diff options
Diffstat (limited to 'drivers/video/backlight/pwm_bl.c')
| -rw-r--r-- | drivers/video/backlight/pwm_bl.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index bf7891552ee6..42a1af6aeba6 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -27,6 +27,7 @@ struct pwm_bl_data { unsigned int period; unsigned int lth_brightness; unsigned int *levels; + bool enabled; int (*notify)(struct device *, int brightness); void (*notify_after)(struct device *, @@ -40,6 +41,9 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness, { int duty_cycle, err; + if (pb->enabled) + return; + if (pb->levels) { duty_cycle = pb->levels[brightness]; max = pb->levels[max]; @@ -52,12 +56,18 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness, pwm_config(pb->pwm, duty_cycle, pb->period); pwm_enable(pb->pwm); + pb->enabled = true; } static void pwm_backlight_power_off(struct pwm_bl_data *pb) { + if (!pb->enabled) + return; + pwm_config(pb->pwm, 0, pb->period); pwm_disable(pb->pwm); + + pb->enabled = false; } static int pwm_backlight_update_status(struct backlight_device *bl) @@ -216,6 +226,7 @@ static int pwm_backlight_probe(struct platform_device *pdev) pb->check_fb = data->check_fb; pb->exit = data->exit; pb->dev = &pdev->dev; + pb->enabled = false; pb->pwm = devm_pwm_get(&pdev->dev, NULL); if (IS_ERR(pb->pwm)) { |