DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE
backlight_enable |= DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE;
if (backlight_enable & DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE) {
backlight_enable &= ~DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE;
dpcd_buf |= DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE;