[PATCH] drm/i915: Attach a PSR property on eDP

[Chris Wilson <chris@chris-wilson.co.uk>]

Let userspace know the status of Panel Self-Refresh by virtue of a
property on the appropriate connector.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h    |  1 +
 drivers/gpu/drm/i915/intel_dp.c    | 13 +++++++++++++
 drivers/gpu/drm/i915/intel_drv.h   |  1 +
 drivers/gpu/drm/i915/intel_modes.c | 29 +++++++++++++++++++++++++++++
 4 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bdb419c48016..92561bdde201 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -642,6 +642,7 @@ struct i915_psr {
 	bool enabled;
 	bool active;
 	struct delayed_work work;
+	struct drm_property *property;
 };
 
 enum intel_pch {
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e3ad8a7c9fd0..583b30c68b70 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1820,6 +1820,12 @@ static bool intel_edp_psr_match_conditions(struct intel_dp *intel_dp)
 	return true;
 }
 
+static void intel_edp_set_psr_property(struct intel_connector *connector, uint64_t val)
+{
+	drm_object_property_set_value(&connector->base.base,
+				      to_i915(connector->base.dev)->psr.property, val);
+}
+
 static void intel_edp_psr_do_enable(struct intel_dp *intel_dp)
 {
 	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
@@ -1835,6 +1841,8 @@ static void intel_edp_psr_do_enable(struct intel_dp *intel_dp)
 	/* Enable PSR on the host */
 	intel_edp_psr_enable_source(intel_dp);
 
+	intel_edp_set_psr_property(intel_dp->attached_connector, 1);
+
 	dev_priv->psr.enabled = true;
 	dev_priv->psr.active = true;
 }
@@ -1931,6 +1939,7 @@ void intel_edp_psr_inactivate(struct drm_device *dev)
 			intel_dp = enc_to_intel_dp(&encoder->base);
 			intel_crtc = to_intel_crtc(encoder->base.crtc);
 
+			intel_edp_set_psr_property(connector, 0);
 			dev_priv->psr.active = false;
 
 			I915_WRITE(EDP_PSR_CTL(dev), I915_READ(EDP_PSR_CTL(dev))
@@ -3349,6 +3358,9 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
 			dev_priv->psr.sink_support = true;
 			DRM_DEBUG_KMS("Detected EDP PSR Panel.\n");
 		}
+		if (HAS_PSR(dev))
+			intel_edp_set_psr_property(intel_dp->attached_connector,
+						   dev_priv->psr.sink_support ? dev_priv->psr.active : -1);
 	}
 
 	/* Training Pattern 3 support */
@@ -3977,6 +3989,7 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
 	intel_dp->color_range_auto = true;
 
 	if (is_edp(intel_dp)) {
+		intel_attach_psr_property(connector);
 		drm_mode_create_scaling_mode_property(connector->dev);
 		drm_object_attach_property(
 			&connector->base,
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index cfe140a74266..9c8524016e4b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -905,6 +905,7 @@ int intel_connector_update_modes(struct drm_connector *connector,
 int intel_ddc_get_modes(struct drm_connector *c, struct i2c_adapter *adapter);
 void intel_attach_force_audio_property(struct drm_connector *connector);
 void intel_attach_broadcast_rgb_property(struct drm_connector *connector);
+void intel_attach_psr_property(struct drm_connector *connector);
 
 
 /* intel_overlay.c */
diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c
index 0e860f39933d..6c14c97fa8df 100644
--- a/drivers/gpu/drm/i915/intel_modes.c
+++ b/drivers/gpu/drm/i915/intel_modes.c
@@ -126,3 +126,32 @@ intel_attach_broadcast_rgb_property(struct drm_connector *connector)
 
 	drm_object_attach_property(&connector->base, prop, 0);
 }
+
+static const struct drm_prop_enum_list psr_names[] = {
+	{ -1, "Unsupported" },
+	{  0, "Idle" },
+	{  1, "Active" },
+};
+
+void
+intel_attach_psr_property(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_property *prop;
+
+	prop = dev_priv->psr.property;
+	if (prop == NULL) {
+		prop = drm_property_create_enum(dev,
+						DRM_MODE_PROP_ENUM | DRM_MODE_PROP_IMMUTABLE,
+						"Panel Self-Refresh",
+						psr_names,
+						ARRAY_SIZE(psr_names));
+		if (prop == NULL)
+			return;
+
+		dev_priv->psr.property = prop;
+	}
+
+	drm_object_attach_property(&connector->base, prop, 0);
+}
-- 
2.0.0