// SPDX-License-Identifier: GPL-2.0
/*
 * Hantro VPU codec driver
 *
 * Copyright (C) 2018 Collabora, Ltd.
 * Copyright (C) 2018 Rockchip Electronics Co., Ltd.
 *      Alpha Lin <Alpha.Lin@rock-chips.com>
 *      Jeffy Chen <jeffy.chen@rock-chips.com>
 *
 * Copyright 2018 Google LLC.
 *      Tomasz Figa <tfiga@chromium.org>
 *
 * Based on s5p-mfc driver by Samsung Electronics Co., Ltd.
 * Copyright (C) 2010-2011 Samsung Electronics Co., Ltd.
 */

#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/videodev2.h>
#include <linux/workqueue.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-sg.h>

#include "hantro.h"
#include "hantro_hw.h"
#include "hantro_v4l2.h"

static int hantro_set_fmt_out(struct hantro_ctx *ctx,
                              struct v4l2_pix_format_mplane *pix_mp);
static int hantro_set_fmt_cap(struct hantro_ctx *ctx,
                              struct v4l2_pix_format_mplane *pix_mp);

static const struct hantro_fmt *
hantro_get_formats(const struct hantro_ctx *ctx, unsigned int *num_fmts)
{
        const struct hantro_fmt *formats;

        if (ctx->is_encoder) {
                formats = ctx->dev->variant->enc_fmts;
                *num_fmts = ctx->dev->variant->num_enc_fmts;
        } else {
                formats = ctx->dev->variant->dec_fmts;
                *num_fmts = ctx->dev->variant->num_dec_fmts;
        }

        return formats;
}

static const struct hantro_fmt *
hantro_get_postproc_formats(const struct hantro_ctx *ctx,
                            unsigned int *num_fmts)
{
        if (ctx->is_encoder) {
                *num_fmts = 0;
                return NULL;
        }

        *num_fmts = ctx->dev->variant->num_postproc_fmts;
        return ctx->dev->variant->postproc_fmts;
}

static const struct hantro_fmt *
hantro_find_format(const struct hantro_ctx *ctx, u32 fourcc)
{
        const struct hantro_fmt *formats;
        unsigned int i, num_fmts;

        formats = hantro_get_formats(ctx, &num_fmts);
        for (i = 0; i < num_fmts; i++)
                if (formats[i].fourcc == fourcc)
                        return &formats[i];

        formats = hantro_get_postproc_formats(ctx, &num_fmts);
        for (i = 0; i < num_fmts; i++)
                if (formats[i].fourcc == fourcc)
                        return &formats[i];
        return NULL;
}

static const struct hantro_fmt *
hantro_get_default_fmt(const struct hantro_ctx *ctx, bool bitstream)
{
        const struct hantro_fmt *formats;
        unsigned int i, num_fmts;

        formats = hantro_get_formats(ctx, &num_fmts);
        for (i = 0; i < num_fmts; i++) {
                if (bitstream == (formats[i].codec_mode !=
                                  HANTRO_MODE_NONE))
                        return &formats[i];
        }
        return NULL;
}

static int vidioc_querycap(struct file *file, void *priv,
                           struct v4l2_capability *cap)
{
        struct hantro_dev *vpu = video_drvdata(file);
        struct video_device *vdev = video_devdata(file);

        strscpy(cap->driver, vpu->dev->driver->name, sizeof(cap->driver));
        strscpy(cap->card, vdev->name, sizeof(cap->card));
        snprintf(cap->bus_info, sizeof(cap->bus_info), "platform: %s",
                 vpu->dev->driver->name);
        return 0;
}

static int vidioc_enum_framesizes(struct file *file, void *priv,
                                  struct v4l2_frmsizeenum *fsize)
{
        struct hantro_ctx *ctx = fh_to_ctx(priv);
        const struct hantro_fmt *fmt;

        if (fsize->index != 0) {
                vpu_debug(0, "invalid frame size index (expected 0, got %d)\n",
                          fsize->index);
                return -EINVAL;
        }

        fmt = hantro_find_format(ctx, fsize->pixel_format);
        if (!fmt) {
                vpu_debug(0, "unsupported bitstream format (%08x)\n",
                          fsize->pixel_format);
                return -EINVAL;
        }

