When CONFIG_DRM_KMS_HELPER=m and CONFIG_DRM_PANEL_EDP=y, there is a build error in gpu/drm/panel/panel-edp.o:
arm-linux-gnueabi-ld: drivers/gpu/drm/panel/panel-edp.o: in function `panel_edp_probe': panel-edp.c:(.text+0xf38): undefined reference to `drm_panel_dp_aux_backlight'
Fix this by limiting DRM_PANEL_DEP by the value of the DRM_KMS_HELPER symbol.
Fixes: 5f04e7ce392d ("drm/panel-edp: Split eDP panels out of panel-simple") Signed-off-by: Randy Dunlap rdunlap@infradead.org Reported-by: kernel test robot lkp@intel.com Cc: Arnd Bergmann arnd@arndb.de Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Javier Martinez Canillas javierm@redhat.com Cc: Sam Ravnborg sam@ravnborg.org Cc: Douglas Anderson dianders@chromium.org Cc: Linus Walleij linus.walleij@linaro.org Cc: Thierry Reding thierry.reding@gmail.com Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/panel/Kconfig | 1 + 1 file changed, 1 insertion(+)
--- linux-next-20211117.orig/drivers/gpu/drm/panel/Kconfig +++ linux-next-20211117/drivers/gpu/drm/panel/Kconfig @@ -104,6 +104,7 @@ config DRM_PANEL_EDP depends on OF depends on BACKLIGHT_CLASS_DEVICE depends on PM + depends on DRM_KMS_HELPER select VIDEOMODE_HELPERS select DRM_DP_AUX_BUS help