diff options
Diffstat (limited to 'common/extpower_usb.c')
| -rw-r--r-- | common/extpower_usb.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/common/extpower_usb.c b/common/extpower_usb.c index 8b20d79145..4402ad697b 100644 --- a/common/extpower_usb.c +++ b/common/extpower_usb.c @@ -412,13 +412,18 @@ static int pwm_check_vbus_high(int vbus) static void pwm_nominal_duty_cycle(int percent) { int dummy; + int new_percent = percent; + new_percent += PWM_CTRL_BEGIN_OFFSET; + + /* + * If the battery is dead, leave a minimum amount of current + * input to sustain the system. + */ if (battery_current(&dummy)) - set_pwm_duty_cycle(percent); - else if (percent + PWM_CTRL_BEGIN_OFFSET > PWM_CTRL_MAX_DUTY) - set_pwm_duty_cycle(PWM_CTRL_MAX_DUTY); - else - set_pwm_duty_cycle(percent + PWM_CTRL_BEGIN_OFFSET); + new_percent = MIN(new_percent, PWM_CTRL_MAX_DUTY); + + set_pwm_duty_cycle(new_percent); nominal_pwm_duty = percent; pwm_fast_mode = 1; } |