linux-kernel - Re: [PATCH regression] net: phy: fix initialization (config

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Date:	Wed, 02 Apr 2014 22:25:02 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>,
	Alexander Holler <holler@...oftware.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Michal Simek <michal.simek@...inx.com>,
	stable <stable@...r.kernel.org>
Subject: Re: [PATCH regression] net: phy: fix initialization (config_init)
 for Marvel 88E1116R PHYs

On 04/02/2014 09:01 PM, Florian Fainelli wrote:
> 2014-04-02 2:09 GMT-07:00 Alexander Holler <holler@...oftware.de>:
>> Am 02.04.2014 02:57, schrieb Florian Fainelli:
>>> 2014-04-01 16:55 GMT-07:00 Alexander Holler <holler@...oftware.de>:
>>>> Commit 7cd1463664c2a15721ff4ccfb61d4d970815cb3d (introduced with 3.14)
>>>> changed the initialization of the mv643xx_eth driver to use phy_init_hw()
>>>> to reset the PHY. Unfortunately the initialization for the 88E1116R PHY
>>>> was broken such, that it used mdelay() instead of really waiting for a
>>>> reset to finish.
>
> Can you resubmit with the following information:
> 
> - you specify the commit that introduce the problem in parenthesis,
> e.g: deadbeef ("dead: beef: cafe babe")
> - put this dmesg snippet in your log message to clearly illustrate
> what is happening
> - clarify that the PHY needs to be polled in a comment in
> m88e1116r_config_init()
> 
> Meanwhile, it would be good if someone with access to this particular
> PHY datasheet could look for known erratas, problems, non-standard
> compliant behavior ....

Alexander,

I tried todays linux/master on Seagate Dockstar with Marvell 88E1116R
(0x01410e40) and cannot reproduce any regression. I tried booting from
tftp and usb, I also rebooted twice to see if there are any side
effects - nothing - ethernet always comes up as expected.

I am curious, how you determined above commit to be the cause of the
regression you are seeing. Can you bisect, if you didn't already?

Sebastian
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