drm/udl: Implement page_flip ioctl
This is a very crude page_flip implementation for UDL. There are ways to make it better (make it asynchronous, make it do actual vsynced flips...) but that's for another patch. [airlied: fixup primary change] Signed-off-by: Stéphane Marchesin <marcheu@chromium.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
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