Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <0672e801-1489-f222-2143-e0e7317d7eaf@collabora.com>
Date:   Thu, 17 Nov 2022 13:42:19 +0100
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.4.2
Subject: Re: [RFC PATCH v6] media: mediatek: vcodec: support stateless AV1
 decoder
To:     Xiaoyong Lu <xiaoyong.lu@mediatek.com>,
        Yunfei Dong <yunfei.dong@mediatek.com>,
        Alexandre Courbot <acourbot@chromium.org>,
        Nicolas Dufresne <nicolas@ndufresne.ca>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Benjamin Gaignard <benjamin.gaignard@collabora.com>,
        Tiffany Lin <tiffany.lin@mediatek.com>,
        Andrew-CT Chen <andrew-ct.chen@mediatek.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Tomasz Figa <tfiga@google.com>
Cc:     George Sun <george.sun@mediatek.com>,
        Hsin-Yi Wang <hsinyi@chromium.org>,
        Fritz Koenig <frkoenig@chromium.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Irui Wang <irui.wang@mediatek.com>,
        Steve Cho <stevecho@chromium.org>, linux-media@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, srv_heupstream@mediatek.com,
        linux-mediatek@lists.infradead.org,
        Project_Global_Chrome_Upstream_Group@mediatek.com
References: <20221117061742.29702-1-xiaoyong.lu@mediatek.com>
Content-Language: en-US
From:   Andrzej Pietrasiewicz <andrzej.p@collabora.com>
In-Reply-To: <20221117061742.29702-1-xiaoyong.lu@mediatek.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk

Hi Xiaoyong Lu,

Sorry about chiming in only at v6. Please see inline below.

