set_mute
.set_mute = dce3_2_set_mute,
.set_mute = dce4_set_mute,
.set_mute = dce4_set_mute,
if (radeon_encoder->audio && radeon_encoder->audio->set_mute)
radeon_encoder->audio->set_mute(encoder, dig->afmt->offset, mute);
.set_mute = r600_set_mute,
void (*set_mute)(struct drm_encoder *encoder, u32 offset, bool mute);
set_mute(cx, ctrl->val);
mute = set_mute(mute);