[Intel-gfx] [PATCH 4/6] drm/i915: add opregion function to notify bios of adapter power state

[Jani Nikula]

Notifying the bios lets it enter power saving states.

Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       |    3 +++
 drivers/gpu/drm/i915/intel_opregion.c |   27 +++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1703029..e17a9a0 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2179,12 +2179,15 @@ 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; }
 static inline void intel_opregion_asle_intr(struct drm_device *dev) { return; }
 static inline int
 intel_opregion_notify_encoder(struct intel_encoder *intel_encoder, bool enable)
+intel_opregion_notify_adapter(struct drm_device *dev, pci_power_t state)
 {
        return 0;
 }
diff --git a/drivers/gpu/drm/i915/intel_opregion.c 
b/drivers/gpu/drm/i915/intel_opregion.c
index 72a4af6..e47aefc 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -325,6 +325,33 @@ 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;
-- 
1.7.9.5

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