diff --git a/quantum/split_common/split_util.c b/quantum/split_common/split_util.c
index 2ae44e6e15f4..9e75e19ce0ea 100644
--- a/quantum/split_common/split_util.c
+++ b/quantum/split_common/split_util.c
@@ -1,3 +1,18 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 #include "split_util.h"
 #include "matrix.h"
 #include "keyboard.h"
@@ -6,14 +21,7 @@
 #include "transport.h"
 #include "quantum.h"
 #include "wait.h"
-
-#ifdef PROTOCOL_LUFA
-#    include <LUFA/Drivers/USB/USB.h>
-#endif
-
-#ifdef PROTOCOL_VUSB
-#    include <usbdrv/usbdrv.h>
-#endif
+#include "usb_util.h"
 
 #ifdef EE_HANDS
 #    include "eeconfig.h"
@@ -31,56 +39,21 @@
 #    define SPLIT_USB_TIMEOUT_POLL 10
 #endif
 
-#ifdef PROTOCOL_CHIBIOS
-#    define SPLIT_USB_DETECT  // Force this on for now
-#endif
-
 volatile bool isLeftHand = true;
 
 #if defined(SPLIT_USB_DETECT)
-#    if defined(PROTOCOL_LUFA)
-static inline bool usbHasActiveConnection(void) { return USB_Device_IsAddressSet(); }
-static inline void usbDisable(void) {
-    USB_Disable();
-    USB_DeviceState = DEVICE_STATE_Unattached;
-}
-#    elif defined(PROTOCOL_CHIBIOS)
-static inline bool usbHasActiveConnection(void) { return usbGetDriverStateI(&USBD1) == USB_ACTIVE; }
-static inline void usbDisable(void) { usbStop(&USBD1); }
-#    elif defined(PROTOCOL_VUSB)
-static inline bool usbHasActiveConnection(void) {
-    usbPoll();
-    return usbConfiguration;
-}
-static inline void usbDisable(void) { usbDeviceDisconnect(); }
-#    else
-static inline bool usbHasActiveConnection(void) { return true; }
-static inline void usbDisable(void) {}
-#    endif
-
-bool usbIsActive(void) {
+static bool usbIsActive(void) {
     for (uint8_t i = 0; i < (SPLIT_USB_TIMEOUT / SPLIT_USB_TIMEOUT_POLL); i++) {
         // This will return true if a USB connection has been established
-        if (usbHasActiveConnection()) {
+        if (usb_connected_state()) {
             return true;
         }
         wait_ms(SPLIT_USB_TIMEOUT_POLL);
     }
-
-    // Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
-    usbDisable();
-
     return false;
 }
-#elif defined(PROTOCOL_LUFA) && defined(OTGPADE)
-static inline bool usbIsActive(void) {
-    USB_OTGPAD_On();  // enables VBUS pad
-    wait_us(5);
-
-    return USB_VBUS_GetStatus();  // checks state of VBUS
-}
 #else
-static inline bool usbIsActive(void) { return true; }
+static inline bool usbIsActive(void) { return usb_vbus_state(); }
 #endif
 
 #ifdef SPLIT_HAND_MATRIX_GRID
@@ -126,6 +99,11 @@ __attribute__((weak)) bool is_keyboard_master(void) {
     // only check once, as this is called often
     if (usbstate == UNKNOWN) {
         usbstate = usbIsActive() ? MASTER : SLAVE;
+
+        // Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
+        if (usbstate == SLAVE) {
+            usb_disable();
+        }
     }
 
     return (usbstate == MASTER);
diff --git a/tmk_core/common.mk b/tmk_core/common.mk
index 238b3c69fd56..ca04ea7767e7 100644
--- a/tmk_core/common.mk
+++ b/tmk_core/common.mk
@@ -12,6 +12,7 @@ TMK_COMMON_SRC +=	$(COMMON_DIR)/host.c \
 	$(COMMON_DIR)/sendchar_null.c \
 	$(COMMON_DIR)/eeconfig.c \
 	$(COMMON_DIR)/report.c \
+	$(COMMON_DIR)/usb_util.c \
 	$(PLATFORM_COMMON_DIR)/suspend.c \
 	$(PLATFORM_COMMON_DIR)/timer.c \
 	$(COMMON_DIR)/sync_timer.c \
diff --git a/tmk_core/common/chibios/chibios_config.h b/tmk_core/common/chibios/chibios_config.h
index b4d96465d16c..bebf026de7ba 100644
--- a/tmk_core/common/chibios/chibios_config.h
+++ b/tmk_core/common/chibios/chibios_config.h
@@ -15,6 +15,8 @@
  */
 #pragma once
 
