MAC_CTRL_DBG_TX_BKPRESURE
#define MAC_CTRL_DBG_TX_BKPRESURE BIT(22)
#define MAC_CTRL_DBG_TX_BKPRESURE 0x400000 /* 1: transmit maximum backoff (half-duplex test bit) */
#define MAC_CTRL_DBG_TX_BKPRESURE 0x400000
#define MAC_CTRL_DBG_TX_BKPRESURE 0x100000 /* 1: TX max backoff */