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Message-ID: <f1e11d2192dcb9ce0b792c3640924881b634d776.camel@ndufresne.ca>
Subject: Re: [PATCH v9 06/13] media: amphion: add vpu v4l2 m2m support
From:   Nicolas Dufresne <nicolas@ndufresne.ca>
To:     Ming Qian <ming.qian@nxp.com>, mchehab@kernel.org,
        shawnguo@kernel.org, robh+dt@kernel.org, s.hauer@pengutronix.de
Cc:     hverkuil-cisco@xs4all.nl, kernel@pengutronix.de,
        festevam@gmail.com, linux-imx@nxp.com, aisheng.dong@nxp.com,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Date:   Thu, 23 Sep 2021 10:39:32 -0400
In-Reply-To: <4142cb1f597a3fbb176cf18c6a3d6356cc0d4064.1631521295.git.ming.qian@nxp.com>
References: <cover.1631521295.git.ming.qian@nxp.com>
         <4142cb1f597a3fbb176cf18c6a3d6356cc0d4064.1631521295.git.ming.qian@nxp.com>
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Le lundi 13 septembre 2021 à 17:11 +0800, Ming Qian a écrit :
> vpu_v4l2.c implements the v4l2 m2m driver methods.
> vpu_helpers.c implements the common helper functions
> vpu_color.c converts the v4l2 colorspace with iso
> 
> Signed-off-by: Ming Qian <ming.qian@nxp.com>
> Signed-off-by: Shijie Qin <shijie.qin@nxp.com>
> Signed-off-by: Zhou Peng <eagle.zhou@nxp.com>
> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  drivers/media/platform/amphion/vpu_color.c   | 192 ++++++
>  drivers/media/platform/amphion/vpu_helpers.c | 453 ++++++++++++++
>  drivers/media/platform/amphion/vpu_helpers.h |  72 +++
>  drivers/media/platform/amphion/vpu_v4l2.c    | 625 +++++++++++++++++++
>  drivers/media/platform/amphion/vpu_v4l2.h    |  53 ++
>  5 files changed, 1395 insertions(+)
>  create mode 100644 drivers/media/platform/amphion/vpu_color.c
>  create mode 100644 drivers/media/platform/amphion/vpu_helpers.c
>  create mode 100644 drivers/media/platform/amphion/vpu_helpers.h
>  create mode 100644 drivers/media/platform/amphion/vpu_v4l2.c
>  create mode 100644 drivers/media/platform/amphion/vpu_v4l2.h
> 
> diff --git a/drivers/media/platform/amphion/vpu_color.c b/drivers/media/platform/amphion/vpu_color.c
> new file mode 100644
> index 000000000000..29d1d5edc901
> --- /dev/null
> +++ b/drivers/media/platform/amphion/vpu_color.c
> @@ -0,0 +1,192 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2020-2021 NXP
> + */
> +
> +#define TAG		"COLOR"
> +
> +#include <linux/init.h>
> +#include <linux/device.h>
> +#include <linux/ioctl.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/types.h>
> +#include <media/v4l2-device.h>
> +#include "vpu.h"
> +#include "vpu_helpers.h"
> +
> +static const u8 colorprimaries[] = {
> +	0,
> +	V4L2_COLORSPACE_REC709,        /*Rec. ITU-R BT.709-6*/
> +	0,
> +	0,
> +	V4L2_COLORSPACE_470_SYSTEM_M, /*Rec. ITU-R BT.470-6 System M*/
> +	V4L2_COLORSPACE_470_SYSTEM_BG,/*Rec. ITU-R BT.470-6 System B, G*/
> +	V4L2_COLORSPACE_SMPTE170M,    /*SMPTE170M*/
> +	V4L2_COLORSPACE_SMPTE240M,    /*SMPTE240M*/
> +	0,                            /*Generic film*/
> +	V4L2_COLORSPACE_BT2020,       /*Rec. ITU-R BT.2020-2*/
> +	0,                            /*SMPTE ST 428-1*/
> +};
> +
> +static const u8 colortransfers[] = {
> +	0,
> +	V4L2_XFER_FUNC_709,      /*Rec. ITU-R BT.709-6*/
> +	0,
> +	0,
> +	0,                       /*Rec. ITU-R BT.470-6 System M*/
> +	0,                       /*Rec. ITU-R BT.470-6 System B, G*/
> +	V4L2_XFER_FUNC_709,      /*SMPTE170M*/
> +	V4L2_XFER_FUNC_SMPTE240M,/*SMPTE240M*/
> +	V4L2_XFER_FUNC_NONE,     /*Linear transfer characteristics*/
> +	0,
> +	0,
> +	0,                       /*IEC 61966-2-4*/
> +	0,                       /*Rec. ITU-R BT.1361-0 extended colour gamut*/
> +	V4L2_XFER_FUNC_SRGB,     /*IEC 61966-2-1 sRGB or sYCC*/
> +	V4L2_XFER_FUNC_709,      /*Rec. ITU-R BT.2020-2 (10 bit system)*/
> +	V4L2_XFER_FUNC_709,      /*Rec. ITU-R BT.2020-2 (12 bit system)*/
> +	V4L2_XFER_FUNC_SMPTE2084,/*SMPTE ST 2084*/
> +	0,                       /*SMPTE ST 428-1*/
> +	0                        /*Rec. ITU-R BT.2100-0 hybrid log-gamma (HLG)*/
> +};
> +
> +static const u8 colormatrixcoefs[] = {
> +	0,
> +	V4L2_YCBCR_ENC_709,             /*Rec. ITU-R BT.709-6*/
> +	0,
> +	0,
> +	0,                              /*Title 47 Code of Federal Regulations*/
> +	V4L2_YCBCR_ENC_601,             /*Rec. ITU-R BT.601-7 625*/
> +	V4L2_YCBCR_ENC_601,             /*Rec. ITU-R BT.601-7 525*/
> +	V4L2_YCBCR_ENC_SMPTE240M,       /*SMPTE240M*/
> +	0,
> +	V4L2_YCBCR_ENC_BT2020,          /*Rec. ITU-R BT.2020-2*/
> +	V4L2_YCBCR_ENC_BT2020_CONST_LUM /*Rec. ITU-R BT.2020-2 constant*/
> +};
> +
> +u32 vpu_color_cvrt_primaries_v2i(u32 primaries)
> +{
> +	return VPU_ARRAY_FIND(colorprimaries, primaries);
> +}
> +
> +u32 vpu_color_cvrt_primaries_i2v(u32 primaries)
> +{
> +	return VPU_ARRAY_AT(colorprimaries, primaries);
> +}
> +
> +u32 vpu_color_cvrt_transfers_v2i(u32 transfers)
> +{
> +	return VPU_ARRAY_FIND(colortransfers, transfers);
> +}
> +
> +u32 vpu_color_cvrt_transfers_i2v(u32 transfers)
> +{
> +	return VPU_ARRAY_AT(colortransfers, transfers);
> +}
> +
> +u32 vpu_color_cvrt_matrix_v2i(u32 matrix)
> +{
> +	return VPU_ARRAY_FIND(colormatrixcoefs, matrix);
> +}
> +
> +u32 vpu_color_cvrt_matrix_i2v(u32 matrix)
> +{
> +	return VPU_ARRAY_AT(colormatrixcoefs, matrix);
> +}
> +
> +u32 vpu_color_cvrt_full_range_v2i(u32 full_range)
> +{
> +	return (full_range == V4L2_QUANTIZATION_FULL_RANGE);
> +}
> +
> +u32 vpu_color_cvrt_full_range_i2v(u32 full_range)
> +{
> +	if (full_range)
> +		return V4L2_QUANTIZATION_FULL_RANGE;
> +
> +	return V4L2_QUANTIZATION_LIM_RANGE;
> +}
> +
> +int vpu_color_check_primaries(u32 primaries)
> +{
> +	return vpu_color_cvrt_primaries_v2i(primaries) ? 0 : -EINVAL;
> +}
> +
> +int vpu_color_check_transfers(u32 transfers)
> +{
> +	return vpu_color_cvrt_transfers_v2i(transfers) ? 0 : -EINVAL;
> +}
> +