+#define SPLIT_USB_DETECT  // Force this on for now
+
 #if defined(STM32F1XX)
 #    define USE_GPIOV1
 #endif
diff --git a/tmk_core/common/usb_util.c b/tmk_core/common/usb_util.c
new file mode 100644
index 000000000000..e4c50fcb10a7
--- /dev/null
+++ b/tmk_core/common/usb_util.c
@@ -0,0 +1,29 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "usb_util.h"
+#include "wait.h"
+
+__attribute__((weak)) void usb_disable(void) {}
+__attribute__((weak)) bool usb_connected_state(void) { return true; }
+__attribute__((weak)) bool usb_vbus_state(void) {
+#ifdef USB_VBUS_PIN
+    setPinInput(USB_VBUS_PIN);
+    wait_us(5);
+    return readPin(USB_VBUS_PIN);
+#else
+    return true;
+#endif
+}
diff --git a/tmk_core/common/usb_util.h b/tmk_core/common/usb_util.h
new file mode 100644
index 000000000000..4ebedb1e71f8
--- /dev/null
+++ b/tmk_core/common/usb_util.h
@@ -0,0 +1,22 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <stdbool.h>
+
+void usb_disable(void);
+bool usb_connected_state(void);
+bool usb_vbus_state(void);
diff --git a/tmk_core/protocol/chibios.mk b/tmk_core/protocol/chibios.mk
index 80554abb3254..d01697835b0d 100644
--- a/tmk_core/protocol/chibios.mk
+++ b/tmk_core/protocol/chibios.mk
@@ -6,6 +6,7 @@ SRC += $(CHIBIOS_DIR)/usb_main.c
 SRC += $(CHIBIOS_DIR)/main.c
 SRC += usb_descriptor.c
 SRC += $(CHIBIOS_DIR)/usb_driver.c
+SRC += $(CHIBIOS_DIR)/usb_util.c
 SRC += $(LIBSRC)
 
 VPATH += $(TMK_PATH)/$(PROTOCOL_DIR)
diff --git a/tmk_core/protocol/chibios/usb_util.c b/tmk_core/protocol/chibios/usb_util.c
new file mode 100644
index 000000000000..5945e8a8de6f
--- /dev/null
+++ b/tmk_core/protocol/chibios/usb_util.c
@@ -0,0 +1,21 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <hal.h>
+#include "usb_util.h"
+
+void usb_disable(void) { usbStop(&USBD1); }
+
+bool usb_connected_state(void) { return usbGetDriverStateI(&USBD1) == USB_ACTIVE; }
diff --git a/tmk_core/protocol/lufa.mk b/tmk_core/protocol/lufa.mk
index 1cc1fa04e5fb..9d9fb728b1b5 100644
--- a/tmk_core/protocol/lufa.mk
+++ b/tmk_core/protocol/lufa.mk
@@ -44,6 +44,7 @@ ifeq ($(strip $(VIRTSER_ENABLE)), yes)
 endif
 
 SRC += $(LUFA_SRC)
+SRC += $(LUFA_DIR)/usb_util.c
 
 # Search Path
 VPATH += $(TMK_PATH)/$(LUFA_DIR)
diff --git a/tmk_core/protocol/lufa/usb_util.c b/tmk_core/protocol/lufa/usb_util.c
new file mode 100644
index 000000000000..9e943a21b97c
--- /dev/null
+++ b/tmk_core/protocol/lufa/usb_util.c
@@ -0,0 +1,34 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <LUFA/Drivers/USB/USB.h>
+#include "usb_util.h"
+#include "wait.h"
+
+void usb_disable(void) {
+    USB_Disable();
+    USB_DeviceState = DEVICE_STATE_Unattached;
+}
+
+bool usb_connected_state(void) { return USB_Device_IsAddressSet(); }
+
+#if defined(OTGPADE)
+bool usb_vbus_state(void) {
+    USB_OTGPAD_On();  // enables VBUS pad
+    wait_us(5);
+
+    return USB_VBUS_GetStatus();  // checks state of VBUS
+}
+#endif
diff --git a/tmk_core/protocol/vusb.mk b/tmk_core/protocol/vusb.mk
index 1de60030899e..e4d013b38dfa 100644
--- a/tmk_core/protocol/vusb.mk
+++ b/tmk_core/protocol/vusb.mk
@@ -5,6 +5,7 @@ VUSB_PATH = $(LIB_PATH)/vusb
 
 SRC += $(VUSB_DIR)/main.c \
 	$(VUSB_DIR)/vusb.c \
+	$(VUSB_DIR)/usb_util.c \
 	$(VUSB_PATH)/usbdrv/usbdrv.c \
 	$(VUSB_PATH)/usbdrv/usbdrvasm.S \
 	$(VUSB_PATH)/usbdrv/oddebug.c
diff --git a/tmk_core/protocol/vusb/usb_util.c b/tmk_core/protocol/vusb/usb_util.c
new file mode 100644
index 000000000000..602854dbe6f3
--- /dev/null
+++ b/tmk_core/protocol/vusb/usb_util.c
@@ -0,0 +1,24 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <usbdrv/usbdrv.h>
+#include "usb_util.h"
+
+void usb_disable(void) { usbDeviceDisconnect(); }
+
+bool usb_connected_state(void) {
+    usbPoll();
+    return usbConfiguration;
+}