linux-kernel - Re: [PATCH v3 08/11] media: verisilicon: postproc: Fix down scale test

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Message-ID: <6798cc82-d5dc-5603-7e7e-57ce09c09d24@collabora.com>
Date:   Thu, 22 Jun 2023 17:27:23 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com
Subject: Re: [PATCH v3 08/11] media: verisilicon: postproc: Fix down scale
 test


Le 22/06/2023 à 15:13, Benjamin Gaignard a écrit :
> Do not allow down scaling if the source buffer resolution is
> smaller than destination one.
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
>   drivers/media/platform/verisilicon/hantro_postproc.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/verisilicon/hantro_postproc.c b/drivers/media/platform/verisilicon/hantro_postproc.c
> index a6b67d0cc66c..a4f2c5e8932c 100644
> --- a/drivers/media/platform/verisilicon/hantro_postproc.c
> +++ b/drivers/media/platform/verisilicon/hantro_postproc.c
> @@ -103,7 +103,10 @@ static void hantro_postproc_g1_enable(struct hantro_ctx *ctx)
>   
>   static int down_scale_factor(struct hantro_ctx *ctx)
>   {
> -	if (ctx->src_fmt.width == ctx->dst_fmt.width)
> +	if (ctx->src_fmt.width <= ctx->dst_fmt.width)
> +		return 0;
> +
> +	if (ctx->src_fmt.height <= ctx->dst_fmt.height)

One test will be enough.
I will fix that in v4.

Benjamin

>   		return 0;
>   
>   	return DIV_ROUND_CLOSEST(ctx->src_fmt.width, ctx->dst_fmt.width);