[v7,13/15] media: mtk-vcodec: support stateless H.264 decoding for mt8192

Adds h264 lat and core architecture driver for mt8192,
and the decode mode is frame based for stateless decoder.

Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
---
 drivers/media/platform/mtk-vcodec/Makefile    |   1 +
 .../mtk-vcodec/vdec/vdec_h264_req_multi_if.c  | 621 ++++++++++++++++++
 .../media/platform/mtk-vcodec/vdec_drv_if.c   |   8 +-
 .../media/platform/mtk-vcodec/vdec_drv_if.h   |   1 +
 include/linux/remoteproc/mtk_scp.h            |   2 +
 5 files changed, 632 insertions(+), 1 deletion(-)
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_multi_if.c

Le mercredi 23 février 2022 à 11:40 +0800, Yunfei Dong a écrit :
> Adds h264 lat and core architecture driver for mt8192,
> and the decode mode is frame based for stateless decoder.
> 
> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> ---
>  drivers/media/platform/mtk-vcodec/Makefile    |   1 +
>  .../mtk-vcodec/vdec/vdec_h264_req_multi_if.c  | 621 ++++++++++++++++++
>  .../media/platform/mtk-vcodec/vdec_drv_if.c   |   8 +-
>  .../media/platform/mtk-vcodec/vdec_drv_if.h   |   1 +
>  include/linux/remoteproc/mtk_scp.h            |   2 +
>  5 files changed, 632 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_multi_if.c
> 
> diff --git a/drivers/media/platform/mtk-vcodec/Makefile b/drivers/media/platform/mtk-vcodec/Makefile
> index 3f41d748eee5..22edb1c86598 100644
> --- a/drivers/media/platform/mtk-vcodec/Makefile
> +++ b/drivers/media/platform/mtk-vcodec/Makefile
> @@ -10,6 +10,7 @@ mtk-vcodec-dec-y := vdec/vdec_h264_if.o \
>  		vdec/vdec_vp9_if.o \
>  		vdec/vdec_h264_req_if.o \
>  		vdec/vdec_h264_req_common.o \
> +		vdec/vdec_h264_req_multi_if.o \
>  		mtk_vcodec_dec_drv.o \
>  		vdec_drv_if.o \
>  		vdec_vpu_if.o \
> diff --git a/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_multi_if.c b/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_multi_if.c
> new file mode 100644
> index 000000000000..82a279f327c4
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_multi_if.c
> @@ -0,0 +1,621 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2021 MediaTek Inc.
> + * Author: Yunfei Dong <yunfei.dong@mediatek.com>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <media/v4l2-h264.h>
> +#include <media/v4l2-mem2mem.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "../mtk_vcodec_util.h"
> +#include "../mtk_vcodec_dec.h"
> +#include "../mtk_vcodec_intr.h"
> +#include "../vdec_drv_base.h"
> +#include "../vdec_drv_if.h"
> +#include "../vdec_vpu_if.h"
> +#include "vdec_h264_req_common.h"
> +
> +/**
> + * enum vdec_h264_core_dec_err_type  - core decode error type

Similar to my comment on other patch, I notice that a empty line is added here
in other doc comments. To be applied everywhere of course.

> + * @TRANS_BUFFER_FULL : trans buffer is full
> + * @SLICE_HEADER_FULL : slice header buffer is full
> + */
> +enum vdec_h264_core_dec_err_type {
> +	TRANS_BUFFER_FULL = 1,
> +	SLICE_HEADER_FULL,
> +};
> +
> +/**
> + * struct vdec_h264_slice_lat_dec_param  - parameters for decode current frame
> + * @sps : h264 sps syntax parameters
> + * @pps : h264 pps syntax parameters
> + * @slice_header: h264 slice header syntax parameters
> + * @scaling_matrix : h264 scaling list parameters
> + * @decode_params : decoder parameters of each frame used for hardware decode
> + * @h264_dpb_info : dpb reference list
> + */
> +struct vdec_h264_slice_lat_dec_param {
> +	struct mtk_h264_sps_param sps;
> +	struct mtk_h264_pps_param pps;
> +	struct mtk_h264_slice_hd_param slice_header;
> +	struct slice_api_h264_scaling_matrix scaling_matrix;
> +	struct slice_api_h264_decode_param decode_params;
> +	struct mtk_h264_dpb_info h264_dpb_info[V4L2_H264_NUM_DPB_ENTRIES];
> +};
> +
> +/**
> + * struct vdec_h264_slice_info - decode information
> + * @nal_info    : nal info of current picture
> + * @timeout     : Decode timeout: 1 timeout, 0 no timeount
> + * @bs_buf_size : bitstream size
> + * @bs_buf_addr : bitstream buffer dma address
> + * @y_fb_dma    : Y frame buffer dma address
> + * @c_fb_dma    : C frame buffer dma address
> + * @vdec_fb_va  : VDEC frame buffer struct virtual address
> + * @crc         : Used to check whether hardware's status is right
> + */
> +struct vdec_h264_slice_info {
> +	u16 nal_info;
> +	u16 timeout;
> +	u32 bs_buf_size;
> +	u64 bs_buf_addr;
> +	u64 y_fb_dma;
> +	u64 c_fb_dma;
> +	u64 vdec_fb_va;
> +	u32 crc[8];
> +};
> +
> +/**
> + * struct vdec_h264_slice_vsi - shared memory for decode information exchange
> + *        between VPU and Host. The memory is allocated by VPU then mapping to
> + *        Host in vdec_h264_slice_init() and freed in vdec_h264_slice_deinit()
> + *        by VPU. AP-W/R : AP is writer/reader on this item. VPU-W/R: VPU is
> + *        write/reader on this item.

