target/linux/layerscape/patches-5.4/701-net-0407-LF-924-net-enetc-Set-MAC-Rx-FIFO-to-recommended-valu.patch

From 9507f517ac4080627515c31c937f45a4a58ccbe4 Mon Sep 17 00:00:00 2001
From: Alex Marginean <alexandru.marginean@nxp.com>
Date: Fri, 14 Feb 2020 17:28:26 +0000
Subject: [PATCH] LF-924: net/enetc: Set MAC Rx FIFO to recommended value

On LS1028A the MAC Rx FIFO defaults to value 2, which is too high and may
lead to Rx lock-up under traffic.  Set it to 1 instead, as recommended by
the hardware team.

Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>
---
 drivers/net/ethernet/freescale/enetc/enetc_hw.h | 2 ++
 drivers/net/ethernet/freescale/enetc/enetc_pf.c | 6 ++++++
 2 files changed, 8 insertions(+)

--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -226,6 +226,8 @@ enum enetc_bdr_type {TX, RX};
 #define ENETC_PM0_MAXFRM	0x8014
 #define ENETC_SET_TX_MTU(val)	((val) << 16)
 #define ENETC_SET_MAXFRM(val)	((val) & 0xffff)
+#define ENETC_PM0_RX_FIFO	0x801c
+#define ENETC_PM0_RX_FIFO_VAL	1
 
 #define ENETC_PM_IMDIO_BASE	0x8030
 /* PCS registers */
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
@@ -536,6 +536,12 @@ static void enetc_configure_port_mac(str
 		enetc_port_wr(hw, ENETC_PM0_IF_MODE, ENETC_PM0_IFM_XGMII);
 		enetc_port_wr(hw, ENETC_PM1_IF_MODE, ENETC_PM0_IFM_XGMII);
 	}
+
+	/* on LS1028A the MAC Rx FIFO defaults to value 2, which is too high and
+	 * may lead to Rx lock-up under traffic.  Set it to 1 instead, as
+	 * recommended by the hardware team.
+	 */
+	enetc_port_wr(hw, ENETC_PM0_RX_FIFO, ENETC_PM0_RX_FIFO_VAL);
 }
 
 static void enetc_configure_port_pmac(struct enetc_hw *hw)