linux-kernel - [PATCH net v2 08/10] net: stmmac: xgmac: Disable Flow Control when 1 or more queues are in AV

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Message-Id: <efeb1da2bc93722b9cce10c355bb540135cb7327.1572519070.git.Jose.Abreu@synopsys.com>
Date:   Thu, 31 Oct 2019 12:00:46 +0100
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     netdev@...r.kernel.org
Cc:     Joao Pinto <Joao.Pinto@...opsys.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net v2 08/10] net: stmmac: xgmac: Disable Flow Control when 1 or more queues are in AV

When in AVB mode we need to disable flow control to prevent MAC from
pausing in TX side.

Fixes: ec6ea8e3eee9 ("net: stmmac: Add CBS support in XGMAC2")
Signed-off-by: Jose Abreu <Jose.Abreu@...opsys.com>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: Alexandre Torgue <alexandre.torgue@...com>
Cc: Jose Abreu <joabreu@...opsys.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc: netdev@...r.kernel.org
Cc: linux-stm32@...md-mailman.stormreply.com
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
index 7bd1447f9f47..f148cb2061d8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
@@ -473,6 +473,7 @@ static void dwxgmac2_enable_tso(void __iomem *ioaddr, bool en, u32 chan)
 static void dwxgmac2_qmode(void __iomem *ioaddr, u32 channel, u8 qmode)
 {
 	u32 value = readl(ioaddr + XGMAC_MTL_TXQ_OPMODE(channel));
+	u32 flow = readl(ioaddr + XGMAC_RX_FLOW_CTRL);
 
 	value &= ~XGMAC_TXQEN;
 	if (qmode != MTL_QUEUE_AVB) {
@@ -480,6 +481,7 @@ static void dwxgmac2_qmode(void __iomem *ioaddr, u32 channel, u8 qmode)
 		writel(0, ioaddr + XGMAC_MTL_TCx_ETS_CONTROL(channel));
 	} else {
 		value |= 0x1 << XGMAC_TXQEN_SHIFT;
+		writel(flow & (~XGMAC_RFE), ioaddr + XGMAC_RX_FLOW_CTRL);
 	}
 
 	writel(value, ioaddr +  XGMAC_MTL_TXQ_OPMODE(channel));
-- 
2.7.4