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igb: Fix missing time sync events

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Fix "double" clearing of interrupts, which can cause external events
or timestamps to be missed.

The E1000_TSIRC Time Sync Interrupt Cause register can be cleared in two
ways, by either reading it or by writing '1' into the specific cause
bit. This is documented in section 8.16.1.

The following flow was used:
    1. read E1000_TSIRC into 'tsicr';
    2. handle the interrupts present into 'tsirc' and mark them in 'ack';
    3. write 'ack' into E1000_TSICR;

As both (1) and (3) will clear the interrupt cause, if the same
interrupt happens again between (1) and (3) it will be ignored,
causing events to be missed.

Remove the extra clear in (3).

Fixes: 00c65578b4 ("igb: enable internal PPS for the i210")
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Vinicius Costa Gomes 2024-02-20 15:57:11 -08:00 committed by Tony Nguyen
parent 244ae992e3
commit ee14cc9ea1
1 changed files with 5 additions and 18 deletions
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23
drivers/net/ethernet/intel/igb/igb_main.c
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@ -6985,44 +6985,31 @@ static void igb_extts(struct igb_adapter *adapter, int tsintr_tt)
static void igb_tsync_interrupt(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
u32 ack = 0, tsicr = rd32(E1000_TSICR);
u32 tsicr = rd32(E1000_TSICR);
struct ptp_clock_event event;
if (tsicr & TSINTR_SYS_WRAP) {
event.type = PTP_CLOCK_PPS;
if (adapter->ptp_caps.pps)
ptp_clock_event(adapter->ptp_clock, &event);
ack |= TSINTR_SYS_WRAP;
}
if (tsicr & E1000_TSICR_TXTS) {
/* retrieve hardware timestamp */
schedule_work(&adapter->ptp_tx_work);
ack |= E1000_TSICR_TXTS;
}
if (tsicr & TSINTR_TT0) {
if (tsicr & TSINTR_TT0)
igb_perout(adapter, 0);
ack |= TSINTR_TT0;
}
if (tsicr & TSINTR_TT1) {
if (tsicr & TSINTR_TT1)
igb_perout(adapter, 1);
ack |= TSINTR_TT1;
}
if (tsicr & TSINTR_AUTT0) {
if (tsicr & TSINTR_AUTT0)
igb_extts(adapter, 0);
ack |= TSINTR_AUTT0;
}
if (tsicr & TSINTR_AUTT1) {
if (tsicr & TSINTR_AUTT1)
igb_extts(adapter, 1);
ack |= TSINTR_AUTT1;
}
/* acknowledge the interrupts */
wr32(E1000_TSICR, ack);
}
static irqreturn_t igb_msix_other(int irq, void *data)