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(parent: 87b336d) | patch
PCI/DPC: Wait for Root Port busy to clear
authorKeith Busch <keith.busch@intel.com>
Fri, 3 Feb 2017 21:46:13 +0000 (16:46 -0500)
committerBjorn Helgaas <bhelgaas@google.com>
Fri, 10 Feb 2017 20:36:14 +0000 (14:36 -0600)
commitabdbf4d635a9a8c956bb9757a9d4f08c2abe1f97
tree505f28df23e7cf1413c3537f258f722f2627492dtree | snapshot
parent87b336d003d47876e376d943be3c9d35152f3b86commit | diff
PCI/DPC: Wait for Root Port busy to clear

Per PCIe r3.1, sec 6.2.10 and sec 7.13.4, on Root Ports that support "RP
Extensions for DPC",

  When the DPC Trigger Status bit is Set and the DPC RP Busy bit is Set,
  software must leave the Root Port in DPC until the DPC RP Busy bit reads
  0b.

Wait up to 1 second for the Root Port to become non-busy.

[bhelgaas: changelog, spec references]
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
drivers/pci/pcie/pcie-dpc.c diff | blob | history
include/uapi/linux/pci_regs.h diff | blob | history
John Crispins staging tree