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Calculate and save the timing parameters that need to be programmed if we need to enable L1.2 substates later. We use the same logic (and a constant value for 1 of the parameters) as used by Intel's coreboot: https://www.coreboot.org/pipermail/coreboot-gerrit/2015-March/021134.html https://review.coreboot.org/#/c/8832/ Signed-off-by: Rajat Jain <rajatja@google.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>