The DRM panel bridge code is built into the kms helpers module, so we get a link error when trying to use it from a built-in driver while the kms helper is a loadable module:
drivers/gpu/drm/bridge/lvds-encoder.o: In function `lvds_encoder_probe': lvds-encoder.c:(.text+0x124): undefined reference to `devm_drm_panel_bridge_add'
This adds a the same dependency in the lvds-encoder that we use for all the other users of the panel bridge. I did not bisect the problem, but from inspection it seems to date back to the patch that separated out the panel bridge from lvds encoder.
Fixes: 13dfc0540a57 ("drm/bridge: Refactor out the panel wrapper from the lvds-encoder bridge.") Signed-off-by: Arnd Bergmann arnd@arndb.de --- drivers/gpu/drm/bridge/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 6caa47834194..cf47bfa7a050 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -46,6 +46,7 @@ config DRM_DUMB_VGA_DAC config DRM_LVDS_ENCODER tristate "Transparent parallel to LVDS encoder support" depends on OF + select DRM_KMS_HELPER select DRM_PANEL_BRIDGE help Support for transparent parallel to LVDS encoders that don't require