Hi Pi-Hsun, Thank you for the patch! Yet something to improve: [auto build test ERROR on 3e14f70c05cda4794901ed8f976de3a88deebcc0] url: https://github.com/0day-ci/linux/commits/Pi-Hsun-Shih/drm-bridge-anx7625-... base: 3e14f70c05cda4794901ed8f976de3a88deebcc0 config: i386-randconfig-r016-20201111 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/96b15cfd320004cab18e33f081007ac3c... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Pi-Hsun-Shih/drm-bridge-anx7625-Add-anx7625-port-switching/20201112-144229 git checkout 96b15cfd320004cab18e33f081007ac3c312a30d # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_i2c_remove': ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_usb_mux_set': ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_register_usb_two_ports': ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_register_usb': ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_register_usb_two_ports': drivers/gpu/drm/bridge/analogix/anx7625.c:1340: undefined reference to `typec_mux_unregister' ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_usb_set_orientation': vim +1943 drivers/gpu/drm/bridge/analogix/anx7625.c 1933 1934 static int anx7625_i2c_remove(struct i2c_client *client) 1935 { 1936 struct anx7625_data *platform = i2c_get_clientdata(client); 1937 int i; 1938 1939 drm_bridge_remove(&platform->bridge); 1940 1941 if (platform->pdata.tx_rx_to_two_ports) 1942 for (i = 0; i < 2; i++) 1944 platform->typec_ports[i].typec_mux); 1945 else 1947 1948 if (platform->pdata.intp_irq) 1949 destroy_workqueue(platform->workqueue); 1950 1951 anx7625_unregister_i2c_dummy_clients(platform); 1952 1953 kfree(platform); 1954 return 0; 1955 } 1956 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org