Bluetooth: btusb: fix bt fiwmare downloading failure issue for qca btsoc.

BugLink: https://bugs.launchpad.net/bugs/1938713
[ Upstream commit 4f00bfb372674d586c4a261bfc595cbce101fbb6 ]

This is btsoc timing issue, after host start to downloading bt firmware,
ep2 need time to switch from function acl to function dfu, so host add
20ms delay as workaround.

Signed-off-by: Tim Jiang <tjiang@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index a556609302a00c460baf7e54db89595c4d3f4874..526ce2ecd3dbbb4dd5c592c9560331d509ec3eb4 100644 (file)
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3293,6 +3293,11 @@ static int btusb_setup_qca_download_fw(struct hci_dev *hdev,
        sent += size;
        count -= size;
 
+       /* ep2 need time to switch from function acl to function dfu,
+        * so we add 20ms delay here.
+        */
+       msleep(20);
+
        while (count) {
                size = min_t(size_t, count, QCA_DFU_PACKET_LEN);