linux-kernel - Re: [PATCH 2/5] PM / Wakeirq: Add automated device wake IRQ handling

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Date:	Thu, 14 May 2015 11:51:10 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Felipe Balbi <balbi@...com>
cc:	Tony Lindgren <tony@...mide.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Andreas Fenkart <afenkart@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Huiquan Zhong <huiquan.zhong@...el.com>,
	Kevin Hilman <khilman@...nel.org>, NeilBrown <neilb@...e.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Nishanth Menon <nm@...com>,
	Peter Hurley <peter@...leysoftware.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 2/5] PM / Wakeirq: Add automated device wake IRQ handling

On Wed, 13 May 2015, Felipe Balbi wrote:

> This brings up a question, actually. What to do with devices which were
> already runtime suspended when user initiated suspend-to-ram ? Do we
> leave wakeups enabled, or do we revisit device_may_wakeup() and
> conditionally runtime_resume the device, disable wakeup, and let its
> ->suspend() callback be called ?

In theory, the subsystem/device drivers already have code do this.  
They're supposed to, anyway.  The USB host stack does it in
drivers/usb/core/driver.c:choose_wakeup().

Alan Stern

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