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pm: prevent entering light sleep again immediately after wakeup

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When light sleep is finished on one CPU, it is possible that the other
CPU will enter light sleep again very soon, before interrupts on the
first CPU get a chance to run. To avoid such situation, set a flag
for the other CPU to skip light sleep attempt.
This commit is contained in:
Ivan Grokhotkov 2018-11-01 19:38:48 +08:00
parent 22dd3103bd
commit 0716e65955
1 changed files with 34 additions and 3 deletions
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37
components/esp32/pm_esp32.c
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@ -86,6 +86,15 @@ static uint32_t s_ccount_mul;
* to be invoked or not.
*/
static bool s_skipped_light_sleep[portNUM_PROCESSORS];
#if portNUM_PROCESSORS == 2
/* When light sleep is finished on one CPU, it is possible that the other CPU
* will enter light sleep again very soon, before interrupts on the first CPU
* get a chance to run. To avoid such situation, set a flag for the other CPU to
* skip light sleep attempt.
*/
static bool s_skip_light_sleep[portNUM_PROCESSORS];
#endif // portNUM_PROCESSORS == 2
#endif // CONFIG_FREERTOS_USE_TICKLESS_IDLE
/* Indicates to the ISR hook that CCOMPARE needs to be updated on the given CPU.
@ -481,14 +490,35 @@ void esp_pm_impl_waiti()
#if CONFIG_FREERTOS_USE_TICKLESS_IDLE
void IRAM_ATTR vApplicationSleep( TickType_t xExpectedIdleTime )
static inline bool IRAM_ATTR should_skip_light_sleep(int core_id)
{
portENTER_CRITICAL(&s_switch_lock);
int core_id = xPortGetCoreID();
#if portNUM_PROCESSORS == 2
if (s_skip_light_sleep[core_id]) {
s_skip_light_sleep[core_id] = false;
s_skipped_light_sleep[core_id] = true;
return true;
}
#endif // portNUM_PROCESSORS == 2
if (s_mode != PM_MODE_LIGHT_SLEEP || s_is_switching) {
s_skipped_light_sleep[core_id] = true;
} else {
s_skipped_light_sleep[core_id] = false;
}
return s_skipped_light_sleep[core_id];
}
static inline void IRAM_ATTR other_core_should_skip_light_sleep(int core_id)
{
#if portNUM_PROCESSORS == 2
s_skip_light_sleep[!core_id] = true;
#endif
}
void IRAM_ATTR vApplicationSleep( TickType_t xExpectedIdleTime )
{
portENTER_CRITICAL(&s_switch_lock);
int core_id = xPortGetCoreID();
if (!should_skip_light_sleep(core_id)) {
/* Calculate how much we can sleep */
int64_t next_esp_timer_alarm = esp_timer_get_next_alarm();
int64_t now = esp_timer_get_time();
@ -523,6 +553,7 @@ void IRAM_ATTR vApplicationSleep( TickType_t xExpectedIdleTime )
;
}
}
other_core_should_skip_light_sleep(core_id);
}
}
portEXIT_CRITICAL(&s_switch_lock);