PCI: Add pci_bus_crs_vendor_id() to detect CRS response data

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Add pci_bus_crs_vendor_id() to determine whether data returned for a config
read of the Vendor ID indicates a Configuration Request Retry Status (CRS)
response.

Per PCIe r3.1, sec 2.3.2, this data is only returned if:

  - CRS Software Visibility is enabled,
  - a config read includes both bytes of the Vendor ID, and
  - the read receives a CRS completion

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
[bhelgaas: changelog, change name to pci_bus_crs_vendor_id(), make static
in probe.c, use it in pci_bus_read_dev_vendor_id()]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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Sinan Kaya 2017-08-29 14:45:44 -05:00 • committed by Bjorn Helgaas

parent 9f98275671

commit 62bc6a6f74

1 changed files with 6 additions and 1 deletions

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7

drivers/pci/probe.c

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