Messages in this thread | | | Date | Tue, 7 Feb 2012 09:49:52 +0530 | From | Viresh Kumar <> | Subject | Re: Query: When will drv->poweroff() called |
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Thanks Rafael.
On 2/6/2012 5:37 PM, Rafael J. Wysocki wrote: > On Monday, February 06, 2012, Viresh Kumar wrote: >> > >> > Hi Guys, >> > >> > 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. > They should be called in the last phase of hibernation, after the image > has been created and the system is going for "power off" (hance the > callback name). > >> > 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. > That's correct. The ->poweroff() callbacks are only executed if > hibernation_mode is equal to HIBERNATION_PLATFORM, which is not the > default. > >> > 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. > That's correct too. > >> > I didn't understood how other ARM Sub-Arch's are handling this. > Well, they are supposed to call hibernation_set_ops() and set the operations > appropriately. Those operations may be empty routines if they don't need > to do anything, but they have to be defined.
Hi Amit,
Can you give some input on why none of the ARM platforms are calling this routine currently.
-- viresh
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