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authorYouness Alaoui <youness.alaoui@puri.sm>2017-05-03 17:57:13 -0400
committerMartin Roth <martinroth@google.com>2017-06-09 16:59:30 +0200
commitbb5fb64e11aa7eb6534a5dd5a06d5ea29dc4d411 (patch)
treec298d9acae216d54ecb283b8380ca03570a0b239 /configs
parent3c0d7d21efd739101658069683b08c5aab320837 (diff)
downloadcoreboot-bb5fb64e11aa7eb6534a5dd5a06d5ea29dc4d411.tar.xz
pciexp_device: Prevent race condition with retrain link
The PCIe specification[1] describes a race condition that can occur when using the Retrain Link bit in the Link Control Register. The race condition is avoided by checking the retrain link bit in the link status register and waiting until it is set to 0, before initiating a new link retraining. [1] PCI Express Base Specification Revision 3.0 Page 633 Change-Id: I9d5840fb9a6e63838b5a4084d3bbe483f1d870ed Signed-off-by: Youness Alaoui <youness.alaoui@puri.sm> Reviewed-on: https://review.coreboot.org/19556 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-by: Martin Roth <martinroth@google.com>
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