Re: [PATCH/RFC 4/5] regulator: bd9571mwv: Add support for backup mode

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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)?

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [Linux Samsung SOC]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux