via_set_sync_polarity
via_set_sync_polarity(devices, get_sync(&viafbinfo->var));
via_set_sync_polarity(viaparinfo->shared->iga1_devices,
via_set_sync_polarity(viaparinfo->shared->iga2_devices,
void via_set_sync_polarity(u32 devices, u8 polarity);