linux-kernel - [PATCH] gianfar: Solve ethernet TX/RX problems for ls1021a

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Date:   Tue, 7 Jan 2020 10:36:32 +0000
From:   Johnson CH Chen (陳昭勳) 
        <JohnsonCH.Chen@...a.com>
To:     "claudiu.manoil@....com" <claudiu.manoil@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Johnson CH Chen (陳昭勳) 
        <JohnsonCH.Chen@...a.com>,
        "zero19850401@...il.com" <zero19850401@...il.com>
Subject: [PATCH] gianfar: Solve ethernet TX/RX problems for ls1021a

Add dma_endian_le to solve ethernet TX/RX problems for freescale ls1021a. Without this, it will result in 
rx-busy-errors by ethtool, and transmit queue timeout in ls1021a's platforms.

Signed-off-by: Johnson Chen <johnsonch.chen@...a.com>
---
 drivers/net/ethernet/freescale/gianfar.c | 3 +++
 drivers/net/ethernet/freescale/gianfar.h | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 72868a28b621..ab4e45199df9 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -833,6 +833,7 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
 
 	/* Find the TBI PHY.  If it's not there, we don't support SGMII */
 	priv->tbi_node = of_parse_phandle(np, "tbi-handle", 0);
+	priv->dma_endian_le = of_property_read_bool(np, "fsl,dma-endian-le");
 
 	return 0;
 
@@ -1209,6 +1210,8 @@ static void gfar_start(struct gfar_private *priv)
 	/* Initialize DMACTRL to have WWR and WOP */
 	tempval = gfar_read(&regs->dmactrl);
 	tempval |= DMACTRL_INIT_SETTINGS;
+	if (priv->dma_endian_le)
+		tempval |= DMACTRL_LE;
 	gfar_write(&regs->dmactrl, tempval);
 
 	/* Make sure we aren't stopped */
diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h
index 432c6a818ae5..aae07db5206b 100644
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -215,6 +215,7 @@ extern const char gfar_driver_version[];
 #define DMACTRL_INIT_SETTINGS   0x000000c3
 #define DMACTRL_GRS             0x00000010
 #define DMACTRL_GTS             0x00000008
+#define DMACTRL_LE		0x00008000
 
 #define TSTAT_CLEAR_THALT_ALL	0xFF000000
 #define TSTAT_CLEAR_THALT	0x80000000
@@ -1140,6 +1141,9 @@ struct gfar_private {
 		tx_pause_en:1,
 		rx_pause_en:1;
 
+	/* little endian dma buffer and descriptor host interface */
+	unsigned int dma_endian_le;
+
 	/* The total tx and rx ring size for the enabled queues */
 	unsigned int total_tx_ring_size;
 	unsigned int total_rx_ring_size;
-- 
2.11.0

Best regards,
Johnson