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arm64: kernel: remove ARM64_CPU_SUSPEND config option

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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 <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Mark Rutland <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
This commit is contained in:
Lorenzo Pieralisi 2015-01-26 18:33:44 +00:00 • committed by Catalin Marinas
commit af3cfdbf56
13 changed files with 34 additions and 38 deletions
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1
drivers/cpuidle/Kconfig.arm64
View file

@ -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.

1
drivers/cpuidle/cpuidle-arm64.c
View file

@ -19,7 +19,6 @@
#include <linux/of.h>
#include <asm/cpuidle.h>
#include <asm/suspend.h>
#include "dt_idle_states.h"