net/enetc: fix Rx lock-up

The default value in hardware for the Rx MAC FIFO (@) is higher than it
should be and can lead to Rx lock-up under traffic.
Set it to the value recommended by hardware team, 1.

Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
Signed-off-by: Gagandeep Singh <g.singh@nxp.com>

diff --git a/drivers/net/enetc/base/enetc_hw.h b/drivers/net/enetc/base/enetc_hw.h
index 2fe7ccb..0081328 100644 (file)
--- a/drivers/net/enetc/base/enetc_hw.h
+++ b/drivers/net/enetc/base/enetc_hw.h
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: BSD-3-Clause
- * Copyright 2018-2019 NXP
+ * Copyright 2018-2020 NXP
  */
 
 #ifndef _ENETC_HW_H_
@@ -86,6 +86,7 @@ enum enetc_bdr_type {TX, RX};
 #define ENETC_PSIPMAR1(n)              (0x00104 + (n) * 0x20)
 #define ENETC_PCAPR0                   0x00900
 #define ENETC_PCAPR1                   0x00904
+#define ENETC_PM0_RX_FIFO              0x801C
 #define ENETC_PM0_IF_MODE              0x8300
 #define ENETC_PM1_IF_MODE              0x9300
 #define ENETC_PMO_IFM_RG               BIT(2)

diff --git a/drivers/net/enetc/enetc_ethdev.c b/drivers/net/enetc/enetc_ethdev.c
index 20b77c0..eb637d0 100644 (file)
--- a/drivers/net/enetc/enetc_ethdev.c
+++ b/drivers/net/enetc/enetc_ethdev.c
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: BSD-3-Clause
- * Copyright 2018-2019 NXP
+ * Copyright 2018-2020 NXP
  */
 
 #include <stdbool.h>
@@ -147,6 +147,9 @@ enetc_hardware_init(struct enetc_eth_hw *hw)
        hw->hw.port = (void *)((size_t)hw->hw.reg + ENETC_PORT_BASE);
        hw->hw.global = (void *)((size_t)hw->hw.reg + ENETC_GLOBAL_BASE);
 
+       /* WA for Rx lock-up HW erratum */
+       enetc_port_wr(enetc_hw, ENETC_PM0_RX_FIFO, 1);
+
        /* Enabling Station Interface */
        enetc_wr(enetc_hw, ENETC_SIMR, ENETC_SIMR_EN);