This things just won't die (libva!!!), so add an option to test them.
_Not_ meant to test snoopable mappings.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This seems to be another trick to massively improve correctness
of the render blit. At least on my i945.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Of all the things I've tried, this seems to be the only thing
to fix tile corruptions reliably on gen2&gen3 (safe for outright
disabling the render copy).
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
