cxl/core/port: Fix / relax decoder target enumeration

If the decoder is not presently active the target_list may not be
accurate. Perform a best effort mapping and assume that it will be fixed
up when the decoder is enabled.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/164317464406.3438644.6609329492458460242.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Author: djbw

drivers/cxl/acpi.c

@@ -15,7 +15,7 @@
 
 static unsigned long cfmws_to_decoder_flags(int restrictions)
 {
-	unsigned long flags = 0;
+	unsigned long flags = CXL_DECODER_F_ENABLE;
 
 	if (restrictions & ACPI_CEDT_CFMWS_RESTRICT_TYPE2)
 		flags |= CXL_DECODER_F_TYPE2;

drivers/cxl/core/port.c

@@ -1307,8 +1307,11 @@ int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map)
 	port = to_cxl_port(cxld->dev.parent);
 	if (!is_endpoint_decoder(dev)) {
 		rc = decoder_populate_targets(cxld, port, target_map);
-		if (rc)
+		if (rc && (cxld->flags & CXL_DECODER_F_ENABLE)) {
+			dev_err(&port->dev,
+				"Failed to populate active decoder targets\n");
 			return rc;
+		}
 	}
 
 	rc = dev_set_name(dev, "decoder%d.%d", port->id, cxld->id);