From: Tim Jiang tjiang@codeaurora.org
[ 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 --- drivers/bluetooth/btusb.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 27ff7a6e2fc9..6d643651d69f 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -3263,6 +3263,11 @@ 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);