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drivers: serial: stm32: prevent suspend to ram when operation in progress

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Prevent the system to enter Suspend to RAM state while UART operation is
in progress.

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
This commit is contained in:
Guillaume Gautier 2024-01-17 09:02:53 +01:00 • committed by Carles Cufí
commit be26c71fd4
1 changed files with 6 additions and 0 deletions
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6
drivers/serial/uart_stm32.c
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@ -96,6 +96,9 @@ static void uart_stm32_pm_policy_state_lock_get(const struct device *dev)
if (!data->pm_policy_state_on) {
data->pm_policy_state_on = true;
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
if (IS_ENABLED(CONFIG_PM_S2RAM)) {
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES);
}
}
}
@ -106,6 +109,9 @@ static void uart_stm32_pm_policy_state_lock_put(const struct device *dev)
if (data->pm_policy_state_on) {
data->pm_policy_state_on = false;
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
if (IS_ENABLED(CONFIG_PM_S2RAM)) {
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES);
}
}
}
#endif /* CONFIG_PM */