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| author | Tal Gilboa <talgi@mellanox.com> | 2018-03-30 07:44:05 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-03-30 15:33:38 -0500 |
| commit | 6cf57be0f78e289aaf236f8bc55c40ea6c422c75 (patch) | |
| tree | 6a139948424dfd0d349b2baf06bdcd4370285427 /drivers/pci/pci-sysfs.c | |
| parent | 1acfb9b7ee0b1881bb8e875b6757976e48293ec4 (diff) | |
| download | lwn-6cf57be0f78e289aaf236f8bc55c40ea6c422c75.tar.gz lwn-6cf57be0f78e289aaf236f8bc55c40ea6c422c75.zip | |
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: Tal Gilboa <talgi@mellanox.com>
[bhelgaas: return speed directly instead of error and *speed, 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-sysfs.c')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 28 |
1 files changed, 2 insertions, 26 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 7dc5be545d18..c2ea05fbbf1d 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -158,33 +158,9 @@ static DEVICE_ATTR_RO(resource); static ssize_t max_link_speed_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct pci_dev *pci_dev = to_pci_dev(dev); - u32 linkcap; - int err; - const char *speed; - - err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap); - if (err) - return -EINVAL; - - switch (linkcap & PCI_EXP_LNKCAP_SLS) { - case PCI_EXP_LNKCAP_SLS_16_0GB: - speed = "16 GT/s"; - break; - case PCI_EXP_LNKCAP_SLS_8_0GB: - speed = "8 GT/s"; - break; - case PCI_EXP_LNKCAP_SLS_5_0GB: - speed = "5 GT/s"; - break; - case PCI_EXP_LNKCAP_SLS_2_5GB: - speed = "2.5 GT/s"; - break; - default: - speed = "Unknown speed"; - } + struct pci_dev *pdev = to_pci_dev(dev); - return sprintf(buf, "%s\n", speed); + return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev))); } static DEVICE_ATTR_RO(max_link_speed); |