Re: [PATCH] media: rkvdec: use DIV_ROUND_UP() for CTB counts

[Nicolas Dufresne]

Le dimanche 12 juillet 2026 à 16:26 +0900, Hiroki Nakajima a écrit :
> Use DIV_ROUND_UP() when computing HEVC coding tree block counts
> instead of open-coding the same rounding expression. This keeps the
> rounding intent explicit without changing behavior.
> 
> Found using a Coccinelle rule generated from the DIV_ROUND_UP() macro
> definition.
> 
> Signed-off-by: Hiroki Nakajima <3na7nanana@xxxxxxxxx>

Reviewed-by: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>

> ---
>  drivers/media/platform/rockchip/rkvdec/rkvdec-hevc.c      | 4 ++--
>  .../media/platform/rockchip/rkvdec/rkvdec-vdpu381-hevc.c  | 8 ++++----
>  .../media/platform/rockchip/rkvdec/rkvdec-vdpu383-hevc.c  | 8 ++++----
>  3 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkvdec/rkvdec-hevc.c
> b/drivers/media/platform/rockchip/rkvdec/rkvdec-hevc.c
> index 87abf93dfd5e..ff3942f91c5d 100644
> --- a/drivers/media/platform/rockchip/rkvdec/rkvdec-hevc.c
> +++ b/drivers/media/platform/rockchip/rkvdec/rkvdec-hevc.c
> @@ -258,9 +258,9 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
>  		for (i = 0; i <= pps->num_tile_rows_minus1; i++)
>  			WRITE_PPS(pps->row_height_minus1[i], ROW_HEIGHT(i));
>  	} else {
> -		WRITE_PPS(((sps->pic_width_in_luma_samples + ctb_size_y - 1)
> / ctb_size_y) - 1,
> +		WRITE_PPS(DIV_ROUND_UP(sps->pic_width_in_luma_samples,
> ctb_size_y) - 1,
>  			  COLUMN_WIDTH(0));
> -		WRITE_PPS(((sps->pic_height_in_luma_samples + ctb_size_y - 1)
> / ctb_size_y) - 1,
> +		WRITE_PPS(DIV_ROUND_UP(sps->pic_height_in_luma_samples,
> ctb_size_y) - 1,
>  			  ROW_HEIGHT(0));
>  	}
>  
> diff --git a/drivers/media/platform/rockchip/rkvdec/rkvdec-vdpu381-hevc.c
> b/drivers/media/platform/rockchip/rkvdec/rkvdec-vdpu381-hevc.c
> index fe6414a17551..d07c74679552 100644
> --- a/drivers/media/platform/rockchip/rkvdec/rkvdec-vdpu381-hevc.c
> +++ b/drivers/media/platform/rockchip/rkvdec/rkvdec-vdpu381-hevc.c
> @@ -261,8 +261,8 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
>  	memset(row_height, 0, sizeof(row_height));
>  
>  	max_cu_width = 1 << (sps->log2_diff_max_min_luma_coding_block_size +
> log2_min_cb_size);
> -	pic_in_cts_width = (width + max_cu_width - 1) / max_cu_width;
> -	pic_in_cts_height = (height + max_cu_width - 1) / max_cu_width;
> +	pic_in_cts_width = DIV_ROUND_UP(width, max_cu_width);
> +	pic_in_cts_height = DIV_ROUND_UP(height, max_cu_width);
>  
>  	if (pps->flags & V4L2_HEVC_PPS_FLAG_TILES_ENABLED) {
>  		if (pps->flags & V4L2_HEVC_PPS_FLAG_UNIFORM_SPACING) {
> @@ -275,8 +275,8 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
>  						  column_width, row_height);
>  		}
>  	} else {
> -		column_width[0] = (width + max_cu_width - 1) / max_cu_width;
> -		row_height[0] = (height + max_cu_width - 1) / max_cu_width;
> +		column_width[0] = DIV_ROUND_UP(width, max_cu_width);
> +		row_height[0] = DIV_ROUND_UP(height, max_cu_width);
>  	}
>  
>  	for (i = 0; i < 20; i++) {
> diff --git a/drivers/media/platform/rockchip/rkvdec/rkvdec-vdpu383-hevc.c
> b/drivers/media/platform/rockchip/rkvdec/rkvdec-vdpu383-hevc.c
> index 3575338a531a..3462d995d4cf 100644
> --- a/drivers/media/platform/rockchip/rkvdec/rkvdec-vdpu383-hevc.c
> +++ b/drivers/media/platform/rockchip/rkvdec/rkvdec-vdpu383-hevc.c
> @@ -287,8 +287,8 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
>  	memset(row_height, 0, sizeof(row_height));
>  
>  	max_cu_width = 1 << (sps->log2_diff_max_min_luma_coding_block_size +
> log2_min_cb_size);
> -	pic_in_cts_width = (width + max_cu_width - 1) / max_cu_width;
> -	pic_in_cts_height = (height + max_cu_width - 1) / max_cu_width;
> +	pic_in_cts_width = DIV_ROUND_UP(width, max_cu_width);
> +	pic_in_cts_height = DIV_ROUND_UP(height, max_cu_width);
>  
>  	if (tiles_enabled) {
>  		if (pps->flags & V4L2_HEVC_PPS_FLAG_UNIFORM_SPACING) {
> @@ -301,8 +301,8 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
>  						  column_width, row_height);
>  		}
>  	} else {
> -		column_width[0] = (width + max_cu_width - 1) / max_cu_width;
> -		row_height[0] = (height + max_cu_width - 1) / max_cu_width;
> +		column_width[0] = DIV_ROUND_UP(width, max_cu_width);
> +		row_height[0] = DIV_ROUND_UP(height, max_cu_width);
>  	}
>  
>  	for (i = 0; i < 20; i++)

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