[PATCH 2/3] Bluetooth: hci_mrvl: Wait for final ack before switching baudrate

[Sascha Hauer]

For the Marvell HCI UART we have to upload two firmware files. The first
one is only for switching the baudrate of the device to a higher
baudrate. After the baudrate switching firmware has been uploaded the
device waits for a final ack (0x5a) before actually switching the
baudrate. To send this final ack with the old baudrate give the hci
ldisc workqueue a chance to run before switching the baudrate. Without
this the final ack will never be received by the device and firmware
upload fails.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
 drivers/bluetooth/hci_mrvl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bluetooth/hci_mrvl.c b/drivers/bluetooth/hci_mrvl.c
index 50212ac629e3..a0a74362455e 100644
--- a/drivers/bluetooth/hci_mrvl.c
+++ b/drivers/bluetooth/hci_mrvl.c
@@ -339,6 +339,9 @@ static int mrvl_setup(struct hci_uart *hu)
 		return -EINVAL;
 	}
 
+	/* Let the final ack go out before switching the baudrate */
+	hci_uart_wait_until_sent(hu);
+
 	hci_uart_set_baudrate(hu, 3000000);
 	hci_uart_set_flow_control(hu, false);
 
-- 
2.20.1