linux-kernel - Re: [PATCH 0/5] Add standby support for the recent mvebu SoCs

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Message-ID: <CAPv3WKeXGcuFFJpaW9+xtN6C_FYfwj5EsJVAKMzLN7A5ZxS_cw@mail.gmail.com>
Date:	Wed, 1 Apr 2015 11:39:19 +0200
From:	Marcin Wojtas <mw@...ihalf.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/5] Add standby support for the recent mvebu SoCs

Thanks, it heleped.

Best regards,
Marcin

2015-04-01 11:21 GMT+02:00 Gregory CLEMENT <gregory.clement@...e-electrons.com>:
> Hi Marcin,
>
> On 01/04/2015 11:02, Marcin Wojtas wrote:
>> Hi Gregory,
>>
>> When I run standby on A385 I get following error:
>> root@...alhost:~# echo standby > /sys/power/state
>> [  122.889266] PM: System core suspend callback
>> mvebu_mbus_suspend+0x0/0xf4 failed.
>>
>> Did you see this issue in your setup?
>
> Yes the mbus driver for the Armada 38x must be updated. As Thomas
> worked on it I didn't put it in the series.
>
> I have just create the patch needed you can try it, and I will
> add it in the next version of the series.
>
> Thanks,
>
> Gregory
>
>
>>
>> Best regards,
>> Marcin
>>
>> 2015-03-30 16:04 GMT+02:00 Gregory CLEMENT <gregory.clement@...e-electrons.com>:
>>> Hi,
>>>
>>> Until now only one Armada XP based board supported suspend to
>>> ram. This suspend to ram mode was unusual because it involved shutting
>>> down the SoC and relied on a PIC to wake up the system.
>>>
>>> However, most of the recent mvebu SoCs can support the standby
>>> mode. Unlike for the suspend to ram, nothing special have to be done
>>> for these SoCs. In this mode the SoCs go in idle mode (but they remain
>>> powered up) and the devices enter in suspend mode. The support itself
>>> was added in the patch 2.
>>>
>>> In order to wake-up the interrupt controller driver have been
>>> updated. As in standby mode the interrupt controller is not shutdown,
>>> any interrupt can be a wake-up source. So the MPIC (patch 4) and the
>>> GIC (patch 3) now used the flags IRQCHIP_SKIP_SET_WAKE and
>>> IRQCHIP_MASK_ON_SUSPEND.
>>>
>>> A wake up source is supposed to work in suspend _and_ in standby mode
>>> but for the mvebu SoCs, no interrupt can wake up the system. The last
>>> patch warns the user about it.
>>>
>>> The first patch is a clean-up found while working on this series
>>>
>>> All the patch are independents either for building or for running.
>>>
>>> Thanks,
>>>
>>> Gregory
>>>
>>>
>>> Gregory CLEMENT (5):
>>>   ARM: mvebu: Use __init for the PM initialization functions
>>>   ARM: mvebu: Add standby support
>>>   ARM: mvebu: Allow using the GIC for wakeup in standby mode
>>>   irqchip: armada-370-xp: Allow using wakeup source
>>>   ARM: mvebu: Warn about the wake-ups sources not taken into account in
>>>     suspend
>>>
>>>  arch/arm/mach-mvebu/board-v7.c      |  7 +++++
>>>  arch/arm/mach-mvebu/common.h        |  5 ++--
>>>  arch/arm/mach-mvebu/pm-board.c      | 15 ++++++----
>>>  arch/arm/mach-mvebu/pm.c            | 57 ++++++++++++++++++++++++++++++++-----
>>>  drivers/irqchip/irq-armada-370-xp.c |  1 +
>>>  5 files changed, 70 insertions(+), 15 deletions(-)
>>>
>>> --
>>> 2.1.0
>>>
>>>
>>> _______________________________________________
>>> linux-arm-kernel mailing list
>>> linux-arm-kernel@...ts.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
>
> --
> Gregory Clement, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com
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