THC_POINTER_WRAPAROUND
ctrl = FIELD_PREP(THC_M_PRT_READ_DMA_CNTRL_TPCWP, THC_POINTER_WRAPAROUND) | mbits;
dma_set_write_pointer(dev, THC_POINTER_WRAPAROUND, read_config);
ctrl = FIELD_PREP(THC_M_PRT_READ_DMA_CNTRL_TPCWP, THC_POINTER_WRAPAROUND) | mbits;