1 views collected around this technical thread.
Using Qualcomm’s Adreno GPU as a case study, the article explains how the Linux devfreq framework enables GPU frequency scaling by creating a kgsl devfreq device and an msm‑adreno‑tz governor, detailing their initialization, event handling, target‑frequency computation, and the kernel callbacks that apply the new rates.
BUS DCVS dynamically scales DDR bus frequency and voltage using bandwidth‑monitor (bw_hwmon) and memory‑latency (memlat) governors within the Linux devfreq framework, aggregating votes from CPU, GPU, and other masters to balance performance and power across varied workloads such as audio playback and high‑definition video streaming.
Linux’s devfreq framework provides a generic DVFS subsystem for non‑CPU devices, defining standardized kernel‑space structures (devfreq_profile, devfreq_governor, devfreq_device) and sysfs user‑space interfaces, and managing device initialization, frequency scaling via governors, and clean removal, enabling flexible power‑performance optimization across heterogeneous SoC components.