linux-kernel - Re: [PATCH v3 0/5] Firmware-assisted suspend/resume of Exynos SoCs

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Date:	Wed, 24 Sep 2014 10:23:23 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	Kukjin Kim <kgene.kim@...sung.com>, Kukjin Kim <kgene@...nel.org>
Cc:	'Tomasz Figa' <tomasz.figa@...il.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	'Russell King - ARM Linux' <linux@....linux.org.uk>,
	'Arnd Bergmann' <arnd@...db.de>, swarren@...dia.com,
	acourbot@...dia.com, 'Olof Johansson' <olof@...om.net>,
	drake@...lessm.com, tomeu@...euvizoso.net
Subject: Re: [PATCH v3 0/5] Firmware-assisted suspend/resume of Exynos SoCs

Hi Kukjin,

On 2014-09-24 09:53, Kukjin Kim wrote:
>
> On 09/15/14 09:21, Kukjin Kim wrote:
>>
>>> On 26.08.2014 16:10, Tomasz Figa wrote:
>>>> On Exynos-based boards running secure firmware the sequence of low 
>>>> level
>>>> operations to enter and leave system-wide sleep mode is different than
>>>> on those without the firmware. Namely:
>>>>   - CP15 power control and diagnostic registers cannot be written 
>>>> directly,
>>>>   - the way of setting boot address and boot flag is different,
>>>>   - different resume handler needs to be used,
>>>>   - dedicated SMC call needs to be performed instead of letting the 
>>>> CPU enter
>>>>     WFI.
>>>>
>>>> This series introduces .suspend() and .resume() firmware operations to
>>>> perform low level firmware-specific suspend and resume and then 
>>>> leverages
>>>> them to provide suspend-resume path meeting the above requirements. 
>>>> Three
>>>> additional patches extend device tree sources of Trats2 board with 
>>>> necessary
>>>> setup to enable suspend/resume support.
>>>>
>>>> This series has been tested on Exynos4412-based Trats2 board, 
>>>> without any
>>>> additional patches. Unfortunately v3.17-rc1 regressed ODROID 
>>>> support and
>>>> suspend stopped working on those boards, due to unknown reasons 
>>>> still being
>>>> investigated. It does not seem to be related to anything in this 
>>>> series,
>>>> though, so I would not consider this as a stopper.
>>>>
>>>> Changes since v2:
>>>> (https://lkml.org/lkml/2014/7/17/431)
>>>>   - added board-specific fixes for device tree sources of Trats2 
>>>> board,
>>>>   - rebased on next-20140826 of linux-next tree.
>>>>
>>>> Changes since v1:
>>>>   - dropped outer_resume() - will be handled in assembly in further 
>>>> patches,
>>>>     as support for L2C in non-secure mode gets added,
>>>>   - moved CP15 resume to assembly as it needs to be done before MMU 
>>>> is enabled,
>>>>   - surrounded CP15 save with a check for cpuid part, because it is 
>>>> valid only
>>>>     on Cortex A9,
>>>>   - rebased on next-20140717 tag of linux-next tree.
>>>>
>>>> Tomasz Figa (5):
>>>>    ARM: firmware: Introduce suspend and resume operations
>>>>    ARM: EXYNOS: Add support for firmware-assisted suspend/resume
>>>>    ARM: dts: exynos4412-trats2: Keep eMMC regulators soft-disabled
>>>>    ARM: dts: exynos4x12: Add utility macro to define pin sleep states
>>>>    ARM: dts: exynos4412-trats2: Add sleep mode pin configuration
>>>>
>>>>   Documentation/arm/firmware.txt            |  28 +--
>>>>   arch/arm/boot/dts/exynos4412-trats2.dts   | 320 
>>>> +++++++++++++++++++++++++++++-
>>>>   arch/arm/boot/dts/exynos4x12-pinctrl.dtsi |  16 ++
>>>>   arch/arm/include/asm/firmware.h           |   8 +
>>>>   arch/arm/mach-exynos/Makefile             |   1 +
>>>>   arch/arm/mach-exynos/common.h             |   4 +
>>>>   arch/arm/mach-exynos/firmware.c           |  45 +++++
>>>>   arch/arm/mach-exynos/pm.c                 |  16 +-
>>>>   arch/arm/mach-exynos/sleep.S              |  28 +++
>>>>   arch/arm/mach-exynos/smc.h                |   4 +
>>>>   10 files changed, 438 insertions(+), 32 deletions(-)
>>>>
>>>
>>> Would you consider applying this series? It has been waiting on the ML
>>> long enough (note no changes in core patches since last revision, just
>>> few more board specific patches). Thanks in advance.
>>>
>> Sure, I will. Thanks for your gentle reminder.
>>
> I've reverted this series because of following.
>
> In file included from arch/arm/mach-tegra/cpuidle-tegra114.c:17:0:
> arch/arm/mach-tegra/cpuidle-tegra114.c: In function 
> 'tegra114_idle_power_down':
> arch/arm/include/asm/firmware.h:64:24: error: too few arguments to 
> function 'firmware_ops->do_idle'
>   ((firmware_ops->op) ? firmware_ops->op(__VA_ARGS__) : (-ENOSYS))
>                         ^
> arch/arm/mach-tegra/cpuidle-tegra114.c:52:6: note: in expansion of 
> macro 'call_firmware_op'
>   if (call_firmware_op(do_idle) == -ENOSYS)
>       ^
>
> Caused by commit f5217f3b9332 ("ARM: EXYNOS: add AFTR mode support to
> firmware do_idle method").
>
> Need to fix...

I don't get why you have reverted the main feature of "Firmware-assisted 
suspend/resume
of Exynos SoCs" because of an issue on the completely independent 
patchset which adds
AFTR idle mode support. Could you please keep the "ARM: firmware: 
Introduce suspend
and resume operations" and "ARM: EXYNOS: Add support for firmware-assisted
suspend/resume" patches?

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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