• Sarah Sharp's avatar
    USB: Disable hub-initiated LPM for comms devices. · e1f12eb6
    Sarah Sharp authored
    Hub-initiated LPM is not good for USB communications devices.  Comms
    devices should be able to tell when their link can go into a lower power
    state, because they know when an incoming transmission is finished.
    Ideally, these devices would slam their links into a lower power state,
    using the device-initiated LPM, after finishing the last packet of their
    data transfer.
    If we enable the idle timeouts for the parent hubs to enable
    hub-initiated LPM, we will get a lot of useless LPM packets on the bus
    as the devices reject LPM transitions when they're in the middle of
    receiving data.  Worse, some devices might blindly accept the
    hub-initiated LPM and power down their radios while they're in the
    middle of receiving a transmission.
    The Intel Windows folks are disabling hub-initiated LPM for all USB
    communications devices under a xHCI USB 3.0 host.  In order to keep
    the Linux behavior as close as possible to Windows, we need to do the
    same in Linux.
    Set the disable_hub_initiated_lpm flag for for all USB communications
    drivers.  I know there aren't currently any USB 3.0 devices that
    implement these class specifications, but we should be ready if they do.
    Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
    Cc: Marcel Holtmann <marcel@holtmann.org>
    Cc: Gustavo Padovan <gustavo@padovan.org>
    Cc: Johan Hedberg <johan.hedberg@gmail.com>
    Cc: Hansjoerg Lipp <hjlipp@web.de>
    Cc: Tilman Schmidt <tilman@imap.cc>
    Cc: Karsten Keil <isdn@linux-pingi.de>
    Cc: Peter Korsgaard <jacmet@sunsite.dk>
    Cc: Jan Dumon <j.dumon@option.com>
    Cc: Petko Manolov <petkan@users.sourceforge.net>
    Cc: Steve Glendinning <steve.glendinning@smsc.com>
    Cc: "John W. Linville" <linville@tuxdriver.com>
    Cc: Kalle Valo <kvalo@qca.qualcomm.com>
    Cc: "Luis R. Rodriguez" <mcgrof@qca.qualcomm.com>
    Cc: Jouni Malinen <jouni@qca.qualcomm.com>
    Cc: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
    Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com>
    Cc: Christian Lamparter <chunkeey@googlemail.com>
    Cc: Brett Rudley <brudley@broadcom.com>
    Cc: Roland Vossen <rvossen@broadcom.com>
    Cc: Arend van Spriel <arend@broadcom.com>
    Cc: "Franky (Zhenhui) Lin" <frankyl@broadcom.com>
    Cc: Kan Yan <kanyan@broadcom.com>
    Cc: Dan Williams <dcbw@redhat.com>
    Cc: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
    Cc: Ivo van Doorn <IvDoorn@gmail.com>
    Cc: Gertjan van Wingerde <gwingerde@gmail.com>
    Cc: Helmut Schaa <helmut.schaa@googlemail.com>
    Cc: Herton Ronaldo Krzesinski <herton@canonical.com>
    Cc: Hin-Tak Leung <htl10@users.sourceforge.net>
    Cc: Larry Finger <Larry.Finger@lwfinger.net>
    Cc: Chaoming Li <chaoming_li@realsil.com.cn>
    Cc: Daniel Drake <dsd@gentoo.org>
    Cc: Ulrich Kunitz <kune@deine-taler.de>
    Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
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