linux-kernel - [PATCH 4.19 223/306] net: dsa: bcm_sf2: Turn on PHY to allow successful registration

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Message-Id: <20191127203131.347612884@linuxfoundation.org>
Date:   Wed, 27 Nov 2019 21:31:13 +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, Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 223/306] net: dsa: bcm_sf2: Turn on PHY to allow successful registration

From: Florian Fainelli <f.fainelli@...il.com>

[ Upstream commit c04a17d2a9ccf1eaba1c5a56f83e997540a70556 ]

We are binding to the PHY using the SF2 slave MDIO bus that we create,
binding involves reading the PHY's MII_PHYSID1/2 which won't be possible
if the PHY is turned off. Temporarily turn it on/off for the bus probing
to succeeed. This fixes unbind/bind problems where the port connecting
to that PHY would be in error since it could not connect to it.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/bcm_sf2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index ca3655d28e00f..17cec68e56b4f 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -1099,12 +1099,16 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	bcm_sf2_gphy_enable_set(priv->dev->ds, true);
+
 	ret = bcm_sf2_mdio_register(ds);
 	if (ret) {
 		pr_err("failed to register MDIO bus\n");
 		return ret;
 	}
 
+	bcm_sf2_gphy_enable_set(priv->dev->ds, false);
+
 	ret = bcm_sf2_cfp_rst(priv);
 	if (ret) {
 		pr_err("failed to reset CFP\n");
-- 
2.20.1