Andrzej

W dniu 17.11.2022 o 07:17, Xiaoyong Lu pisze:
> Add mediatek av1 decoder linux driver which use the stateless API in
> MT8195.
> 
> Signed-off-by: Xiaoyong Lu<xiaoyong.lu@mediatek.com>
> ---
> Changes from v5:
> 
> - change av1 PROFILE and LEVEL cfg
> - test by av1 fluster, result is 173/239
> 
> Changes from v4:
> 
> - convert vb2_find_timestamp to vb2_find_buffer
> - test by av1 fluster, result is 173/239
> 
> Changes from v3:
> 
> - modify comment for struct vdec_av1_slice_slot
> - add define SEG_LVL_ALT_Q
> - change use_lr/use_chroma_lr parse from av1 spec
> - use ARRAY_SIZE to replace size for loop_filter_level and loop_filter_mode_deltas
> - change array size of loop_filter_mode_deltas from 4 to 2
> - add define SECONDARY_FILTER_STRENGTH_NUM_BITS
> - change some hex values from upper case to lower case
> - change *dpb_sz equal to V4L2_AV1_TOTAL_REFS_PER_FRAME + 1
> - test by av1 fluster, result is 173/239
> 
> Changes from v2:
> 
> - Match with av1 uapi v3 modify
> - test by av1 fluster, result is 173/239
> 
> ---
> Reference series:
> [1]: v3 of this series is presend by Daniel Almeida.
>       message-id: 20220825225312.564619-1-daniel.almeida@collabora.com
> 
>   .../media/platform/mediatek/vcodec/Makefile   |    1 +
>   .../vcodec/mtk_vcodec_dec_stateless.c         |   47 +-
>   .../platform/mediatek/vcodec/mtk_vcodec_drv.h |    1 +
>   .../vcodec/vdec/vdec_av1_req_lat_if.c         | 2234 +++++++++++++++++
>   .../platform/mediatek/vcodec/vdec_drv_if.c    |    4 +
>   .../platform/mediatek/vcodec/vdec_drv_if.h    |    1 +
>   .../platform/mediatek/vcodec/vdec_msg_queue.c |   27 +
>   .../platform/mediatek/vcodec/vdec_msg_queue.h |    4 +
>   8 files changed, 2318 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/media/platform/mediatek/vcodec/vdec/vdec_av1_req_lat_if.c
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/Makefile b/drivers/media/platform/mediatek/vcodec/Makefile
> index 93e7a343b5b0e..7537259130072 100644
> --- a/drivers/media/platform/mediatek/vcodec/Makefile
> +++ b/drivers/media/platform/mediatek/vcodec/Makefile
> @@ -10,6 +10,7 @@ mtk-vcodec-dec-y := vdec/vdec_h264_if.o \
>   		vdec/vdec_vp8_req_if.o \
>   		vdec/vdec_vp9_if.o \
>   		vdec/vdec_vp9_req_lat_if.o \
> +		vdec/vdec_av1_req_lat_if.o \
>   		vdec/vdec_h264_req_if.o \
>   		vdec/vdec_h264_req_common.o \
>   		vdec/vdec_h264_req_multi_if.o \
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c
> index c45bd2599bb2d..ceb6fabc67749 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c
> @@ -107,11 +107,51 @@ static const struct mtk_stateless_control mtk_stateless_controls[] = {
>   		},
>   		.codec_type = V4L2_PIX_FMT_VP9_FRAME,
>   	},
> +	{
> +		.cfg = {
> +			.id = V4L2_CID_STATELESS_AV1_SEQUENCE,
> +
> +		},
> +		.codec_type = V4L2_PIX_FMT_AV1_FRAME,
> +	},
> +	{
> +		.cfg = {
> +			.id = V4L2_CID_STATELESS_AV1_FRAME,
> +
> +		},
> +		.codec_type = V4L2_PIX_FMT_AV1_FRAME,
> +	},
> +	{
> +		.cfg = {
> +			.id = V4L2_CID_STATELESS_AV1_TILE_GROUP_ENTRY,
> +			.dims = { V4L2_AV1_MAX_TILE_COUNT },
> +
> +		},
> +		.codec_type = V4L2_PIX_FMT_AV1_FRAME,
> +	},
> +	{
> +		.cfg = {
> +			.id = V4L2_CID_STATELESS_AV1_PROFILE,
> +			.min = V4L2_STATELESS_AV1_PROFILE_MAIN,
> +			.def = V4L2_STATELESS_AV1_PROFILE_MAIN,
> +			.max = V4L2_STATELESS_AV1_PROFILE_MAIN,
> +		},
> +		.codec_type = V4L2_PIX_FMT_AV1_FRAME,
> +	},
> +	{
> +		.cfg = {
> +			.id = V4L2_CID_STATELESS_AV1_LEVEL,
> +			.min = V4L2_STATELESS_AV1_LEVEL_2_0,
> +			.def = V4L2_STATELESS_AV1_LEVEL_4_0,
> +			.max = V4L2_STATELESS_AV1_LEVEL_5_1,
> +		},
> +		.codec_type = V4L2_PIX_FMT_AV1_FRAME,
> +	},
>   };
>   
>   #define NUM_CTRLS ARRAY_SIZE(mtk_stateless_controls)
>   
> -static struct mtk_video_fmt mtk_video_formats[5];
> +static struct mtk_video_fmt mtk_video_formats[6];
>   
>   static struct mtk_video_fmt default_out_format;
>   static struct mtk_video_fmt default_cap_format;
> @@ -351,6 +391,7 @@ static void mtk_vcodec_add_formats(unsigned int fourcc,
>   	case V4L2_PIX_FMT_H264_SLICE:
>   	case V4L2_PIX_FMT_VP8_FRAME:
>   	case V4L2_PIX_FMT_VP9_FRAME:
> +	case V4L2_PIX_FMT_AV1_FRAME:
>   		mtk_video_formats[count_formats].fourcc = fourcc;
>   		mtk_video_formats[count_formats].type = MTK_FMT_DEC;
>   		mtk_video_formats[count_formats].num_planes = 1;
> @@ -407,6 +448,10 @@ static void mtk_vcodec_get_supported_formats(struct mtk_vcodec_ctx *ctx)
>   		mtk_vcodec_add_formats(V4L2_PIX_FMT_VP9_FRAME, ctx);
>   		out_format_count++;
>   	}
> +	if (ctx->dev->dec_capability & MTK_VDEC_FORMAT_AV1_FRAME) {
> +		mtk_vcodec_add_formats(V4L2_PIX_FMT_AV1_FRAME, ctx);
> +		out_format_count++;
> +	}
>   
>   	if (cap_format_count)
>   		default_cap_format = mtk_video_formats[cap_format_count - 1];
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
> index 6a47a11ff654a..a6db972b1ff72 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
> @@ -344,6 +344,7 @@ enum mtk_vdec_format_types {
>   	MTK_VDEC_FORMAT_H264_SLICE = 0x100,
>   	MTK_VDEC_FORMAT_VP8_FRAME = 0x200,
>   	MTK_VDEC_FORMAT_VP9_FRAME = 0x400,
> +	MTK_VDEC_FORMAT_AV1_FRAME = 0x800,
>   	MTK_VCODEC_INNER_RACING = 0x20000,
>   };
>   
> diff --git a/drivers/media/platform/mediatek/vcodec/vdec/vdec_av1_req_lat_if.c b/drivers/media/platform/mediatek/vcodec/vdec/vdec_av1_req_lat_if.c
> new file mode 100644
> index 0000000000000..2ac77175dad7c
> --- /dev/null
> +++ b/drivers/media/platform/mediatek/vcodec/vdec/vdec_av1_req_lat_if.c
> @@ -0,0 +1,2234 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2022 MediaTek Inc.
> + * Author: Xiaoyong Lu <xiaoyong.lu@mediatek.com>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/slab.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"
> +
> +#define AV1_MAX_FRAME_BUF_COUNT		(V4L2_AV1_TOTAL_REFS_PER_FRAME + 1)
> +#define AV1_TILE_BUF_SIZE		64
> +#define AV1_SCALE_SUBPEL_BITS		10
> +#define AV1_REF_SCALE_SHIFT		14
> +#define AV1_REF_NO_SCALE		BIT(AV1_REF_SCALE_SHIFT)
> +#define AV1_REF_INVALID_SCALE		-1
> +
> +#define AV1_INVALID_IDX			-1
> +
> +#define AV1_DIV_ROUND_UP_POW2(value, n)			\
> +({							\
> +	typeof(n) _n  = n;				\
> +	typeof(value) _value = value;			\
> +	(_value + (BIT(_n) >> 1)) >> _n;		\
> +})
> +
> +#define AV1_DIV_ROUND_UP_POW2_SIGNED(value, n)				\
> +({									\
> +	typeof(n) _n_  = n;						\
> +	typeof(value) _value_ = value;					\
> +	(((_value_) < 0) ? -AV1_DIV_ROUND_UP_POW2(-(_value_), (_n_))	\
> +		: AV1_DIV_ROUND_UP_POW2((_value_), (_n_)));		\
> +})
> +
> +#define BIT_FLAG(x, bit)		(!!((x)->flags & (bit)))
> +#define SEGMENTATION_FLAG(x, name)	(!!((x)->flags & V4L2_AV1_SEGMENTATION_FLAG_##name))
> +#define QUANT_FLAG(x, name)		(!!((x)->flags & V4L2_AV1_QUANTIZATION_FLAG_##name))
> +#define SEQUENCE_FLAG(x, name)		(!!((x)->flags & V4L2_AV1_SEQUENCE_FLAG_##name))
> +#define FH_FLAG(x, name)		(!!((x)->flags & V4L2_AV1_FRAME_FLAG_##name))
> +
> +#define MINQ 0
> +#define MAXQ 255
> +
> +#define DIV_LUT_PREC_BITS 14
> +#define DIV_LUT_BITS 8
> +#define DIV_LUT_NUM BIT(DIV_LUT_BITS)
> +#define WARP_PARAM_REDUCE_BITS 6
> +#define WARPEDMODEL_PREC_BITS 16
> +
> +#define SEG_LVL_ALT_Q 0
> +#define SECONDARY_FILTER_STRENGTH_NUM_BITS 2
> +
> +static const short div_lut[DIV_LUT_NUM + 1] = {
> +	16384, 16320, 16257, 16194, 16132, 16070, 16009, 15948, 15888, 15828, 15768,
> +	15709, 15650, 15592, 15534, 15477, 15420, 15364, 15308, 15252, 15197, 15142,
> +	15087, 15033, 14980, 14926, 14873, 14821, 14769, 14717, 14665, 14614, 14564,
> +	14513, 14463, 14413, 14364, 14315, 14266, 14218, 14170, 14122, 14075, 14028,
> +	13981, 13935, 13888, 13843, 13797, 13752, 13707, 13662, 13618, 13574, 13530,
> +	13487, 13443, 13400, 13358, 13315, 13273, 13231, 13190, 13148, 13107, 13066,
> +	13026, 12985, 12945, 12906, 12866, 12827, 12788, 12749, 12710, 12672, 12633,
> +	12596, 12558, 12520, 12483, 12446, 12409, 12373, 12336, 12300, 12264, 12228,
> +	12193, 12157, 12122, 12087, 12053, 12018, 11984, 11950, 11916, 11882, 11848,
> +	11815, 11782, 11749, 11716, 11683, 11651, 11619, 11586, 11555, 11523, 11491,
> +	11460, 11429, 11398, 11367, 11336, 11305, 11275, 11245, 11215, 11185, 11155,
> +	11125, 11096, 11067, 11038, 11009, 10980, 10951, 10923, 10894, 10866, 10838,
> +	10810, 10782, 10755, 10727, 10700, 10673, 10645, 10618, 10592, 10565, 10538,
> +	10512, 10486, 10460, 10434, 10408, 10382, 10356, 10331, 10305, 10280, 10255,
> +	10230, 10205, 10180, 10156, 10131, 10107, 10082, 10058, 10034, 10010, 9986,
> +	9963,  9939,  9916,  9892,  9869,  9846,  9823,  9800,  9777,  9754,  9732,
> +	9709,  9687,  9664,  9642,  9620,  9598,  9576,  9554,  9533,  9511,  9489,
> +	9468,  9447,  9425,  9404,  9383,  9362,  9341,  9321,  9300,  9279,  9259,
> +	9239,  9218,  9198,  9178,  9158,  9138,  9118,  9098,  9079,  9059,  9039,
> +	9020,  9001,  8981,  8962,  8943,  8924,  8905,  8886,  8867,  8849,  8830,
> +	8812,  8793,  8775,  8756,  8738,  8720,  8702,  8684,  8666,  8648,  8630,
> +	8613,  8595,  8577,  8560,  8542,  8525,  8508,  8490,  8473,  8456,  8439,
> +	8422,  8405,  8389,  8372,  8355,  8339,  8322,  8306,  8289,  8273,  8257,
> +	8240,  8224,  8208,  8192,
> +};
> +
> +/**
> + * struct vdec_av1_slice_init_vsi - VSI used to initialize instance
> + * @architecture:	architecture type
> + * @reserved:		reserved
> + * @core_vsi:		for core vsi
> + * @cdf_table_addr:	cdf table addr
> + * @cdf_table_size:	cdf table size
> + * @iq_table_addr:	iq table addr
> + * @iq_table_size:	iq table size
> + * @vsi_size:		share vsi structure size
> + */
> +struct vdec_av1_slice_init_vsi {
> +	u32 architecture;
> +	u32 reserved;
> +	u64 core_vsi;
> +	u64 cdf_table_addr;
> +	u32 cdf_table_size;
> +	u64 iq_table_addr;
> +	u32 iq_table_size;
> +	u32 vsi_size;
> +};
> +
> +/**
> + * struct vdec_av1_slice_mem - memory address and size
> + * @buf:		dma_addr padding
> + * @dma_addr:		buffer address
> + * @size:		buffer size
> + * @dma_addr_end:	buffer end address
> + * @padding:		for padding
> + */
> +struct vdec_av1_slice_mem {
> +	union {
> +		u64 buf;
> +		dma_addr_t dma_addr;
> +	};
> +	union {
> +		size_t size;
> +		dma_addr_t dma_addr_end;
> +		u64 padding;
> +	};
> +};
> +
> +/**
> + * struct vdec_av1_slice_state - decoding state
> + * @err                   : err type for decode
> + * @full                  : transcoded buffer is full or not
> + * @timeout               : decode timeout or not
> + * @perf                  : performance enable
> + * @crc                   : hw checksum
> + * @out_size              : hw output size
> + */
> +struct vdec_av1_slice_state {
> +	int err;
> +	u32 full;
> +	u32 timeout;
> +	u32 perf;
> +	u32 crc[16];
> +	u32 out_size;
> +};
> +
> +/*
> + * enum vdec_av1_slice_resolution_level - resolution level
> + */
> +enum vdec_av1_slice_resolution_level {
> +	AV1_RES_NONE,
> +	AV1_RES_FHD,
> +	AV1_RES_4K,
> +	AV1_RES_8K,
> +};
> +
> +/*
> + * enum vdec_av1_slice_frame_type - av1 frame type
> + */
> +enum vdec_av1_slice_frame_type {
> +	AV1_KEY_FRAME = 0,
> +	AV1_INTER_FRAME,
> +	AV1_INTRA_ONLY_FRAME,
> +	AV1_SWITCH_FRAME,
> +	AV1_FRAME_TYPES,
> +};
> +
> +/*
> + * enum vdec_av1_slice_reference_mode - reference mode type
> + */
> +enum vdec_av1_slice_reference_mode {
> +	AV1_SINGLE_REFERENCE = 0,
> +	AV1_COMPOUND_REFERENCE,
> +	AV1_REFERENCE_MODE_SELECT,
> +	AV1_REFERENCE_MODES,
> +};
> +
> +/**
> + * struct vdec_av1_slice_tile_group - info for each tile
> + * @num_tiles:			tile number
> + * @tile_size:			input size for each tile
> + * @tile_start_offset:		tile offset to input buffer
> + */
> +struct vdec_av1_slice_tile_group {
> +	u32 num_tiles;
> +	u32 tile_size[V4L2_AV1_MAX_TILE_COUNT];
> +	u32 tile_start_offset[V4L2_AV1_MAX_TILE_COUNT];
> +};
> +
> +/**
> + * struct vdec_av1_slice_scale_factors - scale info for each ref frame
> + * @is_scaled:  frame is scaled or not
> + * @x_scale:    frame width scale coefficient
> + * @y_scale:    frame height scale coefficient
> + * @x_step:     width step for x_scale
> + * @y_step:     height step for y_scale
> + */
> +struct vdec_av1_slice_scale_factors {
> +	u8 is_scaled;
> +	int x_scale;
> +	int y_scale;
> +	int x_step;
> +	int y_step;
> +};
> +
> +/**
> + * struct vdec_av1_slice_frame_refs - ref frame info
> + * @ref_fb_idx:         ref slot index
> + * @ref_map_idx:        ref frame index
> + * @scale_factors:      scale factors for each ref frame
> + */
> +struct vdec_av1_slice_frame_refs {
> +	int ref_fb_idx;
> +	int ref_map_idx;
> +	struct vdec_av1_slice_scale_factors scale_factors;
> +};
> +
> +/**
> + * struct vdec_av1_slice_gm - AV1 Global Motion parameters
> + * @wmtype:     The type of global motion transform used
> + * @wmmat:      gm_params
> + * @alpha:      alpha info
> + * @beta:       beta info
> + * @gamma:      gamma info
> + * @delta:      delta info
> + * @invalid:    is invalid or not
> + */
> +struct vdec_av1_slice_gm {
> +	int wmtype;
> +	int wmmat[8];
> +	short alpha;
> +	short beta;
> +	short gamma;
> +	short delta;
> +	char invalid;
> +};
> +
> +/**
> + * struct vdec_av1_slice_sm - AV1 Skip Mode parameters
> + * @skip_mode_allowed:  Skip Mode is allowed or not
> + * @skip_mode_present:  specified that the skip_mode will be present or not
> + * @skip_mode_frame:    specifies the frames to use for compound prediction
> + */
> +struct vdec_av1_slice_sm {
> +	u8 skip_mode_allowed;
> +	u8 skip_mode_present;
> +	int skip_mode_frame[2];
> +};
> +
> +/**
> + * struct vdec_av1_slice_seg - AV1 Segmentation params
> + * @segmentation_enabled:        this frame makes use of the segmentation tool or not
> + * @segmentation_update_map:     segmentation map are updated during the decoding frame
> + * @segmentation_temporal_update:segmentation map are coded relative the existing segmentaion map
> + * @segmentation_update_data:    new parameters are about to be specified for each segment
> + * @feature_data:                specifies the feature data for a segment feature
> + * @feature_enabled_mask:        the corresponding feature value is coded or not.
> + * @segid_preskip:               segment id will be read before the skip syntax element.
> + * @last_active_segid:           the highest numbered segment id that has some enabled feature
> + */
> +struct vdec_av1_slice_seg {
> +	u8 segmentation_enabled;
> +	u8 segmentation_update_map;
> +	u8 segmentation_temporal_update;
> +	u8 segmentation_update_data;
> +	int feature_data[V4L2_AV1_MAX_SEGMENTS][V4L2_AV1_SEG_LVL_MAX];
> +	u16 feature_enabled_mask[V4L2_AV1_MAX_SEGMENTS];
> +	int segid_preskip;
> +	int last_active_segid;
> +};
> +
> +/**
> + * struct vdec_av1_slice_delta_q_lf - AV1 Loop Filter delta parameters
> + * @delta_q_present:    specified whether quantizer index delta values are present
> + * @delta_q_res:        specifies the left shift which should be applied to decoded quantizer index
> + * @delta_lf_present:   specifies whether loop filter delta values are present
> + * @delta_lf_res:       specifies the left shift which should be applied to decoded
> + *                      loop filter delta values
> + * @delta_lf_multi:     specifies that separate loop filter deltas are sent for horizontal
> + *                      luma edges,vertical luma edges,the u edges, and the v edges.
> + */
> +struct vdec_av1_slice_delta_q_lf {
> +	u8 delta_q_present;
> +	u8 delta_q_res;
> +	u8 delta_lf_present;
> +	u8 delta_lf_res;
> +	u8 delta_lf_multi;
> +};
> +
> +/**
> + * struct vdec_av1_slice_quantization - AV1 Quantization params
> + * @base_q_idx:         indicates the base frame qindex. This is used for Y AC
> + *                      coefficients and as the base value for the other quantizers.
> + * @qindex:             qindex
> + * @delta_qydc:         indicates the Y DC quantizer relative to base_q_idx
> + * @delta_qudc:         indicates the U DC quantizer relative to base_q_idx.
> + * @delta_quac:         indicates the U AC quantizer relative to base_q_idx
> + * @delta_qvdc:         indicates the V DC quantizer relative to base_q_idx
> + * @delta_qvac:         indicates the V AC quantizer relative to base_q_idx
> + * @using_qmatrix:      specifies that the quantizer matrix will be used to
> + *                      compute quantizers
> + * @qm_y:               specifies the level in the quantizer matrix that should
> + *                      be used for luma plane decoding
> + * @qm_u:               specifies the level in the quantizer matrix that should
> + *                      be used for chroma U plane decoding.
> + * @qm_v:               specifies the level in the quantizer matrix that should be
> + *                      used for chroma V plane decoding
> + */
> +struct vdec_av1_slice_quantization {
> +	int base_q_idx;
> +	int qindex[V4L2_AV1_MAX_SEGMENTS];
> +	int delta_qydc;
> +	int delta_qudc;
> +	int delta_quac;
> +	int delta_qvdc;
> +	int delta_qvac;
> +	u8 using_qmatrix;
> +	u8 qm_y;
> +	u8 qm_u;
> +	u8 qm_v;
> +};
> +
> +/**
> + * struct vdec_av1_slice_lr - AV1 Loop Restauration parameters
> + * @use_lr:                     whether to use loop restoration
> + * @use_chroma_lr:              whether to use chroma loop restoration
> + * @frame_restoration_type:     specifies the type of restoration used for each plane
> + * @loop_restoration_size:      pecifies the size of loop restoration units in units
> + *                              of samples in the current plane
> + */
> +struct vdec_av1_slice_lr {
> +	u8 use_lr;
> +	u8 use_chroma_lr;
> +	u8 frame_restoration_type[V4L2_AV1_NUM_PLANES_MAX];
> +	u32 loop_restoration_size[V4L2_AV1_NUM_PLANES_MAX];
> +};
> +
> +/**
> + * struct vdec_av1_slice_loop_filter - AV1 Loop filter parameters
> + * @loop_filter_level:          an array containing loop filter strength values.
> + * @loop_filter_ref_deltas:     contains the adjustment needed for the filter
> + *                              level based on the chosen reference frame
> + * @loop_filter_mode_deltas:    contains the adjustment needed for the filter
> + *                              level based on the chosen mode
> + * @loop_filter_sharpness:      indicates the sharpness level. The loop_filter_level
> + *                              and loop_filter_sharpness together determine when
> + *                              a block edge is filtered, and by how much the
> + *                              filtering can change the sample values
> + * @loop_filter_delta_enabled:  filetr level depends on the mode and reference
> + *                              frame used to predict a block
> + */
> +struct vdec_av1_slice_loop_filter {
> +	u8 loop_filter_level[4];
> +	int loop_filter_ref_deltas[V4L2_AV1_TOTAL_REFS_PER_FRAME];
> +	int loop_filter_mode_deltas[2];
> +	u8 loop_filter_sharpness;
> +	u8 loop_filter_delta_enabled;
> +};
> +
> +/**
> + * struct vdec_av1_slice_cdef - AV1 CDEF parameters
> + * @cdef_damping:       controls the amount of damping in the deringing filter
> + * @cdef_y_strength:    specifies the strength of the primary filter and secondary filter
> + * @cdef_uv_strength:   specifies the strength of the primary filter and secondary filter
> + * @cdef_bits:          specifies the number of bits needed to specify which
> + *                      CDEF filter to apply
> + */
> +struct vdec_av1_slice_cdef {
> +	u8 cdef_damping;
> +	u8 cdef_y_strength[8];
> +	u8 cdef_uv_strength[8];
> +	u8 cdef_bits;
> +};
> +
> +/**
> + * struct vdec_av1_slice_mfmv - AV1 mfmv parameters
> + * @mfmv_valid_ref:     mfmv_valid_ref
> + * @mfmv_dir:           mfmv_dir
> + * @mfmv_ref_to_cur:    mfmv_ref_to_cur
> + * @mfmv_ref_frame_idx: mfmv_ref_frame_idx
> + * @mfmv_count:         mfmv_count
> + */
> +struct vdec_av1_slice_mfmv {
> +	u32 mfmv_valid_ref[3];
> +	u32 mfmv_dir[3];
> +	int mfmv_ref_to_cur[3];
> +	int mfmv_ref_frame_idx[3];
> +	int mfmv_count;
> +};
> +
> +/**
> + * struct vdec_av1_slice_tile - AV1 Tile info
> + * @tile_cols:                  specifies the number of tiles across the frame
> + * @tile_rows:                  pecifies the number of tiles down the frame
> + * @mi_col_starts:              an array specifying the start column
> + * @mi_row_starts:              an array specifying the start row
> + * @context_update_tile_id:     specifies which tile to use for the CDF update
> + * @uniform_tile_spacing_flag:  tiles are uniformly spaced across the frame
> + *                              or the tile sizes are coded
> + */
> +struct vdec_av1_slice_tile {
> +	u8 tile_cols;
> +	u8 tile_rows;
> +	int mi_col_starts[V4L2_AV1_MAX_TILE_COLS + 1];
> +	int mi_row_starts[V4L2_AV1_MAX_TILE_ROWS + 1];
> +	u8 context_update_tile_id;
> +	u8 uniform_tile_spacing_flag;
> +};
> +
> +/**
> + * struct vdec_av1_slice_uncompressed_header - Represents an AV1 Frame Header OBU
> + * @use_ref_frame_mvs:          use_ref_frame_mvs flag
> + * @order_hint:                 specifies OrderHintBits least significant bits of the expected
> + * @gm:                         global motion param
> + * @upscaled_width:             the upscaled width
> + * @frame_width:                frame's width
> + * @frame_height:               frame's height
> + * @reduced_tx_set:             frame is restricted to a reduced subset of the full
> + *                              set of transform types
> + * @tx_mode:                    specifies how the transform size is determined
> + * @uniform_tile_spacing_flag:  tiles are uniformly spaced across the frame
> + *                              or the tile sizes are coded
> + * @interpolation_filter:       specifies the filter selection used for performing inter prediction
> + * @allow_warped_motion:        motion_mode may be present or not
> + * @is_motion_mode_switchable : euqlt to 0 specifies that only the SIMPLE motion mode will be used
> + * @reference_mode :            frame reference mode selected
> + * @allow_high_precision_mv:    specifies that motion vectors are specified to
> + *                              quarter pel precision or to eighth pel precision
> + * @allow_intra_bc:             ubducates that intra block copy may be used in this frame
> + * @force_integer_mv:           specifies motion vectors will always be integers or
> + *                              can contain fractional bits
> + * @allow_screen_content_tools: intra blocks may use palette encoding
> + * @error_resilient_mode:       error resislent mode is enable/disable
> + * @frame_type:                 specifies the AV1 frame type
> + * @primary_ref_frame:          specifies which reference frame contains the CDF values
> + *                              and other state that should be loaded at the start of the frame
> + *                              slots will be updated with the current frame after it is decoded
> + * @disable_frame_end_update_cdf:indicates the end of frame CDF update is disable or enable
> + * @disable_cdf_update:         specified whether the CDF update in the symbol
> + *                              decoding process should be disables
> + * @skip_mode:                  av1 skip mode parameters
> + * @seg:                        av1 segmentaon parameters
> + * @delta_q_lf:                 av1 delta loop fileter
> + * @quant:                      av1 Quantization params
> + * @lr:                         av1 Loop Restauration parameters
> + * @superres_denom:             the denominator for the upscaling ratio
> + * @loop_filter:                av1 Loop filter parameters
> + * @cdef:                       av1 CDEF parameters
> + * @mfmv:                       av1 mfmv parameters
> + * @tile:                       av1 Tile info
> + * @frame_is_intra:             intra frame
> + * @loss_less_array:            loss less array
> + * @coded_loss_less:            coded lsss less
> + * @mi_rows:                    size of mi unit in rows
> + * @mi_cols:                    size of mi unit in cols
> + */
> +struct vdec_av1_slice_uncompressed_header {
> +	u8 use_ref_frame_mvs;
> +	int order_hint;
> +	struct vdec_av1_slice_gm gm[V4L2_AV1_TOTAL_REFS_PER_FRAME];
> +	u32 upscaled_width;
> +	u32 frame_width;
> +	u32 frame_height;
> +	u8 reduced_tx_set;
> +	u8 tx_mode;
> +	u8 uniform_tile_spacing_flag;
> +	u8 interpolation_filter;
> +	u8 allow_warped_motion;
> +	u8 is_motion_mode_switchable;
> +	u8 reference_mode;
> +	u8 allow_high_precision_mv;
> +	u8 allow_intra_bc;
> +	u8 force_integer_mv;
> +	u8 allow_screen_content_tools;
> +	u8 error_resilient_mode;
> +	u8 frame_type;
> +	u8 primary_ref_frame;
> +	u8 disable_frame_end_update_cdf;
> +	u32 disable_cdf_update;
> +	struct vdec_av1_slice_sm skip_mode;
> +	struct vdec_av1_slice_seg seg;
> +	struct vdec_av1_slice_delta_q_lf delta_q_lf;
> +	struct vdec_av1_slice_quantization quant;
> +	struct vdec_av1_slice_lr lr;
> +	u32 superres_denom;
> +	struct vdec_av1_slice_loop_filter loop_filter;
> +	struct vdec_av1_slice_cdef cdef;
> +	struct vdec_av1_slice_mfmv mfmv;
> +	struct vdec_av1_slice_tile tile;
> +	u8 frame_is_intra;
> +	u8 loss_less_array[V4L2_AV1_MAX_SEGMENTS];
> +	u8 coded_loss_less;
> +	u32 mi_rows;
> +	u32 mi_cols;
> +};
> +
> +/**
> + * struct vdec_av1_slice_seq_header - Represents an AV1 Sequence OBU
> + * @bitdepth:                   the bitdepth to use for the sequence
> + * @enable_superres:            specifies whether the use_superres syntax element may be present
> + * @enable_filter_intra:        specifies the use_filter_intra syntax element may be present
> + * @enable_intra_edge_filter:   whether the intra edge filtering process should be enabled
> + * @enable_interintra_compound: specifies the mode info fo rinter blocks may
> + *                              contain the syntax element interintra
> + * @enable_masked_compound:     specifies the mode info fo rinter blocks may
> + *                              contain the syntax element compound_type
> + * @enable_dual_filter:         the inter prediction filter type may be specified independently
> + * @enable_jnt_comp:            distance weights process may be used for inter prediction
> + * @mono_chrome:                indicates the video does not contain U and V color planes
> + * @enable_order_hint:          tools based on the values of order hints may be used
> + * @order_hint_bits:            the number of bits used for the order_hint field at each frame
> + * @use_128x128_superblock:     indicates superblocks contain 128*128 luma samples
> + * @subsampling_x:              the chroma subsamling format
> + * @subsampling_y:              the chroma subsamling format
> + * @max_frame_width:            the maximum frame width for the frames represented by sequence
> + * @max_frame_height:           the maximum frame height for the frames represented by sequence
> + */
> +struct vdec_av1_slice_seq_header {
> +	u8 bitdepth;
> +	u8 enable_superres;
> +	u8 enable_filter_intra;
> +	u8 enable_intra_edge_filter;
> +	u8 enable_interintra_compound;
> +	u8 enable_masked_compound;
> +	u8 enable_dual_filter;
> +	u8 enable_jnt_comp;
> +	u8 mono_chrome;
> +	u8 enable_order_hint;
> +	u8 order_hint_bits;
> +	u8 use_128x128_superblock;
> +	u8 subsampling_x;
> +	u8 subsampling_y;
> +	u32 max_frame_width;
> +	u32 max_frame_height;
> +};
> +
> +/**
> + * struct vdec_av1_slice_frame - Represents current Frame info
> + * @uh:                         uncompressed header info
> + * @seq:                        sequence header info
> + * @large_scale_tile:           is large scale mode
> + * @cur_ts:                     current frame timestamp
> + * @prev_fb_idx:                prev slot id
> + * @ref_frame_sign_bias:        arrays for ref_frame sign bias
> + * @order_hints:                arrays for ref_frame order hint
> + * @ref_frame_valid:            arrays for valid ref_frame
> + * @ref_frame_map:              map to slot frame info
> + * @frame_refs:                 ref_frame info
> + */
> +struct vdec_av1_slice_frame {
> +	struct vdec_av1_slice_uncompressed_header uh;
> +	struct vdec_av1_slice_seq_header seq;
> +	u8 large_scale_tile;
> +	u64 cur_ts;
> +	int prev_fb_idx;
> +	u8 ref_frame_sign_bias[V4L2_AV1_TOTAL_REFS_PER_FRAME];
> +	u32 order_hints[V4L2_AV1_REFS_PER_FRAME];
> +	u32 ref_frame_valid[V4L2_AV1_REFS_PER_FRAME];
> +	int ref_frame_map[V4L2_AV1_TOTAL_REFS_PER_FRAME];
> +	struct vdec_av1_slice_frame_refs frame_refs[V4L2_AV1_REFS_PER_FRAME];
> +};
> +
> +/**
> + * struct vdec_av1_slice_work_buffer - work buffer for lat
> + * @mv_addr:    mv buffer memory info
> + * @cdf_addr:   cdf buffer memory info
> + * @segid_addr: segid buffer memory info
> + */
> +struct vdec_av1_slice_work_buffer {
> +	struct vdec_av1_slice_mem mv_addr;
> +	struct vdec_av1_slice_mem cdf_addr;
> +	struct vdec_av1_slice_mem segid_addr;
> +};
> +
> +/**
> + * struct vdec_av1_slice_frame_info - frame info for each slot
> + * @frame_type:         frame type
> + * @frame_is_intra:     is intra frame
> + * @order_hint:         order hint
> + * @order_hints:        referece frame order hint
> + * @upscaled_width:     upscale width
> + * @pic_pitch:          buffer pitch
> + * @frame_width:        frane width
> + * @frame_height:       frame height
> + * @mi_rows:            rows in mode info
> + * @mi_cols:            cols in mode info
> + * @ref_count:          mark to reference frame counts
> + */
> +struct vdec_av1_slice_frame_info {
> +	u8 frame_type;
> +	u8 frame_is_intra;
> +	int order_hint;
> +	u32 order_hints[V4L2_AV1_REFS_PER_FRAME];
> +	u32 upscaled_width;
> +	u32 pic_pitch;
> +	u32 frame_width;
> +	u32 frame_height;
> +	u32 mi_rows;
> +	u32 mi_cols;
> +	int ref_count;
> +};
> +
> +/**
> + * struct vdec_av1_slice_slot - slot info that needs to be saved in the global instance
> + * @frame_info: frame info for each slot
> + * @timestamp:  time stamp info
> + */
> +struct vdec_av1_slice_slot {
> +	struct vdec_av1_slice_frame_info frame_info[AV1_MAX_FRAME_BUF_COUNT];
> +	u64 timestamp[AV1_MAX_FRAME_BUF_COUNT];
> +};
> +
> +/**
> + * struct vdec_av1_slice_fb - frame buffer for decoding
> + * @y:  current y buffer address info
> + * @c:  current c buffer address info
> + */
> +struct vdec_av1_slice_fb {
> +	struct vdec_av1_slice_mem y;
> +	struct vdec_av1_slice_mem c;
> +};
> +
> +/**
> + * struct vdec_av1_slice_vsi - exchange frame information between Main CPU and MicroP
> + * @bs:			input buffer info
> + * @work_buffer:	working buffe for hw
> + * @cdf_table:		cdf_table buffer
> + * @cdf_tmp:		cdf temp buffer
> + * @rd_mv:		mv buffer for lat output , core input
> + * @ube:		ube buffer
> + * @trans:		transcoded buffer
> + * @err_map:		err map buffer
> + * @row_info:		row info buffer
> + * @fb:			current y/c buffer
> + * @ref:		ref y/c buffer
> + * @iq_table:		iq table buffer
> + * @tile:		tile buffer
> + * @slots:		slots info for each frame
> + * @slot_id:		current frame slot id
> + * @frame:		current frame info
> + * @state:		status after decode done
> + * @cur_lst_tile_id:	tile id for large scale
> + */
> +struct vdec_av1_slice_vsi {
> +	/* lat */
> +	struct vdec_av1_slice_mem bs;
> +	struct vdec_av1_slice_work_buffer work_buffer[AV1_MAX_FRAME_BUF_COUNT];
> +	struct vdec_av1_slice_mem cdf_table;
> +	struct vdec_av1_slice_mem cdf_tmp;
> +	/* LAT stage's output, Core stage's input */
> +	struct vdec_av1_slice_mem rd_mv;
> +	struct vdec_av1_slice_mem ube;
> +	struct vdec_av1_slice_mem trans;
> +	struct vdec_av1_slice_mem err_map;
> +	struct vdec_av1_slice_mem row_info;
> +	/* core */
> +	struct vdec_av1_slice_fb fb;
> +	struct vdec_av1_slice_fb ref[V4L2_AV1_REFS_PER_FRAME];
> +	struct vdec_av1_slice_mem iq_table;
> +	/* lat and core share*/
> +	struct vdec_av1_slice_mem tile;
> +	struct vdec_av1_slice_slot slots;
> +	u8 slot_id;
> +	struct vdec_av1_slice_frame frame;
> +	struct vdec_av1_slice_state state;
> +	u32 cur_lst_tile_id;
> +};
> +
> +/**
> + * struct vdec_av1_slice_pfc - per-frame context that contains a local vsi.
> + *                             pass it from lat to core
> + * @vsi:        local vsi. copy to/from remote vsi before/after decoding
> + * @ref_idx:    reference buffer timestamp
> + * @seq:        picture sequence
> + */
> +struct vdec_av1_slice_pfc {
> +	struct vdec_av1_slice_vsi vsi;
> +	u64 ref_idx[V4L2_AV1_REFS_PER_FRAME];
> +	int seq;
> +};
> +
> +/**
> + * struct vdec_av1_slice_instance - represent one av1 instance
> + * @ctx:                pointer to codec's context
> + * @vpu:                VPU instance
> + * @iq_table:           iq table buffer
> + * @cdf_table:          cdf table buffer
> + * @mv:                 mv working buffer
> + * @cdf:                cdf working buffer
> + * @seg:                segmentation working buffer
> + * @cdf_temp:           cdf temp buffer
> + * @tile:               tile buffer
> + * @slots:              slots info
> + * @tile_group:         tile_group entry
> + * @level:              level of current resolution
> + * @width:              width of last picture
> + * @height:             height of last picture
> + * @frame_type:         frame_type of last picture
> + * @irq:                irq to Main CPU or MicroP
> + * @inneracing_mode:    is inneracing mode
> + * @init_vsi:           vsi used for initialized AV1 instance
> + * @vsi:                vsi used for decoding/flush ...
> + * @core_vsi:           vsi used for Core stage
> + * @seq:                global picture sequence
> + */
> +struct vdec_av1_slice_instance {
> +	struct mtk_vcodec_ctx *ctx;
> +	struct vdec_vpu_inst vpu;
> +
> +	struct mtk_vcodec_mem iq_table;
> +	struct mtk_vcodec_mem cdf_table;
> +
> +	struct mtk_vcodec_mem mv[AV1_MAX_FRAME_BUF_COUNT];
> +	struct mtk_vcodec_mem cdf[AV1_MAX_FRAME_BUF_COUNT];
> +	struct mtk_vcodec_mem seg[AV1_MAX_FRAME_BUF_COUNT];
> +	struct mtk_vcodec_mem cdf_temp;
> +	struct mtk_vcodec_mem tile;
> +	struct vdec_av1_slice_slot slots;
> +	struct vdec_av1_slice_tile_group tile_group;
> +
> +	/* for resolution change and get_pic_info */
> +	enum vdec_av1_slice_resolution_level level;
> +	u32 width;
> +	u32 height;
> +
> +	u32 frame_type;
> +	u32 irq;
> +	u32 inneracing_mode;
> +
> +	/* MicroP vsi */
> +	union {
> +		struct vdec_av1_slice_init_vsi *init_vsi;
> +		struct vdec_av1_slice_vsi *vsi;
> +	};
> +	struct vdec_av1_slice_vsi *core_vsi;
> +	int seq;
> +};
> +
> +static int vdec_av1_slice_core_decode(struct vdec_lat_buf *lat_buf);
> +
> +static inline int vdec_av1_slice_get_msb(u32 n)
> +{
> +	if (n == 0)
> +		return 0;
> +	return 31 ^ __builtin_clz(n);
> +}
> +
> +static inline bool vdec_av1_slice_need_scale(u32 ref_width, u32 ref_height,
> +					     u32 this_width, u32 this_height)
> +{
> +	return ((this_width << 1) >= ref_width) &&
> +		((this_height << 1) >= ref_height) &&
> +		(this_width <= (ref_width << 4)) &&
> +		(this_height <= (ref_height << 4));
> +}
> +
> +static void *vdec_av1_get_ctrl_ptr(struct mtk_vcodec_ctx *ctx, int id)
> +{
> +	struct v4l2_ctrl *ctrl = v4l2_ctrl_find(&ctx->ctrl_hdl, id);
> +
> +	if (!ctrl)
> +		return ERR_PTR(-EINVAL);
> +
> +	return ctrl->p_cur.p;
> +}

