atmel_lcdfb: blank the backlight on remove

When removing atmel_lcdfb module, the backlight is unregistered but not
blanked. (only for CONFIG_BACKLIGHT_ATMEL_LCDC case).
This can result in the screen going full white depending on how the PWM
is wired.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index 6e6491fb83b7..effdb373b8db 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -223,8 +223,14 @@ static void init_backlight(struct atmel_lcdfb_info *sinfo)
 
 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 {
-        if (sinfo->backlight)
-                backlight_device_unregister(sinfo->backlight);
+        if (!sinfo->backlight)
+                return;
+
+        if (sinfo->backlight->ops) {
+                sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
+                sinfo->backlight->ops->update_status(sinfo->backlight);
+        }
+        backlight_device_unregister(sinfo->backlight);
 }
 
 #else