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 | 5 +++++ > 1 file changed, 5 insertions(+) patch has been applied to bluetooth-next tree. Regards Marcel