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drm/i915/skl: Restore pipe interrupt registers after power well enabling
The pipe interrupt registers are in the actual pipe power well, so we need to restore them when re-enable the corresponding power well. I've also copied what we do on HSW/BDW for VGA, even if the we haven't enabled unclaimed registers just yet. v2: Don't run skl_power_well_post_enable() if the power well is already enabled (Paulo) 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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