[0/3] Add API for missing PCI firmware specification funcs

Message

Mario Limonciello Nov. 10, 2023, 6:55 p.m. UTC

The PCI firmware specification includes support for methods for adjusting
AUX power in D3cold as well as the PERST# assertion delay for a PCI
device.

In some hardware designs these methods might be useful for drivers to
call to configure the platform properly for the hardware's expected
behavior.

This series introduces two new symbols as API that drivers can call if
necessary.

In the Microsoft Windows ecosystem, Microsoft offers a similar API wrapping
these functions for device drivers to utilize.

Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_d3cold_aux_power_and_timing_interface
Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/nc-wdm-d3cold_request_aux_power
Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/nc-wdm-d3cold_request_perst_delay

Mario Limonciello (3):
  PCI: Call PCI ACPI _DSM with consistent revision argument
  PCI/ACPI: Add API for specifying aux power in D3cold
  PCI/ACPI: Add API for specifying a PERST# assertion delay

 drivers/acpi/pci_root.c  |   3 +-
 drivers/pci/pci-acpi.c   | 100 ++++++++++++++++++++++++++++++++++++++-
 drivers/pci/pci-label.c  |   4 +-
 drivers/pci/pcie/edr.c   |  13 ++---
 include/linux/pci-acpi.h |  10 ++++
 5 files changed, 119 insertions(+), 11 deletions(-)


base-commit: 89cdf9d556016a54ff6ddd62324aa5ec790c05cc