drm/i915/tgl: add support to one DP-MST stream
This is the minimum change to support 1 (and only 1) DP-MST monitor connected on Tiger Lake. This change was isolated from previous patch from José. In order to support more streams we will need to create a master-slave relation on the transcoders and that is not currently working yet. v2: remove unused macro and use REG_FIELD_PREP() (Ville) Signed-off-by:Lucas De Marchi <lucas.demarchi@intel.com> Reviewed-by:
José Roberto de Souza <jose.souza@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191029035049.5907-1-lucas.demarchi@intel.com
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