1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 9bd17682655a..1c2289ddd555 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -79,14 +79,17 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb)
 static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)
 {
         unsigned int lth = pb->lth_brightness;
-        int duty_cycle;
+        u64 duty_cycle;
 
         if (pb->levels)
                 duty_cycle = pb->levels[brightness];
         else
                 duty_cycle = brightness;
 
-        return (duty_cycle * (pb->period - lth) / pb->scale) + lth;
+        duty_cycle *= pb->period - lth;
+        do_div(duty_cycle, pb->scale);
+
+        return duty_cycle + lth;
 }
 
 static int pwm_backlight_update_status(struct backlight_device *bl)