1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sti/sti_mixer.c b/drivers/gpu/drm/sti/sti_mixer.c
index 79f369db9fb6..6bcdf3f86d22 100644
--- a/drivers/gpu/drm/sti/sti_mixer.c
+++ b/drivers/gpu/drm/sti/sti_mixer.c
@@ -215,6 +215,15 @@ int sti_mixer_set_layer_status(struct sti_mixer *mixer,
         return 0;
 }
 
+void sti_mixer_clear_all_layers(struct sti_mixer *mixer)
+{
+        u32 val;
+
+        DRM_DEBUG_DRIVER("%s clear all layer\n", sti_mixer_to_str(mixer));
+        val = sti_mixer_reg_read(mixer, GAM_MIXER_CTL) & 0xFFFF0000;
+        sti_mixer_reg_write(mixer, GAM_MIXER_CTL, val);
+}
+
 void sti_mixer_set_matrix(struct sti_mixer *mixer)
 {
         unsigned int i;