[Intel-wired-lan] [PATCH iwl-net 2/2] ice: ptp: use primary NAC semaphore on E825

[Nowlin, Alexander]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces at osuosl.org> On Behalf Of Grzegorz Nitka
> Sent: Wednesday, April 22, 2026 5:32 AM
> To: intel-wired-lan at lists.osuosl.org
> Cc: netdev at vger.kernel.org; Kubalewski, Arkadiusz <arkadiusz.kubalewski at intel.com>; Nguyen, Anthony L <anthony.l.nguyen at intel.com>; Kitszel, Przemyslaw <przemyslaw.kitszel at intel.com>
> Subject: [Intel-wired-lan] [PATCH iwl-net 2/2] ice: ptp: use primary NAC semaphore on E825
> 
> For E825 2xNAC configurations, PTP semaphore operations must hit the primary NAC register block so both sides coordinate on the same lock.
> 
> Commit e2193f9f9ec9 ("ice: enable timesync operation on 2xNAC E825
> devices") updated other primary-only PTP register accesses to use the primary NAC on non-primary functions, but left ice_ptp_lock() and ice_ptp_unlock() operating on the local NAC. As a result, secondary NAC > PTP paths can take a different semaphore than the primary side.
> 
> Select the primary hardware in ice_ptp_lock() and ice_ptp_unlock() when the current function is not primary, keeping semaphore operations symmetric and consistent with the rest of the 2xNAC PTP register 
> access path.
> 
> Fixes: e2193f9f9ec9 ("ice: enable timesync operation on 2xNAC E825 devices")
> Reviewed-by: Arkadiusz Kubalewski <Arkadiusz.kubalewski at intel.com>
> Signed-off-by: Grzegorz Nitka <grzegorz.nitka at intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_ptp_hw.c | 9 +++++++++
> 1 file changed, 9 insertions(+)

Tested-by: Alexander Nowlin <alexander.nowlin at intel.com>