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sxmo_suspend.sh: notes about wowlan and blocking suspend here

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Colin 2023-10-11 00:58:49 +00:00
parent 9a69d8bd0d
commit ff89819940
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hosts/modules/gui/sxmo/hooks/sxmo_suspend.sh
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@ -6,9 +6,30 @@
#
# this script is only called by sxmo_autosuspend, which is small, so if i wanted to
# be more proper i could instead re-implement autosuspend + integrations.
#
# N.B.: if any wake locks are acquired between invocation of this script and the
# rtcwake call below, suspend will fail -- even if those locks are released during
# the same period.
#
# this is because the caller of this script writes /sys/power/wakeup_count, and the
# kernel checks consistency with that during the actual suspend request.
# see: <https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-power>
#
# for this reason, keep this script as short as possible.
#
# common sources of wakelocks (which one may wish to reduce) include:
# - `sxmo_led.sh blink` (every 2s, by default)
suspend_time=300
# TODO: don't do this wowlan stuff every single time.
# - it's costly (can take like 1sec)
# - it seems to actually block suspension quite often
# - possibly rtl8723cs takes time to apply wowlan changes during which suspension is impossible
# alternative is to introduce some layer of cache:
# - do so in a way such that WiFi connection state changes invalidate the cache
# - because wowlan enable w/o connection may well behave differently than w/ connection
# - calculating IP addr from link, and then caching on the args we call our helper with may well suffice
doas rtl8723cs-wowlan enable-clean
# wake on ssh
doas rtl8723cs-wowlan tcp --dest-port 22