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Explore the challenges and limitations of the Linux PCI Power Control (Pwrctrl) framework in this 14-minute conference talk from the Linux Plumbers Conference. Examine how PCI host bridge drivers traditionally managed endpoint power supplies on non-ACPI systems using DeviceTree, and understand why this approach worked for simple cases but failed for complex endpoint devices like integrated WLAN/BT modules. Learn about the creation of the PCI Pwrctrl framework as a solution to move power supply handling away from host bridge drivers, and discover its current shortcomings including lack of PERST# signal handling, inability to manage multiple endpoints with different power requirements under a single Root Port, and other limitations that prevent its universal adoption across platforms. Gain insights into proposed solutions for addressing these framework deficiencies and making PCI power management more robust and versatile for diverse hardware configurations.
