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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Sasha Levin <alexander.levin@verizon.com>
Subject: [PATCH 4.14 113/156] drm/omap: displays: panel-dpi: add backlight dependency
Date:   Fri,  2 Feb 2018 17:58:14 +0100
Message-Id: <20180202140845.289730292@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@arndb.de>


[ Upstream commit 499ec0ed5eb2f6a7fcaab2dd66ffc5993484bda9 ]

The new backlight code causes a link failure when backlight
support itself is disabled:

drivers/gpu/drm/omapdrm/displays/panel-dpi.o: In function `panel_dpi_probe_of':
panel-dpi.c:(.text+0x35c): undefined reference to `of_find_backlight_by_node'

This adds a Kconfig dependency like we have for the other OMAP
display targets.

Fixes: 39135a305a0f ("drm/omap: displays: panel-dpi: Support for handling backlight devices")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/omapdrm/displays/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/omapdrm/displays/Kconfig
+++ b/drivers/gpu/drm/omapdrm/displays/Kconfig
@@ -35,6 +35,7 @@ config DRM_OMAP_CONNECTOR_ANALOG_TV
 
 config DRM_OMAP_PANEL_DPI
 	tristate "Generic DPI panel"
+	depends on BACKLIGHT_CLASS_DEVICE
 	help
 	  Driver for generic DPI panels.