Starting with Haswell, DDI ports can work in FDI mode to support connectivity with the outputs located on the PCH. This commit adds support for such connections in the intel_ddi module, and provides Haswell-specific functionality to make it work. v2: simplify the commit as per Daniel Vetter suggestion. Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>