netdev - [PATCH net-next 5/5] net: stmmac: Limit max speeds of XGMAC if asked to

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Date:   Fri,  6 Sep 2019 09:41:17 +0200
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>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 5/5] net: stmmac: Limit max speeds of XGMAC if asked to

We may have some SoCs that can't achieve XGMAC max speed. Limit it if
asked to.

Signed-off-by: Jose Abreu <joabreu@...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-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 25 +++++++++++++++--------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c3baca9f587b..686b82068142 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -831,15 +831,22 @@ static void stmmac_validate(struct phylink_config *config,
 		phylink_set(mask, 1000baseT_Full);
 		phylink_set(mask, 1000baseX_Full);
 	} else if (priv->plat->has_xgmac) {
-		phylink_set(mac_supported, 2500baseT_Full);
-		phylink_set(mac_supported, 5000baseT_Full);
-		phylink_set(mac_supported, 10000baseSR_Full);
-		phylink_set(mac_supported, 10000baseLR_Full);
-		phylink_set(mac_supported, 10000baseER_Full);
-		phylink_set(mac_supported, 10000baseLRM_Full);
-		phylink_set(mac_supported, 10000baseT_Full);
-		phylink_set(mac_supported, 10000baseKX4_Full);
-		phylink_set(mac_supported, 10000baseKR_Full);
+		if (!max_speed || (max_speed >= 2500)) {
+			phylink_set(mac_supported, 2500baseT_Full);
+			phylink_set(mac_supported, 2500baseX_Full);
+		}
+		if (!max_speed || (max_speed >= 5000)) {
+			phylink_set(mac_supported, 5000baseT_Full);
+		}
+		if (!max_speed || (max_speed >= 10000)) {
+			phylink_set(mac_supported, 10000baseSR_Full);
+			phylink_set(mac_supported, 10000baseLR_Full);
+			phylink_set(mac_supported, 10000baseER_Full);
+			phylink_set(mac_supported, 10000baseLRM_Full);
+			phylink_set(mac_supported, 10000baseT_Full);
+			phylink_set(mac_supported, 10000baseKX4_Full);
+			phylink_set(mac_supported, 10000baseKR_Full);
+		}
 	}
 
 	/* Half-Duplex can only work with single queue */
-- 
2.7.4