linux-kernel - Re: [PATCH net-next v2 3/4] net: macb: Enable queue disable and WOL

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Message-ID: <bee77573-b714-4889-9f80-1b3b27ffda63@amd.com>
Date: Tue, 5 Mar 2024 20:15:30 +0530
From: "Karumanchi, Vineeth" <vineeth.karumanchi@....com>
To: Andrew Lunn <andrew@...n.ch>
Cc: nicolas.ferre@...rochip.com, claudiu.beznea@...on.dev,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, linux@...linux.org.uk, vadim.fedorenko@...ux.dev,
 netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, git@....com
Subject: Re: [PATCH net-next v2 3/4] net: macb: Enable queue disable and WOL

Hi Andrew,

On 2/27/2024 10:34 AM, Karumanchi, Vineeth wrote:
> Hi Andrew,
> 
> On 2/23/2024 6:56 PM, Andrew Lunn wrote:
>>> It is not specific to AMD versions. All Cadence GEM IP versions have the
>>> capability, but specific vendors might enable or disable it as per their
>>> requirements.
>>
>> Do you mean it is an option to synthesizer it or not? So although the
>> basic IP licensed from Cadence has it, a silicon vendor could remove
>> it?
>>
> 
> Regarding that, we are unsure. However, based on observation from all 
> previous cadence IP's in AMD Soc's, this feature was available.
> 
>>> WOL was previously enabled via the device-tree attribute. Some users 
>>> might
>>> not leverage it.
>>
>> This is not typical. If the hardware supports it, we let the end user
>> decided if they want to use it or not.
>>
>> So if all silicon should have it, enable it everywhere. If there is an
>> option to save some gates and leave it out of the silicon, then we do
>> need some per device knowledge, or a register which tells us what the
>> synthesis options where.
>>
> 
> I have looked into all config_debug* registers of multiple versions 
> available with us and there is no mention of WOL. I think we can add 
> MACB_WOL_CAPS to default_config and advertise in ethtool by default.
> 
> Please let me know your suggestions/thoughts.


Adding WOL caps to default_gem_config is not effective.
The individual config is overriding default_config.

I only see enabling WOL by default,
- By default, Advertise magic-packet and ARP in ethtool.
- Always set device_set_wakeup_capable to true.
- "magic-packet" property is no longer useful.

Please let me know your suggestions.

-- 
🙏 vineeth