fix(clk): rtc_clk_cpu_freq_set_xtal will always disable CPU's PLL

Align C6/H2/C5/C61 rtc_clk_cpu_freq_set_xtal behavior to other chips
For PMU supported chips, powering down CPU PLL in sleep will be done by PMU, not sleep code

components/esp_hw_support/include/esp_private/rtc_clk.h

@@ -18,11 +18,12 @@ extern "C" {
  * @brief Switch CPU clock source to XTAL, and let cpu frequency equal to main XTAL frequency.
  *
  * This function does not disable CPU's source PLL. If the PLL requires to be disabled to save power, please call
- * `rtc_clk_cpu_freq_set_xtal` instead. It does one extra check (if necessary) to see whether can disable the
- * corresponding PLL after switching the CPU clock source to XTAL.
+ * `rtc_clk_cpu_freq_set_xtal` instead. It will always disable the corresponding PLL after switching the CPU clock
+ * source to XTAL (except for S2).
  *
- * Currently, this function should only be called in `esp_restart_noos` and `esp_restart_noos_dig` to switch the CPU
- * clock source back to XTAL (by default) before reset.
+ * Currently, this function is only called in `esp_restart_noos` and `esp_restart_noos_dig` to switch the CPU
+ * clock source back to XTAL (by default) before reset, and in `esp_sleep_start` to switch CPU clock source to XTAL
+ * before entering sleep for PMU supported chips.
  */
 void rtc_clk_cpu_set_to_default_config(void);
 
@@ -32,12 +33,6 @@ void rtc_clk_cpu_set_to_default_config(void);
  * Currently, this function is only used for tracking whether USB Serial/JTAG is using the 48MHz PHY clock
  *
  * Note: Calling this function only helps to not disable the BBPLL clock in `rtc_clk_cpu_freq_set_config`.
- *       For light and deep sleep, whether to disable the BBPLL in the internal call to `rtc_clk_cpu_freq_set_xtal`
- *       varies for targets.
- *       On ESP32C3/S3, USB CDC device can not function properly during sleep due to the lack of APB clock. Therefore.
- *       `rtc_clk_cpu_freq_set_xtal` will always disable BBPLL, no matter whether BBPLL has any consumer.
- *       On ESP32C6/H2, USB CDC device can maintain the minimum connection with the host during sleep, so
- *       `rtc_clk_cpu_freq_set_xtal` will check for BBPLL consumers, and keep BBPLL if USB Serial/JTAG is in use.
  */
 void rtc_clk_bbpll_add_consumer(void);
 

components/esp_hw_support/port/esp32c5/include/soc/rtc.h

@@ -307,8 +307,9 @@ void rtc_clk_cpu_freq_get_config(rtc_cpu_freq_config_t *out_config);
  * rtc_clk_cpu_freq_set_config when a switch to XTAL is needed.
  * Assumes that XTAL frequency has been determined — don't call in startup code.
  *
- * @note On ESP32C5, this function will check whether BBPLL can be disabled. If there is no consumer, then BBPLL will be
- * turned off. The behaviour is the same as using rtc_clk_cpu_freq_set_config to switch cpu clock source to XTAL.
+ * @note This function always disables BBPLL after switching the CPU clock source to XTAL for power saving purpose.
+ * If this is unwanted, please use rtc_clk_cpu_freq_set_config. It helps to check whether USB Serial JTAG is in use,
+ * if so, then BBPLL will not be turned off.
  */
 void rtc_clk_cpu_freq_set_xtal(void);
 

components/esp_hw_support/port/esp32c5/rtc_clk.c

@@ -383,10 +383,7 @@ void rtc_clk_cpu_freq_set_config_fast(const rtc_cpu_freq_config_t *config)
 void rtc_clk_cpu_freq_set_xtal(void)
 {
     rtc_clk_cpu_set_to_default_config();
-    // We don't turn off the bbpll if some consumers depend on bbpll
-    if (!s_bbpll_digi_consumers_ref_count) {
-        rtc_clk_bbpll_disable();
-    }
+    rtc_clk_bbpll_disable();
 }
 
 void rtc_clk_cpu_set_to_default_config(void)
@@ -394,6 +391,7 @@ void rtc_clk_cpu_set_to_default_config(void)
     int freq_mhz = (int)rtc_clk_xtal_freq_get();
 
     rtc_clk_cpu_freq_to_xtal(freq_mhz, 1);
+    s_cur_pll_freq = 0; // no disable PLL, but set freq to 0 to trigger a PLL calibration after wake-up from sleep
 }
 
