modules: hal_silabs: Always allocate a connection for PAwR responses

The Silicon Labs Link Layer allocates a connection context when PAwR
with response discovers an advertiser to synchronize with.

Since this procedure currently relies on connection resources, ensure
that at least one connection is configured whenever PAwR responses are
enabled.

Upstream-status: available
Signed-off-by: Petri Pitkanen <petri.pitkanen@silabs.com>
(cherry picked from commit e9682ef)

Author: petrip-slab

modules/hal_silabs/simplicity_sdk/config/ll/sl_bluetooth_connection_config.h

@@ -10,6 +10,10 @@
 #ifndef SL_BT_CONNECTION_CONFIG_H
 #define SL_BT_CONNECTION_CONFIG_H
 
+#if defined(CONFIG_BT_MAX_CONN)
 #define SL_BT_CONFIG_MAX_CONNECTIONS CONFIG_BT_MAX_CONN
+#elif defined(CONFIG_BT_PER_ADV_SYNC)
+#define SL_BT_CONFIG_MAX_CONNECTIONS 1
+#endif
 
 #endif

modules/hal_silabs/simplicity_sdk/config/ll/sl_btctrl_config.h

@@ -36,7 +36,10 @@
 #define SL_CATALOG_BLUETOOTH_FEATURE_CIS_PRESENT
 #endif
 
-#ifdef CONFIG_BT_CONN
+/* The following dependency on PER_ADV_SYNC_RSP is due to the link layer
+ * always reserving a connection when attempting sync with response.
+ */
+#if defined(CONFIG_BT_CONN) || defined(CONFIG_BT_PER_ADV_SYNC_RSP)
 #define SL_CATALOG_BLUETOOTH_FEATURE_CONNECTION_PRESENT
 #endif
 
@@ -69,7 +72,7 @@
 
 #ifdef CONFIG_BT_PER_ADV_RSP
 #define SL_CATALOG_BLUETOOTH_FEATURE_PAWR_ADVERTISER_PRESENT
-#ifdef CONFIG_BT_CONN
+#if defined(CONFIG_BT_CONN) || defined(CONFIG_BT_PER_ADV_SYNC_RSP)
 #define SL_CATALOG_BLUETOOTH_FEATURE_CONNECTION_PAWR_SCHEDULING_PRESENT
 #endif
 #endif