Re: [PATCH net v3] net: phylink: treat PSGMII as an inband capable interface

[Nicolai Buchwitz]

Hi Sandeep,

On 9.8.2026 18:01, Sandeep Sondagar wrote:
> PSGMII (the Qualcomm 5-port SGMII) conveys the link negotiation result
> from the PHY back to the MAC through per-channel in-band SGMII words,
> exactly like SGMII and QSGMII.
>
> However, PHY_INTERFACE_MODE_PSGMII is missing from
> phylink_get_inband_type(), so phylink reports INBAND_NONE for it and
> phylink_pcs_neg_mode() falls back to PHYLINK_PCS_NEG_NONE. The PCS is
> then programmed in force mode and its control-register speed bits 
> (which
> default to 1000base) are used, so a slower copper link - e.g. 100base-T
> - is reported as 1Gbps and cannot pass traffic.

Out of curiosity: How has this been noticed (eg. which board / 
platform)?

> [...]

Reviewed-by: Nicolai Buchwitz <nb@xxxxxxxxxxx>

Thanks,
Nicolai