> +	struct v4l2_plane_pix_format *plane_fmt;
> +	unsigned int i;
> +
> +	fmt = cedrus_find_format(f->fmt.pix_mp.pixelformat, CEDRUS_DECODE_SRC,
> +				 dev->capabilities);
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	cedrus_prepare_format(fmt, f);
> +
> +	for (i = 0; i < f->fmt.pix_mp.num_planes; i++) {
> +		plane_fmt = &f->fmt.pix_mp.plane_fmt[i];
> +
> +		/* Source image size has to be given by userspace. */
> +		if (plane_fmt->sizeimage == 0)
> +			return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int cedrus_s_fmt_vid_cap(struct file *file, void *priv,
> +				struct v4l2_format *f)
> +{
> +	struct cedrus_ctx *ctx = cedrus_file2ctx(file);
> +	struct cedrus_dev *dev = ctx->dev;
> +	int ret;
> +
> +	ret = cedrus_try_fmt_vid_cap(file, priv, f);
> +	if (ret)
> +		return ret;
> +
> +	ctx->dst_fmt = f->fmt.pix_mp;
> +
> +	cedrus_dst_format_set(dev, &ctx->dst_fmt);
> +
> +	return 0;
> +}
> +
> +static int cedrus_s_fmt_vid_out(struct file *file, void *priv,
> +				struct v4l2_format *f)
> +{
> +	struct cedrus_ctx *ctx = cedrus_file2ctx(file);
> +	int ret;
> +
> +	ret = cedrus_try_fmt_vid_out(file, priv, f);
> +	if (ret)
> +		return ret;
> +
> +	ctx->src_fmt = f->fmt.pix_mp;
> +
> +	return 0;
> +}
> +
> +const struct v4l2_ioctl_ops cedrus_ioctl_ops = {
> +	.vidioc_querycap		= cedrus_querycap,
> +
> +	.vidioc_enum_fmt_vid_cap_mplane	= cedrus_enum_fmt_vid_cap,
> +	.vidioc_g_fmt_vid_cap_mplane	= cedrus_g_fmt_vid_cap,
> +	.vidioc_try_fmt_vid_cap_mplane	= cedrus_try_fmt_vid_cap,
> +	.vidioc_s_fmt_vid_cap_mplane	= cedrus_s_fmt_vid_cap,
> +
> +	.vidioc_enum_fmt_vid_out_mplane = cedrus_enum_fmt_vid_out,
> +	.vidioc_g_fmt_vid_out_mplane	= cedrus_g_fmt_vid_out,
> +	.vidioc_try_fmt_vid_out_mplane	= cedrus_try_fmt_vid_out,
> +	.vidioc_s_fmt_vid_out_mplane	= cedrus_s_fmt_vid_out,
> +
> +	.vidioc_reqbufs			= v4l2_m2m_ioctl_reqbufs,
> +	.vidioc_querybuf		= v4l2_m2m_ioctl_querybuf,
> +	.vidioc_qbuf			= v4l2_m2m_ioctl_qbuf,
> +	.vidioc_dqbuf			= v4l2_m2m_ioctl_dqbuf,
> +	.vidioc_prepare_buf		= v4l2_m2m_ioctl_prepare_buf,
> +	.vidioc_create_bufs		= v4l2_m2m_ioctl_create_bufs,
> +	.vidioc_expbuf			= v4l2_m2m_ioctl_expbuf,
> +
> +	.vidioc_streamon		= v4l2_m2m_ioctl_streamon,
> +	.vidioc_streamoff		= v4l2_m2m_ioctl_streamoff,
> +
> +	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
> +	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
> +};
> +
> +static int cedrus_queue_setup(struct vb2_queue *vq, unsigned int *nbufs,
> +			      unsigned int *nplanes, unsigned int sizes[],
> +			      struct device *alloc_devs[])
> +{
> +	struct cedrus_ctx *ctx = vb2_get_drv_priv(vq);
> +	struct cedrus_dev *dev = ctx->dev;
> +	struct v4l2_pix_format_mplane *mplane_fmt;
> +	struct cedrus_format *fmt;
> +	unsigned int i;
> +
> +	switch (vq->type) {
> +	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
> +		mplane_fmt = &ctx->src_fmt;
> +		fmt = cedrus_find_format(mplane_fmt->pixelformat,
> +					 CEDRUS_DECODE_SRC,
> +					 dev->capabilities);
> +		break;
> +
> +	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
> +		mplane_fmt = &ctx->dst_fmt;
> +		fmt = cedrus_find_format(mplane_fmt->pixelformat,
> +					 CEDRUS_DECODE_DST,