Long description goes below the member list.

> + * @wdma_err_addr       : wdma error dma address
> + * @wdma_start_addr     : wdma start dma address
> + * @wdma_end_addr       : wdma end dma address
> + * @slice_bc_start_addr : slice bc start dma address
> + * @slice_bc_end_addr   : slice bc end dma address
> + * @row_info_start_addr : row info start dma address
> + * @row_info_end_addr   : row info end dma address
> + * @trans_start         : trans start dma address
> + * @trans_end           : trans end dma address
> + * @wdma_end_addr_offset: wdma end address offset
> + *
> + * @mv_buf_dma          : HW working motion vector buffer
> + *                        dma address (AP-W, VPU-R)
> + * @dec                 : decode information (AP-R, VPU-W)
> + * @h264_slice_params   : decode parameters for hw used

Please use consistent style, in general : has no space in other doc comment I
see. Please apply across the code.

> + */
> +struct vdec_h264_slice_vsi {
> +	/* LAT dec addr */
> +	u64 wdma_err_addr;
> +	u64 wdma_start_addr;
> +	u64 wdma_end_addr;
> +	u64 slice_bc_start_addr;
> +	u64 slice_bc_end_addr;
> +	u64 row_info_start_addr;
> +	u64 row_info_end_addr;
> +	u64 trans_start;
> +	u64 trans_end;
> +	u64 wdma_end_addr_offset;
> +
> +	u64 mv_buf_dma[H264_MAX_MV_NUM];
> +	struct vdec_h264_slice_info dec;
> +	struct vdec_h264_slice_lat_dec_param h264_slice_params;
> +};
> +
> +/**
> + * struct vdec_h264_slice_share_info - shared information used to exchange
> + *                                     message between lat and core
> + * @sps	              : sequence header information from user space
> + * @dec_params        : decoder params from user space
> + * @h264_slice_params : decoder params used for hardware
> + * @trans_start       : trans start dma address
> + * @trans_end         : trans end dma address
> + * @nal_info          : nal info of current picture
> + */
> +struct vdec_h264_slice_share_info {
> +	struct v4l2_ctrl_h264_sps sps;
> +	struct v4l2_ctrl_h264_decode_params dec_params;
> +	struct vdec_h264_slice_lat_dec_param h264_slice_params;
> +	u64 trans_start;
> +	u64 trans_end;
> +	u16 nal_info;
> +};
> +
> +/**
> + * struct vdec_h264_slice_inst - h264 decoder instance
> + * @slice_dec_num        : how many picture be decoded
> + * @ctx                 : point to mtk_vcodec_ctx
> + * @pred_buf            : HW working predication buffer
> + * @mv_buf              : HW working motion vector buffer
> + * @vpu                 : VPU instance
> + * @vsi                 : vsi used for lat
> + * @vsi_core            : vsi used for core
> + *
> + * @resolution_changed  : resolution changed
> + * @realloc_mv_buf      : reallocate mv buffer
> + * @cap_num_planes      : number of capture queue plane
> + *
> + * @dpb : decoded picture buffer used to store reference buffer information
> + */
> +struct vdec_h264_slice_inst {
> +	unsigned int slice_dec_num;
> +	struct mtk_vcodec_ctx *ctx;
> +	struct mtk_vcodec_mem pred_buf;
> +	struct mtk_vcodec_mem mv_buf[H264_MAX_MV_NUM];
> +	struct vdec_vpu_inst vpu;
> +	struct vdec_h264_slice_vsi *vsi;
> +	struct vdec_h264_slice_vsi *vsi_core;
> +
> +	unsigned int resolution_changed;
> +	unsigned int realloc_mv_buf;
> +	unsigned int cap_num_planes;
> +
> +	struct v4l2_h264_dpb_entry dpb[16];
> +};
> +
> +static int vdec_h264_slice_fill_decode_parameters(struct vdec_h264_slice_inst *inst,
> +						  struct vdec_h264_slice_share_info *share_info)
> +{
> +	struct vdec_h264_slice_lat_dec_param *slice_param = &inst->vsi->h264_slice_params;
> +	const struct v4l2_ctrl_h264_decode_params *dec_params;
> +	const struct v4l2_ctrl_h264_scaling_matrix *src_matrix;
> +	const struct v4l2_ctrl_h264_sps *sps;
> +	const struct v4l2_ctrl_h264_pps *pps;
> +
> +	dec_params =
> +		mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_DECODE_PARAMS);
> +	if (IS_ERR(dec_params))
> +		return PTR_ERR(dec_params);
> +
> +	src_matrix =
> +		mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_SCALING_MATRIX);
> +	if (IS_ERR(src_matrix))
> +		return PTR_ERR(src_matrix);
> +
> +	sps = mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_SPS);
> +	if (IS_ERR(sps))
> +		return PTR_ERR(sps);
> +
> +	pps = mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_PPS);
> +	if (IS_ERR(pps))
> +		return PTR_ERR(pps);
> +
> +	if (dec_params->flags & V4L2_H264_DECODE_PARAM_FLAG_FIELD_PIC) {
> +		mtk_vcodec_err(inst, "h264 no support field bitstream.");
Perhaps rephrase to:

