linux-kernel - [PATCH AUTOSEL 4.9 10/14] net: macb: disable scatter-gather for macb on sama5d3

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Message-Id: <20181005161704.20704-10-sashal@kernel.org>
Date:   Fri,  5 Oct 2018 12:17:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.9 10/14] net: macb: disable scatter-gather for macb on sama5d3

From: Nicolas Ferre <nicolas.ferre@...rochip.com>

[ Upstream commit eb4ed8e2d7fecb5f40db38e4498b9ee23cddf196 ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/ethernet/cadence/macb.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index ec09fcece711..c4ccbb4453f2 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -2861,6 +2861,13 @@ 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,
@@ -2925,6 +2932,7 @@ 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 },
-- 
2.17.1