On 20 October 2015 at 18:04, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 20 Oct 2015, Mark Brown wrote: > >> On Tue, Oct 20, 2015 at 10:40:03AM -0400, Alan Stern wrote: >> >> > Furthermore, that applies only to devices that use synchronous suspend. >> > Async suspend is becoming common, and there the only restrictions are >> > parent-child relations plus whatever explicit requirements that drivers >> > impose by calling device_pm_wait_for_dev(). >> >> Hrm, this is the first I'd noticed that feature though I see the initial >> commit dates from January. > > Async suspend and device_pm_wait_for_dev() were added in January 2010, > not 2015! > >> It looks like most of the users are PCs at >> the minute but we should be using it more widely for embedded things, >> there's definitely some cases I'm aware of where it will allow us to >> remove some open coding. >> >> It does seem like we want to be feeding dependency information we >> discover for probing way into the suspend dependencies... > > Rafael has been thinking about a way to do this systematically. > Nothing concrete has emerged yet. This iteration of the series would make this quite easy, as dependencies are calculated before probes are attempted: https://lkml.org/lkml/2015/6/17/311 Regards, Tomeu > Alan Stern > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
