drm/i915: Align vswing sequences with old ddi buffer registers.
Vswing sequences on BXT and CNL are equivalent to the ddi buffer registers setting on other platforms. For some reason it got aligned with skl_ddi_set_iboost what is semantically incorrect. This forced us to keep skipping ddi buffer translation tables on the platforms that has the vswing sequences. v2: Don't mess with DP signal levels on this patch. Cc: Vandana Kannan <vandana.kannan@intel.com> Cc: Imre Deak <imre.deak@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170829232230.23051-3-rodrigo.vivi@intel.com
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