diff options
| author | Jacob Keller <jacob.e.keller@intel.com> | 2022-11-14 13:37:01 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-11-16 12:17:44 -0800 |
| commit | d82303df06481235fe7cbaf605075e0c2c87e99b (patch) | |
| tree | b5e0b633e483c3734cdb0d52395a04d590cf86b3 /drivers | |
| parent | bf36267e3ad3df80a3a18eb0422723069a434934 (diff) | |
mlxsw: update adjfine to use adjust_by_scaled_ppm
The mlxsw adjfine implementation in the spectrum_ptp.c file converts
scaled_ppm into ppb before updating a cyclecounter multiplier using the
standard "base * ppb / 1billion" calculation.
This can be re-written to use adjust_by_scaled_ppm, directly using the
scaled parts per million and reducing the amount of code required to
express this calculation.
We still calculate the parts per billion for passing into
mlxsw_sp_ptp_phc_adjfreq because this function requires the input to be in
parts per billion.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Cc: Amit Cohen <amcohen@nvidia.com>
Cc: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/20221114213701.815132-1-jacob.e.keller@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c | 18 |
1 files changed, 3 insertions, 15 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c index 7b01b9c20722..cbb6c75a6620 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c @@ -189,29 +189,17 @@ mlxsw_sp1_ptp_phc_settime(struct mlxsw_sp1_ptp_clock *clock, u64 nsec) static int mlxsw_sp1_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) { struct mlxsw_sp1_ptp_clock *clock = mlxsw_sp1_ptp_clock(ptp); - int neg_adj = 0; - u32 diff; - u64 adj; s32 ppb; ppb = scaled_ppm_to_ppb(scaled_ppm); - if (ppb < 0) { - neg_adj = 1; - ppb = -ppb; - } - - adj = clock->nominal_c_mult; - adj *= ppb; - diff = div_u64(adj, NSEC_PER_SEC); - spin_lock_bh(&clock->lock); timecounter_read(&clock->tc); - clock->cycles.mult = neg_adj ? clock->nominal_c_mult - diff : - clock->nominal_c_mult + diff; + clock->cycles.mult = adjust_by_scaled_ppm(clock->nominal_c_mult, + scaled_ppm); spin_unlock_bh(&clock->lock); - return mlxsw_sp_ptp_phc_adjfreq(&clock->common, neg_adj ? -ppb : ppb); + return mlxsw_sp_ptp_phc_adjfreq(&clock->common, ppb); } static int mlxsw_sp1_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) |