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igc: Remove references to SYSTIMR register

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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>
This commit is contained in:
Vinicius Costa Gomes 2020-08-20 16:02:16 -07:00 committed by Tony Nguyen
parent 40edc73469
commit e5f020ad61
1 changed files with 2 additions and 10 deletions
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12
drivers/net/ethernet/intel/igc/igc_ptp.c
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@ -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);