linux-kernel - [PATCH] net: stmmac: don't stop RXC during LPI

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Message-Id: <20220123141245.1060-1-jszhang@kernel.org>
Date:   Sun, 23 Jan 2022 22:12:45 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: stmmac: don't stop RXC during LPI

I met can't receive rx pkt issue with below steps:
0.plug in ethernet cable then boot normal and get ip from dhcp server
1.quickly hotplug out then hotplug in the ethernet cable
2.trigger the dhcp client to renew lease

tcpdump shows that the request tx pkt is sent out successfully,
but the mac can't receive the rx pkt.

The issue can easily be reproduced on platforms with PHY_POLL external
phy. If we don't allow the phy to stop the RXC during LPI, the issue
is gone. I think it's unsafe to stop the RXC during LPI because the mac
needs RXC clock to support RX logic.

And the 2nd param clk_stop_enable of phy_init_eee() is a bool, so use
false instead of 0.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 6708ca2aa4f7..92a9b0b226b1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1162,7 +1162,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 
 	stmmac_mac_set(priv, priv->ioaddr, true);
 	if (phy && priv->dma_cap.eee) {
-		priv->eee_active = phy_init_eee(phy, 1) >= 0;
+		priv->eee_active = phy_init_eee(phy, false) >= 0;
 		priv->eee_enabled = stmmac_eee_init(priv);
 		priv->tx_lpi_enabled = priv->eee_enabled;
 		stmmac_set_eee_pls(priv, priv->hw, true);
-- 
2.34.1