D3Cold

Configuration space is not accessible in D3Cold. Either there's a WAKE# or beacon to signal the need of main power, or there needs to be other platform-specific ways to power up the function again to D0 (usually through ACPI support.)

References

Links

• [PATCH -v7 4/4] PCIe, PM, Add PCIe runtime D3cold support
• 1.2. Native PCI Power Management
• Firmware requirements for D3cold

Specification

• 5.3.1.4.2 D3cold State