I see we keep repeating this kind of a v4l2_ctrl_find() wrapper in drivers.
The only reason this code cannot be factored out is the "context" struct pointer
pointing at structs of different types. Maybe we could

#define v4l2_get_ctrl_ptr(ctx, member, id) \
	__v4l2_get_ctrl_ptr((ctx), offsetof(typeof(*ctx), (member)), (id))

void *__v4l2_get_ctrl_ptr(void *ctx, size_t offset, u32 id)
{
	struct v4l2_ctrl_handler *hdl = (struct v4l2_ctrl_handler *)(ctx + offset);
	struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id);

	if (!ctrl)
		return ERR_PTR(-EINVAL);

	return ctrl->p_cur.p;
}

and reuse v4l2_get_ctrl_ptr() in drivers?

A similar kind of void* arithmetic happens in container_of, only with '-'.

> +
> +static int vdec_av1_slice_init_cdf_table(struct vdec_av1_slice_instance *instance)
> +{
> +	u8 *remote_cdf_table;
> +	struct mtk_vcodec_ctx *ctx;
> +	struct vdec_av1_slice_init_vsi *vsi;
> +	int ret;
> +
> +	ctx = instance->ctx;
> +	vsi = instance->vpu.vsi;
> +	if (!ctx || !vsi) {
> +		mtk_vcodec_err(instance, "invalid ctx or vsi 0x%p 0x%p\n",
> +			       ctx, vsi);
> +		return -EINVAL;
> +	}

The above if block is redundant, because - given the current shape of ths driver
code - the condition is never true.

This function is only called from vdec_av1_slice_init(), where both
instance->ctx and instance->vpu.vsi are set to some values. The latter is even
checked for being null before this function is called.

In the caller, instance->ctx is set to whatever the caller receives from its
caller. This perhaps might be checked, but vdec_av1_slice_init() dereferences
ctx without checking anyway (instance->vpu.codec_type = ctx->current_codec;).
So maybe add a check in vdec_av1_slice_init(), or ensure that
vdec_av1_slice_init() is never passed a NULL ctx.

> +
> +	remote_cdf_table = mtk_vcodec_fw_map_dm_addr(ctx->dev->fw_handler,
> +						     (u32)vsi->cdf_table_addr);
> +	if (IS_ERR(remote_cdf_table)) {
> +		mtk_vcodec_err(instance, "failed to map cdf table\n");
> +		return PTR_ERR(remote_cdf_table);
> +	}
> +
> +	mtk_vcodec_debug(instance, "map cdf table to 0x%p\n",
> +			 remote_cdf_table);
> +
> +	if (instance->cdf_table.va)
> +		mtk_vcodec_mem_free(ctx, &instance->cdf_table);
> +	instance->cdf_table.size = vsi->cdf_table_size;
> +
> +	ret = mtk_vcodec_mem_alloc(ctx, &instance->cdf_table);
> +	if (ret)
> +		return ret;
> +
> +	memcpy(instance->cdf_table.va, remote_cdf_table, vsi->cdf_table_size);
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_init_iq_table(struct vdec_av1_slice_instance *instance)
> +{
> +	u8 *remote_iq_table;
> +	struct mtk_vcodec_ctx *ctx;
> +	struct vdec_av1_slice_init_vsi *vsi;
> +	int ret;
> +
> +	ctx = instance->ctx;
> +	vsi = instance->vpu.vsi;
> +	if (!ctx || !vsi) {
> +		mtk_vcodec_err(instance, "invalid ctx or vsi 0x%p 0x%p\n",
> +			       ctx, vsi);
> +		return -EINVAL;
> +	}

ditto

> +
> +	remote_iq_table = mtk_vcodec_fw_map_dm_addr(ctx->dev->fw_handler,
> +						    (u32)vsi->iq_table_addr);
> +	if (IS_ERR(remote_iq_table)) {
> +		mtk_vcodec_err(instance, "failed to map iq table\n");
> +		return PTR_ERR(remote_iq_table);
> +	}
> +
> +	mtk_vcodec_debug(instance, "map iq table to 0x%p\n", remote_iq_table);
> +
> +	if (instance->iq_table.va)
> +		mtk_vcodec_mem_free(ctx, &instance->iq_table);
> +	instance->iq_table.size = vsi->iq_table_size;
> +
> +	ret = mtk_vcodec_mem_alloc(ctx, &instance->iq_table);
> +	if (ret)
> +		return ret;
> +
> +	memcpy(instance->iq_table.va, remote_iq_table, vsi->iq_table_size);
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_get_new_slot(struct vdec_av1_slice_vsi *vsi)
> +{
> +	struct vdec_av1_slice_slot *slots = &vsi->slots;
> +	int new_slot_idx = AV1_INVALID_IDX;
> +	int i;
> +
> +	for (i = 0; i < AV1_MAX_FRAME_BUF_COUNT; i++) {
> +		if (slots->frame_info[i].ref_count == 0) {
> +			new_slot_idx = i;
> +			break;
> +		}
> +	}
> +
> +	if (new_slot_idx != AV1_INVALID_IDX) {
> +		slots->frame_info[new_slot_idx].ref_count++;
> +		slots->timestamp[new_slot_idx] = vsi->frame.cur_ts;
> +	}
> +
> +	return new_slot_idx;
> +}
> +
> +static void vdec_av1_slice_clear_fb(struct vdec_av1_slice_frame_info *frame_info)

static inline void?

