On Tuesday, 16 November 2021 18:00:58 CET Anilkumar Kolli wrote: [...] > @@ -1866,10 +1867,62 @@ static int ath11k_qmi_alloc_target_mem_chunk(struct ath11k_base *ab) > > static int ath11k_qmi_assign_target_mem_chunk(struct ath11k_base *ab) > { > - int i, idx; > + struct device *dev = ab->dev; > + struct device_node *hremote_node = NULL; > + phandle hremote_phandle; > + int i, idx, len, sw, aw, host_ddr_sz; > + u32 *reg, *reg_end; > + u64 start, size; > > for (i = 0, idx = 0; i < ab->qmi.mem_seg_count; i++) { > switch (ab->qmi.target_mem[i].type) { > + case HOST_DDR_REGION_TYPE: > + if (of_property_read_u32(dev->of_node, "memory-region", > + &hremote_phandle)) { > + ath11k_dbg(ab, ATH11K_DBG_QMI, > + "qmi fail to get hremote phandle\n"); > + return 0; > + } > + > + hremote_node = of_find_node_by_phandle(hremote_phandle); > + if (!hremote_node) { > + ath11k_dbg(ab, ATH11K_DBG_QMI, > + "qmi fail to get hremote_node\n"); > + return 0; > + } > + Why aren't you using something like of_address_to_resource? Or some other __of_get_address related function. > + aw = of_n_addr_cells(hremote_node); > + sw = of_n_size_cells(hremote_node); > + > + reg = (unsigned int *)of_get_property(hremote_node, "reg", &len); > + if (!reg) { > + ath11k_dbg(ab, ATH11K_DBG_QMI, > + "qmi fail to get reg from hremote\n"); > + return 0; > + } > + > + reg_end = reg + len / (aw * sw); Why are you multiplying aw with sw? And why are you then dividing len by it? 1. if you calculate (u32 *)x + 1 then then you would increase the address by 4 bytes. 2. for each address + size pair you would have (aw + sw) * 4 bytes 3. len is in bytes So if you want to get the first byte after a full u32 reg buffer then it would be: reg + len / sizeof(u32); If you would want to get the amount of full address+size pairs len / sizeof(u32) / (aw + sw) > + > + do { > + start = of_read_number(reg, aw); > + reg += aw; > + size = of_read_number(reg, sw); > + reg += sw; > + } while (reg < reg_end); What are you trying to achieve with this loop? Kind regards, Sven