linux-kernel - Re: [PATCH 0/7] soc: brcmstb: add system suspend support for STB SoCs

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Message-ID: <CADtm3G7GQNuaZDoNe84YAh7pRV9s_2VhUuW8YpaCoNuozoyVZA@mail.gmail.com>
Date:	Thu, 18 Jun 2015 20:20:52 -0700
From:	Gregory Fong <gregory.0xf0@...il.com>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH 0/7] soc: brcmstb: add system suspend support for STB SoCs

On Thu, Jun 18, 2015 at 5:11 PM, Brian Norris
<computersforpeace@...il.com> wrote:
> Hi,
>
> This patch set introduces system suspend/resume support for Broadcom STB SoCs.
> There are two suspend modes (S2 and S3) as well as a related low-power shutdown
> mode (S5).
>
> Along with the core PM support, include a driver for the wakeup-timer, which
> allows for simple testing of suspend/resume wakeup cycles.
>
> Brian
>
> Brian Norris (7):
>   Documentation: dt: brcmstb: add system PM bindings
>   Documentation: dt: brcmstb: add waketimer documentation
>   soc: add stubs for brcmstb SoC's
>   soc: brcmstb: add PM suspend/resume support (S2/S3/S5)
>   soc: brcmstb: add wake-timer driver
>   ARM: brcmstb: mask GIC IRQs on suspend
>   ARM: dts: brcmstb: add BCM7445 system PM DT nodes
>

I tested this series two ways: with the device tree built into the
bootloader (BOLT) on BCM7445 and by using
arch/arm/boot/dts/bcm7445-bcm97445svmb.dtb

With the device tree from BOLT, everything works fine.  Tested the
waketimer for S2, S3, and S5.

With the device tree in arch/arm/boot/dts/bcm7445-bcm97445svmb.dts, S2
works, but S3 and S5 do not.  It comes back up but doesn't reach the
prompt:

[    6.050808] PM: suspend of devices complete after 1.425 msecs
[    6.051760] PM: late suspend of devices complete after 0.947 msecs
[    6.052535] PM: noirq suspend of devices complete after 0.770 msecs
[    6.052537] Disabling non-boot CPUs ...
[    6.053005] CPU1: shutdown
[    6.065914] CPU2: shutdown
[    6.080756] CPU3: shutdown
[    6.095214] Enabling non-boot CPUs ...
[    6.111496] CPU1 is up
[    6.126934] CPU2 is up
[    6.142511] CPU3 is up
[    6.145308] PM: noirq resume of devices complete after 2.772 msecs
[    6.148022] PM: early resume of devices complete after 2.626 msecs
[    6.151017] PM: resume of devices complete after 2.976 msecs
[    6.212771] Restarting tasks ... done.
[[[ output stops here ]]]

I suspect there might be an issue somewhere in
[PATCH 7/7] ARM: dts: brcmstb: add BCM7445 system PM DT nodes.
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