• 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>
    e1f12eb6
Name
Last commit
Last update
..
act2000 Loading commit data...
capi Loading commit data...
divert Loading commit data...
gigaset Loading commit data...
hardware Loading commit data...
hisax Loading commit data...
hysdn Loading commit data...
i4l Loading commit data...
icn Loading commit data...
isdnloop Loading commit data...
mISDN Loading commit data...
pcbit Loading commit data...
sc Loading commit data...
Kconfig Loading commit data...
Makefile Loading commit data...