linux-kernel - Re: [PATCH 08/18] net: dsa: mv88e6xxx: Add Hardware bridging support

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Message-ID: <550F460F.8060705@roeck-us.net>
Date:	Sun, 22 Mar 2015 15:45:35 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	David Miller <davem@...emloft.net>, andrew@...n.ch
CC:	netdev@...r.kernel.org, f.fainelli@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/18] net: dsa: mv88e6xxx: Add Hardware bridging support

On 03/22/2015 03:24 PM, David Miller wrote:
> From: Andrew Lunn <andrew@...n.ch>
> Date: Sun, 22 Mar 2015 21:06:00 +0100
>
>> Hi Guenter
>>
>>> +static int _mv88e6xxx_atu_cmd(struct dsa_switch *ds, int fid, u16 cmd)
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, 0x01, fid);
>>> +	if (ret < 0)
>>> +		return ret;
>>
>> Please could you check this. I think register 0x01 here is wrong. I
>> think you want 0x0b, the ATU Operations register?
>
> Just want to mention that register mnenomics would have made this
> bug more obvious :-)
>

Andrew is working on introducing those definitions, which is how he
found the problem. It is not a bug per se, though, since the register
definition changed across chip generations. The code works fine for
the chips we tested it with (6171, 6172, and 6352).

Guenter

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