linux-kernel - [PATCH v2 30/35] drm/bridge: Provide pointers to the connector and crtc in bridge state

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Message-Id: <20250204-bridge-connector-v2-30-35dd6c834e08@kernel.org>
Date: Tue, 04 Feb 2025 15:57:58 +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 30/35] drm/bridge: Provide pointers to the connector and
 crtc in bridge state

Now that connectors are no longer necessarily created by the bridges
drivers themselves but might be created by drm_bridge_connector, it's
pretty hard for bridge drivers to retrieve pointers to the connector and
CRTC they are attached to.

Indeed, the only way to retrieve the CRTC is to follow the drm_bridge
encoder field, and then the drm_encoder crtc field, both of them being
deprecated.

And for the connector, since we can have multiple connectors attached to
a CRTC, we don't really have a reliable way to get it.

Let's provide both pointers in the drm_bridge_state structure so we
don't have to follow deprecated, non-atomic, pointers, and be more
consistent with the other KMS entities.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/drm_atomic_state_helper.c |  5 +++++
 drivers/gpu/drm/drm_bridge.c              |  5 +++++
 include/drm/drm_atomic.h                  | 14 ++++++++++++++
 3 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 519228eb109533d2596e899a57b571fa0995824f..66661dca077215b78dffca7bc1712f56d35e3918 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -777,10 +777,15 @@ EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state);
  * that don't subclass the bridge state.
  */
 void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
 					    struct drm_bridge_state *state)
 {
+	if (state->connector) {
+		drm_connector_put(state->connector);
+		state->connector = NULL;
+	}
+
 	kfree(state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state);
 
 /**
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index ad91a0ac375a9c8cf82834354ec7f654a59a7292..fcff08c7d609477b7cadabc109f0b543a6b9b506 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -803,10 +803,15 @@ static int drm_atomic_bridge_check(struct drm_bridge *bridge,
 		bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
 							       bridge);
 		if (WARN_ON(!bridge_state))
 			return -EINVAL;
 
+		bridge_state->crtc = crtc_state->crtc;
+
+		drm_connector_get(conn_state->connector);
+		bridge_state->connector = conn_state->connector;
+
 		if (bridge->funcs->atomic_check) {
 			ret = bridge->funcs->atomic_check(bridge, bridge_state,
 							  crtc_state, conn_state);
 			if (ret)
 				return ret;
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 7af43062e5ca8c30b3fd600a34543e79137ab3ea..12f3676b85454e81de74c6b5eec700a355d42836 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -1197,10 +1197,24 @@ struct drm_bridge_state {
 	/**
 	 * @bridge: the bridge this state refers to
 	 */
 	struct drm_bridge *bridge;
 
+	/**
+	 * @crtc: CRTC the bridge is connected to, NULL if disabled.
+	 *
+	 * Do not change this directly.
+	 */
+	struct drm_crtc *crtc;
+
+	/**
+	 * @connector: The connector the bridge is connected to, NULL if disabled.
+	 *
+	 * Do not change this directly.
+	 */
+	struct drm_connector *connector;
+
 	/**
 	 * @input_bus_cfg: input bus configuration
 	 */
 	struct drm_bus_cfg input_bus_cfg;
 

-- 
2.48.0