linux-kernel - Re: [linux-sunxi] Re: [PATCH] input: sun4i-lradc-keys: Add wakup support

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Date:   Tue, 29 Oct 2019 02:45:59 +0100
From:   Ondřej Jirman <megous@...ous.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-sunxi@...glegroups.com, Hans de Goede <hdegoede@...hat.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        "open list:SUN4I LOW RES ADC ATTACHED TABLET KEYS DRIVER" 
        <linux-input@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-sunxi] Re: [PATCH] input: sun4i-lradc-keys: Add wakup
 support

On Mon, Oct 28, 2019 at 05:12:50PM -0700, Dmitry Torokhov wrote:
> On Tue, Oct 29, 2019 at 12:56:26AM +0100, Ondřej Jirman wrote:
> > On Mon, Oct 28, 2019 at 04:38:28PM -0700, Dmitry Torokhov wrote:
> > > > +
> > > > +	error = dev_pm_set_wake_irq(dev, irq);
> > > > +	if (error) {
> > > > +		dev_err(dev, "Could not set wake IRQ\n");
> > > > +		return error;
> > > > +	}
> > > > +
> > > 
> > > I wonder if we could teach platform driver core to handle this for us.
> > 
> > Not sure, some drivers do enable/disable wake_irq by hand in suspend/resume
> > callbacks, so it would probably need to be opt-in somehow. I guess calling the
> > function like this is one way to make it opt-in.
> > 
> > The other way may be by passing a flag somewhere, like to
> > request_threaded_irq. Did you have something more concrete in mind?
> 
> I think it is perfectly fine to continue using enable_irq_wake and
> disable_irq_wake from the driver while marking irq as being wake irq
> form the core.

I see, it looks like irq_set_irq_wake will track the calls via wake_depth

https://elixir.bootlin.com/linux/latest/source/kernel/irq/manage.c#L714

But all irqs are not necessarily wake irqs, no? So it still may need to be
opt-in somehow.

Anyway, I'm no PM expert. I started looking at PM code about two weeks ago, and
I really don't feel like I can contribute much to these kinds of decisions with
my current level of understanding, right now.

regards,
	o.

> Thanks.
> 
> -- 
> Dmitry
> 
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