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

Notifying the bios lets it enter power saving states.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2013-08-30 19:40:31 +03:00 committed by Daniel Vetter
parent 9c4b0a6831
commit ecbc5cf340
2 changed files with 34 additions and 0 deletions
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7
drivers/gpu/drm/i915/i915_drv.h
View File

@ -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 */

27
drivers/gpu/drm/i915/intel_opregion.c
View File

@ -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;