state->zpos_changed = false;
state->commit = NULL;
state->event = NULL;
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c
b/drivers/gpu/drm/drm_atomic_uapi.c
index 0bb27a24a55c..32a4cf8a01c3 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -433,6 +433,10 @@ static int drm_atomic_crtc_set_property(struct drm_crtc
*crtc,
ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
drm_property_blob_put(mode);
return ret;
+ } else if (property == config->prop_variable_refresh) {
+ if (state->variable_refresh != val)
+ state->variable_refresh_changed = true;
+ state->variable_refresh = val;
} else if (property == config->degamma_lut_property) {
ret = drm_atomic_replace_property_blob_from_id(dev,
&state->degamma_lut,
@@ -491,6 +495,8 @@ drm_atomic_crtc_get_property(struct drm_crtc *crtc,
*val = state->active;
else if (property == config->prop_mode_id)
*val = (state->mode_blob) ? state->mode_blob->base.id : 0;
+ else if (property == config->prop_variable_refresh)
+ *val = state->variable_refresh;
else if (property == config->degamma_lut_property)
*val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
else if (property == config->ctm_property)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 5f488aa80bcd..ca33d6fb90ac 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -340,6 +340,8 @@ int drm_crtc_init_with_planes(struct drm_device *dev,
struct drm_crtc *crtc,
drm_object_attach_property(&crtc->base, config->prop_mode_id,
0);
drm_object_attach_property(&crtc->base,
config->prop_out_fence_ptr, 0);
+ drm_object_attach_property(&crtc->base,
+ config->prop_variable_refresh, 0);
}
return 0;
diff --git a/drivers/gpu/drm/drm_mode_config.c
b/drivers/gpu/drm/drm_mode_config.c
index ee80788f2c40..1287c161d65d 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -310,6 +310,12 @@ static int drm_mode_create_standard_properties(struct
drm_device *dev)
return -ENOMEM;
dev->mode_config.prop_mode_id = prop;
+ prop = drm_property_create_bool(dev, 0,
+ "VARIABLE_REFRESH");
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.prop_variable_refresh = prop;
+
prop = drm_property_create(dev,
DRM_MODE_PROP_BLOB,
"DEGAMMA_LUT", 0);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index b21437bc95bf..32b77f18ce6d 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -168,6 +168,12 @@ struct drm_crtc_state {
* drivers to steer the atomic commit control flow.
*/
bool color_mgmt_changed : 1;
+ /**
+ * @variable_refresh_changed: Variable refresh support has changed
+ * on the CRTC. Used by the atomic helpers and drivers to steer the
+ * atomic commit control flow.
+ */
+ bool variable_refresh_changed : 1;
/**
* @no_vblank:
@@ -290,6 +296,13 @@ struct drm_crtc_state {
*/
u32 pageflip_flags;
+ /**
+ * @variable_refresh:
+ *
+ * Indicates whether the CRTC is suitable for variable refresh rate.
+ */
+ bool variable_refresh;
+
/**
* @event:
*
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 928e4172a0bb..1290191cd96e 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -639,6 +639,14 @@ struct drm_mode_config {
* connectors must be of and active must be set to disabled, too.
*/
struct drm_property *prop_mode_id;
+ /**
+ * @prop_variable_refresh: Default atomic CRTC property to indicate
+ * whether the CRTC is suitable for variable refresh rate support.
+ *
+ * This is only an indication of support, not whether variable
+ * refresh is active on the CRTC.
+ */
+ struct drm_property *prop_variable_refresh;
/**
* @dvi_i_subconnector_property: Optional DVI-I property to
--
2.19.0
