CSR_INT_PERIODIC_ENA  174 drivers/net/wireless/intel/iwlegacy/csr.h #define CSR_INT_PERIODIC_ENA			(0xFF)	/* 255*32 usec ~ 8 msec */
CSR_INT_PERIODIC_ENA  210 drivers/net/wireless/intel/iwlwifi/iwl-csr.h #define CSR_INT_PERIODIC_ENA			(0xFF) /* 255*32 usec ~ 8 msec*/