netdev - Re: Phy read timeout in ibm_new

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Date:	Wed, 23 Apr 2008 07:06:31 +0200
From:	Markus Brunner <super.firetwister@...glemail.com>
To:	benh@...nel.crashing.org
Cc:	netdev@...r.kernel.org, ppc-dev <linuxppc-dev@...abs.org>
Subject: Re: Phy read timeout in ibm_new_emac driver

On Wednesday 16 April 2008, Benjamin Herrenschmidt wrote:

> Somebody knows off hand what the standard says the timeout should be ?

Anyone?

I didn't find any documentation on the standard, but I had a look at other 
drivers. 
au1000_eth.c waits 20 ms (20 * 1ms) in mdio_read.
bfin_mac.c waits 500 * 1us in mdio_poll. 
In both functions the last delay before the timeout is useless, like in 
new_emac. Not nice, but timeouts shouldn't occur anyway.

new emac probably doesn't wait long enough, but 20ms seems to be a bit too 
long.

Regards
Markus
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