netdev - [PATCH v3 14/16] net: stmmac: dwmac-loongson: Disable flow control for GMAC

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Date: Thu,  3 Aug 2023 19:30:35 +0800
From: Feiyang Chen <chenfeiyang@...ngson.cn>
To: andrew@...n.ch,
	hkallweit1@...il.com,
	peppe.cavallaro@...com,
	alexandre.torgue@...s.st.com,
	joabreu@...opsys.com,
	chenhuacai@...ngson.cn
Cc: Feiyang Chen <chenfeiyang@...ngson.cn>,
	linux@...linux.org.uk,
	dongbiao@...ngson.cn,
	loongson-kernel@...ts.loongnix.cn,
	netdev@...r.kernel.org,
	loongarch@...ts.linux.dev,
	chris.chenfeiyang@...il.com
Subject: [PATCH v3 14/16] net: stmmac: dwmac-loongson: Disable flow control for GMAC

Loongson GMAC does not support Flow Control feature. Use
disable_flow_control flag to disable it.

Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c | 1 +
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c    | 5 +++++
 include/linux/stmmac.h                               | 1 +
 3 files changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
index 18bca996e1cb..40eddadd0bd2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
@@ -95,6 +95,7 @@ static int loongson_gmac_config(struct pci_dev *pdev,
 	}
 
 	plat->dma_reset_times = 5;
+	plat->disable_flow_control = true;
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 5eafb08e2332..65ee5a681dcf 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3827,6 +3827,11 @@ static int __stmmac_open(struct net_device *dev,
 				   __func__, ret);
 			goto init_phy_error;
 		}
+
+		if (priv->plat->disable_flow_control) {
+			phy_support_sym_pause(dev->phydev);
+			phy_set_sym_pause(dev->phydev, false, false, true);
+		}
 	}
 
 	/* Extra statistics */
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 2b59ddbe59ea..07570d808edb 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -360,5 +360,6 @@ struct plat_stmmacenet_data {
 	bool dma_reset_times;
 	u32 control_value;
 	u32 irq_flags;
+	bool disable_flow_control;
 };
 #endif
-- 
2.39.3