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

[Maxime Ripard]

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 <mrip...@kernel.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