> +{
> +	memset((void *)frame_info, 0, sizeof(struct vdec_av1_slice_frame_info));
> +}
> +
> +static void vdec_av1_slice_decrease_ref_count(struct vdec_av1_slice_slot *slots, int fb_idx)
> +{
> +	struct vdec_av1_slice_frame_info *frame_info = slots->frame_info;
> +
> +	if (fb_idx < 0 || fb_idx >= AV1_MAX_FRAME_BUF_COUNT) {
> +		mtk_v4l2_err("av1_error: %s() invalid fb_idx %d\n", __func__, fb_idx);
> +		return;
> +	}

The above if block is redundant, because - given the current shape of this
driver code - the condition is never true.

This function is only called from the below vdec_av1_slice_cleanup_slots().
The fb_idx formal param comes from the caller's slot_id local variable, whose
value is only assigned in the for loop, iterating from 0 to
AV1_MAX_FRAME_BUF_COUNT - 1, inclusive. Hence slot_id is never < 0
nor >= AV1_MAX_FRAME_BUF_COUNT.

> +
> +	frame_info[fb_idx].ref_count--;
> +	if (frame_info[fb_idx].ref_count < 0) {
> +		frame_info[fb_idx].ref_count = 0;
> +		mtk_v4l2_err("av1_error: %s() fb_idx %d decrease ref_count error\n",
> +			     __func__, fb_idx);
> +	}
> +	vdec_av1_slice_clear_fb(&frame_info[fb_idx]);
> +}
> +
> +static void vdec_av1_slice_cleanup_slots(struct vdec_av1_slice_slot *slots,
> +					 struct vdec_av1_slice_frame *frame,
> +					 struct v4l2_ctrl_av1_frame *ctrl_fh)
> +{
> +	int slot_id, ref_id;
> +
> +	for (ref_id = 0; ref_id < V4L2_AV1_TOTAL_REFS_PER_FRAME; ref_id++)
> +		frame->ref_frame_map[ref_id] = AV1_INVALID_IDX;
> +
> +	for (slot_id = 0; slot_id < AV1_MAX_FRAME_BUF_COUNT; slot_id++) {
> +		u64 timestamp = slots->timestamp[slot_id];
> +		bool ref_used = false;
> +
> +		/* ignored unused slots */
> +		if (slots->frame_info[slot_id].ref_count == 0)
> +			continue;
> +
> +		for (ref_id = 0; ref_id < V4L2_AV1_TOTAL_REFS_PER_FRAME; ref_id++) {
> +			if (ctrl_fh->reference_frame_ts[ref_id] == timestamp) {
> +				frame->ref_frame_map[ref_id] = slot_id;
> +				ref_used = true;
> +			}
> +		}
> +
> +		if (!ref_used)
> +			vdec_av1_slice_decrease_ref_count(slots, slot_id);
> +	}
> +}
> +
> +static void vdec_av1_slice_setup_slot(struct vdec_av1_slice_instance *instance,
> +				      struct vdec_av1_slice_vsi *vsi,
> +				      struct v4l2_ctrl_av1_frame *ctrl_fh)
> +{
> +	struct vdec_av1_slice_frame_info *cur_frame_info;
> +	struct vdec_av1_slice_uncompressed_header *uh = &vsi->frame.uh;
> +	int ref_id;
> +
> +	memcpy(&vsi->slots, &instance->slots, sizeof(instance->slots));
> +	vdec_av1_slice_cleanup_slots(&vsi->slots, &vsi->frame, ctrl_fh);
> +	vsi->slot_id = vdec_av1_slice_get_new_slot(vsi);
> +
> +	if (vsi->slot_id == AV1_INVALID_IDX) {
> +		mtk_v4l2_err("warning:av1 get invalid index slot\n");
> +		vsi->slot_id = 0;
> +	}
> +	cur_frame_info = &vsi->slots.frame_info[vsi->slot_id];
> +	cur_frame_info->frame_type = uh->frame_type;
> +	cur_frame_info->frame_is_intra = ((uh->frame_type == AV1_INTRA_ONLY_FRAME) ||
> +					  (uh->frame_type == AV1_KEY_FRAME));
> +	cur_frame_info->order_hint = uh->order_hint;
> +	cur_frame_info->upscaled_width = uh->upscaled_width;
> +	cur_frame_info->pic_pitch = 0;
> +	cur_frame_info->frame_width = uh->frame_width;
> +	cur_frame_info->frame_height = uh->frame_height;
> +	cur_frame_info->mi_cols = ((uh->frame_width + 7) >> 3) << 1;
> +	cur_frame_info->mi_rows = ((uh->frame_height + 7) >> 3) << 1;
> +
> +	/* ensure current frame is properly mapped if referenced */
> +	for (ref_id = 0; ref_id < V4L2_AV1_TOTAL_REFS_PER_FRAME; ref_id++) {
> +		u64 timestamp = vsi->slots.timestamp[vsi->slot_id];
> +
> +		if (ctrl_fh->reference_frame_ts[ref_id] == timestamp)
> +			vsi->frame.ref_frame_map[ref_id] = vsi->slot_id;
> +	}
> +}
> +
> +static int vdec_av1_slice_alloc_working_buffer(struct vdec_av1_slice_instance *instance,
> +					       struct vdec_av1_slice_vsi *vsi)
> +{
> +	struct mtk_vcodec_ctx *ctx = instance->ctx;
> +	struct vdec_av1_slice_work_buffer *work_buffer = vsi->work_buffer;
> +	enum vdec_av1_slice_resolution_level level;
> +	u32 max_sb_w, max_sb_h, max_w, max_h, w, h;
> +	size_t size;
> +	int i, ret;
> +
> +	w = vsi->frame.uh.frame_width;
> +	h = vsi->frame.uh.frame_height;
> +
> +	if (w > VCODEC_DEC_4K_CODED_WIDTH || h > VCODEC_DEC_4K_CODED_HEIGHT)
> +		/* 8K */
> +		return -EINVAL;
> +
> +	if (w > MTK_VDEC_MAX_W || h > MTK_VDEC_MAX_H) {
> +		/* 4K */
> +		level = AV1_RES_4K;
> +		max_w = VCODEC_DEC_4K_CODED_WIDTH;
> +		max_h = VCODEC_DEC_4K_CODED_HEIGHT;
> +	} else {
> +		/* FHD */
> +		level = AV1_RES_FHD;
> +		max_w = MTK_VDEC_MAX_W;
> +		max_h = MTK_VDEC_MAX_H;
> +	}
> +
> +	if (level == instance->level)
> +		return 0;
> +
> +	mtk_vcodec_debug(instance, "resolution level changed from %u to %u, %ux%u",
> +			 instance->level, level, w, h);
> +
> +	max_sb_w = DIV_ROUND_UP(max_w, 128);
> +	max_sb_h = DIV_ROUND_UP(max_h, 128);
> +	size = max_sb_w * max_sb_h * SZ_1K;
> +	for (i = 0; i < AV1_MAX_FRAME_BUF_COUNT; i++) {
> +		if (instance->mv[i].va)
> +			mtk_vcodec_mem_free(ctx, &instance->mv[i]);
> +		instance->mv[i].size = size;
> +		ret = mtk_vcodec_mem_alloc(ctx, &instance->mv[i]);
> +		if (ret)
> +			goto err;

Please ignore this comment if this has been discussed and settled.
Maybe it's just me, but I feel it is idiomatic in the kernel to
undo all previous allocations if at some iteration we fail. Here a different
approach is taken: we stop iterating and return an error, and free next time
we are called. Why?

> +		work_buffer[i].mv_addr.buf = instance->mv[i].dma_addr;
> +		work_buffer[i].mv_addr.size = size; > +	}
> +
> +	size = max_sb_w * max_sb_h * 512;
> +	for (i = 0; i < AV1_MAX_FRAME_BUF_COUNT; i++) {
> +		if (instance->seg[i].va)
> +			mtk_vcodec_mem_free(ctx, &instance->seg[i]);
> +		instance->seg[i].size = size;
> +		ret = mtk_vcodec_mem_alloc(ctx, &instance->seg[i]);
> +		if (ret)
> +			goto err;
> +		work_buffer[i].segid_addr.buf = instance->seg[i].dma_addr;
> +		work_buffer[i].segid_addr.size = size;
> +	}
> +
> +	size = 16384;

#define a named constant for this magic number?

> +	for (i = 0; i < AV1_MAX_FRAME_BUF_COUNT; i++) {
> +		if (instance->cdf[i].va)
> +			mtk_vcodec_mem_free(ctx, &instance->cdf[i]);
> +		instance->cdf[i].size = size;
> +		ret = mtk_vcodec_mem_alloc(ctx, &instance->cdf[i]);
> +		if (ret)
> +			goto err;
> +		work_buffer[i].cdf_addr.buf = instance->cdf[i].dma_addr;
> +		work_buffer[i].cdf_addr.size = size;
> +	}

The 3 for loops are supposed to iterate from 0 to AV1_MAX_FRAME_BUF_COUNT - 1,
inclusive. Is it possible to merge them?

> +	if (!instance->cdf_temp.va) {
> +		instance->cdf_temp.size = (SZ_1K * 16 * 100);
> +		ret = mtk_vcodec_mem_alloc(ctx, &instance->cdf_temp);
> +		if (ret)
> +			goto err;
> +		vsi->cdf_tmp.buf = instance->cdf_temp.dma_addr;
> +		vsi->cdf_tmp.size = instance->cdf_temp.size;
> +	}
> +	size = AV1_TILE_BUF_SIZE * V4L2_AV1_MAX_TILE_COUNT;

This "size" is never changed until the end of this function.
It is a compile-time constant, so there's no need to assign its
value to an intermediate variable.

> +
> +	if (instance->tile.va)
> +		mtk_vcodec_mem_free(ctx, &instance->tile);
> +	instance->tile.size = size;

instance->tile.size = AV1_TILE_BUF_SIZE * V4L2_AV1_MAX_TILE_COUNT;

> +
> +	ret = mtk_vcodec_mem_alloc(ctx, &instance->tile);
> +	if (ret)
> +		goto err;
> +
> +	vsi->tile.buf = instance->tile.dma_addr;
> +	vsi->tile.size = size;

vsi->tile.size = instance->tile.size;

and now it is clear the size in vsi is the same as the one in instance.
BTW, is vsi->tile.size supposed to always be equal to the one in instance?
If yes:
  - Is instance available whenever we need to access vsi->tile.size?
  - What's the point of duplicating this value? Can it be stored in one place?

> +
> +	instance->level = level;
> +	return 0;
> +
> +err:
> +	instance->level = AV1_RES_NONE;
> +	return ret;
> +}
> +
> +static void vdec_av1_slice_free_working_buffer(struct vdec_av1_slice_instance *instance)
> +{
> +	struct mtk_vcodec_ctx *ctx = instance->ctx;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(instance->mv); i++)
> +		if (instance->mv[i].va)
> +			mtk_vcodec_mem_free(ctx, &instance->mv[i]);

Perhaps mtk_vcodec_mem_free() can properly handle the case

(!instance->mv[i].va) ? This would eliminate 7 of 20 lines of code
in this function.

> +
> +	for (i = 0; i < ARRAY_SIZE(instance->seg); i++)
> +		if (instance->seg[i].va)
> +			mtk_vcodec_mem_free(ctx, &instance->seg[i]);
> +
> +	for (i = 0; i < ARRAY_SIZE(instance->cdf); i++)
> +		if (instance->cdf[i].va)
> +			mtk_vcodec_mem_free(ctx, &instance->cdf[i]);
> +
> +	if (instance->tile.va)
> +		mtk_vcodec_mem_free(ctx, &instance->tile);
> +	if (instance->cdf_temp.va)
> +		mtk_vcodec_mem_free(ctx, &instance->cdf_temp);
> +	if (instance->cdf_table.va)
> +		mtk_vcodec_mem_free(ctx, &instance->cdf_table);
> +	if (instance->iq_table.va)
> +		mtk_vcodec_mem_free(ctx, &instance->iq_table);
> +
> +	instance->level = AV1_RES_NONE;
> +}
> +
> +static void vdec_av1_slice_vsi_from_remote(struct vdec_av1_slice_vsi *vsi,
> +					   struct vdec_av1_slice_vsi *remote_vsi)

static inline void?

> +{
> +	memcpy(&vsi->trans, &remote_vsi->trans, sizeof(vsi->trans));
> +	memcpy(&vsi->state, &remote_vsi->state, sizeof(vsi->state));
> +}
> +
> +static void vdec_av1_slice_vsi_to_remote(struct vdec_av1_slice_vsi *vsi,
> +					 struct vdec_av1_slice_vsi *remote_vsi)

static inline void?

> +{
> +	memcpy(remote_vsi, vsi, sizeof(*vsi));
> +}
> +
> +static int vdec_av1_slice_setup_lat_from_src_buf(struct vdec_av1_slice_instance *instance,
> +						 struct vdec_av1_slice_vsi *vsi,
> +						 struct vdec_lat_buf *lat_buf)
> +{
> +	struct vb2_v4l2_buffer *src;
> +	struct vb2_v4l2_buffer *dst;
> +
> +	src = v4l2_m2m_next_src_buf(instance->ctx->m2m_ctx);
> +	if (!src)
> +		return -EINVAL;
> +
> +	lat_buf->src_buf_req = src->vb2_buf.req_obj.req;
> +	dst = &lat_buf->ts_info;

the "ts_info" actually contains a struct vb2_v4l2_buffer. Why such a name?

