drm_dp_dpcd_access
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset, &buffer, 1);
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset,
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_WRITE, offset,