[PATCH v4 1/9] drm/connector: hdmi: accept NULL for Audio Infoframe

[Dmitry Baryshkov]

Allow passing NULL as audio infoframe as a way to disable Audio
Infoframe generation.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index ce96837eea65..5356723d21f5 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -681,7 +681,7 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_infoframes);
 /**
  * drm_atomic_helper_connector_hdmi_update_audio_infoframe - Update the Audio Infoframe
  * @connector: A pointer to the HDMI connector
- * @frame: A pointer to the audio infoframe to write
+ * @frame: A pointer to the audio infoframe to write or NULL to disable sending the frame
  *
  * This function is meant for HDMI connector drivers to update their
  * audio infoframe. It will typically be used in one of the ALSA hooks
@@ -704,10 +704,16 @@ drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *co
 
 	mutex_lock(&connector->hdmi.infoframes.lock);
 
-	memcpy(&infoframe->data, frame, sizeof(infoframe->data));
-	infoframe->set = true;
+	if (frame) {
+		memcpy(&infoframe->data, frame, sizeof(infoframe->data));
+		infoframe->set = true;
+
+		ret = write_infoframe(connector, infoframe);
+	} else {
+		infoframe->set = false;
 
-	ret = write_infoframe(connector, infoframe);
+		ret = clear_infoframe(connector, infoframe);
+	}
 
 	mutex_unlock(&connector->hdmi.infoframes.lock);
 

-- 
2.39.2