2013/8/30 Jani Nikula <jani.nikula@xxxxxxxxx>:
> Notifying the bios lets it enter power saving states.
>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 7 +++++++
> drivers/gpu/drm/i915/intel_opregion.c | 27 +++++++++++++++++++++++++++
> 2 files changed, 34 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 5339297..7daae2a 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2190,6 +2190,8 @@ extern void intel_opregion_fini(struct drm_device *dev);
> extern void intel_opregion_asle_intr(struct drm_device *dev);
> extern int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
> bool enable);
> +extern int intel_opregion_notify_adapter(struct drm_device *dev,
> + pci_power_t state);
> #else
> static inline void intel_opregion_init(struct drm_device *dev) { return; }
> static inline void intel_opregion_fini(struct drm_device *dev) { return; }
> @@ -2199,6 +2201,11 @@ intel_opregion_notify_encoder(struct intel_encoder *intel_encoder, bool enable)
> {
> return 0;
> }
> +static inline int
> +intel_opregion_notify_adapter(struct drm_device *dev, pci_power_t state)
> +{
> + return 0;
> +}
> #endif
>
> /* intel_acpi.c */
> diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
> index 791991b..05243df 100644
> --- a/drivers/gpu/drm/i915/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/intel_opregion.c
> @@ -342,6 +342,33 @@ int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
> return swsci(dev, SWSCI_SBCB_DISPLAY_POWER_STATE, parm, NULL);
> }
>
> +static const struct {
> + pci_power_t pci_power_state;
> + u32 parm;
> +} power_state_map[] = {
> + { PCI_D0, 0x00 },
> + { PCI_D1, 0x01 },
> + { PCI_D2, 0x02 },
> + { PCI_D3hot, 0x04 },
> + { PCI_D3cold, 0x04 },
> +};
> +
> +int intel_opregion_notify_adapter(struct drm_device *dev, pci_power_t state)
> +{
> + int i;
> +
> + if (!HAS_DDI(dev))
> + return 0;
> +
> + for (i = 0; i < ARRAY_SIZE(power_state_map); i++) {
> + if (state == power_state_map[i].pci_power_state)
> + return swsci(dev, SWSCI_SBCB_ADAPTER_POWER_STATE,
> + power_state_map[i].parm, NULL);
> + }
> +
> + return -EINVAL;
> +}
> +
> static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> --
> 1.7.10.4
>
--
Paulo Zanoni
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