[PATCH 5.4 49/90] net/mlx5: Verify Hardware supports requested ptp function on a given pin

[Greg Kroah-Hartman]

From: Eran Ben Elisha <era...@mellanox.com>

[ Upstream commit 071995c877a8646209d55ff8edddd2b054e7424c ]

Fix a bug where driver did not verify Hardware pin capabilities for
PTP functions.

Fixes: ee7f12205abc ("net/mlx5e: Implement 1PPS support")
Signed-off-by: Eran Ben Elisha <era...@mellanox.com>
Reviewed-by: Ariel Levkovich <lar...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 .../ethernet/mellanox/mlx5/core/lib/clock.c   | 23 ++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c 
b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index 43f97601b5000..75fc283cacc36 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -388,10 +388,31 @@ static int mlx5_ptp_enable(struct ptp_clock_info *ptp,
        return 0;
 }
 
+enum {
+       MLX5_MTPPS_REG_CAP_PIN_X_MODE_SUPPORT_PPS_IN = BIT(0),
+       MLX5_MTPPS_REG_CAP_PIN_X_MODE_SUPPORT_PPS_OUT = BIT(1),
+};
+
 static int mlx5_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
                           enum ptp_pin_function func, unsigned int chan)
 {
-       return (func == PTP_PF_PHYSYNC) ? -EOPNOTSUPP : 0;
+       struct mlx5_clock *clock = container_of(ptp, struct mlx5_clock,
+                                               ptp_info);
+
+       switch (func) {
+       case PTP_PF_NONE:
+               return 0;
+       case PTP_PF_EXTTS:
+               return !(clock->pps_info.pin_caps[pin] &
+                        MLX5_MTPPS_REG_CAP_PIN_X_MODE_SUPPORT_PPS_IN);
+       case PTP_PF_PEROUT:
+               return !(clock->pps_info.pin_caps[pin] &
+                        MLX5_MTPPS_REG_CAP_PIN_X_MODE_SUPPORT_PPS_OUT);
+       default:
+               return -EOPNOTSUPP;
+       }
+
+       return -EOPNOTSUPP;
 }
 
 static const struct ptp_clock_info mlx5_ptp_clock_info = {
-- 
2.25.1