netdev - Re: Davicom DM9000A regression

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Message-ID: <20130612212306.GA21234@electric-eye.fr.zoreil.com>
Date:	Wed, 12 Jun 2013 23:23:06 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Nikita Kiryanov <nikita@...pulab.co.il>
Cc:	netdev@...r.kernel.org, josright123@...il.com
Subject: Re: Davicom DM9000A regression

Nikita Kiryanov <nikita@...pulab.co.il> :
[...]
> A bit of digging revealed the cause as this patch:
> "DM9000B: driver initialization upgrade"

(aka 6741f40d198c6a5feb23653a1efd4ca47f93d83d)

> and specifically, the following line that was added by it:
> dm9000_phy_write(dev, 0, MII_BMCR, BMCR_RESET); /* PHY RESET */
> (uncommenting this line solves the problem).
> Adding a delay after the phy reset did not help.

(I have no idea why Davicom enforced a dsp phy register write everywhere
instead of using db->type to identify the specific chipset revision that
requires it)

The last version of the patch changed - not much - without notice and
it did not contain the "tested on DM9000{A, B, E}, x86, arm" part.

You may try http://marc.info/?l=linux-netdev&m=136443908225335 to
see if it behaves the same.

-- 
Ueimor
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