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ARM: MCPM: remove residency argument from mcpm_cpu_suspend()

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This is currently unused.

If a suspend must be limited to CPU level only by preventing the last man
from triggering a cluster level suspend then this should be determined
according to many other criteria the MCPM layer is currently not aware of.
It is unlikely that mcpm_cpu_suspend() would be the proper conduit for
that information anyway.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Dave Martin <Dave.Martin@arm.com>
This commit is contained in:
Nicolas Pitre 2015-04-28 15:51:19 -04:00
parent 1c2c7d51c8
commit 7895f73169
4 changed files with 8 additions and 25 deletions
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2
arch/arm/common/mcpm_entry.c
View File

@ -321,7 +321,7 @@ int mcpm_wait_for_cpu_powerdown(unsigned int cpu, unsigned int cluster)
return ret;
}
void mcpm_cpu_suspend(u64 expected_residency)
void mcpm_cpu_suspend(void)
{
if (WARN_ON_ONCE(!platform_ops))
return;

15
arch/arm/include/asm/mcpm.h
View File

@ -137,17 +137,12 @@ int mcpm_wait_for_cpu_powerdown(unsigned int cpu, unsigned int cluster);
/**
* mcpm_cpu_suspend - bring the calling CPU in a suspended state
*
* @expected_residency: duration in microseconds the CPU is expected
* to remain suspended, or 0 if unknown/infinity.
*
* The calling CPU is suspended. The expected residency argument is used
* as a hint by the platform specific backend to implement the appropriate
* sleep state level according to the knowledge it has on wake-up latency
* for the given hardware.
* The calling CPU is suspended. This is similar to mcpm_cpu_power_down()
* except for possible extra platform specific configuration steps to allow
* an asynchronous wake-up e.g. with a pending interrupt.
*
* If this CPU is found to be the "last man standing" in the cluster
* then the cluster may be prepared for power-down too, if the expected
* residency makes it worthwhile.
* then the cluster may be prepared for power-down too.
*
* This must be called with interrupts disabled.
*
@ -157,7 +152,7 @@ int mcpm_wait_for_cpu_powerdown(unsigned int cpu, unsigned int cluster);
* This will return if mcpm_platform_register() has not been called
* previously in which case the caller should take appropriate action.
*/
void mcpm_cpu_suspend(u64 expected_residency);
void mcpm_cpu_suspend(void);
/**
* mcpm_cpu_powered_up - housekeeping workafter a CPU has been powered up

8
arch/arm/mach-exynos/suspend.c
View File

@ -311,13 +311,7 @@ static int exynos5420_cpu_suspend(unsigned long arg)
if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM)) {
mcpm_set_entry_vector(cpu, cluster, exynos_cpu_resume);
/*
* Residency value passed to mcpm_cpu_suspend back-end
* has to be given clear semantics. Set to 0 as a
* temporary value.
*/
mcpm_cpu_suspend(0);
mcpm_cpu_suspend();
}
pr_info("Failed to suspend the system\n");

8
drivers/cpuidle/cpuidle-big_little.c
View File

@ -108,13 +108,7 @@ static int notrace bl_powerdown_finisher(unsigned long arg)
unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
mcpm_set_entry_vector(cpu, cluster, cpu_resume);
/*
* Residency value passed to mcpm_cpu_suspend back-end
* has to be given clear semantics. Set to 0 as a
* temporary value.
*/
mcpm_cpu_suspend(0);
mcpm_cpu_suspend();
/* return value != 0 means failure */
return 1;