linux-kernel - Re: [PATCH] drm: add missing dependency to DRM_PANEL

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Date:   Sun, 23 Jan 2022 22:05:21 +0100
From:   Luca Weiss <luca@...tu.xyz>
To:     dri-devel@...ts.freedesktop.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: add missing dependency to DRM_PANEL_EDP

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@...tu.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