        /* This only makes sense for coded formats */
        if (fmt->codec_mode == HANTRO_MODE_NONE)
                return -EINVAL;

        fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
        fsize->stepwise = fmt->frmsize;

        return 0;
}

static int vidioc_enum_fmt(struct file *file, void *priv,
                           struct v4l2_fmtdesc *f, bool capture)

{
        struct hantro_ctx *ctx = fh_to_ctx(priv);
        const struct hantro_fmt *fmt, *formats;
        unsigned int num_fmts, i, j = 0;
        bool skip_mode_none;

        /*
         * When dealing with an encoder:
         *  - on the capture side we want to filter out all MODE_NONE formats.
         *  - on the output side we want to filter out all formats that are
         *    not MODE_NONE.
         * When dealing with a decoder:
         *  - on the capture side we want to filter out all formats that are
         *    not MODE_NONE.
         *  - on the output side we want to filter out all MODE_NONE formats.
         */
        skip_mode_none = capture == ctx->is_encoder;

        formats = hantro_get_formats(ctx, &num_fmts);
        for (i = 0; i < num_fmts; i++) {
                bool mode_none = formats[i].codec_mode == HANTRO_MODE_NONE;

                if (skip_mode_none == mode_none)
                        continue;
                if (j == f->index) {
                        fmt = &formats[i];
                        f->pixelformat = fmt->fourcc;
                        return 0;
                }
                ++j;
        }

        /*
         * Enumerate post-processed formats. As per the specification,
         * we enumerated these formats after natively decoded formats
         * as a hint for applications on what's the preferred fomat.
         */
        if (!capture)
                return -EINVAL;
        formats = hantro_get_postproc_formats(ctx, &num_fmts);
        for (i = 0; i < num_fmts; i++) {
                if (j == f->index) {
                        fmt = &formats[i];
                        f->pixelformat = fmt->fourcc;
                        return 0;
                }
                ++j;
        }

        return -EINVAL;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
                                   struct v4l2_fmtdesc *f)
{
        return vidioc_enum_fmt(file, priv, f, true);
}

static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
                                   struct v4l2_fmtdesc *f)
{
        return vidioc_enum_fmt(file, priv, f, false);
}

static int vidioc_g_fmt_out_mplane(struct file *file, void *priv,
                                   struct v4l2_format *f)
{
        struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
        struct hantro_ctx *ctx = fh_to_ctx(priv);

        vpu_debug(4, "f->type = %d\n", f->type);

        *pix_mp = ctx->src_fmt;

        return 0;
}

static int vidioc_g_fmt_cap_mplane(struct file *file, void *priv,
                                   struct v4l2_format *f)
{
        struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
        struct hantro_ctx *ctx = fh_to_ctx(priv);

        vpu_debug(4, "f->type = %d\n", f->type);

        *pix_mp = ctx->dst_fmt;

        return 0;
}

static int hantro_try_fmt(const struct hantro_ctx *ctx,
                          struct v4l2_pix_format_mplane *pix_mp,
                          enum v4l2_buf_type type)
{
        const struct hantro_fmt *fmt, *vpu_fmt;
        bool capture = V4L2_TYPE_IS_CAPTURE(type);
        bool coded;

        coded = capture == ctx->is_encoder;

        vpu_debug(4, "trying format %c%c%c%c\n",
                  (pix_mp->pixelformat & 0x7f),
                  (pix_mp->pixelformat >> 8) & 0x7f,
                  (pix_mp->pixelformat >> 16) & 0x7f,
                  (pix_mp->pixelformat >> 24) & 0x7f);

        fmt = hantro_find_format(ctx, pix_mp->pixelformat);
        if (!fmt) {
                fmt = hantro_get_default_fmt(ctx, coded);
                pix_mp->pixelformat = fmt->fourcc;
        }

        if (coded) {
                pix_mp->num_planes = 1;
                vpu_fmt = fmt;
        } else if (ctx->is_encoder) {
                vpu_fmt = ctx->vpu_dst_fmt;
        } else {
                vpu_fmt = ctx->vpu_src_fmt;
                /*
                 * Width/height on the CAPTURE end of a decoder are ignored and
                 * replaced by the OUTPUT ones.
                 */
                pix_mp->width = ctx->src_fmt.width;
                pix_mp->height = ctx->src_fmt.height;
        }

        pix_mp->field = V4L2_FIELD_NONE;

