Commit cafa1fca authored by Jacob Keller's avatar Jacob Keller Committed by David S. Miller

i40e: fix Timesync Tx interrupt handler code

This patch fixes the PTP Tx timestamp interrupt handler. The original
code misinterpreted the interrupt handler design. We were clearing the
ena_mask bit for the Timesync interrupts. This is done to indicate that
the interrupt will be handled in a scheduled work item (instead of
immediately) and that work item is responsible for re-enabling the
interrupts. However, the Tx timestamp was being handled immediately and
nothing was ever re-enabling it. This resulted in a single interrupt
working for the life of the driver.

This patch fixes the issue by instead clearing the bit from icr0 which
is used to indicate that the interrupt was immediately handled and can
be re-enabled right away. This patch also clears up a related issue due
to writing the PRTTSYN_STAT_0 register, which was unintentionally
clearing the cause bits for Timesync interrupts.

Change-ID: I057bd70d53c302f60fab78246989cbdfa469d83b
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Acked-by: default avatarAnjali Singhai Jain <anjali.singhai@intel.com>
Acked-by: default avatarShannon Nelson <shannon.nelson@intel.com>
Tested-by: default avatarKavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 69d268b7
......@@ -2897,12 +2897,9 @@ static irqreturn_t i40e_intr(int irq, void *data)
u32 prttsyn_stat = rd32(hw, I40E_PRTTSYN_STAT_0);
if (prttsyn_stat & I40E_PRTTSYN_STAT_0_TXTIME_MASK) {
ena_mask &= ~I40E_PFINT_ICR0_ENA_TIMESYNC_MASK;
icr0 &= ~I40E_PFINT_ICR0_ENA_TIMESYNC_MASK;
i40e_ptp_tx_hwtstamp(pf);
prttsyn_stat &= ~I40E_PRTTSYN_STAT_0_TXTIME_MASK;
}
wr32(hw, I40E_PRTTSYN_STAT_0, prttsyn_stat);
}
/* If a critical error is pending we have no choice but to reset the
......
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