Re: [PATCH 3/7] media: hantro: HEVC: Fix chroma offset computation

From: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
To: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Cc: mchehab@kernel.org, hverkuil@xs4all.nl,
	ezequiel@vanguardiasur.com.ar, p.zabel@pengutronix.de,
	gregkh@linuxfoundation.org, mripard@kernel.org, wens@csie.org,
	jernej.skrabec@gmail.com, samuel@sholland.org,
	nicolas.dufresne@collabora.com, andrzej.p@collabora.com,
	linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-rockchip@lists.infradead.org,
	linux-staging@lists.linux.dev,
	linux-arm-kernel@lists.infradead.org,
	linux-sunxi@lists.linux.dev, kernel@collabora.com
Subject: Re: [PATCH 3/7] media: hantro: HEVC: Fix chroma offset computation
Date: Fri, 1 Jul 2022 10:47:10 +0200	[thread overview]
Message-ID: <Yr60jj4OOAM6plWC@aptenodytes> (raw)
In-Reply-To: <20220617115802.396442-4-benjamin.gaignard@collabora.com>

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Hi Benjamin,

On Fri 17 Jun 22, 13:57, Benjamin Gaignard wrote:
> The chroma offset depends of the bitstream depth.
> Make sure that ctx->bit_depth is used to compute it.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> ---
>  drivers/staging/media/hantro/hantro_g2_hevc_dec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/hantro/hantro_g2_hevc_dec.c b/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
> index 9eac133bda68..8407ad45b7b7 100644
> --- a/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
> +++ b/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
> @@ -12,7 +12,7 @@
>  
>  static size_t hantro_hevc_chroma_offset(struct hantro_ctx *ctx)
>  {
> -	return ctx->dst_fmt.width * ctx->dst_fmt.height;
> +	return ctx->dst_fmt.width * ctx->dst_fmt.height * ctx->bit_depth / 8;

Is this a case for DIV_ROUND_UP or are you sure the rounded-down size is always
sufficient?

Cheers,

Paul

>  }
>  
>  static size_t hantro_hevc_motion_vectors_offset(struct hantro_ctx *ctx)
> -- 
> 2.32.0
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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