[PATCH 06/13] drm/dp_mst: Add helpers for MST DSC and virtual DPCD aux

From: David Francis Add drm_dp_mst_dsc_aux_for_port. To enable DSC, the DSC_ENABLED register might have to be written on the leaf port's DPCD, its parent's DPCD, or the MST manager's DPCD. This function finds the correct aux for the job. As part of this, add drm_dp_mst_is_virtual_dpcd. Virtual D

[PATCH 06/13] drm/dp_mst: Add helpers for MST DSC and virtual DPCD aux

From: David Francis Add drm_dp_mst_dsc_aux_for_port. To enable DSC, the DSC_ENABLED register might have to be written on the leaf port's DPCD, its parent's DPCD, or the MST manager's DPCD. This function finds the correct aux for the job. As part of this, add drm_dp_mst_is_virtual_dpcd. Virtual D