From: Li RongQing <redacted>

In mlx5_query_mtppse(), the result of mtppse_reg query should be read
from the output buffer 'out', not the input buffer 'in'. The function
currently reads event_arm and event_generation_mode from 'in', which
contains the uninitialized query parameters rather than the actual
register values.

Fix by reading from the correct buffer 'out'.

Fixes: f9a1ef720e9e ("net/mlx5: Add MTPPS and MTPPSE registers infrastructure")
Signed-off-by: Li RongQing <redacted>
---
 drivers/net/ethernet/mellanox/mlx5/core/port.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/port.c b/drivers/net/ethernet/mellanox/mlx5/core/port.c
index ee8b976..2ab6a6a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/port.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/port.c

@@ -921,8 +921,8 @@ int mlx5_query_mtppse(struct mlx5_core_dev *mdev, u8 pin, u8 *arm, u8 *mode)
 	if (err)
 		return err;
 
-	*arm = MLX5_GET(mtppse_reg, in, event_arm);
-	*mode = MLX5_GET(mtppse_reg, in, event_generation_mode);
+	*arm = MLX5_GET(mtppse_reg, out, event_arm);
+	*mode = MLX5_GET(mtppse_reg, out, event_generation_mode);
 
 	return err;
 }