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

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Date:	Tue, 19 May 2015 08:09:27 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Felipe Balbi <balbi@...com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	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

* Rafael J. Wysocki <rjw@...ysocki.net> [150519 07:02]:
> On Tuesday, May 19, 2015 04:04:43 PM Rafael J. Wysocki wrote:
> > On Monday, May 18, 2015 04:44:01 PM Tony Lindgren wrote:
> > > 
> > > For most drivers, we should be able to drop the following
> > > boilerplate code from runtime_suspend and runtime_resume
> > > functions:
> > > 
> > > 	...
> > > 	device_init_wakeup(dev, true);
> > > 	...
> > > 	if (device_may_wakeup(dev)
> > > 		enable_irq_wake(irq);
> > > 	...
> > > 	if (device_may_wakeup(dev)
> > > 		enable_irq_wake(irq);
> > 
> > Closing parens are missin in the above two if () statements.
> > 
> > Also, should the second one be disable_irq_wake(irq)?

Thanks yeah it should disable_irq_wake :) Will fix.

> > > 	...
> > > 	device_init_wakeup(dev, false);
> > > 	...
> > > 
> > > We can replace it with just the following init and exit
> > > time code:
> > > 
> > > 	...
> > > 	device_init_wakeup(dev, true);
> > > 	dev_pm_set_wake_irq(dev, irq);
> > > 	...
> > > 	dev_pm_clear_wake_irq(dev);
> > > 	device_init_wakeup(dev, false);
> > > 	...
> > > 
> > > And for hardware with dedicated wake-up interrupts:
> > > 
> > > 	...
> > > 	device_init_wakeup(dev, true);
> > > 	dev_pm_set_dedicated_wake_irq(dev, irq);
> > > 	...
> > > 	dev_pm_clear_wake_irq(dev);
> > > 	device_init_wakeup(dev, false);
> > > 	...
> > > 
> > > For now, let's only enable it for select PM_WAKEIRQ.
> > 
> > Why?  What would be wrong with doing that unconditionally?

No reason to make it conditional any longer. it's there from
the earlier version that only handled the dedicated wake IRQS.
 
> I mean, what about making it depend on CONFIG_PM directly?

OK let's do that.

Regards,

Tony
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