On 7/19/23 22:40, Manivannan Sadhasivam wrote:
This series adds OPP (Operating Points) support to UFSHCD driver and interconnect support to Qcom UFS driver. Motivation behind adding OPP support is to scale both clocks as well as regulators/performance state dynamically. Currently, UFSHCD just scales clock frequency during runtime with the help of "freq-table-hz" property defined in devicetree. With the addition of OPP tables in devicetree (as done for Qcom SDM845 and SM8250 SoCs in this series) UFSHCD can now scale both clocks and performance state of power domain which helps in power saving. For the addition of OPP support to UFSHCD, there are changes required to the OPP framework and devfreq drivers which are also added in this series. Finally, interconnect support is added to Qcom UFS driver for scaling the interconnect path dynamically. This is required to avoid boot crash in recent SoCs and also to save power during runtime. More information is available in patch 13/13.
How much power can OPP save? I'm asking this since I'm wondering whether the power saved by OPP outweighs the complexity added by this patch series. Thanks, Bart.
