Re: [PATCH] drm/i915: make system freeze support depend on CONFIG_ACPI_SLEEP

[Imre Deak <imre.deak@intel.com>]

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On Tue, 2014-06-24 at 17:53 +0300, Jani Nikula wrote:
> On Tue, 24 Jun 2014, Imre Deak <imre.deak@intel.com> wrote:
> > On Tue, 2014-06-24 at 16:54 +0300, Jani Nikula wrote:
> >> On Mon, 23 Jun 2014, Imre Deak <imre.deak@intel.com> wrote:
> >> > To achieve further power savings during system freeze (aka connected
> >> > standby, or s0ix) we have to send a PCI_D1 opregion notification. As
> >> > the information about the state we're entering (system freeze,
> >> > suspend to ram or suspend to disk) is only available through the ACPI
> >> > subsystem, make this support depend on the relevant kconfig option.
> >> > Things will still work if this option isn't set, albeit with less than
> >> > optimial power saving.
> >> >
> >> > This also fixes a compile breakage when the option is not set introduced
> >> > in
> >> >
> >> > commit e5747e3adcd67ae27105003ec99fb58cba180105
> >> > Author: Jesse Barnes <jbarnes@virtuousgeek.org>
> >> > Date:   Thu Jun 12 08:35:47 2014 -0700
> >> >
> >> >     drm/i915: send proper opregion notifications on suspend/resume
> >> >
> >> > Reported-by: Randy Dunlap <rdunlap@infradead.org>
> >> > Signed-off-by: Imre Deak <imre.deak@intel.com>
> >> > ---
> >> >  drivers/gpu/drm/i915/i915_drv.c | 7 ++++---
> >> >  1 file changed, 4 insertions(+), 3 deletions(-)
> >> >
> >> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> >> > index 7ae4e2a..43dc8f7 100644
> >> > --- a/drivers/gpu/drm/i915/i915_drv.c
> >> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> >> > @@ -544,10 +544,11 @@ static int i915_drm_freeze(struct drm_device *dev)
> >> >  
> >> >  	i915_save_state(dev);
> >> >  
> >> > -	if (acpi_target_system_state() >= ACPI_STATE_S3)
> >> > -		opregion_target_state = PCI_D3cold;
> >> > -	else
> >> > +	opregion_target_state = PCI_D3cold;
> >> > +#if IS_ENABLED(CONFIG_ACPI_SLEEP)
> >> 
> >> Maybe this should just check for CONFIG_ACPI?
> >
> > I wanted to send the PCI_D1 signal only if we are sure that the target
> > sleep state is S0ix (or S1/2) and fall back to the old behavior to send
> > PCI_D3cold in all other cases.
> >
> > But you are right, it would make much sense if CONFIG_ACPI_SLEEP=n the
> > target state would be always S0ix. Rafael could you confirm this?
> 
> intel_opregion_notify_adapter() is a NOP for CONFIG_ACPI=n anyway.

Ok, but the question for me is what's the target sleep state in case of
CONFIG_ACPI=y and CONFIG_ACPI_SLEEP=n.

>  And AFAICT CONFIG_ACPI=y && CONFIG_ACPI_SLEEP=n is broken.

But it seems like a valid configuration. So it needs to be fixed
separately.

--Imre

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