> +	v4l2_m2m_buf_copy_metadata(src, dst, true);
> +	vsi->frame.cur_ts = dst->vb2_buf.timestamp;
> +
> +	return 0;
> +}
> +
> +static short vdec_av1_slice_resolve_divisor_32(u32 D, short *shift)
> +{
> +	int f;
> +	int e;
> +
> +	*shift = vdec_av1_slice_get_msb(D);
> +	/* e is obtained from D after resetting the most significant 1 bit. */
> +	e = D - ((u32)1 << *shift);
> +	/* Get the most significant DIV_LUT_BITS (8) bits of e into f */
> +	if (*shift > DIV_LUT_BITS)
> +		f = AV1_DIV_ROUND_UP_POW2(e, *shift - DIV_LUT_BITS);
> +	else
> +		f = e << (DIV_LUT_BITS - *shift);
> +	if (f > DIV_LUT_NUM)
> +		return -1;
> +	*shift += DIV_LUT_PREC_BITS;
> +	/* Use f as lookup into the precomputed table of multipliers */
> +	return div_lut[f];
> +}
> +
> +static void vdec_av1_slice_get_shear_params(struct vdec_av1_slice_gm *gm_params)
> +{
> +	const int *mat = gm_params->wmmat;
> +	short shift;
> +	short y;
> +	long long gv, dv;
> +
> +	if (gm_params->wmmat[2] <= 0)
> +		return;
> +
> +	gm_params->alpha = clamp_val(mat[2] - (1 << WARPEDMODEL_PREC_BITS), S16_MIN, S16_MAX);
> +	gm_params->beta = clamp_val(mat[3], S16_MIN, S16_MAX);
> +
> +	y = vdec_av1_slice_resolve_divisor_32(abs(mat[2]), &shift) * (mat[2] < 0 ? -1 : 1);
> +
> +	gv = ((long long)mat[4] * (1 << WARPEDMODEL_PREC_BITS)) * y;
> +	gm_params->gamma = clamp_val((int)AV1_DIV_ROUND_UP_POW2_SIGNED(gv, shift),
> +				     S16_MIN, S16_MAX);
> +
> +	dv = ((long long)mat[3] * mat[4]) * y;
> +	gm_params->delta = clamp_val(mat[5] - (int)AV1_DIV_ROUND_UP_POW2_SIGNED(dv, shift) -
> +				     (1 << WARPEDMODEL_PREC_BITS), S16_MIN, S16_MAX);
> +
> +	gm_params->alpha = AV1_DIV_ROUND_UP_POW2_SIGNED(gm_params->alpha, WARP_PARAM_REDUCE_BITS) *
> +							(1 << WARP_PARAM_REDUCE_BITS);
> +	gm_params->beta = AV1_DIV_ROUND_UP_POW2_SIGNED(gm_params->beta, WARP_PARAM_REDUCE_BITS) *
> +						       (1 << WARP_PARAM_REDUCE_BITS);
> +	gm_params->gamma = AV1_DIV_ROUND_UP_POW2_SIGNED(gm_params->gamma, WARP_PARAM_REDUCE_BITS) *
> +							(1 << WARP_PARAM_REDUCE_BITS);
> +	gm_params->delta = AV1_DIV_ROUND_UP_POW2_SIGNED(gm_params->delta, WARP_PARAM_REDUCE_BITS) *
> +							(1 << WARP_PARAM_REDUCE_BITS);
> +}
> +
> +static void vdec_av1_slice_setup_gm(struct vdec_av1_slice_gm *gm,
> +				    struct v4l2_av1_global_motion *ctrl_gm)
> +{
> +	u32 i, j;
> +
> +	for (i = 0; i < V4L2_AV1_TOTAL_REFS_PER_FRAME; i++) {
> +		gm[i].wmtype = ctrl_gm->type[i];
> +		for (j = 0; j < 6; j++)

Maybe #define this magic 6?

> +			gm[i].wmmat[j] = ctrl_gm->params[i][j];
> +
> +		gm[i].invalid = !!(ctrl_gm->invalid & BIT(i));
> +		gm[i].alpha = 0;
> +		gm[i].beta = 0;
> +		gm[i].gamma = 0;
> +		gm[i].delta = 0;
> +		if (gm[i].wmtype <= 3)

And this 3?

> +			vdec_av1_slice_get_shear_params(&gm[i]);
> +	}
> +}
> +
> +static void vdec_av1_slice_setup_seg(struct vdec_av1_slice_seg *seg,
> +				     struct v4l2_av1_segmentation *ctrl_seg)
> +{
> +	u32 i, j;
> +
> +	seg->segmentation_enabled = SEGMENTATION_FLAG(ctrl_seg, ENABLED);
> +	seg->segmentation_update_map = SEGMENTATION_FLAG(ctrl_seg, UPDATE_MAP);
> +	seg->segmentation_temporal_update = SEGMENTATION_FLAG(ctrl_seg, TEMPORAL_UPDATE);
> +	seg->segmentation_update_data = SEGMENTATION_FLAG(ctrl_seg, UPDATE_DATA);
> +	seg->segid_preskip = SEGMENTATION_FLAG(ctrl_seg, SEG_ID_PRE_SKIP);
> +	seg->last_active_segid = ctrl_seg->last_active_seg_id;
> +
> +	for (i = 0; i < V4L2_AV1_MAX_SEGMENTS; i++) {
> +		seg->feature_enabled_mask[i] = ctrl_seg->feature_enabled[i];
> +		for (j = 0; j < V4L2_AV1_SEG_LVL_MAX; j++)
> +			seg->feature_data[i][j] = ctrl_seg->feature_data[i][j];
> +	}
> +}
> +
> +static void vdec_av1_slice_setup_quant(struct vdec_av1_slice_quantization *quant,
> +				       struct v4l2_av1_quantization *ctrl_quant)
> +{
> +	quant->base_q_idx = ctrl_quant->base_q_idx;
> +	quant->delta_qydc = ctrl_quant->delta_q_y_dc;
> +	quant->delta_qudc = ctrl_quant->delta_q_u_dc;
> +	quant->delta_quac = ctrl_quant->delta_q_u_ac;
> +	quant->delta_qvdc = ctrl_quant->delta_q_v_dc;
> +	quant->delta_qvac = ctrl_quant->delta_q_v_ac;
> +	quant->qm_y = ctrl_quant->qm_y;
> +	quant->qm_u = ctrl_quant->qm_u;
> +	quant->qm_v = ctrl_quant->qm_v;

Can a common struct be introduced to hold these parameters?
And then copied in one go?

Maybe there's a good reason the code is the way it is now. However,
a series of "dumb" assignments (no value modifications) makes me wonder.

> +	quant->using_qmatrix = QUANT_FLAG(ctrl_quant, USING_QMATRIX);
> +}
> +
> +static int vdec_av1_slice_get_qindex(struct vdec_av1_slice_uncompressed_header *uh,
> +				     int segmentation_id)
> +{
> +	struct vdec_av1_slice_seg *seg = &uh->seg;
> +	struct vdec_av1_slice_quantization *quant = &uh->quant;
> +	int data = 0, qindex = 0;
> +
> +	if (seg->segmentation_enabled &&
> +	    (seg->feature_enabled_mask[segmentation_id] & BIT(SEG_LVL_ALT_Q))) {
> +		data = seg->feature_data[segmentation_id][SEG_LVL_ALT_Q];
> +		qindex = quant->base_q_idx + data;
> +		return clamp_val(qindex, 0, MAXQ);
> +	}
> +
> +	return quant->base_q_idx;
> +}
> +
> +static void vdec_av1_slice_setup_lr(struct vdec_av1_slice_lr *lr,
> +				    struct v4l2_av1_loop_restoration  *ctrl_lr)
> +{
> +	int i;
> +
> +	lr->use_lr = 0;
> +	lr->use_chroma_lr = 0;
> +	for (i = 0; i < V4L2_AV1_NUM_PLANES_MAX; i++) {
> +		lr->frame_restoration_type[i] = ctrl_lr->frame_restoration_type[i];
> +		lr->loop_restoration_size[i] = ctrl_lr->loop_restoration_size[i];
> +		if (lr->frame_restoration_type[i]) {
> +			lr->use_lr = 1;
> +			if (i > 0)
> +				lr->use_chroma_lr = 1;
> +		}
> +	}
> +}
> +
> +static void vdec_av1_slice_setup_lf(struct vdec_av1_slice_loop_filter *lf,
> +				    struct v4l2_av1_loop_filter *ctrl_lf)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(lf->loop_filter_level); i++)
> +		lf->loop_filter_level[i] = ctrl_lf->level[i];
> +
> +	for (i = 0; i < V4L2_AV1_TOTAL_REFS_PER_FRAME; i++)
> +		lf->loop_filter_ref_deltas[i] = ctrl_lf->ref_deltas[i];
> +
> +	for (i = 0; i < ARRAY_SIZE(lf->loop_filter_mode_deltas); i++)
> +		lf->loop_filter_mode_deltas[i] = ctrl_lf->mode_deltas[i];
> +
> +	lf->loop_filter_sharpness = ctrl_lf->sharpness;
> +	lf->loop_filter_delta_enabled =
> +		   BIT_FLAG(ctrl_lf, V4L2_AV1_LOOP_FILTER_FLAG_DELTA_ENABLED);
> +}
> +
> +static void vdec_av1_slice_setup_cdef(struct vdec_av1_slice_cdef *cdef,
> +				      struct v4l2_av1_cdef *ctrl_cdef)
> +{
> +	int i;
> +
> +	cdef->cdef_damping = ctrl_cdef->damping_minus_3 + 3;
> +	cdef->cdef_bits = ctrl_cdef->bits;
> +
> +	for (i = 0; i < V4L2_AV1_CDEF_MAX; i++) {
> +		if (ctrl_cdef->y_sec_strength[i] == 4)
> +			ctrl_cdef->y_sec_strength[i] -= 1;
> +
> +		if (ctrl_cdef->uv_sec_strength[i] == 4)
> +			ctrl_cdef->uv_sec_strength[i] -= 1;
> +
> +		cdef->cdef_y_strength[i] =
> +			ctrl_cdef->y_pri_strength[i] << SECONDARY_FILTER_STRENGTH_NUM_BITS |
> +			ctrl_cdef->y_sec_strength[i];
> +		cdef->cdef_uv_strength[i] =
> +			ctrl_cdef->uv_pri_strength[i] << SECONDARY_FILTER_STRENGTH_NUM_BITS |
> +			ctrl_cdef->uv_sec_strength[i];
> +	}
> +}

Both vdec_av1_slice_setup_lf() and vdec_av1_slice_setup_cdef():

I'm wondering if the user of struct vdec_av1_slice_loop_filter and struct 
vdec_av1_slice_cdef could work with the uAPI variants of these structs? Is there
a need for driver-specific mutations? (Maybe there is, the driver's author
should know).

> +
> +static void vdec_av1_slice_setup_seq(struct vdec_av1_slice_seq_header *seq,
> +				     struct v4l2_ctrl_av1_sequence *ctrl_seq)
> +{
> +	seq->bitdepth = ctrl_seq->bit_depth;
> +	seq->max_frame_width = ctrl_seq->max_frame_width_minus_1 + 1;
> +	seq->max_frame_height = ctrl_seq->max_frame_height_minus_1 + 1;
> +	seq->enable_superres = SEQUENCE_FLAG(ctrl_seq, ENABLE_SUPERRES);
> +	seq->enable_filter_intra = SEQUENCE_FLAG(ctrl_seq, ENABLE_FILTER_INTRA);
> +	seq->enable_intra_edge_filter = SEQUENCE_FLAG(ctrl_seq, ENABLE_INTRA_EDGE_FILTER);
> +	seq->enable_interintra_compound = SEQUENCE_FLAG(ctrl_seq, ENABLE_INTERINTRA_COMPOUND);
> +	seq->enable_masked_compound = SEQUENCE_FLAG(ctrl_seq, ENABLE_MASKED_COMPOUND);
> +	seq->enable_dual_filter = SEQUENCE_FLAG(ctrl_seq, ENABLE_DUAL_FILTER);
> +	seq->enable_jnt_comp = SEQUENCE_FLAG(ctrl_seq, ENABLE_JNT_COMP);
> +	seq->mono_chrome = SEQUENCE_FLAG(ctrl_seq, MONO_CHROME);
> +	seq->enable_order_hint = SEQUENCE_FLAG(ctrl_seq, ENABLE_ORDER_HINT);
> +	seq->order_hint_bits = ctrl_seq->order_hint_bits;
> +	seq->use_128x128_superblock = SEQUENCE_FLAG(ctrl_seq, USE_128X128_SUPERBLOCK);
> +	seq->subsampling_x = SEQUENCE_FLAG(ctrl_seq, SUBSAMPLING_X);
> +	seq->subsampling_y = SEQUENCE_FLAG(ctrl_seq, SUBSAMPLING_Y);
> +}
> +
> +static void vdec_av1_slice_setup_tile(struct vdec_av1_slice_frame *frame,
> +				      struct v4l2_av1_tile_info *ctrl_tile)
> +{
> +	struct vdec_av1_slice_seq_header *seq = &frame->seq;
> +	struct vdec_av1_slice_tile *tile = &frame->uh.tile;
> +	u32 mib_size_log2 = seq->use_128x128_superblock ? 5 : 4;
> +	int i;
> +
> +	tile->tile_cols = ctrl_tile->tile_cols;
> +	tile->tile_rows = ctrl_tile->tile_rows;
> +	tile->context_update_tile_id = ctrl_tile->context_update_tile_id;
> +	tile->uniform_tile_spacing_flag =
> +		BIT_FLAG(ctrl_tile, V4L2_AV1_TILE_INFO_FLAG_UNIFORM_TILE_SPACING);
> +
> +	for (i = 0; i < tile->tile_cols + 1; i++)
> +		tile->mi_col_starts[i] =
> +			ALIGN(ctrl_tile->mi_col_starts[i], BIT(mib_size_log2)) >> mib_size_log2;
> +
> +	for (i = 0; i < tile->tile_rows + 1; i++)
> +		tile->mi_row_starts[i] =
> +			ALIGN(ctrl_tile->mi_row_starts[i], BIT(mib_size_log2)) >> mib_size_log2;
> +}
> +
> +static void vdec_av1_slice_setup_uh(struct vdec_av1_slice_instance *instance,
> +				    struct vdec_av1_slice_frame *frame,
> +				    struct v4l2_ctrl_av1_frame *ctrl_fh)
> +{
> +	struct vdec_av1_slice_uncompressed_header *uh = &frame->uh;
> +	int i;
> +
> +	uh->use_ref_frame_mvs = FH_FLAG(ctrl_fh, USE_REF_FRAME_MVS);
> +	uh->order_hint = ctrl_fh->order_hint;
> +	vdec_av1_slice_setup_gm(uh->gm, &ctrl_fh->global_motion);
> +	uh->upscaled_width = ctrl_fh->upscaled_width;
> +	uh->frame_width = ctrl_fh->frame_width_minus_1 + 1;
> +	uh->frame_height = ctrl_fh->frame_height_minus_1 + 1;
> +	uh->mi_cols = ((uh->frame_width + 7) >> 3) << 1;
> +	uh->mi_rows = ((uh->frame_height + 7) >> 3) << 1;
> +	uh->reduced_tx_set = FH_FLAG(ctrl_fh, REDUCED_TX_SET);
> +	uh->tx_mode = ctrl_fh->tx_mode;
> +	uh->uniform_tile_spacing_flag = FH_FLAG(ctrl_fh, UNIFORM_TILE_SPACING);
> +	uh->interpolation_filter = ctrl_fh->interpolation_filter;
> +	uh->allow_warped_motion = FH_FLAG(ctrl_fh, ALLOW_WARPED_MOTION);
> +	uh->is_motion_mode_switchable = FH_FLAG(ctrl_fh, IS_MOTION_MODE_SWITCHABLE);
> +	uh->frame_type = ctrl_fh->frame_type;
> +	uh->frame_is_intra = (uh->frame_type == V4L2_AV1_INTRA_ONLY_FRAME ||
> +			      uh->frame_type == V4L2_AV1_KEY_FRAME);
> +
> +	if (!uh->frame_is_intra && FH_FLAG(ctrl_fh, REFERENCE_SELECT))
> +		uh->reference_mode = AV1_REFERENCE_MODE_SELECT;
> +	else
> +		uh->reference_mode = AV1_SINGLE_REFERENCE;
> +
> +	uh->allow_high_precision_mv = FH_FLAG(ctrl_fh, ALLOW_HIGH_PRECISION_MV);
> +	uh->allow_intra_bc = FH_FLAG(ctrl_fh, ALLOW_INTRABC);
> +	uh->force_integer_mv = FH_FLAG(ctrl_fh, FORCE_INTEGER_MV);
> +	uh->allow_screen_content_tools = FH_FLAG(ctrl_fh, ALLOW_SCREEN_CONTENT_TOOLS);
> +	uh->error_resilient_mode = FH_FLAG(ctrl_fh, ERROR_RESILIENT_MODE);
> +	uh->primary_ref_frame = ctrl_fh->primary_ref_frame;
> +	uh->disable_frame_end_update_cdf =
> +			FH_FLAG(ctrl_fh, DISABLE_FRAME_END_UPDATE_CDF);
> +	uh->disable_cdf_update = FH_FLAG(ctrl_fh, DISABLE_CDF_UPDATE);
> +	uh->skip_mode.skip_mode_present = FH_FLAG(ctrl_fh, SKIP_MODE_PRESENT);
> +	uh->skip_mode.skip_mode_frame[0] =
> +		ctrl_fh->skip_mode_frame[0] - V4L2_AV1_REF_LAST_FRAME;
> +	uh->skip_mode.skip_mode_frame[1] =
> +		ctrl_fh->skip_mode_frame[1] - V4L2_AV1_REF_LAST_FRAME;
> +	uh->skip_mode.skip_mode_allowed = ctrl_fh->skip_mode_frame[0] ? 1 : 0;
> +
> +	vdec_av1_slice_setup_seg(&uh->seg, &ctrl_fh->segmentation);
> +	uh->delta_q_lf.delta_q_present = QUANT_FLAG(&ctrl_fh->quantization, DELTA_Q_PRESENT);
> +	uh->delta_q_lf.delta_q_res = 1 << ctrl_fh->quantization.delta_q_res;
> +	uh->delta_q_lf.delta_lf_present =
> +		BIT_FLAG(&ctrl_fh->loop_filter, V4L2_AV1_LOOP_FILTER_FLAG_DELTA_LF_PRESENT);
> +	uh->delta_q_lf.delta_lf_res = ctrl_fh->loop_filter.delta_lf_res;
> +	uh->delta_q_lf.delta_lf_multi =
> +		BIT_FLAG(&ctrl_fh->loop_filter, V4L2_AV1_LOOP_FILTER_FLAG_DELTA_LF_MULTI);
> +	vdec_av1_slice_setup_quant(&uh->quant, &ctrl_fh->quantization);
> +
> +	uh->coded_loss_less = 1;
> +	for (i = 0; i < V4L2_AV1_MAX_SEGMENTS; i++) {
> +		uh->quant.qindex[i] = vdec_av1_slice_get_qindex(uh, i);
> +		uh->loss_less_array[i] =
> +			(uh->quant.qindex[i] == 0 && uh->quant.delta_qydc == 0 &&
> +			uh->quant.delta_quac == 0 && uh->quant.delta_qudc == 0 &&
> +			uh->quant.delta_qvac == 0 && uh->quant.delta_qvdc == 0);
> +
> +		if (!uh->loss_less_array[i])
> +			uh->coded_loss_less = 0;
> +	}
> +
> +	vdec_av1_slice_setup_lr(&uh->lr, &ctrl_fh->loop_restoration);
> +	uh->superres_denom = ctrl_fh->superres_denom;
> +	vdec_av1_slice_setup_lf(&uh->loop_filter, &ctrl_fh->loop_filter);
> +	vdec_av1_slice_setup_cdef(&uh->cdef, &ctrl_fh->cdef);
> +	vdec_av1_slice_setup_tile(frame, &ctrl_fh->tile_info);
> +}
> +
> +static int vdec_av1_slice_setup_tile_group(struct vdec_av1_slice_instance *instance,
> +					   struct vdec_av1_slice_vsi *vsi)
> +{
> +	struct v4l2_ctrl_av1_tile_group_entry *ctrl_tge;
> +	struct vdec_av1_slice_tile_group *tile_group = &instance->tile_group;
> +	struct vdec_av1_slice_uncompressed_header *uh = &vsi->frame.uh;
> +	struct vdec_av1_slice_tile *tile = &uh->tile;
> +	struct v4l2_ctrl *ctrl;
> +	u32 tge_size;
> +	int i;
> +
> +	ctrl = v4l2_ctrl_find(&instance->ctx->ctrl_hdl, V4L2_CID_STATELESS_AV1_TILE_GROUP_ENTRY);
> +	if (!ctrl)
> +		return -EINVAL;
> +
> +	tge_size = ctrl->elems;
> +	ctrl_tge = (struct v4l2_ctrl_av1_tile_group_entry *)ctrl->p_cur.p;
> +
> +	tile_group->num_tiles = tile->tile_cols * tile->tile_rows;
> +
> +	if (tile_group->num_tiles != tge_size ||
> +	    tile_group->num_tiles > V4L2_AV1_MAX_TILE_COUNT) {
> +		mtk_vcodec_err(instance, "invalid tge_size %d, tile_num:%d\n",
> +			       tge_size, tile_group->num_tiles);
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < tge_size; i++) {
> +		if (i != ctrl_tge[i].tile_row * vsi->frame.uh.tile.tile_cols +
> +		    ctrl_tge[i].tile_col) {
> +			mtk_vcodec_err(instance, "invalid tge info %d, %d %d %d\n",
> +				       i, ctrl_tge[i].tile_row, ctrl_tge[i].tile_col,
> +				       vsi->frame.uh.tile.tile_rows);
> +			return -EINVAL;
> +		}
> +		tile_group->tile_size[i] = ctrl_tge[i].tile_size;
> +		tile_group->tile_start_offset[i] = ctrl_tge[i].tile_offset;
> +	}
> +
> +	return 0;
> +}
> +
> +static void vdec_av1_slice_setup_state(struct vdec_av1_slice_vsi *vsi)

