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| author | Sinan Kaya <okaya@codeaurora.org> | 2017-07-12 00:04:14 -0400 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-07-31 14:31:22 -0500 |
| commit | 62ce94a7a5a54aac80975f5e6731707225d4077e (patch) | |
| tree | af6e5d8fb778bb2fe51a14dcde3b0355b1035bf5 /Documentation | |
| parent | 16f73eb02d7e1765ccab3d2018e0bd98eb93d973 (diff) | |
PCI: Mark Broadcom HT2100 Root Port Extended Tags as broken
Per PCIe r3.1, sec 2.2.6.2 and 7.8.4, a Requester may not use 8-bit Tags
unless its Extended Tag Field Enable is set, but all Receivers/Completers
must handle 8-bit Tags correctly regardless of their Extended Tag Field
Enable.
Some devices do not handle 8-bit Tags as Completers, so add a quirk for
them. If we find such a device, we disable Extended Tags for the entire
hierarchy to make peer-to-peer DMA possible.
The Broadcom HT2100 seems to have issues with handling 8-bit tags. Mark it
as broken.
The pci_walk_bus() in the quirk handles devices we've enumerated in the
past, and pci_configure_device() handles devices we enumerate in the
future.
Fixes: 60db3a4d8cc9 ("PCI: Enable PCIe Extended Tags if supported")
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1467674
Reported-and-tested-by: Wim ten Have <wim.ten.have@oracle.com>
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
[bhelgaas: changelog, tweak messages, rename bit and quirk]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions