linux-kernel - [RFT] sky2: yukon-ec-u phy power problems

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Message-ID: <20070821100713.2867dce3@freepuppy.rosehill.hemminger.net>
Date:	Tue, 21 Aug 2007 10:07:13 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Kevin E <kevin360@...oo.com>
Cc:	Willy Tarreau <w@....eu>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [RFT] sky2: yukon-ec-u phy power problems

The sky2 driver clears some bits in the PHY control register, that cause
the PHY interface to get changed.  Some of these deal with voltage and power
savings as well. This may explain some of the failures on Gigabyte DS-3 motherboard.

The clue to possible problem was looking at why loading/unloading sky2 would
break vendor sk98lin driver (ie what registers changed).


--- a/drivers/net/sky2.c	2007-08-21 09:53:41.000000000 -0700
+++ b/drivers/net/sky2.c	2007-08-21 09:53:43.000000000 -0700
@@ -696,8 +696,8 @@ static void sky2_mac_init(struct sky2_hw
 	int i;
 	const u8 *addr = hw->dev[port]->dev_addr;
 
-	sky2_write32(hw, SK_REG(port, GPHY_CTRL), GPC_RST_SET);
-	sky2_write32(hw, SK_REG(port, GPHY_CTRL), GPC_RST_CLR);
+	sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_SET);
+	sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_CLR);
 
 	sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_RST_CLR);
 
-
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