driver core: Set fw_devlink to "permissive" behavior by default

Set fw_devlink to "permissive" behavior by default so that device links
are automatically created (with DL_FLAG_SYNC_STATE_ONLY) by scanning the
firmware.

This ensures suppliers get their sync_state() calls only after all their
consumers have probed successfully. Without this, suppliers will get
their sync_state() calls at late_initcall_sync() even if their consuer

Ideally, we'd want to set fw_devlink to "on" or "rpm" by default. But
that needs more testing as it's known to break some corner case
drivers/platforms.

Cc: Rob Herring <[email protected]>
Cc: Frank Rowand <[email protected]>
Cc: [email protected]
Signed-off-by: Saravana Kannan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Saravana Kannan

drivers/base/core.c

@@ -2345,7 +2345,7 @@ static int device_private_init(struct device *dev)
 	return 0;
 }
 
-static u32 fw_devlink_flags;
+static u32 fw_devlink_flags = DL_FLAG_SYNC_STATE_ONLY;
 static int __init fw_devlink_setup(char *arg)
 {
 	if (!arg)