PCI: work around IvyBridge internal graphics FLR erratum

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For IvyBridge Mobile platform, a system hang may occur if a FLR (Function
Level Reset) is asserted to internal graphics.

This quirk is a workaround for the IVB FLR errata issue.  We are
disabling the FLR reset handshake between the PCH and CPU display, then
manually powering down the panel power sequencing and resetting the PCH
display.

Signed-off-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Kay, Allen M <allen.m.kay@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

...

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Xudong Hao 2012-04-27 09:16:46 -06:00 • committed by Bjorn Helgaas

parent 0f1103e40f

commit df558de16c

1 changed files with 58 additions and 0 deletions

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drivers/pci/quirks.c

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