> +int vpu_color_check_matrix(u32 matrix)
> +{
> +	return vpu_color_cvrt_matrix_v2i(matrix) ? 0 : -EINVAL;
> +}
> +
> +int vpu_color_check_full_range(u32 full_range)
> +{
> +	int ret = -EINVAL;
> +
> +	switch (full_range) {
> +	case V4L2_QUANTIZATION_FULL_RANGE:
> +	case V4L2_QUANTIZATION_LIM_RANGE:
> +		ret = 0;
> +		break;
> +	default:
> +		break;
> +
> +	}
> +
> +	return ret;
> +}
> +
> +int vpu_color_get_default(u32 primaries,
> +		u32 *ptransfers, u32 *pmatrix, u32 *pfull_range)
> +{
> +	u32 transfers;
> +	u32 matrix;
> +	u32 full_range;
> +
> +	switch (primaries) {
> +	case V4L2_COLORSPACE_REC709:
> +		transfers = V4L2_XFER_FUNC_709;
> +		matrix = V4L2_YCBCR_ENC_709;
> +		full_range = V4L2_QUANTIZATION_LIM_RANGE;
> +		break;
> +	case V4L2_COLORSPACE_470_SYSTEM_M:
> +	case V4L2_COLORSPACE_470_SYSTEM_BG:
> +	case V4L2_COLORSPACE_SMPTE170M:
> +		transfers = V4L2_XFER_FUNC_709;
> +		matrix = V4L2_YCBCR_ENC_601;
> +		full_range = V4L2_QUANTIZATION_LIM_RANGE;
> +		break;
> +	case V4L2_COLORSPACE_SMPTE240M:
> +		transfers = V4L2_XFER_FUNC_SMPTE240M;
> +		matrix = V4L2_YCBCR_ENC_SMPTE240M;
> +		full_range = V4L2_QUANTIZATION_LIM_RANGE;
> +		break;
> +	case V4L2_COLORSPACE_BT2020:
> +		transfers = V4L2_XFER_FUNC_709;
> +		matrix = V4L2_YCBCR_ENC_BT2020;
> +		full_range = V4L2_QUANTIZATION_LIM_RANGE;
> +		break;
> +	default:
> +		transfers = V4L2_XFER_FUNC_709;
> +		matrix = V4L2_YCBCR_ENC_709;
> +		full_range = V4L2_QUANTIZATION_LIM_RANGE;
> +		break;
> +	}
> +
> +	if (ptransfers)
> +		*ptransfers = transfers;
> +	if (pmatrix)
> +		*pmatrix = matrix;
> +	if (pfull_range)
> +		*pfull_range = full_range;
> +
> +
> +	return 0;
> +}
> diff --git a/drivers/media/platform/amphion/vpu_helpers.c b/drivers/media/platform/amphion/vpu_helpers.c
> new file mode 100644
> index 000000000000..484575d2975e
> --- /dev/null
> +++ b/drivers/media/platform/amphion/vpu_helpers.c
> @@ -0,0 +1,453 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2020-2021 NXP
> + */
> +
> +#define TAG		"HELPER"
> +#include <linux/init.h>
> +#include <linux/interconnect.h>
> +#include <linux/ioctl.h>
> +#include <linux/list.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include "vpu.h"
> +#include "vpu_core.h"
> +#include "vpu_rpc.h"
> +#include "vpu_helpers.h"
> +#include "vpu_log.h"
> +
> +int vpu_helper_find_in_array_u8(const u8 *array, u32 size, u32 x)
> +{
> +	int i;
> +
> +	for (i = 0; i < size; i++) {
> +		if (array[i] == x)
> +			return i;
> +	}
> +
> +	return 0;
> +}
> +
> +bool vpu_helper_check_type(struct vpu_inst *inst, u32 type)
> +{
> +	const struct vpu_format *pfmt;
> +
> +	for (pfmt = inst->formats; pfmt->pixfmt; pfmt++) {
> +		if (vpu_core_check_fmt(inst->core, pfmt->pixfmt))
> +			continue;
> +		if (pfmt->type == type)
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
> +const struct vpu_format *vpu_helper_find_format(struct vpu_inst *inst, u32 type, u32 pixelfmt)
> +{
> +	const struct vpu_format *pfmt;
> +
> +	if (!inst || !inst->formats)
> +		return NULL;
> +
> +	if (vpu_core_check_fmt(inst->core, pixelfmt))
> +		return NULL;
> +
> +	for (pfmt = inst->formats; pfmt->pixfmt; pfmt++) {
> +		if (vpu_core_check_fmt(inst->core, pfmt->pixfmt))
> +			continue;
> +
> +		if (pfmt->pixfmt == pixelfmt && (!type || type == pfmt->type))
> +			return pfmt;
> +	}
> +
> +	return NULL;
> +}
> +
> +const struct vpu_format *vpu_helper_enum_format(struct vpu_inst *inst, u32 type, int index)
> +{
> +	const struct vpu_format *pfmt;
> +	int i = 0;
> +
> +	if (!inst || !inst->formats)
> +		return NULL;
> +
> +	for (pfmt = inst->formats; pfmt->pixfmt; pfmt++) {
> +		if (vpu_core_check_fmt(inst->core, pfmt->pixfmt))
> +			continue;
> +
> +		if (pfmt->type == type) {
> +			if (index == i)
> +				return pfmt;
> +			i++;
> +		}
> +	}
> +
> +	return NULL;
> +}
> +
> +u32 vpu_helper_valid_frame_width(struct vpu_inst *inst, u32 width)
> +{
> +	const struct vpu_core_resources *res;
> +
> +	if (!inst || !inst->core || !inst->core->res)
> +		return width;
> +
> +	res = inst->core->res;
> +	if (res->max_width)
> +		width = clamp(width, res->min_width, res->max_width);
> +	if (res->step_width)
> +		width = ALIGN(width, res->step_width);
> +
> +	return width;
> +}
> +
> +u32 vpu_helper_valid_frame_height(struct vpu_inst *inst, u32 height)
> +{
> +	const struct vpu_core_resources *res;
> +
> +	if (!inst || !inst->core || !inst->core->res)
> +		return height;
> +
> +	res = inst->core->res;
> +	if (res->max_height)
> +		height = clamp(height, res->min_height, res->max_height);
> +	if (res->step_height)
> +		height = ALIGN(height, res->step_height);
> +
> +	return height;
> +}
> +
> +u32 vpu_helper_get_frame_size(u32 fmt, u32 width, u32 height)
> +{
> +	switch (fmt) {
> +	case V4L2_PIX_FMT_NV12:
> +		return ((width * 3) >> 1) * height;
> +	default:
> +		return width * height;
> +	}
> +}
> +
> +static u32 get_nv12_plane_size(u32 width, u32 height, int plane_no,
> +			u32 stride, u32 interlaced, u32 *pbl)
> +{
> +	u32 bytesperline;
> +	u32 size = 0;
> +
> +	bytesperline = ALIGN(width, stride);
> +	height = ALIGN(height, 2);
> +	if (plane_no == 0)
> +		size = bytesperline * height;
> +	else
> +		size = bytesperline * height >> 1;
> +
> +	if (pbl)
> +		*pbl = bytesperline;
> +
> +	return size;
> +}
> +
> +static u32 get_tiled_8l128_plane_size(u32 fmt, u32 width, u32 height, int plane_no,
> +			u32 stride, u32 interlaced, u32 *pbl)
> +{
> +	u32 ws = 3;
> +	u32 hs = 7;
> +	u32 bitdepth = 8;
> +	u32 bytesperline;
> +	u32 size = 0;
> +
> +	if (interlaced)
> +		hs++;
> +	if (fmt == V4L2_PIX_FMT_NV12_10BE_8L128)
> +		bitdepth = 10;
> +	bytesperline = DIV_ROUND_UP(width * bitdepth, BITS_PER_BYTE);
> +	bytesperline = ALIGN(bytesperline, 1 << ws);
> +	bytesperline = ALIGN(bytesperline, stride);
> +	height = ALIGN(height, 1 << hs);
