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@xxxxxxxxxxxxxxxx>
Date: Thu Jun 12 08:35:47 2014 -0700
drm/i915: send proper opregion notifications on suspend/resume
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
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)
+ if (acpi_target_system_state() < ACPI_STATE_S3)
opregion_target_state = PCI_D1;
+#endif
intel_opregion_notify_adapter(dev, opregion_target_state);
intel_uncore_forcewake_reset(dev, false);
--
1.8.4
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