Hi Georgi, On Wed, 2020-04-01 at 18:09 +0300, Georgi Djakov wrote: > 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. OK, thanks. > > Thanks, > Georgi > > _______________________________________________ > Linux-mediatek mailing list > Linux-mediatek@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-mediatek
