PCI: Add pcie_get_speed_cap() to find max supported link speed
Add pcie_get_speed_cap() to find the max link speed supported by a device. Change max_link_speed_show() to use pcie_get_speed_cap(). Signed-off-by: NTal Gilboa <talgi@mellanox.com> [bhelgaas: return speed directly instead of error and *speed, don't export outside drivers/pci] Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Reviewed-by: NTariq Toukan <tariqt@mellanox.com>
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