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PCI: Add pci_speed_string()

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Add pci_speed_string() to return a text description of the supplied bus or
link speed.  The slot code previously used the private
pci_bus_speed_strings[] array for this purpose, but adding this interface
will enable us to consolidate similar code elsewhere.

Export pcie_link_speed[] and pci_speed_string() so they can be used by
modules.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2020-02-28 15:02:03 -06:00
parent 9cb3985af6
commit e56faff57f
4 changed files with 43 additions and 38 deletions
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2
include/linux/pci.h
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@ -236,7 +236,7 @@ enum pcie_link_width {
PCIE_LNK_WIDTH_UNKNOWN = 0xff,
};
/* Based on the PCI Hotplug Spec, but some values are made up by us */
/* See matching string table in pci_speed_string() */
enum pci_bus_speed {
PCI_SPEED_33MHz = 0x00,
PCI_SPEED_66MHz = 0x01,