linux-kernel - [PATCH 5.9 010/757] net: fec: Fix PHY init after phy_reset_after_clk

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Date:   Tue, 27 Oct 2020 14:44:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Richard Leitner <richard.leitner@...data.com>,
        Marek Vasut <marex@...x.de>,
        Christoph Niedermaier <cniedermaier@...electronics.com>,
        "David S. Miller" <davem@...emloft.net>,
        NXP Linux Team <linux-imx@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.9 010/757] net: fec: Fix PHY init after phy_reset_after_clk_enable()

From: Marek Vasut <marex@...x.de>

[ Upstream commit 0da1ccbbefb662915228bc17e1c7d4ad28b3ddab ]

The phy_reset_after_clk_enable() does a PHY reset, which means the PHY
loses its register settings. The fec_enet_mii_probe() starts the PHY
and does the necessary calls to configure the PHY via PHY framework,
and loads the correct register settings into the PHY. Therefore,
fec_enet_mii_probe() should be called only after the PHY has been
reset, not before as it is now.

Fixes: 1b0a83ac04e3 ("net: fec: add phy_reset_after_clk_enable() support")
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Tested-by: Richard Leitner <richard.leitner@...data.com>
Signed-off-by: Marek Vasut <marex@...x.de>
Cc: Christoph Niedermaier <cniedermaier@...electronics.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: NXP Linux Team <linux-imx@....com>
Cc: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/freescale/fec_main.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3005,17 +3005,17 @@ fec_enet_open(struct net_device *ndev)
 	/* Init MAC prior to mii bus probe */
 	fec_restart(ndev);
 
-	/* Probe and connect to PHY when open the interface */
-	ret = fec_enet_mii_probe(ndev);
-	if (ret)
-		goto err_enet_mii_probe;
-
 	/* Call phy_reset_after_clk_enable() again if it failed during
 	 * phy_reset_after_clk_enable() before because the PHY wasn't probed.
 	 */
 	if (reset_again)
 		fec_enet_phy_reset_after_clk_enable(ndev);
 
+	/* Probe and connect to PHY when open the interface */
+	ret = fec_enet_mii_probe(ndev);
+	if (ret)
+		goto err_enet_mii_probe;
+
 	if (fep->quirks & FEC_QUIRK_ERR006687)
 		imx6q_cpuidle_fec_irqs_used();