[PATCH v3 0/2] cpuidle: exynos: add coupled cpuidle support for Exynos4210

From: Bartlomiej Zolnierkiewicz
Date: Fri Jan 23 2015 - 11:25:25 EST


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 (commit: 9663ad71912b) of linux-samsung.git
kernel tree

Changes since v2:
- rebased on top of for-next branch (commit: 9663ad71912b) of
linux-samsung.git kernel tree

Changes since v1:
- 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 | 76 ++++++++++++++-
include/linux/platform_data/cpuidle-exynos.h | 20 ++++
8 files changed, 234 insertions(+), 10 deletions(-)
create mode 100644 include/linux/platform_data/cpuidle-exynos.h

--
1.8.2.3

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