Re: [PATCH] net: cpsw: fix obtaining mac address for am3517

Re: [PATCH] net: cpsw: fix obtaining mac address for am3517

[Tony Lindgren]

* Jeroen Hofstee <jhofstee@victronenergy.com> [161020 12:57]:
> 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 a invalid (all zero) mac address
> being returned. So change it back to always read from slave zero, so it
> works again.

Hmm doesn't this now break it for cpsw with two instances? We may need
am3517 specific quirk flag instead?

Regards,

Tony

Re: [PATCH] net: cpsw: fix obtaining mac address for am3517

[Jeroen Hofstee]

Hello Tony,

On 21-10-16 08:38, Tony Lindgren wrote:
> * Jeroen Hofstee <jhofstee@victronenergy.com> [161020 12:57]:
>> 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 a invalid (all zero) mac address
>> being returned. So change it back to always read from slave zero, so it
>> works again.
> Hmm doesn't this now break it for cpsw with two instances?
>

Yes, well, they get the same mac address at least. But does it matter?
This changes davinci_emac_3517_get_macid, the only way to get there
is:

     if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
         return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr)

and the only user of ti,am3517-emac is arch/arm/boot/dts/am3517.dtsi,
which only has one emac. So the change is already am3517 specific.

> We may need am3517 specific quirk flag instead?

Given above, it is already am3517 specific. Let me know if you prefer this
route then I will have a look at it.

Regards,
Jeroen

Re: [PATCH] net: cpsw: fix obtaining mac address for am3517

[Tony Lindgren]

* Jeroen Hofstee <jhofstee@victronenergy.com> [161021 00:37]:
> Hello Tony,
> 
> On 21-10-16 08:38, Tony Lindgren wrote:
> > * Jeroen Hofstee <jhofstee@victronenergy.com> [161020 12:57]:
> > > 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 a invalid (all zero) mac address
> > > being returned. So change it back to always read from slave zero, so it
> > > works again.
> > Hmm doesn't this now break it for cpsw with two instances?
> > 
> 
> Yes, well, they get the same mac address at least. But does it matter?
> This changes davinci_emac_3517_get_macid, the only way to get there
> is:
> 
>     if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
>         return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr)
> 
> and the only user of ti,am3517-emac is arch/arm/boot/dts/am3517.dtsi,
> which only has one emac. So the change is already am3517 specific.
> 
> > We may need am3517 specific quirk flag instead?
> 
> Given above, it is already am3517 specific. Let me know if you prefer this
> route then I will have a look at it.

Oh OK thanks for explaining it :) As it's already am3517 specific:

Acked-by: Tony Lindgren <tony@atomide.com>

Re: [PATCH] net: cpsw: fix obtaining mac address for am3517

[Jeroen Hofstee]

Hello Tony,


On 21-10-16 09:53, Tony Lindgren wrote:
> * Jeroen Hofstee <jhofstee@victronenergy.com> [161021 00:37]:
>> Hello Tony,
>>
>> On 21-10-16 08:38, Tony Lindgren wrote:
>>> * Jeroen Hofstee <jhofstee@victronenergy.com> [161020 12:57]:
>>>> 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 a invalid (all zero) mac address
>>>> being returned. So change it back to always read from slave zero, so it
>>>> works again.
>>> Hmm doesn't this now break it for cpsw with two instances?
>>>
>> Yes, well, they get the same mac address at least. But does it matter?
>> This changes davinci_emac_3517_get_macid, the only way to get there
>> is:
>>
>>      if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
>>          return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr)
>>
>> and the only user of ti,am3517-emac is arch/arm/boot/dts/am3517.dtsi,
>> which only has one emac. So the change is already am3517 specific.
>>
>>> We may need am3517 specific quirk flag instead?
>> Given above, it is already am3517 specific. Let me know if you prefer this
>> route then I will have a look at it.
> Oh OK thanks for explaining it :) As it's already am3517 specific:
>
> Acked-by: Tony Lindgren <tony@atomide.com>

Aaah, lets wait a sec. I just saw there is another user of this function,
so above is simply not true....

     if (of_machine_is_compatible("ti,dra7"))
         return davinci_emac_3517_get_macid(dev, 0x514, slave, mac_addr);


So let me check if I don't break that one..... or better, let me send a 
v2, which
changes the caller to pass slave as 0 here?

     if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
         return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr);

Regards,
Jeroen

Re: [PATCH] net: cpsw: fix obtaining mac address for am3517

[Tony Lindgren]

* Jeroen Hofstee <jhofstee@victronenergy.com> [161021 02:31]:
> Aaah, lets wait a sec. I just saw there is another user of this function,
> so above is simply not true....
> 
>     if (of_machine_is_compatible("ti,dra7"))
>         return davinci_emac_3517_get_macid(dev, 0x514, slave, mac_addr);

Oh OK, then this will produce duplicate macs.

> So let me check if I don't break that one..... or better, let me send a v2,
> which
> changes the caller to pass slave as 0 here?
> 
>     if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
>         return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr);
> 

Yeah that sounds good to me.

Regards,

Tony