linux-kernel - [PATCH net v3 1/5] net: dsa: vsc73xx: fix port MAC configuration in full duplex mode

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Message-Id: <20240809193807.2221897-2-paweldembicki@gmail.com>
Date: Fri,  9 Aug 2024 21:38:02 +0200
From: Pawel Dembicki <paweldembicki@...il.com>
To: netdev@...r.kernel.org
Cc: Pawel Dembicki <paweldembicki@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH net v3 1/5] net: dsa: vsc73xx: fix port MAC configuration in full duplex mode

According to the datasheet description ("Port Mode Procedure" in 5.6.2),
the VSC73XX_MAC_CFG_WEXC_DIS bit is configured only for half duplex mode.

The WEXC_DIS bit is responsible for MAC behavior after an excessive
collision. Let's set it as described in the datasheet.

Fixes: 05bd97fc559d ("net: dsa: Add Vitesse VSC73xx DSA router driver")
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
Signed-off-by: Pawel Dembicki <paweldembicki@...il.com>
---
v3:
  - resend only
v2:
  - Added 'Fixes' and 'Reviewed-by' to commit message.

This patch came from net-next series[0].
Changes since net-next:
  - rebased to netdev/main only

[0] https://patchwork.kernel.org/project/netdevbpf/patch/20240729210615.279952-6-paweldembicki@gmail.com/
---
 drivers/net/dsa/vitesse-vsc73xx-core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index d9d3e30fd47a..f548ed4cb23f 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -957,6 +957,11 @@ static void vsc73xx_mac_link_up(struct phylink_config *config,
 
 	if (duplex == DUPLEX_FULL)
 		val |= VSC73XX_MAC_CFG_FDX;
+	else
+		/* In datasheet description ("Port Mode Procedure" in 5.6.2)
+		 * this bit is configured only for half duplex.
+		 */
+		val |= VSC73XX_MAC_CFG_WEXC_DIS;
 
 	/* This routine is described in the datasheet (below ARBDISC register
 	 * description)
@@ -967,7 +972,6 @@ static void vsc73xx_mac_link_up(struct phylink_config *config,
 	get_random_bytes(&seed, 1);
 	val |= seed << VSC73XX_MAC_CFG_SEED_OFFSET;
 	val |= VSC73XX_MAC_CFG_SEED_LOAD;
-	val |= VSC73XX_MAC_CFG_WEXC_DIS;
 
 	/* Those bits are responsible for MTU only. Kernel takes care about MTU,
 	 * let's enable +8 bytes frame length unconditionally.
-- 
2.34.1