FW2X_MPI_CONTROL_REG
mpi_ctrl = AQ_READ64_REG(sc, FW2X_MPI_CONTROL_REG);
AQ_WRITE64_REG(sc, FW2X_MPI_CONTROL_REG, mpi_ctrl);
uint64_t mpi_ctrl = AQ_READ64_REG(sc, FW2X_MPI_CONTROL_REG);
uint64_t mpi_ctrl = AQ_READ64_REG(sc, FW2X_MPI_CONTROL_REG);
AQ_WRITE64_REG(sc, FW2X_MPI_CONTROL_REG, mpi_ctrl);
WAIT_FOR((AQ_READ64_REG(sc, FW2X_MPI_CONTROL_REG) & mask) == mpi_ctrl,