linux-kernel - Re: [PATCH v2 10/12] staging: media: rkvdec: Wrapper for pixel format preparation

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Date:   Mon, 16 Jan 2023 11:42:15 +0100
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     Sebastian Fricke <sebastian.fricke@...labora.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        Jonas Karlman <jonas@...boo.se>,
        Alex Bee <knaerzche@...il.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Collabora Kernel-domain <kernel@...labora.com>,
        Robert Beckett <bob.beckett@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: Re: [PATCH v2 10/12] staging: media: rkvdec: Wrapper for pixel format
 preparation

Hi Sebastian,

W dniu 12.01.2023 o 13:56, Sebastian Fricke pisze:
> Reduce code duplication by creating a wrapper around the preparation of
> the `v4l2_pix_format_mplane` structure and the calculation of the
> image size.
> 
> Signed-off-by: Sebastian Fricke <sebastian.fricke@...labora.com>
> ---
>   drivers/staging/media/rkvdec/rkvdec.c | 29 +++++++++++++++--------------
>   1 file changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index 8d948bcc4e46..b303c6e0286d 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c
> @@ -27,6 +27,17 @@
>   #include "rkvdec.h"
>   #include "rkvdec-regs.h"
>   
> +static void rkvdec_fill_decoded_pixfmt(struct rkvdec_ctx *ctx,
> +				       struct v4l2_pix_format_mplane *pix_mp)
> +{
> +	v4l2_fill_pixfmt_mp(pix_mp, pix_mp->pixelformat,
> +			    pix_mp->width, pix_mp->height);
> +	pix_mp->plane_fmt[0].sizeimage += 128 *
> +		DIV_ROUND_UP(pix_mp->width, 16) *
> +		DIV_ROUND_UP(pix_mp->height, 16);
> +	pix_mp->field = V4L2_FIELD_NONE;
> +}
> +
>   static int rkvdec_queue_busy(struct rkvdec_ctx *ctx, enum v4l2_buf_type buf_type)
>   {
>   	struct vb2_queue *vq;
> @@ -248,13 +259,9 @@ static void rkvdec_reset_decoded_fmt(struct rkvdec_ctx *ctx)
>   
>   	rkvdec_reset_fmt(ctx, f, valid_fmt);
>   	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> -	v4l2_fill_pixfmt_mp(&f->fmt.pix_mp,
> -			    ctx->coded_fmt_desc->decoded_fmts[0],
> -			    ctx->coded_fmt.fmt.pix_mp.width,
> -			    ctx->coded_fmt.fmt.pix_mp.height);
> -	f->fmt.pix_mp.plane_fmt[0].sizeimage += 128 *
> -		DIV_ROUND_UP(f->fmt.pix_mp.width, 16) *
> -		DIV_ROUND_UP(f->fmt.pix_mp.height, 16);
> +	f->fmt.pix_mp.width = ctx->coded_fmt.fmt.pix_mp.width;
> +	f->fmt.pix_mp.height = ctx->coded_fmt.fmt.pix_mp.height;
> +	rkvdec_fill_decoded_pixfmt(ctx, &f->fmt.pix_mp);

Strictly technically this function has _not_ been setting pix_mt->field
to V4L2_FIELD_NONE, but after this change there exists such a "side effect".
Maybe it is actually desired, or maybe it being missing in the not patched
version was a mistake in the first place. Just letting you know so that
you can make sure pix_mp->field being actually set now is ok in the context
of rkvdec_queue_busy().

Regards,

Andrzej

>   }
>   
>   static int rkvdec_enum_framesizes(struct file *file, void *priv,
> @@ -324,13 +331,7 @@ static int rkvdec_try_capture_fmt(struct file *file, void *priv,
>   				       &pix_mp->height,
>   				       &coded_desc->frmsize);
>   
> -	v4l2_fill_pixfmt_mp(pix_mp, pix_mp->pixelformat,
> -			    pix_mp->width, pix_mp->height);
> -	pix_mp->plane_fmt[0].sizeimage +=
> -		128 *
> -		DIV_ROUND_UP(pix_mp->width, 16) *
> -		DIV_ROUND_UP(pix_mp->height, 16);
> -	pix_mp->field = V4L2_FIELD_NONE;
> +	rkvdec_fill_decoded_pixfmt(ctx, pix_mp);
>   
>   	return 0;
>   }
>