From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Thu, 28 Jun 2018 16:13:13 +0300
Subject: drm: Add drm_connector_has_possible_encoder()
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Git-commit: 38cb8d96933eb07231073efdcd24a6ffa43b23e6
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Add a small helper for checking whether a connector and
encoder are associated with each other.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180628131315.14156-8-ville.syrjala@linux.intel.com
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/drm_connector.c |   23 +++++++++++++++++++++++
 include/drm/drm_connector.h     |    3 +++
 2 files changed, 26 insertions(+)

--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -331,6 +331,29 @@ int drm_mode_connector_attach_encoder(st
 }
 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)
 {
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1187,6 +1187,9 @@ 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