These include the drm_connector 'vrr_capable' and the drm_crtc
'vrr_enabled' properties.
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
---
Documentation/gpu/drm-kms.rst | 7 +++++++
drivers/gpu/drm/drm_connector.c | 22 ++++++++++++++++++++++
2 files changed, 29 insertions(+)
diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
index 4b1501b4835b..8da2a178cf85 100644
--- a/Documentation/gpu/drm-kms.rst
+++ b/Documentation/gpu/drm-kms.rst
@@ -575,6 +575,13 @@ Explicit Fencing Properties
.. kernel-doc:: drivers/gpu/drm/drm_atomic_uapi.c
:doc: explicit fencing properties
+
+Variable Refresh Properties
+---------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+ :doc: Variable refresh properties
+
Existing KMS Properties
-----------------------
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index f0deeb7298d0..2a12853ca917 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1254,6 +1254,28 @@ int drm_mode_create_scaling_mode_property(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
+/**
+ * DOC: Variable refresh properties
+ *
+ * Variable refresh rate control is supported via properties on the
+ * &drm_connector and &drm_crtc objects.
+ *
+ * "vrr_capable":
+ * Optional &drm_connector boolean property that drivers should attach
+ * with drm_connector_attach_vrr_capable_property() on connectors that
+ * could support variable refresh rates. Drivers should update the
+ * property value by calling drm_connector_set_vrr_capable_property().
+ *
+ * Absence of the property should indicate absence of support.
+ *
+ * "vrr_enabled":
+ * Default &drm_crtc boolean property that notifies the driver that the
+ * variable refresh rate adjustment should be enabled for the CRTC.
+ *
+ * Support for variable refresh rate will depend on the "vrr_capable"
+ * property exposed on the &drm_connector object.
+ */
+
/**
* drm_connector_attach_vrr_capable_property - creates the
* vrr_capable property
--
2.19.1
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