cxl/hdm: Add debug message for invalid interleave granularity

There's no debug message for invalid interleave granularity.  This
makes it hard to debug related bugs.  So, this is added in this patch.
Signed-off-by: Huang, Ying <ying.huang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240402061016.388408-1-ying.huang@intel.comSigned-off-by: Dave Jiang <dave.jiang@intel.com>

drivers/cxl/core/hdm.c

@@ -888,8 +888,12 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
 	}
 	rc = eig_to_granularity(FIELD_GET(CXL_HDM_DECODER0_CTRL_IG_MASK, ctrl),
 				 &cxld->interleave_granularity);
-	if (rc)
+	if (rc) {
+		dev_warn(&port->dev,
+			 "decoder%d.%d: Invalid interleave granularity (ctrl: %#x)\n",
+			 port->id, cxld->id, ctrl);
 		return rc;
+	}
 
 	dev_dbg(&port->dev, "decoder%d.%d: range: %#llx-%#llx iw: %d ig: %d\n",
 		port->id, cxld->id, cxld->hpa_range.start, cxld->hpa_range.end,