From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@xxxxxxxxx>
Having an ->atomic_release callback is useful to release shared resources
that get allocated in compute_config(). This function is expected to be
called in the atomic_check() phase before new resources are acquired.
v4: Document that the function is conditionally called and before
other atomic_checks() (Daniel)
v3: Use the new 'for_each_oldnew_connector_in_state()' macro.
v2: Moved the caller hunk to this patch (Daniel)
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Suggested-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
---
drivers/gpu/drm/drm_atomic_helper.c | 19 +++++++++++++++++++
include/drm/drm_modeset_helper_vtables.h | 16 ++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 1403334..c6c8397 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -586,6 +586,25 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
}
}
+ for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
+ const struct drm_connector_helper_funcs *conn_funcs;
+ struct drm_crtc_state *crtc_state;
+
+ conn_funcs = connector->helper_private;
+ if (!conn_funcs->atomic_release)
+ continue;
+
+ if (!old_connector_state->crtc)
+ continue;
+
+ crtc_state = drm_atomic_get_existing_crtc_state(state, old_connector_state->crtc);
+
+ if (crtc_state->connectors_changed ||
+ crtc_state->mode_changed ||
+ (crtc_state->active_changed && !crtc_state->active))
+ conn_funcs->atomic_release(connector, new_connector_state);
+ }
+
return mode_fixup(state);
}
EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
index 091c422..84e80aa 100644
--- a/include/drm/drm_modeset_helper_vtables.h
+++ b/include/drm/drm_modeset_helper_vtables.h
@@ -836,6 +836,22 @@ struct drm_connector_helper_funcs {
*/
struct drm_encoder *(*atomic_best_encoder)(struct drm_connector *connector,
struct drm_connector_state *connector_state);
+
+ /**
+ * @atomic_release:
+ *
+ * This function is conditionally called to release shared resources
+ * when the attached CRTC's mode changes or it's connectors change or
+ * becomes inactive. It is called before the corresponding
+ * &drm_crtc_helper_funcs.atomic_check or
+ * &drm_crtc_helper_funcs.mode_fixup hooks are called.
+ *
+ * NOTE:
+ *
+ * This function is called in the check phase of an atomic update.
+ */
+ void (*atomic_release)(struct drm_connector *connector,
+ struct drm_connector_state *connector_state);
};
/**
--
2.7.4
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