        v4l2_apply_frmsize_constraints(&pix_mp->width, &pix_mp->height,
                                       &vpu_fmt->frmsize);

        if (!coded) {
                /* Fill remaining fields */
                v4l2_fill_pixfmt_mp(pix_mp, fmt->fourcc, pix_mp->width,
                                    pix_mp->height);
                if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_H264_SLICE &&
                    !hantro_needs_postproc(ctx, fmt))
                        pix_mp->plane_fmt[0].sizeimage +=
                                hantro_h264_mv_size(pix_mp->width,
                                                    pix_mp->height);
        } else if (!pix_mp->plane_fmt[0].sizeimage) {
                /*
                 * For coded formats the application can specify
                 * sizeimage. If the application passes a zero sizeimage,
                 * let's default to the maximum frame size.
                 */
                pix_mp->plane_fmt[0].sizeimage = fmt->header_size +
                        pix_mp->width * pix_mp->height * fmt->max_depth;
        }

        return 0;
}

static int vidioc_try_fmt_cap_mplane(struct file *file, void *priv,
                                     struct v4l2_format *f)
{
        return hantro_try_fmt(fh_to_ctx(priv), &f->fmt.pix_mp, f->type);
}

static int vidioc_try_fmt_out_mplane(struct file *file, void *priv,
                                     struct v4l2_format *f)
{
        return hantro_try_fmt(fh_to_ctx(priv), &f->fmt.pix_mp, f->type);
}

static void
hantro_reset_fmt(struct v4l2_pix_format_mplane *fmt,
                 const struct hantro_fmt *vpu_fmt)
{
        memset(fmt, 0, sizeof(*fmt));

        fmt->pixelformat = vpu_fmt->fourcc;
        fmt->field = V4L2_FIELD_NONE;
        fmt->colorspace = V4L2_COLORSPACE_JPEG;
        fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
        fmt->quantization = V4L2_QUANTIZATION_DEFAULT;
        fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
}

static void
hantro_reset_encoded_fmt(struct hantro_ctx *ctx)
{
        const struct hantro_fmt *vpu_fmt;
        struct v4l2_pix_format_mplane *fmt;

        vpu_fmt = hantro_get_default_fmt(ctx, true);

        if (ctx->is_encoder) {
                ctx->vpu_dst_fmt = vpu_fmt;
                fmt = &ctx->dst_fmt;
        } else {
                ctx->vpu_src_fmt = vpu_fmt;
                fmt = &ctx->src_fmt;
        }

        hantro_reset_fmt(fmt, vpu_fmt);
        fmt->width = vpu_fmt->frmsize.min_width;
        fmt->height = vpu_fmt->frmsize.min_height;
        if (ctx->is_encoder)
                hantro_set_fmt_cap(ctx, fmt);
        else
                hantro_set_fmt_out(ctx, fmt);
}

static void
hantro_reset_raw_fmt(struct hantro_ctx *ctx)
{
        const struct hantro_fmt *raw_vpu_fmt;
        struct v4l2_pix_format_mplane *raw_fmt, *encoded_fmt;

        raw_vpu_fmt = hantro_get_default_fmt(ctx, false);

        if (ctx->is_encoder) {
                ctx->vpu_src_fmt = raw_vpu_fmt;
                raw_fmt = &ctx->src_fmt;
                encoded_fmt = &ctx->dst_fmt;
        } else {
                ctx->vpu_dst_fmt = raw_vpu_fmt;
                raw_fmt = &ctx->dst_fmt;
                encoded_fmt = &ctx->src_fmt;
        }

        hantro_reset_fmt(raw_fmt, raw_vpu_fmt);
        raw_fmt->width = encoded_fmt->width;
        raw_fmt->height = encoded_fmt->height;
        if (ctx->is_encoder)
                hantro_set_fmt_out(ctx, raw_fmt);
        else
                hantro_set_fmt_cap(ctx, raw_fmt);
}

void hantro_reset_fmts(struct hantro_ctx *ctx)
{
        hantro_reset_encoded_fmt(ctx);
        hantro_reset_raw_fmt(ctx);
}

