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

[~andy/linux] / drivers / gpu / drm / i915 / intel_opregion.c

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index ce1c79eedcb1c54a65089c2800b7926669dbd1fe..2ff74912b656a626c3bce2618b8ab4a0f57b2506 100644 (file)
--- 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;