[PATCH/RFC v2 1/2] firmware: psci: call pm_set_suspend_via_firmware()

[Yoshihiro Shimoda]

Hi Sudeep,

> From: Sudeep Holla, Sent: Monday, June 29, 2020 11:33 PM
> 
> (This patch never made it to my inbox, may be due to ALKML issues on that day)
> 
> On Fri, Jun 19, 2020 at 08:29:02PM +0900, Yoshihiro Shimoda wrote:
> > Call pm_set_suspend_via_firmware() in .begin() of psci_suspend_ops
> > to use pm_suspend_via_firmware() on PSCI environment.
> >
> 
> I don't have issues with this change as such, but I need to understand
> how and why this is used. I will comment on that separately.

I thought MMC driver could use this API to detect whether the firmware was suspending or not.
However, Ulf said this was not a good way because all implementation of PSCI
will not turn the power off while system suspend [1]. Also, as you and Mark said on other
email thread [2], the current PSCI specification cannot inform system suspend state
to OS (Linux).

So, I think I should recall this patch because this cannot get expected information.


[1]
https://lore.kernel.org/linux-renesas-soc/CAPDyKFq-dEPaU094hrk2xg18VpJAsbnf8enieFmcMhKiB1bW1A@mail.gmail.com/


https://lore.kernel.org/linux-renesas-soc/CAMuHMdXh1Hh6H35Mp8hBJBykUucRNwxTmW+U9SHM+xhrcwasDA@mail.gmail.com/T/#m442a2ce972cfdb3ff33637c120c8d096e4d07af8

Best regards,
Yoshihiro Shimoda

> --
> Regards,
> Sudeep