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| author | Nikhil Gupta <nikhil.gupta@nxp.com> | 2023-01-19 23:40:34 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-01-21 05:20:38 +0300 |
| commit | 24a7fffb2533bb44d4ec84bb824732a9c4882f15 (patch) | |
| tree | 8ff5538f62c7458541978bb47a7f4d424a41337b /net/tipc | |
| parent | 5e64f59a3cc2c4cfba748b87f0761d865dec7924 (diff) | |
| download | linux-24a7fffb2533bb44d4ec84bb824732a9c4882f15.tar.xz | |
ptp_qoriq: fix latency in ptp_qoriq_adjtime() operation
1588 driver loses about 1us in adjtime operation at PTP slave
This is because adjtime operation uses a slow non-atomic tmr_cnt_read()
followed by tmr_cnt_write() operation.
In the above sequence, since the timer counter operation keeps
incrementing, it leads to latency. The tmr_offset register
(which is added to TMR_CNT_H/L register giving the current time)
must be programmed with the delta nanoseconds.
Signed-off-by: Nikhil Gupta <nikhil.gupta@nxp.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20230119204034.7969-1-nikhil.gupta@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/tipc')
0 files changed, 0 insertions, 0 deletions