drm/i915/gvt: cancel virtual vblank timer when no vGPU exists
Stop irq timer for virtual vblank timer emulation if no vGPU exists, otherwise it will keep gvt service thread busy to handle virtual vblank but no use. Reviewed-by: NZhi Wang <zhi.a.wang@intel.com> Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
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