In case the driver supports VSync control feature, it
maintains timer for VSync interrupt indication.
In further commits this timer will be started upon
class driver request. The interrupt notification and
related DPC do not access device registers.
Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>
db40bfd439