"No support for H.264 field decoding."

> +		return -EINVAL;
> +	}
> +
> +	mtk_vdec_h264_copy_sps_params(&slice_param->sps, sps);
> +	mtk_vdec_h264_copy_pps_params(&slice_param->pps, pps);
> +	mtk_vdec_h264_copy_scaling_matrix(&slice_param->scaling_matrix, src_matrix);
> +
> +	memcpy(&share_info->sps, sps, sizeof(*sps));
> +	memcpy(&share_info->dec_params, dec_params, sizeof(*dec_params));
> +
> +	return 0;
> +}
> +
> +static void vdec_h264_slice_fill_decode_reflist(struct vdec_h264_slice_inst *inst,
> +						struct vdec_h264_slice_lat_dec_param *slice_param,
> +						struct vdec_h264_slice_share_info *share_info)
> +{
> +	struct v4l2_ctrl_h264_decode_params *dec_params = &share_info->dec_params;
> +	struct v4l2_ctrl_h264_sps *sps = &share_info->sps;
> +	struct v4l2_h264_reflist_builder reflist_builder;
> +	u8 *p0_reflist = slice_param->decode_params.ref_pic_list_p0;
> +	u8 *b0_reflist = slice_param->decode_params.ref_pic_list_b0;
> +	u8 *b1_reflist = slice_param->decode_params.ref_pic_list_b1;
> +
> +	mtk_vdec_h264_update_dpb(dec_params, inst->dpb);
> +
> +	mtk_vdec_h264_copy_decode_params(&slice_param->decode_params, dec_params,
> +					 inst->dpb);
> +	mtk_vdec_h264_fill_dpb_info(inst->ctx, &slice_param->decode_params,
> +				    slice_param->h264_dpb_info);
> +
> +	mtk_v4l2_debug(3, "cur poc = %d\n", dec_params->bottom_field_order_cnt);
> +	/* Build the reference lists */
> +	v4l2_h264_init_reflist_builder(&reflist_builder, dec_params, sps,
> +				       inst->dpb);
> +	v4l2_h264_build_p_ref_list(&reflist_builder, p0_reflist);
> +	v4l2_h264_build_b_ref_lists(&reflist_builder, b0_reflist, b1_reflist);
> +
> +	/* Adapt the built lists to the firmware's expectations */
> +	mtk_vdec_h264_fixup_ref_list(p0_reflist, reflist_builder.num_valid);
> +	mtk_vdec_h264_fixup_ref_list(b0_reflist, reflist_builder.num_valid);
> +	mtk_vdec_h264_fixup_ref_list(b1_reflist, reflist_builder.num_valid);
> +}
> +
> +static int vdec_h264_slice_alloc_mv_buf(struct vdec_h264_slice_inst *inst,
> +					struct vdec_pic_info *pic)
> +{
> +	unsigned int buf_sz = mtk_vdec_h264_get_mv_buf_size(pic->buf_w, pic->buf_h);
> +	struct mtk_vcodec_mem *mem;
> +	int i, err;
> +
> +	mtk_v4l2_debug(3, "size = 0x%x", buf_sz);
> +	for (i = 0; i < H264_MAX_MV_NUM; i++) {
> +		mem = &inst->mv_buf[i];

nit: Perhaps you could skip (or clear) if mem->size == buf_sz ?

