Hi Zijun,
> 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@xxxxxxxxxxxxxx>
> ---
> drivers/bluetooth/btusb.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 5245714..b0743db 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -4064,6 +4064,7 @@ static int btusb_setup_qca_download_fw(struct hci_dev *hdev,
>
> sent += size;
> count -= size;
you need a comment here explain why this is needed.
> + msleep(20);
>
> while (count) {
> size = min_t(size_t, count, QCA_DFU_PACKET_LEN);
Regards
Marcel
