diff --git a/components/bootloader_support/src/bootloader_clock.c b/components/bootloader_support/src/bootloader_clock.c
index d5a1e52aba..24267cc32a 100644
--- a/components/bootloader_support/src/bootloader_clock.c
+++ b/components/bootloader_support/src/bootloader_clock.c
@@ -31,14 +31,14 @@ void bootloader_clock_configure()
     /* Set CPU to 80MHz. Keep other clocks unmodified. */
     int cpu_freq_mhz = 80;
 
-    /* On ESP32 rev 0, switching to 80MHz if clock was previously set to
+    /* On ESP32 rev 0, switching to 80/160 MHz if clock was previously set to
      * 240 MHz may cause the chip to lock up (see section 3.5 of the errata
-     * document). For rev. 0, switch to 240 instead if it was chosen in
-     * menuconfig.
+     * document). For rev. 0, switch to 240 instead if it has been enabled
+     * previously.
      */
     uint32_t chip_ver_reg = REG_READ(EFUSE_BLK0_RDATA3_REG);
     if ((chip_ver_reg & EFUSE_RD_CHIP_VER_REV1_M) == 0 &&
-            CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ == 240) {
+            DPORT_REG_GET_FIELD(DPORT_CPU_PER_CONF_REG, DPORT_CPUPERIOD_SEL) == DPORT_CPUPERIOD_SEL_240) {
         cpu_freq_mhz = 240;
     }
 
diff --git a/components/soc/esp32/include/soc/dport_reg.h b/components/soc/esp32/include/soc/dport_reg.h
index 6c23dfe639..9cc3320b39 100644
--- a/components/soc/esp32/include/soc/dport_reg.h
+++ b/components/soc/esp32/include/soc/dport_reg.h
@@ -179,6 +179,9 @@
 #define DPORT_CPUPERIOD_SEL_M  ((DPORT_CPUPERIOD_SEL_V)<<(DPORT_CPUPERIOD_SEL_S))
 #define DPORT_CPUPERIOD_SEL_V  0x3
 #define DPORT_CPUPERIOD_SEL_S  0
+#define DPORT_CPUPERIOD_SEL_80		0
+#define DPORT_CPUPERIOD_SEL_160		1
+#define DPORT_CPUPERIOD_SEL_240		2
 
 #define DPORT_PRO_CACHE_CTRL_REG          (DR_REG_DPORT_BASE + 0x040)
 /* DPORT_PRO_DRAM_HL : R/W ;bitpos:[16] ;default: 1'b0 ; */
diff --git a/components/soc/esp32/rtc_clk.c b/components/soc/esp32/rtc_clk.c
index 3156517b92..43964448c9 100644
--- a/components/soc/esp32/rtc_clk.c
+++ b/components/soc/esp32/rtc_clk.c
@@ -398,7 +398,6 @@ void rtc_clk_cpu_freq_to_xtal(int freq, int div)
     REG_WRITE(APB_CTRL_XTAL_TICK_CONF_REG, freq * MHZ / REF_CLK_FREQ - 1);
     /* switch clock source */
     REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_SOC_CLK_SEL, RTC_CNTL_SOC_CLK_SEL_XTL);
-    DPORT_REG_WRITE(DPORT_CPU_PER_CONF_REG, 0); /* clear DPORT_CPUPERIOD_SEL */
     rtc_clk_apb_freq_update(freq * MHZ);
     /* lower the voltage */
     if (freq <= 2) {
@@ -414,7 +413,6 @@ static void rtc_clk_cpu_freq_to_8m()
     REG_SET_FIELD(RTC_CNTL_REG, RTC_CNTL_DIG_DBIAS_WAK, DIG_DBIAS_XTAL);
     REG_SET_FIELD(APB_CTRL_SYSCLK_CONF_REG, APB_CTRL_PRE_DIV_CNT, 0);
     REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_SOC_CLK_SEL, RTC_CNTL_SOC_CLK_SEL_8M);
-    DPORT_REG_WRITE(DPORT_CPU_PER_CONF_REG, 0); // clear DPORT_CPUPERIOD_SEL
     rtc_clk_apb_freq_update(RTC_FAST_CLK_FREQ_8M);
 }
 
@@ -455,14 +453,14 @@ static void rtc_clk_bbpll_enable()
 static void rtc_clk_cpu_freq_to_pll_mhz(int cpu_freq_mhz)
 {
     int dbias = DIG_DBIAS_80M_160M;
-    int per_conf = 0;
+    int per_conf = DPORT_CPUPERIOD_SEL_80;
     if (cpu_freq_mhz == 80) {
         /* nothing to do */
     } else if (cpu_freq_mhz == 160) {
-        per_conf = 1;
+        per_conf = DPORT_CPUPERIOD_SEL_160;
     } else if (cpu_freq_mhz == 240) {
         dbias = DIG_DBIAS_240M;
-        per_conf = 2;
+        per_conf = DPORT_CPUPERIOD_SEL_240;
     } else {
         SOC_LOGE(TAG, "invalid frequency");
         abort();
@@ -690,15 +688,15 @@ void rtc_clk_cpu_freq_get_config(rtc_cpu_freq_config_t* out_config)
         case RTC_CNTL_SOC_CLK_SEL_PLL: {
             source = RTC_CPU_FREQ_SRC_PLL;
             uint32_t cpuperiod_sel = DPORT_REG_GET_FIELD(DPORT_CPU_PER_CONF_REG, DPORT_CPUPERIOD_SEL);
-            if (cpuperiod_sel == 0) {
+            if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_80) {
                 source_freq_mhz = RTC_PLL_FREQ_320M;
                 div = 4;
                 freq_mhz = 80;
-            } else if (cpuperiod_sel == 1) {
+            } else if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_160) {
                 source_freq_mhz = RTC_PLL_FREQ_320M;
                 div = 2;
                 freq_mhz = 160;
-            } else if (cpuperiod_sel == 2) {
+            } else if (cpuperiod_sel == DPORT_CPUPERIOD_SEL_240) {
                 source_freq_mhz = RTC_PLL_FREQ_480M;
                 div = 2;
                 freq_mhz = 240;