于 2012/9/22 20:08, Rafael J. Wysocki 写道:
So, my current idea is why don't we handle that through PM QoS? I mean we have
a means to specify per-device PM QoS wakeup latency constraits and expose it to
user space on a per-device basis. I suppose we can we can handle the
"don't remove power from this device" requirement in a similar way, i.e. add
something like per-device PM QoS flags specifying binary requirements regarding the
low-power states the device can be put into by ACPI or another platform-dependent
mechanism, like "the state to go into cannot be zero power", "remote wakeup is
required" etc.
So according your suggestion, we should add a new pm Qos which may name "remote
wakeup
is required" or "power off is allowed"(this may be better since there are other
reasons
for not enable to power off device except for remote wakeup enable). When we try
to power
off devices, we should take it into account, right?
Best regards
Tianyu Lan
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