_enable_dsi_pll(struct intel_encoder *encoder,           const struct intel_crtc_state *config) {  struct drm_i000_private *dev_priv = to_i000(encoder->base.dev);   DRM_DEBUG_KMS("\n");   mutex_lock(&dev_priv->sb_lock);   vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 