SM501_DC_CRT_CONTROL_ENABLE
ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
enable = (ctrl & SM501_DC_CRT_CONTROL_ENABLE) ? 1 : 0;
control |= SM501_DC_CRT_CONTROL_ENABLE; /* enable CRT plane */