> +					 dev->capabilities);
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	if (fmt->num_buffers == 1) {
> +		sizes[0] = 0;
> +
> +		for (i = 0; i < fmt->num_planes; i++)
> +			sizes[0] += mplane_fmt->plane_fmt[i].sizeimage;
> +	} else if (fmt->num_buffers == fmt->num_planes) {
> +		for (i = 0; i < fmt->num_planes; i++)
> +			sizes[i] = mplane_fmt->plane_fmt[i].sizeimage;
> +	} else {
> +		return -EINVAL;
> +	}
> +
> +	*nplanes = fmt->num_buffers;
> +
> +	return 0;
> +}
> +
> +static int cedrus_buf_init(struct vb2_buffer *vb)
> +{
> +	struct vb2_queue *vq = vb->vb2_queue;
> +	struct cedrus_ctx *ctx = vb2_get_drv_priv(vq);
> +
> +	if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		ctx->dst_bufs[vb->index] = vb;
> +
> +	return 0;
> +}
> +
> +static void cedrus_buf_cleanup(struct vb2_buffer *vb)
> +{
> +	struct vb2_queue *vq = vb->vb2_queue;
> +	struct cedrus_ctx *ctx = vb2_get_drv_priv(vq);
> +
> +	if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		ctx->dst_bufs[vb->index] = NULL;
> +}
> +
> +static int cedrus_buf_prepare(struct vb2_buffer *vb)
> +{
> +	struct vb2_queue *vq = vb->vb2_queue;
> +	struct cedrus_ctx *ctx = vb2_get_drv_priv(vq);
> +	struct v4l2_pix_format_mplane *fmt;
> +	unsigned int buffer_size = 0;
> +	unsigned int format_size = 0;
> +	unsigned int i;
> +
> +	if (vq->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		fmt = &ctx->src_fmt;
> +	else if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		fmt = &ctx->dst_fmt;
> +	else
> +		return -EINVAL;
> +
> +	for (i = 0; i < vb->num_planes; i++)
> +		buffer_size += vb2_plane_size(vb, i);
> +
> +	for (i = 0; i < fmt->num_planes; i++)
> +		format_size += fmt->plane_fmt[i].sizeimage;
> +
> +	if (buffer_size < format_size)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +static int cedrus_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> +	struct cedrus_ctx *ctx = vb2_get_drv_priv(q);
> +	struct cedrus_dev *dev = ctx->dev;
> +	int ret = 0;
> +
> +	switch (ctx->src_fmt.pixelformat) {
> +	case V4L2_PIX_FMT_MPEG2_SLICE:
> +		ctx->current_codec = CEDRUS_CODEC_MPEG2;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	if (V4L2_TYPE_IS_OUTPUT(q->type) &&
> +	    dev->dec_ops[ctx->current_codec]->start)
> +		ret = dev->dec_ops[ctx->current_codec]->start(ctx);
> +
> +	return ret;
> +}
> +
> +static void cedrus_stop_streaming(struct vb2_queue *q)
> +{
> +	struct cedrus_ctx *ctx = vb2_get_drv_priv(q);
> +	struct cedrus_dev *dev = ctx->dev;
> +	struct vb2_v4l2_buffer *vbuf;
> +	unsigned long flags;
> +
> +	flush_scheduled_work();
> +
> +	if (V4L2_TYPE_IS_OUTPUT(q->type) &&
> +	    dev->dec_ops[ctx->current_codec]->stop)
> +		dev->dec_ops[ctx->current_codec]->stop(ctx);
> +
> +	for (;;) {
> +		spin_lock_irqsave(&ctx->dev->irq_lock, flags);
> +
> +		if (V4L2_TYPE_IS_OUTPUT(q->type))
> +			vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
> +		else
> +			vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
> +
> +		spin_unlock_irqrestore(&ctx->dev->irq_lock, flags);
> +
> +		if (!vbuf)
> +			return;
> +
> +		v4l2_ctrl_request_complete(vbuf->vb2_buf.req_obj.req,
> +					   &ctx->hdl);
> +		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
