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drivers: rtc: Fix RTC alarm when using both CONFIG_COUNTER and CONFIG_PM

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It is found that when we use CONFIG_COUNTER and CONFIG_PM concurrently,
the RTC alarm callback can be used only once (in some cases, it just
won't work at all, e.g., using CONFIG_BT). By set the DBP bit on PWR
control register 1 via LL_PWR_EnableBkUpAccess function to temporarily
disable write protection every time we assign RTC alarm, we can register
alarm callback correctly. Tested on Nucleo WB55RG.

Fixes: #68673
Signed-off-by: Krisna Resi <krisna_resi@ymail.com>
This commit is contained in:
Krisna Resi 2024-03-13 15:32:50 +07:00 committed by Fabio Baltieri
parent 0907aff2ae
commit 7dd7175336
1 changed files with 12 additions and 0 deletions
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12
drivers/counter/counter_ll_stm32_rtc.c
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@ -240,6 +240,12 @@ tick_t rtc_stm32_read(const struct device *dev)
#endif /* CONFIG_COUNTER_RTC_STM32_SUBSECONDS */
ARG_UNUSED(dev);
/* Enable Backup access */
#if defined(PWR_CR_DBP) || defined(PWR_CR1_DBP) || \
defined(PWR_DBPCR_DBP) || defined(PWR_DBPR_DBP)
LL_PWR_EnableBkUpAccess();
#endif /* PWR_CR_DBP || PWR_CR1_DBP || PWR_DBPR_DBP */
/* Read time and date registers. Make sure value of the previous register
* hasn't been changed while reading the next one.
*/
@ -295,6 +301,12 @@ tick_t rtc_stm32_read(const struct device *dev)
ARG_UNUSED(dev);
/* Enable Backup access */
#if defined(PWR_CR_DBP) || defined(PWR_CR1_DBP) || \
defined(PWR_DBPCR_DBP) || defined(PWR_DBPR_DBP)
LL_PWR_EnableBkUpAccess();
#endif /* PWR_CR_DBP || PWR_CR1_DBP || PWR_DBPR_DBP */
rtc_time = LL_RTC_TIME_Get(RTC);
ticks = rtc_time;