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Message-Id: <20220705115615.886314240@linuxfoundation.org>
Date: Tue, 5 Jul 2022 13:57:42 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Enguerrand de Ribaucourt
<enguerrand.de-ribaucourt@...oirfairelinux.com>,
Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.10 19/84] net: dp83822: disable false carrier interrupt
From: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>
commit c96614eeab663646f57f67aa591e015abd8bd0ba upstream.
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.
Fixes: 87461f7a58ab ("net: phy: DP83822 initial driver submission")
Signed-off-by: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/net/phy/dp83822.c | 1 -
1 file changed, 1 deletion(-)
--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -244,7 +244,6 @@ static int dp83822_config_intr(struct ph
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);
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