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Date:   Fri, 7 Sep 2018 22:53:04 +0530
From:   Naresh Kamboju <>
To:     Jon Hunter <>
Cc:     Arnd Bergmann <>,
        Maxime Ripard <>,
        Chen-Yu Tsai <>,,,
        open list <>
Subject: Re: [PATCH] [v3] drm/sun4i: fix build failure with CONFIG_DRM_SUN8I_MIXER=m

On 7 September 2018 at 15:11, Jon Hunter <> wrote:
> On 11/07/18 15:43, Arnd Bergmann wrote:
>> Having DRM_SUN4I built-in but DRM_SUN8I_MIXER as a loadable module results in
>> a link error, as we try to access a symbol from the sun8i_tcon_top.ko module:
>> ERROR: "sun8i_tcon_top_of_table" [drivers/gpu/drm/sun4i/sun8i-drm-hdmi.ko] undefined!
>> ERROR: "sun8i_tcon_top_of_table" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
>> This solves the problem by adding a silent symbol for the tcon_top module,
>> building it as a separate module in exactly the cases that we need it,
>> but in a way that it is reachable by the other modules.
>> Fixes: 57e23de02f48 ("drm/sun4i: DW HDMI: Expand algorithm for possible crtcs")
>> Fixes: ef0cf6441fbb ("drm/sun4i: Add support for traversing graph with TCON TOP")
>> Signed-off-by: Arnd Bergmann <>
> I am seeing the following on today's -next (20180907) as well the last
> few -next versions for that matter ...
> ERROR: "sun8i_tcon_top_de_config" [drivers/gpu/drm/sun4i/sun4i-tcon.ko] undefined!
> ERROR: "sun8i_tcon_top_set_hdmi_src" [drivers/gpu/drm/sun4i/sun4i-tcon.ko] undefined!
> ERROR: "sun8i_tcon_top_of_table" [drivers/gpu/drm/sun4i/sun4i-tcon.ko] undefined!
> Seems like this issue has cropped up again as Arnd's fix is present. I
> am seeing this on ARM64 builds.

I do notice these failures on ARM64 builds on linux next 20180906 and 20180907.

11:40:55 | ERROR: "sun8i_tcon_top_de_config"
[drivers/gpu/drm/sun4i/sun4i-tcon.ko] undefined!
11:40:55 | ERROR: "sun8i_tcon_top_set_hdmi_src"
[drivers/gpu/drm/sun4i/sun4i-tcon.ko] undefined!
11:40:55 | ERROR: "sun8i_tcon_top_of_table"
[drivers/gpu/drm/sun4i/sun4i-tcon.ko] undefined!

Build full log can be found on this link.,MACHINE=dragonboard-410c,label=docker-stretch-amd64/346/console

- Naresh

> Cheers
> Jon
> --
> nvpublic

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