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Current the common soc code automatically selects PCIEXP_CLK_PM and
PCIEXP_L1_SUB_STATE which breaks booting Windows with a PCIE NVIDIA
graphics card attached on mainboards that do not have a CLKREQ# signal.
This is commonly used on server and workstations boards where the
additional power savings of L1 substate are not required.
Make the PCIEXP_CLK_PM and PCIEXP_L1_SUB_STATE default y but do not
select it anymore by the soc code, thus we can disable it in the
mainboard code.
Tested on CFL with Windows 10.
Change-Id: I025e13d6d8183256647e4c034e31bafa235f7eb7
Signed-off-by: Christian Walter <christian.walter@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41696
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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This patch moves required Kconfig selection for enabling ASPM feature
(like clk_pm, L1 state etc) from soc code to intel common pch base code.
TEST=Run lspci -vvv | grep ASPM
The output shows the ASPM L1 is enable for pci devices
Change-Id: Ic77602a75f0c9ccf28ebfd57e53433dc90985a16
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/29653
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
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Add PCIe code support under soc/intel/common/block
to initialize PCIe controller, allocate resources
and configure L1 substate latency.
Change-Id: I0c374317a3fe0be0bb1c5d9b16fcbc5cad83ca42
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/19665
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
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