linux-kernel - Re: [PATCH v5 0/5] ARM: EXYNOS: cpuidle: fix AFTR mode on boards with secure firmware enabled

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Message-ID: <53E0E13E.3@linaro.org>
Date:	Tue, 05 Aug 2014 15:50:54 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>
CC:	Tomasz Figa <t.figa@...sung.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH v5 0/5] ARM: EXYNOS: cpuidle: fix AFTR mode on boards
 with secure firmware enabled

On 08/05/2014 03:34 PM, Bartlomiej Zolnierkiewicz wrote:
> Hi,
>
> This patch series adds support for AFTR idle mode on boards with
> secure firmware enabled and allows EXYNOS cpuidle driver usage on
> Exynos4x12 SoCs.
>
> It has been tested on Trats2 board (using Exynos4412 SoC with secure
> firmware enabled) on which AFTR mode reduces power consumption by ~12%
> when EXYNOS cpuidle driver is enabled (in both cases the default
> exynos_defconfig config is used and CPU1-3 are offlined).

Hi Bartlomiej,

I tested your patchset on an odroid-u2. When the cpuidle driver is 
enabled and the cpu1-3 are offlined, the kernel hangs.

If I disable the AFTR state on cpuidle, and offline the 1-3, it works as 
expected. So there is something wrong with the AFTR on the odroid board.

> Depends on:
> - next-20140804 branch of linux-next kernel tree
> - [PATCH v5][next-20140804] ARM: EXYNOS: Fix suspend/resume sequences
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg35262.html)
> - [PATCH v2 0/2] Firmware-assisted suspend/resume of Exynos SoCs
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg34282.html)
>
> Changes since v4:
> - rebased on top of next-20140804 +
>    [PATCH v5][next-20140804] ARM: EXYNOS: Fix suspend/resume sequences
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg35262.html)
>    [PATCH v2 0/2] Firmware-assisted suspend/resume of Exynos SoCs
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg34282.html)
> - call exynos_save_cp15() only on A9 type core (this is needed for the future
>    Exynos3250 SoC support)
>
> Changes since v3:
> - rebased on top of next-20140804 +
>    [PATCH v4][next-20140804] ARM: EXYNOS: Fix suspend/resume sequences
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg35192.html)
>    [PATCH v2 0/2] Firmware-assisted suspend/resume of Exynos SoCs
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg34282.html)
> - (re-)added patch fixing S5P_CENTRAL_SEQ_OPTION register setup
>
> Changes since v2:
> - rebased on top of next-20140708 +
>    [PATCH 5/6] ARM: EXYNOS: Fix suspend/resume sequencies
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg32809.html)
>    [with rejects fixed]
>    [PATCH 6/6] ARM: EXYNOS: Register cpuidle device only on Exynos4210 and 5250
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg32808.html)
>    [PATCH 0/2] Firmware-assisted suspend/resume of Exynos SoCs
>    (http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg32991.html)
>    [with rejects fixed in patch #2]
> - addressed review comments from Tomasz Figa and Daniel Lezcano
>
> Changes since v1:
> - synced against next-20140602
> - added missing Acked-by-s
>
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
>
>
> Bartlomiej Zolnierkiewicz (5):
>    ARM: EXYNOS: PM: replace EXYNOS_BOOT_VECTOR_* macros by static inlines
>    ARM: EXYNOS: add AFTR mode support to firmware do_idle method
>    ARM: EXYNOS: cpuidle: add secure firmware support to AFTR mode code
>    ARM: EXYNOS: PM: fix register setup for AFTR mode code
>    ARM: EXYNOS: cpuidle: allow driver usage on Exynos4x12 SoCs
>
>   arch/arm/include/asm/firmware.h |  2 +-
>   arch/arm/mach-exynos/common.h   |  5 ++++
>   arch/arm/mach-exynos/exynos.c   |  4 ++-
>   arch/arm/mach-exynos/firmware.c | 34 ++++++++++++++++-------
>   arch/arm/mach-exynos/pm.c       | 60 ++++++++++++++++++++++++-----------------
>   5 files changed, 70 insertions(+), 35 deletions(-)
>


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