From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Add a small helper for checking whether a connector and
encoder are associated with each other.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_connector.c | 23 +++++++++++++++++++++++
include/drm/drm_connector.h | 3 +++
2 files changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 186febcf4e55..84ff2fcdcb55 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -331,6 +331,29 @@ int drm_mode_connector_attach_encoder(struct drm_connector *connector,
}
EXPORT_SYMBOL(drm_mode_connector_attach_encoder);
+/**
+ * drm_connector_has_possible_encoder - check if the connector and encoder are assosicated with each other
+ * @connector: the connector
+ * @encoder: the encoder
+ *
+ * Returns:
+ * True if @encoder is one of the possible encoders for @connector.
+ */
+bool drm_connector_has_possible_encoder(struct drm_connector *connector,
+ struct drm_encoder *encoder)
+{
+ struct drm_encoder *enc;
+ int i;
+
+ drm_connector_for_each_possible_encoder(connector, enc, i) {
+ if (enc == encoder)
+ return true;
+ }
+
+ return false;
+}
+EXPORT_SYMBOL(drm_connector_has_possible_encoder);
+
static void drm_mode_remove(struct drm_connector *connector,
struct drm_display_mode *mode)
{
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 8de3a3aa516a..9c59485fec36 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1181,6 +1181,9 @@ struct drm_connector *
drm_connector_list_iter_next(struct drm_connector_list_iter *iter);
void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);
+bool drm_connector_has_possible_encoder(struct drm_connector *connector,
+ struct drm_encoder *encoder);
+
/**
* drm_for_each_connector_iter - connector_list iterator macro
* @connector: &struct drm_connector pointer used as cursor
--
2.16.4
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