static inline void?

> +{
> +	memset(&vsi->state, 0, sizeof(vsi->state));
> +}
> +
> +static void vdec_av1_slice_setup_scale_factors(struct vdec_av1_slice_frame_refs *frame_ref,
> +					       struct vdec_av1_slice_frame_info *ref_frame_info,
> +					       struct vdec_av1_slice_uncompressed_header *uh)
> +{
> +	struct vdec_av1_slice_scale_factors *scale_factors = &frame_ref->scale_factors;
> +	u32 ref_upscaled_width = ref_frame_info->upscaled_width;
> +	u32 ref_frame_height = ref_frame_info->frame_height;
> +	u32 frame_width = uh->frame_width;
> +	u32 frame_height = uh->frame_height;
> +
> +	if (!vdec_av1_slice_need_scale(ref_upscaled_width, ref_frame_height,
> +				       frame_width, frame_height)) {
> +		scale_factors->x_scale = -1;
> +		scale_factors->y_scale = -1;
> +		scale_factors->is_scaled = 0;
> +		return;
> +	}
> +
> +	scale_factors->x_scale =
> +		((ref_upscaled_width << AV1_REF_SCALE_SHIFT) + (frame_width >> 1)) / frame_width;
> +	scale_factors->y_scale =
> +		((ref_frame_height << AV1_REF_SCALE_SHIFT) + (frame_height >> 1)) / frame_height;
> +	scale_factors->is_scaled =
> +		(scale_factors->x_scale != AV1_REF_INVALID_SCALE) &&
> +		(scale_factors->y_scale != AV1_REF_INVALID_SCALE) &&
> +		(scale_factors->x_scale != AV1_REF_NO_SCALE ||
> +		 scale_factors->y_scale != AV1_REF_NO_SCALE);
> +	scale_factors->x_step =
> +		AV1_DIV_ROUND_UP_POW2(scale_factors->x_scale,
> +				      AV1_REF_SCALE_SHIFT - AV1_SCALE_SUBPEL_BITS);
> +	scale_factors->y_step =
> +		AV1_DIV_ROUND_UP_POW2(scale_factors->y_scale,
> +				      AV1_REF_SCALE_SHIFT - AV1_SCALE_SUBPEL_BITS);
> +}
> +
> +static int vdec_av1_slice_get_relative_dist(int a, int b, u8 enable_order_hint, u8 order_hint_bits)
> +{
> +	int diff = 0;
> +	int m = 0;
> +
> +	if (!enable_order_hint)
> +		return 0;
> +
> +	diff = a - b;
> +	m = 1 << (order_hint_bits - 1);
> +	diff = (diff & (m - 1)) - (diff & m);
> +
> +	return diff;
> +}

This function is called in one place only, and its result needs to be
interpreted at call site. Can it return the result in a form expected
at call site...

> +
> +static void vdec_av1_slice_setup_ref(struct vdec_av1_slice_pfc *pfc,
> +				     struct v4l2_ctrl_av1_frame *ctrl_fh)
> +{
> +	struct vdec_av1_slice_vsi *vsi = &pfc->vsi;
> +	struct vdec_av1_slice_frame *frame = &vsi->frame;
> +	struct vdec_av1_slice_slot *slots = &vsi->slots;
> +	struct vdec_av1_slice_uncompressed_header *uh = &frame->uh;
> +	struct vdec_av1_slice_seq_header *seq = &frame->seq;
> +	struct vdec_av1_slice_frame_info *cur_frame_info =
> +		&slots->frame_info[vsi->slot_id];
> +	struct vdec_av1_slice_frame_info *frame_info;
> +	int i, slot_id;
> +
> +	if (uh->frame_is_intra)
> +		return;
> +
> +	for (i = 0; i < V4L2_AV1_REFS_PER_FRAME; i++) {
> +		int ref_idx = ctrl_fh->ref_frame_idx[i];
> +
> +		pfc->ref_idx[i] = ctrl_fh->reference_frame_ts[ref_idx];
> +		slot_id = frame->ref_frame_map[ref_idx];
> +		frame_info = &slots->frame_info[slot_id];
> +		if (slot_id == AV1_INVALID_IDX) {
> +			mtk_v4l2_err("cannot match reference[%d] 0x%llx\n", i,
> +				     ctrl_fh->reference_frame_ts[ref_idx]);
> +			frame->order_hints[i] = 0;
> +			frame->ref_frame_valid[i] = 0;
> +			continue;
> +		}
> +
> +		frame->frame_refs[i].ref_fb_idx = slot_id;
> +		vdec_av1_slice_setup_scale_factors(&frame->frame_refs[i],
> +						   frame_info, uh);
> +		if (!seq->enable_order_hint)
> +			frame->ref_frame_sign_bias[i + 1] = 0;
> +		else
> +			frame->ref_frame_sign_bias[i + 1] =
> +				vdec_av1_slice_get_relative_dist(frame_info->order_hint,
> +								 uh->order_hint,
> +								 seq->enable_order_hint,
> +								 seq->order_hint_bits)
> +				<= 0 ? 0 : 1;

... to get rid of this tri-argument operator altogether?

> +
> +		frame->order_hints[i] = ctrl_fh->order_hints[i + 1];
> +		cur_frame_info->order_hints[i] = frame->order_hints[i];
> +		frame->ref_frame_valid[i] = 1;
> +	}
> +}
> +
> +static void vdec_av1_slice_get_previous(struct vdec_av1_slice_vsi *vsi)
> +{
> +	struct vdec_av1_slice_frame *frame = &vsi->frame;
> +
> +	if (frame->uh.primary_ref_frame == 7)

#define magic number 7?

> +		frame->prev_fb_idx = AV1_INVALID_IDX;
> +	else
> +		frame->prev_fb_idx = frame->frame_refs[frame->uh.primary_ref_frame].ref_fb_idx;
> +}
> +
> +static void vdec_av1_slice_setup_operating_mode(struct vdec_av1_slice_instance *instance,
> +						struct vdec_av1_slice_frame *frame)

static inline void?

> +{
> +	frame->large_scale_tile = 0;
> +}
> +
> +static int vdec_av1_slice_setup_pfc(struct vdec_av1_slice_instance *instance,
> +				    struct vdec_av1_slice_pfc *pfc)
> +{
> +	struct v4l2_ctrl_av1_frame *ctrl_fh;
> +	struct v4l2_ctrl_av1_sequence *ctrl_seq;
> +	struct vdec_av1_slice_vsi *vsi = &pfc->vsi;
> +	int ret = 0;
> +
> +	/* frame header */
> +	ctrl_fh = (struct v4l2_ctrl_av1_frame *)
> +		  vdec_av1_get_ctrl_ptr(instance->ctx,
> +					V4L2_CID_STATELESS_AV1_FRAME);
> +	if (IS_ERR(ctrl_fh))
> +		return PTR_ERR(ctrl_fh);
> +
> +	ctrl_seq = (struct v4l2_ctrl_av1_sequence *)
> +		   vdec_av1_get_ctrl_ptr(instance->ctx,
> +					 V4L2_CID_STATELESS_AV1_SEQUENCE);
> +	if (IS_ERR(ctrl_seq))
> +		return PTR_ERR(ctrl_seq);

Just to make sure: I assume request api is used? If so, does vdec's framework
ensure that v4l2_ctrl_request_setup() has been called? It influences what's
actually in ctrl->p_cur.p (current or previous value), and the
vdec_av1_get_ctrl_ptr() wrapper returns ctrl->p_cur.p.

> +
> +	/* setup vsi information */
> +	vdec_av1_slice_setup_seq(&vsi->frame.seq, ctrl_seq);
> +	vdec_av1_slice_setup_uh(instance, &vsi->frame, ctrl_fh);
> +	vdec_av1_slice_setup_operating_mode(instance, &vsi->frame);
> +
> +	vdec_av1_slice_setup_state(vsi);
> +	vdec_av1_slice_setup_slot(instance, vsi, ctrl_fh);
> +	vdec_av1_slice_setup_ref(pfc, ctrl_fh);
> +	vdec_av1_slice_get_previous(vsi);
> +
> +	pfc->seq = instance->seq;
> +	instance->seq++;
> +
> +	return ret;
> +}
> +
> +static void vdec_av1_slice_setup_lat_buffer(struct vdec_av1_slice_instance *instance,
> +					    struct vdec_av1_slice_vsi *vsi,
> +					    struct mtk_vcodec_mem *bs,
> +					    struct vdec_lat_buf *lat_buf)
> +{
> +	struct vdec_av1_slice_work_buffer *work_buffer;
> +	int i;
> +
> +	vsi->bs.dma_addr = bs->dma_addr;
> +	vsi->bs.size = bs->size;
> +
> +	vsi->ube.dma_addr = lat_buf->ctx->msg_queue.wdma_addr.dma_addr;
> +	vsi->ube.size = lat_buf->ctx->msg_queue.wdma_addr.size;
> +	vsi->trans.dma_addr = lat_buf->ctx->msg_queue.wdma_wptr_addr;
> +	/* used to store trans end */
> +	vsi->trans.dma_addr_end = lat_buf->ctx->msg_queue.wdma_rptr_addr;
> +	vsi->err_map.dma_addr = lat_buf->wdma_err_addr.dma_addr;
> +	vsi->err_map.size = lat_buf->wdma_err_addr.size;
> +	vsi->rd_mv.dma_addr = lat_buf->rd_mv_addr.dma_addr;
> +	vsi->rd_mv.size = lat_buf->rd_mv_addr.size;
> +
> +	vsi->row_info.buf = 0;
> +	vsi->row_info.size = 0;
> +
> +	work_buffer = vsi->work_buffer;
> +
> +	for (i = 0; i < AV1_MAX_FRAME_BUF_COUNT; i++) {
> +		work_buffer[i].mv_addr.buf = instance->mv[i].dma_addr;
> +		work_buffer[i].mv_addr.size = instance->mv[i].size;
> +		work_buffer[i].segid_addr.buf = instance->seg[i].dma_addr;
> +		work_buffer[i].segid_addr.size = instance->seg[i].size;
> +		work_buffer[i].cdf_addr.buf = instance->cdf[i].dma_addr;
> +		work_buffer[i].cdf_addr.size = instance->cdf[i].size;
> +	}
> +
> +	vsi->cdf_tmp.buf = instance->cdf_temp.dma_addr;
> +	vsi->cdf_tmp.size = instance->cdf_temp.size;
> +
> +	vsi->tile.buf = instance->tile.dma_addr;
> +	vsi->tile.size = instance->tile.size;
> +	memcpy(lat_buf->tile_addr.va, instance->tile.va, 64 * instance->tile_group.num_tiles);
> +
> +	vsi->cdf_table.buf = instance->cdf_table.dma_addr;
> +	vsi->cdf_table.size = instance->cdf_table.size;
> +	vsi->iq_table.buf = instance->iq_table.dma_addr;
> +	vsi->iq_table.size = instance->iq_table.size;
> +}
> +
> +static void vdec_av1_slice_setup_seg_buffer(struct vdec_av1_slice_instance *instance,
> +					    struct vdec_av1_slice_vsi *vsi)
> +{
> +	struct vdec_av1_slice_uncompressed_header *uh = &vsi->frame.uh;
> +	struct mtk_vcodec_mem *buf;
> +
> +	/* reset segment buffer */
> +	if (uh->primary_ref_frame == 7 || !uh->seg.segmentation_enabled) {

#define magic 7?

