On Thu, Apr 17, 2025 at 04:10:31AM +0200, Aleksandrs Vinarskis wrote: > Recently added Initial LTTPR support in msm/dp has configured LTTPR(s) > to non-transparent mode to enable video output on X1E-based devices > that come with LTTPR on the motherboards. However, video would not work > if additional LTTPR(s) are present between sink and source, which is > the case for USB Type-C docks (eg. Dell WD19TB/WD22TB4), and at least > some universal Thunderbolt/USB Type-C monitors (eg. Dell U2725QE).
Does this mean that the incomplete LTTPR support in 6.15-rc1 broke adapters or docks with retimers in transparent mode? You describe at least one of this patches as a fix but I'm not seeing any Fixes tags or indication that these need to go into 6.15-rc to fix a regression. > Changes in v3: > - Split 1st patch into 3 > - Simplified handling of max_lttpr_lanes/max_lttpr_rate > - Moved lttpr_common_caps to msm_dp_link (not msm_dp_panel, as LTTPRs > are link related, not panel related) > - Picked Stefan's T-b tag (last patch only, as 1st one is getting split) > - Droped Abel's R-b tags from 1st patch that got split due to high diff > - Fixed alignment issues, initialization of variables, debug prints > - Moved lttpr_count to avoid ugly pointer > - Link to v2: > https://lore.kernel.org/all/20250311234109.136510-1-alex.vinars...@gmail.com/ I tested v2 due to the dependencies in msm-next and DP altmode still works on my X13s and T14s (while not using any docks): Tested-by: Johan Hovold <johan+lin...@kernel.org> > Aleksandrs Vinarskis (4): > drm/msm/dp: Fix support of LTTPR initialization > drm/msm/dp: Account for LTTPRs capabilities > drm/msm/dp: Prepare for link training per-segment for LTTPRs > drm/msm/dp: Introduce link training per-segment for LTTPRs Johan