> +		if (mem->va)
> +			mtk_vcodec_mem_free(inst->ctx, mem);
> +		mem->size = buf_sz;
> +		err = mtk_vcodec_mem_alloc(inst->ctx, mem);
> +		if (err) {
> +			mtk_vcodec_err(inst, "failed to allocate mv buf");
> +			return err;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void vdec_h264_slice_free_mv_buf(struct vdec_h264_slice_inst *inst)
> +{
> +	int i;
> +	struct mtk_vcodec_mem *mem;
> +
> +	for (i = 0; i < H264_MAX_MV_NUM; i++) {
> +		mem = &inst->mv_buf[i];
> +		if (mem->va)
> +			mtk_vcodec_mem_free(inst->ctx, mem);
> +	}
> +}
> +
> +static void vdec_h264_slice_get_pic_info(struct vdec_h264_slice_inst *inst)
> +{
> +	struct mtk_vcodec_ctx *ctx = inst->ctx;
> +	unsigned int data[3];

nit: use u32 for clarity ?

> +
> +	data[0] = ctx->picinfo.pic_w;
> +	data[1] = ctx->picinfo.pic_h;
> +	data[2] = ctx->capture_fourcc;
> +	vpu_dec_get_param(&inst->vpu, data, 3, GET_PARAM_PIC_INFO);
> +
> +	ctx->picinfo.buf_w = ALIGN(ctx->picinfo.pic_w, 64);
> +	ctx->picinfo.buf_h = ALIGN(ctx->picinfo.pic_h, 64);

I notice that this is hard coded alignment in many places, should at least have
a constant somewhere.

