diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index f03d617edc4c..1617c5098a50 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -849,10 +849,13 @@ static int hdmi_audio_configure(struct sti_hdmi *hdmi)
 	switch (info->channels) {
 	case 8:
 		audio_cfg |= HDMI_AUD_CFG_CH78_VALID;
+		/* fall through */
 	case 6:
 		audio_cfg |= HDMI_AUD_CFG_CH56_VALID;
+		/* fall through */
 	case 4:
 		audio_cfg |= HDMI_AUD_CFG_CH34_VALID | HDMI_AUD_CFG_8CH;
+		/* fall through */
 	case 2:
 		audio_cfg |= HDMI_AUD_CFG_CH12_VALID;
 		break;