return -EINVAL;
 }
 
-static int sdr_working_phase(uint32_t grp,
-                             uint32_t dtaps_per_ptap, uint32_t *work_bgn,
-                             uint32_t *v, uint32_t *d, uint32_t *p,
-                             uint32_t *i)
+static int sdr_working_phase(uint32_t grp, uint32_t *work_bgn,
+                            uint32_t *v, uint32_t *d, uint32_t *p,
+                            uint32_t *i)
 {
+       const u32 dtaps_per_ptap = IO_DELAY_PER_OPA_TAP /
+                                  IO_DELAY_PER_DQS_EN_DCHAIN_TAP;
        int ret;
 
        *work_bgn = 0;
        /* ******************************************************** */
        /* * step 2: find first working phase, increment in ptaps * */
        work_bgn = 0;
-       if (sdr_working_phase(grp, dtaps_per_ptap, &work_bgn, &v, &d, &p, &i))
+       if (sdr_working_phase(grp, &work_bgn, &v, &d, &p, &i))
                return 0;
 
        work_end = work_bgn;