tree 6bebe9ffb0b9ca46862121b9030c2934194e8c3a
parent 0f1103e40f9186bd2cdac4dde6c5bbd2f5273365
author Xudong Hao <xudong.hao@intel.com> 1335539806 -0600
committer Bjorn Helgaas <bhelgaas@google.com> 1335974552 -0600

PCI: work around IvyBridge internal graphics FLR erratum

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>