> +	if (plane_no == 0)
> +		size = bytesperline * height;
> +	else if (plane_no == 1)
> +		size = (bytesperline * ALIGN(height, 1 << (hs + 1))) >> 1;
> +
> +	if (pbl)
> +		*pbl = bytesperline;
> +
> +	return size;
> +}
> +
> +static u32 get_default_plane_size(u32 width, u32 height, int plane_no,
> +			u32 stride, u32 interlaced, u32 *pbl)
> +{
> +	u32 bytesperline;
> +	u32 size = 0;
> +
> +	bytesperline = ALIGN(width, stride);
> +	if (plane_no == 0)
> +		size = bytesperline * height;
> +
> +	if (pbl)
> +		*pbl = bytesperline;
> +
> +	return size;
> +}
> +
> +u32 vpu_helper_get_plane_size(u32 fmt, u32 w, u32 h, int plane_no,
> +		u32 stride, u32 interlaced, u32 *pbl)
> +{
> +	switch (fmt) {
> +	case V4L2_PIX_FMT_NV12:
> +		return get_nv12_plane_size(w, h, plane_no, stride, interlaced, pbl);
> +	case V4L2_PIX_FMT_NV12_8L128:
> +	case V4L2_PIX_FMT_NV12_10BE_8L128:
> +		return get_tiled_8l128_plane_size(fmt, w, h, plane_no, stride, interlaced, pbl);
> +	default:
> +		return get_default_plane_size(w, h, plane_no, stride, interlaced, pbl);
> +	}
> +}
> +
> +u32 vpu_helper_copy_from_stream_buffer(struct vpu_buffer *stream_buffer,
> +					u32 *rptr, u32 size, void *dst)
> +{
> +	u32 offset;
> +	u32 start;
> +	u32 end;
> +	void *virt;
> +
> +	if (!stream_buffer || !rptr || !dst)
> +		return -EINVAL;
> +
> +	if (!size)
> +		return 0;
> +
> +	offset = *rptr;
> +	start = stream_buffer->phys;
> +	end = start + stream_buffer->length;
> +	virt = stream_buffer->virt;
> +
> +	if (offset < start || offset > end) {
> +		vpu_err("rptr 0x%x is out of range [0x%x, 0x%x]\n",
> +				offset, start, end);
> +		return -EINVAL;
> +	}
> +
> +	if (offset + size <= end) {
> +		memcpy(dst, virt + (offset - start), size);
> +	} else {
> +		memcpy(dst, virt + (offset - start), end - offset);
> +		memcpy(dst + end - offset, virt, size + offset - end);
> +	}
> +
> +	*rptr = vpu_helper_step_walk(stream_buffer, offset, size);
> +	return size;
> +}
> +
> +u32 vpu_helper_copy_to_stream_buffer(struct vpu_buffer *stream_buffer,
> +				u32 *wptr, u32 size, void *src)
> +{
> +	u32 offset;
> +	u32 start;
> +	u32 end;
> +	void *virt;
> +
> +	if (!stream_buffer || !wptr || !src)
> +		return -EINVAL;
> +
> +	if (!size)
> +		return 0;
> +
> +	offset = *wptr;
> +	start = stream_buffer->phys;
> +	end = start + stream_buffer->length;
> +	virt = stream_buffer->virt;
> +	if (offset < start || offset > end) {
> +		vpu_err("wptr 0x%x is out of range [0x%x, 0x%x]\n",
> +				offset, start, end);
> +		return -EINVAL;
> +	}
> +
> +	if (offset + size <= end) {
> +		memcpy(virt + (offset - start), src, size);
> +	} else {
> +		memcpy(virt + (offset - start), src, end - offset);
> +		memcpy(virt, src + end - offset, size + offset - end);
> +	}
> +
> +	*wptr = vpu_helper_step_walk(stream_buffer, offset, size);
> +
> +	return size;
> +}
> +
> +u32 vpu_helper_memset_stream_buffer(struct vpu_buffer *stream_buffer,
> +				u32 *wptr, u8 val, u32 size)
> +{
> +	u32 offset;
> +	u32 start;
> +	u32 end;
> +	void *virt;
> +
> +	if (!stream_buffer || !wptr)
> +		return -EINVAL;
> +
> +	if (!size)
> +		return 0;
> +
> +	offset = *wptr;
> +	start = stream_buffer->phys;
> +	end = start + stream_buffer->length;
> +	virt = stream_buffer->virt;
> +	if (offset < start || offset > end) {
> +		vpu_err("wptr 0x%x is out of range [0x%x, 0x%x]\n",
> +				offset, start, end);
> +		return -EINVAL;
> +	}
> +
> +	if (offset + size <= end) {
> +		memset(virt + (offset - start), val, size);
> +	} else {
> +		memset(virt + (offset - start), val, end - offset);
> +		memset(virt, val, size + offset - end);
> +	}
> +
> +	offset += size;
> +	if (offset >= end)
> +		offset -= stream_buffer->length;
> +
> +	*wptr = offset;
> +
> +	return size;
> +}
> +
> +u32 vpu_helper_get_free_space(struct vpu_inst *inst)
> +{
> +	struct vpu_rpc_buffer_desc desc;
> +
> +	if (vpu_iface_get_stream_buffer_desc(inst, &desc))
> +		return 0;
> +
> +	if (desc.rptr > desc.wptr)
> +		return desc.rptr - desc.wptr;
> +	else if (desc.rptr < desc.wptr)
> +		return (desc.end - desc.start + desc.rptr - desc.wptr);
> +	else
> +		return desc.end - desc.start;
> +}
> +
> +u32 vpu_helper_get_used_space(struct vpu_inst *inst)
> +{
> +	struct vpu_rpc_buffer_desc desc;
> +
> +	if (vpu_iface_get_stream_buffer_desc(inst, &desc))
> +		return 0;
> +
> +	if (desc.wptr > desc.rptr)
> +		return desc.wptr - desc.rptr;
> +	else if (desc.wptr < desc.rptr)
> +		return (desc.end - desc.start + desc.wptr - desc.rptr);
> +	else
> +		return 0;
> +}
> +
> +int vpu_helper_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct vpu_inst *inst = ctrl_to_inst(ctrl);
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
> +		ctrl->val = inst->min_buffer_cap;
> +		break;
> +	case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
> +		ctrl->val = inst->min_buffer_out;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +u32 vpu_helper_calc_coprime(u32 *a, u32 *b)
> +{
> +	int m = *a;
> +	int n = *b;
> +
> +	if (m == 0)
> +		return n;
> +	if (n == 0)
> +		return m;
> +
> +	while (n != 0) {
> +		int tmp = m % n;
> +
> +		m = n;
> +		n = tmp;
> +	}
> +	*a = (*a) / m;
> +	*b = (*b) / m;
> +
> +	return m;
> +}
> +
> +#define READ_BYTE(buffer, pos)	(*(u8 *)((buffer)->virt + ((pos) % buffer->length)))
> +int vpu_helper_find_startcode(struct vpu_buffer *stream_buffer,
> +			u32 pixelformat, u32 offset, u32 bytesused)
> +{
> +	u32 start_code;
> +	int start_code_size;
> +	u32 val = 0;
> +	int i;
> +	int ret = -EINVAL;
> +
> +	if (!stream_buffer || !stream_buffer->virt)
> +		return -EINVAL;
> +
> +	switch (pixelformat) {
> +	case V4L2_PIX_FMT_H264:
> +		start_code_size = 4;
> +		start_code = 0x00000001;
> +		break;
> +	default:
> +		return 0;
> +	}
> +
> +	for (i = 0; i < bytesused; i++) {
> +		val = (val << 8) | READ_BYTE(stream_buffer, offset + i);
