[PATCH] drm/i915: Add a DRM property "psr"

[Siva Chandra <sivachandra@chromium.org>]

This property helps one turn PSR "on" and "off" via xrandr.
The default value is same as that of the module param i915.enable_psr.

Signed-off-by: Siva Chandra <sivachandra@google.com>
---
 drivers/gpu/drm/i915/i915_drv.h |  6 ++++++
 drivers/gpu/drm/i915/intel_dp.c | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 70fbe90..83e6303 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1607,6 +1607,7 @@ typedef struct drm_i915_private {
 
 	struct drm_property *broadcast_rgb_property;
 	struct drm_property *force_audio_property;
+	struct drm_property *psr_property;
 
 	uint32_t hw_context_size;
 	struct list_head context_list;
@@ -1661,6 +1662,11 @@ enum hdmi_force_audio {
 	HDMI_AUDIO_ON,			/* force turn on HDMI audio */
 };
 
+enum psr_state {
+	EDP_PSR_ON,
+	EDP_PSR_OFF
+};
+
 #define I915_GTT_OFFSET_NONE ((u32)-1)
 
 struct drm_i915_gem_object_ops {
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 59ee4dc..c4546fa 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3197,6 +3197,33 @@ static int intel_dp_get_modes(struct drm_connector *connector)
 	return 0;
 }
 
+static const struct drm_prop_enum_list psr_names[] = {
+	{ EDP_PSR_ON, "on" },
+	{ EDP_PSR_OFF, "off" }
+};
+
+static 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,
+			i915.enable_psr ? EDP_PSR_ON : EDP_PSR_OFF,
+			"psr",
+			psr_names,
+			ARRAY_SIZE(psr_names));
+		if (prop == NULL)
+			return;
+
+		dev_priv->psr_property = prop;
+	}
+	drm_object_attach_property(&connector->base, prop, 0);
+}
+
 static bool
 intel_dp_detect_audio(struct drm_connector *connector)
 {
@@ -3302,6 +3329,15 @@ intel_dp_set_property(struct drm_connector *connector,
 		goto done;
 	}
 
+	if (is_edp(intel_dp) && property == dev_priv->psr_property) {
+		if (val == EDP_PSR_ON)
+			intel_edp_psr_enable(intel_dp);
+		else
+			intel_edp_psr_disable(intel_dp);
+
+		return 0;
+	}
+
 	return -EINVAL;
 
 done:
@@ -3424,6 +3460,7 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
 {
 	struct intel_connector *intel_connector = to_intel_connector(connector);
 
+	intel_attach_psr_property(connector);
 	intel_attach_force_audio_property(connector);
 	intel_attach_broadcast_rgb_property(connector);
 	intel_dp->color_range_auto = true;
-- 
1.9.0.279.gdc9e3eb