linux-kernel - Re: [PATCH v2 1/4] pinctrl: rockchip: Set wake

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Message-ID: <3672443.givx50pOhv@diego>
Date:	Fri, 24 Oct 2014 01:55:17 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Chris Zhong <zyw@...k-chips.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	linux-rockchip@...ts.infradead.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] pinctrl: rockchip: Set wake_enabled

Am Donnerstag, 23. Oktober 2014, 09:55:27 schrieb Doug Anderson:
> Heiko,
> 
> On Thu, Oct 23, 2014 at 9:43 AM, Heiko Stübner <heiko@...ech.de> wrote:
> > Am Dienstag, 21. Oktober 2014, 10:47:32 schrieb Doug Anderson:
> >> The rockchip pinctrl driver uses irq_gc_set_wake() but doesn't setup
> >> the .wake_enabled member.  That means that we can never actually use a
> >> pin for wakeup.  When "irq_set_irq_wake()" tries to call through it
> >> will always get a failure from set_irq_wake_real() and will then set
> >> wake_depth to 0.  Assuming you can resume you'll later get an error
> >> message about "Unbalanced IRQ x wake disable".
> > 
> > The change itself looks reasonable. But now being able to read the docs
> > for
> > it, it doesn't look like all gpios are able to wake the system.
> > 
> > On the rk3288 it seems to be only the pins from gpio0 that can do this
> > (similar for different banks on the other Rockchip SoCs) - see
> > PMU_WAKEUP_CFG0 and PMU_WAKEUP_CFG1[1].
> > 
> > So I guess we'll need something more eloquent to handle this.
> 
> I think long term we're going to need something more elegant, yes.
> ...but it turns out that as long as you're not in the low, low power
> state that all pins can wake up the system.
> 
> Check out "Table 4-5 Power Domain Status Summary in all Work Mode".
> In Mode 3 (called "sleep") all GPIOs can wake the system up.  This is
> the mode that Chris's current suspend/resume patch uses (actually, it
> doesn't quite get all the way to that mode yet, but that's the
> target).  It would be ideal if we could get to Mode 4 (called
> "poweroff"), but when I talked to Rockchip they were a little hesitant
> about promising that it would work.

You're right ... didn't read far enough it seems, so this patch also

Reviewed-by: Heiko Stuebner <heiko@...ech.de>



> NOTE: One unresolved thing with the current series (this series +
> Chris's) is that pretty much any interrupt can wake up the system.
> Even typing on the UART seems to do it.  Somehow we're not masking
> interrupts in a way that prevents this, but I haven't tracked it down
> yet.  I don't think it's related to this patch.

I guess the interrupts that aren't wakeup sources should then get masked when 
going to sleep?




Heiko
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