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    SubjectRe: [patch update] Re: [linux-pm] Run-time PM idea (was: Re: [RFC][PATCH 0/2] PM: Rearrange core suspend code)
    Date
    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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