in order to directly determine the specific error location of panel_simple_probe from error message as follow: BUG: [ 2.055658] rockchip-drm display-subsystem: bound ff900000.vop (ops vop_component_ops) [ 2.055791] rockchip-vop ff8f0000.vop: missing rockchip,grf property [ 2.056148] rockchip-drm display-subsystem: bound ff8f0000.vop (ops vop_component_ops) [ 2.056505] [drm:rockchip_dp_bind] *ERROR* failed to find panel [ 2.056732] rockchip-drm display-subsystem: failed to bind ff970000.edp (ops rockchip_dp_component_ops): -517 [ 2.057374] rockchip-drm display-subsystem: master bind failed: -517 Signed-off-by: Guochun Huang <hero.huang@rock-chips.com> Change-Id: I2ceeaa9fac3834ad0c4b2bc0a4d8ab79050dfd8b