D3 on PCIe root ports isn't used on Windows systems in Modern Standby.
Windows uses a uPEP driver that helps to decide the policy for given
ports.
This series adjusts the PCI core to allow drivers to register influencing
the policy and the amd-pmc driver will register.
LPS0 constraints are the basis for it; which if they are added for
Windows would also apply for Linux as well.
Mario Limonciello (4):
ACPI: x86: s2idle: Export symbol for fetching constraints for module
use
PCI: Add support for drivers to register optin or veto of D3
PCI: Check for changes in pci_bridge_d3_possible() when updating D3
platform/x86/amd: pmc: Report device constraints
drivers/acpi/x86/s2idle.c | 1 +
drivers/pci/pci.c | 172 +++++++++++++++++++++++++++--
drivers/platform/x86/amd/pmc/pmc.c | 57 ++++++++++
include/linux/pci.h | 9 ++
4 files changed, 229 insertions(+), 10 deletions(-)
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2.34.1
