linux-kernel - Re: [PATCH] media: rcar-vin: Update crop and compose settings for every s

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Date:   Sat, 1 Aug 2020 11:04:56 +0200
From:   Niklas <niklas.soderlund@...natech.se>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH] media: rcar-vin: Update crop and compose settings for
 every s_fmt call

Hi Lad,

Thanks for your work.

On 2020-07-31 10:29:05 +0100, Lad Prabhakar wrote:
> The crop and compose settings for VIN in non mc mode werent updated
> in s_fmt call this resulted in captured images being clipped.
> 
> With the below sequence on the third capture where size is set to
> 640x480 resulted in clipped image of size 320x240.
> 
> high(640x480) -> low (320x240) -> high (640x480)
> 
> This patch makes sure the VIN crop and compose settings are updated.

This is clearly an inconsistency in the VIN driver that should be fixed.  
But I think the none-mc mode implements the correct behavior. That is 
that S_FMT should not modify the crop/compose rectangles other then make 
sure they don't go out of bounds. This is an area we tried to clarify in 
the past but I'm still not sure what the correct answer to.

> 
> Fixes: 104464f573d ("media: rcar-vin: Do not reset the crop and compose rectangles in s_fmt")
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> ---
>  drivers/media/platform/rcar-vin/rcar-v4l2.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> index f421e25..a9b13d9 100644
> --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> @@ -319,6 +319,12 @@ static int rvin_s_fmt_vid_cap(struct file *file, void *priv,
>  	fmt_rect.width = vin->format.width;
>  	fmt_rect.height = vin->format.height;
>  
> +	vin->crop.top = 0;
> +	vin->crop.left = 0;
> +	vin->crop.width = vin->format.width;
> +	vin->crop.height = vin->format.height;
> +	vin->compose = vin->crop;
> +
>  	v4l2_rect_map_inside(&vin->crop, &src_rect);
>  	v4l2_rect_map_inside(&vin->compose, &fmt_rect);
>  	vin->src_rect = src_rect;
> -- 
> 2.7.4
> 

-- 
Regards,
Niklas Söderlund