gma500: medfield: fix build without CONFIG_BACKLIGHT_CLASS_DEVICE

drivers/built-in.o: In function `mdfld_dsi_connector_set_property':
mdfld_dsi_output.c:(.text+0x6e909): undefined reference to `mdfld_set_brightness'
make: *** [.tmp_vmlinux1] Error 1

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_output.c b/drivers/gpu/drm/gma500/mdfld_dsi_output.c
index 4c2cb4a8ad9..5675d93b420 100644
--- a/drivers/gpu/drm/gma500/mdfld_dsi_output.c
+++ b/drivers/gpu/drm/gma500/mdfld_dsi_output.c
@@ -244,7 +244,6 @@ static int mdfld_dsi_connector_set_property(struct drm_connector *connector,
                                 uint64_t value)
 {
         struct drm_encoder *encoder = connector->encoder;
-        struct backlight_device *psb_bd;
 
         if (!strcmp(property->name, "scaling mode") && encoder) {
                 struct psb_intel_crtc *psb_crtc =
@@ -301,11 +300,15 @@ static int mdfld_dsi_connector_set_property(struct drm_connector *connector,
                                                                         value))
                         goto set_prop_error;
                 else {
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+                        struct backlight_device *psb_bd;
+
                         psb_bd = mdfld_get_backlight_device();
                         if (psb_bd) {
                                 psb_bd->props.brightness = value;
                                 mdfld_set_brightness(psb_bd);
                         }
+#endif
                 }
         }
 set_prop_done: