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Commit ecbc5cf3 authored by Jani Nikula's avatar Jani Nikula Committed by Daniel Vetter
Browse files

drm/i915: add opregion function to notify bios of adapter power state 



Notifying the bios lets it enter power saving states.

Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 9c4b0a68

drivers/gpu/drm/i915/i915_drv.h

+7 −0
Original line number Diff line number Diff line
@@ -2197,6 +2197,8 @@ 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; }
@@ -2206,6 +2208,11 @@ 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 */

drivers/gpu/drm/i915/intel_opregion.c

+27 −0
Original line number Diff line number Diff line
@@ -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;