From 569f3b3d4e9898ae30788fde128e3277d996710e Mon Sep 17 00:00:00 2001 From: Roland Hii Date: Mon, 11 Jan 2016 15:34:18 +0800 Subject: igb: add conditions for I210 to generate periodic clock output In general case the maximum supported half cycle time of the synchronized output clock is 70msec. Slower half cycle time than 70msec can be programmed also as long as the output clock is synchronized to whole seconds, useful specifically for generating a 1Hz clock. Permitted values for the clock half cycle time are: 125,000,000 decimal, 250,000,000 decimal and 500,000,000 decimal (equals to 125msec, 250msec and 500msec respectively). Before this patch, only the half cycle time of less than or equal to 70msec uses the I210 clock output function. This patch adds additional conditions when half cycle time is equal to 125msec or 250msec or 500msec to use clock output function. Under other conditions, interrupt driven target time output events method is still used to generate the desired clock output. Signed-off-by: Roland Hii Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/igb/igb_ptp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/net/ethernet') diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c index c44df87c38de..22a8a29895b4 100644 --- a/drivers/net/ethernet/intel/igb/igb_ptp.c +++ b/drivers/net/ethernet/intel/igb/igb_ptp.c @@ -525,7 +525,8 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp, ts.tv_nsec = rq->perout.period.nsec; ns = timespec64_to_ns(&ts); ns = ns >> 1; - if (on && ns <= 70000000LL) { + if (on && ((ns <= 70000000LL) || (ns == 125000000LL) || + (ns == 250000000LL) || (ns == 500000000LL))) { if (ns < 8LL) return -EINVAL; use_freq = 1; -- cgit v1.2.3-59-g8ed1b