Re: [PATCH v2] media: rcar-vin: Implement VIDIOC_ENUM_FRMSIZES

[Jacopo Mondi <jacopo.mondi@ideasonboard.com>]

Hi Barnabás

On Thu, Oct 01, 2026 at 10:53:04AM +0200, Barnabás Pőcze wrote:
> Currently there is no way for applications to query the available frame
> sizes, so implement `VIDIOC_ENUM_FRMSIZES` based on what is allowed in
> `rvin_format_align()`.
>
> Signed-off-by: Barnabás Pőcze <barnabas.pocze+renesas@ideasonboard.com>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

> ---
> changes in v2:
>   * drop ` from title
>
> v1: https://lore.kernel.org/linux-media/20260929133720.344955-1-barnabas.pocze+renesas@ideasonboard.com/
> ---
>  .../platform/renesas/rcar-vin/rcar-v4l2.c     | 70 ++++++++++++++-----
>  1 file changed, 51 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c b/drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c
> index 9d45e11898c13..4961d28f42c78 100644
> --- a/drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c
> +++ b/drivers/media/platform/renesas/rcar-vin/rcar-v4l2.c
> @@ -19,6 +19,8 @@
>  #include "rcar-vin.h"
>
>  #define RVIN_DEFAULT_FORMAT	V4L2_PIX_FMT_YUYV
> +#define RVIN_MIN_WIDTH		5
> +#define RVIN_MIN_HEIGHT		2
>  #define RVIN_DEFAULT_WIDTH	800
>  #define RVIN_DEFAULT_HEIGHT	600
>  #define RVIN_DEFAULT_FIELD	V4L2_FIELD_NONE
> @@ -187,6 +189,24 @@ static u32 rvin_format_sizeimage(struct v4l2_pix_format *pix)
>  	}
>  }
>
> +static u32 rvin_format_width_alignment(u32 pixelformat)
> +{
> +	/* Hardware limits width alignment based on format. */
> +	switch (pixelformat) {
> +	/* Multiple of 32 (2^5) for NV12/16. */
> +	case V4L2_PIX_FMT_NV12:
> +	case V4L2_PIX_FMT_NV16:
> +		return 5;
> +	/* Multiple of 2 (2^1) for YUV. */
> +	case V4L2_PIX_FMT_YUYV:
> +	case V4L2_PIX_FMT_UYVY:
> +		return 1;
> +	/* No multiple for RGB. */
> +	default:
> +		return 0;
> +	}
> +}
> +
>  static void rvin_format_align(struct rvin_dev *vin, struct v4l2_pix_format *pix)
>  {
>  	u32 walign;
> @@ -208,27 +228,12 @@ static void rvin_format_align(struct rvin_dev *vin, struct v4l2_pix_format *pix)
>  		break;
>  	}
>
> -	/* Hardware limits width alignment based on format. */
> -	switch (pix->pixelformat) {
> -	/* Multiple of 32 (2^5) for NV12/16. */
> -	case V4L2_PIX_FMT_NV12:
> -	case V4L2_PIX_FMT_NV16:
> -		walign = 5;
> -		break;
> -	/* Multiple of 2 (2^1) for YUV. */
> -	case V4L2_PIX_FMT_YUYV:
> -	case V4L2_PIX_FMT_UYVY:
> -		walign = 1;
> -		break;
> -	/* No multiple for RGB. */
> -	default:
> -		walign = 0;
> -		break;
> -	}
> +	walign = rvin_format_width_alignment(pix->pixelformat);
>
>  	/* Limit to VIN capabilities */
> -	v4l_bound_align_image(&pix->width, 5, vin->info->max_width, walign,
> -			      &pix->height, 2, vin->info->max_height, 0, 0);
> +	v4l_bound_align_image(&pix->width, RVIN_MIN_WIDTH, vin->info->max_width, walign,
> +			      &pix->height, RVIN_MIN_HEIGHT, vin->info->max_height, 0,
> +			      0);
>
>  	pix->bytesperline = rvin_format_bytesperline(vin, pix);
>  	pix->sizeimage = rvin_format_sizeimage(pix);
> @@ -343,6 +348,32 @@ static int rvin_enum_fmt_vid_cap(struct file *file, void *priv,
>  	return -EINVAL;
>  }
>
> +static int rvin_enum_framesizes(struct file *file, void *priv,
> +				struct v4l2_frmsizeenum *fsize)
> +{
> +	struct rvin_dev *vin = video_drvdata(file);
> +	u32 wstep;
> +
> +	if (fsize->index != 0)
> +		return -EINVAL;
> +
> +	if (!rvin_format_from_pixel(vin, fsize->pixel_format))
> +		return -EINVAL;
> +
> +	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
> +
> +	wstep = 1u << rvin_format_width_alignment(fsize->pixel_format);
> +	fsize->stepwise.min_width = round_up(RVIN_MIN_WIDTH, wstep);
> +	fsize->stepwise.max_width = vin->info->max_width;
> +	fsize->stepwise.step_width = wstep;
> +
> +	fsize->stepwise.min_height = RVIN_MIN_HEIGHT;
> +	fsize->stepwise.max_height = vin->info->max_height;
> +	fsize->stepwise.step_height = 1;
> +
> +	return 0;
> +}
> +
>  static int rvin_remote_rectangle(struct rvin_dev *vin, struct v4l2_rect *rect)
>  {
>  	struct media_pad *pad = media_pad_remote_pad_first(&vin->pad);
> @@ -564,6 +595,7 @@ static const struct v4l2_ioctl_ops rvin_mc_ioctl_ops = {
>  	.vidioc_g_fmt_vid_cap		= rvin_g_fmt_vid_cap,
>  	.vidioc_s_fmt_vid_cap		= rvin_mc_s_fmt_vid_cap,
>  	.vidioc_enum_fmt_vid_cap	= rvin_enum_fmt_vid_cap,
> +	.vidioc_enum_framesizes		= rvin_enum_framesizes,
>
>  	.vidioc_g_selection		= rvin_g_selection,
>  	.vidioc_s_selection		= rvin_s_selection,
> --
> 2.55.0
>
>