Query: When will drv->poweroff() called
From: Viresh Kumar
Date: Mon Feb 06 2012 - 00:55:32 EST
Sorry for asking this silly question, but i couldn't locate much
help for it in documentation, so asking it.
We were testing hibernation for SPEAr13xx SoC family, based on
ARM Cortex a9.
I observed that poweroff() callback of individual drivers are not
getting called at all, while we test hibernate.
I tried to go through the code to see what happened. It looked like
there should be call to hibernation_set_ops() for platforms that are
willing to get a call to poweroff() for their drivers. Otherwise
shutdown of the busses gets called, which is a completely different path.
There are many drivers today, that are registering poweroff() from dev_pm_ops
but are not doing bus specific shutdown stuff.
Even i tried to look for hibernation_set_ops() in kernel, and only acpi
code is calling it. I didn't understood how other ARM Sub-Arch's are handling
Thanks in advance :)
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