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pm: Better return type for pm_system_suspend

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Instead of returning PM_STATE_ACTIVE for when the cpu didn't enter a
low power state and a different state when it entered, but has
already left the state and is active again, it changes
pm_system_suspend to return true when the cpu has entered a low power
state and false otherwise.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2021-10-30 23:13:08 -07:00 • committed by Anas Nashif
commit 9444480c7b
4 changed files with 8 additions and 6 deletions
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4
kernel/idle.c
View file

@ -32,7 +32,7 @@ static void pm_save_idle(void)
/*
* Call the suspend hook function of the soc interface to allow
* entry into a low power state. The function returns
* PM_STATE_ACTIVE if low power state was not entered, in which
* false if low power state was not entered, in which
* case, kernel does normal idle processing.
*
* This function is entered with interrupts disabled. If a low power
@ -42,7 +42,7 @@ static void pm_save_idle(void)
* idle processing re-enables interrupts which is essential for
* the kernel's scheduling logic.
*/
if (pm_system_suspend(ticks) == PM_STATE_ACTIVE) {
if (pm_system_suspend(ticks) == false) {
k_cpu_idle();
}
#endif

4
kernel/include/kernel_internal.h
View file

@ -240,8 +240,10 @@ void z_mem_manage_boot_finish(void);
*
* This function is entered with interrupts disabled. It should re-enable
* interrupts if it had entered a power state.
*
* @return True if the system suspended, otherwise return false
*/
enum pm_state pm_system_suspend(int32_t ticks);
bool pm_system_suspend(int32_t ticks);
/**
* Notify exit from kernel idling after PM operations

4
subsys/pm/power.c
View file

@ -267,7 +267,7 @@ static enum pm_state _handle_device_abort(struct pm_state_info info)
}
#endif
enum pm_state pm_system_suspend(int32_t ticks)
bool pm_system_suspend(int32_t ticks)
{
uint8_t id = _current_cpu->id;
@ -340,7 +340,7 @@ enum pm_state pm_system_suspend(int32_t ticks)
k_sched_unlock();
SYS_PORT_TRACING_FUNC_EXIT(pm, system_suspend, ticks,
z_power_states[id].state);
return z_power_states[id].state;
return true;
}
void pm_notifier_register(struct pm_notifier *notifier)

2
subsys/tracing/sysview/SYSVIEW_Zephyr.txt
View file

@ -162,7 +162,7 @@ TaskState 0xBF 1=dummy, 2=Waiting, 4=New, 8=Terminated, 16=Suspended, 32=Termina
154 k_lifo_alloc_put lifo=%I, data=%I
155 pm_system_suspend ticks=%u | Returns %PowerState
155 pm_system_suspend ticks=%u | Returns %Bool
156 pm_device_runtime_get dev=%I | Returns %u
157 pm_device_runtime_put dev=%I | Returns %u
158 pm_device_runtime_put_async dev=%I | Returns %u