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: v5.1.21~55
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b2e53dfcb599ecdaa3db1a2e7d5bef9bacd5502;p=thirdparty%2Fkernel%2Fstable.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 ae750ab9a4d7f..5f81d9a3a2a69 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -4910,6 +4910,8 @@ 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)