diff --git a/src/device/pnp_device.c b/src/device/pnp_device.c
index 259d449752..699007d9ba 100644
--- a/src/device/pnp_device.c
+++ b/src/device/pnp_device.c
@@ -47,6 +47,15 @@ u8 pnp_read_config(struct device *dev, u8 reg)
 	return inb(dev->path.pnp.port + 1);
 }
 
+void pnp_unset_and_set_config(struct device *dev, u8 reg, u8 unset, u8 set)
+{
+	outb(reg, dev->path.pnp.port);
+	u8 value = inb(dev->path.pnp.port + 1);
+	value &= ~unset;
+	value |= set;
+	outb(value, dev->path.pnp.port + 1);
+}
+
 void pnp_set_logical_device(struct device *dev)
 {
 	pnp_write_config(dev, 0x07, dev->path.pnp.device & 0xff);
diff --git a/src/include/device/pnp.h b/src/include/device/pnp.h
index 955eac29ac..770a640963 100644
--- a/src/include/device/pnp.h
+++ b/src/include/device/pnp.h
@@ -13,6 +13,7 @@
 /* Primitive PNP resource manipulation */
 void pnp_write_config(struct device *dev, u8 reg, u8 value);
 u8 pnp_read_config(struct device *dev, u8 reg);
+void pnp_unset_and_set_config(struct device *dev, u8 reg, u8 unset, u8 set);
 void pnp_set_logical_device(struct device *dev);
 void pnp_set_enable(struct device *dev, int enable);
 int pnp_read_enable(struct device *dev);