[RFC,0/7] Add driver for dvfsrc and add support for active state of scpsys on mt8183
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Message ID 1546436644-19234-1-git-send-email-henryc.chen@mediatek.com
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  • Add driver for dvfsrc and add support for active state of scpsys on mt8183
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Henry Chen Jan. 2, 2019, 1:43 p.m. UTC
The patchsets add support for MediaTek hardware module named DVFSRC
(dynamic voltage and frequency scaling resource collector). The DVFSRC is
a HW module which is used to collect all the requests from both software
and hardware and turn into the decision of minimum operating voltage and
minimum DRAM frequency to fulfill those requests.

So, This series is to implement the dvfsrc driver to collect all the
requests of operating voltage or DRAM bandwidth from other device drivers
likes GPU/Camera through 2 frameworks basically:

1. PM_QOS_MEMORY_BANDWIDTH from PM QOS: to aggregate the bandwidth
   requirements from different clients
2. Active state management of power domains[1]: to handle the operating
   voltage opp requirement from different power domains

[1] https://lwn.net/Articles/744047/