Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [linux-pm] [patch update 2 fix] PM: Introduce core framework for run-time PM of I/O devices | Date | Mon, 22 Jun 2009 17:33:42 +0200 |
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On Monday 22 June 2009, Arjan van de Ven wrote: > On Mon, 22 Jun 2009 15:20:43 +0900 > Magnus Damm <magnus.damm@gmail.com> wrote: > > > On Sat, Jun 20, 2009 at 11:30 PM, Alan > > Stern<stern@rowland.harvard.edu> wrote: > > > Some more thoughts... > > > > > > Magnus, you might have some insights here. It occurred to me that > > > some devices can switch power levels very quickly, and the drivers > > > might therefore want the runtime suspend and resume methods to be > > > called as soon as possible, even in interrupt context. > > > > I'd like to call pm_request_suspend() from interrupt context. I don't > > there are some really strong reasons to at least be able to call the > resume function from an interrupt handler.... shared interrupts are one > of them.
Yes. But that requires your hardware to be able to wake up fast enough, so I think we can introduce pm_runtime_resume_atomic() and pm_runtime_suspend_atomic() to be used with the devices that can do that, as proposed by Alan.
Surely not all devices can do it, though.
Best, Rafael
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