net/mlx5: Query PPS pin operational status before registering it

In a special configuration, a ConnectX6-Dx pin pps-out might be activated
when driver is loaded. Fix the driver to always read the operational pin
mode when registering it, and advertise it accordingly.

Fixes: ee7f12205abc ("net/mlx5e: Implement 1PPS support")
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index 284806e..2d55b7c 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -452,6 +452,38 @@ static const struct ptp_clock_info mlx5_ptp_clock_info = {
        .verify         = NULL,
 };
 
+static int mlx5_query_mtpps_pin_mode(struct mlx5_core_dev *mdev, u8 pin,
+                                    u32 *mtpps, u32 mtpps_size)
+{
+       u32 in[MLX5_ST_SZ_DW(mtpps_reg)] = {};
+
+       MLX5_SET(mtpps_reg, in, pin, pin);
+
+       return mlx5_core_access_reg(mdev, in, sizeof(in), mtpps,
+                                   mtpps_size, MLX5_REG_MTPPS, 0, 0);
+}
+
+static int mlx5_get_pps_pin_mode(struct mlx5_clock *clock, u8 pin)
+{
+       struct mlx5_core_dev *mdev = clock->mdev;
+       u32 out[MLX5_ST_SZ_DW(mtpps_reg)] = {};
+       u8 mode;
+       int err;
+
+       err = mlx5_query_mtpps_pin_mode(mdev, pin, out, sizeof(out));
+       if (err || !MLX5_GET(mtpps_reg, out, enable))
+               return PTP_PF_NONE;
+
+       mode = MLX5_GET(mtpps_reg, out, pin_mode);
+
+       if (mode == MLX5_PIN_MODE_IN)
+               return PTP_PF_EXTTS;
+       else if (mode == MLX5_PIN_MODE_OUT)
+               return PTP_PF_PEROUT;
+
+       return PTP_PF_NONE;
+}
+
 static int mlx5_init_pin_config(struct mlx5_clock *clock)
 {
        int i;
@@ -471,7 +503,7 @@ static int mlx5_init_pin_config(struct mlx5_clock *clock)
                         sizeof(clock->ptp_info.pin_config[i].name),
                         "mlx5_pps%d", i);
                clock->ptp_info.pin_config[i].index = i;
-               clock->ptp_info.pin_config[i].func = PTP_PF_NONE;
+               clock->ptp_info.pin_config[i].func = mlx5_get_pps_pin_mode(clock, i);
                clock->ptp_info.pin_config[i].chan = 0;
        }