mb/supermicro/x11ssm-f: enable LTR for all root ports
Follow vendor and enable LTR on all root ports to optimize for devices'
latency requirements and also optimize power management while preventing
failure due to wrongly guessing idle states, which happens without LTR.
Tested successfully. No errors show up in dmesg.
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Change-Id: I8f72087c71e291d2412dc7b3e16ee7f419e2ca0c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48367
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/supermicro/x11-lga1151-series/variants/x11ssm-f/overridetree.cb b/src/mainboard/supermicro/x11-lga1151-series/variants/x11ssm-f/overridetree.cb
index d7f1873..a03ecc5 100644
--- a/src/mainboard/supermicro/x11-lga1151-series/variants/x11ssm-f/overridetree.cb
+++ b/src/mainboard/supermicro/x11-lga1151-series/variants/x11ssm-f/overridetree.cb
@@ -52,22 +52,27 @@
end
device pci 1c.0 on # PCH PCIe Port 1 / PCIe Slot 4 (JPCIE4)
register "PcieRpEnable[0]" = "1"
+ register "PcieRpLtrEnable[0]" = "1"
smbios_slot_desc "SlotTypePciExpressGen3X8" "SlotLengthShort" "PCH SLOT4 PCI-E 3.0 X4(IN X8)" "SlotDataBusWidth4X"
end
device pci 1c.4 on # PCH PCIe Port 5 / PCIe Slot 5 (JPCIE5)
register "PcieRpEnable[4]" = "1"
+ register "PcieRpLtrEnable[4]" = "1"
smbios_slot_desc "SlotTypePciExpressGen3X8" "SlotLengthShort" "PCH SLOT5 PCI-E 3.0 X4(IN X8)" "SlotDataBusWidth4X"
end
device pci 1d.0 on # PCH PCIe Port 9
register "PcieRpEnable[8]" = "1"
+ register "PcieRpLtrEnable[8]" = "1"
device pci 00.0 on end # GbE 1
end
device pci 1d.1 on # PCH PCIe Port 10
register "PcieRpEnable[9]" = "1"
+ register "PcieRpLtrEnable[9]" = "1"
device pci 00.1 on end # GbE 2
end
device pci 1d.2 on # PCH PCIe Port 11
register "PcieRpEnable[10]" = "1"
+ register "PcieRpLtrEnable[10]" = "1"
device pci 00.0 on # Aspeed PCI Bridge
device pci 00.0 on end # Aspeed 2400 VGA
end