PIPEDMC_FQ_CTRL
intel_de_rmw(display, PIPEDMC_FQ_CTRL(crtc->pipe),
intel_de_write(display, PIPEDMC_FQ_CTRL(pipe), 0);
intel_de_write(display, PIPEDMC_FQ_CTRL(crtc->pipe), PIPEDMC_FQ_CTRL_ENABLE);
intel_de_write(display, PIPEDMC_FQ_CTRL(crtc->pipe), 0);