[PATCH v2 28/35] drm/bridge: Provide a helper to retrieve current bridge state

[Maxime Ripard <mripard@kernel.org>]

The current bridge state is accessible from the drm_bridge structure,
but since it's fairly indirect it's not easy to figure out.

Provide a helper to retrieve it.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 include/drm/drm_bridge.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index cf7ab89e652a982510ae9df1f5972b9c6eb13cf2..7a3664770c3ab8634a69e953b37a30ac467139b3 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -955,10 +955,31 @@ static inline struct drm_bridge *of_drm_find_bridge(struct device_node *np)
 {
 	return NULL;
 }
 #endif
 
+/**
+ * @drm_bridge_get_current_state() - Get the current bridge state
+ * @bridge: bridge object
+ *
+ * This function must be called with the modeset lock held.
+ *
+ * RETURNS:
+ *
+ * The current bridge state, or NULL if there is none.
+ */
+static inline struct drm_bridge_state *
+drm_bridge_get_current_state(struct drm_bridge *bridge)
+{
+	lockdep_assert_held(&bridge->base.lock.mutex.base);
+
+	if (!bridge)
+		return NULL;
+
+	return drm_priv_to_bridge_state(bridge->base.state);
+}
+
 /**
  * drm_bridge_get_next_bridge() - Get the next bridge in the chain
  * @bridge: bridge object
  *
  * RETURNS:

-- 
2.48.0