drm/atomic-helpers: Export drm_atomic_helper_update_legacy_modeset_state

This is useful for drivers which have their own modeset infrastructure
but want to reuse most of the legacy state frobbery from the helpers.
i915 wants this.

v2: Add header declaration.

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index d414e9e..1bcd700 100644 (file)
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -619,8 +619,22 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
        }
 }
 
-static void
-set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
+/**
+ * drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state
+ * @dev: DRM device
+ * @old_state: atomic state object with old state structures
+ *
+ * This function updates all the various legacy modeset state pointers in
+ * connectors, encoders and crtcs. It also updates the timestamping constants
+ * used for precise vblank timestamps by calling
+ * drm_calc_timestamping_constants().
+ *
+ * Drivers can use this for building their own atomic commit if they don't have
+ * a pure helper-based modeset implementation.
+ */
+void
+drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
+                                             struct drm_atomic_state *old_state)
 {
        struct drm_connector *connector;
        struct drm_connector_state *old_conn_state;
@@ -663,6 +677,7 @@ set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
                                                        &crtc->state->adjusted_mode);
        }
 }
+EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
 
 static void
 crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
@@ -741,7 +756,9 @@ void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
                                               struct drm_atomic_state *old_state)
 {
        disable_outputs(dev, old_state);
-       set_routing_links(dev, old_state);
+
+       drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
+
        crtc_set_mode(dev, old_state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);

diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index d665781..6ee0ee5 100644 (file)
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -43,6 +43,10 @@ int drm_atomic_helper_commit(struct drm_device *dev,
 void drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
                                        struct drm_atomic_state *old_state);
 
+void
+drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
+                                             struct drm_atomic_state *old_state);
+
 void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
                                               struct drm_atomic_state *state);
 void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,