From: Baruch Siach <baruch@tkos.co.il>
Date: Thu, 27 Jun 2019 18:17:39 +0000 (+0300)
Subject: net: dsa: mv88e6xxx: wait after reset deactivation
X-Git-Tag: v4.9.187~89
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4f6e4d1e03a442fad80c1fc1e62d9d27518ecffe;p=platform%2Fkernel%2Flinux-amlogic.git

net: dsa: mv88e6xxx: wait after reset deactivation

[ 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>
---

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 2edd193c96ab..f157b81551b7 100644
--- 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;
 }