> +		if (i < start_code_size - 1)
> +			continue;
> +		if (val == start_code) {
> +			ret = i + 1 - start_code_size;
> +			break;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +int vpu_find_dst_by_src(struct vpu_pair *pairs, u32 cnt, u32 src)
> +{
> +	u32 i;
> +
> +	if (!pairs || !cnt)
> +		return -EINVAL;
> +
> +	for (i = 0; i < cnt; i++) {
> +		if (pairs[i].src == src)
> +			return pairs[i].dst;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +int vpu_find_src_by_dst(struct vpu_pair *pairs, u32 cnt, u32 dst)
> +{
> +	u32 i;
> +
> +	if (!pairs || !cnt)
> +		return -EINVAL;
> +
> +	for (i = 0; i < cnt; i++) {
> +		if (pairs[i].dst == dst)
> +			return pairs[i].src;
> +	}
> +
> +	return -EINVAL;
> +}
> diff --git a/drivers/media/platform/amphion/vpu_helpers.h b/drivers/media/platform/amphion/vpu_helpers.h
> new file mode 100644
> index 000000000000..22029eab7b56
> --- /dev/null
> +++ b/drivers/media/platform/amphion/vpu_helpers.h
> @@ -0,0 +1,72 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2020-2021 NXP
> + */
> +
> +#ifndef _AMPHION_VPU_HELPERS_H
> +#define _AMPHION_VPU_HELPERS_H
> +
> +struct vpu_pair {
> +	u32 src;
> +	u32 dst;
> +};
> +
> +#define MAKE_TIMESTAMP(s, ns)		(((s32)(s) * NSEC_PER_SEC) + (ns))
> +#define VPU_INVALID_TIMESTAMP		MAKE_TIMESTAMP(-1, 0)
> +#define	VPU_ARRAY_AT(array, i)		(((i) < ARRAY_SIZE(array)) ? array[i] : 0)
> +#define VPU_ARRAY_FIND(array, x)	vpu_helper_find_in_array_u8(array, ARRAY_SIZE(array), x)
> +
> +int vpu_helper_find_in_array_u8(const u8 *array, u32 size, u32 x);
> +bool vpu_helper_check_type(struct vpu_inst *inst, u32 type);
> +const struct vpu_format *vpu_helper_find_format(struct vpu_inst *inst, u32 type, u32 pixelfmt);
> +const struct vpu_format *vpu_helper_enum_format(struct vpu_inst *inst, u32 type, int index);
> +u32 vpu_helper_valid_frame_width(struct vpu_inst *inst, u32 width);
> +u32 vpu_helper_valid_frame_height(struct vpu_inst *inst, u32 height);
> +u32 vpu_helper_get_frame_size(u32 fmt, u32 width, u32 height);
> +u32 vpu_helper_get_plane_size(u32 fmt, u32 width, u32 height, int plane_no,
> +					u32 stride, u32 interlaced, u32 *pbl);
> +u32 vpu_helper_copy_from_stream_buffer(struct vpu_buffer *stream_buffer,
> +					u32 *rptr, u32 size, void *dst);
> +u32 vpu_helper_copy_to_stream_buffer(struct vpu_buffer *stream_buffer,
> +				u32 *wptr, u32 size, void *src);
> +u32 vpu_helper_memset_stream_buffer(struct vpu_buffer *stream_buffer,
> +				u32 *wptr, u8 val, u32 size);
> +u32 vpu_helper_get_free_space(struct vpu_inst *inst);
> +u32 vpu_helper_get_used_space(struct vpu_inst *inst);
> +int vpu_helper_g_volatile_ctrl(struct v4l2_ctrl *ctrl);
> +u32 vpu_helper_calc_coprime(u32 *a, u32 *b);
> +void vpu_helper_get_kmp_next(const u8 *pattern, int *next, int size);
> +int vpu_helper_kmp_search(u8 *s, int s_len, const u8 *p, int p_len, int *next);
> +int vpu_helper_kmp_search_in_stream_buffer(struct vpu_buffer *stream_buffer,
> +					u32 offset, int bytesused,
> +					const u8 *p, int p_len, int *next);
> +int vpu_helper_find_startcode(struct vpu_buffer *stream_buffer,
> +			u32 pixelformat, u32 offset, u32 bytesused);
> +
> +static inline u32 vpu_helper_step_walk(struct vpu_buffer *stream_buffer, u32 pos, u32 step)
> +{
> +	pos += step;
> +	if (pos > stream_buffer->phys + stream_buffer->length)
> +		pos -= stream_buffer->length;
> +
> +	return pos;
> +}
> +
> +int vpu_color_check_primaries(u32 primaries);
> +int vpu_color_check_transfers(u32 transfers);
> +int vpu_color_check_matrix(u32 matrix);
> +int vpu_color_check_full_range(u32 full_range);
> +u32 vpu_color_cvrt_primaries_v2i(u32 primaries);
> +u32 vpu_color_cvrt_primaries_i2v(u32 primaries);
> +u32 vpu_color_cvrt_transfers_v2i(u32 transfers);
> +u32 vpu_color_cvrt_transfers_i2v(u32 transfers);
> +u32 vpu_color_cvrt_matrix_v2i(u32 matrix);
> +u32 vpu_color_cvrt_matrix_i2v(u32 matrix);
> +u32 vpu_color_cvrt_full_range_v2i(u32 full_range);
> +u32 vpu_color_cvrt_full_range_i2v(u32 full_range);
> +int vpu_color_get_default(u32 primaries,
> +		u32 *ptransfers, u32 *pmatrix, u32 *pfull_range);
> +
> +int vpu_find_dst_by_src(struct vpu_pair *pairs, u32 cnt, u32 src);
> +int vpu_find_src_by_dst(struct vpu_pair *pairs, u32 cnt, u32 dst);
> +#endif
> diff --git a/drivers/media/platform/amphion/vpu_v4l2.c b/drivers/media/platform/amphion/vpu_v4l2.c
> new file mode 100644
> index 000000000000..eb764c5d48e5
> --- /dev/null
> +++ b/drivers/media/platform/amphion/vpu_v4l2.c
> @@ -0,0 +1,625 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2020-2021 NXP
> + */
> +
> +#define TAG		"V4L2"
> +#include <linux/init.h>
> +#include <linux/interconnect.h>
> +#include <linux/ioctl.h>
> +#include <linux/list.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/videodev2.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-mem2mem.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-v4l2.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <media/videobuf2-vmalloc.h>
> +#include "vpu.h"
> +#include "vpu_core.h"
> +#include "vpu_v4l2.h"
> +#include "vpu_msgs.h"
> +#include "vpu_helpers.h"
> +#include "vpu_log.h"
> +
> +void vpu_inst_lock(struct vpu_inst *inst)
> +{
> +	mutex_lock(&inst->lock);
> +}
> +
> +void vpu_inst_unlock(struct vpu_inst *inst)
> +{
> +	mutex_unlock(&inst->lock);
> +}
> +
> +dma_addr_t vpu_get_vb_phy_addr(struct vb2_buffer *vb, u32 plane_no)
> +{
> +	return vb2_dma_contig_plane_dma_addr(vb, plane_no) +
> +			vb->planes[plane_no].data_offset;

I've change the num_planes to 1 (tried 2, but failed differently), and it
crashed while running:

GST_DEBUG="v4l2*:7" gst-launch-1.0 videotestsrc num-buffers=100 ! v4l2h264enc ! fakesink

So perhaps there is a overall review of the buffer allocation vs S_FMT
implementation to be done here.

