drm/i915/skl: Restore the DDI translation tables when enabling PW1
I was dumping the DDI translation tables to make sure my patch updating
the HDMI entry was doing the right thing when I noticed that the table
was showing reset values after DPMS.
And indeed, the DDI translation registers are in power well 1 on SKL,
and so we're losing their values when shutting down eDP.
Calling intel_prepare_ddi() on PW1 enabling re-programs the table.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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