drm/amd/display: get_atomic_property missing for drm_connector_funcs

DRM_IOCTL_MODE_GETCONNECTOR fails with EINVAL on enabling DRIVER_ATOMIC
With this DRM_IOCTL_MODE_GETCONNECTOR returns all the connector properties.
freesync_property and freesync_capable_property return 0 currently.

TESTS(On Chromium OS on Stoney Only)
* Builds without compilation errors.
* 'atomictest' proceeds after applying patch and fails with vblank event
timed out.
* Chromium OS ui comes up.

Signed-off-by: Pratik Vishwakarma <Pratik.Vishwakarma@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_types.c

@@ -1184,6 +1184,48 @@ int amdgpu_dm_connector_atomic_set_property(
 	return ret;
 }
 
+int amdgpu_dm_connector_atomic_get_property(
+	struct drm_connector *connector,
+	const struct drm_connector_state *state,
+	struct drm_property *property,
+	uint64_t *val)
+{
+	struct drm_device *dev = connector->dev;
+	struct amdgpu_device *adev = dev->dev_private;
+	struct dm_connector_state *dm_state =
+		to_dm_connector_state(state);
+	int ret = -EINVAL;
+
+	if (property == dev->mode_config.scaling_mode_property) {
+		switch (dm_state->scaling) {
+		case RMX_CENTER:
+			*val = DRM_MODE_SCALE_CENTER;
+			break;
+		case RMX_ASPECT:
+			*val = DRM_MODE_SCALE_ASPECT;
+			break;
+		case RMX_FULL:
+			*val = DRM_MODE_SCALE_FULLSCREEN;
+			break;
+		case RMX_OFF:
+		default:
+			*val = DRM_MODE_SCALE_NONE;
+			break;
+		}
+		ret = 0;
+	} else if (property == adev->mode_info.underscan_hborder_property) {
+		*val = dm_state->underscan_hborder;
+		ret = 0;
+	} else if (property == adev->mode_info.underscan_vborder_property) {
+		*val = dm_state->underscan_vborder;
+		ret = 0;
+	} else if (property == adev->mode_info.underscan_property) {
+		*val = dm_state->underscan_enable;
+		ret = 0;
+	}
+	return ret;
+}
+
 void amdgpu_dm_connector_destroy(struct drm_connector *connector)
 {
 	struct amdgpu_connector *aconnector = to_amdgpu_connector(connector);
@@ -1246,43 +1288,6 @@ struct drm_connector_state *amdgpu_dm_connector_atomic_duplicate_state(
 	return NULL;
 }
 
-
-/**
- * amdgpu_dm_atomic_get_property - fetch connector property value
- * @connector: connector to fetch property for
- * @state: state containing the property value
- * @property: property to look up
- * @val: pointer to write property value into
- *
- * The DRM core does not store shadow copies of properties for
- * atomic-capable drivers.  This entrypoint is used to fetch
- * the current value of a driver-specific connector property.
- */
-int amdgpu_dm_connector_atomic_get_property(struct drm_connector *connector,
-							  const struct drm_connector_state *state,
-							  struct drm_property *property,
-							  uint64_t *val)
-{
-	int i;
-
-	/*
-	 * TODO: Get properties from atomic state or objs.  Until it's ready,
-	 * continue to look up all property values in the DRM's shadow copy
-	 * in obj->properties->values[].
-	 *
-	 * When the crtc/connector state work matures, this function should
-	 * be updated to read the values out of the state structure instead.
-	 */
-	for (i = 0; i < connector->base.properties->count; i++) {
-		if (connector->base.properties->properties[i] == property) {
-			*val = connector->base.properties->values[i];
-			return 0;
-		}
-	}
-
-	return -EINVAL;
-}
-
 static const struct drm_connector_funcs amdgpu_dm_connector_funcs = {
 	.reset = amdgpu_dm_connector_funcs_reset,
 	.detect = amdgpu_dm_connector_detect,
@@ -1291,7 +1296,7 @@ static const struct drm_connector_funcs amdgpu_dm_connector_funcs = {
 	.atomic_duplicate_state = amdgpu_dm_connector_atomic_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 	.atomic_set_property = amdgpu_dm_connector_atomic_set_property,
-	.atomic_get_property = amdgpu_dm_connector_atomic_get_property,
+	.atomic_get_property = amdgpu_dm_connector_atomic_get_property
 };
 
 static struct drm_encoder *best_encoder(struct drm_connector *connector)

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_types.h

@@ -71,6 +71,12 @@ int amdgpu_dm_connector_atomic_set_property(
 	struct drm_property *property,
 	uint64_t val);
 
+int amdgpu_dm_connector_atomic_get_property(
+	struct drm_connector *connector,
+	const struct drm_connector_state *state,
+	struct drm_property *property,
+	uint64_t *val);
+
 int amdgpu_dm_get_encoder_crtc_mask(struct amdgpu_device *adev);
 
 void amdgpu_dm_connector_init_helper(