linux-kernel - Re: [PATCH v3] ARM: EXYNOS: Fix suspend/resume sequences

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Message-ID: <53CCEA37.4060104@gmail.com>
Date:	Mon, 21 Jul 2014 12:23:51 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Kukjin Kim <kgene.kim@...sung.com>, Kukjin Kim <kgene@...nel.org>,
	Kukjin Kim <kgene.kim@...il.com>
CC:	Tomasz Figa <t.figa@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	Chander Kashyap <k.chander@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v3] ARM: EXYNOS: Fix suspend/resume sequences

Hi,

On 15.07.2014 16:26, Tomasz Figa wrote:
> Forgot to CC Daniel and linux-pm. Sorry for the noise.
> 
> On 15.07.2014 16:24, Tomasz Figa wrote:
>> Due to recent consolidation of Exynos suspend and cpuidle code, some
>> parts of suspend and resume sequences are executed two times, once from
>> exynos_pm_syscore_ops and then from exynos_cpu_pm_notifier() and thus it
>> breaks suspend, at least on Exynos4-based boards. In addition, simple
>> core power down from a cpuidle driver could, in case of CPU 0 could
>> result in calling functions that are specific to suspend and deeper idle
>> states.
>>
>> This patch fixes the issue by moving those operations outside the CPU PM
>> notifier into suspend and AFTR code paths. This leads to a bit of code
>> duplication, but allows additional code simplification, so in the end
>> more code is removed than added.
>>
>> Signed-off-by: Tomasz Figa <t.figa@...sung.com>
>> ---
>>  arch/arm/mach-exynos/pm.c        | 164 ++++++++++++++++++---------------------
>>  drivers/cpuidle/cpuidle-exynos.c |  25 +-----
>>  2 files changed, 80 insertions(+), 109 deletions(-)
>>

This is an important regression fix for 3.16 and today 3.16-rc6 was
already released...

Kukjin, could you pick up this patch and few others you missed and make
sure that it is included in 3.16-rc7? If you are busy, maybe Arnd or
Olof could take them directly?

Best regards,
Tomasz
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