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Tuesday, October 27 • 18:30 - 19:20
Optimizing and Developing Non-CPU Device Power Management by DEVFREQ - Chanwoo Choi, Samsung Electronics

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Power Management is necessary for embedded devices because of the limited power capacity. Kernel provides DEVFREQ (Device Frequency) framework to optimize the power management for Non-CPU devices such as GPU, memory bus, storage and so on. The market requires high-quality image generated by GPU and data transfer via memory bus quickly and low latency for accessing the storage. In result, the power is more used than before. The power management for Non-CPU device is mandatory on embedded device. DEVFREQ provides the multiple governors for supporting DVFS and allows user to add their own governor instead of using default governors. But, DVFS feature is not enough to meet the performance demands. It supports PM_QOS interface to set the min/max requirements by user and collaborates with interconnect framework in order to guarantee the min/max bus bandwidth. Also, it is connected with thermal subsystem to protect overheat of device. Like this, DEVFREQ provides the power-management mechanism and the extensible flexibility to user. In this session, explain how to optimize the power management with DEVFREQ and how to develop DEVFREQ driver.

Speakers
avatar for Chanwoo Choi

Chanwoo Choi

Linux Kernel Developer, Samsung Electronics
Chanwoo Choi has been working in the Linux Kernel over 11 years as a Linux kernel developer and maintainer at Samsung Electronics since 2009. He has been working in Linux Kernel community as Maintainer for DEVFREQ, EXTCON and Samsung SoC Clock-Controller. He developed the ARM SoC's... Read More →



Tuesday October 27, 2020 18:30 - 19:20 GMT
ELC Theater