netdev - [PATCH RFC net-next 2/5] net: phylink: add phylink_prepare

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Message-Id: <E1tnf1N-0056L5-2X@rmk-PC.armlinux.org.uk>
Date: Thu, 27 Feb 2025 14:37:53 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jon Hunter <jonathanh@...dia.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Thierry Reding <treding@...dia.com>
Subject: [PATCH RFC net-next 2/5] net: phylink: add phylink_prepare_resume()

Add a resume preparation function, which will ensure that the receive
clock from the PHY is appropriately configured while resuming.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phylink.c | 24 ++++++++++++++++++++++++
 include/linux/phylink.h   |  1 +
 2 files changed, 25 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 0aae0bb2a254..976e569feb70 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -2636,6 +2636,30 @@ void phylink_suspend(struct phylink *pl, bool mac_wol)
 }
 EXPORT_SYMBOL_GPL(phylink_suspend);
 
+/**
+ * phylink_prepare_resume() - prepare to resume a network device
+ * @pl: a pointer to a &struct phylink returned from phylink_create()
+ *
+ * Optional, thus must be called prior to phylink_resume().
+ *
+ * Prepare to resume a network device, preparing the PHY as necessary.
+ */
+void phylink_prepare_resume(struct phylink *pl)
+{
+	ASSERT_RTNL();
+
+	/* If the MAC requires the receive clock, but receive clock
+	 * stop was enabled at the PHY, we need to ensure that the
+	 * receive clock is running. Disable receive clock stop.
+	 * phylink_resume() will re-enable it if necessary.
+	 */
+	if (pl->mac_supports_eee_ops && pl->phydev &&
+	    pl->config->mac_requires_rxc &&
+	    pl->config->eee_rx_clk_stop_enable)
+		phy_eee_rx_clock_stop(pl->phydev, false);
+}
+EXPORT_SYMBOL_GPL(phylink_prepare_resume);
+
 /**
  * phylink_resume() - handle a network device resume event
  * @pl: a pointer to a &struct phylink returned from phylink_create()
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index 08df65f6867a..071ed4683c8c 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -699,6 +699,7 @@ void phylink_start(struct phylink *);
 void phylink_stop(struct phylink *);
 
 void phylink_suspend(struct phylink *pl, bool mac_wol);
+void phylink_prepare_resume(struct phylink *pl);
 void phylink_resume(struct phylink *pl);
 
 void phylink_ethtool_get_wol(struct phylink *, struct ethtool_wolinfo *);
-- 
2.30.2