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mb/google/hatch: Enable LTR for PCIe ports 

Enable LTR for NVMe and WiFi PCIe ports so that they can use ASPM L1.2

BUG=b:134195632
TEST=Verified L1 substate with lspci on hatch:
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: I7fce60897b78dde12747ac7fb857c988d16118ab
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33161
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Furquan Shaikh 2019-06-01 14:44:56 -07:00 committed by Patrick Georgi
parent a99ed13e33
commit fca7c4d614
1 changed files with 2 additions and 0 deletions
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2
src/mainboard/google/hatch/variants/baseboard/devicetree.cb
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@ -72,6 +72,7 @@ chip soc/intel/cannonlake
# Enable Root port 9(x4) for NVMe.
register "PcieRpEnable[8]" = "1"
register "PcieRpLtrEnable[8]" = "1"
# RP 9 uses CLK SRC 1
register "PcieClkSrcUsage[1]" = "8"
# ClkReq-to-ClkSrc mapping for CLK SRC 1
@ -79,6 +80,7 @@ chip soc/intel/cannonlake
# PCIe port 14 for M.2 E-key WLAN
register "PcieRpEnable[13]" = "1"
register "PcieRpLtrEnable[13]" = "1"
# RP 14 uses CLK SRC 3
register "PcieClkSrcUsage[3]" = "13"
register "PcieClkSrcClkReq[3]" = "3"