netdev - [RFC] net/fs_enet: send a reset request to the PHY on init

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Date:	Wed, 2 Sep 2009 13:04:10 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Pantelis Antoniou <pantelis.antoniou@...il.com>,
	Vitaly Bordug <vbordug@...mvista.com>
Cc:	linuxppc-dev@...abs.org, netdev@...r.kernel.org
Subject: [RFC] net/fs_enet: send a reset request to the PHY on init

Usually u-boot sends a phy request in its network init routine. An uboot
without network support doesn't do it and I endup without working
network. I still can switch between 10/100Mbit (according to the LED on
the hub and phy registers) but I can't send or receive any data.

At this point I'm not sure if the PowerON Reset takes the PHY a few
nsecs too early out of reset or if this reset is required and everyone
relies on U-boot performing this reset.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
This is done on a custom mpc512x board. Unfortunately I don't have other
boards to check. The PHY is a AMD Am79C874, phylib uses the generic one.

 drivers/net/fs_enet/fs_enet-main.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
index ee15402..a3c962b 100644
--- a/drivers/net/fs_enet/fs_enet-main.c
+++ b/drivers/net/fs_enet/fs_enet-main.c
@@ -823,7 +823,8 @@ static int fs_init_phy(struct net_device *dev)
 	}
 
 	fep->phydev = phydev;
-
+	phy_write(phydev, MII_BMCR, BMCR_RESET);
+	udelay(1);
 	return 0;
 }
 
-- 
1.6.4.GIT

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