drm/i915/gt: Avoid using the GPU before initialisation
Mark the GT as wedged so that we are not tempted to use it prior to initialisation. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Andi Shyti <andi.shyti@intel.com> Reviewed-by: NMatthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191229183153.3719869-3-chris@chris-wilson.co.uk
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