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backlight: lp855x: Don't clear level on suspend/blank 

Don't clear the backlight level when we're going into suspend or
blanking. Instead, just temporarily set the level to 0 so we retain
the value when we resume.

Reported-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Tested-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Acked-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Sean Paul 2015-05-11 13:32:05 -07:00 committed by Lee Jones
parent 0e441665bc
commit 61c1c6147f
1 changed files with 6 additions and 12 deletions
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18
drivers/video/backlight/lp855x_bl.c
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@ -257,21 +257,15 @@ static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
static int lp855x_bl_update_status(struct backlight_device *bl)
{
struct lp855x *lp = bl_get_data(bl);
int brightness = bl->props.brightness;
if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
bl->props.brightness = 0;
brightness = 0;
if (lp->mode == PWM_BASED) {
int br = bl->props.brightness;
int max_br = bl->props.max_brightness;
lp855x_pwm_ctrl(lp, br, max_br);
} else if (lp->mode == REGISTER_BASED) {
u8 val = bl->props.brightness;
lp855x_write_byte(lp, lp->cfg->reg_brightness, val);
}
if (lp->mode == PWM_BASED)
lp855x_pwm_ctrl(lp, brightness, bl->props.max_brightness);
else if (lp->mode == REGISTER_BASED)
lp855x_write_byte(lp, lp->cfg->reg_brightness, (u8)brightness);
return 0;
}