On Wed, Oct 18, 2017 at 01:19:08PM +0200, Geert Uytterhoeven wrote: > On Wed, Oct 18, 2017 at 1:02 PM, Mark Brown <broonie@xxxxxxxxxx> wrote: > > On Tue, Oct 10, 2017 at 05:26:17PM +0200, Geert Uytterhoeven wrote: > >> Backup mode is not enabled automatically, as e.g. on Renesas > >> Salvator-X(S) boards enabling backup mode changes the role of the ACC > >> switch from a power switch to a wake-up switch. Hence enabling it > >> prevents the board from being powered off using the ACC switch, which > >> may confuse the user. > > This sounds an awful lot like the standard power/wakeup, though the > > power change is a bit unexpected there. I'm also wondering if it makes > > sense to just only enable the wakeup mode when suspending which > > preserves the power off functionality while also keeping the wakeup > > support. > The ACC switch is not a momentary switch (push button), but a toggle > switch with two positions. > Hence you cannot enable wakeup mode while suspending, as the proper > system suspend/resume procedure is: > 1. Enable backup mode in the PMIC, > 2. Switch ACC off (no-op as backup mode has been enabled), > 3. Suspend to RAM (PSCI suspend) => system suspends, > 4. Switch ACC on => system wakes up. > If you would combine steps 1 and 3, you can no longer do step 2 in between. > Yes, it's complicated :-( I'm confused, I thought this was a physical switch but that's talking about this as something software controlled (at least in step 2)?
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