tcmp = duty_ns / tin_ns;
tcmp = tcnt - tcmp;
+ /* the pwm hw only checks the compare register after a decrement,
+ so the pin never toggles if tcmp = tcnt */
+ if (tcmp == tcnt)
+ tcmp--;
pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);