82580 NICs have a hardware bug that makes it
necessary to write into the TSICR (TimeSync Interrupt Cause) register
to clear it:
https://lore.kernel.org/all/cdcb8be0.1ec2c%25matthew.v...@intel.com/
Add a conditional so only for 82580 we write into the TSICR register,
so we don't risk losing events for other models.
This (partially) reverts commit ee14cc9ea19b ("igb: Fix missing time sync
events").
Fixes: ee14cc9ea19b ("igb: Fix missing time sync events")
Closes:
https://lore.kernel.org/intel-wired-lan/CAN0jFd1kO0MMtOh8N2Ztxn6f7vvDKp2h507sMryobkBKe=xk=w...@mail.gmail.com/
Tested-by: Daiwei Li <daiwe...@google.com>
Signed-off-by: Daiwei Li <daiwe...@google.com>
---
@Vinicius Gomes, this is my first time submitting a Linux kernel patch,
so apologies if I missed any part of the procedure (e.g. this is
currently on top of 6.7.12, the kernel I am running; should I be
rebasing on inline?). Also, is there any way to annotate the patch
to give you credit for the original change?
drivers/net/ethernet/intel/igb/igb_main.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
b/drivers/net/ethernet/intel/igb/igb_main.c
index ada42ba63549..1210ddc5d81e 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -6986,6 +6986,16 @@ static void igb_tsync_interrupt(struct igb_adapter
*adapter)
struct e1000_hw *hw = &adapter->hw;
u32 tsicr = rd32(E1000_TSICR);
struct ptp_clock_event event;
+ const u32 mask = (TSINTR_SYS_WRAP | E1000_TSICR_TXTS |
+ TSINTR_TT0 | TSINTR_TT1 |
+ TSINTR_AUTT0 | TSINTR_AUTT1);
+
+ if (hw->mac.type == e1000_82580) {
+ /* 82580 has a hardware bug that requires a explicit
+ * write to clear the TimeSync interrupt cause.
+ */
+ wr32(E1000_TSICR, tsicr & mask);
+ }
if (tsicr & TSINTR_SYS_WRAP) {
event.type = PTP_CLOCK_PPS;
--
2.46.0.76.ge559c4bf1a-goog
