drm/i915/execlists: Refactor common engine setup
Move all of the constant assignments up front and into a common function. This is primarily to ensure the backpointers are set as early as possible for later use during initialisation. v2: Use a constant struct so that all the similar values are set together. v3: Sanitize the engine's IMR to disable any potential interrupt before we are ready (enabled in init_hw). v4: Ignore the engine's IMR, to be resolved later Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Cc: Dave Gordon <david.s.gordon@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1462545621-30125-2-git-send-email-chris@chris-wilson.co.uk
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