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This driver is for devices attached to a PCIe root port that support
Runtime D3. It creates the necessary PowerResource in the root port to
provide _ON/_OFF methods for which will turn off power and clocks to the
device when it is in the D3cold state.
The mainboard declares the driver in devicetree and provides the GPIOs
that control power/reset for the device attached to the root port and
the SRCCLK pin used for the PMC IPC mailbox to enable/disable the clock.
An additional device property is created for storage devices if it
matches the PCI storage class which is used to indicate that the storage
device should use D3 for power savings.
BUG=b:160996445
TEST=boot on volteer device with this driver enabled in the devicetree
and disassemble the SSDT to ensure this code exists.
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Change-Id: I13e59c996b4f5e4c2657694bda9fad869b64ffde
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46260
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
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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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