drm: add encoder attach/detach

2 files changed, 33 insertions, 0 deletions

diff --git a/linux-core/drm_crtc.c b/linux-core/drm_crtc.c
index f6937f44..400df98e 100644
--- a/linux-core/drm_crtc.c
+++ b/linux-core/drm_crtc.c
@@ -2202,3 +2202,31 @@ out:
 	return ret;
 
 }
+
+int drm_mode_output_attach_encoder(struct drm_output *output,
+				   struct drm_encoder *encoder)
+{
+	int i;
+
+	for (i = 0; i < DRM_OUTPUT_MAX_ENCODER; i++) {
+		if (output->encoder_ids[i] == 0) {
+			output->encoder_ids[i] = encoder->id;
+			return 0;
+		}
+	}
+	return -ENOMEM;
+}
+EXPORT_SYMBOL(drm_mode_output_attach_encoder);
+
+void drm_mode_output_detach_encoder(struct drm_output *output,
+				    struct drm_encoder *encoder)
+{
+	int i;
+	for (i = 0; i < DRM_OUTPUT_MAX_ENCODER; i++) {
+		if (output->encoder_ids[i] == encoder->id) {
+			output->encoder_ids[i] = 0;
+			break;
+		}
+	}
+}
+EXPORT_SYMBOL(drm_mode_output_detach_encoder);
diff --git a/linux-core/drm_crtc.h b/linux-core/drm_crtc.h
index ed8467e3..04e0d033 100644
--- a/linux-core/drm_crtc.h
+++ b/linux-core/drm_crtc.h
@@ -629,6 +629,11 @@ extern int drm_property_add_enum(struct drm_property *property, int index,
 extern bool drm_create_tv_properties(struct drm_device *dev, int num_formats,
 				     char *formats[]);
 
+extern int drm_mode_output_attach_encoder(struct drm_output *output,
+					  struct drm_encoder *encoder);
+extern void drm_mode_output_detach_encoder(struct drm_output *output,
+					   struct drm_encoder *encoder);
+
 /* IOCTLs */
 extern int drm_mode_getresources(struct drm_device *dev,
 				 void *data, struct drm_file *file_priv);