BXT_BLC_PWM_POLARITY
panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
pwm_ctl |= BXT_BLC_PWM_POLARITY;
pwm_ctl |= BXT_BLC_PWM_POLARITY;