tree 2f97697392829b2687417916441b532473c338a5
parent 5e350b9260a2e94a9dd1b20fb720d855d5bf1034
author Roland Hii <roland.king.guan.hii@intel.com> 1452497658 +0800
committer Jeff Kirsher <jeffrey.t.kirsher@intel.com> 1456355933 -0800

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 <roland.king.guan.hii@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>