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

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Message-Id: <20250204-bridge-connector-v2-28-35dd6c834e08@kernel.org>
Date: Tue, 04 Feb 2025 15:57:56 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Douglas Anderson <dianders@...omium.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Maxime Ripard <mripard@...nel.org>
Subject: [PATCH v2 28/35] drm/bridge: Provide a helper to retrieve current
 bridge state

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@...nel.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