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 64b0e68c68ebf81b8c53736412f44d3f7edcb5b0..a97e5c476adf1085c541bca527bcc51d0d75be36 100644 (file)
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -4136,6 +4136,11 @@ 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);