drm/atomic-helper: Export and namespace some functions

Export and namespace those not prefixed with drm_* so
it becomes possible to write custom commit tail functions
in individual drivers using the helper infrastructure.

Tested-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Cc: stable@vger.kernel.org # v6.17+
Fixes: c9b1150a68d9 ("drm/atomic-helper: Re-order bridge chain pre-enable and post-disable")
Reviewed-by: Aradhya Bhatia <aradhya.bhatia@linux.dev>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Tested-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20251205-drm-seq-fix-v1-3-fda68fa1b3de@ideasonboard.com

2 files changed, 121 insertions, 23 deletions

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index ef97f37560b2..5beea645035f 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1162,8 +1162,18 @@ crtc_needs_disable(struct drm_crtc_state *old_state,
 	       new_state->self_refresh_active;
 }
 
-static void
-encoder_bridge_disable(struct drm_device *dev, struct drm_atomic_state *state)
+/**
+ * drm_atomic_helper_commit_encoder_bridge_disable - disable bridges and encoder
+ * @dev: DRM device
+ * @state: the driver state object
+ *
+ * Loops over all connectors in the current state and if the CRTC needs
+ * it, disables the bridge chain all the way, then disables the encoder
+ * afterwards.
+ */
+void
+drm_atomic_helper_commit_encoder_bridge_disable(struct drm_device *dev,
+						struct drm_atomic_state *state)
 {
 	struct drm_connector *connector;
 	struct drm_connector_state *old_conn_state, *new_conn_state;
@@ -1229,9 +1239,18 @@ encoder_bridge_disable(struct drm_device *dev, struct drm_atomic_state *state)
 		}
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_commit_encoder_bridge_disable);
 
-static void
-crtc_disable(struct drm_device *dev, struct drm_atomic_state *state)
+/**
+ * drm_atomic_helper_commit_crtc_disable - disable CRTSs
+ * @dev: DRM device
+ * @state: the driver state object
+ *
+ * Loops over all CRTCs in the current state and if the CRTC needs
+ * it, disables it.
+ */
+void
+drm_atomic_helper_commit_crtc_disable(struct drm_device *dev, struct drm_atomic_state *state)
 {
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
@@ -1282,9 +1301,18 @@ crtc_disable(struct drm_device *dev, struct drm_atomic_state *state)
 			drm_crtc_vblank_put(crtc);
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_commit_crtc_disable);
 
-static void
-encoder_bridge_post_disable(struct drm_device *dev, struct drm_atomic_state *state)
+/**
+ * drm_atomic_helper_commit_encoder_bridge_post_disable - post-disable encoder bridges
+ * @dev: DRM device
+ * @state: the driver state object
+ *
+ * Loops over all connectors in the current state and if the CRTC needs
+ * it, post-disables all encoder bridges.
+ */
+void
+drm_atomic_helper_commit_encoder_bridge_post_disable(struct drm_device *dev, struct drm_atomic_state *state)
 {
 	struct drm_connector *connector;
 	struct drm_connector_state *old_conn_state, *new_conn_state;
@@ -1335,15 +1363,16 @@ encoder_bridge_post_disable(struct drm_device *dev, struct drm_atomic_state *sta
 		drm_bridge_put(bridge);
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_commit_encoder_bridge_post_disable);
 
 static void
 disable_outputs(struct drm_device *dev, struct drm_atomic_state *state)
 {
-	encoder_bridge_disable(dev, state);
+	drm_atomic_helper_commit_encoder_bridge_disable(dev, state);
 
-	encoder_bridge_post_disable(dev, state);
+	drm_atomic_helper_commit_encoder_bridge_post_disable(dev, state);
 
-	crtc_disable(dev, state);
+	drm_atomic_helper_commit_crtc_disable(dev, state);
 }
 
 /**
@@ -1446,8 +1475,17 @@ void drm_atomic_helper_calc_timestamping_constants(struct drm_atomic_state *stat
 }
 EXPORT_SYMBOL(drm_atomic_helper_calc_timestamping_constants);
 
-static void
-crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *state)
+/**
+ * drm_atomic_helper_commit_crtc_set_mode - set the new mode
+ * @dev: DRM device
+ * @state: the driver state object
+ *
+ * Loops over all connectors in the current state and if the mode has
+ * changed, change the mode of the CRTC, then call down the bridge
+ * chain and change the mode in all bridges as well.
+ */
+void
+drm_atomic_helper_commit_crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *state)
 {
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *new_crtc_state;
@@ -1508,6 +1546,7 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *state)
 		drm_bridge_put(bridge);
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_commit_crtc_set_mode);
 
 /**
  * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
@@ -1531,12 +1570,21 @@ void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
 	drm_atomic_helper_update_legacy_modeset_state(dev, state);
 	drm_atomic_helper_calc_timestamping_constants(state);
 
-	crtc_set_mode(dev, state);
+	drm_atomic_helper_commit_crtc_set_mode(dev, state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
 
