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LPT/WPT only have PCH transcoder A. Make sure we poke at its chicken register instead of some non-existent register when FDI is being driven by pipe B or C. Cc: Uma Shankar <uma.shankar@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191128182358.14477-1-ville.syrjala@linux.intel.com Reviewed-by: Uma Shankar <uma.shankar@intel.com>