[v17,0/4] Allow drivers to influence D3 behavior for bridges

Message

Mario Limonciello Sept. 6, 2023, 6:43 p.m. UTC

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(-)