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    Subject[PATCH 4.9 135/223] net: dsa: mv88e6xxx: wait after reset deactivation
    Date
    From: Baruch Siach <baruch@tkos.co.il>

    [ 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>
    ---
    drivers/net/dsa/mv88e6xxx/chip.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/net/dsa/mv88e6xxx/chip.c
    +++ b/drivers/net/dsa/mv88e6xxx/chip.c
    @@ -3846,6 +3846,8 @@ static int mv88e6xxx_probe(struct mdio_d
    mv88e6xxx_mdio_unregister(chip);
    return err;
    }
    + if (chip->reset)
    + usleep_range(1000, 2000);

    return 0;
    }

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