linux-kernel - [PATCH v2 0/2] cpuidle: exynos: add coupled cpuidle support for Exynos4210

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Date:	Thu, 27 Nov 2014 17:51:23 +0100
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Kukjin Kim <kgene.kim@...sung.com>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Colin Cross <ccross@...gle.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	b.zolnierkie@...sung.com
Subject: [PATCH v2 0/2] cpuidle: exynos: add coupled cpuidle support for
 Exynos4210

Hi,

The following patchset adds coupled cpuidle support for Exynos4210
to an existing cpuidle-exynos driver.  As a result it enables AFTR
mode to be used by default on Exynos4210 without the need to hot
unplug CPU1 first.

This work is heavily based on earlier cpuidle-exynos4210 driver from
Daniel Lezcano:

http://www.spinics.net/lists/linux-samsung-soc/msg28134.html

Changes from Daniel's code include:
- porting code to current kernels
- fixing it to work on my setup (by using S5P_INFORM register
  instead of S5P_VA_SYSRAM one on Revison 1.1 and retrying poking
  CPU1 out of the BOOT ROM if necessary)
- fixing rare lockup caused by waiting for CPU1 to get stuck in
  the BOOT ROM (CPU hotplug code in arch/arm/mach-exynos/platsmp.c
  doesn't require this and works fine)
- moving Exynos specific code to arch/arm/mach-exynos/pm.c
- using cpu_boot_reg_base() helper instead of BOOT_VECTOR macro
- using exynos_cpu_*() helpers instead of accessing registers
  directly
- using arch_send_wakeup_ipi_mask() instead of dsb_sev()
  (this matches CPU hotplug code in arch/arm/mach-exynos/platsmp.c)
- integrating separate exynos4210-cpuidle driver into existing
  exynos-cpuidle one

patch #1 is a fix for Exynos platform PM code preparing it for
coupled cpuidle support

patch #2 adds coupled cpuidle AFTR mode for Exynos4210

The patchset depends on:
- for-next branch (760a7d4763c8) of linux-samsung.git kernel tree

v2:
- rebased on top of for-next branch (commit: 760a7d4763c8) of
  linux-samsung.git kernel tree (the patchset also applies fine
  to next-20141126 branch of linux-next kernel tree but needs
  CPUIDLE_FLAG_TIME_VALID flag usage removed to fix build)
- added Signed-off-by from Daniel Lezcano to patch #2
- added separate struct cpuidle_driver exynos_coupled_idle_driver

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics


Bartlomiej Zolnierkiewicz (2):
  ARM: EXYNOS: apply S5P_CENTRAL_SEQ_OPTION fix only when necessary
  cpuidle: exynos: add coupled cpuidle support for Exynos4210

 arch/arm/mach-exynos/common.h                |   4 +
 arch/arm/mach-exynos/exynos.c                |   4 +
 arch/arm/mach-exynos/platsmp.c               |   2 +-
 arch/arm/mach-exynos/pm.c                    | 133 ++++++++++++++++++++++++++-
 arch/arm/mach-exynos/suspend.c               |   4 +
 drivers/cpuidle/Kconfig.arm                  |   1 +
 drivers/cpuidle/cpuidle-exynos.c             |  77 +++++++++++++++-
 include/linux/platform_data/cpuidle-exynos.h |  20 ++++
 8 files changed, 235 insertions(+), 10 deletions(-)
 create mode 100644 include/linux/platform_data/cpuidle-exynos.h

-- 
1.8.2.3

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