target/linux/cns3xxx/patches-4.14/130-Extend-PCIE_BUS_PEER2PEER-to-set-MRSS-128-to-fix-CNS3xxx-BM-DMA..patch

   1 --- a/drivers/pci/probe.c
   2 +++ b/drivers/pci/probe.c
   3 @@ -2309,7 +2309,8 @@ static void pcie_write_mrrs(struct pci_d
   4         /* In the "safe" case, do not configure the MRRS.  There appear to be
   5          * issues with setting MRRS to 0 on a number of devices.
   6          */
   7 -       if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
   8 +       if (pcie_bus_config != PCIE_BUS_PERFORMANCE &&
   9 +           pcie_bus_config != PCIE_BUS_PEER2PEER)
  10                 return;
  11
  12         /* For Max performance, the MRRS must be set to the largest supported
  13 --- a/include/linux/pci.h
  14 +++ b/include/linux/pci.h
  15 @@ -847,7 +847,7 @@ enum pcie_bus_config_types {
  16         PCIE_BUS_DEFAULT,       /* ensure MPS matches upstream bridge */
  17         PCIE_BUS_SAFE,          /* use largest MPS boot-time devices support */
  18         PCIE_BUS_PERFORMANCE,   /* use MPS and MRRS for best performance */
  19 -       PCIE_BUS_PEER2PEER,     /* set MPS = 128 for all devices */
  20 +       PCIE_BUS_PEER2PEER,     /* set MPS and MRSS to 128 for all devices */
  21  };
  22
  23  extern enum pcie_bus_config_types pcie_bus_config;