June 26-30, 2023
Prague, Czech Republic + Virtual
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Monday, June 26 • 12:00 - 12:40
(Virtual) AP Power Sequence Subsystem - Bernardo Salvador Perez Priego, Intel Corporation

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This talk introduces a subsystem API in Zephyr to manage the ACPI power sleep states of a connected application processor (AP). Users of this API will be able to query and receive notifications upon AP power state transitions. The AP power sequence subsystem is built on Zephyr's State Machine Framework (SMF), providing flexibility for AP architecture, chipset, and application specific requirements. ACPI’s global state (G3) and its six sleep power states (S0, S1, S2, S3, S4, S5) are present within the state machine domain. All these ACPI states have three hierarchical levels: - Architecture: is the highest level of the hierarchy, SMF states at this level perform operations that are shared by all designs based on a specific AP CPU architecture. - Chipset: these SMF states drive the power of components and monitor power good signals that are required for a specific AP chipset. - Application: is the bottom level of the hierarchy and these SMF states are reserved for action handlers intended to address platform or application specific computations. Utility macros and functions are also provided to easily follow hierarchy early described. Allowing implementation to register state action handlers, and safely perform state transitions.


Bernardo Salvador Perez Priego

Firmware Engineer, Intel Corporation
Bernardo is a Firmware Engineer, he has been working in Embedded Systems for over a decade. He enjoys expanding his knowledge on different electronic components, fulfilling his passion for delivering highly functional and robust solutions. He holds a Bachelor's degree in Electronics... Read More →

Monday June 26, 2023 12:00 - 12:40 CEST