[   81.520167] Unable to handle kernel NULL pointer dereference at virtual
address 0000000000000000
[   81.529168] Mem abort info:
[   81.532467]   ESR = 0x96000004
[   81.539550]   EC = 0x25: DABT (current EL), IL = 32 bits
[   81.546053]   SET = 0, FnV = 0
[   81.549771]   EA = 0, S1PTW = 0
[   81.553186]   FSC = 0x04: level 0 translation fault
[   81.558280] Data abort info:
[   81.561437]   ISV = 0, ISS = 0x00000004
[   81.565527]   CM = 0, WnR = 0
[   81.568581] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000882741000
[   81.575840] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
[   81.586637] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[   81.592247] Modules linked in: amphion_vpu_core v4l2_mem2mem
videobuf2_vmalloc videobuf2_dma_contig videobuf2_memops videobuf2_v4l2
videobuf2_common imx_sc_key imx_sc_thermal crct10dif_ce rtc_imx_sc imx_sc_wdt
amphion_vpu_dev fsl_imx8_ddr_perf isl29018 mpl3115 industrialio_triggered_buffer
kfifo_buf videodev mc fuse drm ip_tables x_tables ipv6
[   81.622805] CPU: 0 PID: 348 Comm: videotestsrc0:s Not tainted 5.15.0-rc2-
imx8qxp+ #2
[   81.630562] Hardware name: Freescale i.MX8QXP MEK (DT)
[   81.635711] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[   81.642687] pc : vpu_get_vb_phy_addr+0x28/0x50 [amphion_vpu_core]
[   81.648838] lr : vpu_get_vb_phy_addr+0x20/0x50 [amphion_vpu_core]
[   81.654971] sp : ffff800012fcba30
[   81.658287] x29: ffff800012fcba30 x28: ffff800012bd1040 x27: 0000000000000000
[   81.665449] x26: 0000000000000000 x25: ffff800012fcbd28 x24: ffff800012bd1010
[   81.672607] x23: ffff800012bd3200 x22: 0000000000000000 x21: ffff800015807044
[   81.679766] x20: ffff000806a1ec00 x19: 0000000000000003 x18: 0000000000000000
[   81.686924] x17: 0000000000000000 x16: 0000000000000000 x15: 0000a95ba29c327a
[   81.694083] x14: 000000000000039f x13: 0000000000000000 x12: 0000000000000000
[   81.701241] x11: 0000000000000000 x10: 0000000000000990 x9 : ffff800012fcb900
[   81.708400] x8 : ffff0008068f97f0 x7 : ffff00083f98b180 x6 : ffff000802070af8
[   81.715558] x5 : ffff000802070af8 x4 : ffff800009296000 x3 : ffff000802073480
[   81.722717] x2 : ffff000806a1ec00 x1 : 0000000000000002 x0 : 0000000000000000
[   81.729877] Call trace:
[   81.732332]  vpu_get_vb_phy_addr+0x28/0x50 [amphion_vpu_core]
[   81.738119]  vpu_windsor_input_frame+0x84/0xbc [amphion_vpu_core]
[   81.744252]  venc_process_output+0x88/0x10c [amphion_vpu_core]
[   81.750125]  vpu_process_output_buffer+0xac/0x100 [amphion_vpu_core]
[   81.756519]  venc_start_session+0x264/0x2cc [amphion_vpu_core]
[   81.762392]  vpu_vb2_start_streaming+0x88/0xf4 [amphion_vpu_core]
[   81.768525]  vb2_start_streaming+0x68/0x15c [videobuf2_common]
[   81.774398]  vb2_core_streamon+0x94/0x19c [videobuf2_common]
[   81.780088]  vb2_streamon+0x20/0x70 [videobuf2_v4l2]
[   81.785083]  v4l2_m2m_ioctl_streamon+0x3c/0xa0 [v4l2_mem2mem]
[   81.790869]  v4l_streamon+0x28/0x34 [videodev]
[   81.795412]  __video_do_ioctl+0x17c/0x3e0 [videodev]
[   81.800460]  video_usercopy+0x368/0x7e0 [videodev]
[   81.805333]  video_ioctl2+0x1c/0x3c [videodev]
[   81.809859]  v4l2_ioctl+0x44/0x64 [videodev]
[   81.814211]  __arm64_sys_ioctl+0xac/0xf0
[   81.818155]  invoke_syscall+0x48/0x114
[   81.821917]  el0_svc_common.constprop.0+0x44/0xfc
[   81.826635]  do_el0_svc+0x2c/0x94
[   81.829961]  el0_svc+0x28/0x80
[   81.833027]  el0t_64_sync_handler+0xa8/0x130
[   81.837311]  el0t_64_sync+0x1a0/0x1a4
[   81.840992] Code: aa0003f4 97ff02f9 d37f7e61 8b334033 (f9400000) 
[   81.847099] ---[ end trace 46cf421377a59de1 ]---


> +}
> +
> +unsigned int vpu_get_vb_length(struct vb2_buffer *vb, u32 plane_no)
> +{
> +	if (plane_no >= vb->num_planes)
> +		return 0;
> +	return vb2_plane_size(vb, plane_no) - vb->planes[plane_no].data_offset;
> +}
> +
> +void vpu_v4l2_set_error(struct vpu_inst *inst)
> +{
> +	struct vb2_queue *src_q = v4l2_m2m_get_src_vq(inst->m2m_ctx);
> +	struct vb2_queue *dst_q = v4l2_m2m_get_dst_vq(inst->m2m_ctx);
> +
> +	if (src_q)
> +		src_q->error = 1;
> +	if (dst_q)
> +		dst_q->error = 1;
> +}
> +
> +int vpu_notify_eos(struct vpu_inst *inst)
> +{
> +	const struct v4l2_event ev = {
> +		.id = 0,
> +		.type = V4L2_EVENT_EOS
> +	};
> +
> +	inst_dbg(inst, LVL_FLOW, "notify eos event\n");
> +	v4l2_event_queue_fh(&inst->fh, &ev);
> +
> +	return 0;
> +}
> +
> +int vpu_notify_source_change(struct vpu_inst *inst)
> +{
> +	const struct v4l2_event ev = {
> +		.id = 0,
> +		.type = V4L2_EVENT_SOURCE_CHANGE,
> +		.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION
> +	};
> +
> +	inst_dbg(inst, LVL_FLOW, "notify source change event\n");
> +	v4l2_event_queue_fh(&inst->fh, &ev);
> +	return 0;
> +}
> +
> +const struct vpu_format *vpu_try_fmt_common(struct vpu_inst *inst,
> +		 struct v4l2_format *f)
> +{
> +	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
> +	u32 type = f->type;
> +	u32 stride;
> +	u32 bytesperline;
> +	u32 sizeimage;
> +	const struct vpu_format *fmt;
> +	int i;
> +
> +	fmt = vpu_helper_find_format(inst, type, pixmp->pixelformat);
> +	if (!fmt) {
> +		fmt = vpu_helper_enum_format(inst, type, 0);
> +		if (!fmt)
> +			return NULL;
> +		pixmp->pixelformat = fmt->pixfmt;
> +	}
> +
> +	stride = inst->core->res->stride;
> +	pixmp->width = vpu_helper_valid_frame_width(inst, pixmp->width);
> +	pixmp->height = vpu_helper_valid_frame_height(inst, pixmp->height);
