From 9fb978b12f9cc2b4df428764273d96877d0a262d Mon Sep 17 00:00:00 2001 From: Alexandre Courbot Date: Mon, 9 Jul 2012 15:04:23 +0900 Subject: [PATCH] pwm_backlight: pass correct brightness to callback pwm_backlight_update_status calls the notify() and notify_after() callbacks before and after applying the new PWM settings. However, if brightness levels are used, the brightness value will be changed from the index into the levels array to the PWM duty cycle length before being passed to notify_after(), which results in inconsistent behavior. Signed-off-by: Alexandre Courbot Signed-off-by: Thierry Reding --- drivers/video/backlight/pwm_bl.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 057389d69a51..995f0164c9b0 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -54,14 +54,18 @@ static int pwm_backlight_update_status(struct backlight_device *bl) pwm_config(pb->pwm, 0, pb->period); pwm_disable(pb->pwm); } else { + int duty_cycle; + if (pb->levels) { - brightness = pb->levels[brightness]; + duty_cycle = pb->levels[brightness]; max = pb->levels[max]; + } else { + duty_cycle = brightness; } - brightness = pb->lth_brightness + - (brightness * (pb->period - pb->lth_brightness) / max); - pwm_config(pb->pwm, brightness, pb->period); + duty_cycle = pb->lth_brightness + + (duty_cycle * (pb->period - pb->lth_brightness) / max); + pwm_config(pb->pwm, duty_cycle, pb->period); pwm_enable(pb->pwm); } -- 2.20.1