drivers/video/backlight/ams369fg06.c: make power_on() call optional

This patch makes power_on() call optional.  The voltage source can be
provided to some boards using ams369fg06 panel, thus in this case, power
on/off sequence is not necessary.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/video/backlight/ams369fg06.c b/drivers/video/backlight/ams369fg06.c
index d29e49443f29..c02aa2c2575a 100644
--- a/drivers/video/backlight/ams369fg06.c
+++ b/drivers/video/backlight/ams369fg06.c
@@ -317,10 +317,7 @@ static int ams369fg06_power_on(struct ams369fg06 *lcd)
         pd = lcd->lcd_pd;
         bd = lcd->bd;
 
-        if (!pd->power_on) {
-                dev_err(lcd->dev, "power_on is NULL.\n");
-                return -EINVAL;
-        } else {
+        if (pd->power_on) {
                 pd->power_on(lcd->ld, 1);
                 msleep(pd->power_on_delay);
         }
@@ -370,7 +367,8 @@ static int ams369fg06_power_off(struct ams369fg06 *lcd)
 
         msleep(pd->power_off_delay);
 
-        pd->power_on(lcd->ld, 0);
+        if (pd->power_on)
+                pd->power_on(lcd->ld, 0);
 
         return 0;
 }