net: dsa: mv88e6xxx: wait after reset deactivation

[ Upstream commit 7b75e49 ] 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 <[email protected]> Reviewed-by: Andrew Lunn <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
hardkernel · Aug 4, 2019 · 4f6e4d1 · 4f6e4d1
1 parent 1a94807
commit 4f6e4d1
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
@@ -3846,6 +3846,8 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
 		mv88e6xxx_mdio_unregister(chip);
 		return err;
 	}
+	if (chip->reset)
+		usleep_range(1000, 2000);
 
 	return 0;
 }