linux-kernel - Re: [PATCH v2 1/4] media: hevc: Remove RPS named flags

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Date:   Wed, 10 Nov 2021 20:26:04 +0100
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     mchehab@...nel.org, p.zabel@...gutronix.de,
        gregkh@...uxfoundation.org, mripard@...nel.org,
        paul.kocialkowski@...tlin.com, wens@...e.org,
        hverkuil-cisco@...all.nl, jc@...esim.co.uk,
        ezequiel@...guardiasur.com.ar,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: Re: [PATCH v2 1/4] media: hevc: Remove RPS named flags

Hi Benjamin,

Dne torek, 12. oktober 2021 ob 16:35:49 CET je Benjamin Gaignard napisal(a):
> Marking a picture as long-term reference is valid for DPB but not for RPS.
> Change flag name to match with it description in HEVC spec chapiter

chapiter -> chapter

> "8.3.2 Decoding process for reference picture set".
> Remove the other unused RPS flags.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
> version 2:
> - change DPB field name from rps to flags
> 
>  Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 8 +++-----
>  drivers/staging/media/hantro/hantro_g2_hevc_dec.c         | 2 +-
>  drivers/staging/media/sunxi/cedrus/cedrus_h265.c          | 2 +-
>  include/media/hevc-ctrls.h                                | 6 ++----
>  4 files changed, 7 insertions(+), 11 deletions(-)
> 
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index e141f0e4eec9..38da33e61c3d 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -3166,11 +3166,9 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
>  	:c:func:`v4l2_timeval_to_ns()` function to convert the struct
>  	:c:type:`timeval` in struct :c:type:`v4l2_buffer` to a __u64.
>      * - __u8
> -      - ``rps``
> -      - The reference set for the reference frame
> -        (V4L2_HEVC_DPB_ENTRY_RPS_ST_CURR_BEFORE,
> -        V4L2_HEVC_DPB_ENTRY_RPS_ST_CURR_AFTER or
> -        V4L2_HEVC_DPB_ENTRY_RPS_LT_CURR)
> +      - ``flags``
> +      - Long term flag for the reference frame
> +        (V4L2_HEVC_DPB_ENTRY_LONG_TERM_REFERENCE)
>      * - __u8
>        - ``field_pic``
>        - Whether the reference is a field picture or a frame.
> diff --git a/drivers/staging/media/hantro/hantro_g2_hevc_dec.c b/drivers/
staging/media/hantro/hantro_g2_hevc_dec.c
> index 76a921163b9a..bbf71dcea099 100644
> --- a/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
> +++ b/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
> @@ -445,7 +445,7 @@ static int set_ref(struct hantro_ctx *ctx)
>  		chroma_addr = luma_addr + cr_offset;
>  		mv_addr = luma_addr + mv_offset;
>  
> -		if (dpb[i].rps == V4L2_HEVC_DPB_ENTRY_RPS_LT_CURR)
> +		if (dpb[i].flags == 
V4L2_HEVC_DPB_ENTRY_LONG_TERM_REFERENCE)
>  			dpb_longterm_e |= 
BIT(V4L2_HEVC_DPB_ENTRIES_NUM_MAX - 1 - i);
>  
>  		hantro_write_addr(vpu, G2_REG_ADDR_REF(i), luma_addr);
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/
staging/media/sunxi/cedrus/cedrus_h265.c
> index 3d9561d4aadb..1edfc3823a57 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> @@ -169,7 +169,7 @@ static void cedrus_h265_ref_pic_list_write(struct 
cedrus_dev *dev,
>  		unsigned int index = list[i];
>  		u8 value = list[i];
>  
> -		if (dpb[index].rps == V4L2_HEVC_DPB_ENTRY_RPS_LT_CURR)
> +		if (dpb[index].flags == 
V4L2_HEVC_DPB_ENTRY_LONG_TERM_REFERENCE)

Flags are usually checked with "&", same goes in Hantro case.

Once all fixed, this patch is:
Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

>  			value |= 
VE_DEC_H265_SRAM_REF_PIC_LIST_LT_REF;
>  
>  		/* Each SRAM word gathers up to 4 references. */
> diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
> index ef63bc205756..01ccda48d8c5 100644
> --- a/include/media/hevc-ctrls.h
> +++ b/include/media/hevc-ctrls.h
> @@ -127,15 +127,13 @@ struct v4l2_ctrl_hevc_pps {
>  	__u64	flags;
>  };
>  
> -#define V4L2_HEVC_DPB_ENTRY_RPS_ST_CURR_BEFORE	0x01
> -#define V4L2_HEVC_DPB_ENTRY_RPS_ST_CURR_AFTER	0x02
> -#define V4L2_HEVC_DPB_ENTRY_RPS_LT_CURR		0x03
> +#define V4L2_HEVC_DPB_ENTRY_LONG_TERM_REFERENCE	0x01
>  
>  #define V4L2_HEVC_DPB_ENTRIES_NUM_MAX		16
>  
>  struct v4l2_hevc_dpb_entry {
>  	__u64	timestamp;
> -	__u8	rps;
> +	__u8	flags;
>  	__u8	field_pic;
>  	__u16	pic_order_cnt[2];
>  	__u8	padding[2];
> -- 
> 2.30.2
> 
>