net: dsa: mv88e6xxx: wait after reset deactivation

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>
mariux64 · Jun 29, 2019 · 7b75e49 · 7b75e49
1 parent 3c91f25
commit 7b75e49
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -4711,6 +4711,8 @@ 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)