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Message-Id: <20220623134645.1858361-2-enguerrand.de-ribaucourt@savoirfairelinux.com>
Date: Thu, 23 Jun 2022 15:46:44 +0200
From: Enguerrand de Ribaucourt
<enguerrand.de-ribaucourt@...oirfairelinux.com>
To: andrew@...n.ch
Cc: davem@...emloft.net, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux@...linux.org.uk,
hkallweit1@...il.com,
Enguerrand de Ribaucourt
<enguerrand.de-ribaucourt@...oirfairelinux.com>
Subject: [PATCH v3 1/2] net: dp83822: disable false carrier interrupt
When unplugging an Ethernet cable, false carrier events were produced by
the PHY at a very high rate. Once the false carrier counter full, an
interrupt was triggered every few clock cycles until the cable was
replugged. This resulted in approximately 10k/s interrupts.
Since the false carrier counter (FCSCR) is never used, we can safely
disable this interrupt.
In addition to improving performance, this also solved MDIO read
timeouts I was randomly encountering with an i.MX8 fec MAC because of
the interrupt flood. The interrupt count and MDIO timeout fix were
tested on a v5.4.110 kernel.
Signed-off-by: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Fixes: 87461f7a58ab ("net: phy: DP83822 initial driver submission")
---
drivers/net/phy/dp83822.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
index e6ad3a494d32..95ef507053a6 100644
--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -230,7 +230,6 @@ static int dp83822_config_intr(struct phy_device *phydev)
return misr_status;
misr_status |= (DP83822_RX_ERR_HF_INT_EN |
- DP83822_FALSE_CARRIER_HF_INT_EN |
DP83822_LINK_STAT_INT_EN |
DP83822_ENERGY_DET_INT_EN |
DP83822_LINK_QUAL_INT_EN);
--
2.25.1
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