drm/i915: Don't try to calculate RC6 residency on GEN4 and before
intel_enable_rc6() is used to check if we can compute the RC6 residency in the sysfs code. Disable this for platforms older than Ironlake. Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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