1 files changed, 51 insertions, 27 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index 0c83ef174275..0361741632a6 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -266,9 +266,6 @@ static int mlx5_ptp_settime_real_time(struct mlx5_core_dev *mdev,
 {
 	u32 in[MLX5_ST_SZ_DW(mtutc_reg)] = {};
 
-	if (!mlx5_modify_mtutc_allowed(mdev))
-		return 0;
-
 	if (ts->tv_sec < 0 || ts->tv_sec > U32_MAX ||
 	    ts->tv_nsec < 0 || ts->tv_nsec > NSEC_PER_SEC)
 		return -EINVAL;
@@ -286,12 +283,15 @@ static int mlx5_ptp_settime(struct ptp_clock_info *ptp, const struct timespec64
 	struct mlx5_timer *timer = &clock->timer;
 	struct mlx5_core_dev *mdev;
 	unsigned long flags;
-	int err;
 
 	mdev = container_of(clock, struct mlx5_core_dev, clock);
-	err = mlx5_ptp_settime_real_time(mdev, ts);
-	if (err)
-		return err;
+
+	if (mlx5_modify_mtutc_allowed(mdev)) {
+		int err = mlx5_ptp_settime_real_time(mdev, ts);
+
+		if (err)
+			return err;
+	}
 
 	write_seqlock_irqsave(&clock->lock, flags);
 	timecounter_init(&timer->tc, &timer->cycles, timespec64_to_ns(ts));
@@ -341,9 +341,6 @@ static int mlx5_ptp_adjtime_real_time(struct mlx5_core_dev *mdev, s64 delta)
 {
 	u32 in[MLX5_ST_SZ_DW(mtutc_reg)] = {};
 
-	if (!mlx5_modify_mtutc_allowed(mdev))
-		return 0;
-
 	/* HW time adjustment range is checked. If out of range, settime instead */
 	if (!mlx5_is_mtutc_time_adj_cap(mdev, delta)) {
 		struct timespec64 ts;
@@ -367,13 +364,16 @@ static int mlx5_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
 	struct mlx5_timer *timer = &clock->timer;
 	struct mlx5_core_dev *mdev;
 	unsigned long flags;
-	int err;
 
 	mdev = container_of(clock, struct mlx5_core_dev, clock);
 
-	err = mlx5_ptp_adjtime_real_time(mdev, delta);
-	if (err)
-		return err;
+	if (mlx5_modify_mtutc_allowed(mdev)) {
+		int err = mlx5_ptp_adjtime_real_time(mdev, delta);
+
+		if (err)
+			return err;
+	}
+
 	write_seqlock_irqsave(&clock->lock, flags);
 	timecounter_adjtime(&timer->tc, delta);
 	mlx5_update_clock_info_page(mdev);
@@ -396,15 +396,14 @@ static int mlx5_ptp_freq_adj_real_time(struct mlx5_core_dev *mdev, long scaled_p
 {
 	u32 in[MLX5_ST_SZ_DW(mtutc_reg)] = {};
 
-	if (!mlx5_modify_mtutc_allowed(mdev))
-		return 0;
-
 	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));
@@ -420,13 +419,15 @@ static int mlx5_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 	struct mlx5_core_dev *mdev;
 	unsigned long flags;
 	u32 mult;
-	int err;
 
 	mdev = container_of(clock, struct mlx5_core_dev, clock);
 
-	err = mlx5_ptp_freq_adj_real_time(mdev, scaled_ppm);
-	if (err)
-		return err;
+	if (mlx5_modify_mtutc_allowed(mdev)) {
+		int err = mlx5_ptp_freq_adj_real_time(mdev, scaled_ppm);
+
+		if (err)
+			return err;
+	}
 
 	mult = (u32)adjust_by_scaled_ppm(timer->nominal_c_mult, scaled_ppm);
 
@@ -1004,14 +1005,38 @@ static void mlx5_init_clock_info(struct mlx5_core_dev *mdev)
 	info->frac = timer->tc.frac;
 }
 
+static void mlx5_init_timer_max_freq_adjustment(struct mlx5_core_dev *mdev)
+{
+	struct mlx5_clock *clock = &mdev->clock;
+	u32 out[MLX5_ST_SZ_DW(mtutc_reg)] = {};
+	u32 in[MLX5_ST_SZ_DW(mtutc_reg)] = {};
+	u8 log_max_freq_adjustment = 0;
+	int err;
+
+	err = mlx5_core_access_reg(mdev, in, sizeof(in), out, sizeof(out),
+				   MLX5_REG_MTUTC, 0, 0);
+	if (!err)
+		log_max_freq_adjustment =
+			MLX5_GET(mtutc_reg, out, log_max_freq_adjustment);
+
+	if (log_max_freq_adjustment)
+		clock->ptp_info.max_adj =
+			min(S32_MAX, 1 << log_max_freq_adjustment);
+}
+
 static void mlx5_init_timer_clock(struct mlx5_core_dev *mdev)
 {
 	struct mlx5_clock *clock = &mdev->clock;
 
+	/* Configure the PHC */
+	clock->ptp_info = mlx5_ptp_clock_info;
+
+	if (MLX5_CAP_MCAM_REG(mdev, mtutc))
+		mlx5_init_timer_max_freq_adjustment(mdev);
+
 	mlx5_timecounter_init(mdev);
 	mlx5_init_clock_info(mdev);
 	mlx5_init_overflow_period(clock);
-	clock->ptp_info = mlx5_ptp_clock_info;
 
 	if (mlx5_real_time_mode(mdev)) {
 		struct timespec64 ts;
@@ -1042,11 +1067,10 @@ void mlx5_init_clock(struct mlx5_core_dev *mdev)
 	}
 
 	seqlock_init(&clock->lock);
-	mlx5_init_timer_clock(mdev);
 	INIT_WORK(&clock->pps_info.out_work, mlx5_pps_out);
 
-	/* Configure the PHC */
-	clock->ptp_info = mlx5_ptp_clock_info;
+	/* Initialize the device clock */
+	mlx5_init_timer_clock(mdev);
 
 	/* Initialize 1PPS data structures */
 	mlx5_init_pps(mdev);