drivers: bluetooth: hci_nxp_setup: support for bt disable and reinit

- added flag in nxp setup driver to perform HCI controller firmware-
  load and configuration only once. This avoid loading/setting-up
  controller fw on successive bt_init() after bt_disable() call.

Signed-off-by: Nirav Agrawal <[email protected]>

Author: nirav-agrawal

drivers/bluetooth/hci/h4.c

@@ -2,6 +2,7 @@
 
 /*
  * Copyright (c) 2015-2016 Intel Corporation
+ * Copyright 2025 NXP
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -256,8 +257,10 @@ static void rx_thread(void *p1, void *p2, void *p3)
 		do {
 			uart_irq_rx_enable(cfg->uart);
 
-			LOG_DBG("Calling bt_recv(%p)", buf);
-			h4->recv(dev, buf);
+			if (h4->recv != NULL) {
+				LOG_DBG("Calling bt_recv(%p)", buf);
+				h4->recv(dev, buf);
+			}
 
 			/* Give other threads a chance to run if the ISR
 			 * is receiving data so fast that rx.fifo never

drivers/bluetooth/hci/hci_nxp_setup.c

@@ -194,6 +194,7 @@ struct nxp_ctlr_fw_upload_state {
 	bool is_error_case;
 	bool is_cmd7_req;
 	bool is_entry_point_req;
+	bool is_setup_done;
 
 	uint8_t last_5bytes_buffer[6];
 };
@@ -1171,11 +1172,15 @@ static int bt_nxp_ctlr_init(void)
 
 int bt_hci_transport_setup(const struct device *dev)
 {
+	int ret = 0;
 	if (dev != uart_dev) {
 		return -EINVAL;
 	}
 
-	return bt_nxp_ctlr_init();
+	if (!fw_upload.is_setup_done) {
+		ret = bt_nxp_ctlr_init();
+	}
+	return ret;
 }
 
 #define BT_HCI_VSC_BAUDRATE_UPDATE_LENGTH 4
@@ -1228,19 +1233,23 @@ int bt_h4_vnd_setup(const struct device *dev)
 		return 0;
 	}
 
-	err = bt_hci_baudrate_update(dev, operation_speed);
-	if (err) {
-		return err;
-	}
+	if (!fw_upload.is_setup_done) {
+		err = bt_hci_baudrate_update(dev, operation_speed);
+		if (err) {
+			return err;
+		}
 
-	/* BT waiting time after controller bandrate updated */
-	(void)k_msleep(CONFIG_BT_H4_NXP_CTLR_WAIT_TIME_AFTER_BAUDRATE_UPDATE);
+		/* BT waiting time after controller bandrate updated */
+		(void)k_msleep(CONFIG_BT_H4_NXP_CTLR_WAIT_TIME_AFTER_BAUDRATE_UPDATE);
+	}
 
 	err = fw_upload_uart_reconfig(operation_speed, flowcontrol_of_hci);
 	if (err) {
 		LOG_ERR("Fail to update uart bandrate");
 		return err;
 	}
 
+	fw_upload.is_setup_done = true;
+
 	return 0;
 }