linux-kernel - Re: [PATCH 3/5] irqchip: armada-370-xp: re-enable per-CPU interrupts at resume time

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Message-ID: <20151026092711.04193834@free-electrons.com>
Date:	Mon, 26 Oct 2015 09:27:11 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Marcin Wojtas <mw@...ihalf.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Tawfik Bayouk <tawfik@...vell.com>,
	linux-kernel@...r.kernel.org, Nadav Haklai <nadavh@...vell.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 3/5] irqchip: armada-370-xp: re-enable per-CPU
 interrupts at resume time

Dear Marcin Wojtas,

On Mon, 26 Oct 2015 08:06:18 +0100, Marcin Wojtas wrote:

> > Good :-) Hopefully the explanation in PATCH 5/5 is also clear enough.
> 
> The Ascii-art is beutiful, indeed:)

Glad to hear that my artistic skills are appreciated :)

> Yes, you are right - without any pm_ops the driver works well after
> suspend/resume in standby. However in the linux mem and standby is
> treated exactly the same as pm sleep, so the same routines are
> executed in both modes. Hence the s2ram support cannot spoil standby.

Absolutely. It would be nicer if we knew in the ->suspend() and
->resume() hooks if we're doing a standby suspend, or a mem suspend,
but IIRC, we don't have this information available.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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