netdev - [PATCH] net: macb: disable scatter-gather for macb on sama5d3

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Message-ID: <20180914154811.12090-1-nicolas.ferre@microchip.com>
Date:   Fri, 14 Sep 2018 17:48:10 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     <netdev@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        <devicetree@...r.kernel.org>,
        "Nicolas Ferre" <nicolas.ferre@...rochip.com>
Subject: [PATCH] net: macb: disable scatter-gather for macb on sama5d3

Create a new configuration for the sama5d3-macb new compatibility string.
This configuration disables scatter-gather because we experienced lock down
of the macb interface of this particular SoC under very high load.

Signed-off-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 16e4ef7d7185..f1a86b422617 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -3837,6 +3837,13 @@ static const struct macb_config at91sam9260_config = {
 	.init = macb_init,
 };
 
+static const struct macb_config sama5d3macb_config = {
+	.caps = MACB_CAPS_SG_DISABLED
+	      | MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
+	.clk_init = macb_clk_init,
+	.init = macb_init,
+};
+
 static const struct macb_config pc302gem_config = {
 	.caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
 	.dma_burst_length = 16,
@@ -3904,6 +3911,7 @@ static const struct of_device_id macb_dt_ids[] = {
 	{ .compatible = "cdns,gem", .data = &pc302gem_config },
 	{ .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config },
 	{ .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config },
+	{ .compatible = "atmel,sama5d3-macb", .data = &sama5d3macb_config },
 	{ .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
 	{ .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
 	{ .compatible = "cdns,emac", .data = &emac_config },
-- 
2.15.1