Re: [PATCH RFC 2/5] media: v4l2-subdev: Add new ioctl for connection status

[Sakari Ailus]

Hi Mattijs,

On Thu, Oct 01, 2026 at 02:55:20PM +0200, Mattijs Korpershoek wrote:
> The V4L2 framework has historically assumed that every component of the
> camera pipeline is always present. This is a reasonable assumption for
> integrated cameras in laptops or phones. However, in automotive systems,
> cameras (e.g. rear-view or surround-view) can be damaged or
> disconnected.
> 
> When a camera gets disconnected, userspace cannot detect this and thus
> cannot react (for example, by disabling streaming on a faulty camera).
> 
> Add a new v4l2-subdev ioctl (VIDIOC_SUBDEV_G_CONNECTION_STATUS) that
> drivers can implement to report their connection status.
> 
> Signed-off-by: Mattijs Korpershoek <mkorpershoek@xxxxxxxxxx>

Have you considered using V4L2 controls for this?

-- 
Regards,

Sakari Ailus