diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e37fea6..c71e78c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3579,6 +3579,49 @@
 }
 
 /**
+ * pcie_get_minimum_link - determine minimum link settings of a PCI device
+ * @dev: PCI device to query
+ * @speed: storage for minimum speed
+ * @width: storage for minimum width
+ *
+ * This function will walk up the PCI device chain and determine the minimum
+ * link width and speed of the device.
+ */
+int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed,
+			  enum pcie_link_width *width)
+{
+	int ret;
+
+	*speed = PCI_SPEED_UNKNOWN;
+	*width = PCIE_LNK_WIDTH_UNKNOWN;
+
+	while (dev) {
+		u16 lnksta;
+		enum pci_bus_speed next_speed;
+		enum pcie_link_width next_width;
+
+		ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta);
+		if (ret)
+			return ret;
+
+		next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS];
+		next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >>
+			PCI_EXP_LNKSTA_NLW_SHIFT;
+
+		if (next_speed < *speed)
+			*speed = next_speed;
+
+		if (next_width < *width)
+			*width = next_width;
+
+		dev = dev->bus->self;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(pcie_get_minimum_link);
+
+/**
  * pci_select_bars - Make BAR mask from the type of resource
  * @dev: the PCI device for which BAR mask is made
  * @flags: resource type mask to be selected