drm/i915: fix Haswell pfit power well check v2
We can't read the pfit regs if the power well is off, so use the cached value. v2: re-add lost comment (Jesse) make sure the crtc using the fitter is actually enabled (Jesse) Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> [danvet: Drop now unused dev_priv, as spotted by Mika.] Reviewed-by: NMika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Tested-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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