Re: [PATCH net-next] r8169: allow Giga Lite fallback on RTL8168EP

[Heiner Kallweit]

On 12.10.2026 16:53, Hee-Suk Kim wrote:
> Daniel Golle <daniel@xxxxxxxxxxxxxx> writes:
> 
>> On Mon, Oct 12, 2026 at 02:46:27PM +0200, Andrew Lunn wrote:
>>> Please add ETHTOOL_LINK_MODE_500baseT2_Full. Make the PHY report this
>>> link mode in it features, add the speed, allow it to be negotiated,
>>> reported in ethtool etc.
> 
> Will do in v2.
> 
>> While at it also consider ETHTOOL_LINK_MODE_1000baseT2_Full which is
>> supported as "2.5G Lite" by the RTL8221/RTL8226 2.5G PHY family.
> 
> Happy to add it as well, but I'd need to know what PHYSR reports for a
> 2.5G Lite link on those PHYs, as I can't test it myself. Do you happen
> to know?
> 
Also the needed register configuration may be different. Would be helpful to get advise
from Javen/Realtek on:
- Which lite modes exist?
- Which chip versions support which lite modes?
- What is the needed configuration per lite mode (according to vendor drivers the config may
  be different per advertised speeds)

I can't tell as I have no access to Realtek documentation.

> Thanks,
> hsk