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.ha...@pengutronix.de>
---
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
