feat(pm): change power down prepare position

components/esp_hw_support/sleep_modes.c

@@ -624,14 +624,6 @@ static esp_err_t IRAM_ATTR esp_sleep_start(uint32_t pd_flags, esp_sleep_mode_t m
     // Will switch to XTAL turn down MSPI speed
     mspi_timing_change_speed_mode_cache_safe(true);
 
-    /*
-    Since the modem requires a PLL clock to access modem REG,
-    it is necessary to back up the mac/bb REG before disabling the PLL clock.
-    */
-#if SOC_PM_RETENTION_HAS_CLOCK_BUG
-    mac_bb_power_down_prepare();
-#endif // SOC_PM_RETENTION_HAS_CLOCK_BUG
-
     // Save current frequency and switch to XTAL
     rtc_cpu_freq_config_t cpu_freq_config;
     rtc_clk_cpu_freq_get_config(&cpu_freq_config);

components/esp_pm/pm_impl.c

@@ -967,6 +967,13 @@ void esp_pm_impl_idle_hook(void)
     && !periph_should_skip_light_sleep()
 #endif
     ) {
+        /*
+        Since the modem requires a PLL clock to access modem REG,
+        it is necessary to back up the mac/bb REG before disabling the PLL clock.
+        */
+#if SOC_PM_RETENTION_HAS_CLOCK_BUG
+        mac_bb_power_down_prepare();
+#endif // SOC_PM_RETENTION_HAS_CLOCK_BUG
         esp_pm_lock_release(s_rtos_lock_handle[core_id]);
         s_core_idle[core_id] = true;
     }