> +	ctx->picinfo.fb_sz[0] = inst->vpu.fb_sz[0];
> +	ctx->picinfo.fb_sz[1] = inst->vpu.fb_sz[1];
> +	inst->cap_num_planes =
> +		ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes;
> +
> +	mtk_vcodec_debug(inst, "pic(%d, %d), buf(%d, %d)",
> +			 ctx->picinfo.pic_w, ctx->picinfo.pic_h,
> +			 ctx->picinfo.buf_w, ctx->picinfo.buf_h);
> +	mtk_vcodec_debug(inst, "Y/C(%d, %d)", ctx->picinfo.fb_sz[0],
> +			 ctx->picinfo.fb_sz[1]);
> +
> +	if (ctx->last_decoded_picinfo.pic_w != ctx->picinfo.pic_w ||
> +	    ctx->last_decoded_picinfo.pic_h != ctx->picinfo.pic_h) {
> +		inst->resolution_changed = true;
> +		if (ctx->last_decoded_picinfo.buf_w != ctx->picinfo.buf_w ||
> +		    ctx->last_decoded_picinfo.buf_h != ctx->picinfo.buf_h)
> +			inst->realloc_mv_buf = true;
> +
> +		mtk_v4l2_debug(1, "resChg: (%d %d) : old(%d, %d) -> new(%d, %d)",
> +			       inst->resolution_changed,
> +			       inst->realloc_mv_buf,
> +			       ctx->last_decoded_picinfo.pic_w,
> +			       ctx->last_decoded_picinfo.pic_h,
> +			       ctx->picinfo.pic_w, ctx->picinfo.pic_h);
> +	}
> +}
> +
> +static void vdec_h264_slice_get_crop_info(struct vdec_h264_slice_inst *inst,
> +					  struct v4l2_rect *cr)
> +{
> +	cr->left = 0;
> +	cr->top = 0;
> +	cr->width = inst->ctx->picinfo.pic_w;
> +	cr->height = inst->ctx->picinfo.pic_h;
> +
> +	mtk_vcodec_debug(inst, "l=%d, t=%d, w=%d, h=%d",
> +			 cr->left, cr->top, cr->width, cr->height);
> +}
> +
> +static int vdec_h264_slice_init(struct mtk_vcodec_ctx *ctx)
> +{
> +	struct vdec_h264_slice_inst *inst;
> +	int err, vsi_size;
> +
> +	inst = kzalloc(sizeof(*inst), GFP_KERNEL);
> +	if (!inst)
> +		return -ENOMEM;
> +
> +	inst->ctx = ctx;
> +
> +	inst->vpu.id = SCP_IPI_VDEC_LAT;
> +	inst->vpu.core_id = SCP_IPI_VDEC_CORE;
> +	inst->vpu.ctx = ctx;
> +	inst->vpu.codec_type = ctx->current_codec;
> +	inst->vpu.capture_type = ctx->capture_fourcc;
> +
> +	err = vpu_dec_init(&inst->vpu);
> +	if (err) {
> +		mtk_vcodec_err(inst, "vdec_h264 init err=%d", err);
> +		goto error_free_inst;
> +	}
> +
> +	vsi_size = round_up(sizeof(struct vdec_h264_slice_vsi), 64);
> +	inst->vsi = inst->vpu.vsi;
> +	inst->vsi_core =
> +		(struct vdec_h264_slice_vsi *)(((char *)inst->vpu.vsi) + vsi_size);
> +	inst->resolution_changed = true;
> +	inst->realloc_mv_buf = true;
> +
> +	mtk_vcodec_debug(inst, "lat struct size = %d,%d,%d,%d vsi: %d\n",
> +			 (int)sizeof(struct mtk_h264_sps_param),
> +			 (int)sizeof(struct mtk_h264_pps_param),
> +			 (int)sizeof(struct vdec_h264_slice_lat_dec_param),
> +			 (int)sizeof(struct mtk_h264_dpb_info),
> +			 vsi_size);
> +	mtk_vcodec_debug(inst, "lat H264 instance >> %p, codec_type = 0x%x",
> +			 inst, inst->vpu.codec_type);
> +
> +	ctx->drv_handle = inst;
> +	return 0;
> +
> +error_free_inst:
> +	kfree(inst);
> +	return err;
> +}
> +
> +static void vdec_h264_slice_deinit(void *h_vdec)
> +{
> +	struct vdec_h264_slice_inst *inst = h_vdec;
> +
> +	mtk_vcodec_debug_enter(inst);
> +
> +	vpu_dec_deinit(&inst->vpu);
> +	vdec_h264_slice_free_mv_buf(inst);
> +	vdec_msg_queue_deinit(&inst->ctx->msg_queue, inst->ctx);
> +
> +	kfree(inst);
> +}
> +
> +static int vdec_h264_slice_core_decode(struct vdec_lat_buf *lat_buf)
> +{
> +	struct vdec_fb *fb;
> +	u64 vdec_fb_va;
> +	u64 y_fb_dma, c_fb_dma;
> +	int err, timeout, i;
> +	struct mtk_vcodec_ctx *ctx = lat_buf->ctx;
> +	struct vdec_h264_slice_inst *inst = ctx->drv_handle;
> +	struct vb2_v4l2_buffer *vb2_v4l2;
> +	struct vdec_h264_slice_share_info *share_info = lat_buf->private_data;
> +	struct mtk_vcodec_mem *mem;
> +	struct vdec_vpu_inst *vpu = &inst->vpu;
> +
> +	mtk_vcodec_debug(inst, "[h264-core] vdec_h264 core decode");
> +	memcpy_toio(&inst->vsi_core->h264_slice_params, &share_info->h264_slice_params,
> +		    sizeof(share_info->h264_slice_params));
> +
> +	fb = ctx->dev->vdec_pdata->get_cap_buffer(ctx);
> +	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
> +	vdec_fb_va = (unsigned long)fb;
> +
> +	if (ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes == 1)
> +		c_fb_dma =
> +			y_fb_dma + inst->ctx->picinfo.buf_w * inst->ctx->picinfo.buf_h;

Should use the stride (bytesperline) instead, this will allow un-hardcoding the
width alignment. And normally, the alignnement should also be found/set in the
fmt, so you could maybe use that only ?

Though, I'm not sure I understand why single plane is supported here. MM21 seems
to be defined with 2 planes and there is no other formats.


