diff options
Diffstat (limited to 'drivers/video/pwm_backlight.c')
| -rw-r--r-- | drivers/video/pwm_backlight.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/video/pwm_backlight.c b/drivers/video/pwm_backlight.c index 46c16a8f44..aa0e292866 100644 --- a/drivers/video/pwm_backlight.c +++ b/drivers/video/pwm_backlight.c @@ -14,6 +14,7 @@ #include <pwm.h> #include <asm/gpio.h> #include <linux/delay.h> +#include <linux/math64.h> #include <power/regulator.h> /** @@ -59,12 +60,14 @@ struct pwm_backlight_priv { static int set_pwm(struct pwm_backlight_priv *priv) { + u64 width; uint duty_cycle; int ret; if (priv->period_ns) { - duty_cycle = (u64)priv->period_ns * (priv->cur_level - priv->min_level) / - (priv->max_level - priv->min_level); + width = priv->period_ns * (priv->cur_level - priv->min_level); + duty_cycle = div_u64(width, + (priv->max_level - priv->min_level)); ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns, duty_cycle); } else { |