EDAC/ie31200: Fold the two channel loops into one loop

Fold the two channel loops to simplify the code and improve readability.
Also, delete the comments related to the DRB register, as this register
is not used here.

 No functional changes intended.

Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Tested-by: Gary Wang <gary.c.wang@intel.com>
Link: https://lore.kernel.org/r/20250310011411.31685-9-qiuxu.zhuo@intel.com

drivers/edac/ie31200_edac.c

@@ -339,7 +339,7 @@ static int ie31200_probe1(struct pci_dev *pdev, struct res_config *cfg)
 	struct edac_mc_layer layers[2];
 	void __iomem *window;
 	struct ie31200_priv *priv;
-	u32 addr_decode[IE31200_CHANNELS];
+	u32 addr_decode;
 
 	edac_dbg(0, "MC:\n");
 
@@ -383,25 +383,17 @@ static int ie31200_probe1(struct pci_dev *pdev, struct res_config *cfg)
 	priv->cfg = cfg;
 
 	for (i = 0; i < IE31200_CHANNELS; i++) {
-		addr_decode[i] = readl(window + cfg->reg_mad_dimm_offset[i]);
-		edac_dbg(0, "addr_decode: 0x%x\n", addr_decode[i]);
-	}
+		addr_decode = readl(window + cfg->reg_mad_dimm_offset[i]);
+		edac_dbg(0, "addr_decode: 0x%x\n", addr_decode);
 
-	/*
-	 * The dram rank boundary (DRB) reg values are boundary addresses
-	 * for each DRAM rank with a granularity of 64MB.  DRB regs are
-	 * cumulative; the last one will contain the total memory
-	 * contained in all ranks.
-	 */
-	for (i = 0; i < IE31200_DIMMS_PER_CHANNEL; i++) {
-		for (j = 0; j < IE31200_CHANNELS; j++) {
+		for (j = 0; j < IE31200_DIMMS_PER_CHANNEL; j++) {
 			struct dimm_data dimm_info;
 			struct dimm_info *dimm;
 			unsigned long nr_pages;
 
-			populate_dimm_info(&dimm_info, addr_decode[j], i, cfg);
+			populate_dimm_info(&dimm_info, addr_decode, j, cfg);
 			edac_dbg(0, "channel: %d, dimm: %d, size: %lld MiB, ranks: %d, DRAM chip type: %d\n",
-				 j, i, dimm_info.size >> 20,
+				 i, j, dimm_info.size >> 20,
 				 dimm_info.ranks,
 				 dimm_info.dtype);
 
@@ -411,7 +403,7 @@ static int ie31200_probe1(struct pci_dev *pdev, struct res_config *cfg)
 
 			nr_pages = nr_pages / dimm_info.ranks;
 			for (k = 0; k < dimm_info.ranks; k++) {
-				dimm = edac_get_dimm(mci, (i * dimm_info.ranks) + k, j, 0);
+				dimm = edac_get_dimm(mci, (j * dimm_info.ranks) + k, i, 0);
 				dimm->nr_pages = nr_pages;
 				edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
 				dimm->grain = 8; /* just a guess */