The Analogix DRM ANX7625 bridge driver uses mips_dsi_() function interfaces so it should select DRM_MIPI_DSI to prevent build errors. ERROR: modpost: "mipi_dsi_attach" [drivers/gpu/drm/bridge/analogix/anx7625.ko] undefined! ERROR: modpost: "mipi_dsi_device_register_full" [drivers/gpu/drm/bridge/analogix/anx7625.ko] undefined! ERROR: modpost: "of_find_mipi_dsi_host_by_node" [drivers/gpu/drm/bridge/analogix/anx7625.ko] undefined! ERROR: modpost: "mipi_dsi_device_unregister" [drivers/gpu/drm/bridge/analogix/anx7625.ko] undefined! ERROR: modpost: "mipi_dsi_detach" [drivers/gpu/drm/bridge/analogix/anx7625.ko] undefined! Fixes: 8bdfc5dae4e3 ("drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP") Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Reported-by: kernel test robot <lkp@xxxxxxxxx> Cc: Xin Ji <xji@xxxxxxxxxxxxxxxx> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx Cc: Andrzej Hajda <a.hajda@xxxxxxxxxxx> Cc: Neil Armstrong <narmstrong@xxxxxxxxxxxx> Cc: Robert Foss <robert.foss@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx --- drivers/gpu/drm/bridge/analogix/Kconfig | 1 + 1 file changed, 1 insertion(+) --- linux-next-20210414.orig/drivers/gpu/drm/bridge/analogix/Kconfig +++ linux-next-20210414/drivers/gpu/drm/bridge/analogix/Kconfig @@ -30,6 +30,7 @@ config DRM_ANALOGIX_ANX7625 tristate "Analogix Anx7625 MIPI to DP interface support" depends on DRM depends on OF + select DRM_MIPI_DSI help ANX7625 is an ultra-low power 4K mobile HD transmitter designed for portable devices. It converts MIPI/DPI to