PCI: Wait for up to 1000ms after FLR reset

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Some devices take longer than the spec indicates to return from FLR reset,
a notable case of this is Intel integrated graphics (IGD), which can often
take an additional 300ms powering down an attached LCD panel as part of the
FLR.  Allow devices up to 1000ms, testing every 100ms whether the second
dword of config space is read as -1.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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Alex Williamson 2016-02-22 13:05:48 -07:00 • committed by Bjorn Helgaas

parent 0a3d00b33b

commit 5adecf817d

1 changed files with 25 additions and 2 deletions

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drivers/pci/pci.c

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