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

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Date: Tue, 27 Feb 2024 10:34:28 +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 2/23/2024 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.
-- 
🙏 vineeth