linux-kernel - Re: [PATCH] media: cedrus: h264: Fix neighbour info buffer size

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Date:   Fri, 18 Feb 2022 09:53:57 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Jernej Skrabec <jernej.skrabec@...il.com>, mripard@...nel.org,
        paul.kocialkowski@...tlin.com
Cc:     mchehab@...nel.org, wens@...e.org, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: cedrus: h264: Fix neighbour info buffer size

Le lundi 14 février 2022 à 20:08 +0100, Jernej Skrabec a écrit :
> According to BSP library source, H264 neighbour info buffer size needs
> to be 32 kiB for H6. This is similar to H265 decoding, which also needs
> double buffer size in comparison to older Cedrus core generations.
> 
> Increase buffer size to cover H6 needs. Since increase is not that big
> in absolute numbers, it doesn't make sense to complicate logic for older
> generations.
> 
> Issue was discovered using iommu and cross checked with BSP library
> source.
> 
> Fixes: 6eb9b758e307 ("media: cedrus: Add H264 decoding support")
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>

Acked-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>

> ---
>  drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> index b4173a8926d6..d8fb93035470 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> @@ -38,7 +38,7 @@ struct cedrus_h264_sram_ref_pic {
>  
>  #define CEDRUS_H264_FRAME_NUM		18
>  
> -#define CEDRUS_NEIGHBOR_INFO_BUF_SIZE	(16 * SZ_1K)
> +#define CEDRUS_NEIGHBOR_INFO_BUF_SIZE	(32 * SZ_1K)
>  #define CEDRUS_MIN_PIC_INFO_BUF_SIZE       (130 * SZ_1K)
>  
>  static void cedrus_h264_write_sram(struct cedrus_dev *dev,