> +	pixmp->flags = fmt->flags;
> +	pixmp->num_planes = fmt->num_planes;
> +	if (pixmp->field == V4L2_FIELD_ANY)
> +		pixmp->field = V4L2_FIELD_NONE;
> +	for (i = 0; i < pixmp->num_planes; i++) {
> +		sizeimage = vpu_helper_get_plane_size(pixmp->pixelformat,
> +				pixmp->width, pixmp->height, i, stride,
> +				pixmp->field == V4L2_FIELD_INTERLACED ? 1 : 0,
> +				&bytesperline);
> +		if ((s32)(pixmp->plane_fmt[i].bytesperline) <= 0)
> +			pixmp->plane_fmt[i].bytesperline = bytesperline;
> +		if ((s32)(pixmp->plane_fmt[i].sizeimage) <= 0)
> +			pixmp->plane_fmt[i].sizeimage = sizeimage;
> +		if (pixmp->plane_fmt[i].bytesperline < bytesperline)
> +			pixmp->plane_fmt[i].bytesperline = bytesperline;
> +		if (pixmp->plane_fmt[i].sizeimage <= sizeimage)
> +			pixmp->plane_fmt[i].sizeimage = sizeimage;
> +	}
> +
> +	return fmt;
> +}
> +
> +static bool vpu_check_ready(struct vpu_inst *inst, u32 type)
> +{
> +	if (!inst)
> +		return false;
> +	if (inst->state == VPU_CODEC_STATE_DEINIT || inst->id < 0)
> +		return false;
> +	if (!inst->ops->check_ready)
> +		return true;
> +	return call_vop(inst, check_ready, type);
> +}
> +
> +int vpu_process_output_buffer(struct vpu_inst *inst)
> +{
> +	struct v4l2_m2m_buffer *buf = NULL;
> +	struct vpu_vb2_buffer *vpu_buf = NULL;
> +
> +	if (!inst)
> +		return -EINVAL;
> +
> +	if (!vpu_check_ready(inst, inst->out_format.type))
> +		return -EINVAL;
> +
> +	v4l2_m2m_for_each_src_buf(inst->m2m_ctx, buf) {
> +		vpu_buf = container_of(buf, struct vpu_vb2_buffer, m2m_buf);
> +		if (vpu_buf->state == VPU_BUF_STATE_IDLE)
> +			break;
> +		vpu_buf = NULL;
> +	}
> +
> +	if (!vpu_buf)
> +		return -EINVAL;
> +
> +	inst_dbg(inst, LVL_DEBUG, "frame id = %d / %d\n",
> +			vpu_buf->m2m_buf.vb.sequence, inst->sequence);
> +	return call_vop(inst, process_output, &vpu_buf->m2m_buf.vb.vb2_buf);
> +}
> +
> +int vpu_process_capture_buffer(struct vpu_inst *inst)
> +{
> +	struct v4l2_m2m_buffer *buf = NULL;
> +	struct vpu_vb2_buffer *vpu_buf = NULL;
> +
> +	if (!inst)
> +		return -EINVAL;
> +
> +	if (!vpu_check_ready(inst, inst->cap_format.type))
> +		return -EINVAL;
> +
> +	v4l2_m2m_for_each_dst_buf(inst->m2m_ctx, buf) {
> +		vpu_buf = container_of(buf, struct vpu_vb2_buffer, m2m_buf);
> +		if (vpu_buf->state == VPU_BUF_STATE_IDLE)
> +			break;
> +		vpu_buf = NULL;
> +	}
> +	if (!vpu_buf)
> +		return -EINVAL;
> +
> +	return call_vop(inst, process_capture, &vpu_buf->m2m_buf.vb.vb2_buf);
> +}
> +
> +struct vb2_v4l2_buffer *vpu_find_buf_by_sequence(struct vpu_inst *inst,
> +						u32 type, u32 sequence)
> +{
> +	struct v4l2_m2m_buffer *buf = NULL;
> +	struct vb2_v4l2_buffer *vbuf = NULL;
> +
> +	if (V4L2_TYPE_IS_OUTPUT(type)) {
> +		v4l2_m2m_for_each_src_buf(inst->m2m_ctx, buf) {
> +			vbuf = &buf->vb;
> +			if (vbuf->sequence == sequence)
> +				break;
> +			vbuf = NULL;
> +		}
> +	} else {
> +		v4l2_m2m_for_each_dst_buf(inst->m2m_ctx, buf) {
> +			vbuf = &buf->vb;
> +			if (vbuf->sequence == sequence)
> +				break;
> +			vbuf = NULL;
> +		}
> +	}
> +
> +	return vbuf;
> +}
> +
> +struct vb2_v4l2_buffer *vpu_find_buf_by_idx(struct vpu_inst *inst,
> +						u32 type, u32 idx)
> +{
> +	struct v4l2_m2m_buffer *buf = NULL;
> +	struct vb2_v4l2_buffer *vbuf = NULL;
> +
> +	if (V4L2_TYPE_IS_OUTPUT(type)) {
> +		v4l2_m2m_for_each_src_buf(inst->m2m_ctx, buf) {
> +			vbuf = &buf->vb;
> +			if (vbuf->vb2_buf.index == idx)
> +				break;
> +			vbuf = NULL;
> +		}
> +	} else {
> +		v4l2_m2m_for_each_dst_buf(inst->m2m_ctx, buf) {
> +			vbuf = &buf->vb;
> +			if (vbuf->vb2_buf.index == idx)
> +				break;
> +			vbuf = NULL;
> +		}
> +	}
> +
> +	return vbuf;
> +}
> +
> +int vpu_get_num_buffers(struct vpu_inst *inst, u32 type)
> +{
> +	struct vb2_queue *q;
> +
> +	if (!inst || !inst->m2m_ctx)
> +		return -EINVAL;
> +	if (V4L2_TYPE_IS_OUTPUT(type))
> +		q = v4l2_m2m_get_src_vq(inst->m2m_ctx);
> +	else
> +		q = v4l2_m2m_get_dst_vq(inst->m2m_ctx);
> +
> +	return q->num_buffers;
> +}
> +
> +static void vpu_m2m_device_run(void *priv)
> +{
> +}
> +
> +static void vpu_m2m_job_abort(void *priv)
> +{
> +	struct vpu_inst *inst = priv;
> +
> +	v4l2_m2m_job_finish(inst->m2m_dev, inst->m2m_ctx);
> +}
> +
> +static const struct v4l2_m2m_ops vpu_m2m_ops = {
> +	.device_run = vpu_m2m_device_run,
> +	.job_abort = vpu_m2m_job_abort
> +};
> +
> +static int vpu_vb2_queue_setup(struct vb2_queue *vq,
> +				unsigned int *buf_count,
> +				unsigned int *plane_count,
> +				unsigned int psize[],
> +				struct device *allocators[])
> +{
> +	struct vpu_inst *inst = vb2_get_drv_priv(vq);
> +	struct vpu_format *cur_fmt;
> +	int i;
> +
> +	cur_fmt = vpu_get_format(inst, vq->type);
> +
> +	if (*plane_count) {
> +		if (*plane_count != cur_fmt->num_planes)
> +			return -EINVAL;
> +		for (i = 0; i < cur_fmt->num_planes; i++) {
> +			if (psize[i] < cur_fmt->sizeimage[i])
> +				return -EINVAL;
> +		}
> +	}
> +
> +	*plane_count = cur_fmt->num_planes;
> +	for (i = 0; i < cur_fmt->num_planes; i++)
> +		psize[i] = cur_fmt->sizeimage[i];
> +
> +	inst_dbg(inst, LVL_FLOW, "%s queue setup : %u; %u, %u\n",
> +			vpu_type_name(vq->type),
> +			*buf_count,
> +			psize[0], psize[1]);
> +
> +	return 0;
> +}
> +
> +static int vpu_vb2_buf_init(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct vpu_vb2_buffer *vpu_buf = to_vpu_vb2_buffer(vbuf);
> +
> +	vpu_buf->state = VPU_BUF_STATE_IDLE;
> +
> +	return 0;
> +}