> +	else
> +		c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;
> +
> +	mtk_vcodec_debug(inst, "[h264-core] y/c addr = 0x%llx 0x%llx", y_fb_dma,
> +			 c_fb_dma);
> +
> +	inst->vsi_core->dec.y_fb_dma = y_fb_dma;
> +	inst->vsi_core->dec.c_fb_dma = c_fb_dma;
> +	inst->vsi_core->dec.vdec_fb_va = vdec_fb_va;
> +	inst->vsi_core->dec.nal_info = share_info->nal_info;
> +	inst->vsi_core->wdma_start_addr =
> +		lat_buf->ctx->msg_queue.wdma_addr.dma_addr;
> +	inst->vsi_core->wdma_end_addr =
> +		lat_buf->ctx->msg_queue.wdma_addr.dma_addr +
> +		lat_buf->ctx->msg_queue.wdma_addr.size;
> +	inst->vsi_core->wdma_err_addr = lat_buf->wdma_err_addr.dma_addr;
> +	inst->vsi_core->slice_bc_start_addr = lat_buf->slice_bc_addr.dma_addr;
> +	inst->vsi_core->slice_bc_end_addr = lat_buf->slice_bc_addr.dma_addr +
> +		lat_buf->slice_bc_addr.size;
> +	inst->vsi_core->trans_start = share_info->trans_start;
> +	inst->vsi_core->trans_end = share_info->trans_end;
> +	for (i = 0; i < H264_MAX_MV_NUM; i++) {
> +		mem = &inst->mv_buf[i];
> +		inst->vsi_core->mv_buf_dma[i] = mem->dma_addr;
> +	}
> +
> +	vb2_v4l2 = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
> +	vb2_v4l2->vb2_buf.timestamp = lat_buf->ts_info.vb2_buf.timestamp;
> +	vb2_v4l2->timecode = lat_buf->ts_info.timecode;
> +	vb2_v4l2->field = lat_buf->ts_info.field;
> +	vb2_v4l2->flags = lat_buf->ts_info.flags;

Not quite, not all src buffer flags needs to be copied. Please use
v4l2_m2m_buf_copy_metadata() instead.

