MPS_INT_CAUSE_A
t4_write_reg(adapter, MPS_INT_CAUSE_A, 0);
t4_read_reg(adapter, MPS_INT_CAUSE_A); /* flush */
csio_wr_reg32(hw, 0, MPS_INT_CAUSE_A);
csio_rd_reg32(hw, MPS_INT_CAUSE_A); /* flush */