linux-kernel - [RESEND][PATCH] net: cpsw: fix obtaining mac address for am3517

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Message-ID: <20230624121211.19711-1-mans@mansr.com>
Date:   Sat, 24 Jun 2023 13:10:59 +0100
From:   Mans Rullgard <mans@...sr.com>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-omap@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jeroen Hofstee <jhofstee@...tronenergy.com>,
        Tony Lindgren <tony@...mide.com>
Subject: [RESEND][PATCH] net: cpsw: fix obtaining mac address for am3517

From: Jeroen Hofstee <jhofstee@...tronenergy.com>

Commit b6745f6e4e63 ("drivers: net: cpsw: davinci_emac: move reading mac
id to common file") did not only move the code for an am3517, it also
added the slave parameter, resulting in an invalid (all zero) mac address
being returned for an am3517, since it only has a single emac and the slave
parameter is pointing to the second. So simply always read the first and
valid mac-address.

Signed-off-by: Jeroen Hofstee <jhofstee@...tronenergy.com>
Acked-by: Tony Lindgren <tony@...mide.com>
---
 drivers/net/ethernet/ti/cpsw-common.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/cpsw-common.c b/drivers/net/ethernet/ti/cpsw-common.c
index bfa81bbfce3f..465dc15f059d 100644
--- a/drivers/net/ethernet/ti/cpsw-common.c
+++ b/drivers/net/ethernet/ti/cpsw-common.c
@@ -74,8 +74,12 @@ int ti_cm_get_macid(struct device *dev, int slave, u8 *mac_addr)
 	if (of_machine_is_compatible("ti,am33xx"))
 		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
 
+	/*
+	 * There is only one emac / mac address on an am3517 so ignore the
+	 * slave = 1 and always get the macid from slave 0.
+	 */
 	if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
-		return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr);
+		return davinci_emac_3517_get_macid(dev, 0x110, 0, mac_addr);
 
 	if (of_device_is_compatible(dev->of_node, "ti,dm816-emac"))
 		return cpsw_am33xx_cm_get_macid(dev, 0x30, slave, mac_addr);
-- 
2.41.0