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PCI: Add pcie_get_width_cap() to find max supported link width

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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>
This commit is contained in:
Tal Gilboa
2018-03-30 08:24:36 -05:00
committed by Bjorn Helgaas
parent 6cf57be0f7
commit c70b65fb7f
3 changed files with 21 additions and 8 deletions
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10
drivers/pci/pci-sysfs.c
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@@ -167,15 +167,9 @@ static DEVICE_ATTR_RO(max_link_speed);
static ssize_t max_link_width_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
u32 linkcap;
int err;
struct pci_dev *pdev = to_pci_dev(dev);
err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap);
if (err)
return -EINVAL;
return sprintf(buf, "%u\n", (linkcap & PCI_EXP_LNKCAP_MLW) >> 4);
return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
}
static DEVICE_ATTR_RO(max_link_width);