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Date: Thu, 21 Jun 2012 10:27:46 -0400 (EDT) From: Alan Stern <stern@...land.harvard.edu> To: chao xie <xiechao.linux@...il.com> cc: linux-pm@...r.kernel.org, <linux-kernel@...r.kernel.org>, <rjw@...k.pl>, <pavel@....cz>, <linux-arm-kernel@...ts.infradead.org> Subject: Re: pm runtime and system suspend resume On Thu, 21 Jun 2012, chao xie wrote: > I check the code, __device_suspend will invoke dev->pm_domain->ops > first if dev->pm_domain is not NULL. > Taking "suspend" as esample, i can do the following things in the > dev->pm_domain->ops->suspend > 1. invoke dev->driver->pm->suspend for suspending the device > 2. do what we do in dev->pm_domain->ops->runtime_suspend for > suspending the surrounded logic, for example, shutdown the phy or > clocks. > So is above implementation fine? Yes, that sounds like it will work. Watch out for the case where your device is already runtime-suspended when a system suspend occurs. Have you read section 6 in Documentation/power/runtime_pm.txt? It is related to your question. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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