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igb: fix PHC stopping on max freq

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For 82576 MAC type, max_adj is reported as 1000000000 ppb. However, if
this value is passed to igb_ptp_adjfreq_82576, incvalue overflows out of
INCVALUE_82576_MASK, resulting in setting of zero TIMINCA.incvalue, stopping
the PHC (instead of going at twice the nominal speed).

Fix the advertised max_adj value to the largest value hardware can handle.
As there is no min_adj value available (-max_adj is used instead), this will
also prevent stopping the clock intentionally. It's probably not a big deal,
other igb MAC types don't support stopping the clock, either.

Signed-off-by: Jiri Benc <[email protected]>
Acked-by: Matthew Vick <[email protected]>
Tested-by: Aaron Brown <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>
This commit is contained in:
Jiri Benc 2013-03-20 09:06:34 +00:00 • committed by Jeff Kirsher
commit 75517d9211
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/igb/igb_ptp.c
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@ -740,7 +740,7 @@ void igb_ptp_init(struct igb_adapter *adapter)
case e1000_82576:
snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
adapter->ptp_caps.owner = THIS_MODULE;
adapter->ptp_caps.max_adj = 1000000000;
adapter->ptp_caps.max_adj = 999999881;
adapter->ptp_caps.n_ext_ts = 0;
adapter->ptp_caps.pps = 0;
adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82576;