linux-kernel - [PATCH] drm/panel-edp: modify Kconfig to prevent build error

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Date:   Tue, 16 Nov 2021 22:27:04 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Douglas Anderson <dianders@...omium.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/panel-edp: modify Kconfig to prevent build error

When CONFIG_DRM_KMS_HELPER=m and CONFIG_DRM_PANEL_EDP=y,
there is a build error in gpu/drm/panel/panel-edp.o:

arm-linux-gnueabi-ld: drivers/gpu/drm/panel/panel-edp.o: in function `panel_edp_probe':
panel-edp.c:(.text+0xf38): undefined reference to `drm_panel_dp_aux_backlight'

Fix this by limiting DRM_PANEL_DEP by the value of the DRM_KMS_HELPER
symbol.

Fixes: 5f04e7ce392d ("drm/panel-edp: Split eDP panels out of panel-simple")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: kernel test robot <lkp@...el.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Javier Martinez Canillas <javierm@...hat.com>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Douglas Anderson <dianders@...omium.org>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Thierry Reding <thierry.reding@...il.com>
Cc: dri-devel@...ts.freedesktop.org
---
 drivers/gpu/drm/panel/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20211117.orig/drivers/gpu/drm/panel/Kconfig
+++ linux-next-20211117/drivers/gpu/drm/panel/Kconfig
@@ -104,6 +104,7 @@ config DRM_PANEL_EDP
 	depends on OF
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on PM
+	depends on DRM_KMS_HELPER
 	select VIDEOMODE_HELPERS
 	select DRM_DP_AUX_BUS
 	help