drm/i915: Factor out a helper to disable the DPCD training pattern
To prepare for a follow-up LTTPR change factor out a helper to disable the training pattern in DPCD. We'll need to do this for each LTTPR (without programming the port to output the idle pattern) when training in LTTPR non-transparent mode. While at it also move the disable-link-training logic from intel_dp_set_link_train() to intel_dp_stop_link_train(), since the latter is the only user of this. v2: - Move the disable-link-training logic to intel_dp_stop_link_train() (Ville) Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201007170917.1764556-4-imre.deak@intel.com
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