On Fri, Mar 10, 2017 at 02:47:04PM -0600, Bjorn Helgaas wrote:
> On Fri, Mar 10, 2017 at 2:23 PM, Lukas Wunner wrote:
> > +/**
> > + * pci_is_thunderbolt_attached - whether device is on a Thunderbolt daisy
> > chain
> > + * @pdev: PCI device to check
> > + *
> > + * Walk upwards from @pdev and ch
On Fri, Mar 10, 2017 at 2:23 PM, Lukas Wunner wrote:
> +/**
> + * pci_is_thunderbolt_attached - whether device is on a Thunderbolt daisy
> chain
> + * @pdev: PCI device to check
> + *
> + * Walk upwards from @pdev and check for each encountered bridge if it's part
> + * of a Thunderbolt controll
Detect on probe whether a PCI device is part of a Thunderbolt controller.
Intel uses a Vendor-Specific Extended Capability (VSEC) with ID 0x1234
on such devices. Detect presence of this VSEC and cache it in a newly
added is_thunderbolt bit in struct pci_dev.
Also, add a helper to check whether a
