Re: [PATCHv3] pwm_backlight: pass correct brightness to callback
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From: Thierry Reding <hidden>
Date: 2012-07-09 06:30:12
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On Mon, Jul 09, 2012 at 03:04:23PM +0900, Alexandre Courbot wrote:
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 <acourbot@nvidia.com> --- drivers/video/backlight/pwm_bl.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
Applied, with a minor stylistic fixup adding a blank line after the duty_cycle variable declaration. Thanks. Thierry
quoted hunk ↗ jump to hunk
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 057389d..be48517 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c@@ -54,14 +54,17 @@ 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); }-- 1.7.11.1
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