drm/dp: Add LTTPR helpers
Add the helpers and register definitions needed to read out the common and per-PHY LTTPR capabilities and perform link training in the LTTPR non-transparent mode. v2: - Add drm_dp_dpcd_read_phy_link_status() and DP_PHY_LTTPR() here instead of adding these to i915. (Ville) v3: - Use memmove() to convert LTTPR to DPRX link status format. (Ville) Cc: dri-devel@lists.freedesktop.org Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by:Ville Syrjälä <ville.syrjala@linux.intel.com> Acked-by:
Lyude Paul <lyude@redhat.com> Acked-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201007170917.1764556-5-imre.deak@intel.com
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