DC_DISP_DISP_WIN_OPTIONS_REG
DC_SET_CLEAR(tegra_crtc, DC_DISP_DISP_WIN_OPTIONS_REG,
opt = DC_READ(tegra_crtc, DC_DISP_DISP_WIN_OPTIONS_REG);
DC_WRITE(tegra_crtc, DC_DISP_DISP_WIN_OPTIONS_REG, opt);
opt = DC_READ(tegra_crtc, DC_DISP_DISP_WIN_OPTIONS_REG);
DC_WRITE(tegra_crtc, DC_DISP_DISP_WIN_OPTIONS_REG, opt);