On Monday 12 October 2015 23:07:28 Robert Jarzmik wrote:
> Arnd Bergmann <a...@arndb.de> writes:
> > The z2 in particular never did, except in the powerdown handler. So if it
> > is unable to wake up reliably from DEEPSLEEP, that may be a reason to use
> > that flag only in the poweroff function but not during normal operation.
> My first thought was :
> This flag's only use is for Suspend to RAM. There might be special
> wirings where the voltage to the RAM is provided out of SYS_EN pin
> control, and therefore PWRMODE_DEEPSLEEP is possible. But the most
> common pattern would be a PMIC, providing voltage to the DRAM through
> Vcc_Mem.
>
> But having a closer look, you're right, I have misunderstood the way z2
> poweroff
> was designed. The setting of poweroff to PWRMODE_DEEPSLEEP +
> pxa27x_cpu_pm_enter() is a whole, it is the closest to a platform halt where
> no
> external chip handles the poweroff phase, and memory is shutdown in deep
> sleep.
>
> Therefore I'll drop Thierry's patch (which would actually break suspend to
> RAM I
> think) and take yours.
Ok, sounds good. thanks!
Arnd
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