diff options
| author | Tal Gilboa <talgi@mellanox.com> | 2018-03-30 08:24:36 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-03-30 15:33:38 -0500 |
| commit | c70b65fb7f121da7d01f62588ce6abb4741f513f (patch) | |
| tree | 383cdda6cad94b1ef9b3f116382221c3a379089e /drivers/pci/pci.c | |
| parent | 6cf57be0f78e289aaf236f8bc55c40ea6c422c75 (diff) | |
| download | linux-c70b65fb7f121da7d01f62588ce6abb4741f513f.tar.bz2 | |
PCI: Add pcie_get_width_cap() to find max supported link width
Add pcie_get_width_cap() to find the max link width supported by a device.
Change max_link_width_show() to use pcie_get_width_cap().
Signed-off-by: Tal Gilboa <talgi@mellanox.com>
[bhelgaas: return width directly instead of error and *width, don't export
outside drivers/pci]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b29d3436ee9f..43075be79388 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5191,6 +5191,24 @@ enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev) } /** + * pcie_get_width_cap - query for the PCI device's link width capability + * @dev: PCI device to query + * + * Query the PCI device width capability. Return the maximum link width + * supported by the device. + */ +enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev) +{ + u32 lnkcap; + + pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap); + if (lnkcap) + return (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4; + + return PCIE_LNK_WIDTH_UNKNOWN; +} + +/** * 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 |