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soc: arm: stm32wl: wakeup from stop clock selection based on sysclk

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When exiting Stop mode, if system clock is MSI, MSI oscillator is
selected as wakeup from stop clock; otherwise HSI16 oscillator is
selected.

It is otherwise reconfigured as MSI just after, but it slightly
increases the wake-up time and power consumption.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2021-09-24 00:02:45 +02:00 • committed by Christopher Friedt
commit 2e9cce6779
1 changed files with 9 additions and 1 deletions
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10
soc/arm/st_stm32/stm32wl/power.c
View file

@ -15,16 +15,24 @@
#include <stm32wlxx_ll_rcc.h> #include <stm32wlxx_ll_rcc.h>
#include <stm32wlxx_ll_system.h> #include <stm32wlxx_ll_system.h>
#include <clock_control/clock_stm32_ll_common.h> #include <clock_control/clock_stm32_ll_common.h>
#include <drivers/clock_control/stm32_clock_control.h>
#include <logging/log.h> #include <logging/log.h>
LOG_MODULE_DECLARE(soc, CONFIG_SOC_LOG_LEVEL); LOG_MODULE_DECLARE(soc, CONFIG_SOC_LOG_LEVEL);
/* select MSI as wake-up system clock if configured, HSI otherwise */
#if STM32_SYSCLK_SRC_MSI
#define RCC_STOP_WAKEUPCLOCK_SELECTED LL_RCC_STOP_WAKEUPCLOCK_MSI
#else
#define RCC_STOP_WAKEUPCLOCK_SELECTED LL_RCC_STOP_WAKEUPCLOCK_HSI
#endif
/* Invoke Low Power/System Off specific Tasks */ /* Invoke Low Power/System Off specific Tasks */
__weak void pm_power_state_set(struct pm_state_info info) __weak void pm_power_state_set(struct pm_state_info info)
{ {
switch (info.state) { switch (info.state) {
case PM_STATE_SUSPEND_TO_IDLE: case PM_STATE_SUSPEND_TO_IDLE:
LL_RCC_SetClkAfterWakeFromStop(LL_RCC_STOP_WAKEUPCLOCK_HSI); LL_RCC_SetClkAfterWakeFromStop(RCC_STOP_WAKEUPCLOCK_SELECTED);
LL_PWR_ClearFlag_WU(); LL_PWR_ClearFlag_WU();
switch (info.substate_id) { switch (info.substate_id) {
case 1: case 1: