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mb/siemens/mc_ehl1: Adjust PCIe clock settings in devicetree 

On mc_ehl1 there are three of the 6 PCIe clocks used to drive PCIe
devices. None of the used clock output is dedicated to a special device
(CLK0 drives several devices on the mainboard, CLK1 and CLK2 are
connected to a PCIe switch). Therefore do not use a port mapping of the
clocks to avoid a stopping clock once a device is missing and the
matching root port is disabled. Instead set the mapping to
'PCIE_CLK_FREE' to have a free running clock.

In addition, use the defined constant 'PCIE_CLK_NOTUSED' instead of the
value 0xFF to disable the CLKREQ-feature and unused clocks.

Change-Id: I2beea76ff8fefd79f476bef343d13495b45cdfcf
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58740
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Werner Zeh 2021-10-29 07:07:14 +02:00 committed by Patrick Georgi
parent 5cd1871929
commit e4b2d7da4f
1 changed files with 12 additions and 12 deletions
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24
src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb
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@ -53,19 +53,19 @@ chip soc/intel/elkhartlake
register "PcieRpEnable[3]" = "1"
register "PcieRpEnable[6]" = "1"
register "PcieClkSrcUsage[0]" = "0x00"
register "PcieClkSrcUsage[1]" = "0x01"
register "PcieClkSrcUsage[2]" = "0x02"
register "PcieClkSrcUsage[3]" = "0xFF"
register "PcieClkSrcUsage[4]" = "0xFF"
register "PcieClkSrcUsage[5]" = "0xFF"
register "PcieClkSrcUsage[0]" = "PCIE_CLK_FREE"
register "PcieClkSrcUsage[1]" = "PCIE_CLK_FREE"
register "PcieClkSrcUsage[2]" = "PCIE_CLK_FREE"
register "PcieClkSrcUsage[3]" = "PCIE_CLK_NOTUSED"
register "PcieClkSrcUsage[4]" = "PCIE_CLK_NOTUSED"
register "PcieClkSrcUsage[5]" = "PCIE_CLK_NOTUSED"
register "PcieClkSrcClkReq[0]" = "0xFF"
register "PcieClkSrcClkReq[1]" = "0xFF"
register "PcieClkSrcClkReq[2]" = "0xFF"
register "PcieClkSrcClkReq[3]" = "0xFF"
register "PcieClkSrcClkReq[4]" = "0xFF"
register "PcieClkSrcClkReq[5]" = "0xFF"
register "PcieClkSrcClkReq[0]" = "PCIE_CLK_NOTUSED"
register "PcieClkSrcClkReq[1]" = "PCIE_CLK_NOTUSED"
register "PcieClkSrcClkReq[2]" = "PCIE_CLK_NOTUSED"
register "PcieClkSrcClkReq[3]" = "PCIE_CLK_NOTUSED"
register "PcieClkSrcClkReq[4]" = "PCIE_CLK_NOTUSED"
register "PcieClkSrcClkReq[5]" = "PCIE_CLK_NOTUSED"
# Disable all L1 substates for PCIe root ports
register "PcieRpL1Substates[0]" = "L1_SS_DISABLED"