Hi Mark, > From: Mark Brown, Sent: Monday, June 29, 2020 9:58 PM > > On Mon, Jun 29, 2020 at 02:42:26AM +0000, Yoshihiro Shimoda wrote: > > > From: Mark Brown, Sent: Friday, June 26, 2020 11:39 PM > > Copying in Sudeep for the feedback on firmware interfaces. Thank you very much for the discussion about the firmware. > > > According to the changelog this is all about reflecting changes in the > > > system state done by firmware but there's no interaction with firmware > > > here which means this will be at best fragile. If we need to reflect > > > changes in firmware configuration I'd expect there to be some > > > interaction with firmware about how it is configured, or at least that > > > the configuration would come from the same source. > > > I should have described background of previous patch series though, > > according to previous discussion [1] the firmware side (like PSCI) is > > also fragile unfortunately... So, I thought using regulator-off-in-suspend > > in a regulator was better. > > > On other hand, Ulf is talking about either adding a property (perhaps like > > regulator-off-in-suspend) into a regulator or just adding a new property > > into MMC [2]. What do you think about Ulf' comment? I'm thinking > > adding a new property "full-pwr-cycle-in-suspend" is the best solution. > > This is because using a regulator property and reflecting a state of regulator without > > firmware is fragile, as you said. > > TBH I worry about a property drifting out of sync with the firmware on > systems where the firmware can be updated. I understood it. > Personally my default > assumption would always be that we're going to loose power for anything > except the RAM and whatever is needed for wake sources during suspend so > I find the discussion a bit surprising but in any case that seems like a > better option than trying to shoehorn things in the way the series here > did. Thank you for your comment! So, I'll make such a patch series later. > Like I said in my earlier replies if this is done through the > regulator API I'd expect it to be via the suspend interface. I don't intend to use any regulator API for this issue for now. Best regards, Yoshihiro Shimoda > > [1] > > https://lore.kernel.org/linux-renesas-soc/CAMuHMdXjU7N4oG89YsozGijMpjgKGN6ezw2qm6FeGX=JyRhsvg@xxxxxxxxxxxxxx/ > > > > [2] > > https://lore.kernel.org/linux-renesas-soc/CAPDyKFpiBU1D+a7zb+Ggm0_HZ+YR4=LXJZ5MPytXtT=uBEdjPA@xxxxxxxxxxxxxx/ > > > > Best regards, > > Yoshihiro Shimoda > >
