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[Backport v4.1-branch] drivers: entropy: Fix non-stop RNG ISR firing for STM32WB09 #99162

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Merged
merged 2 commits into from
Nov 17, 2025
Merged

[Backport v4.1-branch] drivers: entropy: Fix non-stop RNG ISR firing for STM32WB09 #99162

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1e7dcc2
drivers: entropy: Fix non-stop RNG ISR firing for STM32WB09
HoZHel Nov 7, 2025
041af34
drivers: entropy: Modify the recover_seed_error function for WB0x
HoZHel Nov 7, 2025
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7 changes: 6 additions & 1 deletion drivers/entropy/entropy_stm32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -301,9 +301,14 @@ static int recover_seed_error(RNG_TypeDef *rng)
{
ll_rng_clear_seis(rng);

#if !defined(CONFIG_SOC_SERIES_STM32WB0X)
/* After a noise source error is detected, 12 words must be read from the RNG_DR register
* and discarded to restart the entropy generation.
*/
for (int i = 0; i < 12; ++i) {
(void)ll_rng_read_rand_data(rng);
}
#endif /* !CONFIG_SOC_SERIES_STM32WB0X */

if (ll_rng_is_active_seis(rng) != 0) {
return -EIO;
Expand Down Expand Up @@ -419,7 +424,7 @@ static uint16_t generate_from_isr(uint8_t *buf, uint16_t len)
byte = random_byte_get();
#if !IRQLESS_TRNG
NVIC_ClearPendingIRQ(IRQN);
#endif /* IRQLESS_TRNG */
#endif /* !IRQLESS_TRNG */

if (byte < 0) {
continue;
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1 change: 1 addition & 0 deletions drivers/entropy/entropy_stm32.h
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Expand Up @@ -56,6 +56,7 @@ static inline void ll_rng_clear_seis(RNG_TypeDef *RNGx)
#if defined(CONFIG_SOC_SERIES_STM32WB0X)
# if defined(CONFIG_SOC_STM32WB09XX)
LL_RNG_SetResetHealthErrorFlags(RNGx, 1);
WRITE_REG(RNGx->IRQ_SR, RNG_IRQ_SR_ERROR_IRQ);
# else
LL_RNG_ClearFlag_FAULT(RNGx);
# endif
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