linux-kernel - [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 10:45:51 +0800
From:   gaochao <gaochao49@...wei.com>
To:     <thierry.reding@...il.com>, <sam@...nborg.org>, <airlied@...ux.ie>,
        <daniel@...ll.ch>, <dianders@...omium.org>
CC:     <seanpaul@...omium.org>, <zhengbin13@...wei.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 -next] drm/panel: Fix build error when CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20=y && CONFIG_DRM_DISPLAY_HELPER=m

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(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 38799effd00a..4f1f004b3c54 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -438,6 +438,8 @@ config DRM_PANEL_SAMSUNG_ATNA33XC20
 	depends on OF
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on PM
+	select DRM_DISPLAY_DP_HELPER
+	select DRM_DISPLAY_HELPER
 	select DRM_DP_AUX_BUS
 	help
 	  DRM panel driver for the Samsung ATNA33XC20 panel. This panel can't
--
2.17.1