netdev - Re: Freescale FEC packet loss

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Date:	Sun, 26 Jan 2014 18:56:30 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Marek Vasut <marex@...x.de>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Frank Li <Frank.Li@...escale.com>, fugang.duan@...escale.com,
	"fabio.estevam@...escale.com" <fabio.estevam@...escale.com>,
	Hector Palacios <hector.palacios@...i.com>,
	linux-arm-kernel@...ts.infradead.org, Detlev Zundel <dzu@...x.de>,
	Eric Nelson <eric.nelson@...ndarydevices.com>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: Freescale FEC packet loss

On Wed, 2014-01-22 at 22:55 +0100, Marek Vasut wrote:
> Hi guys,
> 
> I am running stock Linux 3.13 on i.MX6Q SabreLite board. The CPU is i.MX6Q TO 
> 1.0 .
> 
> I am hitting a WARNING when I use the FEC ethernet to transfer data, thus I 
> started investigating this problem. TL;DR I am not able to figure this problem 
> out, so I am not attaching a patch :-(
> 
> Steps to reproduce:
> -------------------
> 1) Boot stock Linux 3.13 on i.MX6Q SabreLite board
> 2) Plug in an SD card into one of the SD slots (I use the full-size one)
> 3) Plug in an USB stick into one of the USB ports (I use the upper one)
> 4) Plug in an ethernet cable into the board
>    -> Connect the other side into a gigabit-capable PC
[...]

I think there are known problems with 1000BASE-T on the Sabre Lite
board.  Two possible workarounds are to limit the PHY to 100BASE-TX
(should be doable with ethtool) or force it to be clock master for
1000BASE-T (requires a driver patch).  The vendor kernel apparently does
both!  Matthew Garrett has been trying to implement a workaround in a
clean way.

Ben.

-- 
Ben Hutchings
If the facts do not conform to your theory, they must be disposed of.

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