Quoting Kuogee Hsieh (2022-02-17 10:35:30)
Since DRM_DEBUG_DP is deprecated in favor of drm_dbg_dp(NULL, ...), this patch replace all DRM_DEBUG_DP with drm_dbg_dp().
Changes in v4: -- replace (strucr drm_dev *)NULL with drm_dev
Why can't the platform device be used?