Add a function to get the old MST topology state, required by a
follow-up i915 patch.
While at it clarify the code comment of
drm_atomic_get_new_mst_topology_state() and add _new prefix
to the new state pointer to remind about its difference from the old
state.
v2: Use old_/new_ prefixes for the state pointers. (Ville)
Cc: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 6.1
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/display/drm_dp_mst_topology.c | 33 ++++++++++++++++---
include/drm/display/drm_dp_mst_helper.h | 3 ++
2 files changed, 32 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index 1990ff5dc7ddd..38dab76ae69ea 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -5364,28 +5364,53 @@ struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_a
}
EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
+/**
+ * drm_atomic_get_old_mst_topology_state: get old MST topology state in atomic state, if any
+ * @state: global atomic state
+ * @mgr: MST topology manager, also the private object in this case
+ *
+ * This function wraps drm_atomic_get_old_private_obj_state() passing in the MST atomic
+ * state vtable so that the private object state returned is that of a MST
+ * topology object.
+ *
+ * Returns:
+ *
+ * The old MST topology state, or NULL if there's no topology state for this MST mgr
+ * in the global atomic state
+ */
+struct drm_dp_mst_topology_state *
+drm_atomic_get_old_mst_topology_state(struct drm_atomic_state *state,
+ struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_private_state *old_priv_state =
+ drm_atomic_get_old_private_obj_state(state, &mgr->base);
+
+ return old_priv_state ? to_dp_mst_topology_state(old_priv_state) : NULL;
+}
+EXPORT_SYMBOL(drm_atomic_get_old_mst_topology_state);
+
/**
* drm_atomic_get_new_mst_topology_state: get new MST topology state in atomic state, if any
* @state: global atomic state
* @mgr: MST topology manager, also the private object in this case
*
- * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
+ * This function wraps drm_atomic_get_new_private_obj_state() passing in the MST atomic
* state vtable so that the private object state returned is that of a MST
* topology object.
*
* Returns:
*
- * The MST topology state, or NULL if there's no topology state for this MST mgr
+ * The new MST topology state, or NULL if there's no topology state for this MST mgr
* in the global atomic state
*/
struct drm_dp_mst_topology_state *
drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr)
{
- struct drm_private_state *priv_state =
+ struct drm_private_state *new_priv_state =
drm_atomic_get_new_private_obj_state(state, &mgr->base);
- return priv_state ? to_dp_mst_topology_state(priv_state) : NULL;
+ return new_priv_state ? to_dp_mst_topology_state(new_priv_state) : NULL;
}
EXPORT_SYMBOL(drm_atomic_get_new_mst_topology_state);
diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h
index f5eb9aa152b14..32c764fb9cb56 100644
--- a/include/drm/display/drm_dp_mst_helper.h
+++ b/include/drm/display/drm_dp_mst_helper.h
@@ -868,6 +868,9 @@ struct drm_dp_mst_topology_state *
drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr);
struct drm_dp_mst_topology_state *
+drm_atomic_get_old_mst_topology_state(struct drm_atomic_state *state,
+ struct drm_dp_mst_topology_mgr *mgr);
+struct drm_dp_mst_topology_state *
drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr);
struct drm_dp_mst_atomic_payload *
--
2.37.1
