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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2015-01-26 18:33:44 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2015-01-27 11:35:33 +0000
commitaf3cfdbf56b91785650f54e7c9a899d814b4b9fb (patch)
treed3f8f97239085af0b605ad945812ac198f3d18ca /drivers/cpuidle
parentc623b33b4e9599c6ac5076f7db7369eb9869aa04 (diff)
downloadlinux-af3cfdbf56b91785650f54e7c9a899d814b4b9fb.tar.bz2
arm64: kernel: remove ARM64_CPU_SUSPEND config option
ARM64_CPU_SUSPEND config option was introduced to make code providing context save/restore selectable only on platforms requiring power management capabilities. Currently ARM64_CPU_SUSPEND depends on the PM_SLEEP config option which in turn is set by the SUSPEND config option. The introduction of CPU_IDLE for arm64 requires that code configured by ARM64_CPU_SUSPEND (context save/restore) should be compiled in in order to enable the CPU idle driver to rely on CPU operations carrying out context save/restore. The ARM64_CPUIDLE config option (ARM64 generic idle driver) is therefore forced to select ARM64_CPU_SUSPEND, even if there may be (ie PM_SLEEP) failed dependencies, which is not a clean way of handling the kernel configuration option. For these reasons, this patch removes the ARM64_CPU_SUSPEND config option and makes the context save/restore dependent on CPU_PM, which is selected whenever either SUSPEND or CPU_IDLE are configured, cleaning up dependencies in the process. This way, code previously configured through ARM64_CPU_SUSPEND is compiled in whenever a power management subsystem requires it to be present in the kernel (SUSPEND || CPU_IDLE), which is the behaviour expected on ARM64 kernels. The cpu_suspend and cpu_init_idle CPU operations are added only if CPU_IDLE is selected, since they are CPU_IDLE specific methods and should be grouped and defined accordingly. PSCI CPU operations are updated to reflect the introduced changes. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Will Deacon <will.deacon@arm.com> Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/Kconfig.arm641
-rw-r--r--drivers/cpuidle/cpuidle-arm64.c1
2 files changed, 0 insertions, 2 deletions
diff --git a/drivers/cpuidle/Kconfig.arm64 b/drivers/cpuidle/Kconfig.arm64
index d0a08ed1b2ee..6effb3656735 100644
--- a/drivers/cpuidle/Kconfig.arm64
+++ b/drivers/cpuidle/Kconfig.arm64
@@ -4,7 +4,6 @@
config ARM64_CPUIDLE
bool "Generic ARM64 CPU idle Driver"
- select ARM64_CPU_SUSPEND
select DT_IDLE_STATES
help
Select this to enable generic cpuidle driver for ARM64.
diff --git a/drivers/cpuidle/cpuidle-arm64.c b/drivers/cpuidle/cpuidle-arm64.c
index 80704b931ba4..39a2c62716c3 100644
--- a/drivers/cpuidle/cpuidle-arm64.c
+++ b/drivers/cpuidle/cpuidle-arm64.c
@@ -19,7 +19,6 @@
#include <linux/of.h>
#include <asm/cpuidle.h>
-#include <asm/suspend.h>
#include "dt_idle_states.h"