> +
> +static void vpu_vb2_buf_cleanup(struct vb2_buffer *vb)
> +{
> +}
> +
> +static int vpu_vb2_buf_prepare(struct vb2_buffer *vb)
> +{
> +	struct vpu_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct vpu_vb2_buffer *vpu_buf = to_vpu_vb2_buffer(vbuf);
> +	struct vpu_format *cur_fmt;
> +	u32 i;
> +
> +	cur_fmt = vpu_get_format(inst, vb->type);
> +	if (vb->num_planes != cur_fmt->num_planes)
> +		return -EINVAL;
> +	for (i = 0; i < cur_fmt->num_planes; i++) {
> +		if (vpu_get_vb_length(vb, i) < cur_fmt->sizeimage[i]) {
> +			inst_err(inst, "%s buf[%d] is invalid\n",
> +					vpu_type_name(vb->type),
> +					vb->index);
> +			vpu_buf->state = VPU_BUF_STATE_ERROR;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void vpu_vb2_buf_finish(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct vpu_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
> +	struct vb2_queue *q = vb->vb2_queue;
> +
> +	if (vbuf->flags & V4L2_BUF_FLAG_LAST)
> +		vpu_notify_eos(inst);
> +
> +	if (list_empty(&q->done_list))
> +		call_vop(inst, on_queue_empty, q->type);
> +}
> +
> +void vpu_vb2_buffers_return(struct vpu_inst *inst,
> +		unsigned int type, enum vb2_buffer_state state)
> +{
> +	struct vb2_v4l2_buffer *buf;
> +
> +	if (!inst || !inst->m2m_ctx)
> +		return;
> +
> +	if (V4L2_TYPE_IS_OUTPUT(type)) {
> +		while ((buf = v4l2_m2m_src_buf_remove(inst->m2m_ctx)))
> +			v4l2_m2m_buf_done(buf, state);
> +	} else {
> +		while ((buf = v4l2_m2m_dst_buf_remove(inst->m2m_ctx)))
> +			v4l2_m2m_buf_done(buf, state);
> +	}
> +}
> +
> +static int vpu_vb2_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> +	struct vpu_inst *inst = vb2_get_drv_priv(q);
> +	int ret;
> +
> +	vpu_inst_unlock(inst);
> +	ret = vpu_inst_register(inst);
> +	vpu_inst_lock(inst);
> +	if (ret)
> +		return ret;
> +
> +	vpu_inst_get(inst);
> +	inst_dbg(inst, LVL_FLOW, "%s start streaming : %d\n",
> +			vpu_type_name(q->type), q->num_buffers);
> +	call_vop(inst, start, q->type);
> +	vb2_clear_last_buffer_dequeued(q);
> +
> +	return 0;
> +}
> +
> +static void vpu_vb2_stop_streaming(struct vb2_queue *q)
> +{
> +	struct vpu_inst *inst = vb2_get_drv_priv(q);
> +
> +	inst_dbg(inst, LVL_FLOW, "%s stop streaming\n", vpu_type_name(q->type));
> +
> +	call_vop(inst, stop, q->type);
> +	vpu_vb2_buffers_return(inst, q->type, VB2_BUF_STATE_ERROR);
> +	if (V4L2_TYPE_IS_OUTPUT(q->type))
> +		inst->sequence = 0;
> +
> +	vpu_inst_put(inst);
> +}
> +
> +static void vpu_vb2_buf_queue(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct vpu_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
> +
> +	inst_dbg(inst, LVL_DEBUG, "%s buf queue\n", vpu_type_name(vb->type));
> +
> +	if (V4L2_TYPE_IS_OUTPUT(vb->type)) {
> +		vbuf->sequence = inst->sequence++;
> +		if ((s64)vb->timestamp < 0)
> +			vb->timestamp = VPU_INVALID_TIMESTAMP;
> +	}
> +
> +	v4l2_m2m_buf_queue(inst->m2m_ctx, vbuf);
> +	vpu_process_output_buffer(inst);
> +	vpu_process_capture_buffer(inst);
> +}
> +
> +static struct vb2_ops vpu_vb2_ops = {
> +	.queue_setup        = vpu_vb2_queue_setup,
> +	.buf_init           = vpu_vb2_buf_init,
> +	.buf_cleanup        = vpu_vb2_buf_cleanup,
> +	.buf_prepare        = vpu_vb2_buf_prepare,
> +	.buf_finish         = vpu_vb2_buf_finish,
> +	.start_streaming    = vpu_vb2_start_streaming,
> +	.stop_streaming     = vpu_vb2_stop_streaming,
> +	.buf_queue          = vpu_vb2_buf_queue,
> +	.wait_prepare       = vb2_ops_wait_prepare,
> +	.wait_finish        = vb2_ops_wait_finish,
> +};
> +
> +static int vpu_m2m_queue_init(void *priv, struct vb2_queue *src_vq,
> +			  struct vb2_queue *dst_vq)
> +{
> +	struct vpu_inst *inst = priv;
> +	int ret;
> +
> +	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +	src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
> +	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	src_vq->ops = &vpu_vb2_ops;
> +	src_vq->mem_ops = &vb2_dma_contig_memops;
> +	if (inst->type == VPU_CORE_TYPE_DEC && inst->use_stream_buffer)
> +		src_vq->mem_ops = &vb2_vmalloc_memops;
> +	src_vq->drv_priv = inst;
> +	src_vq->buf_struct_size = sizeof(struct vpu_vb2_buffer);
> +	src_vq->allow_zero_bytesused = 1;
> +	src_vq->min_buffers_needed = 1;
> +	src_vq->dev = inst->core->dev;
> +	src_vq->lock = &inst->lock;
> +	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_USERPTR | VB2_DMABUF;
> +	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	dst_vq->ops = &vpu_vb2_ops;
> +	dst_vq->mem_ops = &vb2_dma_contig_memops;
> +	if (inst->type == VPU_CORE_TYPE_ENC && inst->use_stream_buffer)
> +		dst_vq->mem_ops = &vb2_vmalloc_memops;
> +	dst_vq->drv_priv = inst;
> +	dst_vq->buf_struct_size = sizeof(struct vpu_vb2_buffer);
> +	dst_vq->allow_zero_bytesused = 1;
> +	dst_vq->min_buffers_needed = 1;
> +	dst_vq->dev = inst->core->dev;
> +	dst_vq->lock = &inst->lock;
> +	ret = vb2_queue_init(dst_vq);
> +	if (ret) {
> +		vb2_queue_release(src_vq);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vpu_v4l2_release(struct vpu_inst *inst)
> +{
> +	struct vpu_core *core = inst->core;
> +
> +	inst_dbg(inst, LVL_FLOW, "%s\n", __func__);
> +
> +	vpu_release_core(core);
> +
> +	if (inst->workqueue) {
> +		cancel_work_sync(&inst->msg_work);
> +		destroy_workqueue(inst->workqueue);
> +		inst->workqueue = NULL;
> +	}
> +	if (inst->m2m_ctx) {
> +		v4l2_m2m_ctx_release(inst->m2m_ctx);
> +		inst->m2m_ctx = NULL;
> +	}
> +	if (inst->m2m_dev) {
