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Prior to gen6 we didn't have per-ring IMR registers, which means that since commit61ff75ac20("drm/i915: Simplify enabling user-interrupts with L3-remapping") we're now masking off all interrupts when init_render_ring() gets called. That's rather rude. Let's limit the ring IMR frobbing to machines that actually have the per-ring IMR registers. Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Fixes:61ff75ac20("drm/i915: Simplify enabling user-interrupts with L3-remapping") Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1468340687-3596-1-git-send-email-ville.syrjala@linux.intel.com Reviewd-by: Chris Wilson <chris@chris-wilson.co.uk>