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

[ 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>

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 4e3b24a0511ffc73bbfc2797ca4f1799ebf69b0b..30c09b9ddbf0dd1e96f6d077b6ad5b716b6b17b3 100644 (file)
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2508,6 +2508,11 @@ 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);