Am Donnerstag, 11. Juni 2009 07:18:46 schrieb Magnus Damm:
> 3) When all devices in the power domain are suspended the bus code can
> turn off the power. The reason why I'd like to only autosuspend when
So you are saying that you have power dependencies independent
of the device tree?
> all devices are idle is simply that we don't get any power savings
> from the per device autosuspend() callbacks, only from turning off
> power to the entire per-domain. So bindly autosuspending and
> autoresuming devices is just pure overhead unless we know we can do it
> for all devices in the domain.
Why can't you do this within the framework? You simply suspend when
all a domain's devices have been autosuspended.
I suppose we could have a helper.
int pm_autosuspend_in_domain(struct device *dev)
{
int err;
mutex_lock(dev->power_domain);
if (! --dev->power_domain.active_devices)
err = dev->power_domain->power_down(dev->power_domain);
else
err = 0;
mutex_unlock(dev->power_domain);
return err;
}
Regards
Oliver
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