> +		mtk_vcodec_debug(instance, "reset seg %d\n", vsi->slot_id);
> +		if (vsi->slot_id != AV1_INVALID_IDX) {
> +			buf = &instance->seg[vsi->slot_id];
> +			memset(buf->va, 0, buf->size);
> +		}
> +	}
> +}
> +
> +static void vdec_av1_slice_setup_tile_buffer(struct vdec_av1_slice_instance *instance,
> +					     struct vdec_av1_slice_vsi *vsi,
> +					     struct mtk_vcodec_mem *bs)
> +{
> +	struct vdec_av1_slice_tile_group *tile_group = &instance->tile_group;
> +	struct vdec_av1_slice_uncompressed_header *uh = &vsi->frame.uh;
> +	struct vdec_av1_slice_tile *tile = &uh->tile;
> +	u32 tile_num, tile_row, tile_col;
> +	u32 allow_update_cdf = 0;
> +	u32 sb_boundary_x_m1 = 0, sb_boundary_y_m1 = 0;
> +	int tile_info_base;
> +	u32 tile_buf_pa;
> +	u32 *tile_info_buf = instance->tile.va;
> +	u32 pa = (u32)bs->dma_addr;
> +
> +	if (uh->disable_cdf_update == 0)
> +		allow_update_cdf = 1;
> +
> +	for (tile_num = 0; tile_num < tile_group->num_tiles; tile_num++) {
> +		/* each uint32 takes place of 4 bytes */
> +		tile_info_base = (AV1_TILE_BUF_SIZE * tile_num) >> 2;
> +		tile_row = tile_num / tile->tile_cols;
> +		tile_col = tile_num % tile->tile_cols;
> +		tile_info_buf[tile_info_base + 0] = (tile_group->tile_size[tile_num] << 3);
> +		tile_buf_pa = pa + tile_group->tile_start_offset[tile_num];
> +
> +		tile_info_buf[tile_info_base + 1] = (tile_buf_pa >> 4) << 4;
> +		tile_info_buf[tile_info_base + 2] = (tile_buf_pa % 16) << 3;
> +
> +		sb_boundary_x_m1 =
> +			(tile->mi_col_starts[tile_col + 1] - tile->mi_col_starts[tile_col] - 1) &
> +			0x3f;
> +		sb_boundary_y_m1 =
> +			(tile->mi_row_starts[tile_row + 1] - tile->mi_row_starts[tile_row] - 1) &
> +			0x1ff;
> +
> +		tile_info_buf[tile_info_base + 3] = (sb_boundary_y_m1 << 7) | sb_boundary_x_m1;
> +		tile_info_buf[tile_info_base + 4] = ((allow_update_cdf << 18) | (1 << 16));
> +
> +		if (tile_num == tile->context_update_tile_id &&
> +		    uh->disable_frame_end_update_cdf == 0)
> +			tile_info_buf[tile_info_base + 4] |= (1 << 17);
> +
> +		mtk_vcodec_debug(instance, "// tile buf %d pos(%dx%d) offset 0x%x\n",
> +				 tile_num, tile_row, tile_col, tile_info_base);
> +		mtk_vcodec_debug(instance, "// %08x %08x %08x %08x\n",
> +				 tile_info_buf[tile_info_base + 0],
> +				 tile_info_buf[tile_info_base + 1],
> +				 tile_info_buf[tile_info_base + 2],
> +				 tile_info_buf[tile_info_base + 3]);
> +		mtk_vcodec_debug(instance, "// %08x %08x %08x %08x\n",
> +				 tile_info_buf[tile_info_base + 4],
> +				 tile_info_buf[tile_info_base + 5],
> +				 tile_info_buf[tile_info_base + 6],
> +				 tile_info_buf[tile_info_base + 7]);
> +	}
> +}
> +
> +static int vdec_av1_slice_setup_lat(struct vdec_av1_slice_instance *instance,
> +				    struct mtk_vcodec_mem *bs,
> +				    struct vdec_lat_buf *lat_buf,
> +				    struct vdec_av1_slice_pfc *pfc)
> +{
> +	struct vdec_av1_slice_vsi *vsi = &pfc->vsi;
> +	int ret;
> +
> +	ret = vdec_av1_slice_setup_lat_from_src_buf(instance, vsi, lat_buf);
> +	if (ret)
> +		return ret;
> +
> +	ret = vdec_av1_slice_setup_pfc(instance, pfc);
> +	if (ret)
> +		return ret;
> +
> +	ret = vdec_av1_slice_setup_tile_group(instance, vsi);
> +	if (ret)
> +		return ret;
> +
> +	ret = vdec_av1_slice_alloc_working_buffer(instance, vsi);
> +	if (ret)
> +		return ret;
> +
> +	vdec_av1_slice_setup_seg_buffer(instance, vsi);
> +	vdec_av1_slice_setup_tile_buffer(instance, vsi, bs);
> +	vdec_av1_slice_setup_lat_buffer(instance, vsi, bs, lat_buf);
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_update_lat(struct vdec_av1_slice_instance *instance,
> +				     struct vdec_lat_buf *lat_buf,
> +				     struct vdec_av1_slice_pfc *pfc)
> +{
> +	struct vdec_av1_slice_vsi *vsi;
> +
> +	vsi = &pfc->vsi;
> +	mtk_vcodec_debug(instance, "frame %u LAT CRC 0x%08x, output size is %d\n",
> +			 pfc->seq, vsi->state.crc[0], vsi->state.out_size);
> +
> +	/* buffer full, need to re-decode */
> +	if (vsi->state.full) {
> +		/* buffer not enough */
> +		if (vsi->trans.dma_addr_end - vsi->trans.dma_addr == vsi->ube.size)
> +			return -ENOMEM;
> +		return -EAGAIN;
> +	}
> +
> +	instance->width = vsi->frame.uh.upscaled_width;
> +	instance->height = vsi->frame.uh.frame_height;
> +	instance->frame_type = vsi->frame.uh.frame_type;
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_setup_core_to_dst_buf(struct vdec_av1_slice_instance *instance,
> +						struct vdec_lat_buf *lat_buf)
> +{
> +	struct vb2_v4l2_buffer *dst;
> +
> +	dst = v4l2_m2m_next_dst_buf(instance->ctx->m2m_ctx);
> +	if (!dst)
> +		return -EINVAL;
> +
> +	v4l2_m2m_buf_copy_metadata(&lat_buf->ts_info, dst, true);
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_setup_core_buffer(struct vdec_av1_slice_instance *instance,
> +					    struct vdec_av1_slice_pfc *pfc,
> +					    struct vdec_av1_slice_vsi *vsi,
> +					    struct vdec_fb *fb,
> +					    struct vdec_lat_buf *lat_buf)
> +{
> +	struct vb2_buffer *vb;
> +	struct vb2_queue *vq;
> +	int w, h, plane, size;
> +	int i;
> +
> +	plane = instance->ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes;
> +	w = vsi->frame.uh.upscaled_width;
> +	h = vsi->frame.uh.frame_height;
> +	size = ALIGN(w, VCODEC_DEC_ALIGNED_64) * ALIGN(h, VCODEC_DEC_ALIGNED_64);
> +
> +	/* frame buffer */
> +	vsi->fb.y.dma_addr = fb->base_y.dma_addr;
> +	if (plane == 1)
> +		vsi->fb.c.dma_addr = fb->base_y.dma_addr + size;
> +	else
> +		vsi->fb.c.dma_addr = fb->base_c.dma_addr;
> +
> +	/* reference buffers */
> +	vq = v4l2_m2m_get_vq(instance->ctx->m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +	if (!vq)
> +		return -EINVAL;
> +
> +	/* get current output buffer */
> +	vb = &v4l2_m2m_next_dst_buf(instance->ctx->m2m_ctx)->vb2_buf;
> +	if (!vb)
> +		return -EINVAL;
> +
> +	/* get buffer address from vb2buf */
> +	for (i = 0; i < V4L2_AV1_REFS_PER_FRAME; i++) {
> +		struct vdec_av1_slice_fb *vref = &vsi->ref[i];
> +
> +		vb = vb2_find_buffer(vq, pfc->ref_idx[i]);
> +		if (!vb) {
> +			memset(vref, 0, sizeof(*vref));
> +			continue;
> +		}
> +
> +		vref->y.dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
> +		if (plane == 1)
> +			vref->c.dma_addr = vref->y.dma_addr + size;
> +		else
> +			vref->c.dma_addr = vb2_dma_contig_plane_dma_addr(vb, 1);
> +	}
> +	vsi->tile.dma_addr = lat_buf->tile_addr.dma_addr;
> +	vsi->tile.size = lat_buf->tile_addr.size;
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_setup_core(struct vdec_av1_slice_instance *instance,
> +				     struct vdec_fb *fb,
> +				     struct vdec_lat_buf *lat_buf,
> +				     struct vdec_av1_slice_pfc *pfc)
> +{
> +	struct vdec_av1_slice_vsi *vsi = &pfc->vsi;
> +	int ret;
> +
> +	ret = vdec_av1_slice_setup_core_to_dst_buf(instance, lat_buf);
> +	if (ret)
> +		return ret;
> +
> +	ret = vdec_av1_slice_setup_core_buffer(instance, pfc, vsi, fb, lat_buf);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_update_core(struct vdec_av1_slice_instance *instance,
> +				      struct vdec_lat_buf *lat_buf,
> +				      struct vdec_av1_slice_pfc *pfc)
> +{
> +	struct vdec_av1_slice_vsi *vsi = instance->core_vsi;
> +
> +	/* TODO: Do something here, or remove this function entirely */

And?

> +
> +	mtk_vcodec_debug(instance, "frame %u Y_CRC %08x %08x %08x %08x\n",
> +			 pfc->seq, vsi->state.crc[0], vsi->state.crc[1],
> +			 vsi->state.crc[2], vsi->state.crc[3]);
> +	mtk_vcodec_debug(instance, "frame %u C_CRC %08x %08x %08x %08x\n",
> +			 pfc->seq, vsi->state.crc[8], vsi->state.crc[9],
> +			 vsi->state.crc[10], vsi->state.crc[11]);
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_init(struct mtk_vcodec_ctx *ctx)
> +{
> +	struct vdec_av1_slice_instance *instance;
> +	struct vdec_av1_slice_init_vsi *vsi;
> +	int ret;
> +
> +	instance = kzalloc(sizeof(*instance), GFP_KERNEL);
> +	if (!instance)
> +		return -ENOMEM;
> +
> +	instance->ctx = ctx;
> +	instance->vpu.id = SCP_IPI_VDEC_LAT;
> +	instance->vpu.core_id = SCP_IPI_VDEC_CORE;
> +	instance->vpu.ctx = ctx;
> +	instance->vpu.codec_type = ctx->current_codec;
> +
> +	ret = vpu_dec_init(&instance->vpu);
> +	if (ret) {
> +		mtk_vcodec_err(instance, "failed to init vpu dec, ret %d\n", ret);
> +		goto error_vpu_init;
> +	}
> +
> +	/* init vsi and global flags */
> +	vsi = instance->vpu.vsi;
> +	if (!vsi) {
> +		mtk_vcodec_err(instance, "failed to get AV1 vsi\n");
> +		ret = -EINVAL;
> +		goto error_vsi;
> +	}
> +	instance->init_vsi = vsi;
> +	instance->core_vsi = mtk_vcodec_fw_map_dm_addr(ctx->dev->fw_handler, (u32)vsi->core_vsi);
> +
> +	if (!instance->core_vsi) {
> +		mtk_vcodec_err(instance, "failed to get AV1 core vsi\n");
> +		ret = -EINVAL;
> +		goto error_vsi;
> +	}
> +
> +	if (vsi->vsi_size != sizeof(struct vdec_av1_slice_vsi))
> +		mtk_vcodec_err(instance, "remote vsi size 0x%x mismatch! expected: 0x%lx\n",
> +			       vsi->vsi_size, sizeof(struct vdec_av1_slice_vsi));
> +
> +	instance->irq = 1;

Does this mean "irq_enabled"? If so, rename?

> +	instance->inneracing_mode = IS_VDEC_INNER_RACING(instance->ctx->dev->dec_capability);
> +
> +	mtk_vcodec_debug(instance, "vsi 0x%p core_vsi 0x%llx 0x%p, inneracing_mode %d\n",
> +			 vsi, vsi->core_vsi, instance->core_vsi, instance->inneracing_mode);
> +
> +	ret = vdec_av1_slice_init_cdf_table(instance);
> +	if (ret)
> +		goto error_vsi;
> +
> +	ret = vdec_av1_slice_init_iq_table(instance);
> +	if (ret)
> +		goto error_vsi;
> +
> +	ctx->drv_handle = instance;
> +
> +	return 0;
> +error_vsi:
> +	vpu_dec_deinit(&instance->vpu);
> +error_vpu_init:
> +	kfree(instance);

newline?

> +	return ret;
> +}
> +
> +static void vdec_av1_slice_deinit(void *h_vdec)
> +{
> +	struct vdec_av1_slice_instance *instance = h_vdec;
> +
> +	if (!instance)
> +		return;
> +	mtk_vcodec_debug(instance, "h_vdec 0x%p\n", h_vdec);
> +	vpu_dec_deinit(&instance->vpu);
> +	vdec_av1_slice_free_working_buffer(instance);
> +	vdec_msg_queue_deinit(&instance->ctx->msg_queue, instance->ctx);
> +	kfree(instance);
> +}
> +
> +static int vdec_av1_slice_flush(void *h_vdec, struct mtk_vcodec_mem *bs,
> +				struct vdec_fb *fb, bool *res_chg)
> +{
> +	struct vdec_av1_slice_instance *instance = h_vdec;
> +	int i;
> +
> +	mtk_vcodec_debug(instance, "flush ...\n");
> +
> +	for (i = 0; i < AV1_MAX_FRAME_BUF_COUNT; i++)
> +		vdec_av1_slice_clear_fb(&instance->slots.frame_info[i]);
> +
> +	vdec_msg_queue_wait_lat_buf_full(&instance->ctx->msg_queue);

newline?

> +	return vpu_dec_reset(&instance->vpu);
> +}
> +
> +static void vdec_av1_slice_get_pic_info(struct vdec_av1_slice_instance *instance)
> +{
> +	struct mtk_vcodec_ctx *ctx = instance->ctx;
> +	u32 data[3];
> +
> +	mtk_vcodec_debug(instance, "w %u h %u\n", ctx->picinfo.pic_w, ctx->picinfo.pic_h);
> +
> +	data[0] = ctx->picinfo.pic_w;
> +	data[1] = ctx->picinfo.pic_h;
> +	data[2] = ctx->capture_fourcc;
> +	vpu_dec_get_param(&instance->vpu, data, 3, GET_PARAM_PIC_INFO);
> +
> +	ctx->picinfo.buf_w = ALIGN(ctx->picinfo.pic_w, VCODEC_DEC_ALIGNED_64);
> +	ctx->picinfo.buf_h = ALIGN(ctx->picinfo.pic_h, VCODEC_DEC_ALIGNED_64);
> +	ctx->picinfo.fb_sz[0] = instance->vpu.fb_sz[0];
> +	ctx->picinfo.fb_sz[1] = instance->vpu.fb_sz[1];
> +}
> +
> +static void vdec_av1_slice_get_dpb_size(struct vdec_av1_slice_instance *instance, u32 *dpb_sz)

static inline void?

