A_MC4_BIST_OP
t1_write_reg_4(adapter, A_MC4_BIST_OP, V_OP(1) | 0x1f0);
(void) t1_read_reg_4(adapter, A_MC4_BIST_OP); /* flush */
val = t1_read_reg_4(adapter, A_MC4_BIST_OP);