linux-kernel - Re: [PATCH v4 1/3] media: rcar-vin: Invalidate pipeline if conversion is not possible on input formats

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Date:   Wed, 13 May 2020 00:26:48 +0200
From:   Niklas <niklas.soderlund@...natech.se>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v4 1/3] media: rcar-vin: Invalidate pipeline if
 conversion is not possible on input formats

Hi Lad,

Thanks for your work.

On 2020-04-15 11:19:06 +0100, Lad Prabhakar wrote:
> Up until now the VIN was capable to convert any of its supported input mbus
> formats to any of it's supported output pixel formats. With the addition of
> RAW formats this is no longer true.

Add blank line.

> This patch invalidates the pipeline by adding a check if given vin input
> format can be converted to supported output pixel format.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

I like this patch I think there is a typo bellow and patch [1] have been 
merged in the media-tree which unfortunately addes one more thing to do 
in this patch. In rvin_enum_fmt_vid_cap() there is a TODO noted for what 
needs to be done. In imagine the fix is simple and the end result would 
look something like this.

    switch (f->mbus_code) {
    case 0:
    case MEDIA_BUS_FMT_YUYV8_1X16:
    case MEDIA_BUS_FMT_UYVY8_1X16:
    case MEDIA_BUS_FMT_UYVY8_2X8:
    case MEDIA_BUS_FMT_UYVY10_2X10:
    case MEDIA_BUS_FMT_RGB888_1X24:
        break;
    case MEDIA_BUS_FMT_SRGGB8_1X8:
        if (f->index)
            return -EINVAL;

        f->pixelformat = V4L2_PIX_FMT_SRGGB8;
        return 0;
    case default:
        return -EINVAL;
    }

1. d5f74a1eff9aef3b ("media: rcar-vin: Make use of V4L2_CAP_IO_MC")

> ---
>  drivers/media/platform/rcar-vin/rcar-dma.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> index 1a30cd036371..48bd9bfc3948 100644
> --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> @@ -1109,13 +1109,17 @@ static int rvin_mc_validate_format(struct rvin_dev *vin, struct v4l2_subdev *sd,
>  	case MEDIA_BUS_FMT_UYVY8_1X16:
>  	case MEDIA_BUS_FMT_UYVY8_2X8:
>  	case MEDIA_BUS_FMT_UYVY10_2X10:
> +		break;
>  	case MEDIA_BUS_FMT_RGB888_1X24:
> -		vin->mbus_code = fmt.format.code;

This is not right is it?

Should you not add a case for MEDIA_BUS_FMT_SRGGB8_1X8 instead of taking 
over MEDIA_BUS_FMT_RGB888_1X24?

> +		if (vin->format.pixelformat != V4L2_PIX_FMT_SRGGB8)
> +			return -EPIPE;
>  		break;
>  	default:
>  		return -EPIPE;
>  	}
>  
> +	vin->mbus_code = fmt.format.code;
> +
>  	switch (fmt.format.field) {
>  	case V4L2_FIELD_TOP:
>  	case V4L2_FIELD_BOTTOM:
> -- 
> 2.20.1
> 

-- 
Regards,
Niklas Söderlund