linux-kernel - Re: [PATCH v4 1/5] v4l: Add new Colorimetry Class

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Date:   Mon, 25 Jan 2021 11:09:35 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Ezequiel Garcia <ezequiel@...labora.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>
Subject: Re: [PATCH v4 1/5] v4l: Add new Colorimetry Class

On 20/01/2021 10:26, Stanimir Varbanov wrote:
> Add Colorimetry control class for colorimetry controls
> 
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  drivers/media/v4l2-core/v4l2-ctrls.c | 5 +++++
>  include/uapi/linux/v4l2-controls.h   | 4 ++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index f7b310240af2..a5137a867411 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -1201,6 +1201,10 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_STATELESS_H264_SLICE_PARAMS:		return "H264 Slice Parameters";
>  	case V4L2_CID_STATELESS_H264_DECODE_PARAMS:		return "H264 Decode Parameters";
>  	case V4L2_CID_STATELESS_FWHT_PARAMS:			return "FWHT Stateless Parameters";
> +
> +	/* Colorimetry controls */
> +	/* Keep the order of the 'case's the same as in v4l2-controls.h! */
> +	case V4L2_CID_COLORIMETRY_CLASS:	return "Colorimetry Controls";
>  	default:
>  		return NULL;
>  	}
> @@ -1389,6 +1393,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>  	case V4L2_CID_RF_TUNER_CLASS:
>  	case V4L2_CID_DETECT_CLASS:
>  	case V4L2_CID_CODEC_STATELESS_CLASS:
> +	case V4L2_CID_COLORIMETRY_CLASS:
>  		*type = V4L2_CTRL_TYPE_CTRL_CLASS;
>  		/* You can neither read not write these */

I wouldn't have bothered with this, but since a v5 will be needed in any case:
can you fix the typo in this comment? not -> nor

No need to create a separate patch for this. Just mention in the commit message
that you fixed this typo as well.

Regards,

	Hans

>  		*flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 039c0d7add1b..a41039559193 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -66,6 +66,7 @@
>  #define V4L2_CTRL_CLASS_RF_TUNER	0x00a20000	/* RF tuner controls */
>  #define V4L2_CTRL_CLASS_DETECT		0x00a30000	/* Detection controls */
>  #define V4L2_CTRL_CLASS_CODEC_STATELESS 0x00a40000	/* Stateless codecs controls */
> +#define V4L2_CTRL_CLASS_COLORIMETRY	0x00a50000	/* Colorimetry controls */
>  
>  /* User-class control IDs */
>  
> @@ -1657,6 +1658,9 @@ struct v4l2_ctrl_fwht_params {
>  	__u32 quantization;
>  };
>  
> +#define V4L2_CID_COLORIMETRY_CLASS_BASE	(V4L2_CTRL_CLASS_COLORIMETRY | 0x900)
> +#define V4L2_CID_COLORIMETRY_CLASS	(V4L2_CTRL_CLASS_COLORIMETRY | 1)
> +
>  /* MPEG-compression definitions kept for backwards compatibility */
>  #ifndef __KERNEL__
>  #define V4L2_CTRL_CLASS_MPEG            V4L2_CTRL_CLASS_CODEC
>