diff --git a/components/bootloader_support/src/esp32s31/bootloader_esp32s31.c b/components/bootloader_support/src/esp32s31/bootloader_esp32s31.c
index d90ccb52bb5..7e9ccb2eb38 100644
--- a/components/bootloader_support/src/esp32s31/bootloader_esp32s31.c
+++ b/components/bootloader_support/src/esp32s31/bootloader_esp32s31.c
@@ -34,6 +34,8 @@
 #include "esp_rom_sys.h"
 #include "hal/clk_tree_ll.h"
 #include "hal/psram_ctrlr_ll.h"
+#include "soc/regi2c_bias.h"
+#include "hal/regi2c_ctrl.h"
 
 ESP_LOG_ATTR_TAG(TAG, "boot.esp32s31");
 
@@ -61,6 +63,8 @@ static inline void bootloader_hardware_init(void)
     _psram_ctrlr_ll_select_clk_source(PSRAM_CTRLR_LL_MSPI_ID_2, PSRAM_CLK_SRC_XTAL);
     _psram_ctrlr_ll_select_clk_source(PSRAM_CTRLR_LL_MSPI_ID_3, PSRAM_CLK_SRC_XTAL);
     clk_ll_mpll_disable();
+    REGI2C_WRITE_MASK(I2C_BIAS, I2C_BIAS_DREG_1P1, 10);
+    REGI2C_WRITE_MASK(I2C_BIAS, I2C_BIAS_DREG_1P1_PVT, 10);
 }
 
 void bootloader_enable_cpu_reset_info(void)
diff --git a/components/soc/esp32s31/include/soc/regi2c_bias.h b/components/soc/esp32s31/include/soc/regi2c_bias.h
new file mode 100644
index 00000000000..cd6147635ea
--- /dev/null
+++ b/components/soc/esp32s31/include/soc/regi2c_bias.h
@@ -0,0 +1,35 @@
+/*
+ * SPDX-FileCopyrightText: 2023-2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ */
+
+#pragma once
+
+/**
+ * @file regi2c_bias.h
+ * @brief Register definitions for bias
+ *
+ * This file lists register fields of BIAS. These definitions are used via macros defined in regi2c_ctrl.h, by
+ * rtc_clk_init function in esp32s31/rtc_clk_init.c.
+ */
+
+#define I2C_BIAS        0x6A
+#define I2C_BIAS_HOSTID 0
+
+#define I2C_BIAS_DREG_1P6       0
+#define I2C_BIAS_DREG_1P6_MSB   3
+#define I2C_BIAS_DREG_1P6_LSB   0
+
+#define I2C_BIAS_DREG_1P1       0
+#define I2C_BIAS_DREG_1P1_MSB   7
+#define I2C_BIAS_DREG_1P1_LSB   4
+
+#define I2C_BIAS_DREG_1P1_PVT       1
+#define I2C_BIAS_DREG_1P1_PVT_MSB   3
+#define I2C_BIAS_DREG_1P1_PVT_LSB   0
+
+#define I2C_BIAS_DREG_2P2_PVT       1
+#define I2C_BIAS_DREG_2P2_PVT_MSB   7
+#define I2C_BIAS_DREG_2P2_PVT_LSB   4
+