ARM SoCs expose to software a lot of information about HW knobs for controlling power consumption. As there is no HW to OS abstraction layer (such as ACPI), these knobs tend to be controlled directly by OS drivers. Additionally, each SoC vendor exposes a superset of the standard ARM power states to allow fine-grained control over each component to maximize battery-life. This increases the complexity of the core SoC enablement code inside the kernel as well as the peripheral drivers.
SoC vendors have taken slightly different approaches to implementing their OS power management frameworks. The differences arise for a number of reasons: a lack of design patterns to achieve what they require; due to lack of infrastructure support inside the kernel, and, on occasion, because of intrinsic differences in HW structure.
The Power Management WG shall endeavor to identify design patterns that helps with the implementation of the majority of the usecases that vendors care about. To this end, the WG will look at the entire software stack (kernel, middleware, applications and tools) to help optimize power consumption. The WG is responsible for creating infrastructure, guidelines and tools to enable top-notch power management on ARM SoCs.
Articles: Articles and posts related to our work
PMWG: Information for PMWG team members
Community: Information for community members looking to get involved in power management
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