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

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

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
This commit is contained in:
Guillaume Gautier 2024-01-02 14:54:54 +01:00 committed by Carles Cufí
parent 276fc569d6
commit b8fdcbb59e
1 changed files with 6 additions and 0 deletions
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6
drivers/entropy/entropy_stm32.c
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@ -417,6 +417,9 @@ static int start_pool_filling(bool wait)
* rng pool is filled.
*/
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);
}
acquire_rng();
irq_enable(IRQN);
@ -546,6 +549,9 @@ static void stm32_rng_isr(const void *arg)
irq_disable(IRQN);
release_rng();
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);
}
entropy_stm32_rng_data.filling_pools = false;
}