drm/i915/bxt: Don't reprogram an already enabled DDI PHY
If BIOS has already programmed and enabled a PHY, don't reprogram it as that may interfere with the currently active outputs. A follow-up patch will add state verification, so we can catch any misconfiguration on BIOS's behalf. Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1459515767-29228-14-git-send-email-imre.deak@intel.com
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