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Commit 1dea1fd0 authored by Huayi Li's avatar Huayi Li Committed by Thierry Reding
Browse files

pwm_backlight: avoid short blank screen while doing hibernation 



Use SIMPLE_DEV_PM_OPS macro will initialize the member "freeze"
and "thaw" of pwm_backlight_pm_ops as below,
	.freeze = suspend_fn,
	.thaw = resume_fn,
then during the process of making hibernation snapshot, screen
will be blank at the moment of freezing, and then light at the
moment of thawing.
this is not the right user experience for suspending to disk.

so this patch drops freeze and thaw callback, make the LCD is
always lighting before the final shutdown.

Signed-off-by: default avatarHuayi Li <huayi.li@csr.com>
Signed-off-by: default avatarBarry Song <Baohua.Song@csr.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent e4bfeda9

drivers/video/backlight/pwm_bl.c

+8 −2
Original line number Diff line number Diff line
@@ -387,8 +387,14 @@ static int pwm_backlight_resume(struct device *dev) 
}

#endif



static SIMPLE_DEV_PM_OPS(pwm_backlight_pm_ops, pwm_backlight_suspend,

			 pwm_backlight_resume);

static const struct dev_pm_ops pwm_backlight_pm_ops = {

#ifdef CONFIG_PM_SLEEP

	.suspend = pwm_backlight_suspend,

	.resume = pwm_backlight_resume,

	.poweroff = pwm_backlight_suspend,

	.restore = pwm_backlight_resume,

#endif

};



static struct platform_driver pwm_backlight_driver = {

	.driver		= {