bool Hwcomposer::setPowerMode(int disp, int mode)
{
    RETURN_FALSE_IF_NOT_INIT();

    if (disp < 0 || disp >= IDisplayDevice::DEVICE_COUNT) {
        ELOGTRACE("invalid disp %d", disp);
        return false;
    }

    IDisplayDevice *device = mDisplayDevices.itemAt(disp);
    if (!device) {
        ELOGTRACE("no device found");
        return false;
    }

    return device->setPowerMode(mode);
}