[PATCH v3 07/10] drm/display: hdmi_state_helper: reject Audio IF updates if it's not supported

[Dmitry Baryshkov]

Updating the InfoFrame if it can not be sent over the wire makes no
sense. Change drm_atomic_helper_connector_hdmi_update_audio_infoframe()
and drm_atomic_helper_connector_hdmi_clear_audio_infoframe() to return
an error if Audio InfoFrame callbacks are not implemented.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 5a3817271d91..e8556bf9e1da 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -1061,7 +1061,7 @@ drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *co
 	if (!info->is_hdmi)
 		return 0;
 
-	if (!funcs) {
+	if (!funcs || !funcs->audio.write_infoframe) {
 		drm_dbg_kms(connector->dev, "Function not implemented, bailing.\n");
 		return -EINVAL;
 	}
@@ -1102,7 +1102,7 @@ drm_atomic_helper_connector_hdmi_clear_audio_infoframe(struct drm_connector *con
 	if (!info->is_hdmi)
 		return 0;
 
-	if (!funcs) {
+	if (!funcs || !funcs->audio.write_infoframe) {
 		drm_dbg_kms(connector->dev, "Function not implemented, bailing.\n");
 		return -EINVAL;
 	}

-- 
2.47.3