linux-kernel - Re: [PATCH v2 1/2] pinctrl: rockchip: Handle wakeup pins

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Date:	Fri, 28 Nov 2014 09:05:52 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Heiko Stuebner <heiko@...ech.de>,
	Sonny Rao <sonnyrao@...omium.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Chris Zhong <zyw@...k-chips.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] pinctrl: rockchip: Handle wakeup pins

On Wed, Nov 19, 2014 at 11:51 PM, Doug Anderson <dianders@...omium.org> wrote:

> The rockchip pinctrl driver was using irq_gc_set_wake() as its
> implementation of irq_set_wake() but was totally ignoring everything
> that irq_gc_set_wake() did (which is to upkeep gc->wake_active).
>
> Let's fix that by setting gc->wake_active as GPIO_INTEN at suspend
> time and restoring GPIO_INTEN at resume time.
>
> NOTE a few quirks when thinking about this patch:
> - Rockchip pinctrl hardware supports both "disable/enable" and
>   "mask/unmask".  Right now we only use "disable/enable" and present
>   those to Linux as "mask/unmask".  This should be OK because
>   enable/disable is optional and Linux will implement it in terms of
>   mask/unmask.  At the moment we always tell hardware all interrupts
>   are unmasked (the boot default).
> - At suspend time Linux tries to call "disable" on all interrupts and
>   also enables wakeup on all wakeup interrupts.  One would think that
>   since "disable" is implemented as "mask" when "disable" isn't
>   provided and that since we were ignoring gc->wake_active that
>   nothing would have woken us up.  That's not the case since Linux
>   "optimizes" things and just leaves interrutps unmasked, assuming it
>   could mask them later when they go off.  That meant that at suspend
>   time all interrupts were actually being left enabled.
>
> With this patch random non-wakeup interrupts no longer wake the system
> up.  Wakeup interrupts still wake the system up.
>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Reviewed-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Reviewed-by: Heiko Stuebner <heiko@...ech.de>
> ---
> Changes in v2: None

Patch applied.

Yours,
Linus Walleij
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