drm_dp_dpcd_probe
EXPORT_SYMBOL(drm_dp_dpcd_probe);
ret = drm_dp_dpcd_probe(aux, DP_TRAINING_PATTERN_SET);
err = drm_dp_dpcd_probe(tunnel_iter->aux, DP_DPCD_REV);
if (drm_dp_dpcd_probe(&intel_dp->aux,
int drm_dp_dpcd_probe(struct drm_dp_aux *aux, unsigned int offset);