drm/i915: don't try to find crtcs for FBC if it's disabled
.. because it would be a waste of time, so move the place where the check is done. Also, with this we won't risk printing "more than one pipe active, disabling compression" or "no output, disabling" when FBC is actually disabled. This patch also represents a small behavior difference when using i915.powersave=0: it is now exactly the same as i915.enable_fbc=0 on this part of the code. V2: Rebase. Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> (v1) Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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