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@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

On Sonntag, 23. Jänner 2022 21:43:23 CET Luca Weiss wrote:
> 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.
> 

Forgot to add, this is the closest "Fixes" I can find, before that commit with 
arm32 qcom_defconfig both beforementioned options were builtin

Fixes: 9d6366e743f3 ("drm: fb_helper: improve CONFIG_FB dependency")

> Signed-off-by: Luca Weiss <luca@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

Hi, any feedback on this patch?

On Sonntag, 23. Jänner 2022 21:43:23 CET Luca Weiss wrote:
> 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@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