WM_LINETIME
intel_de_write(display, WM_LINETIME(crtc->pipe),
tmp = intel_de_read(display, WM_LINETIME(crtc->pipe));
MMIO_D(WM_LINETIME(PIPE_A));
MMIO_D(WM_LINETIME(PIPE_B));
MMIO_D(WM_LINETIME(PIPE_C));