Add support for FSP ASPM and Clock PM configuration based on Kconfig
options: PCIEXP_ASPM, PCIEXP_CLK_PM and PCIEXP_L1_SUB_STATE. For some
use cases it may be desirable to disable ASPM and Clock PM to achieve
more deterministic and higher performance of PCIe devices.
TEST=Boot MSI PRO Z690-A DDR4 without ASPM and Clock PM. Confirm all
PCIe devices are still working and ASPM and Clock PM capabilities
are not present on the PCIe Root Ports.
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Change-Id: I6d9d11016bed89dcfee6909d0d3e3e2e56237a2f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69825
Reviewed-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
97112481f5