linux-kernel - Re: [PATCH v3 5/8] [media] s5p-jpeg: Split s5p_jpeg_parse

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Date:   Thu, 29 Jun 2017 14:04:26 +0200
From:   Andrzej Pietrasiewicz <andrzej.p@...sung.com>
To:     Thierry Escande <thierry.escande@...labora.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/8] [media] s5p-jpeg: Split s5p_jpeg_parse_hdr()

W dniu 27.06.2017 o 18:08, Thierry Escande pisze:
> This patch moves the subsampling value decoding read from the jpeg
> header into its own function. This new function is called
> s5p_jpeg_subsampling_decode() and returns true if it successfully
> decodes the subsampling value, false otherwise.
> 
> Signed-off-by: Thierry Escande <thierry.escande@...labora.com>

Acked-by: Andrzej Pietrasiewicz <andrzej.p@...sung.com>

> ---
>   drivers/media/platform/s5p-jpeg/jpeg-core.c | 42 ++++++++++++++++-------------
>   1 file changed, 24 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> index 1769744..0783809 100644
> --- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
> +++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> @@ -1096,6 +1096,29 @@ static void skip(struct s5p_jpeg_buffer *buf, long len)
>   		get_byte(buf);
>   }
>   
> +static bool s5p_jpeg_subsampling_decode(struct s5p_jpeg_ctx *ctx,
> +					unsigned int subsampling)
> +{
> +	switch (subsampling) {
> +	case 0x11:
> +		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444;
> +		break;
> +	case 0x21:
> +		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422;
> +		break;
> +	case 0x22:
> +		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_420;
> +		break;
> +	case 0x33:
> +		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY;
> +		break;
> +	default:
> +		return false;
> +	}
> +
> +	return true;
> +}
> +
>   static bool s5p_jpeg_parse_hdr(struct s5p_jpeg_q_data *result,
>   			       unsigned long buffer, unsigned long size,
>   			       struct s5p_jpeg_ctx *ctx)
> @@ -1207,26 +1230,9 @@ static bool s5p_jpeg_parse_hdr(struct s5p_jpeg_q_data *result,
>   		}
>   	}
>   
> -	if (notfound || !sos)
> +	if (notfound || !sos || !s5p_jpeg_subsampling_decode(ctx, subsampling))
>   		return false;
>   
> -	switch (subsampling) {
> -	case 0x11:
> -		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444;
> -		break;
> -	case 0x21:
> -		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422;
> -		break;
> -	case 0x22:
> -		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_420;
> -		break;
> -	case 0x33:
> -		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY;
> -		break;
> -	default:
> -		return false;
> -	}
> -
>   	result->w = width;
>   	result->h = height;
>   	result->sos = sos;
>