DRM_DEBUG_DP
DRM_DEBUG_DP("using LINK_RATE_SET: 0x%02x", link->rate_set);
DRM_DEBUG_DP("using LINK_BW_SET: 0x%02x", bw_code);
DRM_DEBUG_DP("aux link status: %x\n", ret);
DRM_DEBUG_DP("aux not connected\n");
DRM_DEBUG_DP("failed to read caps\n");
DRM_DEBUG_DP("failed to read desc\n");