Duncan Laurie has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/32456
Change subject: mb/google/sarien: Enable LTR for PCIe NVMe root port ......................................................................
mb/google/sarien: Enable LTR for PCIe NVMe root port
Enable LTR for NVMe so it can use ASPM L1.2.
BUG=b:127593309 TEST=build and boot on sarien and check L1 substate with lspci before: L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2- ASPM_L1.1+ after: L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+
Change-Id: I9842beda6767f758556747f83cfcedbd00612698 Signed-off-by: Duncan Laurie dlaurie@google.com --- M src/mainboard/google/sarien/variants/arcada/devicetree.cb M src/mainboard/google/sarien/variants/sarien/devicetree.cb 2 files changed, 2 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/56/32456/1
diff --git a/src/mainboard/google/sarien/variants/arcada/devicetree.cb b/src/mainboard/google/sarien/variants/arcada/devicetree.cb index 426bdae..77bd82a 100644 --- a/src/mainboard/google/sarien/variants/arcada/devicetree.cb +++ b/src/mainboard/google/sarien/variants/arcada/devicetree.cb @@ -196,6 +196,7 @@
# PCIe port 13 for M.2 2280 SSD register "PcieRpEnable[12]" = "1" + register "PcieRpLtrEnable[12]" = "1" register "PcieClkSrcUsage[4]" = "12" register "PcieClkSrcClkReq[4]" = "4"
diff --git a/src/mainboard/google/sarien/variants/sarien/devicetree.cb b/src/mainboard/google/sarien/variants/sarien/devicetree.cb index 27c0913..96146ba 100644 --- a/src/mainboard/google/sarien/variants/sarien/devicetree.cb +++ b/src/mainboard/google/sarien/variants/sarien/devicetree.cb @@ -197,6 +197,7 @@
# PCIe port 13 for M.2 2280 SSD register "PcieRpEnable[12]" = "1" + register "PcieRpLtrEnable[12]" = "1" register "PcieClkSrcUsage[2]" = "12" register "PcieClkSrcClkReq[2]" = "2"