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 1b0adf5c2376017b20417167c83ff571a3af1dfd..7188f0fb2e050bf69daf66b752ad458f25a9ac91 100644 (file)
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2595,6 +2595,11 @@ 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);