net/mlx5: Fix ptp max frequency adjustment range

[ Upstream commit fe91d57277eef8bb4aca05acfa337b4a51d0bba4 ]

.max_adj of ptp_clock_info acts as an absolute value for the amount in ppb
that can be set for a single call of .adjfine. This means that a single
call to .getfine cannot be greater than .max_adj or less than -(.max_adj).
Provides correct value for max frequency adjustment value supported by
devices.

Fixes: 2a62503c042f ("net/mlx5e: Add PTP Hardware Clock (PHC) support")
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index e0b361ff5a97f2b12dfaffa9eacaee6fc2e753b3..2c81ec31e0a2d42c511533c9fbe886902337bc45 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -418,7 +418,7 @@ static int mlx5_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
 static const struct ptp_clock_info mlx5_ptp_clock_info = {
        .owner          = THIS_MODULE,
        .name           = "mlx5_ptp",
-       .max_adj        = 100000000,
+       .max_adj        = 50000000,
        .n_alarm        = 0,
        .n_ext_ts       = 0,
        .n_per_out      = 0,