On Tue, 2021-03-09 at 11:47 +0800, Ye, Xiang wrote: > Hi Srinivas, Jiri > > On Mon, Mar 08, 2021 at 08:00:41AM -0800, Srinivas Pandruvada wrote: > > On Mon, 2021-03-08 at 11:26 +0100, Jiri Kosina wrote: > > > On Wed, 3 Mar 2021, Ye Xiang wrote: > > > > > > > ISH firmware uses connected standby state bit > > > > (CONNECTED_STANDBY_STATE_BIT bit 1) > > > > to notify current power state to sensors instead of suspend > > > > state > > > > bit (bit 0). > > > > So send both SUSPEND_STATE_BIT and CONNECTED_STANDBY_STATE_BIT > > > > to > > > > firmware > > > > to be compatible with the previous version. > > > > > > Could you please make the changelog more verbose -- namely what > > > user-visible issue this is fixing? > > Xiang, > > > > I think this change is for related to Elkhart Lake for support of > > connected standby (keep listening for sensor events during Linux > > suspend for some sensors). In this way some sensor can wake up the > > system. > This change is for all ISH platform. Currently, ISH firmware use > both SUSPEND_STATE_BIT and CONNECTED_STANDBY_STATE_BIT to identify > system state. It is related to system wake up by ISH and it enable > each > sensor in ISH to be notified the current system state, when system > state > change. What will sensors do with this additional information? I think the individual sensors in ISH can decide whether to power OFF or ON based on this information to save power during system suspend to idle. Thanks, Srinivas > > Thanks > Ye Xiang > > > > > > > > > > > >
