Re: [PATCH v1 3/3] media: sun6i-csi: capture: Support MC-centric format enumeration

[Paul Kocialkowski <paulk@sys-base.io>]

[-- Attachment #1: Type: text/plain, Size: 3254 bytes --]

Hi Arash,

Le Tue 17 Feb 26, 10:10, Arash Golgol a écrit :
> Extend vidioc_enum_fmt to support MC-centric enumeration by filtering
> pixel formats based on the provided mbus code. Advertise MC I/O support
> on the video device to reflect its intended usage within a media graph.
> 
> Signed-off-by: Arash Golgol <arash.golgol@gmail.com>
> ---
>  .../sunxi/sun6i-csi/sun6i_csi_capture.c       | 38 +++++++++++++++++--
>  1 file changed, 35 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c
> index dd06d4c116e0..f54d7a6397be 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c
> @@ -327,6 +327,21 @@ static bool sun6i_csi_capture_format_match(u32 pixelformat, u32 mbus_code)
>  	return false;
>  }
>  
> +static const u32 *sun6i_csi_capture_pixelformat_find(u32 mbus_code)

I am not a big fan of returning a pointer here. We can safely assume
that a valid pixel format will be non-zero (it's a fourcc), so I would
just return the pixelformat directly and 0 for invalid cases.

All the best,

Paul

> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(sun6i_csi_capture_format_matches); i++) {
> +		const struct sun6i_csi_capture_format_match *match =
> +			&sun6i_csi_capture_format_matches[i];
> +
> +		if (match->mbus_code == mbus_code)
> +			return &match->pixelformat;
> +	}
> +
> +	return NULL;
> +}
> +
>  /* Capture */
>  
>  static void
> @@ -729,11 +744,27 @@ static int sun6i_csi_capture_enum_fmt(struct file *file, void *priv,
>  				      struct v4l2_fmtdesc *fmtdesc)
>  {
>  	u32 index = fmtdesc->index;
> +	u32 mbus_code = fmtdesc->mbus_code;
> +	const u32 *pixelformat;
> +
> +	/* MC-centric or Video-node-centric */
> +	if (mbus_code) {
> +		/* There is only one pixelformat for a mbus_code. */
> +		if (index)
> +			return -EINVAL;
> +
> +		pixelformat = sun6i_csi_capture_pixelformat_find(mbus_code);
> +	} else {
> +		if (index >= ARRAY_SIZE(sun6i_csi_capture_formats))
> +			return -EINVAL;
> +
> +		pixelformat = &sun6i_csi_capture_formats[index].pixelformat;
> +	}
>  
> -	if (index >= ARRAY_SIZE(sun6i_csi_capture_formats))
> +	if (!pixelformat)
>  		return -EINVAL;
>  
> -	fmtdesc->pixelformat = sun6i_csi_capture_formats[index].pixelformat;
> +	fmtdesc->pixelformat = *pixelformat;
>  
>  	return 0;
>  }
> @@ -1065,7 +1096,8 @@ int sun6i_csi_capture_setup(struct sun6i_csi_device *csi_dev)
>  
>  	strscpy(video_dev->name, SUN6I_CSI_CAPTURE_NAME,
>  		sizeof(video_dev->name));
> -	video_dev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +	video_dev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
> +				 V4L2_CAP_IO_MC;
>  	video_dev->vfl_dir = VFL_DIR_RX;
>  	video_dev->release = video_device_release_empty;
>  	video_dev->fops = &sun6i_csi_capture_fops;
> -- 
> 2.34.1
> 

-- 
Paul Kocialkowski,

Independent contractor - sys-base - https://www.sys-base.io/
Free software developer - https://www.paulk.fr/

Expert in multimedia, graphics and embedded hardware support with Linux.

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]