From: David Miller <davem@davemloft.net>
To: javier@dowhile0.org
Cc: steve.glendinning@smsc.com, eballetbo@iseebcn.com,
ben@decadent.org.uk, netdev@vger.kernel.org
Subject: Re: [PATCH v2 2/2] net/smsc911x: Check if PHY is in operational mode before software reset
Date: Tue, 03 Jan 2012 20:24:33 -0500 (EST) [thread overview]
Message-ID: <20120103.202433.812126500710199359.davem@davemloft.net> (raw)
In-Reply-To: <1325633779-6159-2-git-send-email-javier@dowhile0.org>
From: Javier Martinez Canillas <javier@dowhile0.org>
Date: Wed, 4 Jan 2012 00:36:19 +0100
> SMSC LAN generation 4 chips integrate an IEEE 802.3 ethernet physical layer.
> The PHY driver for this integrated chip enable an energy detect power-down mode.
> When the PHY is in a power-down mode, it prevents the MAC portion chip to be
> software reseted.
>
> That means that if we compile the kernel with the configuration option SMSC_PHY
> enabled and try to bring the network interface up without an cable plug-ed the
> PHY will be in a low power mode and the software reset will fail returning -EIO
> to user-space:
>
> root@igep00x0:~# ifconfig eth0 up
> ifconfig: SIOCSIFFLAGS: Input/output error
>
> This patch disable the energy detect power-down mode before trying to software
> reset the LAN chip and re-enables after it was reseted successfully.
>
> Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org>
Applied.
next prev parent reply other threads:[~2012-01-04 1:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-03 23:36 [PATCH v2 1/2] net: phy: smsc: Move SMSC PHY constants to <linux/smscphy.h> Javier Martinez Canillas
2012-01-03 23:36 ` [PATCH v2 2/2] net/smsc911x: Check if PHY is in operational mode before software reset Javier Martinez Canillas
2012-01-04 1:24 ` David Miller [this message]
2012-01-04 1:24 ` [PATCH v2 1/2] net: phy: smsc: Move SMSC PHY constants to <linux/smscphy.h> David Miller
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