BXT_BLC_PWM_FREQ
intel_de_read(display, BXT_BLC_PWM_FREQ(panel->backlight.controller));
intel_de_read(display, BXT_BLC_PWM_FREQ(panel->backlight.controller));
intel_de_write(display, BXT_BLC_PWM_FREQ(panel->backlight.controller),
intel_de_write(display, BXT_BLC_PWM_FREQ(panel->backlight.controller),