static void
hantro_update_requires_request(struct hantro_ctx *ctx, u32 fourcc)
{
        switch (fourcc) {
        case V4L2_PIX_FMT_JPEG:
                ctx->fh.m2m_ctx->out_q_ctx.q.requires_requests = false;
                break;
        case V4L2_PIX_FMT_MPEG2_SLICE:
        case V4L2_PIX_FMT_VP8_FRAME:
        case V4L2_PIX_FMT_H264_SLICE:
                ctx->fh.m2m_ctx->out_q_ctx.q.requires_requests = true;
                break;
        default:
                break;
        }
}

static int hantro_set_fmt_out(struct hantro_ctx *ctx,
                              struct v4l2_pix_format_mplane *pix_mp)
{
        struct vb2_queue *vq;
        int ret;

        vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
                             V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
        ret = hantro_try_fmt(ctx, pix_mp, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
        if (ret)
                return ret;

        if (!ctx->is_encoder) {
                struct vb2_queue *peer_vq;

                /*
                 * In order to support dynamic resolution change,
                 * the decoder admits a resolution change, as long
                 * as the pixelformat remains. Can't be done if streaming.
                 */
                if (vb2_is_streaming(vq) || (vb2_is_busy(vq) &&
                    pix_mp->pixelformat != ctx->src_fmt.pixelformat))
                        return -EBUSY;
                /*
                 * Since format change on the OUTPUT queue will reset
                 * the CAPTURE queue, we can't allow doing so
                 * when the CAPTURE queue has buffers allocated.
                 */
                peer_vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
                                          V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
                if (vb2_is_busy(peer_vq))
                        return -EBUSY;
        } else {
                /*
                 * The encoder doesn't admit a format change if
                 * there are OUTPUT buffers allocated.
                 */
                if (vb2_is_busy(vq))
                        return -EBUSY;
        }

        ctx->vpu_src_fmt = hantro_find_format(ctx, pix_mp->pixelformat);
        ctx->src_fmt = *pix_mp;

        /*
         * Current raw format might have become invalid with newly
         * selected codec, so reset it to default just to be safe and
         * keep internal driver state sane. User is mandated to set
         * the raw format again after we return, so we don't need
         * anything smarter.
         * Note that hantro_reset_raw_fmt() also propagates size
         * changes to the raw format.
         */
        if (!ctx->is_encoder)
                hantro_reset_raw_fmt(ctx);

        /* Colorimetry information are always propagated. */
        ctx->dst_fmt.colorspace = pix_mp->colorspace;
        ctx->dst_fmt.ycbcr_enc = pix_mp->ycbcr_enc;
        ctx->dst_fmt.xfer_func = pix_mp->xfer_func;
        ctx->dst_fmt.quantization = pix_mp->quantization;

        hantro_update_requires_request(ctx, pix_mp->pixelformat);

        vpu_debug(0, "OUTPUT codec mode: %d\n", ctx->vpu_src_fmt->codec_mode);
        vpu_debug(0, "fmt - w: %d, h: %d\n",
                  pix_mp->width, pix_mp->height);
        return 0;
}

static int hantro_set_fmt_cap(struct hantro_ctx *ctx,
                              struct v4l2_pix_format_mplane *pix_mp)
{
        struct vb2_queue *vq;
        int ret;

        /* Change not allowed if queue is busy. */
        vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
                             V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
        if (vb2_is_busy(vq))
                return -EBUSY;

        if (ctx->is_encoder) {
                struct vb2_queue *peer_vq;

                /*
                 * Since format change on the CAPTURE queue will reset
                 * the OUTPUT queue, we can't allow doing so
                 * when the OUTPUT queue has buffers allocated.
                 */
                peer_vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
                                          V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
                if (vb2_is_busy(peer_vq) &&
                    (pix_mp->pixelformat != ctx->dst_fmt.pixelformat ||
                     pix_mp->height != ctx->dst_fmt.height ||
                     pix_mp->width != ctx->dst_fmt.width))
                        return -EBUSY;
        }

        ret = hantro_try_fmt(ctx, pix_mp, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
        if (ret)
                return ret;

        ctx->vpu_dst_fmt = hantro_find_format(ctx, pix_mp->pixelformat);
        ctx->dst_fmt = *pix_mp;

        /*
         * Current raw format might have become invalid with newly
         * selected codec, so reset it to default just to be safe and
         * keep internal driver state sane. User is mandated to set
         * the raw format again after we return, so we don't need
         * anything smarter.
         * Note that hantro_reset_raw_fmt() also propagates size
         * changes to the raw format.
         */
        if (ctx->is_encoder)
                hantro_reset_raw_fmt(ctx);

