cxl/acpi: Group xor arithmetric setup code in a single block

Simplify the xor arithmetric setup code by grouping it in a single
block. No need to split the block for QoS setup.

It is safe to reorder the call of cxl_setup_extended_linear_cache()
because there are no dependencies.

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
Tested-by: Gregory Price <gourry@gourry.net>
Link: https://patch.msgid.link/20251114075844.1315805-3-rrichter@amd.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Author: Robert Richter

drivers/cxl/acpi.c

@@ -453,8 +453,6 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws,
 		ig = CXL_DECODER_MIN_GRANULARITY;
 	cxld->interleave_granularity = ig;
 
-	cxl_setup_extended_linear_cache(cxlrd);
-
 	if (cfmws->interleave_arithmetic == ACPI_CEDT_CFMWS_ARITHMETIC_XOR) {
 		if (ways != 1 && ways != 3) {
 			cxims_ctx = (struct cxl_cxims_context) {
@@ -470,15 +468,14 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws,
 				return -EINVAL;
 			}
 		}
-	}
-
-	cxlrd->qos_class = cfmws->qtg_id;
-
-	if (cfmws->interleave_arithmetic == ACPI_CEDT_CFMWS_ARITHMETIC_XOR) {
 		cxlrd->ops.hpa_to_spa = cxl_apply_xor_maps;
 		cxlrd->ops.spa_to_hpa = cxl_apply_xor_maps;
 	}
 
+	cxl_setup_extended_linear_cache(cxlrd);
+
+	cxlrd->qos_class = cfmws->qtg_id;
+
 	rc = cxl_decoder_add(cxld);
 	if (rc)
 		return rc;