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