netdev - Re: [PATCH] net: fec: setup right value for mdio hold time

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Message-Id: <20150329.134101.916097441015561162.davem@davemloft.net>
Date:	Sun, 29 Mar 2015 13:41:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	u.kleine-koenig@...gutronix.de
Cc:	rmk+kernel@....linux.org.uk, Frank.Li@...escale.com,
	LW@...O-electronics.de, fabio.estevam@...escale.com,
	kernel@...gutronix.de, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: fec: setup right value for mdio hold time

From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Date: Fri, 27 Mar 2015 11:08:32 +0100

> The FEC modules used on i.MX28 and newer have a register to tune the MDIO
> output hold time that should be at least 10 ns. Up to now this value was not
> explicitly set and so resulted in less hold time if the fec clock was
> faster than 100 MHz.
> 
> This was noticed on an i.MX28 machine that uses an input clock of ~150
> Mhz which resulted in unreliable communication with a Marvell switch.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Applied.
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