Rework adapter detection logiclamprey_12.1.9lamprey_12.1.8lamprey_12.1.7lamprey_12.1.6lamprey_12.1.5lamprey_12.1.4lamprey_12.1.3lamprey_12.1.2lamprey_12.1.19lamprey_12.1.18lamprey_12.1.17lamprey_12.1.16lamprey_12.1.15lamprey_12.1.14lamprey_12.1.13lamprey_12.1.12lamprey_12.1.11lamprey_12.1.10lamprey_12.1.1lamprey_12.1.0lamprey/12.1.9lamprey/12.1.8lamprey/12.1.7lamprey/12.1.6lamprey/12.1.5lamprey/12.1.4lamprey/12.1.3lamprey/12.1.2lamprey/12.1.19lamprey/12.1.18lamprey/12.1.17lamprey/12.1.16lamprey/12.1.15lamprey/12.1.14lamprey/12.1.13lamprey/12.1.12lamprey/12.1.11lamprey/12.1.10lamprey/12.1.1lamprey/12.1.012.1.912.1.812.1.712.1.612.1.512.1.412.1.312.1.212.1.1912.1.1812.1.1712.1.1612.1.1512.1.1412.1.1312.1.1212.1.1112.1.1012.1.112.1.0lamprey

Rework the adapter detection logic in the helper thread to use the
initialization done signal to the main process to indicate that basic
BlueZ D-Bus initialization has completed, then loop forever looking
for an adapter as opposed to just trying once.  This improves the
behavior with hardware such as the TI Wilink chipset or the Broadcom
chipset on Raspberry Pi 4, where the firmware loading delay may
result in the HCI device not actually being available yet when the
binding is started.

Bug-AGL: SPEC-4060

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I1da5c2e3168acd0f8f55dc75c2408647d03c0a4e
(cherry picked from commit c301f67772c2a2c643dd47b2291f0c971f8006ce)

1 files changed, 35 insertions, 21 deletions

diff --git a/binding/bluetooth-api.c b/binding/bluetooth-api.c
index 2bcddd9..5022ba9 100644
--- a/binding/bluetooth-api.c
+++ b/binding/bluetooth-api.c
@@ -651,6 +651,8 @@ static gpointer bluetooth_func(gpointer ptr)
 	struct bluetooth_state *ns;
 	GMainLoop *loop;
 	int rc = 0;
+	unsigned int delay;
+	unsigned int attempt;
 
 	g_atomic_rc_box_acquire(id);
 
@@ -660,7 +662,7 @@ static gpointer bluetooth_func(gpointer ptr)
 		goto err_no_loop;
 	}
 
-	/* real bluetooth init */
+	// Do BlueZ D-Bus related init
 	ns = bluetooth_init(loop);
 	if (!ns) {
 		AFB_ERROR("bluetooth_init() failed");
@@ -668,26 +670,38 @@ static gpointer bluetooth_func(gpointer ptr)
 	}
 
 	id->ns = ns;
-	rc = bluetooth_select_init_adapter(id);
-	if (rc > 0) {
-		rc = bluetooth_register_agent(id);
-		if (rc) {
-			AFB_ERROR("bluetooth_register_agent() failed");
-			goto err_no_service;
-		}
-	}
-	else if (rc < 0) {
-		goto err_no_service;
-	}
-	else {
-		//fake it
-		AFB_INFO("No adapter present, completed initialization");
-		signal_init_done(id, 0);
+	rc = bluetooth_register_agent(id);
+	if (rc) {
+		AFB_ERROR("bluetooth_register_agent() failed");
+		goto err_no_agent;
 	}
-	/* note that we wait for agent registration to signal done */
 
 	afb_api_set_userdata(id->api, ns);
-	g_main_loop_run(loop);
+
+	// Let main process know initialization is done
+	signal_init_done(id, 0);
+
+	// Wait for an adapter to appear
+	rc = 0;
+	delay = 1;
+	attempt = 1;
+	while(rc <= 0) {
+		rc = bluetooth_select_init_adapter(id);
+		if (rc != 0)
+			break;
+
+		// Back off querying rate after the first 60 seconds
+		if (attempt++ == 60)
+			delay = 10;
+
+		sleep(delay);
+	}
+
+	if (rc > 0) {
+		g_main_loop_run(loop);
+	} else {
+		AFB_ERROR("bluetooth_select_init_adapter() failed");
+	}
 
 	g_main_loop_unref(ns->loop);
 
@@ -700,7 +714,7 @@ static gpointer bluetooth_func(gpointer ptr)
 
 	return NULL;
 
-err_no_service:
+err_no_agent:
 	bluetooth_cleanup(ns);
 
 err_no_ns:
@@ -757,8 +771,8 @@ static int init(afb_api_t api)
 	afb_api_call_sync(api, "network-manager", "enable_technology", args, NULL, NULL, NULL);
 
 	global_thread = g_thread_new("agl-service-bluetooth",
-				bluetooth_func,
-				id);
+				     bluetooth_func,
+				     id);
 
 	AFB_INFO("bluetooth-binding waiting for init done");