static int set_tod_write_overhead()

in ptp_clockmatrix.c [968:1010]

• 32 lines of code
• 5 McCabe index (conditional complexity)

static int set_tod_write_overhead(struct idtcm_channel *channel)
{
	struct idtcm *idtcm = channel->idtcm;
	s64 current_ns = 0;
	s64 lowest_ns = 0;
	int err;
	u8 i;
	ktime_t start;
	ktime_t stop;
	ktime_t diff;

	char buf[TOD_BYTE_COUNT] = {0};

	/* Set page offset */
	idtcm_write(idtcm, channel->hw_dpll_n, HW_DPLL_TOD_OVR__0,
		    buf, sizeof(buf));

	for (i = 0; i < TOD_WRITE_OVERHEAD_COUNT_MAX; i++) {
		start = ktime_get_raw();

		err = idtcm_write(idtcm, channel->hw_dpll_n,
				  HW_DPLL_TOD_OVR__0, buf, sizeof(buf));
		if (err)
			return err;

		stop = ktime_get_raw();

		diff = ktime_sub(stop, start);

		current_ns = ktime_to_ns(diff);

		if (i == 0) {
			lowest_ns = current_ns;
		} else {
			if (current_ns < lowest_ns)
				lowest_ns = current_ns;
		}
	}

	idtcm->tod_write_overhead_ns = lowest_ns;

	return err;
}