        /* Colorimetry information are always propagated. */
        ctx->src_fmt.colorspace = pix_mp->colorspace;
        ctx->src_fmt.ycbcr_enc = pix_mp->ycbcr_enc;
        ctx->src_fmt.xfer_func = pix_mp->xfer_func;
        ctx->src_fmt.quantization = pix_mp->quantization;

        vpu_debug(0, "CAPTURE codec mode: %d\n", ctx->vpu_dst_fmt->codec_mode);
        vpu_debug(0, "fmt - w: %d, h: %d\n",
                  pix_mp->width, pix_mp->height);

        hantro_update_requires_request(ctx, pix_mp->pixelformat);

        return 0;
}

static int
vidioc_s_fmt_out_mplane(struct file *file, void *priv, struct v4l2_format *f)
{
        return hantro_set_fmt_out(fh_to_ctx(priv), &f->fmt.pix_mp);
}

static int
vidioc_s_fmt_cap_mplane(struct file *file, void *priv, struct v4l2_format *f)
{
        return hantro_set_fmt_cap(fh_to_ctx(priv), &f->fmt.pix_mp);
}

const struct v4l2_ioctl_ops hantro_ioctl_ops = {
        .vidioc_querycap = vidioc_querycap,
        .vidioc_enum_framesizes = vidioc_enum_framesizes,

        .vidioc_try_fmt_vid_cap_mplane = vidioc_try_fmt_cap_mplane,
        .vidioc_try_fmt_vid_out_mplane = vidioc_try_fmt_out_mplane,
        .vidioc_s_fmt_vid_out_mplane = vidioc_s_fmt_out_mplane,
        .vidioc_s_fmt_vid_cap_mplane = vidioc_s_fmt_cap_mplane,
        .vidioc_g_fmt_vid_out_mplane = vidioc_g_fmt_out_mplane,
        .vidioc_g_fmt_vid_cap_mplane = vidioc_g_fmt_cap_mplane,
        .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
        .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,

        .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_subscribe_event = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event = v4l2_event_unsubscribe,

        .vidioc_streamon = v4l2_m2m_ioctl_streamon,
        .vidioc_streamoff = v4l2_m2m_ioctl_streamoff,
};

static int
hantro_queue_setup(struct vb2_queue *vq, unsigned int *num_buffers,
                   unsigned int *num_planes, unsigned int sizes[],
                   struct device *alloc_devs[])
{
        struct hantro_ctx *ctx = vb2_get_drv_priv(vq);
        struct v4l2_pix_format_mplane *pixfmt;
        int i;

        switch (vq->type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
                pixfmt = &ctx->dst_fmt;
                break;
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
                pixfmt = &ctx->src_fmt;
                break;
        default:
                vpu_err("invalid queue type: %d\n", vq->type);
                return -EINVAL;
        }

        if (*num_planes) {
                if (*num_planes != pixfmt->num_planes)
                        return -EINVAL;
                for (i = 0; i < pixfmt->num_planes; ++i)
                        if (sizes[i] < pixfmt->plane_fmt[i].sizeimage)
                                return -EINVAL;
                return 0;
        }

        *num_planes = pixfmt->num_planes;
        for (i = 0; i < pixfmt->num_planes; ++i)
                sizes[i] = pixfmt->plane_fmt[i].sizeimage;
        return 0;
}

static int
hantro_buf_plane_check(struct vb2_buffer *vb,
                       struct v4l2_pix_format_mplane *pixfmt)
{
        unsigned int sz;
        int i;

        for (i = 0; i < pixfmt->num_planes; ++i) {
                sz = pixfmt->plane_fmt[i].sizeimage;
                vpu_debug(4, "plane %d size: %ld, sizeimage: %u\n",
                          i, vb2_plane_size(vb, i), sz);
                if (vb2_plane_size(vb, i) < sz) {
                        vpu_err("plane %d is too small for output\n", i);
                        return -EINVAL;
                }
        }
        return 0;
}

static int hantro_buf_prepare(struct vb2_buffer *vb)
{
        struct vb2_queue *vq = vb->vb2_queue;
        struct hantro_ctx *ctx = vb2_get_drv_priv(vq);
        struct v4l2_pix_format_mplane *pix_fmt;
        int ret;

