linux-kernel - [RFC PATCH 2/2] net: fec: reset phy in resume if it was powered down

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Message-Id: <20211206101326.1022527-3-philippe.schenker@toradex.com>
Date:   Mon,  6 Dec 2021 11:13:26 +0100
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     netdev@...r.kernel.org, Joakim Zhang <qiangqing.zhang@....com>,
        Fabio Estevam <festevam@...il.com>,
        Fugang Duan <fugang.duan@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>
Cc:     Philippe Schenker <philippe.schenker@...adex.com>,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 2/2] net: fec: reset phy in resume if it was powered down

If a board solely rely on a GPIO to reset the PHY after power-up, the
PHY won't work after a power-down where the power was cut.

Reset the PHY after power-enable in fec_resume.

Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>

---

 drivers/net/ethernet/freescale/fec_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 92840f18c48f..41c3825cd768 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -4118,6 +4118,10 @@ static int __maybe_unused fec_resume(struct device *dev)
 		ret = regulator_enable(fep->reg_phy);
 		if (ret)
 			return ret;
+
+		ret = fec_reset_phy(ndev);
+		if (ret)
+			return ret;
 	}
 
 	rtnl_lock();
-- 
2.34.0