CTR1_DDW_LOG2
u32 ddw = 1 << FIELD_GET(CTR1_DDW_LOG2, ctr1);
_ctr1 |= FIELD_PREP(CTR1_DDW_LOG2, ilog2(ddw));
_ctr1 |= FIELD_PREP(CTR1_DDW_LOG2, ilog2(ddw));
_ctr1 |= FIELD_PREP(CTR1_DDW_LOG2, ilog2(ddw));
fifol = FIELD_GET(CSR_FIFOL, csr) * (1 << FIELD_GET(CTR1_DDW_LOG2, hwdesc->ctr1));