> +		v4l2_m2m_release(inst->m2m_dev);
> +		inst->m2m_dev = NULL;
> +	}
> +
> +	v4l2_ctrl_handler_free(&inst->ctrl_handler);
> +	mutex_destroy(&inst->lock);
> +	v4l2_fh_del(&inst->fh);
> +	v4l2_fh_exit(&inst->fh);
> +
> +	call_vop(inst, cleanup);
> +
> +	return 0;
> +}
> +
> +int vpu_v4l2_open(struct file *file, struct vpu_inst *inst)
> +{
> +	struct vpu_dev *vpu = video_drvdata(file);
> +	struct video_device *vdev;
> +	struct vpu_core *core = NULL;
> +	int ret = 0;
> +
> +	WARN_ON(!file || !inst || !inst->ops);
> +
> +	if (inst->type == VPU_CORE_TYPE_ENC)
> +		vdev = vpu->vdev_enc;
> +	else
> +		vdev = vpu->vdev_dec;
> +
> +	mutex_init(&inst->lock);
> +	INIT_LIST_HEAD(&inst->cmd_q);
> +
> +	inst->id = VPU_INST_NULL_ID;
> +	inst->release = vpu_v4l2_release;
> +	inst->core = vpu_request_core(vpu, inst->type);
> +	inst->pid = current->pid;
> +	inst->tgid = current->tgid;
> +
> +	core = inst->core;
> +	if (!core) {
> +		vpu_err("there is no core for %s\n",
> +			vpu_core_type_desc(inst->type));
> +		return -EINVAL;
> +	}
> +
> +	inst->min_buffer_cap = 2;
> +	inst->min_buffer_out = 2;
> +
> +	ret = call_vop(inst, ctrl_init);
> +	if (ret)
> +		goto error;
> +
> +	inst->m2m_dev = v4l2_m2m_init(&vpu_m2m_ops);
> +	if (IS_ERR(inst->m2m_dev)) {
> +		vpu_err("v4l2_m2m_init fail\n");
> +		ret = PTR_ERR(inst->m2m_dev);
> +		goto error;
> +	}
> +
> +	inst->m2m_ctx = v4l2_m2m_ctx_init(inst->m2m_dev,
> +					inst, vpu_m2m_queue_init);
> +	if (IS_ERR(inst->m2m_ctx)) {
> +		vpu_err("v4l2_m2m_ctx_init fail\n");
> +		ret = PTR_ERR(inst->m2m_dev);
> +		goto error;
> +	}
> +
> +	v4l2_fh_init(&inst->fh, vdev);
> +	v4l2_fh_add(&inst->fh);
> +	inst->fh.ctrl_handler = &inst->ctrl_handler;
> +	inst->fh.m2m_ctx = inst->m2m_ctx;
> +	file->private_data = &inst->fh;
> +	inst->state = VPU_CODEC_STATE_DEINIT;
> +	inst->workqueue = alloc_workqueue("vpu_inst", WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
> +	if (inst->workqueue) {
> +		INIT_WORK(&inst->msg_work, vpu_inst_run_work);
> +		ret = kfifo_init(&inst->msg_fifo,
> +				inst->msg_buffer,
> +				roundup_pow_of_two(sizeof(inst->msg_buffer)));
> +		if (ret) {
> +			destroy_workqueue(inst->workqueue);
> +			inst->workqueue = NULL;
> +		}
> +	}
> +	atomic_set(&inst->ref_count, 0);
> +	vpu_inst_get(inst);
> +	vpu_dbg(LVL_FLOW, "open, tgid = %d, pid = %d\n", inst->tgid, inst->pid);
> +
> +	return 0;
> +error:
> +	if (inst->m2m_ctx) {
> +		v4l2_m2m_ctx_release(inst->m2m_ctx);
> +		inst->m2m_ctx = NULL;
> +	}
> +	if (inst->m2m_dev) {
> +		v4l2_m2m_release(inst->m2m_dev);
> +		inst->m2m_dev = NULL;
> +	}
> +	v4l2_ctrl_handler_free(&inst->ctrl_handler);
> +	vpu_release_core(inst->core);
> +
> +	return ret;
> +}
> +
> +int vpu_v4l2_close(struct file *file)
> +{
> +	struct vpu_inst *inst = to_inst(file);
> +	struct vb2_queue *src_q;
> +	struct vb2_queue *dst_q;
> +
> +	inst_dbg(inst, LVL_FLOW, "close\n");
> +	src_q = v4l2_m2m_get_src_vq(inst->m2m_ctx);
> +	dst_q = v4l2_m2m_get_dst_vq(inst->m2m_ctx);
> +	vpu_inst_lock(inst);
> +	if (vb2_is_streaming(src_q))
> +		v4l2_m2m_streamoff(file, inst->m2m_ctx, src_q->type);
> +	if (vb2_is_streaming(dst_q))
> +		v4l2_m2m_streamoff(file, inst->m2m_ctx, dst_q->type);
> +	vpu_inst_unlock(inst);
> +
> +	call_vop(inst, release);
> +	vpu_inst_unregister(inst);
> +	vpu_inst_put(inst);
> +
> +	return 0;
> +}
> diff --git a/drivers/media/platform/amphion/vpu_v4l2.h b/drivers/media/platform/amphion/vpu_v4l2.h
> new file mode 100644
> index 000000000000..8873e1f66072
> --- /dev/null
> +++ b/drivers/media/platform/amphion/vpu_v4l2.h
> @@ -0,0 +1,53 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2020-2021 NXP
> + */
> +
> +#ifndef _AMPHION_VPU_V4L2_H
> +#define _AMPHION_VPU_V4L2_H
> +
> +#include <linux/videodev2.h>
> +
> +void vpu_inst_lock(struct vpu_inst *inst);
> +void vpu_inst_unlock(struct vpu_inst *inst);
> +
> +int vpu_v4l2_open(struct file *file, struct vpu_inst *inst);
> +int vpu_v4l2_close(struct file *file);
> +
> +const struct vpu_format *vpu_try_fmt_common(struct vpu_inst *inst, struct v4l2_format *f);
> +int vpu_process_output_buffer(struct vpu_inst *inst);
> +int vpu_process_capture_buffer(struct vpu_inst *inst);
> +struct vb2_v4l2_buffer *vpu_find_buf_by_sequence(struct vpu_inst *inst, u32 type, u32 sequence);
> +struct vb2_v4l2_buffer *vpu_find_buf_by_idx(struct vpu_inst *inst, u32 type, u32 idx);
> +void vpu_v4l2_set_error(struct vpu_inst *inst);
> +int vpu_notify_eos(struct vpu_inst *inst);
> +int vpu_notify_source_change(struct vpu_inst *inst);
> +void vpu_vb2_buffers_return(struct vpu_inst *inst,
> +		unsigned int type, enum vb2_buffer_state state);
> +int vpu_get_num_buffers(struct vpu_inst *inst, u32 type);
> +
> +dma_addr_t vpu_get_vb_phy_addr(struct vb2_buffer *vb, u32 plane_no);
> +unsigned int vpu_get_vb_length(struct vb2_buffer *vb, u32 plane_no);
> +static inline struct vpu_format *vpu_get_format(struct vpu_inst *inst, u32 type)
> +{
> +	if (V4L2_TYPE_IS_OUTPUT(type))
> +		return &inst->out_format;
> +	else
> +		return &inst->cap_format;
> +}
> +
> +static inline char *vpu_type_name(u32 type)
> +{
> +	return V4L2_TYPE_IS_OUTPUT(type) ? "output" : "capture";
> +}
> +
> +static inline int vpu_vb_is_codecconfig(struct vb2_v4l2_buffer *vbuf)
> +{
> +#ifdef V4L2_BUF_FLAG_CODECCONFIG
> +	return (vbuf->flags & V4L2_BUF_FLAG_CODECCONFIG) ? 1 : 0;
> +#else
> +	return 0;
> +#endif
> +}
> +
> +#endif