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USB 3.0 Link Power Management (LPM) is designed to allow individual links in the bus to go into lower power states. There are two ways a link can enter a lower power state: 1. Device-initiated LPM. When a USB device decides it can go into a lower power link state, it sends a message to the parent hub, telling it to go into either U1 or U2. Device-initiated LPM is good for devices that send data to the host, like communications devices. 2. Hub-initiated LPM. After the link has been idle for a specific amount of time, the parent hub will request that the child go into a lower power state. The child can refuse that request. For example, a USB modem may want to refuse the LPM request if it is in the middle of receiving a text message. Hub-initiated LPM is good for devices where only the host initiates the data transfer, like USB printers or USB mass storage devices. Links will be automatically placed into higher power states by the USB hubs and roothubs whenever the host starts a USB transmission. Introduce a new usb_driver flag, disable_hub_initiated_lpm, that allows drivers to disable hub-initiated LPM. Signed-off-by: Sarah 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: Oliver Neukum <oliver@neukum.name> 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> Cc: linux-bluetooth@vger.kernel.org Cc: gigaset307x-common@lists.sourceforge.net Cc: netdev@vger.kernel.org Cc: linux-usb@vger.kernel.org Cc: linux-wireless@vger.kernel.org Cc: ath9k-devel@lists.ath9k.org Cc: libertas-dev@lists.infradead.org Cc: users@rt2x00.serialmonkey.com |
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