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@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Javier Martinez Canillas <javierm@xxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
---
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
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