diff options
| author | Vinicius Costa Gomes <vinicius.gomes@intel.com> | 2020-08-21 02:02:16 +0300 |
|---|---|---|
| committer | Tony Nguyen <anthony.l.nguyen@intel.com> | 2020-09-29 00:42:45 +0300 |
| commit | e5f020ad610b11827914245048ec55a7bb030944 (patch) | |
| tree | 56157aa2127db9a620cc0022937bd6be72f6790d | |
| parent | 40edc73469a17d247a79034acb07ec280fda6494 (diff) | |
| download | linux-e5f020ad610b11827914245048ec55a7bb030944.tar.xz | |
igc: Remove references to SYSTIMR register
In i225, it's no longer necessary to use the SYSTIMR register to
latch the timer value, the timestamp is latched when SYSTIML is read.
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
| -rw-r--r-- | drivers/net/ethernet/intel/igc/igc_ptp.c | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c index 61852c99815d..0300b45b36e2 100644 --- a/drivers/net/ethernet/intel/igc/igc_ptp.c +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c @@ -22,11 +22,7 @@ static void igc_ptp_read_i225(struct igc_adapter *adapter, struct igc_hw *hw = &adapter->hw; u32 sec, nsec; - /* The timestamp latches on lowest register read. For I210/I211, the - * lowest register is SYSTIMR. Since we only need to provide nanosecond - * resolution, we can ignore it. - */ - rd32(IGC_SYSTIMR); + /* The timestamp is latched when SYSTIML is read. */ nsec = rd32(IGC_SYSTIML); sec = rd32(IGC_SYSTIMH); @@ -39,9 +35,6 @@ static void igc_ptp_write_i225(struct igc_adapter *adapter, { struct igc_hw *hw = &adapter->hw; - /* Writing the SYSTIMR register is not necessary as it only - * provides sub-nanosecond resolution. - */ wr32(IGC_SYSTIML, ts->tv_nsec); wr32(IGC_SYSTIMH, ts->tv_sec); } @@ -102,10 +95,9 @@ static int igc_ptp_gettimex64_i225(struct ptp_clock_info *ptp, spin_lock_irqsave(&igc->tmreg_lock, flags); ptp_read_system_prets(sts); - rd32(IGC_SYSTIMR); - ptp_read_system_postts(sts); ts->tv_nsec = rd32(IGC_SYSTIML); ts->tv_sec = rd32(IGC_SYSTIMH); + ptp_read_system_postts(sts); spin_unlock_irqrestore(&igc->tmreg_lock, flags); |