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net: dsa: mv88e6xxx: wait after reset deactivation

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[ Upstream commit 7b75e49de424ceb53d13e60f35d0a73765626fda ]

Add a 1ms delay after reset deactivation. Otherwise the chip returns
bogus ID value. This is observed with 88E6390 (Peridot) chip.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baruch Siach 2019-06-27 21:17:39 +03:00 committed by Greg Kroah-Hartman
parent 5832ef4afd
commit 6ab30a4cc5
1 changed files with 2 additions and 0 deletions
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2
drivers/net/dsa/mv88e6xxx/chip.c
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@ -4816,6 +4816,8 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
err = PTR_ERR(chip->reset);
goto out;
}
if (chip->reset)
usleep_range(1000, 2000);
err = mv88e6xxx_detect(chip);
if (err)