> +{
> +	/* refer av1 specification */
> +	*dpb_sz = V4L2_AV1_TOTAL_REFS_PER_FRAME + 1;
> +}
> +
> +static void vdec_av1_slice_get_crop_info(struct vdec_av1_slice_instance *instance,
> +					 struct v4l2_rect *cr)
> +{
> +	struct mtk_vcodec_ctx *ctx = instance->ctx;
> +
> +	cr->left = 0;
> +	cr->top = 0;
> +	cr->width = ctx->picinfo.pic_w;
> +	cr->height = ctx->picinfo.pic_h;
> +
> +	mtk_vcodec_debug(instance, "l=%d, t=%d, w=%d, h=%d\n",
> +			 cr->left, cr->top, cr->width, cr->height);
> +}
> +
> +static int vdec_av1_slice_get_param(void *h_vdec, enum vdec_get_param_type type, void *out)
> +{
> +	struct vdec_av1_slice_instance *instance = h_vdec;
> +
> +	switch (type) {
> +	case GET_PARAM_PIC_INFO:
> +		vdec_av1_slice_get_pic_info(instance);
> +		break;
> +	case GET_PARAM_DPB_SIZE:
> +		vdec_av1_slice_get_dpb_size(instance, out);
> +		break;
> +	case GET_PARAM_CROP_INFO:
> +		vdec_av1_slice_get_crop_info(instance, out);
> +		break;
> +	default:
> +		mtk_vcodec_err(instance, "invalid get parameter type=%d\n", type);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vdec_av1_slice_lat_decode(void *h_vdec, struct mtk_vcodec_mem *bs,
> +				     struct vdec_fb *fb, bool *res_chg)
> +{
> +	struct vdec_av1_slice_instance *instance = h_vdec;
> +	struct vdec_lat_buf *lat_buf;
> +	struct vdec_av1_slice_pfc *pfc;
> +	struct vdec_av1_slice_vsi *vsi;
> +	struct mtk_vcodec_ctx *ctx;
> +	int ret;
> +
> +	if (!instance || !instance->ctx)
> +		return -EINVAL;
> +
> +	ctx = instance->ctx;
> +	/* init msgQ for the first time */
> +	if (vdec_msg_queue_init(&ctx->msg_queue, ctx,
> +				vdec_av1_slice_core_decode, sizeof(*pfc))) {
> +		mtk_vcodec_err(instance, "failed to init AV1 msg queue\n");
> +		return -ENOMEM;
> +	}
> +
> +	/* bs NULL means flush decoder */
> +	if (!bs)
> +		return vdec_av1_slice_flush(h_vdec, bs, fb, res_chg);
> +
> +	lat_buf = vdec_msg_queue_dqbuf(&ctx->msg_queue.lat_ctx);
> +	if (!lat_buf) {
> +		mtk_vcodec_err(instance, "failed to get AV1 lat buf\n");

there exists vdec_msg_queue_deinit(). Should it be called in this (and 
subsequent) error recovery path(s)?

> +		return -EBUSY;
> +	}
> +	pfc = (struct vdec_av1_slice_pfc *)lat_buf->private_data;
> +	if (!pfc) {
> +		ret = -EINVAL;
> +		goto err_free_fb_out;
> +	}
> +	vsi = &pfc->vsi;
> +
> +	ret = vdec_av1_slice_setup_lat(instance, bs, lat_buf, pfc);
> +	if (ret) {
> +		mtk_vcodec_err(instance, "failed to setup AV1 lat ret %d\n", ret);
> +		goto err_free_fb_out;
> +	}
> +
> +	vdec_av1_slice_vsi_to_remote(vsi, instance->vsi);
> +	ret = vpu_dec_start(&instance->vpu, NULL, 0);
> +	if (ret) {
> +		mtk_vcodec_err(instance, "failed to dec AV1 ret %d\n", ret);
> +		goto err_free_fb_out;
> +	}
> +	if (instance->inneracing_mode)
> +		vdec_msg_queue_qbuf(&ctx->dev->msg_queue_core_ctx, lat_buf);
> +
> +	if (instance->irq) {
> +		ret = mtk_vcodec_wait_for_done_ctx(ctx, MTK_INST_IRQ_RECEIVED,
> +						   WAIT_INTR_TIMEOUT_MS,
> +						   MTK_VDEC_LAT0);
> +		/* update remote vsi if decode timeout */
> +		if (ret) {
> +			mtk_vcodec_err(instance, "AV1 Frame %d decode timeout %d\n", pfc->seq, ret);
> +			WRITE_ONCE(instance->vsi->state.timeout, 1);
> +		}
> +		vpu_dec_end(&instance->vpu);
> +	}
> +
> +	vdec_av1_slice_vsi_from_remote(vsi, instance->vsi);
> +	ret = vdec_av1_slice_update_lat(instance, lat_buf, pfc);
> +
> +	/* LAT trans full, re-decode */
> +	if (ret == -EAGAIN) {
> +		mtk_vcodec_err(instance, "AV1 Frame %d trans full\n", pfc->seq);
> +		if (!instance->inneracing_mode)
> +			vdec_msg_queue_qbuf(&ctx->msg_queue.lat_ctx, lat_buf);
> +		return 0;
> +	}
> +
> +	/* LAT trans full, no more UBE or decode timeout */
> +	if (ret == -ENOMEM || vsi->state.timeout) {
> +		mtk_vcodec_err(instance, "AV1 Frame %d insufficient buffer or timeout\n", pfc->seq);
> +		if (!instance->inneracing_mode)
> +			vdec_msg_queue_qbuf(&ctx->msg_queue.lat_ctx, lat_buf);
> +		return -EBUSY;
> +	}
> +	vsi->trans.dma_addr_end += ctx->msg_queue.wdma_addr.dma_addr;
> +	mtk_vcodec_debug(instance, "lat dma 1 0x%llx 0x%llx\n",
> +			 pfc->vsi.trans.dma_addr, pfc->vsi.trans.dma_addr_end);
> +
> +	vdec_msg_queue_update_ube_wptr(&ctx->msg_queue, vsi->trans.dma_addr_end);
> +
> +	if (!instance->inneracing_mode)
> +		vdec_msg_queue_qbuf(&ctx->dev->msg_queue_core_ctx, lat_buf);
> +	memcpy(&instance->slots, &vsi->slots, sizeof(instance->slots));
> +
> +	return 0;
> +
> +err_free_fb_out:
> +	vdec_msg_queue_qbuf(&ctx->msg_queue.lat_ctx, lat_buf);
> +	mtk_vcodec_err(instance, "slice dec number: %d err: %d", pfc->seq, ret);
> +	return ret;
> +}
> +
> +static int vdec_av1_slice_core_decode(struct vdec_lat_buf *lat_buf)
> +{
> +	struct vdec_av1_slice_instance *instance;
> +	struct vdec_av1_slice_pfc *pfc;
> +	struct mtk_vcodec_ctx *ctx = NULL;
> +	struct vdec_fb *fb = NULL;
> +	int ret = -EINVAL;
> +
> +	if (!lat_buf)
> +		return -EINVAL;
> +
> +	pfc = lat_buf->private_data;
> +	ctx = lat_buf->ctx;
> +	if (!pfc || !ctx)
> +		return -EINVAL;
> +
> +	instance = ctx->drv_handle;
> +	if (!instance)
> +		goto err;
> +
> +	fb = ctx->dev->vdec_pdata->get_cap_buffer(ctx);
> +	if (!fb) {
> +		ret = -EBUSY;
> +		goto err;
> +	}
> +
> +	ret = vdec_av1_slice_setup_core(instance, fb, lat_buf, pfc);
> +	if (ret) {
> +		mtk_vcodec_err(instance, "vdec_av1_slice_setup_core\n");
> +		goto err;
> +	}
> +	vdec_av1_slice_vsi_to_remote(&pfc->vsi, instance->core_vsi);
> +	ret = vpu_dec_core(&instance->vpu);
> +	if (ret) {
> +		mtk_vcodec_err(instance, "vpu_dec_core\n");
> +		goto err;
> +	}
> +
> +	if (instance->irq) {
> +		ret = mtk_vcodec_wait_for_done_ctx(ctx, MTK_INST_IRQ_RECEIVED,
> +						   WAIT_INTR_TIMEOUT_MS,
> +						   MTK_VDEC_CORE);
> +		/* update remote vsi if decode timeout */
> +		if (ret) {
> +			mtk_vcodec_err(instance, "AV1 frame %d core timeout\n", pfc->seq);
> +			WRITE_ONCE(instance->vsi->state.timeout, 1);
> +		}
> +		vpu_dec_core_end(&instance->vpu);
> +	}
> +
> +	ret = vdec_av1_slice_update_core(instance, lat_buf, pfc);
> +	if (ret) {
> +		mtk_vcodec_err(instance, "vdec_av1_slice_update_core\n");
> +		goto err;
> +	}
> +
> +	mtk_vcodec_debug(instance, "core dma_addr_end 0x%llx\n",
> +			 instance->core_vsi->trans.dma_addr_end);
> +	vdec_msg_queue_update_ube_rptr(&ctx->msg_queue, instance->core_vsi->trans.dma_addr_end);
> +
> +	ctx->dev->vdec_pdata->cap_to_disp(ctx, 0, lat_buf->src_buf_req);
> +
> +	return 0;
> +
> +err:
> +	/* always update read pointer */
> +	vdec_msg_queue_update_ube_rptr(&ctx->msg_queue, pfc->vsi.trans.dma_addr_end);
> +
> +	if (fb)
> +		ctx->dev->vdec_pdata->cap_to_disp(ctx, 1, lat_buf->src_buf_req);
> +
> +	return ret;
> +}
> +
> +const struct vdec_common_if vdec_av1_slice_lat_if = {
> +	.init		= vdec_av1_slice_init,
> +	.decode		= vdec_av1_slice_lat_decode,
> +	.get_param	= vdec_av1_slice_get_param,
> +	.deinit		= vdec_av1_slice_deinit,
> +};
> diff --git a/drivers/media/platform/mediatek/vcodec/vdec_drv_if.c b/drivers/media/platform/mediatek/vcodec/vdec_drv_if.c
> index f3807f03d8806..4dda59a6c8141 100644
> --- a/drivers/media/platform/mediatek/vcodec/vdec_drv_if.c
> +++ b/drivers/media/platform/mediatek/vcodec/vdec_drv_if.c
> @@ -49,6 +49,10 @@ int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc)
>   		ctx->dec_if = &vdec_vp9_slice_lat_if;
>   		ctx->hw_id = IS_VDEC_LAT_ARCH(hw_arch) ? MTK_VDEC_LAT0 : MTK_VDEC_CORE;
>   		break;
> +	case V4L2_PIX_FMT_AV1_FRAME:
> +		ctx->dec_if = &vdec_av1_slice_lat_if;
> +		ctx->hw_id = MTK_VDEC_LAT0;
> +		break;
>   	default:
>   		return -EINVAL;
>   	}
> diff --git a/drivers/media/platform/mediatek/vcodec/vdec_drv_if.h b/drivers/media/platform/mediatek/vcodec/vdec_drv_if.h
> index 076306ff2dd49..dc6c8ecd9843a 100644
> --- a/drivers/media/platform/mediatek/vcodec/vdec_drv_if.h
> +++ b/drivers/media/platform/mediatek/vcodec/vdec_drv_if.h
> @@ -61,6 +61,7 @@ extern const struct vdec_common_if vdec_vp8_if;
>   extern const struct vdec_common_if vdec_vp8_slice_if;
>   extern const struct vdec_common_if vdec_vp9_if;
>   extern const struct vdec_common_if vdec_vp9_slice_lat_if;
> +extern const struct vdec_common_if vdec_av1_slice_lat_if;
>   
>   /**
>    * vdec_if_init() - initialize decode driver
> diff --git a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
> index ae500980ad45c..05b54b0e3f2d2 100644
> --- a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
> +++ b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
> @@ -20,6 +20,9 @@
>   /* the size used to store avc error information */
>   #define VDEC_ERR_MAP_SZ_AVC         (17 * SZ_1K)
>   
> +#define VDEC_RD_MV_BUFFER_SZ        (((SZ_4K * 2304 >> 4) + SZ_1K) << 1)
> +#define VDEC_LAT_TILE_SZ            (64 * SZ_4K)
> +
>   /* core will read the trans buffer which decoded by lat to decode again.
>    * The trans buffer size of FHD and 4K bitstreams are different.
>    */
> @@ -194,6 +197,14 @@ void vdec_msg_queue_deinit(struct vdec_msg_queue *msg_queue,
>   		if (mem->va)
>   			mtk_vcodec_mem_free(ctx, mem);
>   
> +		mem = &lat_buf->rd_mv_addr;
> +		if (mem->va)
> +			mtk_vcodec_mem_free(ctx, mem);
> +
> +		mem = &lat_buf->tile_addr;
> +		if (mem->va)
> +			mtk_vcodec_mem_free(ctx, mem);
> +
>   		kfree(lat_buf->private_data);
>   	}
>   }
> @@ -270,6 +281,22 @@ int vdec_msg_queue_init(struct vdec_msg_queue *msg_queue,
>   			goto mem_alloc_err;
>   		}
>   
> +		if (ctx->current_codec == V4L2_PIX_FMT_AV1_FRAME) {
> +			lat_buf->rd_mv_addr.size = VDEC_RD_MV_BUFFER_SZ;
> +			err = mtk_vcodec_mem_alloc(ctx, &lat_buf->rd_mv_addr);
> +			if (err) {
> +				mtk_v4l2_err("failed to allocate rd_mv_addr buf[%d]", i);
> +				return -ENOMEM;
> +			}
> +
> +			lat_buf->tile_addr.size = VDEC_LAT_TILE_SZ;
> +			err = mtk_vcodec_mem_alloc(ctx, &lat_buf->tile_addr);
> +			if (err) {
> +				mtk_v4l2_err("failed to allocate tile_addr buf[%d]", i);
> +				return -ENOMEM;
> +			}
> +		}
> +
>   		lat_buf->private_data = kzalloc(private_size, GFP_KERNEL);
>   		if (!lat_buf->private_data) {
>   			err = -ENOMEM;
> diff --git a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.h b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.h
> index c43d427f5f544..525170e411ee0 100644
> --- a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.h
> +++ b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.h
> @@ -42,6 +42,8 @@ struct vdec_msg_queue_ctx {
>    * struct vdec_lat_buf - lat buffer message used to store lat info for core decode
>    * @wdma_err_addr: wdma error address used for lat hardware
>    * @slice_bc_addr: slice bc address used for lat hardware
> + * @rd_mv_addr:	mv addr for av1 lat hardware output, core hardware input
> + * @tile_addr:	tile buffer for av1 core input
>    * @ts_info: need to set timestamp from output to capture
>    * @src_buf_req: output buffer media request object
>    *
> @@ -54,6 +56,8 @@ struct vdec_msg_queue_ctx {
>   struct vdec_lat_buf {
>   	struct mtk_vcodec_mem wdma_err_addr;
>   	struct mtk_vcodec_mem slice_bc_addr;
> +	struct mtk_vcodec_mem rd_mv_addr;
> +	struct mtk_vcodec_mem tile_addr;
>   	struct vb2_v4l2_buffer ts_info;
>   	struct media_request *src_buf_req;
>