> +	vb2_v4l2->vb2_buf.copied_timestamp =
> +		lat_buf->ts_info.vb2_buf.copied_timestamp;
> +
> +	vdec_h264_slice_fill_decode_reflist(inst, &inst->vsi_core->h264_slice_params,
> +					    share_info);
> +
> +	err = vpu_dec_core(vpu);
> +	if (err) {
> +		mtk_vcodec_err(inst, "core decode err=%d", err);
> +		goto vdec_dec_end;
> +	}
> +
> +	/* wait decoder done interrupt */
> +	timeout = mtk_vcodec_wait_for_done_ctx(inst->ctx, MTK_INST_IRQ_RECEIVED,
> +					       WAIT_INTR_TIMEOUT_MS, MTK_VDEC_CORE);
> +	if (timeout)
> +		mtk_vcodec_err(inst, "core decode timeout: pic_%d",
> +			       ctx->decoded_frame_cnt);
> +	inst->vsi_core->dec.timeout = !!timeout;
> +
> +	vpu_dec_core_end(vpu);
> +	mtk_vcodec_debug(inst, "pic[%d] crc: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x",
> +			 ctx->decoded_frame_cnt,
> +			 inst->vsi_core->dec.crc[0], inst->vsi_core->dec.crc[1],
> +			 inst->vsi_core->dec.crc[2], inst->vsi_core->dec.crc[3],
> +			 inst->vsi_core->dec.crc[4], inst->vsi_core->dec.crc[5],
> +			 inst->vsi_core->dec.crc[6], inst->vsi_core->dec.crc[7]);
> +
> +vdec_dec_end:
> +	vdec_msg_queue_update_ube_rptr(&lat_buf->ctx->msg_queue,
> +				       share_info->trans_end);
> +	ctx->dev->vdec_pdata->cap_to_disp(ctx, fb, !!err);
> +	mtk_vcodec_debug(inst, "core decode done err=%d", err);
> +	ctx->decoded_frame_cnt++;
> +	return 0;
> +}
> +
> +static int vdec_h264_slice_decode(void *h_vdec, struct mtk_vcodec_mem *bs,
> +				  struct vdec_fb *fb, bool *res_chg)
> +{
> +	struct vdec_h264_slice_inst *inst = h_vdec;
> +	struct vdec_vpu_inst *vpu = &inst->vpu;
> +	struct mtk_video_dec_buf *src_buf_info;
> +	int nal_start_idx, err, timeout = 0, i;
> +	unsigned int data[2];
> +	struct vdec_lat_buf *lat_buf;
> +	struct vdec_h264_slice_share_info *share_info;
> +	unsigned char *buf;
> +	struct mtk_vcodec_mem *mem;
> +
> +	if (vdec_msg_queue_init(&inst->ctx->msg_queue, inst->ctx,
> +				vdec_h264_slice_core_decode,
> +				sizeof(*share_info)))
> +		return -ENOMEM;
> +
> +	/* bs NULL means flush decoder */
> +	if (!bs) {
> +		vdec_msg_queue_wait_lat_buf_full(&inst->ctx->msg_queue);
> +		return vpu_dec_reset(vpu);
> +	}
> +
> +	lat_buf = vdec_msg_queue_dqbuf(&inst->ctx->msg_queue.lat_ctx);
> +	if (!lat_buf) {
> +		mtk_vcodec_err(inst, "failed to get lat buffer");
> +		return -EINVAL;
> +	}
> +	share_info = lat_buf->private_data;
> +	src_buf_info = container_of(bs, struct mtk_video_dec_buf, bs_buffer);
> +
> +	buf = (unsigned char *)bs->va;
> +	nal_start_idx = mtk_vdec_h264_find_start_code(buf, bs->size);
> +	if (nal_start_idx < 0) {
> +		err = -EINVAL;
> +		goto err_free_fb_out;
> +	}
> +
> +	inst->vsi->dec.nal_info = buf[nal_start_idx];
> +	inst->vsi->dec.bs_buf_addr = (u64)bs->dma_addr;
> +	inst->vsi->dec.bs_buf_size = bs->size;
> +
> +	v4l2_m2m_buf_copy_metadata(&src_buf_info->m2m_buf.vb,
> +				   &lat_buf->ts_info, true);
> +
> +	err = vdec_h264_slice_fill_decode_parameters(inst, share_info);
> +	if (err)
> +		goto err_free_fb_out;
> +
> +	*res_chg = inst->resolution_changed;
> +	if (inst->resolution_changed) {
> +		mtk_vcodec_debug(inst, "- resolution changed -");
> +		if (inst->realloc_mv_buf) {
> +			err = vdec_h264_slice_alloc_mv_buf(inst, &inst->ctx->picinfo);
> +			inst->realloc_mv_buf = false;
> +			if (err)
> +				goto err_free_fb_out;
> +		}
> +		inst->resolution_changed = false;
> +	}
> +	for (i = 0; i < H264_MAX_MV_NUM; i++) {
> +		mem = &inst->mv_buf[i];
> +		inst->vsi->mv_buf_dma[i] = mem->dma_addr;
> +	}
> +	inst->vsi->wdma_start_addr = lat_buf->ctx->msg_queue.wdma_addr.dma_addr;
> +	inst->vsi->wdma_end_addr = lat_buf->ctx->msg_queue.wdma_addr.dma_addr +
> +		lat_buf->ctx->msg_queue.wdma_addr.size;
> +	inst->vsi->wdma_err_addr = lat_buf->wdma_err_addr.dma_addr;
> +	inst->vsi->slice_bc_start_addr = lat_buf->slice_bc_addr.dma_addr;
> +	inst->vsi->slice_bc_end_addr = lat_buf->slice_bc_addr.dma_addr +
> +		lat_buf->slice_bc_addr.size;
> +
> +	inst->vsi->trans_end = inst->ctx->msg_queue.wdma_rptr_addr;
> +	inst->vsi->trans_start = inst->ctx->msg_queue.wdma_wptr_addr;
> +	mtk_vcodec_debug(inst, "lat:trans(0x%llx 0x%llx)err:0x%llx",
