2 files changed, 13 insertions, 0 deletions
diff --git a/src/superio/winbond/w83627thg/early_serial.c b/src/superio/winbond/w83627thg/early_serial.c
index 559e9827fc..b80e514097 100644
--- a/src/superio/winbond/w83627thg/early_serial.c
+++ b/src/superio/winbond/w83627thg/early_serial.c
@@ -45,3 +45,14 @@ static void inline w83627thg_enable_serial(device_t dev, u16 iobase)
 	pnp_set_enable(dev, 1);
 	pnp_exit_ext_func_mode(dev);
 }
+
+#ifndef __ROMCC__
+void w83627thg_set_clksel_48(device_t dev) {
+	u8 reg8;
+	pnp_enter_ext_func_mode(dev);
+	reg8 = pnp_read_config(dev, 0x24);
+	reg8 |= (1 << 6); /* Set CLKSEL (clock input on pin 1) to 48MHz. */
+	pnp_write_config(dev, 0x24, reg8);
+	pnp_exit_ext_func_mode(dev);
+}
+#endif
diff --git a/src/superio/winbond/w83627thg/w83627thg.h b/src/superio/winbond/w83627thg/w83627thg.h
index 73be544889..99ff565593 100644
--- a/src/superio/winbond/w83627thg/w83627thg.h
+++ b/src/superio/winbond/w83627thg/w83627thg.h
@@ -34,4 +34,6 @@
 #define W83627THG_ACPI            10
 #define W83627THG_HWM             11   /* Hardware monitor */
 
+void w83627thg_set_clksel_48(device_t dev);
+
 #endif