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| author | Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@savoirfairelinux.com> | 2022-06-23 15:46:44 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-06-24 16:32:34 -0700 |
| commit | c96614eeab663646f57f67aa591e015abd8bd0ba (patch) | |
| tree | e605e4d179f125cca9dd0a67ea013b41e291b705 /drivers | |
| parent | 3b9bc84d311104906d2b4995a9a02d7b7ddab2db (diff) | |
| download | linux-stable-c96614eeab663646f57f67aa591e015abd8bd0ba.tar.gz linux-stable-c96614eeab663646f57f67aa591e015abd8bd0ba.tar.bz2 linux-stable-c96614eeab663646f57f67aa591e015abd8bd0ba.zip | |
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.
Fixes: 87461f7a58ab ("net: phy: DP83822 initial driver submission")
Signed-off-by: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/phy/dp83822.c | 1 |
1 files changed, 0 insertions, 1 deletions
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); |