[Intel-wired-lan] [PATCH iwl-net v2 1/4] igc: Ensure the PTM cycle is reliably triggered

[Avigail Dahan]

On 23/10/2024 5:30, Chris H wrote:
> From: Christopher S M Hall <christopher.s.hall at intel.com>
> 
> Writing to clear the PTM status 'valid' bit while the PTM cycle is
> triggered results in unreliable PTM operation. To fix this, clear the
> PTM 'trigger' and status after each PTM transaction.
> 
> The issue can be reproduced with the following:
> 
> $ sudo phc2sys -R 1000 -O 0 -i tsn0 -m
> 
> Note: 1000 Hz (-R 1000) is unrealistically large, but provides a way to
> quickly reproduce the issue.
> 
> PHC2SYS exits with:
> 
> "ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction
>    fails
> 
> Fixes: a90ec8483732 ("igc: Add support for PTP getcrosststamp()")
> Signed-off-by: Christopher S M Hall <christopher.s.hall at intel.com>
> Reviewed-by: Michal Swiatkowski <michal.swiatkowski at linux.intel.com>
> ---
>   drivers/net/ethernet/intel/igc/igc_defines.h |  1 +
>   drivers/net/ethernet/intel/igc/igc_ptp.c     | 70 ++++++++++++--------
>   2 files changed, 42 insertions(+), 29 deletions(-)
> 
Tested-by: Avigail Dahan <avigailx.dahan at intel.com>