net/mlx5: Fix access to a non-supported register

Validate MRTC register is supported before triggering a delayed work
which accesses it.

Fixes: 5a1023de ("net/mlx5: Add periodic update of host time to firmware")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/health.c

@@ -836,7 +836,7 @@ void mlx5_start_health_poll(struct mlx5_core_dev *dev)
 	health->timer.expires = jiffies + msecs_to_jiffies(poll_interval_ms);
 	add_timer(&health->timer);
 
-	if (mlx5_core_is_pf(dev))
+	if (mlx5_core_is_pf(dev) && MLX5_CAP_MCAM_REG(dev, mrtc))
 		queue_delayed_work(health->wq, &health->update_fw_log_ts_work, 0);
 }
 

drivers/net/ethernet/mellanox/mlx5/core/main.c

@@ -1071,18 +1071,16 @@ static int mlx5_function_setup(struct mlx5_core_dev *dev, bool boot)
 
 	mlx5_set_driver_version(dev);
 
-	mlx5_start_health_poll(dev);
-
 	err = mlx5_query_hca_caps(dev);
 	if (err) {
 		mlx5_core_err(dev, "query hca failed\n");
-		goto stop_health;
+		goto reclaim_boot_pages;
 	}
 
+	mlx5_start_health_poll(dev);
+
 	return 0;
 
-stop_health:
-	mlx5_stop_health_poll(dev, boot);
 reclaim_boot_pages:
 	mlx5_reclaim_startup_pages(dev);
 err_disable_hca:

include/linux/mlx5/mlx5_ifc.h

@@ -9698,7 +9698,10 @@ struct mlx5_ifc_mcam_access_reg_bits {
 	u8         regs_84_to_68[0x11];
 	u8         tracer_registers[0x4];
 
-	u8         regs_63_to_32[0x20];
+	u8         regs_63_to_46[0x12];
+	u8         mrtc[0x1];
+	u8         regs_44_to_32[0xd];
+
 	u8         regs_31_to_0[0x20];
 };