From 771fb4aaaec12d948c35fde6c4f15fb6914d2d3a Mon Sep 17 00:00:00 2001 From: Tim Jiang Date: Fri, 23 Jul 2021 10:30:43 +0800 Subject: [PATCH] Bluetooth: btusb: fix bt fiwmare downloading failure issue for qca btsoc. stable inclusion from linux-4.19.198 commit 012a3944008fc774b1eae42be7e8dfc4ee2ab521 -------------------------------- [ 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 Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin Signed-off-by: Yang Yingliang --- drivers/bluetooth/btusb.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 1b0adf5c2376..7188f0fb2e05 100644 --- 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); -- GitLab