drivers: entropy: Fix non-stop RNG ISR firing for STM32WB09

HoZHel · cfriedt · commit d7074f274727 · 2025-10-30T18:38:02.000-04:00
Fix the TRNG driver issue regarding non-stop ISR firing for STM32WB09 by
clearing RNG_IRQ_SR_ERROR_IRQ flag.

Signed-off-by: Ali Hozhabri &lt;ali.hozhabri@st.com&gt;
diff --git a/drivers/entropy/entropy_stm32.h b/drivers/entropy/entropy_stm32.h
@@ -55,6 +55,7 @@ static inline void ll_rng_clear_seis(RNG_TypeDef *RNGx)
 {
 #if defined(CONFIG_SOC_STM32WB09XX)
 	LL_RNG_SetResetHealthErrorFlags(RNGx, 1);
+	stm32_reg_write(&RNGx->IRQ_SR, RNG_IRQ_SR_ERROR_IRQ);
 #elif defined(CONFIG_SOC_SERIES_STM32WB0X)
 	/* STM32WB05 / STM32WB06 / STM32WB07 */
 	LL_RNG_ClearFlag_FAULT(RNGx);

Original file line number	Diff line number	Diff line change
`@@ -55,6 +55,7 @@ static inline void ll_rng_clear_seis(RNG_TypeDef *RNGx)`
`55`	`55`	`{`
`56`	`56`	`#if defined(CONFIG_SOC_STM32WB09XX)`
`57`	`57`	`LL_RNG_SetResetHealthErrorFlags(RNGx, 1);`
	`58`	`+ stm32_reg_write(&RNGx->IRQ_SR, RNG_IRQ_SR_ERROR_IRQ);`
`58`	`59`	`#elif defined(CONFIG_SOC_SERIES_STM32WB0X)`
`59`	`60`	`/* STM32WB05 / STM32WB06 / STM32WB07 */`
`60`	`61`	`LL_RNG_ClearFlag_FAULT(RNGx);`