> +	}
> +}
> +
> +static void cedrus_buf_queue(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct cedrus_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> +
> +	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
> +}
> +
> +static void cedrus_buf_request_complete(struct vb2_buffer *vb)
> +{
> +	struct cedrus_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> +
> +	v4l2_ctrl_request_complete(vb->req_obj.req, &ctx->hdl);
> +}
> +
> +static struct vb2_ops cedrus_qops = {
> +	.queue_setup		= cedrus_queue_setup,
> +	.buf_prepare		= cedrus_buf_prepare,
> +	.buf_init		= cedrus_buf_init,
> +	.buf_cleanup		= cedrus_buf_cleanup,
> +	.buf_queue		= cedrus_buf_queue,
> +	.buf_request_complete	= cedrus_buf_request_complete,
> +	.start_streaming	= cedrus_start_streaming,
> +	.stop_streaming		= cedrus_stop_streaming,
> +	.wait_prepare		= vb2_ops_wait_prepare,
> +	.wait_finish		= vb2_ops_wait_finish,
> +};
> +
> +int cedrus_queue_init(void *priv, struct vb2_queue *src_vq,
> +		      struct vb2_queue *dst_vq)
> +{
> +	struct cedrus_ctx *ctx = priv;
> +	int ret;
> +
> +	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +	src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +	src_vq->drv_priv = ctx;
> +	src_vq->buf_struct_size = sizeof(struct cedrus_buffer);
> +	src_vq->allow_zero_bytesused = 1;
> +	src_vq->min_buffers_needed = 1;
> +	src_vq->ops = &cedrus_qops;
> +	src_vq->mem_ops = &vb2_dma_contig_memops;
> +	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	src_vq->lock = &ctx->dev->dev_mutex;
> +	src_vq->dev = ctx->dev->dev;
> +
> +	ret = vb2_queue_init(src_vq);
> +	if (ret)
> +		return ret;
> +
> +	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +	dst_vq->drv_priv = ctx;
> +	dst_vq->buf_struct_size = sizeof(struct cedrus_buffer);
> +	dst_vq->allow_zero_bytesused = 1;
> +	dst_vq->min_buffers_needed = 1;
> +	dst_vq->ops = &cedrus_qops;
> +	dst_vq->mem_ops = &vb2_dma_contig_memops;
> +	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	dst_vq->lock = &ctx->dev->dev_mutex;
> +	dst_vq->dev = ctx->dev->dev;
> +
> +	return vb2_queue_init(dst_vq);
> +}
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.h
> b/drivers/staging/media/sunxi/cedrus/cedrus_video.h new file mode 100644
> index 000000000000..56afcc8c02ba
> --- /dev/null
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Sunxi-Cedrus VPU driver
> + *
> + * Copyright (C) 2018 Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
> + * Copyright (C) 2016 Florent Revest <florent.revest@xxxxxxxxxxxxxxxxxx>
> + *
> + * Based on the vim2m driver, that is:
> + *
> + * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
> + * Pawel Osciak, <pawel@xxxxxxxxxx>
> + * Marek Szyprowski, <m.szyprowski@xxxxxxxxxxx>
> + */
> +
> +#ifndef _CEDRUS_VIDEO_H_
> +#define _CEDRUS_VIDEO_H_
> +
> +struct cedrus_format {
> +	u32		pixelformat;
> +	u32		directions;
> +	unsigned int	num_planes;
> +	unsigned int	num_buffers;
> +	unsigned int	capabilities;
> +};
> +
> +extern const struct v4l2_ioctl_ops cedrus_ioctl_ops;
> +
> +int cedrus_queue_init(void *priv, struct vb2_queue *src_vq,
> +		      struct vb2_queue *dst_vq);
> +
> +#endif