drm/i915/cnl: Add missing type case.
Paulo had noticed that inside cnl_ddi_vswing_program the case was handling voltage but with no indication of type where a missing type could also take us to that path. So my first attempt was to add a message to let clear who trigger that path. However DK had a better idea that is to handle the missed type sooner before it might take to that path. So this v2 here uses his approach. v2: Handle missed type sooner. Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170710205852.28352-1-rodrigo.vivi@intel.com
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