TRANS_DP2_CTL
intel_de_write(display, TRANS_DP2_CTL(cpu_transcoder), val);
intel_de_rmw(display, TRANS_DP2_CTL(intel_dp->psr.transcoder), 0,
intel_de_rmw(display, TRANS_DP2_CTL(intel_dp->psr.transcoder),
val = intel_de_read(display, TRANS_DP2_CTL(cpu_transcoder));