linux-kernel - Re: [PATCH v5 4/4] media: uvcvideo: Auto-set UVC_QUIRK_MSXU

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Message-ID: <c8d83994-603d-4d25-aa25-e9a893692fea@redhat.com>
Date: Mon, 26 May 2025 15:19:16 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Ricardo Ribalda <ribalda@...omium.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Guennadi Liakhovetski <guennadi.liakhovetski@...el.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/4] media: uvcvideo: Auto-set UVC_QUIRK_MSXU_META

Hi,

On 4-Apr-25 08:37, Ricardo Ribalda wrote:
> If the camera supports the MSXU_CONTROL_METADATA control, auto set the
> MSXU_META quirk.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hansg@...nel.org>

Regards,

Hans



> ---
>  drivers/media/usb/uvc/uvc_metadata.c | 54 ++++++++++++++++++++++++++++++++++++
>  include/linux/usb/uvc.h              |  3 ++
>  2 files changed, 57 insertions(+)
> 
> diff --git a/drivers/media/usb/uvc/uvc_metadata.c b/drivers/media/usb/uvc/uvc_metadata.c
> index fe2678fc795d7fd5a64e8113199012f34c419176..776d280f34afad515594a873acf075acf0438304 100644
> --- a/drivers/media/usb/uvc/uvc_metadata.c
> +++ b/drivers/media/usb/uvc/uvc_metadata.c
> @@ -10,6 +10,7 @@
>  #include <linux/list.h>
>  #include <linux/module.h>
>  #include <linux/usb.h>
> +#include <linux/usb/uvc.h>
>  #include <linux/videodev2.h>
>  
>  #include <media/v4l2-ioctl.h>
> @@ -187,11 +188,64 @@ static const struct v4l2_file_operations uvc_meta_fops = {
>  	.mmap = vb2_fop_mmap,
>  };
>  
> +static const u8 uvc_msxu_guid[16] = UVC_GUID_MSXU_1_5;
> +
> +#define MSXU_CONTROL_METADATA 0x9
> +static int uvc_enable_msxu(struct uvc_device *dev)
> +{
> +	u32 *data __free(kfree) = NULL;
> +	struct uvc_entity *entity;
> +
> +	list_for_each_entry(entity, &dev->entities, list) {
> +		int ret;
> +
> +		if (memcmp(entity->guid, uvc_msxu_guid, sizeof(entity->guid)))
> +			continue;
> +
> +		if (!data)
> +			data = kmalloc(sizeof(*data), GFP_KERNEL);
> +		if (!data)
> +			return -ENOMEM;
> +
> +		ret = uvc_query_ctrl(dev, UVC_GET_CUR, entity->id,
> +				     dev->intfnum, MSXU_CONTROL_METADATA,
> +				     data, sizeof(*data));
> +		if (ret)
> +			continue;
> +
> +		if (*data) {
> +			dev->quirks |= UVC_QUIRK_MSXU_META;
> +			return 0;
> +		}
> +
> +		ret = uvc_query_ctrl(dev, UVC_GET_MAX, entity->id,
> +				     dev->intfnum, MSXU_CONTROL_METADATA,
> +				     data, sizeof(*data));
> +		if (ret || !*data)
> +			continue;
> +
> +		ret = uvc_query_ctrl(dev, UVC_SET_CUR, entity->id,
> +				     dev->intfnum, MSXU_CONTROL_METADATA,
> +				     data, sizeof(*data));
> +		if (!ret) {
> +			dev->quirks |= UVC_QUIRK_MSXU_META;
> +			return 0;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>  int uvc_meta_register(struct uvc_streaming *stream)
>  {
>  	struct uvc_device *dev = stream->dev;
>  	struct video_device *vdev = &stream->meta.vdev;
>  	struct uvc_video_queue *queue = &stream->meta.queue;
> +	int ret;
> +
> +	ret = uvc_enable_msxu(dev);
> +	if (ret)
> +		return ret;
>  
>  	stream->meta.format = V4L2_META_FMT_UVC;
>  
> diff --git a/include/linux/usb/uvc.h b/include/linux/usb/uvc.h
> index bce95153e5a65613a710d7316fc17cf5462b5bce..ee19e9f915b8370c333c426dc1ee4202c7b75c5b 100644
> --- a/include/linux/usb/uvc.h
> +++ b/include/linux/usb/uvc.h
> @@ -29,6 +29,9 @@
>  #define UVC_GUID_EXT_GPIO_CONTROLLER \
>  	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
>  	 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03}
> +#define UVC_GUID_MSXU_1_5 \
> +	{0xdc, 0x95, 0x3f, 0x0f, 0x32, 0x26, 0x4e, 0x4c, \
> +	 0x92, 0xc9, 0xa0, 0x47, 0x82, 0xf4, 0x3b, 0xc8}
>  
>  #define UVC_GUID_FORMAT_MJPEG \
>  	{ 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
>