backlight: fix pwm_bl.c to notify platform code when suspending

When suspending, pwm-bl sets duty cycle to 0, and shuts down the pwm
device.

This patch ensure that the platform code is called before that
(through the notify callback_, leaving a chance for the platform code
to configure GPIOs (shutting off the backlight, for example), much like
it is done during normal operations.

Signed-off-by: Marc Zyngier <maz@misterjones.org>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index e641584e212e..887166267443 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -145,6 +145,8 @@ static int pwm_backlight_suspend(struct platform_device *pdev,
         struct backlight_device *bl = platform_get_drvdata(pdev);
         struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
 
+        if (pb->notify)
+                pb->notify(0);
         pwm_config(pb->pwm, 0, pb->period);
         pwm_disable(pb->pwm);
         return 0;