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RE: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full platforms without _S5

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Hi Matt,

> -----Original Message-----
> From: Matt Fleming [mailto:matt@codeblueprint.co.uk]
> Sent: Tuesday, March 15, 2016 4:01 AM
> To: Chen, Yu C
> Cc: linux-acpi@vger.kernel.org; linux-pm@vger.kernel.org; Rafael J. Wysocki;
> Len Brown; Thomas Gleixner; Ingo Molnar; H. Peter Anvin; Zhang, Rui; linux-
> efi@vger.kernel.org; x86@kernel.org; linux-kernel@vger.kernel.org; Ard
> Biesheuvel; Mark Salter
> Subject: Re: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full
> platforms without _S5
> 
> On Fri, 11 Mar, at 04:33:46PM, Chen, Yu C wrote:
> >
> > There is  a future Base-IA platform, we are planning to skip
> > implementing the SLP_TYP register and the S5 object.  (already there
> > will be no S3 and no S4)
> 
> Cool. This is really valuable information that should go into the commit
> message.
> 
> Because if this is the rationale for the change, I don't see why we'd need to
> provide the default stuff. Instead we should just enforce EFI reboot, and
> only add the pm_poweroff_default hook if there is an explicit user in the
> future, IMO.

Do you mean the patch v3 make sense
https://patchwork.kernel.org/patch/8514751/
and we should use efi power off as our first choice, if there is no _S5  available(no acpi_power_off),
even there is a customized  poweroff(driver provided, eg)? 

Meanwhile, the legacy platforms will not be affected because
there is no path to overwrite pm_power_off to efi power off.

thanks,
yu

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[PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full platforms without _S5 Chen Yu <yu.c.chen@intel.com> - 2016-03-11 10:10 +0100
  Re: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full  platforms without _S5 Matt Fleming <matt@codeblueprint.co.uk> - 2016-03-11 17:00 +0100
    RE: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full  platforms without _S5 "Chen, Yu C" <yu.c.chen@intel.com> - 2016-03-11 17:40 +0100
      Re: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full  platforms without _S5 Matt Fleming <matt@codeblueprint.co.uk> - 2016-03-14 21:10 +0100
        RE: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full  platforms without _S5 "Chen, Yu C" <yu.c.chen@intel.com> - 2016-03-16 07:00 +0100
          Re: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full  platforms without _S5 Matt Fleming <matt@codeblueprint.co.uk> - 2016-03-17 15:40 +0100

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