netdev - [PATCH RFC net-next 3/3] net: stmmac: block PHY rx clock-stop over reset

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Message-Id: <E1tpPtz-005Soh-EG@rmk-PC.armlinux.org.uk>
Date: Tue, 04 Mar 2025 10:53:31 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Jon Hunter <jonathanh@...dia.com>,
	 Thierry Reding <treding@...dia.com>,
	 "Lad,
	 Prabhakar" <prabhakar.csengg@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew@...n.ch>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	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>
Subject: [PATCH RFC net-next 3/3] net: stmmac: block PHY rx clock-stop over
 reset

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index aec230353ac4..21026ea7541c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3097,7 +3097,10 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 	if (priv->extend_desc && (priv->mode == STMMAC_RING_MODE))
 		priv->plat->dma_cfg->atds = 1;
 
+	/* Note that the PHY clock must be running for reset to complete. */
+	phylink_rx_clk_stop_block(priv->phylink);
 	ret = stmmac_reset(priv, priv->ioaddr);
+	phylink_rx_clk_stop_unblock(priv->phylink);
 	if (ret) {
 		netdev_err(priv->dev, "Failed to reset the dma\n");
 		return ret;
-- 
2.30.2