Only serialise with the chipset using an mmio if the chipset is
currently active. We expect that any writes into the chipset range will
simply be forgotten until it wakes up.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118184943.2593048-8-chris@chris-wilson.co.uk