netdev - Re: [PATCH] net: phy: smsc: Re-enable EDPD mode for LAN87xx

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Date:	Thu, 15 Nov 2012 17:49:10 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	patrick.trantham@...l7.com
Cc:	netdev@...r.kernel.org, steve.glendinning@...well.net,
	otavio@...ystems.com.br, marex@...x.de, chohnstaedt@...ominate.com,
	jkosina@...e.cz
Subject: Re: [PATCH] net: phy: smsc: Re-enable EDPD mode for LAN87xx

From: Patrick Trantham <patrick.trantham@...l7.com>
Date: Thu, 15 Nov 2012 13:00:57 -0600

> This patch re-enables Energy Detect Power Down (EDPD) mode for the
> LAN8710/LAN8720.  EDPD mode was disabled in a previous commit,
> (b629820d18fa65cc598390e4b9712fd5f83ee693), because it was causing the
> PHY to not be able to detect a link when cold started without a cable
> connected.
> 
> The LAN8710/LAN8720 requires a minimum of 2 link pulses within 64ms of
> each other in order to set the ENERGYON bit and exit EDPD mode.  If a
> link partner does send the pulses within this interval, the PHY will
> remained powered down.
> 
> This workaround will manually toggle the PHY on/off upon calls to
> read_status in order to generate link test pulses if the link is down.
> If a link partner is present, it will respond to the pulses, which will
> cause the ENERGYON bit to be set and will cause the EDPD mode to be
> exited.
> 
> Signed-off-by: Patrick Trantham <patrick.trantham@...l7.com>

Applied to net-next, thanks.
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