linux-kernel - Re: [PATCH v2] drm/panel: Select DRM_DP_HELPER for DRM_PANEL

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Date:   Mon, 7 Feb 2022 16:43:47 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     thierry.reding@...il.com, sam@...nborg.org, airlied@...ux.ie,
        daniel@...ll.ch, lyude@...hat.com, linus.walleij@...aro.org,
        dianders@...omium.org, ardb@...nel.org, rdunlap@...radead.org,
        arnd@...db.de, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Linux Kernel Functional Testing <lkft@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>
Subject: Re: [PATCH v2] drm/panel: Select DRM_DP_HELPER for DRM_PANEL_EDP

Hi Thomas,

On Thu, 3 Feb 2022 at 15:09, Thomas Zimmermann <tzimmermann@...e.de> wrote:
>
> As reported in [1], DRM_PANEL_EDP depends on DRM_DP_HELPER. Select
> the option to fix the build failure. The error message is shown
> below.
>
>   arm-linux-gnueabihf-ld: drivers/gpu/drm/panel/panel-edp.o: in function
>     `panel_edp_probe': panel-edp.c:(.text+0xb74): undefined reference to
>     `drm_panel_dp_aux_backlight'
>   make[1]: *** [/builds/linux/Makefile:1222: vmlinux] Error 1
>
> The issue has been reported before, when DisplayPort helpers were
> hidden behind the option CONFIG_DRM_KMS_HELPER. [2]
>
> v2:
>         * fix and expand commit description (Arnd)
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
> Fixes: adb9d5a2cc77 ("drm/dp: Move DisplayPort helpers into separate helper module")
> Fixes: 5f04e7ce392d ("drm/panel-edp: Split eDP panels out of panel-simple")
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Link: https://lore.kernel.org/dri-devel/CA+G9fYvN0NyaVkRQmA1O6rX7H8PPaZrUAD7=RDy33QY9rUU-9g@mail.gmail.com/ # [1]
> Link: https://lore.kernel.org/all/20211117062704.14671-1-rdunlap@infradead.org/ # [2]
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: Lyude Paul <lyude@...hat.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> Cc: Maxime Ripard <mripard@...nel.org>
> Cc: dri-devel@...ts.freedesktop.org

Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Tested-by: Linux Kernel Functional Testing <lkft@...aro.org>

This patch fixes the repored build problem.


> ---
>  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..0aec5a10b064 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -106,6 +106,7 @@ config DRM_PANEL_EDP
>         depends on PM
>         select VIDEOMODE_HELPERS
>         select DRM_DP_AUX_BUS
> +       select DRM_DP_HELPER
>         help
>           DRM panel driver for dumb eDP panels that need at most a regulator and
>           a GPIO to be powered up. Optionally a backlight can be attached so
> --
> 2.34.1
>


-- 
Linaro LKFT
https://lkft.linaro.org