drm/i915/dp: move intel_dp_prepare_link_train() call

Call it from the higher level function, as it will be shared between two
code paths.

Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c0fffbf7213c09e42be9875d38d3001e0026b063.1643878928.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_dp_link_training.c

@@ -1083,8 +1083,6 @@ intel_dp_link_train_all_phys(struct intel_dp *intel_dp,
 	bool ret = true;
 	int i;
 
-	intel_dp_prepare_link_train(intel_dp, crtc_state);
-
 	for (i = lttpr_count - 1; i >= 0; i--) {
 		enum drm_dp_phy dp_phy = DP_PHY_LTTPR(i);
 
@@ -1127,6 +1125,8 @@ void intel_dp_start_link_train(struct intel_dp *intel_dp,
 		/* Still continue with enabling the port and link training. */
 		lttpr_count = 0;
 
+	intel_dp_prepare_link_train(intel_dp, crtc_state);
+
 	if (!intel_dp_link_train_all_phys(intel_dp, crtc_state, lttpr_count))
 		intel_dp_schedule_fallback_link_training(intel_dp, crtc_state);
 }