Re: [PATCH 2/5] usb: typec: ps883x: Return -EOPNOTSUPP for USB4 when parade,disable-usb4 is set
From: Jens Glathe
Date: Wed Jul 22 2026 - 04:54:15 EST
Hi,
On 7/21/26 19:57, Dmitry Baryshkov wrote:
On Sat, Jul 18, 2026 at 07:06:30PM +0200, Jens Glathe via B4 Relay wrote:AFAIU, no. USB4 has some tunneling protocol for DP altmode, not dedicated lanes. Therefore you need to either support that or enforce USB3 DP altmode negotiation. The role-switch on the qmmphy would be too late IMO.
From: Jens Glathe <jens.glathe@xxxxxxxxxxxxxxxxxxxxxx>Would it be enough to make QMP combo PHY to treat USB4 as USB3+DP for
On Qualcomm X1E80100 platforms using the Parade PS883x retimer (like
Lenovo ThinkPad T14s Gen6), hotplugging USB4-capable docks such as the
Lenovo 40B0 results in working USB but no DisplayPort output on the
dock's HDMI/DP ports.
When the dock negotiates USB4, the retimer receives TYPEC_MODE_USB4
and forwards it via typec_mux_set(). The qmp_combo PHY then selects
QMPPHY_MODE_USB3_ONLY because no classic DP altmode SVID is present in
the state, leaving the DP transmitter and AUX channel disabled.
the sake of this issue?
with best regards
Jens