[Sorry for mailing again, earlier mail bounced on linux-pm list, as i wasn't subscribed to it] Hi Amit, Can you please clear my doubt regarding calling of hibernation_set_ops() for ARM SoC's? -- viresh On Mon, Feb 6, 2012 at 8:19 PM, Viresh Kumar <viresh.kumar@xxxxxx> wrote: > 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. _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/linux-pm
