[PATCH v4 10/11] PCI: Add function to convert lnkctl2speed to pci_bus_speed

[Krishna Chaitanya Chundru]

Add a exported function to convert lnkctl2speed to enum pci_bus_speed,
so that other kernel drivers can use it.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx>
---
 drivers/pci/pci.c   | 12 ++++++++++++
 include/linux/pci.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e9448d55113bdfd2263d8e2f6b3ec802f56b712e..8950e88826e27accfe699e31fba8f4077c26296f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6018,6 +6018,18 @@ int pcie_link_speed_mbps(struct pci_dev *pdev)
 }
 EXPORT_SYMBOL(pcie_link_speed_mbps);
 
+/**
+ * pci_lnkctl2_bus_speed - convert lnkctl2 speed to pci_bus_speed
+ * @speed: LNKCAP2 SLS value
+ *
+ * Return: pci_bus_speed
+ */
+enum pci_bus_speed pci_lnkctl2_bus_speed(int speed)
+{
+	return pcie_link_speed[speed];
+}
+EXPORT_SYMBOL(pci_lnkctl2_bus_speed);
+
 /**
  * pcie_bandwidth_available - determine minimum link settings of a PCIe
  *			      device and its bandwidth limitation
diff --git a/include/linux/pci.h b/include/linux/pci.h
index cb703443290a013c8372333fc8d547d190d9f3b4..900f2aad5caf664eb89babca82e1921b1ca2fe5f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1654,6 +1654,7 @@ int pci_cfg_space_size(struct pci_dev *dev);
 unsigned char pci_bus_max_busnr(struct pci_bus *bus);
 resource_size_t pcibios_window_alignment(struct pci_bus *bus,
 					 unsigned long type);
+enum pci_bus_speed pci_lnkctl2_bus_speed(int speed);
 
 #define PCI_VGA_STATE_CHANGE_BRIDGE (1 << 0)
 #define PCI_VGA_STATE_CHANGE_DECODES (1 << 1)

-- 
2.34.1