> +			 inst->vsi->wdma_start_addr,
> +			 inst->vsi->wdma_end_addr,
> +			 inst->vsi->wdma_err_addr);
> +
> +	mtk_vcodec_debug(inst, "slice(0x%llx 0x%llx) rprt((0x%llx 0x%llx))",
> +			 inst->vsi->slice_bc_start_addr,
> +			 inst->vsi->slice_bc_end_addr,
> +			 inst->vsi->trans_start,
> +			 inst->vsi->trans_end);
> +	err = vpu_dec_start(vpu, data, 2);
> +	if (err) {
> +		mtk_vcodec_debug(inst, "lat decode err: %d", err);
> +		goto err_free_fb_out;
> +	}
> +
> +	/* wait decoder done interrupt */
> +	timeout = mtk_vcodec_wait_for_done_ctx(inst->ctx, MTK_INST_IRQ_RECEIVED,
> +					       WAIT_INTR_TIMEOUT_MS, MTK_VDEC_LAT0);
> +	inst->vsi->dec.timeout = !!timeout;
> +
> +	err = vpu_dec_end(vpu);
> +	if (err == SLICE_HEADER_FULL || timeout || err == TRANS_BUFFER_FULL) {
> +		err = -EINVAL;
> +		goto err_free_fb_out;
> +	}
> +
> +	share_info->trans_end = inst->ctx->msg_queue.wdma_addr.dma_addr +
> +		inst->vsi->wdma_end_addr_offset;
> +	share_info->trans_start = inst->ctx->msg_queue.wdma_wptr_addr;
> +	share_info->nal_info = inst->vsi->dec.nal_info;
> +	vdec_msg_queue_update_ube_wptr(&lat_buf->ctx->msg_queue,
> +				       share_info->trans_end);
> +
> +	memcpy_fromio(&share_info->h264_slice_params, &inst->vsi->h264_slice_params,
> +		      sizeof(share_info->h264_slice_params));
> +	vdec_msg_queue_qbuf(&inst->ctx->dev->msg_queue_core_ctx, lat_buf);
> +
> +	inst->slice_dec_num++;
> +	return 0;
> +
> +err_free_fb_out:
> +	mtk_vcodec_err(inst, "slice dec number: %d err: %d", inst->slice_dec_num, err);
> +	return err;
> +}
> +
> +static int vdec_h264_slice_get_param(void *h_vdec, enum vdec_get_param_type type,
> +				     void *out)
> +{
> +	struct vdec_h264_slice_inst *inst = h_vdec;
> +
> +	switch (type) {
> +	case GET_PARAM_PIC_INFO:
> +		vdec_h264_slice_get_pic_info(inst);
> +		break;
> +	case GET_PARAM_DPB_SIZE:
> +		*(unsigned int *)out = 6;
> +		break;
> +	case GET_PARAM_CROP_INFO:
> +		vdec_h264_slice_get_crop_info(inst, out);
> +		break;
> +	default:
> +		mtk_vcodec_err(inst, "invalid get parameter type=%d", type);
> +		return -EINVAL;
> +	}
> +	return 0;
> +}
> +
> +const struct vdec_common_if vdec_h264_slice_lat_if = {
> +	.init		= vdec_h264_slice_init,
> +	.decode		= vdec_h264_slice_decode,
> +	.get_param	= vdec_h264_slice_get_param,
> +	.deinit		= vdec_h264_slice_deinit,
> +};
> diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.c b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
> index c93dd0ea3537..c17a7815e1bb 100644
> --- a/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
> +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
> @@ -20,7 +20,13 @@ int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc)
>  
>  	switch (fourcc) {
>  	case V4L2_PIX_FMT_H264_SLICE:
> -		ctx->dec_if = &vdec_h264_slice_if;
> +		if (ctx->dev->vdec_pdata->hw_arch == MTK_VDEC_PURE_SINGLE_CORE) {
> +			ctx->dec_if = &vdec_h264_slice_if;
> +			ctx->hw_id = MTK_VDEC_CORE;
> +		} else {
> +			ctx->dec_if = &vdec_h264_slice_lat_if;
> +			ctx->hw_id = MTK_VDEC_LAT0;
> +		}
>  		break;
>  	case V4L2_PIX_FMT_H264:
>  		ctx->dec_if = &vdec_h264_if;
> diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.h b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> index d467e8af4a84..6ce848e74167 100644
> --- a/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> @@ -56,6 +56,7 @@ struct vdec_fb_node {
>  
>  extern const struct vdec_common_if vdec_h264_if;
>  extern const struct vdec_common_if vdec_h264_slice_if;
> +extern const struct vdec_common_if vdec_h264_slice_lat_if;
>  extern const struct vdec_common_if vdec_vp8_if;
>  extern const struct vdec_common_if vdec_vp9_if;
>  
> diff --git a/include/linux/remoteproc/mtk_scp.h b/include/linux/remoteproc/mtk_scp.h
> index b47416f7aeb8..7c2b7cc9fe6c 100644
> --- a/include/linux/remoteproc/mtk_scp.h
> +++ b/include/linux/remoteproc/mtk_scp.h
> @@ -41,6 +41,8 @@ enum scp_ipi_id {
>  	SCP_IPI_ISP_FRAME,
>  	SCP_IPI_FD_CMD,
>  	SCP_IPI_CROS_HOST_CMD,
> +	SCP_IPI_VDEC_LAT,
> +	SCP_IPI_VDEC_CORE,
>  	SCP_IPI_NS_SERVICE = 0xFF,
>  	SCP_IPI_MAX = 0x100,
>  };