Date: Thu, 14 May 2015 11:51:10 -0400 (EDT)
From: Alan Stern <stern@rowland.harvard.edu>
To: Felipe Balbi <balbi@ti.com>
cc: Tony Lindgren <tony@atomide.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Andreas Fenkart <afenkart@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Huiquan Zhong <huiquan.zhong@intel.com>,
        Kevin Hilman <khilman@kernel.org>, NeilBrown <neilb@suse.de>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Nishanth Menon <nm@ti.com>, Peter Hurley <peter@hurleysoftware.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>, <linux-pm@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <linux-serial@vger.kernel.org>,
        <linux-omap@vger.kernel.org>
Subject: Re: [PATCH 2/5] PM / Wakeirq: Add automated device wake IRQ handling
In-Reply-To: <20150514020634.GB20006@saruman.tx.rr.com>
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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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