mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-08-28 05:14:41 -04:00
5ba017f9ef
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. Classify PSGMII alongside SGMII and QSGMII as INBAND_CISCO_SGMII so the PCS negotiates in-band and the resolved link speed comes from the PHY in-band word. Also add PSGMII to the generic clause 22 PCS helper functions which handle the SGMII in-band word. Without this, a PCS using these helpers would still fall through to the default handling and force the link state to false in phylink_mii_c22_pcs_decode_state(), fail to encode the SGMII advertisement, and get rejected by phylink_get_link_timer_ns(). Signed-off-by: Sandeep Sondagar <sandeepsondagar@gmail.com> Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de> Link: https://patch.msgid.link/20260809-phylink-psgmii-v3-1-908dcd3a9e3d@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>