linux-kernel - [PATCH AUTOSEL 5.4 6/8] net: emaclite: Don't advertise 1000BASE-T and do auto negotiation

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Message-Id: <20220510154536.154070-6-sashal@kernel.org>
Date:   Tue, 10 May 2022 11:45:34 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Shravya Kumbham <shravya.kumbham@...inx.com>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>,
        Andrew Lunn <andrew@...n.ch>, Paolo Abeni <pabeni@...hat.com>,
        Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, michal.simek@...inx.com,
        yuehaibing@...wei.com, linmq006@...il.com, trix@...hat.com,
        prabhakar.mahadev-lad.rj@...renesas.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 6/8] net: emaclite: Don't advertise 1000BASE-T and do auto negotiation

From: Shravya Kumbham <shravya.kumbham@...inx.com>

[ Upstream commit b800528b97d0adc3a5ba42d78a8b0d3f07a31f44 ]

In xemaclite_open() function we are setting the max speed of
emaclite to 100Mb using phy_set_max_speed() function so,
there is no need to write the advertising registers to stop
giga-bit speed and the phy_start() function starts the
auto-negotiation so, there is no need to handle it separately
using advertising registers. Remove the phy_read and phy_write
of advertising registers in xemaclite_open() function.

Signed-off-by: Shravya Kumbham <shravya.kumbham@...inx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/xilinx/xilinx_emaclite.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index 63a2d1bcccfb..5fae598c4f76 100644
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -923,8 +923,6 @@ static int xemaclite_open(struct net_device *dev)
 	xemaclite_disable_interrupts(lp);
 
 	if (lp->phy_node) {
-		u32 bmcr;
-
 		lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
 					     xemaclite_adjust_link, 0,
 					     PHY_INTERFACE_MODE_MII);
@@ -935,19 +933,6 @@ static int xemaclite_open(struct net_device *dev)
 
 		/* EmacLite doesn't support giga-bit speeds */
 		phy_set_max_speed(lp->phy_dev, SPEED_100);
-
-		/* Don't advertise 1000BASE-T Full/Half duplex speeds */
-		phy_write(lp->phy_dev, MII_CTRL1000, 0);
-
-		/* Advertise only 10 and 100mbps full/half duplex speeds */
-		phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL |
-			  ADVERTISE_CSMA);
-
-		/* Restart auto negotiation */
-		bmcr = phy_read(lp->phy_dev, MII_BMCR);
-		bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
-		phy_write(lp->phy_dev, MII_BMCR, bmcr);
-
 		phy_start(lp->phy_dev);
 	}
 
-- 
2.35.1