linux-kernel - Re: [PATCH v2] net: cpsw: fix obtaining mac address for am3517

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Message-ID: <de546232-0638-318a-535f-169184933a20@victronenergy.com>
Date:   Fri, 23 Jun 2023 23:13:22 +0200
From:   Jeroen Hofstee <jhofstee@...tronenergy.com>
To:     Simon Horman <simon.horman@...igine.com>,
        Måns Rullgård <mans@...sr.com>
Cc:     Tony Lindgren <tony@...mide.com>, netdev@...r.kernel.org,
        Mugunthan V N <mugunthanvnm@...com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "open list:TI ETHERNET SWITCH DRIVER (CPSW)" 
        <linux-omap@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] net: cpsw: fix obtaining mac address for am3517


On 23-06-2023 22:14, Simon Horman wrote:
> On Fri, Jun 23, 2023 at 03:58:03PM +0100, Måns Rullgård wrote:
>> Tony Lindgren <tony@...mide.com> writes:
>>
>>> * Jeroen Hofstee <jhofstee@...tronenergy.com> [161028 11:19]:
>>>> Hello Tony,
>>>>
>>>> On 28-10-16 17:52, Tony Lindgren wrote:
>>>>> * Jeroen Hofstee <jhofstee@...tronenergy.com> [161028 08:33]:
>>>>>> Commit b6745f6e4e63 ("drivers: net: cpsw: davinci_emac: move reading mac
>>>>>> id to common file") did not only move the code for an am3517, it also
>>>>>> added the slave parameter, resulting in an invalid (all zero) mac address
>>>>>> being returned for an am3517, since it only has a single emac and the slave
>>>>>> parameter is pointing to the second. So simply always read the first and
>>>>>> valid mac-address for a ti,am3517-emac.
>>>>> And others davinci_emac.c users can have more than one. So is the
>>>>> reason the slave parameter points to the second instance because
>>>>> of the location in the hardware?
>>>> Sort of, the slave parameter gets determined by the fact if there is one
>>>> or two register range(s) associated with the davinci_emac. In davinci_emac.c
>>>>
>>>>      res_ctrl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>>>>      ...
>>>>      rc = davinci_emac_try_get_mac(pdev, res_ctrl ? 0 : 1,
>>>>                            priv->mac_addr);
>>>>
>>>> So it there are two ranges, the slave param becomes 0. It there is only one,
>>>> it
>>>> will be 1. Since the am3517 only has a single regs entry it ends up with
>>>> slave 1,
>>>> while there is only a single davinci_emac.
>>> OK thanks for clarifying it:
>>>
>>> Acked-by: Tony Lindgren <tony@...mide.com>
>> Is there some reason this patch was never picked up, or was it simply
>> forgotten?
> I feel like I am missing something here.

That is a weird response, you feel like something is missing, while
it is a recognized bug, acknowledged by the maintainer at that time
and apparently still not fixed and Måns simply asked it there is a
reason for that.

This is not a really helpful response,

Jeroen