 void rtc_clk_cpu_freq_to_pll_and_pll_lock_release(int cpu_freq_mhz)

components/esp_hw_support/port/esp32c6/include/soc/rtc.h

@@ -338,8 +338,9 @@ void rtc_clk_cpu_freq_get_config(rtc_cpu_freq_config_t *out_config);
  * rtc_clk_cpu_freq_set_config when a switch to XTAL is needed.
  * Assumes that XTAL frequency has been determined — don't call in startup code.
  *
- * @note On ESP32C6, this function will check whether BBPLL can be disabled. If there is no consumer, then BBPLL will be
- * turned off. The behaviour is the same as using rtc_clk_cpu_freq_set_config to switch cpu clock source to XTAL.
+ * @note This function always disables BBPLL after switching the CPU clock source to XTAL for power saving purpose.
+ * If this is unwanted, please use rtc_clk_cpu_freq_set_config. It helps to check whether USB Serial JTAG is in use,
+ * if so, then BBPLL will not be turned off.
  */
 void rtc_clk_cpu_freq_set_xtal(void);
 

components/esp_hw_support/port/esp32c6/rtc_clk.c

@@ -333,10 +333,7 @@ void rtc_clk_cpu_freq_set_config_fast(const rtc_cpu_freq_config_t *config)
 void rtc_clk_cpu_freq_set_xtal(void)
 {
     rtc_clk_cpu_set_to_default_config();
-    // We don't turn off the bbpll if some consumers depend on bbpll
-    if (!s_bbpll_digi_consumers_ref_count) {
-        rtc_clk_bbpll_disable();
-    }
+    rtc_clk_bbpll_disable();
 }
 
 void rtc_clk_cpu_set_to_default_config(void)
@@ -344,6 +341,7 @@ void rtc_clk_cpu_set_to_default_config(void)
     int freq_mhz = (int)rtc_clk_xtal_freq_get();
 
     rtc_clk_cpu_freq_to_xtal(freq_mhz, 1);
+    s_cur_pll_freq = 0; // no disable PLL, but set freq to 0 to trigger a PLL calibration after wake-up from sleep
 }
 
 void rtc_clk_cpu_freq_to_pll_and_pll_lock_release(int cpu_freq_mhz)

components/esp_hw_support/port/esp32c61/include/soc/rtc.h

@@ -307,8 +307,9 @@ void rtc_clk_cpu_freq_get_config(rtc_cpu_freq_config_t *out_config);
  * rtc_clk_cpu_freq_set_config when a switch to XTAL is needed.
  * Assumes that XTAL frequency has been determined — don't call in startup code.
  *
- * @note On ESP32C61, this function will check whether BBPLL can be disabled. If there is no consumer, then BBPLL will be
- * turned off. The behaviour is the same as using rtc_clk_cpu_freq_set_config to switch cpu clock source to XTAL.
+ * @note This function always disables BBPLL after switching the CPU clock source to XTAL for power saving purpose.
+ * If this is unwanted, please use rtc_clk_cpu_freq_set_config. It helps to check whether USB Serial JTAG is in use,
+ * if so, then BBPLL will not be turned off.
  */
 void rtc_clk_cpu_freq_set_xtal(void);
 

components/esp_hw_support/port/esp32c61/rtc_clk.c

@@ -327,10 +327,7 @@ void rtc_clk_cpu_freq_set_config_fast(const rtc_cpu_freq_config_t *config)
 void rtc_clk_cpu_freq_set_xtal(void)
 {
     rtc_clk_cpu_set_to_default_config();
-    // We don't turn off the bbpll if some consumers depend on bbpll
-    if (!s_bbpll_digi_consumers_ref_count) {
-        rtc_clk_bbpll_disable();
-    }
+    rtc_clk_bbpll_disable();
 }
 
 void rtc_clk_cpu_set_to_default_config(void)
@@ -338,6 +335,7 @@ void rtc_clk_cpu_set_to_default_config(void)
     int freq_mhz = (int)rtc_clk_xtal_freq_get();
 
     rtc_clk_cpu_freq_to_xtal(freq_mhz, 1);
+    s_cur_pll_freq = 0; // no disable PLL, but set freq to 0 to trigger a PLL calibration after wake-up from sleep
 }
 
 void rtc_clk_cpu_freq_to_pll_and_pll_lock_release(int cpu_freq_mhz)

