drm/i915/gt: Avoid using tag 0 for the very first submission
Assume that the HW starts off with tag 0 "active" and so avoid using tag 0 for our own first ELSP submission. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191229183153.3719869-2-chris@chris-wilson.co.uk
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