netdev - [PATCH v2 1/2] net: phylink: init phydev on phylink

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Message-ID: <20221212112845.73290-2-claudiu.beznea@microchip.com>
Date:   Mon, 12 Dec 2022 13:28:44 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <nicolas.ferre@...rochip.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux@...linux.org.uk>, <andrew@...n.ch>, <hkallweit1@...il.com>
CC:     <sergiu.moga@...rochip.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH v2 1/2] net: phylink: init phydev on phylink_resume()

There are scenarios where PHY power is cut off on system suspend.
There are also MAC drivers which handles themselves the PHY on
suspend/resume path. For such drivers the
struct phy_device::mac_managed_phy is set to true and thus the
mdio_bus_phy_suspend()/mdio_bus_phy_resume() wouldn't do the
proper PHY suspend/resume. For such scenarios call phy_init_hw()
from phylink_resume().

Suggested-by: Russell King (Oracle) <linux@...linux.org.uk>
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---

Hi, Russel,

I let phy_init_hw() to execute for all devices. I can restrict it only
for PHYs that has struct phy_device::mac_managed_phy = true.

Please let me know what you think.

Thank you,
Claudiu Beznea

 drivers/net/phy/phylink.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 09cc65c0da93..6003c329638e 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -2031,6 +2031,12 @@ void phylink_resume(struct phylink *pl)
 {
 	ASSERT_RTNL();

+	if (pl->phydev) {
+		int ret = phy_init_hw(pl->phydev);
+		if (ret)
+			return;
+	}
+
 	if (test_bit(PHYLINK_DISABLE_MAC_WOL, &pl->phylink_disable_state)) {
 		/* Wake-on-Lan enabled, MAC handling */

-- 
2.34.1