-static void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
-						struct drm_atomic_state *state)
+/**
+ * drm_atomic_helper_commit_writebacks - issue writebacks
+ * @dev: DRM device
+ * @state: atomic state object being committed
+ *
+ * This loops over the connectors, checks if the new state requires
+ * a writeback job to be issued and in that case issues an atomic
+ * commit on each connector.
+ */
+void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
+					 struct drm_atomic_state *state)
 {
 	struct drm_connector *connector;
 	struct drm_connector_state *new_conn_state;
@@ -1555,9 +1603,18 @@ static void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
 		}
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_commit_writebacks);
 
-static void
-encoder_bridge_pre_enable(struct drm_device *dev, struct drm_atomic_state *state)
+/**
+ * drm_atomic_helper_commit_encoder_bridge_pre_enable - pre-enable bridges
+ * @dev: DRM device
+ * @state: atomic state object being committed
+ *
+ * This loops over the connectors and if the CRTC needs it, pre-enables
+ * the entire bridge chain.
+ */
+void
+drm_atomic_helper_commit_encoder_bridge_pre_enable(struct drm_device *dev, struct drm_atomic_state *state)
 {
 	struct drm_connector *connector;
 	struct drm_connector_state *new_conn_state;
@@ -1588,9 +1645,18 @@ encoder_bridge_pre_enable(struct drm_device *dev, struct drm_atomic_state *state
 		drm_bridge_put(bridge);
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_commit_encoder_bridge_pre_enable);
 
-static void
-crtc_enable(struct drm_device *dev, struct drm_atomic_state *state)
+/**
+ * drm_atomic_helper_commit_crtc_enable - enables the CRTCs
+ * @dev: DRM device
+ * @state: atomic state object being committed
+ *
+ * This loops over CRTCs in the new state, and of the CRTC needs
+ * it, enables it.
+ */
+void
+drm_atomic_helper_commit_crtc_enable(struct drm_device *dev, struct drm_atomic_state *state)
 {
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *old_crtc_state;
@@ -1619,9 +1685,18 @@ crtc_enable(struct drm_device *dev, struct drm_atomic_state *state)
 		}
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_commit_crtc_enable);
 
-static void
-encoder_bridge_enable(struct drm_device *dev, struct drm_atomic_state *state)
+/**
+ * drm_atomic_helper_commit_encoder_bridge_enable - enables the bridges
+ * @dev: DRM device
+ * @state: atomic state object being committed
+ *
+ * This loops over all connectors in the new state, and of the CRTC needs
+ * it, enables the entire bridge chain.
+ */
+void
+drm_atomic_helper_commit_encoder_bridge_enable(struct drm_device *dev, struct drm_atomic_state *state)
 {
 	struct drm_connector *connector;
 	struct drm_connector_state *new_conn_state;
@@ -1664,6 +1739,7 @@ encoder_bridge_enable(struct drm_device *dev, struct drm_atomic_state *state)
 		drm_bridge_put(bridge);
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_commit_encoder_bridge_enable);
 
 /**
  * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
@@ -1682,11 +1758,11 @@ encoder_bridge_enable(struct drm_device *dev, struct drm_atomic_state *state)
 void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 					      struct drm_atomic_state *state)
 {
-	crtc_enable(dev, state);
+	drm_atomic_helper_commit_crtc_enable(dev, state);
 
-	encoder_bridge_pre_enable(dev, state);
+	drm_atomic_helper_commit_encoder_bridge_pre_enable(dev, state);
 
-	encoder_bridge_enable(dev, state);
+	drm_atomic_helper_commit_encoder_bridge_enable(dev, state);
 
 	drm_atomic_helper_commit_writebacks(dev, state);
 }
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 53382fe93537..e154ee4f0696 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -60,6 +60,12 @@ int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
 int drm_atomic_helper_check_planes(struct drm_device *dev,
 			       struct drm_atomic_state *state);
 int drm_atomic_helper_check_crtc_primary_plane(struct drm_crtc_state *crtc_state);
+void drm_atomic_helper_commit_encoder_bridge_disable(struct drm_device *dev,
+						     struct drm_atomic_state *state);
+void drm_atomic_helper_commit_crtc_disable(struct drm_device *dev,
+					   struct drm_atomic_state *state);
+void drm_atomic_helper_commit_encoder_bridge_post_disable(struct drm_device *dev,
+							  struct drm_atomic_state *state);
 int drm_atomic_helper_check(struct drm_device *dev,
 			    struct drm_atomic_state *state);
 void drm_atomic_helper_commit_tail(struct drm_atomic_state *state);
@@ -89,8 +95,24 @@ drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
 void
 drm_atomic_helper_calc_timestamping_constants(struct drm_atomic_state *state);
 
+void drm_atomic_helper_commit_crtc_set_mode(struct drm_device *dev,
+					    struct drm_atomic_state *state);
+
 void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
 					       struct drm_atomic_state *state);
+
+void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
+					 struct drm_atomic_state *state);
+
+void drm_atomic_helper_commit_encoder_bridge_pre_enable(struct drm_device *dev,
+							struct drm_atomic_state *state);
+
+void drm_atomic_helper_commit_crtc_enable(struct drm_device *dev,
+					  struct drm_atomic_state *state);
+
+void drm_atomic_helper_commit_encoder_bridge_enable(struct drm_device *dev,
+						    struct drm_atomic_state *state);
+
 void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 					  struct drm_atomic_state *old_state);