linux-kernel - Re: [PATCH v2 -next] drm/panel: Fix build error when CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20=y && CONFIG_DRM_DISPLAY

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Date:   Tue, 24 May 2022 12:34:52 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     gaochao <gaochao49@...wei.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, zhengbin13@...wei.com,
        Sean Paul <seanpaul@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v2 -next] drm/panel: Fix build error when
 CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20=y && CONFIG_DRM_DISPLAY_HELPER=m

Hi,

On Mon, May 23, 2022 at 7:46 PM gaochao <gaochao49@...wei.com> wrote:
>
> From: Gao Chao <gaochao49@...wei.com>
>
> If CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20=y && CONFIG_DRM_DISPLAY_HELPER=m,
> bulding fails:
>
> drivers/gpu/drm/panel/panel-samsung-atna33xc20.o: In function `atana33xc20_probe':
> panel-samsung-atna33xc20.c:(.text+0x744): undefined reference to
>  `drm_panel_dp_aux_backlight'
> make: *** [vmlinux] Error 1
>
> Let CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20 select DRM_DISPLAY_DP_HELPER and
> CONFIG_DRM_DISPLAY_HELPER to fix this error.
>
> Fixes: 32ce3b320343 ("drm/panel: atna33xc20: Introduce the Samsung ATNA33XC20 panel")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Gao Chao <gaochao49@...wei.com>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> ---
> v1->v2: fix Signed-off-by name
> ---
>  drivers/gpu/drm/panel/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)

The patch this is "fixing" is in mainline so theoretically this should
land in drm-misc-fixes, but it gets messy because it would need to be
adapted because commit 1e0f66420b13 ("drm/display: Introduce a DRM
display-helper module") isn't in mainline. Since this doesn't feel
urgent, I'm landing this in drm-misc/drm-misc-next.

a67664860f78 drm/panel: Fix build error when
CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20=y && CONFIG_DRM_DISPLAY_HELPER=m

-Doug