PCI: Program MPS for RCiEP devices
BugLink: https://bugs.launchpad.net/bugs/1884564 commit aa0ce96d upstream. Root Complex Integrated Endpoints (RCiEPs) do not have an upstream bridge, so pci_configure_mps() previously ignored them, which may result in reduced performance. Instead, program the Max_Payload_Size of RCiEPs to the maximum supported value (unless it is limited for the PCIE_BUS_PEER2PEER case). This also affects the subsequent programming of Max_Read_Request_Size because Linux programs MRRS based on the MPS value. Fixes: 9dae3a97 ("PCI: Move MPS configuration check to pci_configure_device()") Link: https://lore.kernel.org/r/1585343775-4019-1-git-send-email-ashok.raj@intel.comTested-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
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