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--- a/drivers/pci/probe.c
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+++ b/drivers/pci/probe.c
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@@ -1938,7 +1938,8 @@ static void pcie_write_mrrs(struct pci_d
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/* In the "safe" case, do not configure the MRRS. There appear to be
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* issues with setting MRRS to 0 on a number of devices.
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*/
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- if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
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+ if (pcie_bus_config != PCIE_BUS_PERFORMANCE &&
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+ pcie_bus_config != PCIE_BUS_PEER2PEER)
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return;
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/* For Max performance, the MRRS must be set to the largest supported
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--- a/include/linux/pci.h
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+++ b/include/linux/pci.h
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@@ -757,7 +757,7 @@ enum pcie_bus_config_types {
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PCIE_BUS_DEFAULT, /* ensure MPS matches upstream bridge */
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PCIE_BUS_SAFE, /* use largest MPS boot-time devices support */
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PCIE_BUS_PERFORMANCE, /* use MPS and MRRS for best performance */
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- PCIE_BUS_PEER2PEER, /* set MPS = 128 for all devices */
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+ PCIE_BUS_PEER2PEER, /* set MPS and MRSS to 128 for all devices */
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};
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extern enum pcie_bus_config_types pcie_bus_config;
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