Hi Henry, On 3/13/20 11:34, Henry Chen wrote: > 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 3 frameworks basically: > > 1. interconnect framework: to aggregate the bandwidth > requirements from different clients > > [1] https://patchwork.kernel.org/cover/10766329/ > > Below is the emi bandwidth map of mt8183. There has a hw module "DRAM scheduler" > which used to control the throughput. The DVFSRC will collect forecast data > of dram bandwidth from SW consumers(camera/gpu...), and according the forecast > to change the DRAM frequency > > ICC provider ICC Nodes > ---- ---- > --------- |CPU | |--->|VPU | > ----- | |-----> ---- | ---- > |DRAM |--|DRAM | ---- | ---- > | |--|scheduler|----->|GPU | |--->|DISP| > | |--|(EMI) | ---- | ---- > | |--| | ----- | ---- > ----- | |----->|MMSYS|--|--->|VDEC| > --------- ----- | ---- > /|\ | ---- > |change DRAM freq |--->|VENC| > ---------- | ---- > | DVFSR | | > | | | ---- > ---------- |--->|IMG | > | ---- > | ---- > |--->|CAM | > ---- It would be useful to also add the above diagram into the commit text of patch 09/13. By doing so, it will be saved into the history, as cover letters are discarded. Thanks, Georgi
