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| author | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2015-01-24 14:05:50 +0900 |
|---|---|---|
| committer | Kukjin Kim <kgene@kernel.org> | 2015-01-30 08:39:15 +0900 |
| commit | 712eddf70225ab5ae65e946e22d2dfe6b93e8dd1 (patch) | |
| tree | 62477a0a4b364cd2e87786481ee6dfe03e3fd569 /drivers/cpuidle/Kconfig.arm | |
| parent | 865e8b76a04d018f23d809ebf735c52105e3adb2 (diff) | |
| download | linux-712eddf70225ab5ae65e946e22d2dfe6b93e8dd1.tar.gz linux-712eddf70225ab5ae65e946e22d2dfe6b93e8dd1.tar.bz2 linux-712eddf70225ab5ae65e946e22d2dfe6b93e8dd1.zip | |
cpuidle: exynos: add coupled cpuidle support for exynos4210
The following patch 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.
The patch 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
Cc: Colin Cross <ccross@google.com>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
Diffstat (limited to 'drivers/cpuidle/Kconfig.arm')
| -rw-r--r-- | drivers/cpuidle/Kconfig.arm | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm index 8c16ab20fb15..8e07c9419153 100644 --- a/drivers/cpuidle/Kconfig.arm +++ b/drivers/cpuidle/Kconfig.arm @@ -55,6 +55,7 @@ config ARM_AT91_CPUIDLE config ARM_EXYNOS_CPUIDLE bool "Cpu Idle Driver for the Exynos processors" depends on ARCH_EXYNOS + select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP help Select this to enable cpuidle for Exynos processors |