components/esp_hw_support/port/esp32h2/include/soc/rtc.h

@@ -354,8 +354,9 @@ void rtc_clk_cpu_freq_get_config(rtc_cpu_freq_config_t *out_config);
  * rtc_clk_cpu_freq_set_config when a switch to XTAL is needed.
  * Assumes that XTAL frequency has been determined — don't call in startup code.
  *
- * @note On ESP32H2, this function will check whether BBPLL can be disabled. If there is no consumer, then BBPLL will be
- * turned off. The behaviour is the same as using rtc_clk_cpu_freq_set_config to switch cpu clock source to XTAL.
+ * @note This function always disables BBPLL after switching the CPU clock source to XTAL for power saving purpose.
+ * If this is unwanted, please use rtc_clk_cpu_freq_set_config. It helps to check whether USB Serial JTAG is in use,
+ * if so, then BBPLL will not be turned off.
  */
 void rtc_clk_cpu_freq_set_xtal(void);
 

components/esp_hw_support/port/esp32h2/rtc_clk.c

@@ -393,10 +393,7 @@ void rtc_clk_cpu_freq_set_config_fast(const rtc_cpu_freq_config_t *config)
 void rtc_clk_cpu_freq_set_xtal(void)
 {
     rtc_clk_cpu_set_to_default_config();
-    // We don't turn off the bbpll if some consumers only depends on bbpll
-    if (!s_bbpll_digi_consumers_ref_count) {
-        rtc_clk_bbpll_disable();
-    }
+    rtc_clk_bbpll_disable();
 }
 
 void rtc_clk_cpu_set_to_default_config(void)
@@ -404,6 +401,7 @@ void rtc_clk_cpu_set_to_default_config(void)
     int freq_mhz = (int)rtc_clk_xtal_freq_get();
 
     rtc_clk_cpu_freq_to_xtal(freq_mhz, 1);
+    s_cur_pll_freq = 0; // no disable PLL, but set freq to 0 to trigger a PLL calibration after wake-up from sleep
 }
 
 soc_xtal_freq_t rtc_clk_xtal_freq_get(void)

components/esp_hw_support/port/esp32p4/include/soc/rtc.h

@@ -350,8 +350,8 @@ void rtc_clk_cpu_freq_get_config(rtc_cpu_freq_config_t *out_config);
  * rtc_clk_cpu_freq_set_config when a switch to XTAL is needed.
  * Assumes that XTAL frequency has been determined — don't call in startup code.
  *
- * @note On ESP32C6, this function will check whether BBPLL can be disabled. If there is no consumer, then BBPLL will be
- * turned off. The behaviour is the same as using rtc_clk_cpu_freq_set_config to switch cpu clock source to XTAL.
+ * @note On ESP32P4, this function always disables CPLL after switching the CPU clock source to XTAL,
+ * since there is no peripheral relies on CPLL clock (except Flash/PSRAM if their clock source selects CPLL).
  */
 void rtc_clk_cpu_freq_set_xtal(void);
 

components/esp_hw_support/port/esp32p4/rtc_clk.c

@@ -426,6 +426,7 @@ void rtc_clk_cpu_set_to_default_config(void)
     int freq_mhz = (int)rtc_clk_xtal_freq_get();
 
     rtc_clk_cpu_freq_to_xtal(freq_mhz, 1, true);
+    s_cur_cpll_freq = 0; // no disable PLL, but set freq to 0 to trigger a PLL calibration after wake-up from sleep
 }
 
 soc_xtal_freq_t rtc_clk_xtal_freq_get(void)

components/esp_hw_support/sleep_modes.c

@@ -810,7 +810,16 @@ static esp_err_t IRAM_ATTR esp_sleep_start(uint32_t pd_flags, esp_sleep_mode_t m
     // Save current frequency and switch to XTAL
     rtc_cpu_freq_config_t cpu_freq_config;
     rtc_clk_cpu_freq_get_config(&cpu_freq_config);
+#if SOC_PMU_SUPPORTED
+    // For PMU supported chips, CPU's PLL power can be turned off by PMU, so no need to disable the PLL at here.
+    // Leaving PLL on at this stage also helps USJ keep connection and retention operation (if they rely on this PLL).
+    rtc_clk_cpu_set_to_default_config();
+#else
+    // For earlier chips, there is no PMU module that can turn off the CPU's PLL, so it has to be disabled at here to save the power consumption.
+    // Though ESP32C3/S3 has USB CDC device, it can not function properly during sleep due to the lack of APB clock (before C6, USJ relies on APB clock to work).
+    // Therefore, we will always disable CPU's PLL (i.e. BBPLL).
     rtc_clk_cpu_freq_set_xtal();
+#endif
 
 #if SOC_PM_SUPPORT_EXT0_WAKEUP
     // Configure pins for external wakeup