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Hi, I am working in power management. I have few questions about run time power management which was merged in linux 2.6.32 kernel onwards. Since the run time power management defines that when idle, suspend and resume will be scheduled, now the thing is from device driver perspective, it is bus driver that will suspend and resume its devices. but what from driver perspective driver needs to implement means as run time power management has also helper functions which will tell PM core that when to call various callbacks for suspend and resume for drivers (device, bus). But it might be case when the whole bus is not idle and still some drivers can be put into low power mode. Then does bus driver will be responsible for invoking the driver's suspend and resume (run time) or PM core will do that ? Use cases: ------------ 1) When the bus is idle 2) When the bus is not idle but still some peripherals can be put into low power mode...... Regards Raj |
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