[PATCH] drm: add missing dependency to DRM_PANEL_EDP

[Luca Weiss]

With CONFIG_DRM_PANEL_EDP=y and CONFIG_DRM_KMS_HELPER=m the compilation
fails:

  drivers/gpu/drm/panel/panel-edp.c:843: undefined reference to `drm_panel_dp_aux_backlight'

Add a dependency on DRM_KMS_HELPER to fix this.

Signed-off-by: Luca Weiss <luca at z3ntu.xyz>
---
I briefly tried "select DRM_KMS_HELPER" but that causes a circular
dependency.
If someone has a better idea how to solve this, feel free correct me.

 drivers/gpu/drm/panel/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 434c2861bb40..fda97837ecb3 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -102,6 +102,7 @@ config DRM_PANEL_SIMPLE
 config DRM_PANEL_EDP
 	tristate "support for simple Embedded DisplayPort panels"
 	depends on OF
+	depends on DRM_KMS_HELPER
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on PM
 	select VIDEOMODE_HELPERS
-- 
2.34.1