From 92db94fa518f8892cc967f13a41715c96e4fa9e5 Mon Sep 17 00:00:00 2001 From: Huacai Chen Date: Sat, 15 Sep 2018 14:01:12 +0800 Subject: [PATCH] MIPS/PCI: Call pcie_bus_configure_settings() to set MPS/MRRS [ Upstream commit 2794f688b2c336e0da85e9f91fed33febbd9f54a ] Call pcie_bus_configure_settings() on MIPS, like for other platforms. The function pcie_bus_configure_settings() makes sure the MPS (Max Payload Size) across the bus is uniform and provides the ability to tune the MRSS (Max Read Request Size) and MPS (Max Payload Size) to higher performance values. Some devices will not operate properly if these aren't set correctly because the firmware doesn't always do it. Signed-off-by: Huacai Chen Signed-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/20649/ Cc: Ralf Baechle Cc: James Hogan Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang Cc: Zhangjin Wu Cc: Huacai Chen Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/mips/pci/pci-legacy.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/mips/pci/pci-legacy.c b/arch/mips/pci/pci-legacy.c index f1e92bf743c2..3c3b1e6abb53 100644 --- a/arch/mips/pci/pci-legacy.c +++ b/arch/mips/pci/pci-legacy.c @@ -127,8 +127,12 @@ static void pcibios_scanbus(struct pci_controller *hose) if (pci_has_flag(PCI_PROBE_ONLY)) { pci_bus_claim_resources(bus); } else { + struct pci_bus *child; + pci_bus_size_bridges(bus); pci_bus_assign_resources(bus); + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); } pci_bus_add_devices(bus); } -- GitLab