fixup! fix(core): fix suspending to STOP2 mode

trezor · Jan 6, 2025 · 220fd9e · 220fd9e
1 parent 0124317
commit 220fd9e
Showing 1 changed file with 6 additions and 3 deletions.
diff --git a/core/embed/sys/powerctl/stm32u5/powerctl_suspend.c b/core/embed/sys/powerctl/stm32u5/powerctl_suspend.c
@@ -95,13 +95,16 @@ void powerctl_suspend(void) {
       // immediately after exiting STOP2 mode.
       irq_key_t irq_key = irq_lock();
 
-      // Enable PWR peripheral clock
-      // (required by the following HAL_PWREx_EnterSTOP2Mode)
+      // The PWR clock is disabled after system initialization.
+      // Re-enable it before writing to PWR registers.
       __HAL_RCC_PWR_CLK_ENABLE();
 
-      // Enter STOP2 mode
+      // Enter STOP2 low-power mode
       HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
 
+      // Disable PWR clock after use
+      __HAL_RCC_PWR_CLK_DISABLE();
+
       // Recover system clock
       SystemInit();