        if (V4L2_TYPE_IS_OUTPUT(vq->type))
                pix_fmt = &ctx->src_fmt;
        else
                pix_fmt = &ctx->dst_fmt;
        ret = hantro_buf_plane_check(vb, pix_fmt);
        if (ret)
                return ret;
        vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
        return 0;
}

static void hantro_buf_queue(struct vb2_buffer *vb)
{
        struct hantro_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);

        v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
}

static bool hantro_vq_is_coded(struct vb2_queue *q)
{
        struct hantro_ctx *ctx = vb2_get_drv_priv(q);

        return ctx->is_encoder != V4L2_TYPE_IS_OUTPUT(q->type);
}

static int hantro_start_streaming(struct vb2_queue *q, unsigned int count)
{
        struct hantro_ctx *ctx = vb2_get_drv_priv(q);
        int ret = 0;

        if (V4L2_TYPE_IS_OUTPUT(q->type))
                ctx->sequence_out = 0;
        else
                ctx->sequence_cap = 0;

        if (hantro_vq_is_coded(q)) {
                enum hantro_codec_mode codec_mode;

                if (V4L2_TYPE_IS_OUTPUT(q->type))
                        codec_mode = ctx->vpu_src_fmt->codec_mode;
                else
                        codec_mode = ctx->vpu_dst_fmt->codec_mode;

                vpu_debug(4, "Codec mode = %d\n", codec_mode);
                ctx->codec_ops = &ctx->dev->variant->codec_ops[codec_mode];
                if (ctx->codec_ops->init) {
                        ret = ctx->codec_ops->init(ctx);
                        if (ret)
                                return ret;
                }

                if (hantro_needs_postproc(ctx, ctx->vpu_dst_fmt)) {
                        ret = hantro_postproc_alloc(ctx);
                        if (ret)
                                goto err_codec_exit;
                }
        }
        return ret;

err_codec_exit:
        if (ctx->codec_ops->exit)
                ctx->codec_ops->exit(ctx);
        return ret;
}

static void
hantro_return_bufs(struct vb2_queue *q,
                   struct vb2_v4l2_buffer *(*buf_remove)(struct v4l2_m2m_ctx *))
{
        struct hantro_ctx *ctx = vb2_get_drv_priv(q);

        for (;;) {
                struct vb2_v4l2_buffer *vbuf;

                vbuf = buf_remove(ctx->fh.m2m_ctx);
                if (!vbuf)
                        break;
                v4l2_ctrl_request_complete(vbuf->vb2_buf.req_obj.req,
                                           &ctx->ctrl_handler);
                v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
        }
}

static void hantro_stop_streaming(struct vb2_queue *q)
{
        struct hantro_ctx *ctx = vb2_get_drv_priv(q);

        if (hantro_vq_is_coded(q)) {
                hantro_postproc_free(ctx);
                if (ctx->codec_ops && ctx->codec_ops->exit)
                        ctx->codec_ops->exit(ctx);
        }

        /*
         * The mem2mem framework calls v4l2_m2m_cancel_job before
         * .stop_streaming, so there isn't any job running and
         * it is safe to return all the buffers.
         */
        if (V4L2_TYPE_IS_OUTPUT(q->type))
                hantro_return_bufs(q, v4l2_m2m_src_buf_remove);
        else
                hantro_return_bufs(q, v4l2_m2m_dst_buf_remove);
}

static void hantro_buf_request_complete(struct vb2_buffer *vb)
{
        struct hantro_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);

        v4l2_ctrl_request_complete(vb->req_obj.req, &ctx->ctrl_handler);
}

static int hantro_buf_out_validate(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);

        vbuf->field = V4L2_FIELD_NONE;
        return 0;
}

const struct vb2_ops hantro_queue_ops = {
        .queue_setup = hantro_queue_setup,
        .buf_prepare = hantro_buf_prepare,
        .buf_queue = hantro_buf_queue,
        .buf_out_validate = hantro_buf_out_validate,
        .buf_request_complete = hantro_buf_request_complete,
        .start_streaming = hantro_start_streaming,
        .stop_streaming = hantro_stop_streaming,
        .wait_prepare = vb2_ops_wait_prepare,
        .wait_finish = vb2_ops_wait_finish,
};