• Marcel Holtmann's avatar
    Bluetooth: Send HCI Reset command by default on device initialization · 7a9d4020
    Marcel Holtmann authored
    The Bluetooth subsystem was not using the HCI Reset command when doing
    device initialization. The Bluetooth 1.0b specification was ambiguous
    on how the device firmware was suppose to handle it. Almost every device
    was triggering a transport reset at the same time. In case of USB this
    ended up in disconnects from the bus.
    
    All modern Bluetooth dongles handle this perfectly fine and a lot of
    them actually require that HCI Reset is sent. If not then they are
    either stuck in their HID Proxy mode or their internal structures for
    inquiry and paging are not correctly setup.
    
    To handle old and new devices smoothly the Bluetooth subsystem contains
    a quirk to force the HCI Reset on initialization. However maintaining
    such a quirk becomes more and more complicated. This patch turns the
    logic around and lets the old devices disable the HCI Reset command.
    
    The only device where the HCI_QUIRK_NO_RESET is still needed are the
    original Digianswer devices and dongles with an early CSR firmware.
    
    CSR reported that they fixed this for version 12 firmware. The last
    official release of version 11 firmware is build ID 115. The first
    version 12 candidate was build ID 117.
    Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
    7a9d4020
hci.h 22.7 KB