Commit 78c1b267 authored by Rahul Rameshbabu's avatar Rahul Rameshbabu Committed by Saeed Mahameed
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net/mlx5: Convert scaled ppm values outside the s32 range for PHC frequency adjustments 



Represent scaled ppm as ppb to the device when the value in scaled ppm is
not representable as a 32-bit signed integer. mlx5 devices only support a
32-bit field for the frequency adjustment value in units of either scaled
ppm or ppb.

Since mlx5 devices only support a 32-bit field for the frequency adjustment
value independent of unit used, limit the maximum frequency adjustment to
S32_MAX ppb.

Signed-off-by: default avatarRahul Rameshbabu <rrameshbabu@nvidia.com>
Reviewed-by: default avatarTariq Toukan <tariqt@nvidia.com>
Signed-off-by: default avatarSaeed Mahameed <saeedm@nvidia.com>
parent 4395d9de

drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c

+4 −2
Original line number Diff line number Diff line
@@ -393,10 +393,12 @@ static int mlx5_ptp_freq_adj_real_time(struct mlx5_core_dev *mdev, long scaled_p 


	MLX5_SET(mtutc_reg, in, operation, MLX5_MTUTC_OPERATION_ADJUST_FREQ_UTC);



	if (MLX5_CAP_MCAM_FEATURE(mdev, mtutc_freq_adj_units)) {

	if (MLX5_CAP_MCAM_FEATURE(mdev, mtutc_freq_adj_units) &&

	    scaled_ppm <= S32_MAX && scaled_ppm >= S32_MIN) {

		/* HW scaled_ppm support on mlx5 devices only supports a 32-bit value */

		MLX5_SET(mtutc_reg, in, freq_adj_units,

			 MLX5_MTUTC_FREQ_ADJ_UNITS_SCALED_PPM);

		MLX5_SET(mtutc_reg, in, freq_adjustment, scaled_ppm);

		MLX5_SET(mtutc_reg, in, freq_adjustment, (s32)scaled_ppm);

	} else {

		MLX5_SET(mtutc_reg, in, freq_adj_units, MLX5_MTUTC_FREQ_ADJ_UNITS_PPB);

		MLX5_SET(mtutc_reg, in, freq_adjustment, scaled_ppm_to_ppb(scaled_ppm));