• Kalle Valo's avatar
    mac80211: implement dynamic power save · 520eb820
    Kalle Valo authored
    This patch implements dynamic power save for mac80211. Basically it
    means enabling power save mode after an idle period. Implementing it
    dynamically gives a good compromise of low power consumption and low
    latency. Some hardware have support for this in firmware, but some
    require the host to do it.
    The dynamic power save is implemented by adding an timeout to
    ieee80211_subif_start_xmit(). The timeout can be enabled from userspace
    with Wireless Extensions. For example, the command below enables the
    dynamic power save and sets the time timeout to 500 ms:
    iwconfig wlan0 power timeout 500m
    Power save now only works with devices which handle power save in firmware.
    It's also disabled by default and the heuristics when and how to enable is
    considered as a policy decision and will be left for the userspace to handle.
    In case the firmware has support for this, drivers can disable this feature
    Big thanks to Johannes Berg for the help with the design and code.
    Signed-off-by: default avatarKalle Valo <kalle.valo@nokia.com>
    Acked-by: default avatarJohannes Berg <johannes@sipsolutions.net>
    Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>