M_CAN_CCCR
cccr = m_can_read(cdev, M_CAN_CCCR);
m_can_write(cdev, M_CAN_CCCR, cccr);
cccr = m_can_read(cdev, M_CAN_CCCR);
m_can_write(cdev, M_CAN_CCCR, cccr);
u32 val_before = m_can_read(cdev, M_CAN_CCCR);
m_can_write(cdev, M_CAN_CCCR, val_after);
val_read = m_can_read(cdev, M_CAN_CCCR) & ~(CCCR_CSR | CCCR_CSA);