LCD_WINCTRL2_DBM
val = lcd->window[plane].winctrl2 & ~(LCD_WINCTRL2_DBM);
val |= ((pdata->double_buffer_mode << 23) & LCD_WINCTRL2_DBM);
pdata->double_buffer_mode = (lcd->window[plane].winctrl2 & LCD_WINCTRL2_DBM) >> 23;
| LCD_WINCTRL2_DBM