drm/i915: Use vblank_disable_immediate on gen2
The vblank timestamp->counter guesstimator seems to be working sufficiently well, so there's no reason not to disable vblank interrupts ASAP even on gen2. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190322180804.3300-2-ville.syrjala@linux.intel.comAcked-by: NChris Wilson <chris@chris-wilson.co.uk>
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