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drivers: uart: stm32: Complete wakeup feature

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Serial wakeup feature was only working whe DBG in Stop mode setting
was enabled.
Add required changes to make it functional also when this configuration
isn't set.

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
This commit is contained in:
Erwan Gouriou 2023-11-16 12:17:59 +01:00 • committed by Carles Cufí
commit e5ab70b724
1 changed files with 19 additions and 0 deletions
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19
drivers/serial/uart_stm32.c
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@ -1278,6 +1278,18 @@ static void uart_stm32_isr(const struct device *dev)
/* Clear errors */
uart_stm32_err_check(dev);
#endif /* CONFIG_UART_ASYNC_API */
#ifdef CONFIG_PM
if (LL_USART_IsEnabledIT_WKUP(config->usart) &&
LL_USART_IsActiveFlag_WKUP(config->usart)) {
LL_USART_ClearFlag_WKUP(config->usart);
#ifdef USART_ISR_REACK
while (LL_USART_IsActiveFlag_REACK(config->usart) == 0) {
}
#endif
}
#endif
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN || CONFIG_UART_ASYNC_API || CONFIG_PM */
@ -2005,7 +2017,14 @@ static int uart_stm32_init(const struct device *dev)
* CONFIG_PM_DEVICE=n : Always active
* CONFIG_PM_DEVICE=y : Controlled by pm_device_wakeup_enable()
*/
LL_USART_Disable(config->usart);
LL_USART_SetWKUPType(config->usart, LL_USART_WAKEUP_ON_RXNE);
LL_USART_EnableIT_WKUP(config->usart);
LL_USART_ClearFlag_WKUP(config->usart);
LL_USART_EnableInStopMode(config->usart);
LL_USART_Enable(config->usart);
if (config->wakeup_line != STM32_EXTI_LINE_NONE) {
/* Prepare the WAKEUP with the expected EXTI line */
LL_EXTI_EnableIT_0_31(BIT(config->wakeup_line));