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drivers: clock_control: stm32wba: Fix chain loaded applications case

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In case of chain loaded application with PLL set as the sysclk source,
directly exit the init function.
This also applies to exit from stop mode and was tested successfully.

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
This commit is contained in:
Erwan Gouriou 2024-03-12 16:40:34 +01:00 committed by Fabio Baltieri
parent 3c42daee9c
commit 930e03fdfd
1 changed files with 11 additions and 15 deletions
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26
drivers/clock_control/clock_stm32_ll_wba.c
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@ -355,19 +355,6 @@ static int set_up_plls(void)
int r;
uint32_t vco_input_range;
/*
* Case of chain-loaded applications:
* Switch to HSI and disable the PLL before configuration.
* (Switching to HSI makes sure we have a SYSCLK source in
* case we're currently running from the PLL we're about to
* turn off and reconfigure.)
*
*/
if (LL_RCC_GetSysClkSource() == LL_RCC_SYS_CLKSOURCE_STATUS_PLL1R) {
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
stm32_clock_switch_to_hsi();
}
LL_RCC_PLL1_Disable();
/* Configure PLL source */
@ -511,11 +498,20 @@ int stm32_clock_control_init(const struct device *dev)
ARG_UNUSED(dev);
if (IS_ENABLED(STM32_SYSCLK_SRC_PLL) &&
(LL_RCC_GetSysClkSource() == LL_RCC_SYS_CLKSOURCE_STATUS_PLL1R)) {
/* In case of chainloaded application, it may happen that PLL
* was already configured as sysclk src by bootloader.
* Don't test other cases as there are multiple options but
* they will be handled smoothly by the function.
*/
SystemCoreClock = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC;
return 0;
}
old_flash_freq = RCC_CALC_FLASH_FREQ(HAL_RCC_GetSysClockFreq(),
GET_CURRENT_FLASH_PRESCALER());
/* Set up individual enabled clocks */
set_up_fixed_clock_sources();