[Intel-gfx] [PATCH v3 3/9] drm: Add Content Protection property

[Chris Wilson]

Quoting Daniel Vetter (2017-12-05 15:34:36)
> Two bits missing imo:
> - Should explain that userspace should poll this property to detect a
>   change from ENABLED to DESIRED (and take adequate actions and e.g. stop
>   the stream). No uevent will be sent out because the HDCP specs require
>   polling anyway.

What's more polling than poll()? :-p
-Chris